Device for receiving quadruple-encoded series

FIELD: radio engineering, possible use in fiber-optic communication systems.

SUBSTANCE: device has commutator, k-1 delay blocks, branch device, multi-branch delay line, k-1 transformers of pulse series, law-setting block, block for processing optical signal and solving block.

EFFECT: increased resistance to interference or increased length of regeneration portion of fiber-optic communication line.

3 cl, 6 dwg

 

The invention relates to quantum electronics and optical communication and can be used in optical fibre communication systems as receive discrete data and synchronization.

The known device described in article Roland Wilson and John Richter "Generation and Performance of Quadraphase Welti Codes for Radar and Synchronization of Coherent and Differentially Coherent PSK" // IEEE Transactions on Communications, 1979, September, - v.COM-27, No. 9, - p.1296-1301, fig.4, consists of a generator of the reference oscillation, the phase shifterfirst and second multiplier products, the first and second bandpass filters, myCitadel, the threshold device, a casting block and k is identical stages (where N=2k- the number of elements in the Quaternary-coded sequence; k≥2 integer), each of which includes sakasamouse block, delay time 2k-lτ (where τ -the duration of a single element taken Quaternary-coded sequence) and the cell summation-subtraction, and carries out processing of complex signals with a relative phase shift keying codes Welty.

The disadvantage of this device is the lack of possibility of application of the relative phase-shift keying (there), as in the processing of the Quaternary-coded sequence from there when the time shifts of the elements of the Quaternary-coded sequence is arusaada mutually correlation properties, as well as the impossibility of its application for processing optical signals in fiber-optic communication systems, which limits the scope of application of this device for receiving the Quaternary-coded sequences.

The known device described in article WAV, Eventclose "Formation and processing of complex signals with quadrature shift keying codes Welty" // Radiotekhnika, 1994, No. 10, - pp.61-65, figure 2, consists of an optimal filter for a single signal, the first and second multiplier and k are identical stages, each of which includes a delay line at time 2k-lτ and the cell summation-subtraction, and carries out processing of complex signals with quadrature shift keying codes Welty.

The disadvantage of this device is the lack of coherent convolution Quaternary-coded sequence, and the impossibility of its application for processing optical signals in fiber-optic communication systems, which limits the scope of application of this device for receiving the Quaternary-coded sequences.

The closest in technical essence and functionality of the claimed device analogue (prototype), is a device for receiving the Quaternary-coded sequences (see avts No. 1721837 the USSR, IPC7 H 04 L 27/26, Appl. 08.01.90, publ. 23.03.92. Bull. No. 11). The known device comprises a demodulator, multi-tap delay line, the switch, k-1 delay blocks, k-1 converters pulse sequence, sakasamouse block, myCitadel and decisive block, each of the delay blocks contains myCitadel, delay element and the switch, and each of the converters pulse sequence contains sakasamouse unit and an adder.

The device for receiving the Quaternary-coded sequences contains serially connected multi-tap delay line, the switch, k-1 delay blocks, myCitadel and a crucial block. K - output multi-tap delay line connected to the corresponding k - inputs of the switch. In addition, the device also contains a serial connected k-1 converters pulse sequence and sakasamouse block, the output of which is connected to the second information input myCitadel. The second information output and the second information input of each delay unit, respectively, are the second information input and the first information output of the corresponding inverter pulse sequence. Each delay unit is made in the form of series-connected myCitadel, delay elements and switches. Moreover, the first information input vicites respectively is the first information input and the second information output of the delay block. The second information input myCitadel is the second information input of the delay block. The second information output of delay element connected to the second information input of the switch, the output of which is the first informationm output of the delay block. Installation inputs of the switch blocks and delays that are setup inputs of the switches are the second mounting the device inputs. Each transducer pulse sequence is executed in the form of series-connected sakasegawa unit and an adder. Entrance sakasegawa block is the first information input of the Converter pulse sequence. Output sakasegawa unit, respectively, is the first information input of the adder and the first information output pulse sequence. The second information input and the output of the adder are respectively the second information input and the second information output pulse sequence. Installation inputs converters pulse sequences that are setup inputs sakasegawa blocks, as well as the installation log sakasegawa block are the first installation the device inputs. The input of the demodulator is input from the trojstva, and the first and second information outputs of the demodulator respectively connected to the input tap of the delay line and to the first information input of the first inverter pulse sequence. The yield of the final block is the output device.

The device for receiving the Quaternary-coded sequence, the prototype performs the processing of complex signals with Quaternary phase shift keying (FM-4), where the odd and even elements in the Quaternary-coded sequence is transmitted with different values of the initial phase, i.e. the value of the initial phase of the elements of the Quaternary-coded sequence determines its belonging to a number of additional sequence.

The disadvantage of this device is the lack of coherent convolution Quaternary-coded sequence, and cannot be used for processing optical signals in fiber-optic communication systems, which limits the scope of application of this device for receiving the Quaternary-coded sequences.

The objective of the invention is to develop a device for receiving the Quaternary-coded sequences, ensuring the achievement of the technical result consists in extending the scope of application of C is a coherent account of a convolution of the optical level of the complex signal. This increases the noise immunity of digital optical signal or increasing the length of the regenerator section of a fiber-optic transmission fiber optic communication systems when receiving digital data and synchronization.

To achieve a technical result in the known device for receiving the Quaternary-coded sequences containing serially connected multi-tap delay line, the switch, and k-1 delay blocks (k - output multi-tap delay line connected to the corresponding k - inputs of the switch)and connected in series k-1 converters pulse sequence and sakasamouse block. The second information output and the second information input of each delay unit, respectively, are the second information input and the first information output of the corresponding inverter pulse sequence. Each delay unit made in the form of serially connected delay elements and switches, while the second information output of delay element connected to the second information input of the switch, the output of which is the first information output of the delay block. With this setup the inputs of each delay unit, which is an installation in which the od switch, as well as the setup switch input are the first installation the device inputs. Each transducer pulse sequence contains sakasamouse block and the adder, each sakasamouse block contains the switch, and the second information input and the output of the adder are respectively the second information input and the second information output pulse sequence. With this setup the inputs of each transducer pulse sequences that are setup inputs sakasegawa blocks, as well as the installation log sakasegawa block is the second installation the device inputs. In addition, the device contains a crucial block whose output is the output device. Added a splitter and processing unit of the optical signal, and the input of the coupler is the input device, and the first and second information outputs of the coupler are respectively connected to the input tap of the delay line and to the first information input of the first inverter pulse sequence, the first data input which is input sakasegawa block. Moreover, in each delay unit is additionally connected in series introduced a directional coupler and an adder. PR is the entrance and the second information output of the directional coupler are respectively the first information input and the second information output of the delay block. The second information input of the adder is the second information input of the delay block. Moreover, the output of the adder connected to the input of the delay element. In each transducer pulse sequences have been added to the directional coupler, the input and the second information outputs of which are respectively connected to the output sakasegawa unit and to the first information input of the adder. The first information output of the directional coupler is the first information output pulse sequence. The first information output k-1-th delay unit and the output sakasegawa unit respectively connected to the first and second information inputs of the processing unit of the optical signal, the output of which is connected to the input of the decision making unit.

In sakasamouse block added Phaser π and a combiner. Moreover, the first and second information outputs of the switch respectively connected to the input of the phase shifter on π and to the second information input of the combiner, the first information input of which is connected to the output of the phase shifter on π. When this information and installation inputs of the switch, respectively, are informational and installation inputs sakasegawa block. The output of the integrator, it is the information output sakasegawa block.

The processing unit of the optical signal consists of an adder, a matching device, photodetector, amplifier, low pass filter, Phaserand automatic gain control. Moreover, in the processing unit of the optical signal are connected to the phase shifterthe adder, the matching device, photodetector, videosreal and low pass filter whose output is the output of the processing unit of the optical signal. The output of videoseries connected to the input of automatic gain control, the output of which is connected to the control input of the amplifier. The first information input of the adder and the input of the phase shifterare respectively the first and second information inputs of the processing unit of the optical signal.

Thanks to the new essential features due to the introduction of the coupler, directional couplers and processing unit of the optical signal is the possibility of using coherent convolution on the optical level of the Quaternary-coded sequences. This provides the opportunity to expand the scope of the claimed device, in particular, improving the noise immunity of the digital optical signal or increase denyregistration site fiber optic transmission fiber optic communication systems when receiving digital data and synchronization.

Conducted by the applicant's analysis of the prior art, including searching by the patent and scientific and technical information sources, and identify sources that contain information about the equivalents of the claimed invention, has allowed to establish that the applicant had not discovered similar, characterized by signs, identical with all the essential features of the claimed invention. Select from a list of identified unique prototype, as the most similar in essential features analogue, has identified a set of essential towards perceived by the applicant to the technical result of the distinctive features in the claimed device, set forth in the claims. Therefore, the claimed invention meets the criterion of "novelty".

To check compliance with the claimed invention, the criterion of "inventive step", the applicant conducted an additional search of the known solutions to identify signs that match the distinctive features of the prototype of the characteristics of the claimed device. The search results showed that the claimed invention not apparent to the expert in the obvious way from the prior art, as defined by the applicant. Not identified the impact of changes under the essential features of the claimed invention, on the achievement of the technical result is A. In particular, the claimed invention does not provide the following transformations: addition of known means of any known part attached to it according to certain rules, to achieve a technical result, in respect of which it is the effect of such additions; the replacement of any part of the other known means known part to achieve a technical result, in respect of which it is the effect of such a change; the exclusion of any part of the funds while the exclusion of its functions and the achievement of a result of such exclusion; an increase of similar elements to enhance the technical result due to the presence in the vehicle is such elements; the execution of a known drug or part of a known material to achieve a technical result due to the known properties of the material; the creation of tools, consisting of well-known parts, the choice of which and the relationship between them is carried out on the basis of known rules, recommendations, and achievable technical result is due only to the known properties of the parts of this object and the relationships between them; change quantitative attributes or relations of signs, if known fact influence kadogos them on the technical result and the new values of the signs or their relationship could be obtained from the known dependencies.

Therefore, the claimed invention meets the criterion of "inventive step".

The invention is illustrated graphic materials showing: 1 - structural diagram of the device for receiving the Quaternary-coded sequences; figure 2 - structural diagram sakasegawa unit; figure 3 is a structural diagram of the processing unit of the optical signal; figure 4 is a plot illustrating the principle of convolution additional sequences in the first delay unit and the first transducer pulse sequence; 5 is a plot illustrating the principle of convolution additional sequences in the k-1-th delay unit and k-1-th inverter pulse sequence; 6 is a plot illustrating the principle of convolution additional sequences in the block processing of the optical signal.

Information confirming the ability of the invention to provide the above technical result are as follows.

The device for receiving the Quaternary-coded sequences presented in figure 1, containing serially connected multi-tap delay line 4, the switch 1, k-1 delay blocks 21-2k-1the processing unit of the optical signal 7 and a crucial block 8, k - output multi-tap delay line 4 connected to correspond to the named k - the inputs of the switch 1. Also connected in series k-1 converters pulse sequence 51-5k-1and sakasamouse unit 6, the output of which is connected to the second information input of the processing unit of the optical signal 7. The second information output and the second information input of each delay unit 21-2k-1are respectively the second information input and the first information output of the corresponding inverter pulse sequence 51-5k-1. Each delay unit 21-2k-1made in the form of series-connected directional coupler 2.11, adder 2.21delay elements 2.31and switch 2.41. Input and second output of the directional coupler 2.11respectively are the first information input and the second information output of the delay block 21the second information input of the adder 2.21is the second information input of the delay block 21the second information output of the delay element 2.31connected to the second information input of the switch 2.41whose output is the first information output of the delay block 21. With this setup the inputs of each delay unit 21who are the installation of the WMO is AMI switches 2.4 1and installation switch input 1 are the first installation the device inputs. Each transducer pulse sequence 51-5k-1made in the form of series-connected sakasegawa block 5.11, directional coupler 5.21and adder 5.31the entrance sakasegawa block 5.11is the first information input of the Converter pulse sequence 51the first information output directional coupler 5.21is the first information output pulse sequence 51the second information input and the output of the adder 5.31are respectively the second information input and the second information outputs of the drive pulse sequence 51. With this setup the inputs of each transducer pulse sequence 51-5k-1that are setup inputs sakasegawa blocks 5.11and the installation log sakasegawa unit 6 are second mounting the device inputs. The input of the splitter 3 is an input device, the first and second information outputs of the coupler 3, respectively connected to the input tap of the delay line 4 and to the first information input of the first conversion on the indicator pulse sequence 5 1the first information input of which is the entrance sakasegawa block 5.11the output of the decision making unit 8 is output device.

Switch 1 is designed to connect in accordance with the number j Rademacher functions (where j=0,1,..., k) the k-th output tap of the delay line 4 to the first information input of the first delay unit 21. It can be implemented as described in the book IRE "Fiber optic network" (M: Eco-Trends, 2000, p.60-61, is a), and also in the book Now "Modern technologies for digital fiber optic communication networks" (M.: Radio and communication, 2000, s, Fig.10-12).

The delay blocks 21-2k-1, each of which consists of a directional coupler 2.11, adder 2.21, delay elements 2.31and switch 2.41designed for the convolution of the first additional sequence and delays its output on time in accordance with the number j Rademacher functions.

Directional couplers 2.11-2.1k-1in the delay blocks 2i-2k-i and directional couplers 5.21-5.2k-1in converters pulse sequence 51-5k-1identical and are used for separating the optical signal on the direct and the reflected optical signal, characterized inwith half the power of optical with the persecuted in every branch of the directional coupler. They can be implemented, as described in the book MBA and other "Fiber-optic transmission systems" Ed. by Vingativa (M.: Radio and communication, 1992, p.194-209, figure 6.10 (b, d).

Adders 2.21-2.2k-1in the delay blocks 21-2K-1the adders 5.31-5.3k-1in converters pulse sequence 51-5k-1and the adder 7.1 in the block processing of the optical signal 7 are identical and are designed for combining the first and second complementary sequences. They can be implemented, as described in the book MBA and other "Fiber-optic transmission systems" Ed. by Vingativa (M.: Radio and communication, 1992, p.194-209, figure 6.10 a, b).

The delay elements 2.31-2.3k-1designed to delay the first additional sequence at the first and second information outputs, respectively, at the 2h-1τ and 2hτ (where h=1,2,...,k-1 is the number of delay elements 2.3k-1the delay block 2k-1). They can be implemented, as described in the book Lehrerin "communication Systems with noise-like signals" (M.: Radio and communication, 1985, s-361, RIS).

Switches 2.41-2.4k-1designed for connection in accordance with the number j Rademacher functions of the first or second information outputs of the delay elements 2.31-2.3k-1to the second information output unit ass is Riki 2 1-2k-1. They can be implemented, as described in the book MBA and other "Fiber-optic transmission systems" Ed. by Vingativa (M.: Radio and communication, 1992, s-221, RIS).

Splitter 3 is designed to divide the Quaternary-coded sequence into two additional sequences with half the power in each branch. It can be implemented as described in the book MBA and other "Fiber-optic transmission systems" Ed. by Vingativa (M.: Radio and communication, 1992, p.194-209, figure 6.10 a, b).

Multi-tap delay line 4 is designed to delay the first additional sequence at the l-th tap multi-tap delay line 2ι-1τ (where l=1,2,..., k is the number of tap multi-tap delay line). It can be implemented as described in the book Lehrerin "communication Systems with noise-like signals" (M.: Radio and communication, 1985, s-361, RIS).

Converters pulse sequence 51-5k-1, each of which consists of sakasegawa block 5.11, directional coupler 5.21and adder 5.31designed in accordance with the number j Rademacher functions to invert (reinvestiture), and a convolution of the second sequence.

Sakasegawa blocks 5.11-5.1k-1in converters of the pulse sequence is eljnosti 5 1-5k-1and sakasamouse unit 6 are identical and are designed to invert (reinvestiture) in accordance with the number j Rademacher functions of the second additional sequence. Option sakasegawa block 5.11presented in figure 2 and consists of a switch 5.1.1, Phaser π the unifier 5.1.2 and 5.1.3. The first and second information outputs switch 5.1.1 respectively connected to the input of the phase shifter on π 5.1.2 and to the second information input of the combiner 5.1.3, the first information input of which is connected to the output of the phase shifter on π 5.1.2. When this information and installation switch inputs 5.1.1 respectively are informational and installation inputs sakasegawa block 5.1. The output of combiner 5.1.3 information is output sakasegawa block 5.1.

Switch 5.1.1 is designed to connect its input to its first or second information output in accordance with the number j Rademacher functions. It can be implemented as described in the book MBA and other "Fiber-optic transmission systems" Ed. by Vingativa (M.: Radio and communication, 1992, s-221, RIS).

Phaser π 5.1.2 to rotate the phase of the optical signal on π. It is made in the form of two series-connected electro-optical modulator is in based on the effect of parcels and can be implemented as described in the book NAV "Modern technologies for digital fiber optic communication networks" (M.: Radio and communication, 2000, s-349, 10-36).

Unifier 5.1.3 designed to combine optical signals. It can be implemented as described in the book MBA and other "Fiber-optic transmission systems" Ed. by Vingativa (M.: Radio and communication, 1992, p.194-209, figure 6.10 a, b).

The processing unit of the optical signal 7, a diagram is shown in figure 3, is intended for the final convolution of the Quaternary-coded sequence on the optical level, and processing the optical signal and consists of adder 7.1, the matching device 7.2, the photodetector 7.3, amplifier 7.4, lowpass filter 7.5, Phaserand automatic gain control 7.7. Moreover, in the processing unit of the optical signal 7 are connected to the phase shifterthe adder 7.1, matching device 7.2, the photodetector 7.3, videosreal 7.4 and the lowpass filter 7.5 whose output is the output of the processing unit of the optical signal 7. The output of videoseries 7.4 connected to the input of automatic gain control 7.7, the output of which is connected to the control input of the amplifier 7.4. The first information input of the adder 7.1 and the input of the phase shifter on - 7.6, respectively, are first and second information inputs of the processing unit of the optical signal 7.

Matching device 7.2 is designed to output optical radiation from the fiber fiber fiber-optic cable and pair it with a photodetector 7.3. It can be implemented as described in the book MBA and other "Fiber-optic transmission systems" Ed. by Vingativa (M.: Radio and communication, 1992, s, RES).

The photodetector 7.3 is designed to convert an input optical signal into an electrical digital signal. It can be implemented as described in the book Abiview "Fiber optics: components, transmission systems, dimension (M: Cyrus System, 1999, s-154, RIS).

Amplifier 7.4 is designed to enhance the digital signal to the level required for further processing. It can be implemented as described in the book Linestream and other "Military systems multichannel communication" edited Atibaia (HP: YOU, 1979, C-265, RIS, RIS).

The lowpass filter 7.5 is used for separation of the useful signal and the effective suppression of any side-Raman oscillations at the input of the decision making unit 8. It can be implemented as described in the book Appalaccia "fundamentals of theory of linear electric circuits" (M.: Communication, 1967, s-596, RIS, RIS).

F is sobradiel to rotate the phase of the second additional sequence onIt is made in the form of an electro-optical modulator based on the effect of parcels and can be implemented as described in the book NAV "Modern technologies for digital fiber optic communication networks" (M.: Radio and communication, 2000, s-349, 10-36).

Automatic gain control 7.7 is designed to generate the control voltage to adjust the gain of the amplifier 7.4 at low level of the input digital signal, providing the linearity of the whole path of the digital signal. It can be implemented as described in the book Linestream and other "Military systems multichannel communication" edited Atibaia (HP: YOU, 1979, s-308, RIS).

Crucial unit 8 is designed for a decision on the identification and registration of a single element of the digital signal. It can be implemented as described in the book MBA and other "Fiber-optic transmission systems" Ed. by Vingativa (M.: Radio and communication, 1992, p.34-36, RIS).

The device for receiving the Quaternary-coded sequences presented in figure 1, works as follows.

On the first installation the device inputs (figure 1) to receive the Quaternary-coded sequence with period N=2k(where N is the Chi is lo elements in the Quaternary-coded sequence) is switched multi-tap delay line 4 and the delay elements 2.3 1-2.3k-1in accordance with the number j Rademacher functions corresponding accept the Quaternary-coded sequence, according to the following rule:

a) the number of tap multi-tap delay line 4, which switch 1 is switched to the first information input of the delay block 21that is the sign of the directional coupler 2.11by the expression l=k-j+1 (where l=1,2,..., k; l is the number of tap multi-tap delay line).

b) depending on the number j Rademacher functions are formed in the installation of the voltage Uvhostcoming on the installation inputs of switches 2.41-2.4k-1blocks delay 21-2k-1.

Non delay blocks 21-2k-1in which switches 2.41-2.4k-1connect the second information outputs of the delay elements 2.31-2.3k-1to their outputs, which are the second information outputs of the delay blocks 21-2k-1are determined according to the following rule:

On the second installation to the device inputs (figure 1) to receive the Quaternary-coded sequence with period N=2ksakasegawa blocks 5.11-5.1k-1converters pulse sequence 51-5k-1and sakasamouse unit 6 included in the mode inv is tiravanija or reinvestiture received at their inputs the Quaternary-coded sequence in accordance with the number of E-code (where i=0,1,...,N-1, i-room E-code), the corresponding accept the Quaternary-coded sequence, according to the following rule:

a) at room E-code i=7 (for k=3) in the binary number E-code corresponds to a code combination 111, therefore, the installation of the voltage Uvhost. 3Bcoming on the installation inputs sakasegawa blocks 5.11-5.1k-1and 6 will meet Uvhost. 3B=1.

As an example, on plots figa shows the cyclic input splitter 3 of the optical signal in the form of two Quaternary-coded sequences (E-code) αδβδβγβδ alphabet α, β, γ, δ when the number of elements N=8, where α=-β, γ=-δand the elements α and β orthogonal γ and δ. This can be, for example, photomanipulation the sequence in which the initial phase elements take values

In the splitter 3 quadruple-encoded sequence (figa) is divided into two additional sequences with half the power in each branch of the coupler 3. On the first and second information outputs of the coupler 3, respectively, are formed first and second additional sequence. The first additional sequence of odd elements Thur the hex-encoded sequence α that β are active, and even elements in the Quaternary-coded sequence γ, δ are passive. The second additional sequence even elements in the Quaternary-coded sequence γ, δ are active and odd elements in the Quaternary-coded sequence α, β are passive. The frequency of alternation of the active elements of one and the other additional sequences is determined by the number j Rademacher functions. For example, when j=k active elements of one sequence are interleaved with active elements of the other sequence through one, and when j=1 first, followed by all the active elements of the first sequence, and then all the active elements of the second sequence. The plot of the first and second complementary sequences when j=k=3 is presented on figb, respectively, while the inactive elements of the first and second complementary sequences on plots allocated as dark squares.

The first additional sequence (figb) is fed to the input tap of the delay line 4, in which the first additional delay sequence (figb) in its l-th tap is equal to 2l-1τ. Switch 1 provides, in accordance with the number j=3 Rademacher functions connecting the first output l=1 m is ohoohwooe delay line 4 to the first information input of the delay block 2 1that is the sign of the directional coupler 2.11. Therefore, the first additional sequence (figb) in multi-tap delay line 4 is delayed by τ. Plot detained first additional sequence presented on Figg This ensures that the combination of time active and passive elements of the first (delayed τ) and second complementary sequences (FIGU, g), while the first and second additional sequence (FIGU, g) are 2k-1active elements. The second additional sequence (pigv) is supplied to the first information input of the Converter pulse sequence 51that is an information input sakasegawa block 5.11.

Sakasamouse block 5.11presented in figure 2 (similarly implemented all other sakasegawa blocks 5.1k-1and 6). Sakasamouse block 5.11works in the following way. The second additional sequence (pigv) is supplied to the information input switch 5.1.1, where upon receipt of the installation of the voltage Uvhosts=0 on the installation log switch 5.1.1 the second additional sequence (pigv) with the first data output switch 5.1.1 through the Phaser on π 5.1.2 comes the and the first information input of the combiner 5.1.3. Output sakasegawa block 5.11formed inverted quadruple-encoded sequence. When entering the installation of the voltage Uvhosts=1 on the installation log switch 5.1.1 the second additional sequence (pigv) with the first data output switch 5.1.1 is supplied to the second information input of the combiner 5.1.3. At the output of the combiner 5.1.3, the output of which is output sakasegawa block 5.11formed non-inverted quadruple-encoded sequence (pigv), which corresponds to an additional sequence, coming to the information input of the optical switch 5.1.1. Therefore, sakasegawa blocks 5.11-5.1k-1(unit 6) working according to the following rule:

Thus, under the action of the adjusting voltage Uvhosts=0 on the installation inputs sakasegawa blocks 5.11-5.1k-1and 6 on their outputs is formed inverted second additional sequence, and under the influence of the installation of the voltage Uvhosts=1 on the installation inputs sakasegawa blocks 5.11-5.1k-1and 6 on their outputs is formed non-inverted second additional sequence that corresponds to the additional serial is a major, coming to the information inputs sakasegawa blocks 5.11-5.1k-1and 6. For example, selected such E-code whose second mounting the device inputs all sakasegawa blocks 5.11-5.1k-1and 6 included in the mode reinvestiture phase entering their information second additional input sequence.

Output sakasegawa block 5.11the second additional sequence (pigv) is fed to the input of a directional coupler 5.21. In a directional coupler 5.21with translucent mirror the second additional sequence (pigv) splits into two branches (with half power of the second additional sequence in each branch of the directional coupler 5.21). On the first and second information outputs of the directional coupler 5.21respectively formed by the reflected and direct the second additional sequence. With the second information output directional coupler 5.21the second additional sequence (figure 4), without phase change (direct), is fed to the first information input of the adder 5.31and with the first data output of the directional coupler 5.21that is the first information output pulse sequence 5 1recorded second additional sequence that differs bysupplied to the second information input of the delay block 21that is the second information input of the adder 2.21. Plot the reflected second additional sequence presented on Figg.

From the output of the switch is delayed for 1 τ first additional sequence (high) is supplied to the first information input of the delay block 21that is an information input directional coupler 2.11. In a directional coupler 2.11with translucent mirror detained first additional sequence (Figg) splits into two branches (with half the capacity of the first additional sequence in each branch of the directional coupler 2.11). On the first and second information outputs of the directional coupler 2.11respectively formed direct and reflected the first additional sequence. With the first data output of the directional coupler 2.11first detained an additional sequence (Figg), without phase change (direct), is fed to the first information input of the adder 2.21and with the second information output directional coupler 2.11that is which is the second information output of the delay block 2 1recorded first detained an additional sequence that differs bysupplied to the second information input of the Converter pulse sequence 51that is the second information input of the adder 5.31. Plot reflected detained first additional sequence presented in figure 4 E.

Additional sequence into force of the mechanism of their formation is characterized by the fact that half of their active elements have the same phase, and the other half of the active elements of opposite phase. Therefore, the adders 2.21and 5.31is the sum of phase 2k-2active elements additional sequences with the same phase (in the adder 2.21cumulative sequence represented by Figg and Figg, and in the adder 5.31cumulative sequence represented by figv and five). As a result, the outputs of the adders 2.21and 5.31the formation of new, additional sequences, but they contain 2k-2the active element with an amplitude twice as large than those items taken Quaternary-coded sequence. The plot of the newly formed first and second complementary sequences presented at the Phi is g, C, respectively.

From the output of the adder 5.31the second additional sequence (figs) is supplied to the second information output pulse sequence 51. From the output of the adder 2.21the first additional sequence (figs) to the input of the delay element 2.31. The first information output of the first additional sequence (figs) is delayed by 2h-1τand on the second information output of the delay element 2.31the first additional sequence (figs) is delayed by 2hτ.

Upon entering the installation inputs of switches 2.41-2.4k-1the installation of the voltage Uvhost=1 they are connected to their outputs (which are the first informational outputs of the delay blocks 21-2k-1first, the information outputs of the respective delay elements 2.31-2.3k-1that provides a delay of the first additional sequence on the 2h-1τand upon receipt of the setup inputs of switches 2.41-2.4k-1the installation of the voltage Uvhost=0 they are connected to their outputs second information outputs of the respective delay elements 2.31-2.3k-1that provides a first additional delay consequently the STI 2 hτ. For example, the selected E-code (when k=j=3), where on the first installation the device inputs all switches 2.41-2.4k-1connect the second information outputs of the delay elements 2.31-2.3k-1to the second information outputs of the delay blocks 21-2k-ithat provides a delay of the first additional sequence on the 2hτ delay blocks 21-2k-1. Therefore, the first additional sequence (figs) in the delay unit 21is delayed by the second information output of the delay element 2.31on 2 τ and switch 2.41connected to the first information output of the delay block 21. Plot detained first additional sequence in the delay element 2.31the first information output of the delay block 21presented at Figi.

Thus, the delay block 21provides by means of the delay elements 2.31and switch 2.41the combination of active elements formed new additional sequences (figs, and).

On the first and second information outputs of the directional coupler 2.12the newly formed straight (figure 4 and or figb) and reflected (Figg) first additional sequence, and the first and the torus information outputs of the directional coupler 5.2 2the newly formed flipped (pigv) and direct (figs or figa) second additional sequence. In the adders 2.22and 5.32summarizes relevant direct (figs, or figa, b) and reflected (FIGU, g) additional sequence, and outputs the formation of new, additional sequence containing 2k-3active element with amplitude 4 times larger than those items taken Quaternary-coded sequence, and so on. The plot of the newly formed first and second complementary sequences presented on Figg, e, respectively.

The first additional sequence (figd) in the delay unit 22is delayed by the second information output of the delay element 2.32on 4τ and switch 2.42connected to the first information output of the delay block 22. Plot detained first additional sequence in the delay element 2.32the first information output of the delay block 22presented at figs.

The first additional sequence (figs) with the first data output of the delay block 22goes to the first information input of the processing unit of the optical signal 7, and the second additional sequence (five with the second information of the inverter output pulse sequence 5 2comes on information input sakasegawa unit 6. Under the action of the adjusting voltage Uvhosts=1 on the installation log sakasegawa block 6 on its outputs non-inverted second additional sequence (fige), which corresponds to an additional sequence, coming to the information input sakasegawa unit 6. Output sakasegawa unit 6 second additional sequence (file) is supplied to the second information input of the processing unit of the optical signal 7.

The processing unit of the optical signal 7 is presented in figure 3. The processing unit of the optical signal 7 is as follows. The first additional sequence (figs or figa) is supplied to the first information input of the adder 7.1, and the second additional sequence (five or figb) is supplied to the PhaserThe Phaserthe second additional sequence (figb) turnsPlot rotatedthe second additional sequence presented on figv. From the output of the phase shifterthe second additional sequence (pigv) is supplied to the second information is input adder 7.1, where the addition of the first phase (figa) and second (pigv) additional sequences with amplitude 2k-1. Plot collapsed Quaternary-coded sequence presented on Figg

At the output of the adder 7.1 over time 2k-1τ after the beginning of the receipt of the input device Quaternary-coded sequence signal with the phase of the Δϕαwill be missing, but after this time will receive a pulse of τ with an amplitude of 2ktimes the amplitude element of the Quaternary-coded sequence and phase Δϕα.

Thus, in the process of receiving the Quaternary-coded sequence, a signal is generated (Figg) with amplitude proportional to the autocorrelation function (ACF) of this sequence provided that for the second installation to the device inputs sakasegawa blocks 5.11-5.1k-1and 6 are included in accordance with the number of E-code corresponding to the received Quaternary-coded sequence, and the first installation inputs the device has been switched multi-tap delay line 4 and the delay elements 2.31-2.3k-1in accordance with the number j Rademacher functions corresponding accept the Quaternary-coded sequence. In which the result is coherent convolution on the optical level of the Quaternary-coded sequence with increasing amplitude of the optical signal at the input of the photodetector N times with phase Δ ϕα

Therefore, the collapsed Quaternary-coded sequence at the input photo detector 7.3 can be represented by the following expression:

U7.1=NUccos(2πƒn+Δϕα),

where ƒn- frequency carrier signal; Ucthe amplitude of the Quaternary-coded sequence.

Convolution Quaternary-coded sequences (codes Welty or E-codes) is characterized by the fact that the aperiodic ACF has a pulse type (no side emission) Uα=000000080000000 when N=8 and Uwith=1.

In the proposed device receiving the Quaternary-coded sequence is relatively easy solved the problem of coherent optical convolution of the signal, because fluctuations are taken from the same source. Any changes in light line from the transmitter to the receiver are the same for all elements of the Quaternary-coded sequence.

ACF Quaternary-coded sequence (Figg) is fed to the input of the matching device 7.2, which outputs optical radiation from the fiber fiber fiber-optic cable and matches it with the photodetector 7.3. With matching device 7.2 ACF Quaternary-coded sequence (high) to the input of the photodetector 7.3. Thus, the output is e photodetector 7.3 formed digital signals, presented on the plots Figg.

Due to the fact that the elements of the Quaternary-coded sequence α and β orthogonal γ and δ, the output of the photodetector 7.3 responses to "alien" signals is equal to zero, i.e. at the output of the photodetector 7.3 Uβ=0, Uγ=0 and Uδ=0.

Formed (high) digital signal output from the photodetector 7.3 is fed to the input of videoseries 7.4 for the primary amplification of the digital signal. From the output of videoseries 7.4 digital signal is simultaneously fed to the input of an automatic gain control 7.7 and lowpass filter 7.5. In the automatic gain control 7.7 generated control voltage, which is supplied to the control input of videoseries 7.4 for automatic control of the gain of the amplifier 7.4 at low level of the input digital signal, providing the linearity of the whole path of the digital signal. In the lowpass filter 7.5 is the selection of the useful digital signal and an effective suppression of side combinational components of the digital signal. From the output of the lowpass filter 7.5 digital signal is fed to the input of the decision making unit 8.

Crucial unit 8 restores the original shape and the amplitude of the signal and its temporary location on the clock interval. The solution to solve the em unit 8 is made with a zero threshold, that is, by law, the voltage at the output of the lowpass filter.

Thus, the proposed device for receiving the Quaternary-coded sequence provides increased in scope by improving the noise immunity of digital optical signal or increasing the regenerator section length of fiber-optic transmission lines due to coherent convolution on the optical level of the complex signal for fiber-optic communication systems as receive discrete data and synchronization.

The above data confirm that the implementation of the use of the claimed device the following cumulative conditions:

the tool embodying the claimed device in its implementation, is intended for use in fiber-optic communication systems as receive discrete data and synchronization;

for the claimed device, as it is characterized in the claims, confirmed the possibility of its implementation using the steps described in the application or known before the priority date tools and methods;

the tool embodying the claimed invention in its implementation, is able to achieve perceived by the applicant of the technical result.

Thus, the claimed invention meets criter the Yu "industrial applicability".

1. The device for receiving the Quaternary-coded sequences containing serially connected multi-tap delay line, the switch, and k-1 delay blocks, with k outputs multi-tap delay line, where k≥2 is an integer, each connected to the k input of the switch, also connected in series k-1 converters pulse sequence and sakasamouse unit, the second information output and the second information input of each delay unit, respectively, are the second information input and the first information output of the corresponding inverter pulse sequence, and each delay unit made in the form of serially connected delay elements and switches, the second information output of delay element connected to the second information input of the switch, the output of which is the first information output of the delay block, with the installation of the inputs of each delay unit, which are setup inputs of the switches, as well as the setup switch input are the first installation the device inputs, and each transducer pulse sequence contains sakasamouse block and the adder, each sakasamouse block contains the switch and vtoro the information input and the output of the adder are respectively the second information input and the second information output pulse sequence, with this setup the inputs of each transducer pulse sequences that are setup inputs sakasegawa blocks, as well as the installation log sakasegawa block is the second installation of the input device, the deciding unit whose output is the output of the device, characterized in that additionally introduced splitter and processing unit of the optical signal, and the input of the coupler is the input device, and the first and second information outputs of the coupler are respectively connected to the input tap of the delay line and to the first information input of the first inverter pulse sequence, the first data input which is input sakasegawa unit, with each unit delay added sequentially directed the United tap and the adder, the input and the second information output of the directional coupler are respectively the first information input and the second information output of the delay unit and the second information input of the adder is the second information input of the delay unit and the output of the adder connected to the input of delay elements, and each transducer pulse sequence further introduced a directional coupler, a second input information, the output of which is respectively connected to the output sakasegawa unit and to the first information input of the adder, the first information output of the directional coupler is the first information output pulse sequence, and the first information output (k-1)-th delay unit and the output sakasegawa unit respectively connected to the first and second information inputs of the processing unit of the optical signal, the output of which is connected to the input of the decision making unit.

2. The device for receiving the Quaternary-coded sequences according to claim 1, characterized in that sakasamouse block added Phaser π and a multiplexer, and the first and second information outputs of the switch respectively connected to the input of the phase shifter on π and to the second information input of the combiner, the first information input of which is connected to the output of the phase shifter on πinformation and installation inputs of the switch, respectively, are informational and installation inputs sakasegawa unit, and the output of the combiner is an information output sakasegawa block.

3. The device for receiving the Quaternary-coded sequences according to claim 1, characterized in that the processing unit of the optical signal consists of an adder, a matching device, photodetector, amplifier, low pass filter, Phaser &x003C0; /2 / automatic gain control and processing unit of the optical signal are connected to the phase shifter on π/2, the adder, the matching device, photodetector, videosreal and low pass filter whose output is the output of the processing unit of the optical signal, and the output videoseries connected to the input of automatic gain control, the output of which is connected to the control input of the amplifier, and the first information input of the adder and the input of the phase shifter on π/2 are respectively the first and second information inputs of the processing unit of the optical signal.



 

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