Otn system and method of supporting bidirectional transmission of light from optical supervisory channel on one fiber

FIELD: radio engineering, communication.

SUBSTANCE: system includes upper and lower nodes in which two optical amplifier blocks and one optical supervisory channel block are provided, in addition, each node also has one multiplexer/demultiplexer consisting of an optical circulator and a multiplexer/demultiplexer. In this case, the output path of the optical supervisory channel block is connected to the upsteam interface of the optical circulator, and the common circulator interface is connected to the mentioned multiplexer/demultiplexer, the downstream interface is connected to the incoming path of the optical supervisory channel block; multiplexers/demultiplexers of two nodes are connected to each other by two optical fibers, in one of them the bidirectionally transmitted light from the optical supervisory channel and the light of direct traffic pass, and in the other the light of the reverse traffic passes.

EFFECT: improving the quality of contact by receiving and transmitting light with a wavelength of light from the optical supervisory channel in one fiber, which eliminates the asymmetry of the transmit and receive paths and ensures equalization of receiving and transmitting delays.

8 cl, 4 dwg

 



 

Same patents:

FIELD: radio engineering, communication.

SUBSTANCE: invention relates to communication engineering and can be used in an orthogonal frequency division multiple access (OFDMA) communication system. The signalling channel is used to provide signalling, acknowledgement and power control to access terminals within the system. The shared signalling channel can be assigned to a predetermined number of sub-carriers within any cycle. The assignment of a predetermined number of sub-carriers to the shared signalling channel establishes a fixed bandwidth overhead for the channel. The actual sub-carriers assigned to the channel can be varied periodically, and can vary according to a predetermined frequency hopping schedule. The amount of signal power allocated to the signalling channel can vary on a per symbol basis depending on the power requirements of the communication link. The shared signalling channel can direct each message carried on the channel to one or more access terminals. Unicast messages allow the channel power to be controlled in accordance with the needs of individual communication links.

EFFECT: high transmission channel throughput.

23 cl, 5 dwg

FIELD: radio engineering, communication.

SUBSTANCE: device consists of third, second and first level channel splitters, third (GSK-16), second (GSK-4) and first (OSK) level standard spectral channel switches, first, second and third level channel couplers, as well as a control unit which generates commands for setting up the operating mode of the multiplexer and switching the standard spectral channels.

EFFECT: design of an add/drop multiplexer based on standard spectral channels, which do not require controlled dynamic adjustment of transfer constants of component elements, while ensuring high-speed operation, low inserted losses, high cross-talk attenuation between neighbouring channels, enabling switching and adding/dropping of all standard spectral channels transmitted over a linear path of fibre-optic transmission systems with spectral channel division.

5 cl, 22 dwg

FIELD: radio engineering, communication.

SUBSTANCE: disclosed is a method and an apparatus which enable to conceal protected information in spectrally clocked sets of N multi-protocol data streams. Owing to introduction of decision feedback at the physical layer and enabling adaptation of transmission rate to the quality of the steganographic transmission channel, the reliability of receiving secure information considerably increases.

EFFECT: high security of transmitting additional information with a variable rate and given reliability.

4 cl, 9 dwg

FIELD: information technologies.

SUBSTANCE: invention includes a fibre optic line of information transfer, lasers with various lengths of radiation waves, a multiplexer, a fibre line, an optical amplifier, a demultiplexer, photodetectors, paraphase amplifiers, differential amplifiers, optical couplers and an inverting amplifier. A feature of the invention is, in particular, generation of a summary signal of constant power arriving to the optical amplifier (OA) from information optical signals.

EFFECT: elimination of non-linear distortion and cross noise occurring in an optical amplifier, which makes it possible to use analogue modulation of signals in a fibre optic communication line or to increase quality of digital information signals.

2 cl, 2 dwg

FIELD: physics.

SUBSTANCE: invention is a method for a controlled selective adding/dropping a channel in a fibre-optic communication system with wavelength-division multiplexing of 2N channels whose optical frequencies can be adjusted, but the spectral interval Δv between neighbouring channels is contestant, through controlled optical add/drop multiplexers (70, 80, 90), which include multi-stage structures of differently connected optical filters ({75-i}, {85-i}, {95-i}), having devices for controlled adjustment of their transfer constants. The optical filters used are asymmetrical single-stage (20), two-stage (40) and/or multi-stage (60) Mach-Zehnder interferometers.

EFFECT: adding/dropping a desired channel from an optical signal by controlling spectral characteristics of filter stages of the multiplexer.

22 cl, 12 dwg, 1 tbl

FIELD: physics.

SUBSTANCE: controlled optical multiplexer includes a multiple-step structure of filters having elements for controlled adjustment of transfer constants. The optical filters used are asymmetrical Mach-Zehnder interferometres: single-stage and/or two-stage, and/or multistage. Electro-optical or thermo-optical phase-shift devices serve for controlled adjustment of transfer constants of the optical filters. The multiplexer can be made on integrated-optical technology in form of a monolithic solid-state device.

EFFECT: controlled multiplexing of channels in the fibre optic communication system with wavelength-division multiplexing of channels, whose optical frequencies can be adjusted for constant spectral interval neighbouring channels Δν.

7 cl, 9 dwg, 2 tbl

FIELD: physics.

SUBSTANCE: invention is designed for fibre optic lines of optical ATS (OATS) for broadband city and inter-city video-telephone, multimedia and telephone communication. The multiplexing device has an optical channel on several repeatedly used prisms which is common for all or for a large number of fibre optic lines of city and intercity OATS. In a subscriber access system with capacity of up to 80000 channels, one device will multiplex into a main line with average density of up to 500-1000 channels from terminal lines with low density Δλ=1 nm, and a terminal device will multiplex into a line with low density of up to 50 channels from subscriber terminals.

EFFECT: design of optical multiplexing devices which are easy to adjust to any range from visible to infrared waves and to any wavelength in that range.

3 cl, 4 dwg, 3 tbl

FIELD: information technologies.

SUBSTANCE: device for fiber-optic communication system with wavelength-division multiplexing 2N channels where N is integer and N≥2 with spectral interval between adjacent channels Δv0 for performing input/output of 2M channels where M is integer and 1≤M<N, has one entering port, one exiting port, 2M output ports, 2M input ports and contains: controlled optical input/output multiplexer, optical demultiplexer of "1×2M" configuration, optical multiplexer of "2M×1" configuration and controller. This device can be used as multichannel controlled or multichannel reconfigurable optical input/output multiplexer.

EFFECT: performing input and output of multiple channels from optical signal with channel wavelength-division multiplexing using controlled dynamic filtering elements capacity restructuring.

13 cl, 16 dwg, 3 tbl

FIELD: physics.

SUBSTANCE: multichannel controlled input/output optical multiplexer for fibre-optic communication systems with wavelength-division multiplexing of 2N channels, where N is an integer and N≥2, optical frequencies of which can be adjusted at constant spectral interval Δν0 between neighbouring channels, for input/output of 2M channels, where M is an integer and 1≤M<N, has a controlled optical demultiplexer with 1×2M configuration, controlled optical multiplexer with configuration 2M×1, 2M controlled input/output optical multiplexers and a controller for controlling adjustment of spectral characteristics of the said demultiplexer, multiplexer and 2M input/output multiplexers.

EFFECT: provision for given transmission capacity of filtering devices in the multiplexer with possibility of input-output of channels with given frequencies through control of spectral characteristics of these filtering devices.

11 cl, 15 dwg, 3 tbl

FIELD: physics.

SUBSTANCE: controlled optical demultiplexer includes a multi-stage structure of optical filters, made with possibility of controlled adjustment of transmission coefficients, as well as a controller for controlling adjustment of transmission coefficients of optical filters. The optical filters used are single-stage asymmetrical Mach-Zehnder interferometres and/or two-stage asymmetrical Mach-Zehnder interferometres and/or multi-stage asymmetrical Mach-Zehnder interferometres. Electro- and thermo-optical phase shift devices serve for controlling adjustment of transmission coefficients of the optical filters. The multiplexer can made using integrated optical technology in form of a monolithic solid-state device.

EFFECT: demultiplexing channels in fibre-optic communication system with wavelength-division multiplexing of channels, optical frequencies of which can be adjusted at constant spectral interval between neighbouring channels Δv.

7 cl, 9 dwg, 2 tbl

FIELD: radio engineering, communication.

SUBSTANCE: invention relates to communication engineering and can be used in wireless communication systems. Disclosed is a misphasing estimation module for estimating misphasing between a first signal of a first data path and a second signal of a second data path in a coherent receiver. The misphasing estimation module comprises a phase detector and an integrator. The phase detector is configured to detect the phase of the first or second signal to obtain a signal phase. Further, the integrator is configured to integrate the obtained signal phase to provide the misphasing estimate.

EFFECT: high communication reliability.

9 cl, 25 dwg

Splitter module // 2556886

FIELD: radio engineering, communication.

SUBSTANCE: optical splitter, which is terminated with adapters, is placed in a single housing. The base is closed with a cover. The reusable, quick-detachable splitter is used on both four ports and eight ports.

EFFECT: shorter installation time when laying an optical cable.

4 dwg

FIELD: radio engineering, communication.

SUBSTANCE: invention relates to automation and communication and can be used on railway transport to control operating processes thereof. The system comprises subsystems for control communication, station administrative communication, two-way fleet communication, train radio communication, basic telephone communication, haul and inter-station communication, informing passengers and workers on railway tracks, an on-board ring IP network connected through routers with station IP networks of railway stations, flag stations and road centralised traffic control centre and integrated telecommunication equipment, which includes telecommunication servers, each connected to the station IP network of one of the serviced stations. The software of each of the servers is configured to provide service in standard mode to subscribers of a group of stations and/or flag stations arranged in series on a section of the rail road, as well as subscribers of a neighbouring telecommunication server in case of breakdown.

EFFECT: improved reliability of communication equipment and providing all types of communication based on an integrated hardware-software platform, based on use of packet switching technology using mutually backed up server equipment.

3 cl, 1 dwg

FIELD: radio engineering, communication.

SUBSTANCE: invention relates to communication engineering and can be used in a hybrid network for in-building wireless (IBW) applications. A hybrid cabling system for providing wireless coverage in a building provides a forward link path and a reverse link path, includes a forward link which includes at least one optical fibre for connecting a first signal generated at a radio frequency input unit with a radio frequency antenna node, and a reverse link which includes coaxial cable, wherein part of the reverse link includes radiating coaxial cable configured to receive a second signal transmitted by wireless terminal equipment in the building and transmit the second signal to the radio frequency input unit, where each link is located on a separate carrier.

EFFECT: high transmission channel throughput.

18 cl, 9 dwg

FIELD: radio engineering, communication.

SUBSTANCE: invention relates to communication engineering and can be used in optical communication systems. The opto-isolator circuit includes an optocouple (303), configured to optically transmit a raw output signal, a conversion circuit (317) connected to the output of the optocouple and configured to convert the raw output signal into a given converted signal, and a control circuit (306) connected to the output of the optocouple. The control circuit (306) is configured to generate an autonomous control signal from the raw output signal after the raw output signal passes through the optocouple (303), wherein the autonomous control signal is generated only if the raw output signal exceeds a given conversion threshold, and to control the conversion circuit (317) and convert the raw output signal into a given converted signal if the autonomous control signal is generated by the control circuit (306) and output the raw output signal to an output port.

EFFECT: high transmission throughput.

19 cl, 5 dwg

FIELD: radio engineering, communication.

SUBSTANCE: invention relates to communication engineering and can be used in optical links. This method is used for an OLT to allocate bandwidth to an optical network unit (ONU), wherein the method includes: estimating input traffic of the ONU according to information from the ONU (S302); setting an input traffic transition signal (S304), which is used to indicate a change in the input traffic of two adjacent dynamic bandwidth allocation DBA cycles of the ONU; and allocating the bandwidth to the ONU according to the input traffic of the ONU and the input traffic transition signal (S306).

EFFECT: providing reliable bandwidth allocation, acceptable transmission delay and reliable use of uplink bandwidth.

14 cl, 11 dwg

FIELD: radio engineering, communication.

SUBSTANCE: invention relates to communication engineering and can be used in optical communication systems. A coded light source in an illumination system is activated using a remote control device. If light source identification is successful, said light source is sent a control message to at least partially turn off its light. The light input of the identified light source is therefore turned off, thereby reducing the probability of conflict of coded light from an already identified light source with identifiers contained in the coded light emitted by other light sources. When there is no more detectable coded light, the sensitivity of the remote control device can be raised until the coded light is detectable again. Additional light sources can then be identified and activated.

EFFECT: improved noise-immunity.

15 cl, 5 dwg

FIELD: physics.

SUBSTANCE: optoelectronic transmitter consists of a power source, a laser, a turned semitransparent reflecting mirror, a correcting lens, an electrical modulator, a small-size photodetector and an automatic switch. The optical output of the laser is connected through the turned semitransparent reflecting mirror to the optical input of the correcting lens. The optical output of the correcting lens is connected to the optical input of the small-size photodetector, having an output which is connected through the electrical modulator to the first input of the automatic switch. The automatic switch has a second input and an output, respectively connected to the output of the power source and the input of the laser.

EFFECT: reduced size and power consumption of the device.

1 dwg

FIELD: electrical engineering.

SUBSTANCE: this device comprises first and second current inputs (1) and (2), current output (3), first and second output transistors (4) and (5) with combined bases, third and fourth output transistors (6) and (7) of the conductivity type with combined bases, first reference current source (8), first current mirror (9) coupled with power supply bus (10), second current mirror (11) coupled with second said bus (12), extra current mirror (13) coupled with second power supply mirror (12), first and second extra voltage sources (14) and (15).

EFFECT: increased response.

5 dwg

FIELD: radio engineering, communication.

SUBSTANCE: invention relates to communication engineering and can be used in optical transport network systems. Disclosed is a load cross-switching processing method for optical transport network (OTN) equipment, which includes a service unit and a cross-switching unit, wherein said service unit includes a first service subunit and a second service subunit. The method includes breaking down, by the first service subunit, data T1 displayed on T time intervals in N/2 lower data buses of the motherboard of the first service subunit, into two parts; breaking down, by a second service subunit, data T2 displayed on T time intervals in N/2 lower data buses of the motherboard of the second service subunit, into two parts; exchanging data and recombination thereof, performed by said first service subunit and said second subunit, and transmitting the recombined data to the cross-switching unit.

EFFECT: high transmission channel throughput.

10 cl, 5 dwg

FIELD: electrical communications; quantum radio engineering and optical communications.

SUBSTANCE: proposed transfer line that can be used, for instance, in fiber-optic, laser, atmospheric optical and other communication systems has sending section and receiving section; sending section has clock generator, E-code shaper, code word shaping unit, additional trains shaping unit, first and second optical signal shaping channels, and optical multiplexer connected through optical signal transfer medium to receiving section; the latter has optical matched filter, directional coupler, first and second optical signal processing channels, subtracter, video amplifier, automatic gain control, optimal filter, resolving unit, and clock frequency recovery unit.

EFFECT: enhanced noise immunity, extended length of transfer line.

7 cl, 12 dwg

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