Transceiving device for limited-access protected fiber-optic data transfer system

IPC classes for russian patent Transceiving device for limited-access protected fiber-optic data transfer system (RU 2297102):

H04B10 - Transmission systems employing beams of corpuscular radiation, or electromagnetic waves other than radio waves, e.g. light, infra-red (optical coupling, mixing or splitting G02B; light guides G02B0006000000; switching, modulation, demodulation of light beams G02B, G02F; devices or arrangements for the control, e.g. modulation, of light beams G02F0001000000; devices or arrangements for demodulating light, transferring the modulation or changing the frequency of light G02F0002000000; optical multiplex systems H04J0014000000)

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FIELD: components of protected fiber-optic data transfer lines; uncontrolled-area limited digital-data transceiving devices.

SUBSTANCE: in order to make it possible to use proposed device in protected fiber-optic transmission systems, it is provided with newly introduced series-connected digital-to-analog converter, matching device, and regulator, radiator control device monitoring input is connected to first output port of controller whose second output port is connected to input of digital-to-analog converter, matching device output is connected to control input of regulator whose output is connected to input of amplifier; output of the latter is connected to input of detector whose output is connected to input of analog-to-digital converter; regulator input is connected to optical receiving module output.

EFFECT: ability of dispensing with controller output signal regulation when switching-on the device.

1 cl, 4 dwg

The invention relates to components protected fiber-optic communication systems and can be used as a transmitting-receiving device of the digital information with restricted access, uncontrolled territory.

The famous "outdoor unit fiber-optic transmission systems" (see RF Patent №2239286 from 14.03.2003, published in BI No. 27.10.2004,). The device according to its functional purpose and composition closest to the claimed device and therefore is taken as a prototype.

Transceiver unit consists of the following components: device management driver, the adder, radiator, control photo detector, integrator, regulator-adder, a bandpass filter, a detector, a control unit, digital to analog Converter, the digital signal generator, the output and input optical fiber transmission lines (fotl), the receiving optical module (PROM), amplifier information signals, device solutions, low pass filter, amplifier control signal, the high pass filter, the level detector filter bandwidth control, digital to analogue Converter (DAC), digital control unit (MCU), light control, the sound emitter.

The above device operates as follows. Input the information the data signals fed to the input of the control device emitter, where a current modulation of the emitter of the information signals. The amount of current can be regulated by control input. The output signal is summed with the current DC bias and control signal. The resulting sum is supplied to the emitter, which emits an optical signal in the fol.

Part of the optical signal at the control photodetector, which converts the input optical signal into an electrical signal. From the output of the photodetector signal comes in two strands: the stabilization of the average optical power emitter and stabilization of amplitude information and control signals.

Chain stabilization of average power contains an integrator and controller-adder. The integrator generates the error signal average radiated power from the target value. The output signal is fed to the input of a device that regulates the current through the emitter, in order to reduce the misalignment to a minimum. Simultaneously, the device produces a modulated direct current alternating current control signal, which is generated by the digital generator and converted into analog form DAC.

Chain stabilization of the amplitude information and control signals consists of a bandpass filter, a detector, a control unit. Bandpass filter extracts from the signal con is roll photodetector control signal, which detector is converted into a DC signal which is proportional to the amplitude of the control signal at the input. At this input level, the control unit generates a constant level control reference voltage of the DAC and the control emitter. Current modulation oscillator is changed in such a way as to minimize the misalignment of the input DC signal with a predetermined voltage. In addition, the unit has a control input, which is a permanent permission signal transmission from the monitoring device. In the absence of this signal, the unit fails to submit to the DAC and the control device emitter constant levels, thereby blocking the transmission of data and control signals.

After passing through the fol optical signal fall on the PROM, which is composed of a photodetector and an amplifier of the photocurrent. At the output of PROM is formed an analog signal proportional to the input optical signal. The received signal at the power information signal, and a lowpass filter. The bandwidth of the passband of the amplifier corresponds to the frequency band of the information signals. Output devices are formed amplified to the desired amplitude of the information signals. Device solutions generates output digital signals in the requirement of the format has been created. The amplifier may comprise an automatic gain control (AGC).

The signal of the low pass filter, is filtered to separate the control signal from the information signal. Next, after amplification by the amplifier control signal and filtering the high-pass filter selected control signal arrives at the detector level. The detector converts the amplitude of the control signal into a signal of a constant level. After this filter is allocated the required bandwidth control. With the filter output signal of a constant level is supplied to the ADC, which generates a digital signal for analysis in a digital control unit (MCU). The control unit analyzes the changes of the input digital signal so that there is a dangerous signal that corresponds to the attempted removal of information from the optical fiber transmission line.

In this case, the generated alarm signal, which is supplied to a sound emitter and a light. At the output of the block is removed constant signal resolution. In the absence of a danger signal at the output of the block is maintained at a constant level permissions. The indicator reflects the current deviation of the input signal from the set value.

Transceiver block has the following disadvantages:

1. The lack of automatic adjustment of the input signal of the digital control unit when connecting to the fol with different transmission ratios.

2. The lack of adjustment of the amplitude of the input signal of the control unit during operation.

3. The complexity of the implementation of technical protection of information from leaking through the optical channel.

Solved technical problem - the creation of a transceiver device with automatic setting when connecting to the fol with different transmission ratios and with periodic automatic tuning during operation, as well as the simplification of technical means of protection of information from leaking through the optical channel.

The technical result is the elimination of the need to adjust the level of the input signal from the controller when connecting and operating the unit as part of protected FOTS.

This technical result is achieved by the fact that the transmitting device is protected fiber-optic transmission systems restricted information includes an optical transmitter that includes a control device and an emitter, the optical output pole of which is connected through fiber-optic transmission line with an input optical terminal of an optical receiver, comprising connected in series receiving optical m is Dul, the amplifier-limiter and device solutions, the output of which is the electrical output of the transceiver device, the control unit comprising an amplifier, a level detector and connected in series ADC, controller, and a sound emitter, the input device control emitter is the input of transceiver devices. What's new is that in the optical receiver further introduced successively United DAC, device coordination and the controller, the control input of the control device emitter connected to the first output port of the controller, a second output port which is connected to the input of the DAC, the output device coordination is connected to the control input of the regulator, the output of which is connected to the input of the amplifier, the output of which is connected to the input of the detector, the output of which is connected to the ADC input, the controller input connected to the output of the receiving optical module.

The set of essential features of the claimed device eliminates the adjustment of the input level controller. Figure 1 presents a functional diagram of the transceiver device.

1 - electric device input;

2 - the control unit radiator (driver);

3 - emitter (led, semiconductor laser);

4 - output optical pole (split the optical connector;

5 - the fol;

6 - input optical terminal (detachable optical connector);

7 - receiving optical module (PROM);

8 - amplifier-limiter;

9 - device solutions;

10 - electrical output;

11 - regulator amplitude;

12 - power;

13 - the level detector;

14 - analog-to-digital Converter (ADC);

15 controller;

16 - sound emitter;

17 - analog Converter (DAC);

18 - device management;

19 - optical transmitter;

20 - optical receiver;

21 is a control block.

Figure 2 shows the timing diagram of automatic adjustment of the level of the input signal of the controller.

The inventive device operates as follows. The input digital information signals are received at the electrical input device 1 (figa). The control device emitter 2 generates a current modulation of the emitter 3. Information optical signal at the optical output pole 4 and later in the fol 5.

After passing through the fol 5 optical signal enters the input pole device 6 and then on the receiving optical module (PROM) 7. PROM is composed of a photodetector and an amplifier of the photocurrent. The PROM output is generated analog signal, which is then fed to the inputs of the two devices: amplifier-limiter 8 and the amplitude regulator 11. When ihoda amplifier-limiter 8 data signals fed to the input device 9, which restores the amplitude of the digital signals in the required format (figa).

From the output of the amplitude regulator 11, the information signals are sent to the amplifier 12, which increases the amplitude of the signals to the appropriate value. From the output of the amplifier 12, the signals are fed to the input of the level detector 13, which generates a DC voltage whose value is proportional to the amplitude of the input signal.

Received a constant level is input to the ADC 14 where it is converted to digital form and fed to the input of the controller 15. The controller according to a special algorithm carries out the processing of the input signal and selects from it the signal of unauthorized access attempts. In this case, the controller 15 generates an ALERT to the sound emitter 18 and removes the enable signal transmission to the control input of the control device of the emitter 2.

Automatic configuration when you enable the device as follows (figb). Digital input signal U₁after transmission over the fol, reception and conversion PROM 7 at the output of the regulator 11 is an exemplary view of that shown in the drawing (U₁₁). The amplitude of this signal depending on the transmission coefficient of the fol may have a different value. Accordingly, the DC level at the output of detector 13 (U_{13 _{can also take different values.}}

_{When enabled, the controller 15 generates a digital output signal that corresponds to the minimum gain of the controller 11. The digital signal is converted to analog form by DAC 17 and device matching 18 and is supplied to the control input of the regulator 11. After a delay exceeding the duration of the transient process in the controller 11, the amplifier 12, the level detector 13 and ADC 14, the controller compares the input signal with the lower value of the range of nominal values U_min. If the signal exceeds this value, the controller issues a corresponding control signal sound emitter 16, a warning about the need to reduce the depth of modulation of the information signal on the transmitting pole fotl. If the received input signal does not exceed U_minthe controller generates a digital output signal which corresponds to the maximum transfer rate of the controller 11. After the appropriate delay, the controller compares the input signal with the upper value of the range of nominal values U_max. If the signal is less than this value, the controller issues a corresponding control signal sound emitter 16, a warning about the need to increase the depth of modulation of the information signal for transmitting the m the fol pole. If the received input signal exceeds U_maxthe controller performs the change of the control signal by the gain controller 11 according to the method of steepest descent as long as the signal at the input of the controller, the maximum is close to the average value of the range of nominal values U_n. After this, the unit automatically switches to the transmit mode with the control of the fol.}

During operation periodically compares the input signal from the controller with a nominal value U_n(pigv). If the input value is outside the tolerance ΔU sets the nominal value of the signal by the method of successive approximation with a uniform increase or decrease the gain of the controller 11.

The ability to connect to the fol during a change of gear ratio regulator 11 is eliminated as follows. Before changing the transmission factor of the controller 11 in the individual registers of the controller stored value of the signal at the input of the controller U₀and the corresponding value of the digital signal U_y0control gain. After installing the nominal value input of the controller in the other registers are written, the new value of the input signal U₁and the corresponding EIT is giving digital control signal U _y1. Next, the controller generates a digital signal U_y0and compares the input signal with a previously stored value U₀. If the difference signal exceeds the allowable value, the controller generates an ALERT and prohibits the transmission of information. If there is a valid difference of the signals, the controller again generates a digital signal U_y1and compares the input value with U₁. When a valid differential signals, the controller puts the device in the transmission mode with the control of the fol. Otherwise, the controller generates an ALERT and prohibits the transmission of information.

To confirm the performance of the claimed device and the experimental determination of the parameters was assembled the layout of the transceiver unit. The control device emitter was performed on microwave transistors TA-2 and the current source of the operational amplifier (op-amp) UA and the transistor TE. As the emitter is used, the transmitting optical module HFBR-1312T. As the receiving optical module used HFBR-2316T. The amplifier-limiter and amplifier are performed on the chip LP, device solutions to the comparator SO.

The regulator amplitude represents a cascade of "common origin" duhsasana FET PA. The level detector is performed on the pulse on the same bridge 2D523B. The ADC and the controller is based on the microcontroller PIC16C717 with specially designed software. Sound emitter - piezosound control.

The layout device provided a digital data transmission with a speed of 125 Mbps standard 100Base-FX and control change values made losses in the fol-level of 0.05 dB, a high probability of detecting attempts to access the fol low the probability of false positives.

Transceiver device is protected fiber-optic transmission systems restricted information-containing optical transmitter that includes a control device emitter and emitter, the optical output pole of which is connected through fiber-optic transmission line with an input optical terminal of an optical receiver, comprising connected in series receiving optical module, the amplifier-limiter and device solutions, the output of which is the electrical output of the transceiver device, the control unit comprising an amplifier, a level detector and serially connected analog-to-digital Converter, a controller and a sound emitter, the input device control emitter is the entrance transceivers, characterized in that the optical is th receiver is additionally connected in series d / a Converter, device coordination and the controller, the control input of the control device emitter connected to the first output port of the controller, a second output port which is connected to the input digital to analogue Converter, the output device coordination is connected to the control input of the regulator, the output of which is connected to the input of the amplifier, the output of which is connected to the input of the detector, the output of which is connected to the input of analog-to-digital Converter, the controller input connected to the output of the receiving optical module.