SU1674208A1 - Optronic device for receiving and transmitting information - Google Patents

Abstract

The invention relates to the field of automation and computer technology and can be used for receiving and transmitting via optical communication lines, in converting devices of discrete automatic control and monitoring systems, computer memory devices. The purpose of the invention is to simplify the device. The device contains a light source 1, a group of photodetectors 2, a block 3 of frequency modulators, a block 4 of frequency separation of signals, a group of 5 information input elements, a group of 6 information output elements, photoreceivers 7 of a sync signal, communication elements 8 made in the form of optical fibers of the same length . The device provides information transmission over a fiber-optic communication line without retransmission. 1 il.

Description

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The invention relates to automation and computing and can be used for receiving and transmitting information via optical communication lines, in converting devices of discrete systems of automatic control and monitoring, transmission and reception of video images, computer memory devices.

The purpose of the invention is to simplify the device.

The drawing shows a block diagram of the device.

An optoelectronic device for receiving and transmitting information contains a light source 1, a group of photodetectors 2, a block 3 of frequency modulators, a block 4 of frequency separation of signals, a group of 5 information input elements, a group of 6 information output elements, a sync photoreceiver 7, communication elements 8 made in the form of optical fibers of the same length.

In the drawing, the numbers I, II N denote the totality of the elements providing the transmission and reception of information on N independent frequency channels with the corresponding spectral frequencies AI, X-2AN,, N p.

The device provides reception and transmission of information in one light guide via N independent information channels, and the device operation modes (reception and transmission) are independent.

Each of the N groups of photodetectors 2 is designed to convert a parallel code of light pulses received through this channel into a parallel code of electrical pulses on the output corresponding to this channel 1, 2n.

Unit 3 is designed to divide the radiation of the light source 1 into N discrete spectral Kansmyu AI, / 2,. AN, each of which is associated with a corresponding group of 5 input elements.

Unit 4 is designed to extract information relating to the corresponding channels from the general information flow coming from the communication line, as well as to perform the function of an optical adder in the information transfer mode.

Groups of 5 elements are designed to convert parallel binary electric codes into serial binary light codes transmitted to the communication line. Each group contains m 4 1 input elements, where m is the number of bits of the binary code. First entry

The group serves to generate a synchronization pulse in the code send.

Groups of 6 elements are designed to convert the successive binary codes of the light pulses in each channel received from the communication line into parallel binary codes of the light pulses and transmit them to the corresponding photodetectors 2.

Photodetectors 7 are designed for

extracting from the received code messages in each channel of synchronization pulses and generating at this moment a control signal to the elements of the information output

groups 6.

Communication elements 8, made in the form of optical fibers of the same length, are designed to transmit signals to the elements of the device and set the period of the light pulses in the code message. The period T follows is equal to the time of passage of a light pulse through an optical fiber.

The device works in two modes:

the transmission mode and the mode of receiving serial codes on the N information channels. As recognizable sequential codes, codes can be used which, by i parameters

(the number of bits, the period of the pulse, the length of the pulses) are similar to the portable codes. Formed by this device.

Since the formation of serial codes in each channel in the modes of transmission and reception of serial codes are similar, we consider the operation of the device using the example of the formation and reception of information in the first information channel.

In transmission mode depending on

pulsed information binary electric code arriving at the control inputs of the elements light emission with frequency AI from block 3

is transmitted to the corresponding communication elements 8. Since the time of passage of light pulses through the communication element 8 is equal to T, an information code will appear at the input-output device of the discharge of the information code

successively with the period of following T At the same time with the information code, a clock pulse is sent to the input of TI 1 of the first element of group 5. Thus, through the block 4 division of signals in line

A code sending of light pulses with the spectral frequency AI, which is a sequential information code with the period of the bits

T, at the beginning of which a clock pulse is transmitted.

In the reception mode, the sending of light pulses with the spectral frequency AI from the input-output device of the device arrives at block 4. where the selection of the channel corresponding to the frequency AI occurs. Next, the parcel through the elements of group 5 enters the input of elements of group b. At the moment when the clock pulse of the code parcel arrives at the photo receiver 7, the bits of the information code will appear in the elements of group 6. the corresponding bits of the information code. The photoreceiver 7 outputs a signal to the control inputs of the elements of group 6. As a result, the bits of the information code from the second outputs of the elements of group b are fed to the corresponding photodetectors 2, the output of which will generate a parallel code of electrical pulses corresponding to the received light code.

The device allows to reduce the power losses of the light pulses in the receive mode by N + 2 times, where N is the number of bits of the transmitted and received information codes. In this connection, the range of information transmission over the fiber-optic communication line without retransmission is significantly increased. In addition, the device has a simpler synchronization scheme, since it uses only one photodetector and one input element for each channel.

Claims (1)

Claims An optoelectronic device for receiving and transmitting information, comprising a light source whose output is optically connected to the input of the frequency modulators, the outputs of which are optically connected in each information channel to the first inputs of the information input elements, the frequency division unit, photo detectors, the second inputs of each information input element are the information input of the device, the input-output of the last information input element in each information channel is connected to the corresponding output of the frequency division unit, the outputs of the photodetectors are the outputs of the device, so that, for the sake of simplicity, A communication element, information output elements, a sync photoreceiver, information input element outputs are connected to the inputs of the corresponding photodetectors, the sync signal photoreceiver output is connected to the control inputs of the information output elements, the input / output of each previous information input element, except the last one. , through the corresponding communication element is connected to the input-output of the subsequent information input element, the input-output of each previous information output element and, besides the latter, is connected through the corresponding communication element to the input-output of the subsequent information output element, the input-output of the first information output element is connected to the input-output of the first element through the corresponding communication element input information, the input-output unit of the frequency division is the input-output device.