SU1677675A1 - Device for locating faults in optic cable - Google Patents

Abstract

The invention relates to a measurement technique and can be used to determine the distance to a damaged optical cable. The aim of the invention is to expand the field of application of the device due to the possibility of determining the distance to the damage of a multi-fiber optical cable. The goal is achieved by the fact that optical distributors 4.2 - 4.N, directional optical splitter 5, optical receivers 6.1 are inserted into the device containing the probe pulses generator 1, the optical transmitter 2, the delay line 3, the optical splitter 4 1 and the measuring unit 8. -6.N, NOT 7 element, switch 9, AND 10.1 - 10.N element, indication triggers 11.1 - 11.N, indicators 12.1 - 12.N and corresponding links. The device allows using a single optical transmitter to probe each fiber in a multi-fiber optical cable. 2 Il. 1L (Л С

Description

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The invention relates to a measurement technique and SV.Q.VJBT to be used to determine the distance to the point of damage of an on-cable cable.

The goal of Srepepi is to expand the area of the iris of a non-device device due to the possible gig interconnection to the location of the in / oplulokonnogo optical cable.

Hb I Mpi iceo.eHa device diagram; Figure 2 shows the diagrams citing the descriptions of the E, EGS.

I will arrange a generator of 1 probe pulses (GZI), an optical transmitter 2 PYRIA G zatoszhki, optical splitters 4/1 - 4.p, directed optical p; , Tjfb 5, optical receivers 6.1 - Zl., Element NOT 7, measurement unit 8, switch 9, elements 10.1 - 10.n, trip 11 11 - 11.p indications, indicators 12.1 - 12.5, with the first and second outputs 1 are connected respectively to the input of the optical transmitter 2 and the input of the line 3 of the delay, the output of which is connected to the first measuring gauge oo-oosa 8 measurement and through the NOT 7 element to the first inputs of the E10 elements. - Y. p., The second inputs of which are connected to the outputs of the corresponding optical receivers 6.1 - bp, the output of the optical transmitter 2 is connected to the input of the direction of the optical splitter 5, the outputs of which are connected to the inputs of the corresponding optical splitters 4.1 -4. which are connected to the corresponding outputs of the device, and their second outputs - to the inputs of the corresponding optical receivers 6.1 - bp, the output of each gold-blind And 10.1 - 10.n is connected to the corresponding input of the switch 9 and itCpsbHw by the input of the corresponding trigger 11 .1 to 11.n of the display, the output of which is connected to the input of the corresponding indicator 12.1 to 12.p, the output of the switch 9 is connected to the second input of the measuring unit 8, the second inputs of the trigger 11.1 to 11.p of the display are combined and connected to the output of the measuring unit 8.

Measurement unit 8 contains in series the trigger / trigger 13 and gauge 14, with the first and second inputs of the flip-flop 13 CPS-aineny, respectively, with the first and second inputs of the measurement block 8, the output of which is connected to the second output griggers 13.

The diagram shows the monitored multi-loop optical cable 15.

The device works as follows.

GZI 1 digs out the signals arriving at the optical transmitter 2 and the input of the 3 delay line. From the output of the optical transmitter 2 pulses are fed to the input

directional taper splitter 5, the number of outputs of which corresponds to the number of fibers of the optical cable 15. The directional optical splitter 5 distributes the pulse energy of the optical

0 transmitter 2 evenly across the fibers of the optical cable 15,

From the output of the delay line 3, the probe pulse arrives at the first input of the trigger 13 and sets it to the state

5 1. At the same time, from the second output of the flip-flop 13, the second inputs of the flip-flops 11.1 - 11.p receive a reset signal, thereby driving them to their initial state for operation. Reflected from the place of damage optical

0 fiber signal is received by the corresponding optical receiver 6 1 - bp from the output of which is fed to the second inputs of the elements And 10.1 - Yu.p.Signal GZI 1 through the line 3 delays and the element NE 7 enters

5 to the first inputs of elements And 10.1 - Yu. This is done with a chain of prohibition of receiving a probe pulse at the time of its passage through the optical flux distributor 4, since part of the energy of the probe pulse

0 branches off and through the second output of the optical splitter 4 is fed to the input of the optical receiver 6.1 - bp

From the output of the elements And 10.1 - Yu.p reflected signal is fed to the first input

5 of the corresponding trigger 11.1 to 11.n of the display and sets it to state 1. The signals from the outputs of the trigger 11.1 to 11.p of the display are fed to the inputs of the corresponding indicators 12.1 to 12.p, which signalize damage to the corresponding optical fiber. In addition, the signals from the outputs of the elements And 10.1 - Yu.p arrive at the INPUT of the switch 9 whose output is connected to the second input

5 flip-flops 13. A signal from the co-router 9 sets the flip-flop 13 to the state O.

The meter 14 of the measurement unit 8 measures the pulse duration of the trigger 13, thereby measuring the distance to the fault site directly in units of length.

Visually, indicators 12.1 - 12.n determine the number of the optical cable in which there is damage. Via

5 of the switch 9, only the signal reflected from the point of damage of the optical fiber of interest is connected to the second input of the trigger 13. By alternately connecting the signals from the outputs of the elements 10.1 - Y.p to the second input of the trigger 13, the distance to the damage in all the fibers of the optical fiber cable 15 can be determined. The device does not require additional adjustment before starting work.

Figure 2 shows timing diagrams for the operation of the device:

a — impulses probing and reflected from the site of damage;

b - delayed pulses at the first inputs of the elements And 10.1 - 10, p;

c — pulses reflected from the site of damage at the output of the optical receiver 6.1 - bp;

d is the signal at the output of the trigger 13, which arrives at the meter 14.

From the timing diagrams, it can be seen that the device determines the distance to the first fault site in each optical fiber. After elimination of the first inconsistency, the location of the subsequent cable is determined, and so on until the full restoration of the multi-fiber optical cable 15.

Thus, this device allows one to monitor the operability of a multi-fiber optical cable with a single optical transmitter and determine the distances to the damage sites of each optical fiber.

Claims (1)

Apparatus of the Invention A device for determining the distance to an optical cable damage site, comprising a probe pulse generator, an optical transmitter, a delay line, a measuring unit, a first optical receiver, and a first optical splitter, the first and second outputs of which are connected respectively to the first output of the device. and the input of the first optical receiver, the first and second outputs of the probe pulse generator are connected respectively to the input of the optical transmitter and the input of the delay line, the output to The second is connected to the first input of the measuring unit, characterized in that, in order to expand the field of application of the device, a directional optical splitter, n-1 optical splitters, n-1 optical receivers, n elements I, n indication triggers, n indicators, the switch and the element NOT, whose input is connected to the output of the delay line, and the output to the first inputs of the And elements, the second inputs of which are connected to the outputs of the corresponding optical receivers, the output of each element And connected to the corresponding input of the mutator and the first input of the corresponding / / triggering indicator, the output of which is connected to the input of the corresponding indicator, the output of the switch is connected to the second input of the measuring unit, the output of which is connected to the second inputs of the display triggering triggers, the output of the optical transmitter is connected to the input of the directional optical coupler, each of n outputs of which are connected to the input of the corresponding optical splitter, the first outputs of the n-1 optical splitter are connected to the corresponding outputs of the device, and the second outputs outputs - with the inputs of the corresponding optical receivers. l l l at Mr. J phage. 2 Editor N. Himchuk Compiled by V. Bykov Tehred M. Morgental l Proofreader S.Shevkun