JPS63246042A - Optical cable branching device - Google Patents

Abstract

PURPOSE:To realize an optical transmission line switching function by supplying either of current supplying cables of the 1st, 2nd or 3rd optical cables to an optical cables to an optical path switching section without needing a large-sized control circuit. CONSTITUTION:A supplying current of a feeder 22 of a 2nd optical cable 21 is supplied to an optical path switching section 2. In the connection state of the optical transmission line of the optical path switching section 4, one system 13-2 of the optical transmission line of a 1st optical cable 11 is connected to one system 23-1 of the optical transmission line of the cable 21. In this case, when the supplying current of the feeder 22 is interrupted, the optical transmission line 13-2 of the cable 11 is connected to the optical transmission line 33-2 of a 3rd optical cable 31. In this way, the optical cable branching device 100, when the supplying current of a branch is interrupted, switches automatically the optical transmission line connected to the interrupted branch into the normal branch automatically.

Description

[Detailed Description of the Invention] [Summary] An optical cable branch Wit that enables switching from one branch of an optical transmission line to the other branch, and the switching is performed by switching a power supply line attached to the optical cable. By controlling the power supply according to the power supply current, the configuration can be simplified, downsized, and made inexpensive and highly reliable.

[Industrial application field]

The present invention relates to an optical cable branching device.

[Conventional technology]

In optical submarine transmission systems, a single optical cable accommodates a large number of optical fibers, and one pair of optical fibers constitutes an upstream and downstream transmission line, and these many pairs of optical fibers constitute multiple optical fibers. The subsystem is composed of:

In this way, the optical cable can be branched into multiple subsystems underwater, for example, and then landed at multiple stations.

Conventionally, optical cable branching equipment used for the above purposes has been used to ensure a normal line between other branches when a failure occurs in a section at a branch destination, and to connect the above-mentioned line from another normal branch. Some devices are equipped with an optical fiber switching circuit that switches the lines connected to the faulty branch so that they are connected to each other, thereby ensuring a line with the highest possible capacity in the normal branch.

FIGS. 14A and 14B are diagrams showing a configuration example for optical fiber switching in a conventional optical cable branching device.

In FIG. 14A, 40 is a power feeding section, 45 is a receiving section, and 90
is a control section, and 80 is an optical fiber switching circuit. The receiving unit 45 receives power from the power supply unit 40, receives a switching instruction signal transmitted from a land-based optical terminal station via a normal optical cable, converts it into an electrical control signal, and converts it into an electrical control signal. By controlling this, the line connected to the faulty branch is connected to the line of another normal branch.

FIG. 14B shows that the optical cable from station A is branched to two stations, B and 0, and then sent overland.

14A shows a more detailed configuration example of the control unit 90 and optical fiber switching circuit 80 of FIG. 14A, which are used in a Y-shaped optical cable branching device for mutually performing optical transmission between 03 stations. In FIG. 14B, the control unit 90 includes a B-station command demodulation unit 91 and a C-station command demodulation unit 92,
The optical fiber switching circuit 80 receives two systems each consisting of a pair of optical fibers that transmit vertical optical signals from each of A, B, and 0 stations, and has six optical switches 81 to 86. Each system consisting of a pair of these optical fibers is connected to each other in a switchable manner. In the optical fiber switching circuit 80 of FIG. 14B, optical couplers 87 and 88 are provided on each of the receiving side optical fibers from each of the B and 0 stations, respectively, to connect these optical fibers. It is possible to branch and extract the optical signal input from the

In Fig. 14B, when all the optical cables leading to stations A, B, and C are normal, each optical switch 81 to 86 is set so that optical communication is possible via the route shown by the thick solid line in Fig. 14B. has been done. However, if something were to occur in the optical cable at the branch point leading to station C,
If station B detects this by some other means, station B will:
A switching instruction signal is transmitted to the optical cable branching device via an optical fiber line. This signal is taken out by the optical coupler 87 in the optical fiber switching circuit 80, photoelectrically converted by the receiving section 45, and sent to the switch 83 in the optical fiber switching circuit 80 by the B station command demodulation section in the control section 90. ~86
It is converted into a control signal for switching and sent out. This control signal switches the switches 83 to 86,
The optical fiber from station A, which was previously connected to the optical fiber from station C, is connected to the optical fiber from station B, which was also connected to another optical fiber from station C. In this way, instead of disconnecting the line with station C, a new line is secured between stations A and B.

[Problem that the invention seeks to solve]

As mentioned above, in conventional optical cable branching equipment,
When a fault occurs in a branch, in order to switch the optical transmission line that was previously connected to the faulty branch to another normal branch, it is necessary to connect it with a normal optical cable. A switching instruction signal is sent from one of the stations via the optical fiber line, and this signal is sent to the 14th A.
As shown in the figure and FIG. 14B, the optical switch 81 to 8
However, there was a problem in that a large-scale circuit was required to form the above-mentioned receiving section 45 and control section 90 used here.

The present invention was made in view of the above problems, and an object of the present invention is to provide an inexpensive and highly reliable optical cable branching device that realizes an optical transfer path switching function without requiring a large-scale control circuit or the like. The purpose is to

[Means for solving problems]

FIG. 1 shows the basic configuration of an optical cable branching device 100 of the present invention. In this figure, 12° 22 and 32 are power supply lines that feed the optical cable repeater, and 13-
1, 13-2, 23-1, 23-2, 33-1
, and 33-2 are each one optical transmission line,
Furthermore, 11.21 and 31 are respectively the feeder line 12, 22, or 32 and the optical transmission line 13-1 of the two systems.
and 13-2, 23-1 and 23-2, or 33-1 and 33-2. Reference numeral 100 denotes an optical cable branching device according to the present invention, and the optical cable branching device 100 includes an optical transfer path switching section 5 and a switching power supply section 4. The optical transfer path switching unit 5 includes first and second optical path switching units 2.3,
Two optical transmission lines 13-1 included in the optical cable 11,
13-2 has been introduced. The first optical path switching unit 2 connects one of the optical transmission lines 13-1 and 13-2 to two optical transmission lines 23-1 of the second optical cable 21,
23-2, or one of the two optical transmission lines 33-1 and 33-2 of the third optical cable 31; The second optical path switching unit 2 connects the other one of the two optical transmission lines 13-1 and 13-2 of the first optical cable 11 to the two optical transmission lines of the second optical cable 21. The other one of the transmission lines 23-1 and 23-2 23-1,
Or two optical transmission lines 3 of the third optical cable 31
3-1, 33-2, and is configured to be selectively switched to be connected to the other one 33-2.

By the way, according to the present invention, the first and second optical path switching sections 2 and 3 operate upon being supplied with current, and switch the connection state according to the supplied current.

Further, the switching power supply section 4 connects the first and second optical path switching sections 2.・For each of 3, the first, second,
Alternatively, one of the power supply currents from the power supply lines 12 , 22 , 32 of the third optical cables 11 , 21 , 31 is supplied.

The type of current applied to each of the first and second optical path switching units 2 and 3 to switch the optical path switching units 2 and 3 depends on the type of each optical path switching unit 2.3. Also,
Which feeder line 12 is connected to each of the two optical path switching units 2゜3?
, 22 and 32 shall be appropriately determined in advance.

[For production]

There are two types of optical path switching in the optical cable branching device 100 having the configuration shown in FIG. 1 as follows.

In the first case, the power supply current supplied from any terminal station to the power supply line 12, 22, or 32 of the first, second, or third optical cable is changed (for example, the positive current is cut off, the positive current is (e.g. switching to negative current). in this case,
By actively changing the power supply current from one terminal station,
The first or second optical path switching section 2 or 3 in the optical transfer path switching section 5 is operated to switch the connection state between the optical transmission paths.

In the second case, the second or third optical cable 21°31
If any of the power supply currents of the power supply lines 22 and 32 had been supplied with the power supply current by the switching power supply unit 4 until recently, the connection state will be automatically switched. . In FIG. 1, it is assumed that the feeding current of the feeding cotton 22 of the second optical cable 21 is being supplied to the first optical path switching section 2, and that the optical transmission path in the first optical path switching section 4 at this time is As shown by solid lines in FIG. 1, the connection state of the first optical transmission line of the first optical cable 11,
Assuming that the line 13-2 is connected to one line 23-1 of the optical transmission line of the second optical cable 21, the power supply current on the feeder line 22 of the second cable is cut off, and the first
The connection state in the optical path switching unit 2 is as shown by the broken line in FIG.
Switches to the one connected to 3-2. In this way, the optical cable branching device 100 configured as shown in FIG. 1 automatically switches the optical transmission line connected to the disconnected branch side to the normal branch side when the power supply current of a certain branch is disconnected. It can be set to switch. In either case, a large-scale circuit or the like is not required to realize the above configuration.

〔Example〕

FIG. 2 is a diagram showing the configuration of the first embodiment of the optical cable branching device of the present invention and the connection relationship with terminal stations at each branching destination. In this figure, 10.20 and 30 are terminal stations,
10 is station A, 20 is station B, and 30 is station 0.

Further, reference numerals 11, 21, and 31 are optical cables having power feed lines 12, 22, or 32, and optical transmission lines 13, 23, or 33, respectively. 9 is an optical repeater. and,
101 is a first embodiment of the optical cable branching device of the present invention.

Each of the above-mentioned terminal stations 10, 20, 30 includes an optical terminal device 14, 24, 34 comprising a transceiver, and
It has power supply devices F15, 25, and 35 for supplying power to the optical repeater 9 via power supply lines 12, 22, and 32.

The optical cable branch bag W 101 according to the present invention is
It has an optical transfer path switching section 6 and switching power supply sections 42 and 43, and the respective configurations are shown in FIG. 3A and FIG. 3B, which will be described next.

FIG. 3A is a diagram showing the configuration of the optical transfer path switching section 6 of FIG. 2. In this figure, 26, 27, 36, and 3
7 is a light breaker, 60 , 61 , 62 , 63 , 6
4 and 65 are optical couplers.
pler). In addition, the solid lines connecting each station in this figure indicate optical fiber lines. A pair of optical fiber lines 13-1 leading to the a, at end of A station, and a = 1 leading to the a, end
The paired optical fiber lines 13-2 each form one optical transmission line consisting of an upper and lower transmission line. Same <b+
one pair leading to the bz end, and b3. A pair leading to the b4 end,
The pair of optical fiber lines reaching the cl and c2 ends, and the pair of optical fiber lines reaching the c3 and c4 ends, each consist of an upper and lower transmission line.
It forms the optical transmission line of the system.

An example of the configuration of the optical breaker is shown in FIG.

In FIG. 4, 51 is a spring, 52 is an optical fiber line, and 5
3 is an electromagnet, and 54 is a slit. When a current flows in the electromagnetic coil of the electromagnet 53 in a certain direction or when no current flows, the position of the slit 54 changes to the position of the optical fiber 5.
It matches the position of 2.

Optical couplers distribute optical signals to multiple boats,
It combines optical signals from multiple ports, and uses the polarization multiplexing method that utilizes the polarization characteristics of communication light sources.
It couples light from multiple light sources into one optical fiber, or it couples light from one light source into multiple optical fibers. FIG. 5 shows the configuration of one example (two channels). Optical coupler 6 of FIG. 3A
At 0° 61 , 62 , 63 , 64 , and 65 , the state of distribution and merging of optical signals at each point is indicated by broken arrows.

Alternatively, an optical demultiplexer (multiplexer/demultiplexer) may be used instead of the optical coupler described above.

Figure 3B shows the optical interrupters 26, 27, 36 of Figure 3A.
.

37 electromagnet (53 in Figure 4) electromagnetic coil 2B,
29.

38, 39, and these electromagnetic coils 2B, 2
9, 38.

39 is shown. In FIG. 3B, 12, 22, and 32 are power feed lines from A station, B station, and 0 station, respectively, and 41 and 43 are power feed lines from the first and second stations.
A first switching power supply section 42 has Zener diodes connected in parallel at both ends of the series connection of the electromagnetic coils 28 and 29.
A second switching power supply section 43 having a parallel connection of Zener diodes is also connected to both ends of the series connection with 9, so that a constant current flows through each electric coil in the power supply state. It is composed of

Further, in FIG. 3B, the feeder lines 12, 22, and 32 from the A, B, and 0 stations are connected to the underwater earth at the optical cable branching device 101, respectively. That is, all the power supply lines are fed at one end.

By the way, in this embodiment, in the normal power supply state, the first and second switching power supply sections 42 and 43 in FIG. 3B have the following functions, as shown by the solid line arrows in FIG. 3B.
A current is supplied in the forward direction of the Zener diode. For this reason, electromagnetic coils 2B, 29 are connected in parallel to these Zener diodes.

No current flows through 38 and 39 under normal energization conditions.

On the other hand, each optical interrupter 26, 27, 28 in FIG. 3A
, 29 are set to cut off light as shown in Figure 3A'' when no current flows through the electromagnetic coils 28, 29, 38, and 39.In this case, from Figure 3A, As is clear, there are up and down transmission paths (a 4 → b 4, b 3 → a 3) between stations A and B, and (a 2 - c 2, c
The upstream and downstream transmission paths 1-a 1) are formed between the B station and the 0 station, and the upstream and downstream transmission paths (bl-c4.c3→b2) are formed between the B station and the 0 station.

Now, if the power supply current of the power supply line 22 from the B station is cut off and the 0 station recognizes this, in this embodiment,
Station 0 reverses the polarity of its feed current as shown by the dashed arrow in FIG. 3B.

As a result, a constant voltage is generated across the Zener diode of the second switching power supply section 43, and the electromagnetic coils 38, 3
A current flows through the optical interrupters 36 and 37, and light is allowed to pass through the optical interrupters 36 and 37. On the other hand, since no current flows through the electromagnetic coils 28 and 29 due to the power cutoff, the optical breaker 26
, 27 remain in the cutoff state. In this way, in FIG. 3A, between stations A and C, the original (a 2-=c 2
, c 1-=a 1) In addition to one system of up and down transmission paths, there is another up and down transmission path of (a4-c4.c3→a3).
A lineage is formed.

By the way, in FIG. 3A, the optical breaker 27 and the optical coupler 65 are used to connect the optical fiber line leading to the C1 end to the optical fiber line from the BL end or to the optical fiber line from the AL end. It can be considered as a switching part, and the optical interrupter 26 and optical coupler 64 are exactly the same. In addition, the optical fiber line leading to al and C2
The optical fiber line from the end, the optical fiber line from the BL end, the optical fiber line from the b2 end, the optical fiber line from the C1 end, and the optical fiber line from the C2 end each form a pair of upper and lower transmission lines. Because it forms
Optical interrupters 27 and 28 and optical coupler 64
and 65 can be considered to form an optical path switching unit for a pair of upper and lower transmission paths. This corresponds to the second optical path switching section 3 in FIG.

In exactly the same way, the four optical breakers 36 and 37 and the optical couplers 60 and 61 can be considered as optical path switching units for a pair of upper and lower transmission paths. This corresponds to the first optical path switching section 2 in FIG.

FIG. 6A is a diagram showing the configuration of an optical transmission line switching section in a second embodiment of the optical cable branching device of the present invention. Further, FIG. 6B shows the power supply switching circuit included in the second embodiment of the optical cable branching device of the present invention, as well as the first and second switching power supply sections 42 and 43, and the optical breaker 26 of FIG. 6A.
27 , 36 , 37 electromagnetic coils 28 , 29 , 38
, 39. FIG.

In FIG. 6A, optical fiber lines connecting stations A, B, and C, and optical couplers 60, 61, 62°6
3, 64, and 65 are exactly the same as those in FIG. 3A described above. However, in FIG. 6A, the optical interrupter 26
, 27 and 36, 37 are interchanged compared to their positions in FIG. 3A.

In addition, the first and second switching power supply parts 42, 43 and the electromagnetic coils 2B, 29, 38,
The connection with 39 is the same as that shown in FIG. 3B above.

Now, the newly provided power supply switching circuit 7 in the configuration shown in FIG. 6B will be explained. In Figure 6B, ? 1
, 72, 73, and 74 are the relay coils of the vacuum relay, respectively. 2. 3. and 4, respectively, and the relay contacts kl and 2. 3-1 and 3-2, and 4-1 and 4-2.

By the way, in the state shown in FIG. 6B, the power supply line 12 from station A has one wire connected to the relay coil and three wires connected to the relay contact.
-2, 2, and 3-1 are connected to the power supply line 32 via the second switching power supply unit 43, and reach station 0, but are not grounded in this open cable branching device. That is, power is supplied at both ends between A station←→C station. This applies voltages of opposite polarity to each other at both end stations in order to reduce the burden on the power supply device at a far-off end station (here, station A is assumed to be far away). In FIG. 6B, the current flowing through the relay coil 171 causes the relay contact 1 to close the normally open contact at one end of the relay coil 4 in FIG. 6B.

As a result, one end of the power supply line 22 from the B station is grounded at the optical cable branching device, and one end of the power supply line 22 from the B station can be supplied. When power is supplied from station B, a current flows through the relay coil 474, and the normally open contact 4-1, which is one end of the relay coil 474, is closed. At the same time, the normally closed relay contact 4-2 is opened. In this way, a power supply path is formed, and power can be applied to all of the power supply lines 12, 22, 32.

By the way, in the power supply switching circuit 7 of FIG. 6B, if B
Even if a power interruption occurs in the power supply line 22 on the station side, the 6B
There is no change in the connection of the feeder line from station A to station 0 in the figure.

Conversely, if a power interruption occurs in the power supply line 32 on the C station side, all lines between A and C stations will be disconnected, and the remaining B station will also be connected to A.
Communication with the station or B station becomes impossible. At this time, temporarily stop power supply to all stations A, B, and C, and
Reconnect power between stations B. In FIG. 6B, current flows through the relay coil 272, thereby causing the relay contact 2 to close the normally open contact at one end of the relay coil 3 in FIG. 6B. In this way, the power feed line 32 on the side of the C station that is causing the failure is insulated from the power feed line that runs from the A station to the B station.
Communication between stations A←→B becomes possible.

On the other hand, if we pay attention to the first and second switching power supply sections 42 and 43, in the normal power supply state, the electromagnetic coils 28 and 29 are connected in series or the electromagnetic coils 38 and 38 are connected in series.
A voltage is applied in the opposite direction of the Zener diode connected in parallel to both ends of the series connection of the electromagnetic coils 28 and 39.
Current flows through 29, 38, and 39.

In this embodiment, as shown in FIG. 6A, the optical circuit breakers 26, 27, 36, and 37 are all open in the unpowered state, but in the powered state, that is, the electromagnetic coil 2
When current flows through B, 29, 38, and 39, the sixth
The optical breakers 26, 27, 36, and 37 in Figure A are all in the cutoff state, that is, the same line as the optical transmission line switching unit 6 in Figure 3A in the first embodiment is connected to station A←→
It is formed between B station, B station←→C station, and C station←→A station.

By the way, in this embodiment, if the power supply line 22 on the B station side in FIG. 6B is disconnected, current will no longer flow through the electromagnetic coils 28 and 29, and the optical interrupters 26 and 27 in FIG. 6A will allow light to pass through. Become. On the other hand, since the optical interrupters 36 and 37 are still in the cut-off state, there is no signal between stations A and C (cl→al,
a2→c2), (c3→a3.

A line consisting of two upstream and downstream transmission lines a4-c4) is formed.

Even if the power supply line 32 on the C station side is disconnected, as is clear from the previous explanation of the operation of the power supply switching circuit 7, in exactly the same way as in the case of the power supply station on the B station side, this time the A, station → Two lines are formed between the B stations.

FIG. 7 is a diagram showing the basic configuration of the optical cable branch bag W 102 and its surroundings in a third embodiment of the present invention. The difference between this figure and FIG. , the correspondence is shown as to which of the second and third optical path switching units 2 and 3.1 the current is supplied to. The parts that feed power to these first, second, and third optical path switching units 2°3.1 are the first switching power supply unit 41, the second switching power supply unit 42, and the third switching power supply unit, respectively. 43.

The third optical path switching unit 1 connects one of the second optical cables 21
optical transmission line 23-1 of the system and 1 of the third optical cable 31
This is used to connect or disconnect the optical transmission line 33-1 of the system.

Here, it is assumed that the other optical transmission line 23-2 of the second optical cable 21 and the other optical transmission line 33-2 of the third optical cable 31 are connected. .

FIG. 8 shows the configuration of a third embodiment 102 of the optical cable branching device of the present invention and the optical terminal stations 10°20, 3 at each branching destination.
0 is a diagram showing a connection relationship with 0. FIG. What is different from the above-mentioned FIG. 2 among the contents shown in FIG. 8 is that the optical cable branching device 102 of the third embodiment is provided with a third switching power supply section 41. .

FIG. 9A is a diagram showing the configuration of the optical transmission line switching section 8 of FIGS. 7 and 8. FIG. In Figure 9A, 3 in Figure 7
Optical breakers 16 and 17 degrees are provided corresponding to the optical path switching unit 1 of , and the optical fiber line from the c1 end of station 0 can be connected to the optical fiber line towards the b4 end of station B. Similarly, optical couplers 66 and 68 are newly provided so that the optical fiber line from the b3 end of the B station can be connected to the optical coupler in the direction of the 0 station C2 end. There is. Optical couplers 66, 67, 6
8, the above-mentioned functions in 69 and the optical interrupter 16
, 17 correspond to the third optical path switching section l in FIG. 7, but the configuration is the same as that in FIG. 6A described above.

FIG. 9B shows the optical interrupter 16°17 of FIG. 9A mentioned above.
, 26 , 27 , 36 , and 37 , each of the electromagnetic coils 1B , 19 .

2B, 29, 38, 39 and the third, first, and second switching power supply units 41, 42, 43 are shown. In FIG. 9A, the third switching power supply part 41 is provided on the A station side power supply line 12 together with the electromagnetic coils 18 and 19, and the power supply lines 12 from A station, B station, 0 station,
22 and 32 are all single-ended, and A, B, and C
It has a symmetrical shape.

Figures 10A and 10B are Figures 9A and 9B.
This shows a normal power supply state in the configuration shown in the figure. In each of FIGS. 10A and 10B, the path of the optical signal and the path of the feeding current are shown by thick solid lines. Further, the arrows next to the first, second, and third switching power supply sections 41, 42, and 43 in FIG. 10B indicate the direction of the power supply current, and these directions are , and a Zener diode connected in parallel to both ends of the series connection of the electromagnetic coils 18 and 19, the series connection of 28 and 29, and the series connection of 38 and 39 in the third switching power supply parts 41, 42 and 43. The direction is opposite to that of the electromagnetic coils 1B, 19, 2B, 29.
, 38, and 39, a predetermined voltage is applied to both ends, and a current flows. At this time, as shown in FIG. 10A, the optical interrupter 16°1? , 26 , 27 , 36 , 3
7 are all in a cut-off state, and 10A
As shown by the thick solid line in the figure, station A←→station B, station B←
→C station, and... A line consisting of up and down transmission lines is formed between the station and the A station, respectively.

Figures 11A and 11B are similar to Figures 9A and 9.
In the configuration of Figure B, the power supply line 12 on the A station side is disconnected. At this time, the electromagnetic coil 18,
19, no current flows through the optical breaker 16 of FIG. 11A.
, 17 are enabled for light to pass through, and an optical signal path is formed as shown by the thick solid line in FIG. 11A. That is, A
When the power supply line 12 on the station side is disconnected, two optical transmission lines consisting of an upper and lower transmission line are formed between the B station and the C station.

Figures 12A and 12B are Figures 9A and 9B.
In the configuration shown in the figure, it is a diagram showing a state when the B station side power supply vA22 is disconnected. Electromagnetic coil for 2 days.

Since no current flows through 29, the optical breaker 26°2
7 is now able to pass light, and the path of the optical signal is shown by the thick solid line in Figure 12A, and two optical transmission lines consisting of up and down transmission lines are formed between the A station and the 0 station. Ru.

FIG. 13A and FIG. 13B show the state when the C-station side power supply line 32 is disconnected. The configurations in FIGS. 9A and 9B are completely symmetrical for the B and 0 stations. Therefore, in this case, two optical transmission lines are formed between the A station and the B station.

〔Effect of the invention〕

According to the present invention, an inexpensive and highly reliable optical cable branching device that realizes an optical transfer path switching function without requiring a large-scale control circuit or the like is provided.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the basic configuration of an optical cable branching device 100 of the present invention and its surroundings, and FIG. 2 is a first embodiment of the optical cable branching device of the present invention.
01 configuration, and each branch destination optical terminal station 10°20,
3A is a diagram showing the configuration of the optical transfer path switching section 6 in FIG. 2, and FIG. 3B is a diagram showing the connection relationship between the first and second switching power supply sections in FIG. Fig. 4 shows a structural example of an optical breaker, Fig. 5 shows an example of an optical coupler, and Fig. 6A shows the invention of the present invention. FIG. 6B is a diagram showing the configuration of the optical transfer path switching unit in the second embodiment of the optical cable branching device of the present invention, and FIG. 6B shows the power supply switching circuit 7, the first and second FIG. 7 shows the basic configuration of the third embodiment 102 of the optical cable branching device of the present invention and its surroundings. FIG. 8 is a diagram showing the configuration of the third embodiment 102 of the optical cable branching device of the present invention and the connection relationship with the optical terminal stations 10° 20 and 30 at each branching destination. FIG. 9B is a diagram showing the configuration of the optical transfer path switching unit 8 in FIGS. 7 and 8; FIG. 9B is a diagram showing the first, second, and third switching power supply units in FIGS. 7 and 8; Figure 10A is a diagram showing a normal power supply state in the configuration of Figure 9B; Figure 10B is a diagram showing the connection relationship with the electromagnetic coil of the optical breaker in the configuration of Figure 9A. Figure 11A is a diagram showing the path of the optical signal when the A-side power supply line is disconnected in the configuration of Figure 9A, and Figure 11B is the A-side power supply line in the configuration of Figure 9B. FIG. 12A is a diagram showing the path of the optical signal when the B-side power feed line is disconnected in the configuration of FIG. 9A, and FIG. 12B is a diagram showing the B-side power feed line in the configuration of FIG. 9B. FIG. 13A is a diagram showing the path of the optical signal when the C-side power supply line is disconnected in the configuration of FIG. 9A, and FIG. 13B is a diagram showing the C-side power supply line in the configuration of FIG. 9B. FIG. 14A is a diagram showing a configuration example for optical fiber switching in a conventional optical cable branching device, and FIG. 14B is a diagram showing a configuration example for optical fiber switching in a conventional optical cable branching device. It is. (Explanation of symbols) ■... Third optical path switching section, 2... First optical path switching section, 3... Second optical path switching section, 4... Switching power supply section,
5.6.8... Optical transfer path switching unit, 7... Power supply switching circuit, 9... Optical repeater, 10
, 20 , 30... Optical terminal station, 11... First optical cable, 21... Second optical cable, 31... Third optical cable, 12, 22, 32... Power supply line, 13 -1 , 13-2 , 23-1 , 23-2 , 3
3-1, 33-2... Optical transmission line, 14, 24, 34... Optical terminal equipment, 15, 25
, 35... power supply device, 16, 17, 26, 2
7, 36, 37... optical breaker, 18, 19
, 28 , 29 , 38 , 39 ... electromagnetic coil, 4
1, 42, 43... switching power supply section, 60-69.
...Optical coupler, 81-86... Optical switch. Figure 4 shows an example of the structure of an optical breaker 51...Spring 52...Figure 5 shows an example of an optical fiber line optical coupler 55...Grism with coupler film 56...Resegment tacle second Figure 26.2 shows the configuration of the optical transmission line switching unit 6 shown in Figure 26.2.
7, 36.37... Optical breaker 60.6+, 62,6
3.64.65... Figures 28.29, 38.39... Optical indication of the electromagnetic coils in Figures 7 and 8 showing the connection relationship between the optical coupler B station switching power supply unit and the electromagnetic coil. Figure +6.17 showing the configuration of the path switching unit 8.
26.27.36, 37... Optical breaker 62.63
, 66.67.68.69... Figure 9B showing the connection relationship between the optical coupler switching power supply unit and the electromagnetic coil of the optical breaker +8j9, 28, 29.3B, 39... Electromagnetic coil No. Figure 10A shows the optical signal path in a normal power supply state in the configuration of Figure 9A; Figure 10 shows a normal power supply state in the configuration of Figure 9B;
Figure 9A shows the optical signal path when the power supply line on the A side is disconnected in the configuration shown in Figure 9A. Figure 12A shows the path of the optical signal when the power feed line on the B station side is disconnected in the configuration of Figure 9B. FIG. 8 shows the route of the optical signal when the feeder line is disconnected. FIG. 9B shows the disconnected state of the C-side power feeder in the configuration of FIG. 9B. An example of a configuration for optical fiber switching in a conventional optical cable branching device Figure 14A shows an example of a configuration for fiber switching.Figures 81-86
...Light switch 87, 88...Gengaku Kagura

Claims (1)

[Claims] 1. A power supply line (12) and two optical transmission lines (13-1
, 13-2), each of which has a feeder line (22, 32) and two optical transmission lines (2
3-1, 23-2, 33-1, 33-2)
and a third optical cable (21, 31), and two optical transmission lines (1) of the first optical cable (11).
3-1, 13-2) is connected to the two optical transmission lines (23-2) of the second optical cable (21).
1, 23-2) or the third optical cable (31).
, 33-2), and the first optical cable (11).
3-1, 13-2), the other (13-1) is connected to the two optical transmission lines (23-1) of the second optical cable (21).
1, 23-2), or the two optical transmission lines (33-2) of the third optical cable (31).
1, 33-2) and a second optical path switching unit (3) that switches to connect to the other (33-1) of the first and second optical cables. The optical path switching units (2, 3) are configured to switch their connection states by being supplied with current, and each of the first and second optical path switching units (2, 3) has the following:
An optical cable characterized in that each optical cable is provided with a switching power supply part (4) that can supply a power supply current to any one of the power supply lines (12, 22, 32) of the first, second, or third optical cable. Branching device. 2. The first and second optical path switching parts (2, 3) are 1
An optical coupler or optical demultiplexer that couples the main optical transmission line and two optical transmission lines, and is provided on one of the two optical transmission lines and opens and closes depending on the supplied current. An optical cable branching device according to claim 1, comprising an optical breaker. 3. The first and second optical path switching units (2, 3) switch according to the supplied current to selectively connect one optical transmission path to one of the two optical transmission paths. The optical cable branching device according to claim 1, which is an optical switch. 4. The other (23-2) of the two optical transmission lines (23-1, 23-2) of the second optical cable (21) and the two optical transmission lines of the third optical cable (31). Road (33
2. The optical cable branching device according to claim 1, wherein the optical cable branching device connects the one (33-2) of (33-2) of (1) and (33-2). 5. One (23-1) of the two optical transmission lines (23-1, 23-2) of the second optical cable (21) and two optical transmission lines of the third optical cable (31). Road (33
-1, 33-2), the optical cable according to claim 4, comprising a third optical path switching section (1) that switches to connect or disconnect with the other (33-1). Branching device. 6. The first, second and third optical path switching units (1, 2,
3) is a claim consisting of an optical coupler that couples one optical transmission line and two optical transmission lines, and an optical breaker provided on one of the two optical transmission lines. The optical cable branching device according to item 4 or 5. 7. The first and second optical path switching units (2, 3) are 1
The optical cable branching device according to claim 4 or 5, which is an optical switch that selectively connects one optical transmission line to one of two optical transmission lines.