JPH0774683A - Cable terminator for optical submarine communication system - Google Patents

Abstract

PURPOSE:To enhance high safety at maintenance and inspection and to improve the workability of a cable fixing work and an optical fiber/feeder separate work or the like at a low cost with respect to a cable terminator provided to a cable land station of the optical submarine communication system. CONSTITUTION:A cable fixing section 10 fixing an optical submarine cable 1 to a cable termination frame 100, an optical fiber/feeder separate section 11 separating an end of the optical submarine cable 1 into a feeder 2-1 and a cable side optical fiber 41, a feeder connection section 13 connecting the separated feeder 2-1 and the station side power line 2-2, a fiber connection section 40 connecting the separated cable side optical fiber 41 and the station side optical fiber, a surge protection resistor 14 connecting in series to the station side power line 2-2, a feeder state monitor section 15 comprising an ammeter 15A and a voltmeter 15B, and a distribution compensation fiber accommodation section 80 accommodating a distribution compensation fiber 85 are mounted to the cable termination frame 100.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cable terminating device provided in a cable landing station of an optical submarine communication system having an optical submarine repeater with an optical amplifier.

The cable landing station of the optical submarine communication system is
A cable terminating device that fixes the optical submarine cable and separates the power supply line and the optical fiber on the cable side and provides a power supply status monitoring unit, a power supply device that supplies a predetermined direct current to the power supply line of the optical submarine cable, and an optical transmission end. It consists of station equipment and these equipments are mounted on separate racks.

On the other hand, in recent years, optical submarine repeaters have tended to use an optical amplifier for amplifying an input optical signal as it is to obtain an optical signal with a large output. The optical amplifier winds a rare earth-doped optical fiber (in the case of an erbium-doped optical fiber) having a length of several meters to several hundred meters in a coil shape, and transmits an optical signal having a wavelength near 1.55 μm.

Then, a pumping light having a wavelength of about 1.48 μm is input from a pumping light source provided in the optical submarine repeater to combine the pumping lights, and stimulated emission into the rare earth-doped optical fiber.
The direction of the stimulated emission light in this rare earth-doped optical fiber is
Since the direction of the signal light is exactly the same, the signal light is amplified.

Further, since the waveform is broken by the chromatic dispersion of the fiber which is the transmission line, it is necessary to insert a dispersion compensating fiber having a length of about 1000 meters into the optical fiber on the receiving side at the landing station.

On the other hand, with the extension of the optical submarine communication system, a current of 1 A and a voltage are used as amplification power for the optical submarine repeater.
It is required to supply DC power of 6000V to 8000V at the landing station, and in order to apply power of the opposite polarity to the polarity of the cable landing station on the other side, the polarity switching unit on the power supply line side Is required to be provided.

[0007]

2. Description of the Related Art FIG. 9 is a block diagram of a conventional cable terminating device. As shown in FIG. 9, a cable fixing unit 10 for fixing an optical submarine cable 1 to a cable terminating frame 150 and an end of the optical submarine cable 1 are connected to a feeder line 2-1 and a cable-side optical fiber 41 as shown in FIG. And the optical fiber / feed line separation unit 11 that separates the power line 2 and the power line connection unit 13 that connects the separated power line 2-1 and the power line 2-2 on the station side, and the separated optical fiber 41 on the cable side and the station A fiber connection unit 40 for connecting the side optical fiber 49, a surge protection resistor 14 connected in series to the office side power line 2-2, and a power supply status monitoring unit 15 including an ammeter and a voltmeter are mounted. There is.

Further, a polarity switching unit 16 connected to the surge protection resistor 14 is provided, and the power feeding device 300 provided on a frame other than the cable terminating frame 150 and the polarity switching unit 16 are connected by a station side power line. Further, in the cable terminating rack 150, a sea ground wire 5 is branched from the polarity switching unit 16 and its terminal is connected to the sea ground cable 6 and pulled out from the cable terminating rack 150.

The cable terminating rack 150 is provided with a sea ground switching unit 17 and a sea ground monitoring unit 18 between the polarity switching unit 16 and the sea ground cable 6. In addition to the power feeding parts, the power feeding device 300 is provided with a sea ground switching unit 317 and a sea ground monitoring unit 318 having exactly the same functions as the sea ground switching unit 17 and the sea ground monitoring unit 18 provided on the cable terminating frame 150.

On the other hand, the station side optical fiber 49 is pulled out from the optical transmission terminal station device 400 and is pulled into the cable terminating rack 150,
The cable side optical fiber 41 and the office side optical fiber 49 pulled out from the optical fiber / feed line separation section 11 are connected to the fiber connection section 40.
Are connected with.

In the past, since it was difficult to provide a space for accommodating the dispersion compensating fiber in the cable terminating rack 150, the dispersion compensating rack is provided between the cable terminating rack 150 and the optical transmission terminal equipment rack. A fiber accommodating box is installed and the dispersion compensating fiber wound in a coil shape is accommodated in the dispersion compensating fiber accommodating box.

[0012]

In the conventional landing station, both the cable terminating device and the power feeding device are provided with a sea earth switching portion and a sea earth monitoring portion which have the same functions.

Further, a dispersion compensating fiber accommodating box is installed between the cable terminating rack and the power feeder rack, and the dispersion compensating fiber is accommodated in the dispersion compensating fiber accommodating box. Therefore, there is a problem in that the cost of the landing station as a whole becomes high.

Also, an optical fiber to which a high voltage is applied
The maintenance and inspection work of the power supply line separation part and the power supply line connection part was dangerous. Further, during maintenance and inspection of the fiber connecting portion, the dispersion compensating fiber accommodating portion, etc., there is a possibility that light emitted from the optical connector enters the pupil and causes visual impairment.

On the other hand, for reasons such as weight, a polarity switching section, a sea ground switching section, a sea ground monitoring section, etc. are mounted below the cable terminating rack. For this reason, the optical submarine cable is pulled in from the upper part of the cable terminating rack, and there is a problem in that workability such as cable fixing work of the optical submarine cable and optical fiber / feed line separation work is poor.

The present invention was created in view of the above points, and is low in cost and highly safe during maintenance and inspection work.
It is an object of the present invention to provide a cable terminating device for an optical undersea communication system, which has good workability such as cable fixing work and optical fiber / feed line separation work.

[0017]

In order to achieve the above object, the present invention provides a cable provided in a cable landing station of an optical submarine communication system having an optical submarine repeater with an optical amplifier, as illustrated in FIG. In the terminating device, the optical submarine cable 1
Is fixed to the cable terminating rack, an optical fiber / feed line separating unit 11 for separating the end of the optical submarine cable 1 into a feeder line 2-1 and a cable-side optical fiber 41, and a separated feeder. The power supply line connecting part 13 for connecting the electric wire 2-1 to the office side power line 2-2 and the fiber connecting part 40 for connecting the separated cable side optical fiber 41 to the office side optical fiber are mounted on the cable terminal rack 100. .

Further, a surge protection resistor 14 connected in series to the power line 2-2 on the office side and a power supply status monitoring section 15 consisting of an ammeter and a voltmeter for monitoring the power supplied to the power supply line 2-1.
And a dispersion compensating fiber accommodating section 80 accommodating the dispersion compensating fiber 85 inserted between the cable side optical fiber 41 and the receiving side station side optical fiber, are mounted on the cable terminating rack 100.

As illustrated in FIGS. 3 and 5, a cable terminating case 21 that is detachably mounted is provided on a bar that horizontally extends inside the cable terminating rack 100, and one half of the cable terminating case 21 is The cable fixing portion 10, the optical fiber / feed line separating portion 11 and the surge protection resistor 14 are accommodated, and the fiber connecting portion 40 is accommodated in the other half of the cable terminating case 21.
It is assumed that the termination processing unit 20 is configured.

Further, the surge protection resistor 14 is connected to the power supply line connecting portion.
13 The structure is inserted in the vicinity. Further, as illustrated in FIG. 5, a sensor resistor 36 for voltage monitoring and a varistor 37 are mounted in the vicinity of the power supply line connecting portion 13 of the termination processing unit 20, and the cable terminating case 21 is connected to the monitoring low voltage line. Configure 34 to be withdrawn.

Alternatively, as illustrated in FIG. 4, a cover detachably mounted in the cable terminating rack so as to cover the front surfaces of the lids 28A and 28B that close the opening of the cable terminating case 21.
51 and limit switch installed on the back side of cover 51
52 and.

Then, by removing the cover 51, the limit switch 52 is activated to disconnect the power supply line connecting the power supply device 300 and the cable terminating rack 100. Alternatively, the front surface of the lid that closes the opening of the dispersion compensating fiber accommodating portion 80, the front surface of the lid that closes the opening of the optical fiber surplus length processing portion 90 mounted near the dispersion compensating fiber accommodating portion 80, and the opening of the termination processing portion 20. Cover 55 that detachably attaches to the front of the lid that covers the cable
And the limit switch 56 installed on the back side of the cover 55
And.

Then, by removing the cover 55, the limit switch 56 is actuated so that the optical signal line connecting the optical transmission terminal device 400 and the cable terminating rack 100 is disconnected.

Further, as illustrated in FIG. 8, an engineer key socket 59 is inserted and mounted in the circuit of the limit switch 52 and the circuit of the limit switch 56. When the engineer key is inserted into the engineer key socket 59, even if the covers 51 and 55 are removed, the power supply line connecting the power supply device 300 and the cable terminating rack 100 and the optical transmission terminal device 400 are connected. Make sure that the optical signal line connecting to the cable termination rack 100 is not broken.

[0025]

According to the present invention, the sea ground switching portion and the sea ground monitoring portion, which are conventionally provided in both the cable terminating device and the power feeding device, are not mounted on the cable terminating rack only on the power feeding device side. Further, the polarity switching section mounted on the cable terminating rack is moved to the power feeding apparatus rack, and the dispersion compensating fiber accommodating section is provided on the cable terminating rack.

Therefore, the cost of the entire landing station becomes low. On the other hand, a cable terminating case that can be detachably mounted is provided, and the cable fixing part, the optical fiber / feed line separating part and the surge protection resistor are housed in that half body, and further in the other half of the cable terminating case. By accommodating the fiber connection part, you can perform cable fixing work, optical fiber / feed line separation work, power supply line connection work, fiber connection work, etc. with the cable terminating case placed outside the cable terminating rack. The workability is improved because it can be carried out.

Further, by mounting the cable terminating case on the lower portion of the cable terminating rack, the optical submarine cable can be pulled into the cable terminating rack from under the floor, which facilitates the pulling operation of the optical submarine cable.

On the other hand, by inserting the surge protection resistor near the power supply line connecting portion, a part of the heat generated by the surge protection resistor can be radiated to the optical submarine cable, and the temperature rise of the cable terminating device can be suppressed. can do.

Further, in the vicinity of the power supply line connecting portion of the termination processing portion,
By mounting a sensor resistor and a varistor for voltage monitoring and pulling out the monitoring line from the cable terminating case, the connection line to the voltmeter of the power supply status monitoring unit becomes a low voltage.

That is, since the high voltage does not occur in the vicinity of the power supply status monitor, the safety of the operator is improved. Claim 5,
With the configuration of the sixth aspect of the invention, the risk of swinging to a high voltage at the time of maintenance and inspection of the cable terminating device is eliminated, and the risk of visual impairment is eliminated.

Further, with the configuration of the invention of claim 7, a veteran engineer can perform maintenance work while making use of a part of the transmission path.

[0032]

The present invention will be described in detail with reference to the drawings. The same reference numerals denote the same objects throughout the drawings.

FIG. 1 is a block diagram of the cable terminating device of the present invention, FIG. 2 is a circuit diagram of the present invention, FIG. 3 is a front view of the cable terminating rack of the present invention, and FIG. 4 is a side view of the cable terminating rack of the present invention. 5, FIG. 5 is a plan view of the termination processing unit, FIG. 6 is a view of the termination processing unit, (A) is a side view, (B) is a front view, FIG. 7 is a diagram of the optical fiber surplus length processing unit on the office side, and FIG. FIG. 3 is a diagram showing a security circuit.

In the figure, 100 is a cable terminating rack, 10 is a cable fixing portion for fixing the optical submarine cable 1 to the cable terminating rack 100, and 11 is a feeder line 2-1 by peeling off the coating on the end of the optical submarine cable 1. It is an optical fiber / feed line separating section that separates the optical fiber 41 from the cable side.

The illustrated optical submarine cable 1 has four cable-side optical fibers 41, two of which are for transmission and the other two are for reception. Reference numeral 40 is a fiber connecting portion that connects the separated optical fiber 41 on the cable side and the optical fiber 45 on the office side, and 13 is a separated feeder line 2-1 and power line 2-
2 is a power supply line connecting part, 80 is a dispersion compensating fiber accommodating part for accommodating a dispersion compensating fiber 85 having a length of about 1000 meters wound around a coil, and 14 is serially connected to the station side power line 2-2. It is a surge protection resistor (resistance value is about 30Ω) connected to.

Reference numeral 15 is a power supply status monitoring unit including an ammeter 15A and a voltmeter 15B. Reference numeral 90 denotes a station-side optical fiber that connects the optical transmission terminal device 400 and the dispersion compensating fiber accommodating section 80.
It is a station side optical fiber surplus length processing unit that accommodates a surplus length of 49 (4).

Mainly as shown in FIGS. 1 and 2, a cable fixing frame 100, a cable fixing part 10, an optical fiber / feed line separating part 11, a separated feeding line 2-1 and a station side power line 2-2.
A power supply line connecting portion 13 for connecting the cable side optical fiber 41 and the optical fiber connecting portion 40 for connecting the separated optical fiber 41 and the station side optical fiber 45 are mounted.

Further, the station side optical fibers (4 pieces) 49 drawn from the optical transmission terminal device 400 are drawn into the cable terminating rack 100, and the optical fiber extra length processing is performed on the upper portion of the cable terminating rack 100 as shown in FIG. Part 90 is installed.

As shown in FIG. 7, the optical fiber surplus length processing unit 90 has a partition plate in a box-shaped accommodating case 91 which is long in the left-right direction.
92 are provided, and three or four fiber holders 93 are arranged on the respective partition plates 92 so as to be on the same circumference, and the extra length portion of the local optical fiber 49 is held in a circular shape by the fiber holders 93. To be engaged.

Then, both sleeves on the front side of the housing case 91 are screwed to the front vertical frame column of the cable terminating rack to be mounted on the cable terminating rack 100. Then, each station-side optical fiber 49 after the extra length processing is introduced into the dispersion compensating fiber accommodating portion 80.

Fiber connection section 40 and optical fiber excess length processing section
A dispersion compensating fiber accommodating portion 80 is provided between 90, and the receiving side station side optical fiber 49 is via a dispersion compensating fiber 85,
It is connected to the station-side optical fiber 45 on the receiving side, which is pulled out from the fiber connection section 40.

The transmission-side station-side optical fiber 49 drawn into the dispersion compensating fiber accommodation section 80 is a transmission-side station-side optical fiber drawn from the fiber connection section 40 via an optical fiber having a short length. Connected to fiber 45.

The dispersion compensating fiber accommodating portion 80 will be described in detail below. The dispersion compensating fiber accommodating portion 80 accommodates the dispersion compensating fiber 85 in a box-shaped accommodating case, and the both sleeves on the front surface side of the accommodating case are screwed to the front vertical frame column of the cable terminating rack so as to terminate the cable. It will be installed on the rack 100.

Four optical adapters are mounted so as to penetrate the upper side plate of the housing case, and four other optical adapters are mounted so as to penetrate the lower side plate of the housing case. A plurality of drums around which dispersion compensating fiber 85 (about 1000 meters in length) is wound are detachably mounted in the housing case.

Then, the optical connector attached to one end of each of the two dispersion compensating fibers 85 is plugged into a corresponding optical adapter penetrating the upper plate, and the optical fiber extra length is provided outside the optical adapter. The optical connector of the optical fiber 49 on the receiving side pulled out from the processing unit 90 is plugged in.

Further, the optical connectors attached to the other ends of the two dispersion compensating fibers 85 are plugged into the corresponding optical adapters penetrating the lower plate, and the fiber connecting portions 40 are provided outside the optical adapters. The optical connector of the receiving-side optical fiber 45 on the receiving side is plugged in.

Further, the optical fibers for connecting the other two optical adapters of the upper side plate and the other two optical adapters of the lower side plate are housed. Then, the optical connectors of the two transmission side optical fibers 49 on the transmission side pulled out from the optical fiber surplus length processing unit 90 were respectively plugged in and connected to the optical adapter mounted on the upper plate, and mounted on the lower plate. Two transmitter-side optical fibers on the transmitting side pulled out from the fiber connection unit 40 to the optical adapter
49 optical connectors are plugged in and connected.

On the other hand, the polarity switching unit conventionally housed on the side of the cable terminating device serves as the polarity switching unit 316 mounted on the power feeding device rack as shown in FIGS. 1 and 2 in the present invention. . Further, the sea ground switching unit and the sea ground monitoring unit, which are conventionally provided also on the side of the cable terminating device, are abolished, and only the sea ground switching unit 317 and the sea ground monitoring unit 318, which are conventionally mounted on the power feeding device 300, are used.

In the cable terminating device of the present invention, after connecting the surge protection resistor 14 in series to the office side power line 2-2 connected to the power supply line connecting portion 13, the station side power line 2-2 is connected from the cable terminating rack 100. Polarity switching unit 31 of power supply device 300
Connected to 6.

[0050] Pull out the sea ground wire 5A from the power supply device 300 and pull it into the cable terminating rack 100.
Ammeter 15A is connected to 5A. In addition, station side power line 2-2
The voltmeter 15B of the power supply status monitoring unit 15 is connected via a sensor resistor 36 between the ground wire 5A and the ground wire 5A. A varistor 37 is connected in parallel with the voltmeter 15B.

After the power supply status monitor 15 is provided on the cable terminating rack 100 as described above, the sea ground wire 5A is again connected to the power supply device.
Returning to 300, the sea ground wire 5 is pulled out from the power feeding device rack to be connected to the sea ground cable 6.

As shown in FIG. 5, the above-mentioned cable terminating device is a cable terminating device in which the cable fixing part 10, the optical fiber / feed line separating part 11, the surge protection resistor 14 and the fiber connecting part 40 are made of metal or insulating material. Store in case 21 for
The termination processing unit 20 is used.

Then, as shown in FIG. 3, the optical submarine cable 1 is pulled into the cable terminating rack 100 from under the floor, and the terminating unit is moved upward from the lower portion of the cable terminating rack 100.
20, the dispersion compensating fiber accommodating section 80, and the optical fiber surplus length processing section 90 are mounted in this order, and the power supply status monitoring section 15 (that is, ammeter 15A and voltmeter 15B) is mounted on the top of the cable termination rack 100. .

The termination processing unit 20 will be described in detail below with reference to FIGS. A plate-shaped hooking bar 31 is provided so as to laterally bridge the lower part of the cable terminating rack 100, and a plate-shaped fixed bar 32 is provided in parallel below the hooking bar 31.

On the other hand, in the cable terminating case 21 which is composed of four side walls and a bottom plate and has an open front surface, a hole for drawing out the optical fiber 45 on the station side is provided in the upper side wall, and a hole for drawing in the optical submarine cable 1 is formed on the lower side wall and the station side A hole for drawing out the power line 2-2 is provided. Further, a connector 33 into which a monitoring line 34 is plugged in is attached to the lower side wall.

The cable terminating case 21 is constructed such that a lid 28B for closing it closes the opening of the upper half body and a lid 28A for fixing the opening of the lower half body with screws. As shown in FIG. 6, a pair of hook metal fittings 25 having lower openings are attached to the upper part of the bottom plate of the cable terminating case 21, and a fixing seat 26 for seating on the front side surface of the fixing bar 32 is attached to the lower part of the bottom plate. It is installed.

Therefore, the hook 25 is attached to the hook 31.
The cable terminating case 21 is fixed to the cable terminating case 21 by screwing the fixing seat 26 to the fixing bar 32 and fixing it.
It is detachably mounted on 100.

As shown in FIG. 5, the optical submarine cable 1 is drawn into the lower half of the recess of the cable terminating case 21,
The end of the optical submarine cable 1 is pressed and fixed to the cable terminating case 21 by screwing the holding metal fitting.

Then, the coating on the tip of the optical submarine cable 1 is peeled off, the feeding line 2-1 is exposed, and the holding metal fitting 22 made of a metal plate having good conductivity is screwed to fix the feeding line 2-1. It is pressed against the cable terminating case 21 to form the power supply line connecting portion 13.

Further, the surge protection resistor 14 is housed in the lower half of the recess, one end of which is connected to the holding metal fitting 22 by a conductive wire, and the other end of the surge protection resistor 14 is connected to the office side power line 2-2.
Are connected.

After fixing the station side power line 2-2 to the cable terminating case 21 by using a holding metal fitting, the station side power line 2-2 is pulled out from the cable terminating case 21 and further from the lower part of the cable terminating rack 100 to the underfloor. It is installed in the drop-in power supply system 300.

On the other hand, the sensor resistor 36 is housed in the lower half of the concave portion of the cable terminating case 21, one end of the sensor resistor 36 and the holding metal fitting 22 are connected by a lead wire, and the sensor resistor 36 is connected.
The other end of 36 is connected to the connector 33 via a lead wire.

The connector attached to the end of the monitoring line 34 is plugged into this connector 33, and the monitoring line 34 is pulled up to the upper part of the cable terminating rack 100 to make the cable terminating rack 10
It is connected to the voltmeter 15B mounted on the top of 0. In addition,
The power supply status monitoring unit 15 includes a varistor 37 in parallel with the voltmeter 15B.
Are connected.

Next, the fiber connecting portion 40 provided in the upper half of the concave portion of the cable terminating case 21 will be described. The power supply line 2-1 fixed by the power supply line connection part 13 is extended upward, the power supply line 2-1 is removed, and the optical fiber 41 on the cable side is taken out (optical fiber / power supply line separation part 11). The extra length is accommodated in the upper half.

Reference numeral 45 denotes a station side optical fiber in which an optical connector which is plugged into the optical adapter of the dispersion compensating fiber accommodating portion 80 is attached to one terminal. Then, each tip of the above-mentioned cable side optical fiber 41 and the end of the station side optical fiber 45 pulled into the cable terminating case 21 are spliced (connecting portion 42).

As described above, the cable terminating case 21 that is detachably mounted on the cable terminating rack 100 is provided, and the cable fixing portion 10, the optical fiber / feed line separating portion 11, the feed line connecting portion 13, the surge protection resistor are provided. By providing the terminating unit 20 accommodating the 14 and the fiber connecting unit 40, the cable terminating rack is
With the cable terminating case 21 taken out of the 100, fix the cable, separate the optical fiber and power supply line,
Since the work of connecting the power supply line and the work of connecting the fiber can be performed, these workability is good.

Further, when the cable terminating case 21 is mounted on the lower portion of the cable terminating rack 100, the optical submarine cable 1 can be pulled into the cable terminating rack from under the floor, which facilitates the pulling operation of the optical submarine cable.

Further, the surge protection resistor 14 is connected to the power supply line connecting portion 13
Since a part of the heat generated by the surge protection resistance is transferred to the optical submarine cable 1 and radiated from the optical submarine cable 1, the temperature rise of the cable terminating device is suppressed.

Further, since the sensor resistor 36 is housed in the cable terminating case 21 and the power supply line 2-1 and the voltmeter 15B are connected via the sensor resistor 36, the monitoring line 34 has a low voltage. Is being applied.

Therefore, even if the monitoring line 34 is touched, it is safe without electric shock or the like, and since the monitoring line 34 has a simple insulating structure, the wiring of the monitoring line 34 is easy. Moreover, the cost is low.

Regarding the security during maintenance and inspection, refer to FIGS.
Will be described with reference to. As shown in FIG. 4, the dispersion compensating fiber accommodating portion 80 and the optical fiber surplus length treating portion 90 are provided.
As shown in FIG. 1, the lids for closing the respective openings are not mounted so as to match the front surface of the cable terminating rack 100, and the dispersion compensating fiber accommodating portion 80 and An optical fiber surplus length processing unit 90 is mounted.

Reference numeral 51 is a cover made of, for example, a transparent resin plate that is detachably mounted in the cable terminating rack 100 so as to cover the front surfaces of the lids 28A and 28B that close the opening of the cable terminating case 21.

52 is a limiter installed on the back side of the cover 51 and operated by removing the cover 51 so that the power feeding line connecting the power feeding device 300 and the cable terminating rack 100 is disconnected. It is a switch.

Since high-voltage wiring components are mounted in the cable terminating case 21, the opening of the cable terminating case 21 is normally closed with the lids 28A and 28B. Therefore, the lids 28A and 28B of the cable terminating case 21 are removed to perform maintenance and inspection of the termination processing unit 20. According to the present invention, the cover 51 is removed before removing the lids 28A and 28B. There is.

When the cover 51 is removed, the power supply line connecting the power supply device 300 and the cable terminating rack 100 is disconnected. Therefore, even if the lids 28A and 28B are removed during maintenance and inspection of the termination processing section 20, the operator receives an electric shock. Will disappear.

Reference numeral 55 denotes a front surface of a lid that closes the opening of the dispersion compensating fiber accommodating portion 80, a front surface of a lid that closes the opening of the optical fiber surplus length processing portion 90 mounted near the dispersion compensating fiber accommodating portion 80,
And a cover made of, for example, a transparent resin plate, which is detachably mounted in the cable terminating rack 100 so as to commonly cover the front surface of the lid that closes the opening of the terminating unit 20.

56 is installed on the back side of the cover 55 and operates by removing the cover 51 so that the optical signal line connecting the optical transmission terminal equipment 400 and the cable terminating rack 100 is disconnected. It is a configured limit switch.

By the way, at the time of maintenance and inspection of the optical fiber surplus length processing section 90, the dispersion compensating fiber accommodating section 80, and the termination processing section 20, the optical connector must be removed from the optical adapter. When the optical connector is pulled out, the light is emitted from the optical connector and enters the pupil, causing visual impairment.

Therefore, according to the present invention, in order to remove the optical connector from the optical adapter, the cover 55 must be removed. When the cover 55 is removed, the limit switch 56 is activated to disconnect the optical signal line, so that even if the optical connector is removed and the optical connector is inadvertently looked into, the visual acuity does not occur.

On the other hand, as shown in FIG. 8, in the circuit of the limit switch 52 and the circuit of the limit switch 56,
The engineer key socket 59 is inserted and mounted. When the engineer key is inserted into the engineer key socket 59, even if the covers 51 and 55 are removed, the power supply line connecting the power supply device 300 and the cable terminating rack 100 and the optical transmission terminal device 400 are connected. The optical signal line connecting to the cable terminating rack 100 is configured so as not to be disconnected.

Therefore, there is an effect that a veteran engineer can carry out maintenance work while making use of a part of the transmission path.

[0082]

As described above, according to the present invention, the sea ground switching portion and the sea ground monitoring portion, which are conventionally provided in both the cable terminating device and the power feeding device, are not mounted on the cable terminating rack only as the power feeding device side. Also, by moving the polarity switching unit mounted on the cable terminating rack to the power feeder rack and providing the dispersion compensating fiber accommodation unit on the cable terminating rack, not only the cable terminating device but also the entire landing station It has the effect of reducing costs.

On the other hand, by providing a cable terminating case that is detachably mounted on the cable terminating rack, the work of fixing the optical submarine cable, the work of separating the optical fiber and the power supply line, the work of connecting the power supply line and the work of connecting the fiber, etc. It has the effect of improving the property.

Further, the optical submarine cable can be pulled into the cable terminating rack from under the floor, and the work of pulling in the optical submarine cable becomes easy. By inserting the surge protection resistor near the power supply line connecting portion, the temperature rise of the cable terminating device can be suppressed.

Further, the risk of swinging to a high voltage at the time of maintenance and inspection is eliminated, and the risk of visual impairment is eliminated.

[Brief description of drawings]

FIG. 1 is a block diagram of a cable terminating device of the present invention.

FIG. 2 is a circuit diagram of the present invention.

FIG. 3 is a front view of the cable terminal rack of the present invention.

FIG. 4 is a side view of the cable terminating rack of the present invention.

FIG. 5 is a plan view of a termination processing unit.

FIG. 6 is a diagram of the termination processing unit, (A) is a side view, and (B) is a front view.

FIG. 7 is a diagram of an optical fiber surplus length processing unit on the station side.

FIG. 8 is a diagram showing a security circuit.

FIG. 9 is a block diagram of a conventional cable terminating device.

[Explanation of symbols]

1 Optical submarine cable 2-1 Power supply line 2-2 Station side power line 5,5A Sea ground line 6 Sea ground cable 10 Cable fixing part 11 Optical fiber / power line separation part 13 Power line connection part 14 Surge protection resistor 15 Power supply status monitoring part 15A Ammeter 15B Voltmeter 16,316 Polarity switching part 17,317 Sea ground switching part 18,318 Sea ground monitoring part 20 Termination part 21 Cable terminating case 22 Holding metal fitting 28A, 28B Lid 31 Hooking bar 32 Fixed bar 34 Monitoring line 36 Sensor resistance 37 Varistor 40 Fiber connection part 41 Optical fiber on cable side 45,49 Optical fiber on station side 51,55 Cover 52,56 Limit switch 59 Engineer key socket 80 Dispersion compensation fiber accommodating part 90 Optical fiber surplus length processing part 100 Cable end rack 300 Power supply device 400 Optical transmission terminal device

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI technical display location H04B 10/12

Claims (7)

[Claims] 1. A cable terminating device provided at a cable landing station of an optical submarine communication system having an optical submarine repeater with an optical amplifier, wherein a cable fixing portion (10) for fixing the optical submarine cable (1) to a cable terminating rack is provided. , An optical fiber / feed line separation section (11) for separating the end of the optical submarine cable (1) into a power supply line (2-1) and a cable side optical fiber (41), and the separated power supply line ( 2-1) to the power line (2-2) on the office side, the power supply line connection part (13) to be connected, and the separated fiber optical fiber (41) to the station side optical fiber 40) and surge protection resistor (1) connected in series with the station side power line (2-2).
4) and a power supply status monitoring section (15) consisting of an ammeter and a voltmeter for monitoring the power supplied to the power supply line (2-1), the cable side optical fiber (41) and the receiving side station. An optical submarine communication system characterized in that a dispersion compensating fiber (85) to be inserted between a side optical fiber and a dispersion compensating fiber accommodating section (80) for accommodating the dispersion compensating fiber is mounted on a cable termination rack (100). Cable termination equipment. 2. A cable terminating case (21) that is detachably mounted on a bar that horizontally extends inside the cable terminating rack (100), and the cable terminating case (21) is a cable fixing part (21). Ten),
Optical fiber / feed line separation part (11) and surge protection resistor (14)
In one half, and the other half of the
The cable terminating device for an optical undersea communication system according to claim 1, which accommodates 0). 3. The surge protection resistor (14) has a power supply line connecting portion (1).
3) The cable terminating device for an optical undersea communication system according to claim 1 or 2, which is inserted in the vicinity. 4. A voltage monitoring sensor resistor (36) and a varistor (37) are provided in a cable terminating case (21) for connecting a power supply line.
The cable terminating device for an optical undersea communication system according to claim 2, wherein the cable terminating device is mounted in the vicinity of the cable terminating device, and the monitoring line (34) is pulled out from the cable terminating case (21). 5. The cable terminating case (2) according to claim 2,
A cover (51) that is detachably mounted in the cable terminal rack so as to cover the front surface of the lid (28A, 28B) that closes the opening of 1), and a limit switch installed on the back side of the cover (51).
(52), the limit switch (52) disconnects the power supply line connecting the power supply device (300) and the cable terminal rack (100) when the cover (51) is removed. A cable terminating device for an optical submarine communication system characterized by the above. 6. A front surface of a lid that closes the opening of the dispersion compensating fiber accommodating portion (80), and a lid that closes the opening of an optical fiber surplus length processing portion (90) mounted near the dispersion compensating fiber accommodating portion (80). (55) which is detachably mounted in the cable terminating rack so as to commonly cover the front surface of the cover and the front surface of the lid that closes the opening of the terminating unit (20), and the back side of the cover (55). Limit switch installed in
(56), the limit switch (56) disconnects the optical signal line connecting the transmission terminal equipment (400) and the cable terminal rack (100) when the cover (55) is removed. A cable terminating device for an optical undersea communication system. 7. The limit switch (52) according to claim 5.
The engine key socket (59) inserted and mounted in the circuit of claim 6 and the circuit of the limit switch (56) of claim 6.
The engineer key socket (59) is provided with a power supply device (300) and a cable termination rack even if the cover (51, 55) according to claims 5 and 6 is removed when the engineer key is inserted. A cable for an optical submarine communication system characterized in that a power supply line connecting (100) and an optical signal line connecting an optical transmission terminal device (400) and a cable terminal rack (100) are not disconnected. Termination device.