JPH08256117A - Optical transmission terminal equipment - Google Patents

Abstract

(57) [Abstract] [Purpose] In relation to the landing station for optical submarine cables, especially for the optical transmission terminal equipment equipped with an optical amplifier,
(EN) Provided is an optical transmission terminal station device which has a simple optical connection, is easy to assemble, is small in size, and is easy to maintain and inspect. [Configuration] Receiving side optical amplification section 10, receiving section 20, E / O conversion section
Printed wiring boards 10A, 20A, 30A, 40A, 50A, 60A on which 30, O / E converter 40, transmitter 50, and optical amplifier 60 on the transmitter side are mounted, respectively.
And a box-shaped shelf 700 having a backboard B with connectors and optical connectors arranged on the back bottom and an open front,
Printed wiring boards 10A, 20A, 30A, 40A, 50A, 60 to be plugged into the backboard B connector and optical connector
The printed wiring boards 10A, 20A, 30A, 40A, 50A, and 60A, each of which has a connector mounted on A and an optical connector, are housed and mounted in the shelf 700 in parallel so that they can be inserted and removed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cable landing station for an optical submarine cable, and more particularly to an optical transmission terminal station device equipped with an optical amplifier.

In order to transmit high-speed, large-capacity digital signals over long distances, in recent years, rare-earth (eg erbium) -doped optical fibers for transmitting optical signals with wavelengths around 1.55 μm having lengths of several meters to several hundred meters have been used. , An optical amplifier that amplifies the optical signal by stimulated emission of a rare-earth-doped optical fiber by inputting and combining pumping light with a wavelength of about 1.48 μm from a pump light source (for example, a laser diode for pumping) to an optical submarine repeater. Incorporated and used.

Accordingly, recently, it has been required to incorporate such an optical amplifier also in the optical transmission terminal equipment of the landing station.

[0004]

2. Description of the Related Art An optical transmission terminal station device having an optical amplifier will be described with reference to FIGS.

As shown in FIG. 5, the cable landing station interposed at the joint between the optical submarine cable 1 and the land optical cable 6 has a cable terminating device 2 for fixing the terminal end of the optical submarine cable 1 to supply power, and a receiver. , An optical transmission terminal station device 3 provided at the rear stage of the cable terminating device 2 including a transmission unit, a connection terminal station device 4 provided at the rear stage of the optical transmission terminal station device 3, and a rear stage of the connection terminal station device 4. And a land-side terminal device 5 to which a land optical cable 6 is connected.

The optical transmission terminal device 3 comprises a receiving system and a transmitting system. The reception system and the transmission system each have a plurality of optical transmission lines. The reception system includes a reception side optical amplification unit 10 connected to the cable terminating device 2, an E / O conversion unit 30 connected to the connection terminal device 4, a reception side optical amplification unit 10, and an E / O conversion unit 30. It is composed of a receiving unit 20 interposed between.

The transmission system is connected to the connection terminal device 4 O
The / E conversion unit 40, the transmission side optical amplifier 60 connected to the cable terminating device 2, and the transmission unit 50 interposed between the O / E conversion unit 40 and the transmission side optical amplifier 60.

The optical transmission terminal equipment is incorporated into one shelf or the like as a system unit, and a plurality of system units are mounted on a rack as shown in FIG. From the bottom of the rack, the power transmission board 9, the intake / exhaust air unit 7K, the system unit 7, the intake / exhaust air unit 7K, the system unit 7, ... The common unit 8 is mounted on the upper stage of the wind unit 7K.

Generally, to cool the system unit 7, there are two types, a forced air cooling method using a fan and a natural air cooling method without a fan. However, the forced air cooling method requires manpower for maintenance. The cable landing station is
As mentioned above, the air intake / exhaust unit 7K, which does not have a fan, is installed and a natural air cooling system is adopted.

FIG. 7 is a circuit diagram of an optical transmission terminal station device.
In the figure, the solid line connecting the parts indicates an optical fiber, the square mark between the solid lines indicates the optical connector, and the black dot between the solid lines indicates the splice part. B indicates a backboard.

The receiving side optical amplifier 10 is optically connected to the optical coupler 11, which receives the output (optical signal) of the cable terminating device via the optical fiber-optical connector-backboard B-optical fiber. Output (optical signal) to optical fiber
Optical connector-backboard B-optical amplifier circuit 15 for sending to the receiving unit 20 via an optical fiber, PLD (pumping laser diode) 16, and optical amplifier unit for receiving side connected to the branch path side of the optical coupler 11. It is composed of a PD (photodiode) 12 for monitoring an input (optical signal) received by 10.

The optical amplifier circuit 15 includes a pre-stage module 15-1 for inputting and multiplexing pumping light having a wavelength of about 1.48 μm from a P · LD (pumping laser diode) 16 and 1.55 μm of several meters to several hundred meters. Rare earth-doped optical fiber 15-2 that transmits optical signals of near wavelengths and rare earth-doped optical fiber
Post-stage module 15 for optically coupling 15-2 and the output optical fiber
-3 and.

The receiving section 20 receives the output (optical signal) of the receiving side optical amplifying section 10 through an optical fiber-optical connector-backboard B-optical fiber, and an optical coupler 21.
And an optical attenuator 25 connected to the optical attenuator via an optical fiber, and an optical signal sent from the optical attenuator 25 is converted into an electric signal, and an electric signal output is sent to the E / O converter 30 via the backboard B. It is composed of a PD (photodiode) 26 and a PD (photodiode) 22 which is connected to the branch path side of the optical coupler 21 and monitors an input (output of the receiving side optical amplification section 10).

The optical attenuator 25 attenuates the optical power amplified by the receiving side optical amplifying section 10 to a low power which can be accepted by the E / O converting section 30. The E / O conversion unit 30 includes an LD (laser diode) 31 that converts light wavelengths suitable for an optical transmission line on the land side, and inputs the output (electrical signal) of the reception unit 20 via the backboard B, LD (laser diode) 31
E / O conversion with optical signal of optical fiber-optical connector-
Backboard B-Sending out to the terminal equipment for connection via the optical fiber.

The O / E converter 40 outputs the output (optical signal) of the terminal equipment for connection to the optical fiber-optical connector-backboard B.
It is to be received via an optical fiber, O / E converted by a PD (photodiode) 41, and output (electrical signal) is sent out to a transmitter 50 via a backboard B.

The transmitter 50 converts the output (electrical signal) of the O / E converter 40 received via the backboard B into an optical signal and converts it into an optical wavelength suitable for the optical transmission line on the sea side.
(Laser diode) 51 and modulator 52, an optical coupler 53 connected to the modulator 52 via an optical fiber, and an optical coupler 21.
And a PD (photodiode) 54 which is connected to the branch path side for monitoring the output (the output of the transmitter 50).

The transmitting side optical amplifier 60 includes an optical coupler 61 for receiving the output (optical signal) of the transmitting section 50 through an optical fiber-optical connector-backboard B-optical fiber, and an optical coupler 61.
And an optical amplifier circuit 65 for transmitting an output (optical signal) to the connecting terminal device via an optical fiber-optical connector-backboard B-optical fiber, and a PLD (pumping laser diode) 66. And a PD (photodiode) 62 connected to the branch path side of the optical coupler 61 and monitoring the input (optical signal) received by the transmission side optical amplifier 60.

The optical amplifier circuit 65 includes a pre-stage module 65-1 for inputting and combining pumping light having a wavelength of about 1.48 μm from a P · LD (pumping laser diode) 66, and 1.55 μm of several meters to several hundred meters. Rare earth-doped optical fiber 65-2 that transmits optical signals of near wavelengths and rare earth-doped optical fiber
Rear module 65 that optically couples 65-2 with the output optical fiber
-3 and.

[0019]

As described above, the receiving system of the receiving side optical amplifying section, the receiving section, and the E / O converting section, and the transmitting system of the O / E converting section, the transmitting section, and the transmitting side optical amplifier. The optical transmission terminal equipment consisting of the following is required to have the following.

(1) Easy to assemble and compact. (2) Simple electrical and optical connections between each part. (3) Maintenance and inspection of each part is easy.

(4) Compared with the conventional optical transmission terminal equipment that does not perform optical amplification, the optical amplification optical transmission equipment uses a large number of optical modules, and the optical modules are connected by optical fibers. Capable of compactly containing rare earth-doped optical fibers as long as a meter to several hundred meters.

The present invention was created in view of the above points, and the optical transmission terminal station device is simple in electrical and optical connection between the respective parts, easy to assemble and compact, and easy to inspect and maintain. Is intended to provide.

[0023]

In order to achieve the above object, the present invention provides a receiving side optical amplifying section as illustrated in FIG.
10, a receiving unit 20, an E / O conversion unit 30
An optical transmission terminal station device of a landing station, comprising a transmission system including an E conversion unit 40, a transmission unit 50, and a transmission-side optical amplifier 60, a printed wiring board 10A having a reception-side optical amplification unit 10, and a reception unit. Printed wiring board 20A with 20 mounted, printed wiring board 30A with E / O converter 30 mounted, printed wiring board 40A with O / E converter 40 mounted
A printed wiring board 50A equipped with a transmitter 50, and a printed wiring board 60A equipped with a transmitter optical amplifier 60.

Also, a box-shaped shelf 700 having a backboard B on which a connector and an optical connector are arrayed is provided on the inner bottom surface and the front surface is opened, and printing is performed so as to be plugged into the connector and the optical connector of the backboard B. Wiring board 10A,
It is equipped with connectors and optical connectors mounted on 20A, 30A, 40A, 50A, 60A.

Each printed wiring board 10A, 20A, 30A, 40A, 50
The A and 60A are configured so that they can be inserted into and removed from the shelf 700 in parallel and mounted in parallel. As illustrated in FIG. 2, the receiving unit 20 includes a printed wiring board 20A on which an electric circuit system is mounted, a substrate 201 which is mounted on the printed wiring board 20A in a stacked manner via posts to mount an optical circuit system, Consists of.

Further, the PD assembly 26A, the power supply circuit and the alarm system circuit are mounted on one side of the substrate 201,
It is assumed that the other optical component and the splice container 205 are mounted on the other one surface side.

As illustrated in FIG. 3, the transmitting unit 50 includes a printed wiring board 50A on which an electric circuit system is mounted and a substrate which is mounted on the printed wiring board 50A in a stacked manner via posts to mount an optical circuit system.
It is composed of 501 and.

Further, the modulator 5 is provided on one side of the substrate 501.
2, It is assumed that the power supply circuit and the alarm system circuit are mounted, and the other optical component and the splice container 505 are mounted on the other side.

As illustrated in FIG. 4, the receiving side optical amplification section 10
Is a case consisting of a printed wiring board 10A on which an electric circuit system is mounted and a shallow box-shaped metal plate mounted on the printed wiring board 10A.
100 and the upper board 1 housed in the case 100 through the support column
02 and.

A PLD (pumping laser diode) assembly 16A and pre- and post-stage modules 15-1 and 15-3 of an optical amplifier circuit are mounted on a bottom plate 101 of a case 100, and an optical amplifier is mounted on an upper substrate 102. The rare earth-doped optical fiber 15-2 of the circuit and the splice container 105 are mounted.

The optical amplifier on the transmitting side has the same structure as the optical amplifying section 10 on the receiving side.

[0032]

According to the present invention, the receiving side optical amplifying section, the receiving section, the E / O converting section, the O / E converting section, the transmitting section and the transmitting side optical amplifier are mounted on the respective printed wiring boards, and the respective printed wiring boards are mounted. It is configured so that it can be inserted into and removed from the shelves in parallel and accommodated in the shelf.

With the above-mentioned structure, when each printed wiring board is inserted into the corresponding guide, the electrical connection between the respective parts of the transmission system is made through the pattern of the backboard, and the optical connection between the respective parts is established. Connection is performed via an optical fiber wired on the back side of the backboard.

Further, the electrical connection between the respective parts of the receiving system is made through the pattern of the backboard, and the optical connection between the respective parts is made through the optical fiber wired on the back surface side of the backboard.

Since it is not necessary to make electrical wiring and optical wiring as described above, the assembling work of the optical transmission terminal station device is simple. Further, by removing the printed wiring board from the shelf, it is possible to perform maintenance and inspection work for each part independently.

Since the receiving section and the transmitting section have a two-stage structure of a printed wiring board and a board, an electric circuit system is mounted on the printed wiring board, and an optical circuit system is mounted on the board, each circuit system has its own structure. Easy to assemble and inspect.

The optical amplifiers on the receiving and transmitting sides have a case mounted on a printed wiring board on which an electric circuit system is mounted, and a laser diode assembly for pumping and front and rear modules of the optical amplifier circuit mounted on the bottom plate of the case. However, since the splice container and the rare earth-doped optical fiber are mounted on the upper substrate provided in a two-stage structure in the case, the long rare earth-doped optical fiber is wound inside the case in a planar state with a large radius. The receiving side optical amplifying section and the transmitting side optical amplifying section are thin. Therefore, miniaturization of the shelf that accommodates the optical transmission terminal device is promoted.

[0038]

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

FIG. 1 is a perspective view of an embodiment of the present invention, FIG. 2 is a view of the receiving portion of the present invention, (A) is a side view, (B) is a plan view of the back surface of the substrate, and FIG. In the figure of the part, (A) is a side view, (B)
FIG. 4 is a plan view of the back surface of the substrate, FIG. 4 is a diagram of an optical amplification section of the present invention, (A) is a partially cutaway side view, and (B) is a partially cutaway plan view.

In FIG. 1, 700 is a receiving side optical amplification section 1
0, a receiving unit 20, an E / O conversion unit 30
It is a box-shaped shelf with an open front surface, which accommodates the optical transmission terminal equipment of the landing station, which has a transmission system including an E conversion portion 40, a transmission portion 50, and a transmission side optical amplifier 60. A large number of guides for inserting the upper and lower edges of the printed wiring board housed in the shelf 700 are provided so as to face the upper and lower plates of the shelf 700.

A backboard B is attached to the bottom bottom surface of the shelf 700, and connectors and optical connectors are provided on the backboard B corresponding to the respective printed wiring boards accommodated in the shelf 700. The predetermined optical connectors are connected by an optical fiber wired on the back side of the backboard B.

Reference numeral 10A is a printed wiring board on which the receiving side optical amplification section 10 is mounted, 20A is a printed wiring board on which the reception section 20 is mounted, and 30A is a printed wiring board on which the E / O conversion section 30 is mounted. . 40A is a printed wiring board equipped with the O / E conversion unit 40, and 50A is a printed wiring board equipped with the transmission unit 50.
Is a printed wiring board equipped with a transmitter-side optical amplifier 60.

Further, 800A is a printed wiring board on which the common section 8 shown in FIG. 6 and the interface circuit 800 between the above-mentioned sections are mounted, and 900A is from the power supply board 9 shown in FIG.
It is a printed wiring board that receives a power supply of 48V and has a power supply circuit 900 that supplies ± 5V of power to each of the above-mentioned parts.

A printed wiring board 40A equipped with a transmission system O / E conversion section 40, a printed wiring board 50A equipped with a transmission section 50, and a printed wiring board 60A equipped with a transmission-side optical amplifier 60 are arranged in this order as a guide for the shelf 700. , And the respective connectors and optical connectors are plugged into the corresponding backboard B connector and optical connector.

Further, a printed wiring board 30A having the E / O conversion unit 30 of the receiving system, a printed wiring board 20A having the receiving unit 20 and a printed wiring board 10A having the receiving side optical amplification unit 10 are arranged in this order. Insert into the guide of shelf 700, connect each connector, optical connector to corresponding connector of backboard B,
It is plugged into an optical connector.

Printed wiring board 900A equipped with power supply circuit 900
Is inserted into a guide on one side plate of the shelf 700, and the connector is plugged into the corresponding connector of the backboard B. The printed wiring board 800A equipped with the interface circuit 800 is inserted into a guide adjacent to the printed wiring board 900A, and the connector is plugged into the corresponding connector of the backboard B.

By inserting the respective printed wiring boards of the transmission system into the corresponding guides as described above, the electrical connection between the respective parts of the transmission system is made through the pattern of the backboard B, and the respective parts are connected. Optical connection is made via an optical fiber wired on the back side of the backboard B.

Further, the electrical connection between the respective parts of the receiving system is made via the pattern of the backboard B, and the optical connection between the respective parts is made via the optical fiber wired on the back surface side of the backboard B.

Since it is not necessary to make electrical wiring and optical wiring as described above, the assembling work of the optical transmission terminal station device is simple. In FIG. 2, a printed wiring board 20A is provided with an electric circuit required for a receiving function to mount electronic components. Further, the connector 221 and the optical connector 222 which are plugged into the connector of the backboard B and the optical connector are connected to the printed wiring board 20.
It is mounted on the side edge of A's backboard B.

Four pillars 210 are erected on the printed wiring board 20A, and a board 201 made of a metal plate is mounted on the pillars 210 so as to be openable and closable. One pair of columns 21 to be described in detail
The hinge mechanism 211 provided on the head of 0 makes the board 201 slidable, and the other side edge of the board 201 is fixed by screwing a screw into the screw hole provided on the head end surface of the other pair of stanchions 210. are doing.

A printed wiring board 202 is mounted in parallel on the front surface side of the substrate 201, and the PD assembly 26A, an optical attenuator, a power supply circuit and an alarm system circuit are mounted on the printed wiring board 202.

On the other hand, as shown in FIG. 2B, the optical coupler 21, the PD (photodiode) 22, the splice container 205, etc. are mounted on the back surface side of the substrate 201, and their components are covered 203. Covered with. It should be noted that holes are provided in the cover 203 so that heat of the components can easily be dissipated.

The electric circuit of the printed wiring board 202 and the printed wiring board 20A are connected by the flat cable 226, and the optical components on the back surface of the substrate 201 and the optical connector 22 mounted on the printed wiring board 20A are connected.
2 is connected to the optical fiber 225.

Since the receiving section 20 has a two-stage structure including the printed wiring board 20A on which the electric circuit system is mounted and the substrate 201 on which the optical circuit system is mounted as described above, an assembly and completion test of each circuit system is performed. Is easy.

Further, the heat of the high heat generating electronic components mounted on the printed wiring board 20A is not transmitted to the thermally weak optical components. Furthermore, the cornered electronic components are not mounted on the substrate 201 and the printed wiring board 201 which require a large number of optical fiber wirings. Therefore, even if the uncoated optical fiber (diameter: 0.9 mm) is used, the optical fiber is not damaged, and the wiring of the optical fiber is easy.

In FIG. 3, an electric circuit required for the transmission function is provided on the printed wiring board 50A to mount electronic parts. Further, a connector 521 and an optical connector 522 which are plugged into the connector of the backboard B and the optical connector are mounted on the side edge of the printed wiring board 50A corresponding to the backboard B.

Four columns 510 are erected on the printed wiring board 50A, and a substrate 501 made of a metal plate is placed on the columns 510 in an openable and stackable manner. One pair of columns 51 to be described in detail
The hinge mechanism 511 provided on the head of 0 makes the board 501 slidable, and the other side edge of the board 501 is fixed by screwing a screw into the screw hole provided on the head end surface of the other pair of columns 510. are doing.

A printed wiring board 502 is mounted in parallel on the front surface side of the substrate 501, and a modulator 52, a power supply circuit and an alarm system circuit are mounted on this printed wiring board 502. On the other hand, on the back surface side of the substrate 501, as shown in FIG.
Assembly 51A, Optical coupler 53, PD (photodiode)
54 and a splice container 505 are mounted, and those parts are covered with a cover 503. It should be noted that holes are provided in the cover 503 so that heat of the components can be easily dissipated.

The electric circuit of the printed wiring board 502 and the printed wiring board 50A are connected by the flat cable 526, and the optical components on the back surface of the substrate 501 and the optical connector 52 mounted on the printed wiring board 50A.
2 is connected to the optical fiber 525.

Since the transmitter 50 is constructed as described above, it has the same effect as the effect described in the receiver. FIG.
In, a printed wiring board 10A is provided with an electric circuit required for an optical amplification function to mount electronic components. Further, the connector 121 and the optical connector 122 which are plugged into the connector of the backboard B and the optical connector are mounted on the side edge of the printed wiring board 10A corresponding to the backboard B.

A cover made of a metal plate on the printed wiring board 10A
The shallow box-shaped case 100 with 103 is mounted, and the P / LD (pumping laser diode) assembly 16A and the front stage module 15-1 and the rear stage module 15-3 of the optical amplifier circuit 15 are mounted on the bottom plate 101 of the case. ing.

On the other hand, an upper substrate 102 made of a metal plate is attached and accommodated in the case 100 in parallel with the case bottom plate 101 via a support column. Then, the splice container 10 is mounted on the upper substrate 102.
It is equipped with 5. Further, on the upper substrate 102, several cable holders of a bifurcated structure having a bent piece for preventing the upper opening from coming off are arranged on a circumference having a diameter of 60 mm or more, and the cable holder is provided with an optical cable. The rare earth-doped optical fiber having a length of several meters to several hundred meters of the amplifier circuit 15 is inserted in a substantially circular shape.

As described above, the long rare earth-doped optical fiber is accommodated in the case in a state of being wound in a plane with a large radius, and therefore the receiving side optical amplifying section 10 is thin. Therefore, miniaturization of the shelf 700 accommodating the optical transmission terminal equipment is promoted.

The bottom plate 10 of the case 101 made of a metal plate is also used.
In FIG. 1, the P.LD (pumping laser diode) assembly 16A having high heat generation is accommodated, so that the heat is efficiently transmitted to the case side wall and the cover 103 through the bottom plate 101, and is radiated to the outside of the case.

Furthermore, since the rare earth-doped optical fiber 15-2 is housed on the upper substrate 102 that is substantially thermally shielded above the P.LD (pumping laser diode) assembly 16A, the rare earth is rare earth element. The temperature rise of the doped optical fiber 15-2 is suppressed.

Although not shown, the transmission side optical amplifier 60 has the same structure as the reception side optical amplification section 10.

[0067]

Since the present invention is constructed as described above, it has the following effects. The receiving side optical amplification section, receiving section, E / O conversion section and the transmission system O / E conversion section, transmission section, and transmission side optical amplifier are mounted on the printed wiring boards, and each printed wiring board is mounted. By accommodating and mounting them in parallel in the shelf so that they can be inserted and removed freely, electrical connection between each part of the receiving system and transmitting system is made via the pattern of the backboard,
Since the optical connection between each part is made via the optical fiber wired on the back side of the backboard, there is no need to make electrical wiring and optical wiring between each part at the time of assembly, and the assembly work of the optical transmission terminal device can be performed. It will be easy.

When the printed wiring board is removed from the shelf, the maintenance and inspection work can be carried out for each individual part. Since the receiving part and the transmitting part have a two-stage structure of a printed wiring board and a board, the electric circuit system is mounted on the printed wiring board, and the optical circuit system is mounted on the board, each circuit system is assembled and completed. Easy to test.

Further, the heat of the high heat generating electronic component mounted on the printed wiring board is not transmitted to the thermally weak optical component.
On a board that requires a large number of optical fiber wiring, electronic components with corners are not mounted.
The optical fiber will not be damaged even if (diameter 0.9 mm) is used. Further, since it is an uncoated optical fiber having a small outer diameter, wiring of the optical fiber is easy.

The receiving-side and transmitting-side optical amplifiers have a metal case mounted on a printed wiring board on which an electric circuit system is mounted, and a pump laser diode on the bottom plate of the case and a front stage of the optical amplifier circuit.
A state in which a long rare-earth-doped optical fiber is planarly wound with a large radius by mounting a post-module and mounting a splice container and a rare-earth-doped optical fiber on an upper substrate provided in a two-stage structure in a case. Can be accommodated in the case, and the receiving side optical amplifying section and the transmitting side optical amplifier are thin. Along with this, miniaturization of the shelf for accommodating the optical transmission terminal equipment is promoted.

Further, since the heat of the pumping laser diode is efficiently transferred to the case side wall and the cover through the case bottom plate, the cooling property of the P.LD (pumping laser diode) is improved.

With this, the temperature rise of the rare earth-doped optical fiber is suppressed.

[Brief description of drawings]

FIG. 1 is a perspective view of an embodiment of the present invention.

2A and 2B are diagrams of a receiving unit of the present invention, in which FIG. 2A is a side view and FIG.

3A and 3B are diagrams of a transmitter of the present invention, in which FIG. 3A is a side view and FIG. 3B is a plan view of a back surface of a substrate.

FIG. 4 is a diagram of an optical amplifying portion of the present invention, (A) is a partially cutaway side view, and (B) is a partially broken plan view.

FIG. 5 is a block diagram of an optical transmission terminal device.

FIG. 6 is a front view of an optical transmission terminal device rack.

FIG. 7 is a circuit diagram of an optical transmission terminal device.

[Explanation of symbols]

 1 optical submarine cable 2 cable terminating device 3 optical transmission terminal device 4 connection terminal device 5 land side terminal device 6 land optical cable 7 system unit 8 common part 9 power board 10 receiving side optical amplifying part 20 receiving part 30 E / O converter 40 O / E converter 50 Transmitter 60 Transmitter side optical amplifier 10A, 20A, 30A, 40A, 50A, 60A, 800A, 900A Printed wiring board 11,21,53,61 Optical coupler 12,22,26, 41,54,62 PD (photodiode) 15,65 Optical amplifier circuit 15-1,65-1 Front stage module 15-2,65-2 Rare earth doped optical fiber 15-3,65-3 Rear stage module 16,66 P・ LD (pumping laser diode) 16A P ・ LD (pumping laser diode) assembly 51A LD assembly 25 Optical attenuator 31,51 LD (laser diode) 52 Modulator 100 Case 101 Case bottom plate 102 Upper substrate 103,203,503 Cover 105,205,505 Splice housing Device 121,221,521 Connector 122,222,522 Optical connector 201,501 Board 202,502 Printed wiring board 210,510 Posts 211,511 Hinge mechanism 700 Shelf 800 Interface circuit 900 Power circuit

Claims (6)

[Claims] 1. A landing station comprising a receiving system including a receiving side optical amplification section, a receiving section and an E / O conversion section, and a transmitting system including an O / E conversion section, a transmission section and a transmitting side optical amplifier. In the optical transmission terminal device, the printed wiring board having the receiving side optical amplification section, the printed wiring board having the receiving section, the printed wiring board having the E / O converting section, and the O / E converting section It has a printed wiring board equipped with a printed wiring board, a printed wiring board equipped with the transmitter, and a printed wiring board equipped with the optical amplifier on the transmission side, and a backboard on which connectors and optical connectors are arranged on the back bottom surface, and the front surface is open. A box-shaped shelf, and a connector and an optical connector mounted on each of the printed wiring boards so as to be plugged into the connector of the backboard and the optical connector. Each of the printed wiring boards is attached to the shelf. It can be inserted and removed in parallel and accommodated in parallel. An optical transmission terminal device. 2. The receiving unit includes the printed wiring board on which an electric circuit system is mounted, and a substrate which is mounted on the printed wiring board on which an optical circuit system is mounted via a support. An optical transmission terminal device. 3. A PD assembly, a power supply circuit and an alarm system circuit are mounted on one surface of one side of the substrate, and another optical component and a splice container are mounted on the other surface of the other side. Item 2. The optical transmission terminal device according to item 2. 4. The transmission unit comprises the printed wiring board on which an electric circuit system is mounted, and a substrate which is mounted on the printed wiring board on which an optical circuit system is mounted via a support column. An optical transmission terminal device. 5. A modulator, a power supply circuit and an alarm system circuit are mounted on one side of one side of the board according to claim 4, and another optical component and a splice container are mounted on the other side of the one side. The optical transmission terminal station device according to claim 4. 6. The receiving side optical amplifying section and the transmitting side optical amplifier include the printed wiring board on which an electric circuit system is mounted, a case made of a metal plate mounted on the printed wiring board, and a case inside the case. An upper substrate accommodated via a support is provided, and a P.LD (pumping laser diode) assembly and front and rear modules of an optical amplifier circuit are mounted on the bottom plate of the case, and the upper substrate is An optical transmission terminal device, wherein a rare earth-doped optical fiber of an optical amplifier circuit and a splice container are mounted.