JP2001352302A - Optical amplifying repeater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an optical amplifying repeater the number of monitor control sections of which is not required for number of LD drive circuits even when number of communication systems is increased. SOLUTION: In the signal transmission/reception between a monitor control section 2 and optical amplifiers 12, 13 whose power supply voltages differ from each other, electrooptical conversion means 3a-3f convert an electric signal from either of the optical amplifiers 12, 13 into an optical signal and furthermore convert it into an electric signal and provide an output of the electric signal to the other.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical amplifying repeater for amplifying an optical signal transmitted by an optical transmission line, for example, a plurality of optical amplifiers for amplifying optical signals transmitted by a plurality of optical transmission lines laid underwater. The present invention relates to an optical amplifying repeater that can increase the efficiency of a monitoring control unit that monitors or controls an optical amplifier.

[0002]

2. Description of the Related Art FIG. 5 is a conceptual diagram showing a conventional optical amplification repeater used in an optical communication system having two systems of optical transmission lines capable of bidirectional communication. In the figure, reference numeral 10 denotes a cable for transmitting an optical signal, which has optical fibers 10a and 10b as optical transmission lines and a power supply line 10c as a power supply line.

An optical amplifying repeater 11 amplifies an optical signal transmitted by the optical fibers 10a and 10b. For convenience of explanation, it is assumed that the optical fiber 10a transmits an optical signal from the upper side to the lower side in the figure, and the optical fiber 10b transmits the optical signal from the lower side to the upper side.

[0004] Reference numerals 12 and 13 denote optical amplifiers mounted on the optical amplification repeater 11, which are optical fibers 10a and 1a, respectively.
Ob amplifies the transmitted optical signal.

[0005] Reference numerals 14 and 15 denote monitoring and control units, each of which monitors and monitors the optical amplifiers 12 and 13 in a memory (not shown).
Monitoring and monitoring, which are software programs for controlling
The control program is stored.

Reference numeral 16 denotes a power supply circuit, which is an optical amplifier 1
2. Supply power to the monitoring control unit 14. A power supply circuit 17 supplies power to the optical amplifier 13 and the monitoring control unit 15. Note that the power supply circuits 16 and 17 are connected in cascade to the power supply path 10c, and the power supply circuit 17 is at a subsequent stage. In addition, the power supply circuit 1
6 and 17 form a power supply unit.

Reference numeral 18 denotes a sub-circuit unit, which includes the optical amplifier 12, the monitoring control unit 14, and the power supply circuit 16. 19
Denotes a sub-circuit unit, which includes an optical amplifier 13, a monitoring control unit 15, and a power supply circuit 17.

Next, the operation will be described with reference to the drawings. FIG. 6 shows FIG.
FIG. 3 is a block diagram of an optical amplifier and a monitoring control unit shown in FIG. Since the operations of the sub-circuit units 18 and 19 are almost the same, one operation, here, the operation of the sub-circuit 18 will be mainly described. An optical transmitter (not shown) connected to a terminal of the optical fiber 10a converts a signal obtained by superimposing a main signal composed of transmission information and a sub-signal composed of a command to a specific optical amplification repeater into an optical signal and converts the signal into an optical signal. 10a. The optical signal is transmitted through the optical fiber 10a and input to the optical amplification repeater 11.

Next, the optical coupler 20 of the optical amplifying repeater 11 transmits most of the input optical signal (90% or more of the entire optical signal) to the erbium-doped optical fiber 21 (hereinafter referred to as an optical fiber). Then, a part (several% of the entire optical signal) is branched to the optical / electrical converter 22 side.

First, the operation of the optical amplifying repeater 11 for an optical signal traveling to the optical fiber 21 will be described. Optical coupler 2
Numeral 3 multiplexes the pump light for amplification with the optical signal.

The pumping light is generated by a pumping light generator 24 composed of a laser diode or the like, and a laser diode driving circuit 25 (hereinafter referred to as an LD driving circuit) for driving the pumping light generator 24. is there. Reference numeral 26 denotes a photodetector, which monitors the optical output power of the pump light generator 24.

Next, the optical fiber 21 amplifies and outputs an optical signal obtained by multiplexing the pump light. Next, the isolator 27 allows the optical signal from the optical fiber 21 to pass only to the output side.

Next, the optical coupler 28 converts most (90% or more of the entire optical signal) of the optical signal from the isolator 27 to the optical fiber 10a side and converts a part (several% of the entire optical signal) to optical / electrical conversion. It branches to the vessel 29 side. The optical / electrical converter 29
The light branched to the side is converted into an electric signal by the optical / electrical converter 29, and is transmitted through the sub-signal extractor 30 to the monitor controller 14.
And is mainly used for feedback control.

The optical signal branched to the optical fiber 10a is a signal amplified by a predetermined amount by the optical amplifying repeater 11, and is directed to the next optical amplifying repeater (not shown) or an optical receiver (not shown). Sent out.

The operation of the optical amplifying repeater 11 for an optical signal branched to the optical / electrical converter 22 will be described. light/
The electrical converter 22 converts the optical signal into an electrical signal and outputs the electrical signal.
A sub-signal extraction unit 30 including a filter and a demodulation circuit extracts a sub-signal portion from the electric signal.

Next, the arithmetic processing section 14a of the monitoring control section 14
Decodes an operation command included in the sub-signal based on the monitoring / control program, and performs overall monitoring including the optical amplifier 12 or controls the optical amplifier 12 based on the command.

The monitoring control section 14 (15) monitors, for example, the light output intensity of the pump light generation section 24, the drive current supplied to the pump light generation section 24 by the LD drive circuit 25, and the light amplification repeater 11. There are measurements such as the intensity of the input optical signal and the intensity of the optical signal output from the optical amplification repeater 11, and the output of the measurement result. The control of the monitoring control unit 14 (15) includes, for example, drive current control of the LD drive circuit 25, modulation degree control when outputting monitoring information, and the like.

Next, for example, when the command from the optical transmitter (not shown) is interpreted as the output of the monitoring information, the monitoring controller 14 modulates the monitoring information at a predetermined modulation factor and decodes the monitoring information.
5 is output.

Next, the LD driving circuit 25
The pumping light generator 24 is driven based on the modulated signal from the controller to generate pumping light. This pump light is multiplexed with the optical signal by the optical coupler 23 as described above.

Next, the optical signal in which the pump light including the monitoring information is multiplexed is received by an optical receiver (not shown), divided into a main signal and a pump light component including the monitoring information, and each is demodulated. Is converted into transmission information and monitoring information.

[0021]

Since the conventional optical amplifying repeater is configured as described above, the LD drive circuit that receives power supply from the power supply unit and the monitoring control unit receive power of the same potential. Since they are incorporated in the same sub-circuit, for example, when the number of communication systems is further increased, there is a problem that a monitor control unit is required by the increased number and the cost increases.

The present invention has been made to solve the above problems, and has as its object to provide an optical amplifying repeater which does not require an increase in the number of monitoring and control units even when the number of communication systems is increased.

[0023]

An optical amplifying repeater according to the present invention comprises a plurality of optical amplifiers for amplifying a plurality of optical signals respectively transmitted by a plurality of optical transmission lines, and a monitor for monitoring or controlling the plurality of optical amplifiers. A control unit, a signal connection unit for transmitting and receiving signals between the plurality of optical amplifiers and the monitoring control unit, and supplying power to the plurality of optical amplifiers and the monitoring control unit by connecting to an external power supply path A power supply unit, wherein the power supply unit supplies power of a different potential to each of the plurality of optical amplifiers and supplies a power of a first potential to the monitoring control unit, and the signal connection unit includes a power supply unit of the plurality of optical amplifiers. An optical amplifier to which a potential different from the first potential is supplied and the monitoring control unit are connected via an electric / optical conversion means, and when transmitting / receiving a signal, an electric signal from one is converted into an optical signal and further converted into an electric signal. Output to the other It is intended.

In the optical amplifying repeater of the present invention, the plurality of optical amplifiers and the monitoring control unit are respectively incorporated in separate sub-circuits, and the power supply unit has a predetermined number of power supply circuits connected in series. A plurality of optical amplifiers and the monitoring control unit are respectively supplied with electric powers having different potentials.

In the optical amplifying repeater according to the present invention, the power supply section has a predetermined number of power supply circuits connected in series to supply a plurality of optical amplifiers with powers having different potentials, respectively, and The power of the first potential is supplied only to a predetermined optical amplifier.

In the optical amplifying repeater according to the present invention, a portion of the signal connection portion electrically connected to the monitoring control portion is supplied with power of the first potential, and a portion of the signal connection portion electrically connected to each of the plurality of optical amplifiers is the same as above. Power is supplied from a power supply circuit that supplies power to each of the plurality of optical amplifiers.

[0027] In the optical amplifying repeater of the present invention, the electric / optical conversion means of the signal connection section is a photocoupler.

[0028]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 An embodiment of the optical amplification repeater according to the present invention will be described. FIG. 1 is an explanatory diagram showing an optical amplification repeater according to the first embodiment. FIG. 2 is a block diagram of the optical amplifier and the supervisory control unit shown in FIG. 1. FIG. 2A is a block diagram of the optical amplifier 12 and the supervisory control unit 2, and FIG. FIG. 2 is a block diagram illustrating the control unit 2. FIG. 3 is a block diagram of the signal connection unit shown in FIG. In the figures, the same reference numerals as those in FIG. 5 or FIG. 6 indicate the same or corresponding parts, and the description will be omitted. In the figure, reference numeral 1 denotes an optical amplifying repeater, which receives DC power from a power supply line 10c and amplifies optical signals transmitted by the optical fibers 10a and 10b. Reference numeral 2 denotes a monitoring control unit, which stores a monitoring / control program, which is a software program for monitoring and controlling the optical amplifiers 12 and 13, in a memory (not shown). The monitoring control unit 2 has the same monitoring and control functions as the monitoring control units 14 and 15 shown in FIG.

Reference numeral 3 denotes a signal connection unit, which has a photocoupler as an optical / electrical conversion means for transmitting and receiving signals between the monitoring control unit 2 and the optical amplifier 13.
2 has a signal line (not shown) for transmitting and receiving signals. 1
Reference numeral 8a denotes a sub-circuit unit, which includes a monitoring control unit 2, a signal connection unit 3,
, An optical amplifier 12 and a power supply circuit 16. 19a
Denotes a sub-circuit unit, a part of the signal connection unit 3, the optical amplifier 1
3 and a power supply circuit 17. The sub-circuit 18a is supplied with the first potential power from the power supply circuit 16 and
9a is supplied with power of a potential lower than the first potential from the power supply circuit 17.

The optical amplifying repeater 1 has a configuration denoted by reference numerals 2 and 3, and reference numerals 12, 13, 16, 17, 18a and 1
9a is included.

In FIG. 2, 2a is an arithmetic processing unit,
A monitoring operation or a control operation is performed by a predetermined software program for monitoring or controlling the optical amplifiers 12 and 13 stored in a memory (not shown).

In FIG. 3, reference numeral 3a denotes a light emitting diode, which emits light based on an electric signal from the optical amplifier 13 (shown in FIG. 1). A photodiode 3b detects light from the light emitting diode 3a and outputs an electric signal. Three
An amplifier c amplifies the electric signal from the photodiode 3b and outputs the amplified signal to the monitoring controller 2 (shown in FIG. 1).
A photocoupler is formed by the light emitting diode 3a and the photodiode 3b.

Reference numeral 3d denotes a light emitting diode, which emits light based on an electric signal from the monitoring control unit 2 (shown in FIG. 1). 3e is a photodiode, and a light emitting diode 3e.
d) and outputs an electrical detection signal. Three
f denotes an amplifier, which amplifies the electric signal from the photodiode 3e and outputs it to the optical amplifier 13 (shown in FIG. 1).
Note that a photocoupler is formed by the light emitting diode 3d and the photodiode 3e.

The light emitting diode 3a, the photodiode 3e, and the amplifier 3f are supplied with power from the power supply circuit 17, and the photodiode 3b, the light emitting diode 3d, and the amplifier 3c are supplied with power from the power supply circuit 16.

Next, the operation will be described with reference to the drawings. For example, an optical transmitter (not shown) connected to a terminal of the optical fiber 10a (10b) transmits a signal obtained by superimposing a main signal composed of transmission information and a sub-signal composed of a command to the specific optical amplification repeater 1 or the like. The signal is converted into a signal and transmitted to the optical fiber 10a (10b). The optical signal is transmitted by the optical fiber 10a (10b) and input to the optical amplification repeater 1 (shown in FIG. 1).

Next, the optical amplifier 12 (1
3) WDM coupler 20 (shown in FIG. 2) converts most (90% or more of the entire optical signal) of the input optical signal to optical fiber 2.
1 (shown in FIG. 2), a part (several% of the entire optical signal) is branched to the optical / electrical converter 22 (shown in FIG. 2). In addition,
An optical amplifier 1 for an optical signal traveling to the optical fiber 21 side
The operation of No. 2 is the same as that shown in FIG. The optical / electrical converter 22 converts an optical signal into an electric signal and outputs the electric signal to the monitoring control unit 2 side.

Next, the monitoring control unit 2 extracts the sub-signal portion from the electric signal in the same manner as the monitoring control units 14 and 15 shown in FIG. 5 and, based on the monitoring / control program, sends the operation command included in the sub-signal. Decrypts the optical amplifier 12 based on the command.
Or overall monitoring including the optical amplifier 13 and the optical amplifier 1
2 and the optical amplifier 13 are controlled.

The monitoring by the monitoring controller 2 is similar to the monitoring controllers 14 and 15 shown in FIG. 5 in that the light output intensity of the pumping light generator 24 and the drive supplied by the LD drive circuit 25 to the pumping light generator 24 are controlled. There are measurements of the current, the intensity of the optical signal input to the optical amplification repeater 1, the intensity of the optical signal output from the optical amplification repeater 1, and the like, and the output of the measurement result. Similarly, the control of the monitoring control unit 2 includes a drive current control of the LD drive circuit 25,
There are modulation degree control and the like when outputting monitoring information.

Here, signal transmission and reception between the monitoring control unit 2 and the optical amplifier 13 to which power having a lower potential than the monitoring control unit 2 is supplied will be described. The optical / electrical converter 22 of the optical amplifier 13 outputs an electric signal obtained by electrically converting the optical signal including the operation command to the signal connection unit 3.

Next, the light emitting diode 3a of the signal connection unit 3
Emits light based on an electric signal from the optical / electrical converter 22. The photodiode 3b detects the light and outputs an electric signal. The amplifier 3c amplifies the electric signal from the photodiode 3b and outputs it to the monitoring control unit 2.

Next, the monitoring control section 2 receives the electric signal from the signal connection section 3, and extracts a sub-signal portion from the electric signal by a sub-signal extracting section 30 including a filter and a demodulation circuit (not shown).

Next, the arithmetic processing section 2a of the monitoring control section 2 decodes the operation command contained in the sub signal based on the monitoring / control program. When the command is, for example, a change in the reference drive current of the LD drive circuit 25, the arithmetic processing unit 2 a of the monitoring control unit 2 outputs an electric signal for changing the reference drive current to the signal connection unit 3.

Next, the light emitting diode 3d of the signal connection unit 3
Emits light based on an electric signal from the monitoring control unit 2. The photodiode 3e detects the light and outputs an electric signal. The amplifier 3f amplifies the electric signal from the photodiode 3e and outputs it to the optical amplifier 13.

Next, the LD drive circuit 25 of the optical amplifier 13
Changes the reference drive current supplied to the excitation light generation unit 24 based on the electric signal from the signal connection unit 3.

It should be noted that the LD drive circuit 25 is
4 outputs an electric signal indicating the value of the driving current supplied to the signal connection unit 3 to the signal connection unit 3, and the monitoring control unit 2 changes the power supply potential through the signal conversion of the electric signal-optical signal-electric signal by the signal connection unit 3. The state of the LD drive circuit 25 is monitored.

According to the optical amplifying repeater 1 according to the first embodiment, the signal connection unit 3 is connected to the monitoring control unit 2 or the optical amplifier 13
Since the electric signal from one of the two is converted into an optical signal, and further converted into an electric signal and output to the other, signals can be exchanged between the monitoring control unit 2 and the optical amplifier 13 having different power supply potentials, as in the related art. Therefore, it is not necessary to provide a monitoring control unit for each same potential, so that cost can be reduced.

The signal connection unit 3 includes a light emitting diode 3 a and a photodiode 3 electrically connected to the optical amplifier 13.
e, the amplifier 3c is supplied with power from the power supply circuit 17, and is electrically connected to the monitoring control unit 2 by the photodiode 3b;
Since the light emitting diode 3d and the amplifier 3f are supplied with power from the power supply circuit 16, even if the potentials of the power supply circuits 16 and 17 are different, the signal transmission and reception between the monitoring control unit 2 and the optical amplifier 13 can be smoothly performed with a simple configuration. It can be carried out.

Embodiment 2 Another embodiment of the optical amplification repeater according to the present invention will be described. FIG. 4 is an explanatory diagram showing an aspect of the optical amplification repeater according to the second embodiment. In the drawings, the same reference numerals as those in FIGS. 1 to 3 and 5 or 6 denote the same or corresponding parts, and a description thereof will be omitted. In the figure, 1a
Is an optical amplifying repeater, which is supplied with DC power from the power supply line 10c and amplifies optical signals transmitted by the optical fibers 10a and 10b.

Reference numeral 4 denotes a signal connection unit, which has a photocoupler as an optical / electrical conversion unit, and transmits and receives signals between the monitoring control unit 2 and the optical amplifier 12. Although not shown, the signal connection unit 4 is formed in the same manner as the signal connection unit 3, and a portion electrically connected to the monitoring control unit 2 is supplied with power from the power supply circuit 31 and electrically connected to the optical amplifier 12. The connected portion is supplied with power from the power supply circuit 32.

Reference numeral 31 denotes a power supply circuit for supplying power of the first potential to the monitoring control unit 2 and a part of the signal connection units 3 and 4. Reference numeral 32 denotes a power supply circuit, which supplies power having a potential lower than the first potential to a part of the signal connection unit 4 and the optical amplifier 12. Three
Reference numeral 3 denotes a power supply circuit, which includes a part of the signal connection unit 3 and the optical amplifier 1.
3 is supplied with power having a lower potential than the supply potential of the power supply circuit 32. A power supply unit is formed by the power supply circuits 31, 32, and 33.

Reference numeral 34 denotes a sub-circuit unit, which includes the monitoring control unit 2, a part of the signal connection units 3 and 4, and the power supply circuit 31.
Reference numeral 35 denotes a sub-circuit, which includes a part of the signal connection unit 4, the optical amplifier 12, and the power supply circuit 32. Reference numeral 36 denotes a sub-circuit unit, which is a part of the signal connection unit 3, the optical amplifier 13, and the power supply circuit 3.
3 inclusive.

The optical amplifier repeater 1a has reference numerals 4, 31 to
It includes a configuration denoted by reference numeral 36 and a configuration denoted by reference numerals 3, 12, and 13.

This optical amplification repeater 1a is
As shown in FIG. 1, the monitoring control unit 2 having a different power supply potential.
The signal connection unit 3 performs signal conversion of an electric signal, an optical signal, and an electric signal when transmitting and receiving a signal from one side to the other or the other side of the optical amplifier 13, and furthermore, the monitoring control unit 2 and the optical amplifier 12 having different supply potentials. Since the signal connection unit 4 performs the signal conversion of the electric signal-optical signal-electric signal in the signal transfer from one to the other or vice versa, the signal transfer between circuits having different power supply potentials can be performed smoothly. it can.

Further, since the supervisory control unit 2 is incorporated in the sub-circuit 34 dedicated to supervisory control and is separated from the optical amplifiers 12 and 13, the circuit scale of the supervisory control unit 2 can be made relatively large. Therefore, it is possible to increase the number of monitoring control items and the number of mounted optical amplifiers, and to obtain a more reliable monitoring control and an optical amplifier repeater that can connect more optical transmission lines.

Embodiment 3 Another embodiment of the optical amplification repeater of the present invention will be described. Although each of the optical amplification repeaters 1 and 1a (shown in FIGS. 1 and 4) has a case in which two optical amplifiers are provided, it is needless to say that the number of optical amplifiers is not limited to two and may be provided. No. That is,
The signal connection units 3 (shown in FIG. 3) are provided by the number of optical amplifiers having different supply potentials from the monitoring control unit 2 (shown in FIGS. 1 and 4). It is sufficient to perform signal conversion between an electric signal, an optical signal, and an electric signal between the signals.

[0056]

According to the optical amplifying repeater of the present invention, a plurality of optical amplifiers for amplifying a plurality of optical signals respectively transmitted by a plurality of optical transmission lines, and a monitoring control unit for monitoring or controlling the plurality of optical amplifiers A signal connection unit for transmitting and receiving signals between the plurality of optical amplifiers and the monitoring control unit, a power supply unit connected to an external power supply path to supply power to the plurality of optical amplifiers and the monitoring control unit, The unit supplies power of a different potential to each of the plurality of optical amplifiers and supplies a power of the first potential to the monitoring control unit, and the signal connection unit supplies light having a potential different from the first potential to the optical amplifier. The amplifier and the supervisory control unit are connected via an electric / optical conversion means, and at the time of signal transmission / reception, an electric signal from one is converted into an optical signal, further converted into an electric signal and output to the other, so that the supervisory control unit and the power supply potential With different optical amplifiers Receiving can be performed, it can minimize the number of monitoring control unit.

According to the optical amplifying repeater of the present invention, the plurality of optical amplifiers and the supervisory control unit are respectively incorporated in separate sub-circuits, and the power supply unit has a predetermined number of power supply circuits connected in series. Power of different potentials is supplied to each of the plurality of optical amplifiers and the supervisory control unit, so that the circuit scale of the supervisory control unit can be made relatively large separately from the plurality of optical amplifiers and the supervisory control unit. Monitoring or control can be performed.

According to the optical amplification repeater of the present invention, the power supply section has a predetermined number of power supply circuits connected in series to supply a plurality of optical amplifiers with powers having different potentials, respectively, and to control the plurality of optical amplifiers. Since the power of the first potential is supplied only to a predetermined optical amplifier, the number of signal connection units can be set to the number of optical amplifiers having different supply potentials, and cost can be reduced.

According to the optical amplifying repeater of the present invention, the signal connection portion is electrically connected to the monitoring control portion, the portion of the signal connection portion is supplied with the first potential power, and the signal connection portion is electrically connected to each of the plurality of optical amplifiers. Since power is supplied from a power supply circuit that supplies power to each of the plurality of optical amplifiers, signals can be transmitted and received while the power supply potentials are different.

According to the optical amplifying repeater of the present invention, since the electric / optical conversion means of the signal connection section is a photocoupler, signals can be transferred between circuits having different supply potentials with a simple configuration.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing an optical amplifying repeater according to Embodiment 1 of the present invention.

FIG. 2 is a block diagram illustrating an optical amplifier and a monitoring control unit illustrated in FIG. 1;

FIG. 3 is an explanatory block diagram of a signal connection unit shown in FIG. 1;

FIG. 4 is an explanatory diagram showing an optical amplification repeater according to Embodiment 2 of the present invention.

FIG. 5 is an explanatory diagram showing a conventional optical amplification repeater.

FIG. 6 is an explanatory diagram of the optical amplifier of the conventional optical amplification repeater shown in FIG.

[Explanation of symbols]

1, 1a optical amplification repeater, 2 monitoring control unit, 2a
Arithmetic processing unit, 3,4 signal connection unit, 3a, 3d light emitting diode, 3b, 3e photodiode, 3
c, 3f amplifier, 12, 13 optical amplifier, 16,
17 power supply circuit, 18a, 19a sub circuit, 20
Optical coupler, 21 Erbium-doped amplification optical fiber, 22 Optical / electrical converter, 23 Optical coupler, 2
4 excitation light emitting section, 25 laser diode driving circuit, 26 photodetector, 27 isolator,
28 optical coupler, 29 optical / electrical converter, 30
Sub-signal extraction unit, 31-33 feeding circuit, 34-36
Sub circuit.

Continued on the front page (72) Inventor Masayoshi Nakaoka 2-3-2 Marunouchi, Chiyoda-ku, Tokyo Mitsubishi Electric Corporation F-term (reference) 5K002 AA06 CA13 EA04 EA06 FA01 GA10 5K042 AA08 CA10 DA16 5K046 AA08 CC15 KK07

Claims (5)

[Claims] 1. A plurality of optical amplifiers for amplifying a plurality of optical signals respectively transmitted by a plurality of optical transmission lines, a monitoring control unit for monitoring or controlling the plurality of optical amplifiers, the plurality of optical amplifiers and the monitoring control unit A signal connection unit for transmitting and receiving a signal between the optical amplifier and a power supply unit connected to an external power supply path to supply power to the plurality of optical amplifiers and the monitoring control unit; An optical amplifier for supplying power of a different potential to each of the amplifiers and supplying a power of a first potential to the monitoring control unit, wherein the signal connection unit is supplied with a potential different from the first potential among the plurality of optical amplifiers; And an monitor / control unit connected via an electric / optical conversion means to convert an electric signal from one to an optical signal when transmitting / receiving a signal, further convert the electric signal to an electric signal, and output the electric signal to the other. Repeater. 2. A plurality of optical amplifiers and a monitoring control unit are respectively incorporated in separate sub-circuits, and a power supply unit has a predetermined number of power supply circuits connected in series, and the plurality of optical amplifiers and the monitoring control unit are provided. 2. The optical amplifying repeater according to claim 1, wherein electric powers having different potentials are supplied to the control unit. 3. The power supply section has a predetermined number of power supply circuits connected in series to supply a plurality of optical amplifiers with powers having different potentials, respectively, and supplies the power to only a predetermined one of the plurality of optical amplifiers. The optical amplifying repeater according to claim 1, wherein power of one potential is supplied. 4. A signal connection unit, wherein a portion electrically connected to the monitoring control unit is supplied with power of a first potential, and a portion electrically connected to each of the plurality of optical amplifiers supplies power to each of the plurality of optical amplifiers. The optical amplifying repeater according to claim 2, wherein power is supplied from a power supply circuit that supplies power. 5. The optical amplifying repeater according to claim 1, wherein the electric / optical conversion means of the signal connection unit is a photocoupler.