KR20060100127A - Wdm transmission system using shared seed light source - Google Patents

Abstract

The present invention relates to a WDM transmission system that allows multiple optical signal transmitters to share a seed light source.

In the WDM transmission system using the shared seed light source of the present invention, a seed light generator for wavelength-division multiplexing and outputting a plurality of seed lights having different wavelengths and output at a constant intensity, and demultiplexing the wavelength-division multiplexed seed light At least one optical signal transmitter which amplifies and modulates the signal according to a signal, and outputs the modulated optical signals by wavelength division multiplexing, and demultiplexes the wavelength division multiplexed optical signals in the optical signal transmitter and converts the demultiplexed modulated optical signals into electrical signals At least one optical signal receiver and a seed splitting power generated by the seed light generator for power splitting and transmitting the plurality of optical signal transmitters to the plurality of optical signal transmitters, and the optical signal receiver With optical signal transmission means for transmitting to a plurality of optical signal transmission apparatus is not modulated To accurately maintain the wavelength of the optical signal by allowing to share the seed light source of constant intensity, and makes it possible to reduce the maintenance cost by reducing the resources required for system operation.

Description

WDM transmission system using shared seed light source}

Figure 1a is a block diagram showing the configuration of a WDM transmission system using direct modulation.

Figure 1b is a block diagram showing the configuration of a WDM transmission system using indirect modulation.

2 is a block diagram showing a configuration of a WDM transmission system using a shared seed light source according to the first embodiment of the present invention.

3 is a block diagram showing a configuration of a WDM transmission system using a shared seed light source according to a second embodiment of the present invention.

4 is a block diagram showing a configuration of a WDM transmission system using a shared seed light source according to a third embodiment of the present invention.

5A is a block diagram showing a configuration of a WDM transmission system using a shared seed light source according to a fourth embodiment of the present invention.

5B is a block diagram showing a configuration of a WDM transmission system using a shared seed light source according to a fifth embodiment of the present invention.

6A to 6D are diagrams each showing a configuration of a WDM transmission system using a shared seed light source according to the sixth to ninth embodiments of the present invention.

7A to 7D are diagrams illustrating the configuration of a WDM transmission system using a shared seed light source according to embodiments 10 to 13 of the present invention.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wavelength division multiplexing (WDM) system. More particularly, a plurality of different optical signal transmitters, each having no light source, are provided with an unmodulated constant strength seed provided from a telephone station. seed) The present invention relates to a wavelength division multiplexing system that can maintain the wavelength of signal light accurately by sharing a light source and reduce the system maintenance cost.

WDM-PON connects the optical line terminal (OLT) and optical network unit (ONU) of a telephone service provider, which is a telecommunications service provider, with a passive optical device and carries multiplexed data on an optical signal. The WDM-PON is a network that distributes and transmits to ONU. This WDM-PON not only provides a large amount of information to subscribers, but also provides excellent security and easy performance.

FIG. 1 is a configuration diagram briefly showing a configuration of a conventional WDM transmission system. FIG. 1A shows a configuration of a WDM transmission system using direct modulation, and FIG. 1B shows a configuration of a WDM transmission system using indirect modulation.

)를 파장분할역다중화기(WDM)(3)로 역다중화하여 각 파장별로 분리시킨 후 각 파장에 대응되는 광검출기(Photo-detector)(4)에서 역다중화된 광신호를 전기신호로 변환함으로써 광신호 송신장치에서 전송한 데이터를 검출해낸다.In FIG. 1A, a plurality of laser diodes (LDs) 1 for generating light having different specific wavelengths λ ₁ to λ _n are provided on a transmitting device side, and an electrical signal is provided to each LD 1. Directly modulates the electrical signal into an optical signal in the LD (1). The modulated optical signals of different wavelengths λ ₁ to λ _n are multiplexed in a wavelength division multiplexer (WDM) 2 and then transmitted to the optical signal receiver through an optical path. On the optical signal receiver side, the multiplexed optical signal (

) Is demultiplexed by a wavelength division multiplexer (WDM) (3) to separate each wavelength, and the optical signal is converted into an electrical signal by converting the demultiplexed optical signal into an electrical signal in a photo-detector (4) corresponding to each wavelength. Detect the data transmitted from the signal transmitter.

In FIG. 1B, modulators 5 for optical signal modulation are provided on the optical signal transmitting device side separately from LDs (Laser Diodes) 1, so that the optical signals applied from the LD 1 in each modulator 5 are electrically transferred. Modulate according to the signal and output it. The modulated optical signals of different wavelengths λ ₁ to λ _n are multiplexed in a wavelength division multiplexer (WDM) 2 and then transmitted to the receiving apparatus through an optical path.

The most important and costly part of such a WDM transmission system is to accurately maintain the wavelength of the signal light. However, in the above-described conventional WDM transmission system, each transmission device includes a light source LD to generate optical signals for data transmission, and use them as signal light, so that overall management of the signal light is difficult, so that the wavelength of the signal light is accurately corrected. It is difficult to maintain. In addition, each subscriber is assigned a light of a different wavelength, in this case, the more the number of subscribers, the more resources are required to operate the system has a high cost.

Accordingly, an object of the present invention for solving the above problems is to improve the structure of the WDM transmission system to more easily maintain the wavelength of the signal light while reducing the cost for operating the system.

The WDM transmission system using the shared seed light source of the present invention for achieving the above object, a seed light generator for wavelength-division multiplexing and outputting a plurality of seed light having a different wavelength and output with a constant intensity, wavelength division multiplexed At least one optical signal transmitter for amplifying and modulating seed light by amplifying and modulating the optical signals according to an electrical signal, and outputting the wavelength-division multiplexed modulated optical signals, and demultiplexing and demultiplexing the wavelength-division multiplexed optical signal at an optical signal transmitter At least one optical signal receiver for converting optical signals into electrical signals, and seed splitting at the seed light generator for power splitting to transmit to the plurality of optical signal transmitters, and at least one optical signal transmitter for wavelength division multiplexing Optical signal transmission means for transmitting the received optical signal to the optical signal receiving unit.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the present invention.

2 is a system configuration diagram illustrating a configuration of a WDM transmission system using a shared seed light source according to a first embodiment of the present invention. This embodiment describes the case where the seed light generator 10 and the optical signal transmitter 20 are installed in the same place.

The WDM transmission system of FIG. 2 includes a seed light generator 10, an optical signal transmitter 20, an optical signal receiver 30, an optical splitter 40, and an optical circulator 50.

)하여 출력하는 WDM부(14)를 구비한다. 이때, 레이저 다이오드들은 단일 모드 레이저 광을 생성하는 분포궤환 레이저 다이오드(DFB-LD:Distributed Feedback Laser Diode)가 사용된다.The seed light generator 10 generates seed light λ _{i, u, s} of various wavelengths to be shared and used by the plurality of optical signal transmitters 20, and generates seed light λ _{i, s} of various wavelengths. ) Wavelength division multiplexing and output. The seed light generator 10 wavelength-divisions the plurality of laser diodes LD 12 and seed light λ _{i, s} that generate seed light λ _{i, s} of various wavelengths having a predetermined intensity. Multiplexed (WDM) (

And a WDM unit 14 for outputting. At this time, the laser diodes are distributed feedback laser diodes (DFB-LD) for generating single mode laser light.

)을 WDM부(22)에서 역다중화하고 역다중화된 각 시드광(λ_i,s)을 반사형 반도체 광증폭기(24)에서 전기신호에 따라 증폭 및 변조시켜 다시 출력한다. 반사형 반도체 광증폭기(24)에서 증폭 및 변조된 광신호(λ_i,m)들은 WDM부(22)에서 다시 파장분할 다중화되어 출력된다.When the optical signal transmitter 20 receives the wavelength-divided multiplexed seed light λ _{i, s} from the seed light generator 10, the optical signal transmitter 20 demultiplexes the seed light λ _{i, s} for each wavelength. Amplified and modulated according to the electrical signal, the optical signals λ _{i and m} including data are generated. In addition, the optical signal transmitter 20 multiplexes and outputs the amplified and modulated optical signals λ _{i, m} . That is, the optical signal transmitter 20 does not have an LD itself, receives the seed light from the seed light generator 10, amplifies and modulates the seed light according to an electric signal, and uses the optical signal for data transmission. To this end, the optical signal transmitter 20 includes a WDM unit 22 and a reflective-semiconductor optical amplifier (R-SOA) 24, and the wavelength provided from the seed light generator 10. Split multiplexed seed light (

) Is demultiplexed by the WDM unit 22, and each demultiplexed seed light [lambda] _{i, s} is amplified and modulated by the reflective semiconductor optical amplifier 24 according to an electrical signal and output again. The optical signals λ _{i and m} amplified and modulated by the reflective semiconductor optical amplifier 24 are wavelength-division multiplexed and output again by the WDM unit 22.

)를 역다중화한 후 역다중화된 광신호(λ_i,m)를 전기신호로 변환한다. 이러한, 광신호 수신부(30)는 파장분할 다중화된 광신호(

)를 역다중화하는 WDM부(32) 및 역다중화된 광신호(λ_i,m)를 전기신호로 변환하는 광다이오드(PD:Photo Diode)(34)를 구비한다.The optical signal receiver 30 is an optical signal (eg, wavelength-division multiplexed and output from the optical signal transmitter 20).

) Is demultiplexed and the demultiplexed optical signal λ _{i, m} is converted into an electrical signal. The optical signal receiver 30 is a wavelength division multiplexed optical signal (

) And a photodiode (PD) 34 for converting the demultiplexed optical signals λ _{i, m} into electrical signals.

)을 n개(1×n)의 광경로로 파워 분기시켜 출력한다.The optical splitter 40 is a wavelength division multiplexed seed light output from the seed light generator 10 so that seed light having the same wavelength can be shared and used by different optical signal transmitters (not shown).

) Is outputted by power branching into n (1 x n) optical paths.

,

)의 진행방향을 기 설정된 방향(1→2→3→1)으로 순환시킨다. 즉, 광서큘레이터(50)는 시드광 발 생부(10) 측으로부터 전송되어 오는 파장분할 다중화된 시드광(

)은 광신호 송신부(20) 측으로 진행시키고, 광신호 송신부(20) 측으로부터 전송되어 오는 파장분할 다중화된 광신호(

)는 광신호 수신부(30) 측으로 진행시킨다.The optical circulator 50 is positioned between the seed light generator 10, the optical signal transmitter 20, and the optical signal receiver 30 to perform wavelength division multiplexed optical signals (

,

) Is circulated in the preset direction (1 → 2 → 3 → 1). That is, the optical circulator 50 is a wavelength division multiplexed seed light transmitted from the seed light generator 10 side (

) Proceeds to the optical signal transmitter 20 side, and the wavelength division multiplexed optical signal transmitted from the optical signal transmitter 20 side (

) Proceeds to the optical signal receiver 30.

The operation of the WDM transmission system having the structure as shown in FIG. 2 is briefly described as follows.

)된 후 출력된다. WDM부(14)로부터 출력된 파장분할 다중화된 시드광(

)은 1×n 광분기기(40)에서 파워 분기되어 광신호 송신부(20)를 포함한 서로 다른 복수개의 광신호 송신부들(미도시)로 전송된다. 이처럼, 광분기기를 이용하여 시드광(

)을 분기시켜 복수개의 광신호 송신부들(미도시)로 전송해줌으로써 동일 파장의 시드광을 다수의 광신호 송신부들(미도시)에서 공유하여 사용할 수 있도록 해준다.The seed light λ _{i, s} of the unmodulated wavelengths output from the DFB-LD 12 at a constant intensity is wavelength-division multiplexed in the WDM unit 14.

) Is printed. Wavelength division multiplexed seed light output from the WDM unit 14 (

) Is power branched from the 1 × n optical splitter 40 and transmitted to a plurality of different optical signal transmitters (not shown) including the optical signal transmitter 20. As such, the seed light (

) And transmits it to a plurality of optical signal transmitters (not shown) so that the seed light of the same wavelength can be shared and used by multiple optical signal transmitters (not shown).

)는 광서큘레이터(50)의 1번 포트로 인가된 후, 광서큘레이터(50)에 의해 그 진행방향이 반시계 방향으로 순환되어 2번 포트로 출력되어 광신호 송신부(20)의 WDM부(22)로 인가된다.Any of the branched seed lights (

) Is applied to port 1 of the optical circulator 50, and then the traveling direction is circulated in the counterclockwise direction by the optical circulator 50 and outputted to the port 2 so that the WDM unit of the optical signal transmitter 20 Is applied to (22).

)을 역다중화 시킨 후 역다중화된 여러 파장의 시드광(λ_i,s)들을 각 파장에 대응되는 반사형 반도체 광증폭기(24)로 출력한 다.The WDM unit 22 is applied seed light (

) And then demultiplexed seed light (λ _{i, s} ) of various wavelengths is output to the reflective semiconductor optical amplifier 24 corresponding to each wavelength.

The reflective semiconductor optical amplifier 24 converts and outputs the incident seed light lambda _{i, s} into an optical signal lambda _{i, m} containing data to be transmitted by amplifying and modulating the seed light lambda _{i, s} according to an electric signal. The modulated optical signals λ _{i, m} output from the reflective semiconductor optical amplifier 24 are wavelength-division multiplexed again by the WDM unit 22 and then output to the port 2 of the optical circulator 50.

)는 광서큘레이터(50)에 의해 순환되어 3번 포트로 출력되어 광신호 수신부(30)로 전송된다.The wavelength division multiplexed optical signal in the WDM unit 22 (

) Is circulated by the optical circulator 50 and output to port 3 and transmitted to the optical signal receiver 30.

)를 역다중화한 후 역다중화된 신호(λ_i,m)를 대응되는 광다이오드(34)로 출력하며, 광다이오드(34)는 광신호(λ_i,m)를 복조하여 광신호(λ_i,m)에서 전기신호를 검출한다.The WDM unit 32 of the optical signal receiver 30 is a wavelength division multiplexed optical signal (

) And then demultiplexed signal λ _{i, m} to the corresponding photodiode 34, and the photodiode 34 demodulates the optical signal λ _{i, m} to light signal λ _{i , m} ) to detect electrical signals.

In FIG. 2, only one optical signal transmitter 20 and an optical signal receiver 30 are illustrated for convenience of description, but a plurality of optical signal transmitters (not shown) and optical signal receivers that share seed light are illustrated. The operations described above are performed on the same principle in (not shown).

3 is a block diagram showing a configuration of a WDM transmission system using a shared seed light source according to a second embodiment of the present invention.

In FIG. 2, the seed light generator 10 and the optical signal transmitter 20 are installed at the same place, and the optical signal receiver 30 is installed at a distance from the optical circulator 50 and the optical signal receiver 30. A light path is provided between them. However, in the present embodiment, the seed light generator 10 and the optical signal receiver 30 are installed at the same place, and the optical signal transmitter 20 is installed at a different place from the optical circulator 50 and the optical signal. An optical path is provided between the transmitters 20. In addition, since the overall operation of each component 10 to 50 constituting the system and the system is the same as in FIG. 2, a description thereof will be omitted.

4 is a block diagram showing a configuration of a WDM transmission system using a shared seed light source according to a third embodiment of the present invention. The seed light generator 10, the optical signal transmitter 20, and the optical signal receiver 30 are shown in FIG. ) Are installed in different places, and the overall operation of the system and each of the components 10 to 50 constituting the system are the same as in FIG.

5A is a block diagram illustrating a configuration of a WDM transmission system using a shared seed light source according to a fourth embodiment of the present invention.

)을 증폭하기 위한 광증폭기(60)를 더 구비한다. 즉, 시드광 발생부(10)에서 출력된 시드광(

)이 광분기기(40)에서 파워 분기되면 그 파워가 약해져 장거리 전송이 용이하지 않으므로 광분기기(40)의 출력단에 광증폭기(60)를 구비하여 시드광(

)의 광파워를 다시 증폭시켜 준다.In the WDM transmission system according to the present embodiment, the seed light having a power branch compared to the WDM transmission system of FIG.

It further comprises an optical amplifier 60 for amplifying). That is, the seed light output from the seed light generator 10 (

When the power is branched from the optical splitter 40, the power is weakened, so that long-distance transmission is not easy. Therefore, the optical amplifier 60 is provided at the output terminal of the optical splitter 40 to provide a seed light (

Amplify the optical power of) again.

5B is a block diagram showing the configuration of a WDM transmission system using a shared seed light source according to a fifth embodiment of the present invention.

)을 광분기기(70)를 이용하여 다시 분기시킴으로써, 광분기기(40) 만을 이용하는 경우 보다 더 많은 광신호 송신부들(미도시)이 시드광을 공유할 수 있도록 해줄 수 있게 된다. 이외의 시스템 구성은 도 5a와 동일하다.In the present embodiment, an optical splitter 70 is further provided at the output terminal of the optical amplifier 60 as compared with FIG. 5B. That is, seed light whose power is amplified by the optical amplifier 60 (

By branching again using the optical splitter 70, more optical signal transmitters (not shown) can share the seed light than when using the optical splitter 40 alone. The system configuration other than this is the same as FIG. 5A.

FIG. 6A is a block diagram illustrating a configuration of a WDM transmission system using a shared seed light source according to a sixth embodiment of the present invention.

)을 분기시키는 방법을 나타내고 있는 반면에, 본 실시예는 도 3에서와 같이 시드광 발생부(10)와 광신호 송신부(20)가 서로 다른 장소에 설치되는 경우에 있어서 시드광(

)을 분기시키는 방법을 나타낸다.5A and 5B, the seed light generator 10 and the optical signal transmitter 20 are installed in the same place as in FIG. 2.

In this embodiment, the seed light generator 10 and the optical signal transmitter 20 are installed in different places, as shown in FIG.

) Is shown.

)을 다시 분기시킨다. 그리고, 광서큘레이터(70, 80)를 이용하여 광분기기(70)에서 분기된 시드광(

)과 광신호 송신부(20)에서 변조된 광신호(

)의 진행경로를 제어한다.In the present exemplary embodiment, the seed light branched by the optical splitter 40 further includes an optical splitter 60 between the optical signal transmitter 20 and the optical circulator 50 as compared with FIG. 3.

Branch again). The seed light branched from the optical splitter 70 using the optical circulators 70 and 80 (

) And the optical signal modulated by the optical signal transmitter 20

Control the progress path of

The operation of the WDM transmission system having the configuration of FIG. 6A will be briefly described as follows.

)은 광분기기(40)에서 1차 분기된 후 분기된 시드광 중 어느 하나가 광서큘레이터(50)의 1번 포트로 인가된다. 광서큘레이터(50)는 1번 포트로 인가된 시드광(

)을 2번 포트 즉 광신호 전송부(20) 측으로 출력한다. 광서큘레이터(50)의 2번 포트로 출력된 시드광(

)은 광서큘레이터(70)의 1번 포트로 인가된 후 2번 포트로 출력된다. 광서큘레이터(70)의 2번 포트로 출력된 시드광(

)은 광분기기(60)에서 2차 분기되어 다수의 광신호 송신부들(미도시)로 전송된다. 분기된 시드광들 중 어느 하나는 광서큘레이터(80)의 1번 포트로 인가된 후 2번 포트로 출력되어 광신호 송신부(20)로 제공된다. 광신호 송신부(20)로 인가된 시드광(

)은 WDM부(22)에서 각 파장별로 역다중화되고, 역다중화된 시드광(λ_i,s)은 반사형 반도체 증폭기(24)에서 증폭 및 변조되어 데이터를 갖는 광신호(λ_i,m)로 출력된다.Seed light generated by the seed light generator 10 (

) Is first branched in the optical splitter 40, any one of the branched seed light is applied to the port 1 of the optical circulator 50. The optical circulator 50 is a seed light applied to the first port (

) Is output to port 2, that is, the optical signal transmitter 20. Seed light output from port 2 of the optical circulator 50 (

) Is applied to port 1 of the optical circulator 70 and then output to port 2. Seed light output from port 2 of the optical circulator 70 (

) Is second-branched in the optical splitter 60 and transmitted to a plurality of optical signal transmitters (not shown). One of the branched seed lights is applied to port 1 of the optical circulator 80 and then output to port 2 and provided to the optical signal transmitter 20. Seed light applied to the optical signal transmitter 20 (

) Is demultiplexed for each wavelength in the WDM unit 22, and the demultiplexed seed light λ _{i, s} is amplified and modulated in the reflective semiconductor amplifier 24 to have an optical signal λ _{i, m} having data. Is output.

)된 후 광서큘레이터(80)의 2번 포트로 인가되어 3번 포트로 출력된다. 이 광신호(

)는 광서큘레이터(70)와 광서큘레이터(50)를 통해 광신호 수신부(30)로 인가된다. 광신호 수신부(30)로 인가된 광신호(

)는 WDM부(32)에서 각 파장별로 역다중화되고, 역다중화된 광신호(λ_i,m)는 광다이오드(34)에 의해 전기신호로 변환된다.The optical signal λ _{i, m} amplified and modulated by the reflective semiconductor amplifier 24 is subjected to wavelength division multiplexing by the WDM unit 22.

After being applied to the port 2 of the optical circulator 80 is output to the port 3. This optical signal (

) Is applied to the optical signal receiver 30 through the optical circulator 70 and the optical circulator 50. An optical signal applied to the optical signal receiver 30

) Is demultiplexed for each wavelength in the WDM unit 32, and the demultiplexed optical signals λ _{i, m} are converted into electrical signals by the photodiode 34.

6B is a block diagram showing the configuration of a WDM transmission system using a shared seed light source according to a seventh embodiment of the present invention.

)이 전송되는 도중에 광파워가 약해지는 경우 시드광(

)을 증폭시켜 약해진 광파워를 다시 증가시켜준다.The WDM transmission system according to the present embodiment is different from that provided with the optical amplifier 60 instead of the optical splitter 70 in comparison with FIG. 6A. In the present embodiment, the distance between the seed light generator 10 and the optical signal transmitter 20 is greater than the seed light (

Seed light ()

A) to increase the weakened optical power again.

)을 광증폭기(60)로 증폭시킨 후 다시 광분기기(70)로 분기시킴으로써 보다 많은 광신호 송신부들(미도시)이 시드광을 공유할 수 있도록 해준다.FIG. 6C is a diagram illustrating a configuration of a WDM transmission system using a shared seed light source according to an eighth embodiment of the present invention. FIG. 6A and 6B are combined views. That is, the seed light outputted to port 2 of the optical circulator 80 includes both the optical amplifier 60 and the optical splitter 70.

Amplified by the optical amplifier 60 and then branched back to the optical splitter 70 to allow more optical signal transmitters (not shown) to share the seed light.

)이 광분기기(40, 70)에서 두차례 분기됨에 따라 그 세기가 약해질 수 있으므로 이를 광증폭기(60)를 이용하여 다시 증폭시켜주는 것이다.FIG. 6D is a block diagram showing the configuration of the WDM transmission system using the shared seed light source according to the ninth embodiment of the present invention. In FIG. 6C, the positions of the optical amplifier 60 and the optical splitter 70 are changed. That is, in this embodiment, the seed light (

) May be weakened as it is branched twice in the optical splitter (40, 70) to amplify it again using the optical amplifier (60).

)의 진행경로 상에서 시드광(

)을 먼저 증폭시킨 후 다시 분배하느냐 아니면 먼저 분배한 후 분배된 시드광들을 증폭시키느냐 하는 차이가 있을 뿐이다.That is, the WDM transmission system of FIGS. 6C and 6D uses seed light (

Seed light on the path of

The only difference is whether to amplify the first and then redistribute or amplify the seed seeds.

7A to 7D are diagrams illustrating the configuration of a WDM transmission system using a shared seed light source according to the tenth to thirteenth embodiments of the present invention.

 7A to 7D illustrate the seed light generator 10 when the seed light generator 10, the optical signal transmitter 20, and the optical signal receiver 30 are installed at different positions as shown in FIG. 4. FIG. 6A to 6D show the case where at least one of the optical amplifier 60 and the optical splitter 70 is provided at the output terminal of the FIG.

That is, FIG. 7A illustrates a case in which only the optical amplifier 60 is further provided at the output terminal of the optical splitter 40, and FIG. 7B illustrates a case in which only the optical splitter 70 is further provided at the output terminal of the optical splitter 40. 7C and 7D show a case in which both the optical amplifier 60 and the optical splitter 70 are provided at the output end of the optical splitter 40, and the positions thereof are interchanged as shown in FIGS. 6C and 6D.

As described above, the WDM transmission system using the shared seed light source of the present invention shares a non-modulated constant seed light source, which is provided from a telephone station by a plurality of different optical signal transmitters, each having no light source. It can maintain the wavelength of signal light accurately and reduce the maintenance cost by reducing the necessary resources for system operation.

Claims (12)

A seed light generator for wavelength-division multiplexing and outputting a plurality of seed lights having different wavelengths and output at a constant intensity; At least one optical signal transmitter for demultiplexing the wavelength division multiplexed seed light to amplify and modulate the modulated optical signals, and output the result by wavelength division multiplexing the modulated optical signals; At least one optical signal receiver for demultiplexing a wavelength division multiplexed optical signal in the optical signal transmitter and converting the demultiplexed modulated optical signals into the electrical signal; And The power for splitting the wavelength-divided multiplexed seed light in the seed light generator to be transmitted to the plurality of optical signal transmitters, and the at least one optical signal transmitter to transmit the wavelength-division multiplexed optical signal to the optical signal receiver WDM transmission system using a shared seed light source having a signal transmission means.  The method of claim 1, wherein the seed light generating unit A light generator for generating and outputting the seed lights; And And a first WDM unit for wavelength division multiplexing the seed light beams. The method of claim 2, wherein the light generating unit WDM transmission system using a shared seed light source, characterized in that it comprises distributed feedback laser diodes (DFB-LD) for generating single mode laser light. The optical signal transmitter of claim 1, wherein the optical signal transmitter A second WDM unit which demultiplexes the wavelength division multiplexed seed light and wavelength division multiplexes the modulated optical signals; And And a reflection type semiconductor amplifier which amplifies and modulates the seed light demultiplexed by the second WDM unit according to the electric signal. The optical signal receiver of claim 1, wherein the optical signal receiver A third WDM unit to demultiplex the wavelength division multiplexed optical signal in the optical signal transmitter; And And a photodiode for converting the modulated optical signals demultiplexed by the third WDM unit into the electrical signals. The method of claim 1, wherein the optical signal transmission means A first optical splitter configured to power branch the seed split wavelength multiplexed by the seed light generator; And And a first optical circulator for transmitting the power branched seed light to the optical signal transmitter and transmitting the wavelength division multiplexed optical signal to the optical signal receiver. WDM transmission system using. The method of claim 6, And a first optical amplifier configured to amplify the seed light power-branched by the first optical splitter. The method of claim 7, wherein And a second optical splitter configured to power branch the seed light amplified by the optical amplifier. The method of claim 6, A second optical circulator for transmitting seed light from the first optical circulator to a first optical path and transmitting an optical signal provided through the second optical path to the first optical circulator; A third optical splitter for power branching seed light transmitted through the first optical path; And And a third optical circulator for transmitting seed light from the third optical splitter to the optical signal transmitter and transmitting the optical signal from the optical signal transmitter to the second light beam. WDM transmission system using. The method of claim 9, And a second optical amplifier configured to amplify the seed light power-branched by the third optical splitter. The method of claim 9, And a third optical amplifier for amplifying and transmitting seed light from the second optical circulator on the first optical path to the third optical splitter. The method of claim 6, A fourth optical circulator for transmitting seed light from the first optical circulator to a third optical path and transmitting an optical signal provided through the fourth optical path to the first optical circulator; A fourth optical amplifier for amplifying seed light transmitted through the third optical path; And And a fifth optical circulator for transmitting seed light from the fourth optical amplifier to the optical signal transmitter, and transmitting an optical signal from the optical signal transmitter to the fourth light beam. WDM transmission system using.

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