JP2973886B2 - WDM transmission system - Google Patents
WDM transmission systemInfo
- Publication number
- JP2973886B2 JP2973886B2 JP7223640A JP22364095A JP2973886B2 JP 2973886 B2 JP2973886 B2 JP 2973886B2 JP 7223640 A JP7223640 A JP 7223640A JP 22364095 A JP22364095 A JP 22364095A JP 2973886 B2 JP2973886 B2 JP 2973886B2
- Authority
- JP
- Japan
- Prior art keywords
- signal
- wavelength
- wavelength band
- wavelengths
- terminal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Description
【０００１】[0001]
【発明の属する技術分野】本発明は波長多重伝送方式に
関し、特に分岐装置を有する波長多重伝送方式に関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wavelength division multiplexing transmission system, and more particularly to a wavelength division multiplexing transmission system having a branching device.
【０００２】[0002]
【従来の技術】従来、この種の伝送方式は、分岐枝に障
害が発生した場合に正常な伝送路での通信を確保するこ
とを目的として用いられている。2. Description of the Related Art Conventionally, this type of transmission system has been used for the purpose of securing communication on a normal transmission line when a failure occurs in a branch.
【０００３】図３は３ポートの分岐装置を有する従来の
波長多重伝送方式の一例を示すブロック図である。端局
２３は分岐装置３２のポートＰ１に接続され、端局２４
は分岐装置３２のポートＰ２に接続され、端局２５は分
岐装置３２のポートＰ３に接続されている。また、分岐
装置３２内は３つのポートＰ１〜Ｐ３間を互いに通信可
能なように接続されている。分岐装置３２内のすべての
経路間には、光スイッチ２６〜３１が接続され、各端局
２３〜２５からの信号により切り替えが可能である。FIG. 3 is a block diagram showing an example of a conventional wavelength division multiplexing transmission system having a three-port branching device. The terminal station 23 is connected to the port P1 of the branching device 32,
Is connected to the port P2 of the branching device 32, and the terminal station 25 is connected to the port P3 of the branching device 32. In the branching device 32, the three ports P1 to P3 are connected so as to be able to communicate with each other. Optical switches 26 to 31 are connected between all the paths in the branching device 32, and can be switched by signals from the terminal stations 23 to 25.
【０００４】次に、本従来例の動作を説明する。通常、
端局２３と端局２４間は光スイッチ２６と２７を介し
て、端局２４と端局２５間は光スイッチ２８と２９を介
して、端局２５と端局２３は光スイッチ３０と３１を介
して、同時に通信可能である。ここで、分岐装置３２と
端局２５間に障害が発生した場合、分岐装置３２内の端
局２５と端局２３間の光スイッチ３０、３１、および端
局２４と端局２５間の光スイッチ２８、２９を切り替え
る信号を端局２３、端局２４から送信して切り替えを行
う。光スイッチ２８、２９、３０、３１の切り替え後、
端局２３と端局２４間の伝送路（端局２３→光スイッチ
３１→光スイッチ２９→端局２４）、伝送路（端局２３
←光スイッチ３０←光スイッチ２８←端局２４）が追加
され、分岐装置３２を介さない経路（通常の伝送ネット
ワークでは、非常時のための迂回路が設けてある）を用
いて端局２４と端局２５間、端局２５と端局２３の通信
を確保することが可能となる。Next, the operation of the conventional example will be described. Normal,
The terminal 23 and the terminal 24 are connected via optical switches 26 and 27.
Between the terminal stations 24 and 25 via optical switches 28 and 29.
Then , the terminal stations 25 and 23 are connected via the optical switches 30 and 31.
And can communicate at the same time. Here, when a failure occurs between the branching device 32 and the terminal station 25, the optical switches 30, 31 between the terminal station 25 and the terminal station 23 in the branching device 32 and the optical switch between the terminal station 24 and the terminal station 25 are provided. Signals for switching between 28 and 29 are transmitted from the terminal stations 23 and 24 to perform switching. After switching the optical switches 28, 29, 30, 31
Transmission path between the terminal stations 23 and 24 (terminal station 23 → optical switch)
31 → optical switch 29 → terminal 24), transmission path (terminal 23)
← Optical switch 30 ← Optical switch 28 ← Terminal station 24) is added, and a route (normal transmission network) not passing through the branching device 32 is added.
In the work, it is possible to secure communication between the terminal stations 24 and 25 and between the terminal stations 25 and 23 by using an emergency detour .
【０００５】分岐装置３２と端局２４間、分岐装置３２
と端局２３間に障害が発生した場合も同様にして光スイ
ッチ２６〜３１を切り替えて通信の確保を行う。[0005] Between the branching device 32 and the terminal station 24, the branching device 32
Similarly, when a failure occurs between the terminal station 23 and the terminal station 23, the optical switches 26 to 31 are switched to secure communication.
【０００６】[0006]
【発明が解決しようとする課題】この分岐装置を有する
従来の波長多重伝送方式では、分岐枝に障害が発生した
場合には、端局から分岐装置に信号を送信している分岐
装置内の光スイッチを切り替えることにより通信を確保
しているため、分岐装置の規模は大きくなり構成も複雑
である。また、光スイッチの切り替え前後では分岐損失
が異なる。その上、端局には分岐装置の光スイッチを切
り替えるための制御回路が必要となる。In a conventional wavelength division multiplexing transmission system having this branching device, when a failure occurs in a branch, an optical signal in the branching device transmitting a signal from the terminal station to the branching device is transmitted. Since communication is ensured by switching the switch, the size of the branching device is large and the configuration is complicated. The branch loss differs before and after the switching of the optical switch. In addition, the terminal station needs a control circuit for switching the optical switch of the branching device.
【０００７】本発明の目的は、分岐装置の構成が単純
で、規模も小さく、また、分岐装置内の各経路の分岐損
失が変化しない波長多重伝送方式を提供することにあ
る。It is an object of the present invention to provide a wavelength division multiplexing transmission system in which the configuration of a branching device is simple and small, and the branching loss of each path in the branching device does not change.
【０００８】[0008]
【課題を解決するための手段】本発明の波長多重伝送方
式は、一対の信号送信手段と信号受信手段を含む第１，
第２，・・・，第ｎ（ｎ≧２）の端局と、それぞれ第
１，第２，・・・，第ｎの端局との間で信号の送受信が
行なわれる第１，第２，・・・，第ｎのポートを有し、
第１の信号分岐手段と第１の信号合波手段，第２の信号
分岐手段と第２の信号合波手段，・・・，第ｎの信号分
岐手段と第ｎの信号合波手段がそれぞれ第１，第２，・
・・，第ｎのポートに設けられている分岐装置とからな
り、分岐装置の第ｉのポートと第ｊ（ｉ，ｊ＝１，２，
・・・，ｎ，ｉ≠ｊ）のポート間の波長帯域をＡij と
し、波長帯域Ａij 内で第ｉの端局から第ｊの端局への信
号の波長の数の最大値をＳijとし、波長帯域Ａ ij 内で第
ｊの端局から第ｉの端局への信号の波長の数の最大値を
Ｒ ij とし、第ｉの信号分岐手段は、波長帯域Ａ ij 内の波
長とこれと異なる波長帯域Ａ ik （ｋ＝１，２，・・・，
ｎ，ｋ≠ｉ≠ｊ）内の波長をそれぞれ第ｊの信号合波手
段、第ｋの信号合波手段へ分岐する手段であり、 第ｉの
信号合波手段は、波長帯域Ａ ij 内の波長の信号および波
長帯域Ａ ik 内の波長の信号を受信する手段であり、第ｉ
の信号分岐手段と接続される第ｉの端局は、波長帯域Ａ
ij 内で最大Ｓ ij 個の波長の信号および波長帯域Ａ ik 内で
最大Ｓ ik 個の波長の信号を送信する手段と、波長帯域Ａ
ij 内で最大Ｒ ij 個の波長の信号および波長帯域Ａ ik 内で
最大Ｒ ik 個の波長の信号を受信する手段と、波長帯域Ａ
ij 内の波長の信号と波長帯域Ａ ik 内の波長の信号を切り
替える手段を有し、波長帯域Ａ ij 内で最大Ｓ ij 個の波長
の信号のうちａ個（ａ≦Ｓ ij ）と波長帯域Ａ ik 内で最大
Ｓ ik 個の波長の信号のうちｂ個（ｂ≦Ｓ ik ）を第ｉの端
局から送信し、波長帯域Ａ ij 内で最大Ｒ ij 個の波長の信
号のうちａ個（ａ≦Ｒ ij ）と波長帯域 Ａ ik 内で最大Ｒ ik
個の波長の信号のうちｂ個（ｂ≦Ｒ ik ）を第ｉの端局に
て受信して通信を行なう波長多重伝送方式。SUMMARY OF THE INVENTION A wavelength division multiplexing transmission system according to the present invention comprises a first and a second signal transmission means including a pair of signal transmission means and signal reception means.
.., N-th (n ≧ 2) terminal stations and first, second,..., N-th terminal stations, respectively, for transmitting and receiving signals. ,..., N-th port,
The first signal branching unit and the first signal combining unit, the second signal branching unit and the second signal combining unit,..., The nth signal branching unit and the nth signal combining unit are respectively 1st, 2nd,
.., Comprising a branching device provided at the n-th port, the i-th port of the branching device and the j-th (i , j = 1, 2, 2,
.., N, i ≠ j ), the wavelength band between the ports is A ij, and the maximum value of the number of wavelengths of the signal from the i-th terminal to the j- th terminal in the wavelength band A ij Is S ij, and within the wavelength band A ij
The maximum value of the number of wavelengths of the signal from the terminal j to the terminal i is
R ij, and the i-th signal branching means includes a wave in the wavelength band A ij .
Length and a different wavelength band A ik (k = 1, 2,...,
n, k ≠ i ≠ j) are respectively assigned to the j-th signal
Stage, a means for branching the signal multiplexing means of the first k, of the i
The signal multiplexing means includes a signal and a wave having a wavelength within the wavelength band Aij .
Means for receiving a signal of a wavelength within the long band A ik ,
The i-th terminal connected to the signal branching unit of
Within ij , signals of up to S ij wavelengths and within wavelength band A ik
Means for transmitting signals of a maximum of S ik wavelengths;
Within ij , signals of up to R ij wavelengths and within wavelength band A ik
Means for receiving signals of a maximum of R ik wavelengths, and a wavelength band A
The signal of the wavelength in ij and the signal of the wavelength in the wavelength band Aik are cut off.
Having a maximum of S ij wavelengths within the wavelength band A ij .
A (a ≦ S ij ) of the signals and the maximum within the wavelength band A ik
Of the S ik wavelength signals, b (b ≦ S ik ) signals are assigned to the i-th end.
A station transmits a signal of up to R ij wavelengths within the wavelength band A ij .
A number (a ≦ R ij) and the maximum R ik in the wavelength band A ik of No.
B signals (b ≦ R ik ) of the i wavelength signals are transmitted to the i-th terminal.
Wavelength multiplexing transmission system for receiving and communicating .
【０００９】前記信号分岐手段は光カプラと光フィルタ
からなり、前記信号合波手段は光カプラからなる。The signal branching means comprises an optical coupler and an optical filter, and the signal multiplexing means comprises an optical coupler.
【００１０】本発明の波長多重伝送方式では、分岐枝に
障害が発生した場合に一部の送受信装置（端局に含まれ
る）の波長の切り替えを行い、分岐装置内での伝送路を
異なった２つ以上の波長にて接続する。In the wavelength division multiplexing transmission system of the present invention, when a failure occurs in a branch, the wavelength of some of the transmitting / receiving apparatuses (included in the terminal station) is switched, and the transmission path in the branching apparatus is changed. Connect at two or more wavelengths.
【００１１】[0011]
【発明の実施の形態】次に、本発明の実施の形態につい
て図面を参照して説明する。図１は、本発明の、３ポー
トを有する波長多重伝送方式の一実施例を示すブロック
図、図２（Ａ），（Ｂ）はそれぞれ図１の実施例の正常
時、障害発生時の接続を示す図である。Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of a wavelength division multiplexing transmission system having three ports according to the present invention, and FIGS. 2A and 2B show connection of the embodiment of FIG. FIG.
【００１２】端局１９は分岐装置２２のポートＰ１に接
続され、端局２０は分岐装置２２のポートＰ２に接続さ
れ、端局２１は分岐装置２２のポートＰ３に接続されて
いる。端局１９の送信部１は分岐装置２２のポートＰ１
の送信側の光カプラ７に接続されている。光カプラ７は
２つに分岐しており、２つの分岐先には光フィルタ８、
光フィルタ９が接続されている。光フィルタ８は分岐装
置２２のポートＰ２の受信側の光カプラ１４に接続され
ている。光カプラ１４には分岐装置２２のポートＰ３の
送信部３の光フィルタ１７も接続されていて、光カプラ
１４により結合される。光カプラ１４は分岐装置２２の
ポートＰ２の受信部となり、端局２０の受信部３と接続
されている。光フィルタ９は分岐装置２２のポートＰ３
の受信側の光カプラ１８に接続されている。光カプラ１
８には分岐装置２２のポートＰ２の送信部の光フィルタ
１２も接続されていて、光カプラ１８により結合され
る。光カプラ１８は分岐装置２２のポートＰ３の受信部
となり端局２１の受信部５と接続されている。端局２０
の送信部４は分岐装置２２のポートＰ２の送信側の光カ
プラ１１に接続されている。光カプラ１１は２つに分岐
しており、２つの分岐先には光フィルタ１２、光フィル
タ１３が接続されている。光フィルタ１３は分岐装置２
２のポートＰ１の受信側の光カプラ１０に接続されてい
る。光カプラ１０には分岐装置２２のポートＰ３の送信
部の光フィルタ１６も接続されていて、光カプラ１０に
より結合されている。光カプラ１０は分岐装置２２のポ
ートＰ１の受信部となり端局１９の受信部２と接続され
ている。端局２１の送信部６は分岐装置２２のポートＰ
３の送信側の光カプラ１５に接続されている。光カプラ
１５は２つに分岐しており、２つの分岐先には光フィル
タ１６、光フィルタ１７が接続されている。分岐装置２
２のポートＰ１とポートＰ２間は光フィルタ８、１３に
より波長（搬送波長）λ１、λ２で通信可能、ポートＰ
２とポートＰ３間は光フィルタ１２、１７により波長
（搬送波長）λ３、λ４で通信可能、ポートＰ３とポー
トＰ１間は光フィルタ１６、９により波長λ５、λ６で
通信可能である。すなわち、端局１９→端局２０への波
長数、端局２０から端局２１への波長数、端局２１→端
局１９への波長数の最大値はいずれも２である。また、
各端局１９、２０、２１から出力される信号波長範囲λ
１〜λ２、λ３〜λ４、λ５〜λ ６は互いに重ならない
関係にある。 The terminal station 19 is connected to the port P1 of the branching device 22, the terminal station 20 is connected to the port P2 of the branching device 22, and the terminal station 21 is connected to the port P3 of the branching device 22. The transmitting unit 1 of the terminal station 19 is connected to the port P1 of the branching device 22.
Is connected to the optical coupler 7 on the transmission side. The optical coupler 7 branches into two, and an optical filter 8 is connected to the two branch destinations.
The optical filter 9 is connected. The optical filter 8 is connected to the optical coupler 14 on the receiving side of the port P2 of the branching device 22. The optical coupler 14 is also connected to the optical filter 17 of the transmission unit 3 at the port P3 of the branching device 22 and is coupled by the optical coupler 14. The optical coupler 14 serves as a receiving unit of the port P2 of the branching device 22, and is connected to the receiving unit 3 of the terminal station 20. The optical filter 9 is connected to the port P3 of the branching device 22.
Is connected to the optical coupler 18 on the receiving side. Optical coupler 1
The optical filter 12 of the transmitting section of the port P2 of the branching device 22 is also connected to 8 and is connected by an optical coupler 18. The optical coupler 18 serves as a receiver of the port P3 of the branching device 22 and is connected to the receiver 5 of the terminal station 21. Terminal 20
Is connected to the optical coupler 11 on the transmitting side of the port P2 of the branching device 22. The optical coupler 11 branches into two, and an optical filter 12 and an optical filter 13 are connected to the two branch destinations. The optical filter 13 is a branching device 2
The second port P1 is connected to the optical coupler 10 on the receiving side. The optical coupler 16 is also connected to the optical filter 16 of the transmitting section at the port P3 of the branching device 22 and is coupled by the optical coupler 10. The optical coupler 10 serves as a receiver of the port P1 of the branching device 22 and is connected to the receiver 2 of the terminal station 19. The transmitting unit 6 of the terminal station 21 is connected to the port P of the branching device 22.
3 is connected to the optical coupler 15 on the transmitting side. The optical coupler 15 branches into two, and an optical filter 16 and an optical filter 17 are connected to the two branch destinations. Branching device 2
2 between ports P1 and P2 can communicate with optical filters 8 and 13 at wavelengths (carrier wavelengths ) λ1 and λ2.
The wavelength between port 2 and port P3 is controlled by optical filters 12 and 17.
(Carrier wavelength) Communication is possible at λ3 and λ4, and communication between ports P3 and P1 is possible at wavelengths λ5 and λ6 by optical filters 16 and 9. That is, the wave from terminal station 19 to terminal station 20
Long number, number of wavelengths from terminal station 20 to terminal station 21, terminal station 21 → terminal
The maximum value of the number of wavelengths to the station 19 is 2 in each case. Also,
Signal wavelength range λ output from each terminal station 19, 20, 21
1 to λ2, λ3 to λ4, λ5 to λ6 do not overlap each other
In a relationship.
【００１３】端局１９の送信部１は波長λ１、λ５また
はλ１、λ２またはλ５、λ６で送信可能、受信部２は
波長λ１、λ５またはλ１、λ２またはλ５、λ６で受
信可能である。端局２０の送信部３は波長λ１、λ３ま
たはλ１、λ２またはλ３、λ４で送信可能、受信部４
は波長λ１、λ３またはλ１、λ２またはλ３、λ４で
受信可能である。端局２１の送信部５は波長λ３、λ５
またはλ３、λ４またはλ５、λ６で送信可能、受信部
６は波長λ３、λ５またはλ３、λ４またはλ５、λ６
で受信可能である。また、端局１９と端局２０間は波長
λ１、λ２で通信可能、端局２０と端局２１間は波長λ
３、λ４で通信可能、端局２１と端局１９間は波長λ
５、λ６で通信可能となっている。The transmitting section 1 of the terminal station 19 can transmit at the wavelength λ1, λ5 or λ1, λ2 or λ5, λ6, and the receiving section 2 can receive at the wavelength λ1, λ5 or λ1, λ2 or λ5, λ6. The transmitting unit 3 of the terminal station 20 can transmit at the wavelength λ1, λ3 or λ1, λ2 or λ3, λ4, the receiving unit 4
Can be received at wavelengths λ1, λ3 or λ1, λ2 or λ3, λ4. The transmitting unit 5 of the terminal station 21 has wavelengths λ3, λ5
Or λ3, λ4 or λ5, λ6, and the receiving unit 6 can transmit the wavelength λ3, λ5 or λ3, λ4 or λ5, λ6.
Can be received. In addition, communication between the terminal stations 19 and 20 is possible at wavelengths λ1 and λ2, and between the terminal stations 20 and 21 is wavelength λ.
3, communication is possible at λ4, wavelength between terminal station 21 and terminal station 19 is λ
5, and communication is possible at λ6.
【００１４】次に、３ポートを有する本システムの動作
について図２により説明する。通常、図２（Ａ）に示す
ように端局１９は波長λ１、λ５で送受信し、端局２０
は波長λ１、λ３で送受信し、端局２１は波長λ３、λ
５で送受信する。端局１９と端局２０間は波長λ１、端
局２０と端局２１間は波長λ３、端局２１と端局１９間
は波長λ５により同時に通信を行っている。端局１９か
ら送信された波長λ１の信号は分岐装置２２の光カプラ
７、光フィルタ８を通過し光カプラ１４を介して端局２
０に受信される。光カプラ７により波長λ１の信号は光
フィルタ９側にも分岐するが、光フィルタ９は波長λ１
の信号は通過しない帯域となっているため端局２１方向
に波長λ１の信号は伝わらない。また、端局１９から送
信された波長λ５の信号は分岐装置２２の光カプラ７、
光フィルタ９を通過し光カプラ１８を介して端局２１に
受信される。光カプラ７により波長λ５の信号は光フィ
ルタ８側にも分岐するが、光フィルタ８は波長λ５の信
号は通過しない帯域となっているため端局２０方向に波
長λ５の信号は伝わらない。端局２０、端局２１から送
信される波長の通信経路についても同様である。Next, the operation of the present system having three ports will be described with reference to FIG. Normally, as shown in FIG. 2A, the terminal station 19 transmits and receives at wavelengths λ1 and λ5,
Transmits and receives at the wavelengths λ 1 and λ 3 , and the terminal station 21 transmits the wavelengths λ 3 and λ 3
5 to send and receive. The terminal 19 and the terminal 20 communicate with each other at the wavelength λ1, the terminal 20 and the terminal 21 communicate with the wavelength λ3, and the terminal 21 and the terminal 19 communicate with the wavelength λ5 at the same time. The signal of the wavelength λ1 transmitted from the terminal station 19 passes through the optical coupler 7 and the optical filter 8 of the branching device 22 and passes through the optical coupler 14 to the terminal station 2.
0 is received. The signal of wavelength λ1 is also branched by the optical coupler 7 to the optical filter 9 side.
The signal of the wavelength λ1 is not transmitted to the terminal station 21 because the band of the signal does not pass through. The signal of wavelength λ5 transmitted from the terminal station 19 is transmitted to the optical coupler 7 of the branching device 22,
The light passes through the optical filter 9 and is received by the terminal station 21 via the optical coupler 18. Although the signal of the wavelength λ5 is also branched by the optical coupler 7 to the optical filter 8 side, the signal of the wavelength λ5 is not transmitted to the terminal station 20 because the optical filter 8 has a band in which the signal of the wavelength λ5 does not pass. The same applies to communication paths of wavelengths transmitted from the terminal stations 20 and 21.
【００１５】ここで、分岐装置２２と端局２１間に障害
が発生した場合（図２（Ｂ））、端局１９の送受信部は
波長λ５を波長λ２に切り替え、端局２０の送受信部は
波長λ３を波長λ２に切り替えることによって、波長λ
２により端局１９と端局２０間の伝送路が追加され、分
岐装置２２を介さない、迂回経路として通常設けられて
いる別経路を用いて端局２０と端局２１間、端局２１と
端局１９間の通信を確保することが可能となる。Here, when a failure occurs between the branching device 22 and the terminal station 21 (FIG. 2B), the transmitting / receiving section of the terminal station 19 switches the wavelength λ5 to the wavelength λ2, and the transmitting / receiving section of the terminal station 20 By switching the wavelength λ3 to the wavelength λ2, the wavelength λ3
Transmission path between the end stations 19 and the terminal station 20 are added by 2, min
Usually provided as a detour path without going through the branch device 22
Between the end stations 20 and terminal stations 21 using another path it is, it is possible to ensure the communication between the terminal stations 21 and terminal station 19.
【００１６】分岐装置２２と端局２０間、分岐装置２２
と端局１９間に障害が発生した場合も同様にして各端局
の送受信部の波長を切り替えて通信の確保を行う。Between the branching device 22 and the terminal 20;
Similarly, when a failure occurs between the terminal station 19 and the terminal station 19, communication is ensured by switching the wavelength of the transmission / reception unit of each terminal station.
【００１７】[0017]
【発明の効果】以上説明したように、本発明は、分岐枝
に障害が発生した場合に一部の送受信装置（端局に含ま
れる）の波長の切り替えを行い、分岐装置内での伝送路
を異なった２つ以上の波長にて接続することにより、分
岐装置の構成が単純となり、規模も縮小化され、また、
分岐装置内の各経路の分岐損失は変化しないという効果
がある。As described above, according to the present invention, when a failure occurs in a branch, the wavelength of some transmitting / receiving apparatuses (included in the terminal station) is switched, and the transmission path in the branching apparatus is changed. Are connected at two or more different wavelengths, the configuration of the branching device is simplified, the scale is reduced, and
There is an effect that the branch loss of each path in the branch device does not change.
【図１】本発明の波長多重伝送方式の一実施例を示すブ
ロック図である。FIG. 1 is a block diagram showing one embodiment of a wavelength division multiplexing transmission system according to the present invention.
【図２】図１の実施例の正常時（図２（Ａ））と障害時
（図２（Ｂ））の接続を示す図である。FIG. 2 is a diagram showing connections between a normal state (FIG. 2A) and a fault state (FIG. 2B) in the embodiment of FIG. 1;
【図３】波長多重伝送方式の従来例を示すブロック図で
ある。FIG. 3 is a block diagram showing a conventional example of a wavelength division multiplexing transmission system.
１，４，６ 送信部 ２，３，５ 受信部 ７，１０，１１，１４，１５，１８ 光カプラ ８，９，１２，１３，１６，１７ 光フィルタ １９〜２１ 端局 ２２ 分岐装置 ２３〜２５ 端局 ２６〜３１ 光スイッチ ３２ 分岐装置 Ｐ１，Ｐ２，Ｐ３ ポート λ１，λ２，λ３，λ５ 波長 1,4,6 Transmitting unit 2,3,5 Receiving unit 7,10,11,14,15,18 Optical coupler 8,9,12,13,16,17 Optical filter 19-21 Terminal station 22 Branching device 23- 25 terminal station 26-31 optical switch 32 branching device P1, P2, P3 port λ1, λ2, λ3, λ5 wavelength
Claims (2)
む第１，第２，・・・，第ｎ（ｎ≧２）の端局と、 それぞれ第１，第２，・・・，第ｎの端局との間で信号
の送受信が行なわれる第１，第２，・・・，第ｎのポー
トを有し、第１の信号分岐手段と第１の信号合波手段，
第２の信号分岐手段と第２の信号合波手段，・・・，第
ｎの信号分岐手段と第ｎの信号合波手段がそれぞれ第
１，第２，・・・，第ｎのポートに設けられている分岐
装置とからなり、 分岐装置の第ｉのポートと第ｊ（ｉ，ｊ＝１，２，・・
・，ｎ，ｉ≠ｊ）のポート間の波長帯域をＡij とし、波
長帯域Ａij内で第ｉの端局から第ｊの端局への信号の波
長の数の最大値をＳ ijとし、波長帯域Ａ ij 内で第ｊの端
局から第ｉの端局への信号の波長の数の最大値をＲ ij と
し、第ｉの信号分岐手段は、波長帯域Ａ ij 内の波長とこれと
異なる波長帯域Ａ ik （ｋ＝１，２，・・・，ｎ，ｋ≠ｉ
≠ｊ）内の波長をそれぞれ第ｊの信号合波手段、第ｋの
信号合波手段へ分岐する手段であり、 第ｉの信号合波手段は、波長帯域Ａ ij 内の波長の信号お
よび波長帯域Ａ ik 内の波長の信号を受信する手段であ
り、 第ｉの信号分岐手段と接続される第ｉの端局は、波長帯
域Ａ ij 内で最大Ｓ ij 個の波長の信号および波長帯域Ａ ik
内で最大Ｓ ik 個の波長の信号を送信する手段と、波長帯
域Ａ ij 内で最大Ｒ ij 個の波長の信号および波長帯域Ａ ik
内で最大Ｒ ik 個の波長の信号を受信する手段と、波長帯
域Ａ ij 内の波長の信号と波長帯域Ａ ik 内の波長の信号を
切り替える手段を有し、 波長帯域Ａ ij 内で最大Ｓ ij 個の波長の信号のうちａ個
（ａ≦Ｓ ij ）と波長帯域Ａ ik 内で最大Ｓ ik 個の波長の信
号のうちｂ個（ｂ≦Ｓ ik ）を第ｉの端局から送信し、 波長帯域Ａ ij 内で最大Ｒ ij 個の波長の信号のうちａ個
（ａ≦Ｒ ij ）と波長帯域Ａ ik 内で最大Ｒ ik 個の波長の信
号のうちｂ個（ｂ≦Ｒ ik ）を第ｉの端局にて受信して通
信を行なう 波長多重伝送方式。A first, second,..., N-th (n ≧ 2) terminal stations including a pair of signal transmitting means and a signal receiving means; .., n-th ports for transmitting and receiving signals to and from the n-th terminal, the first signal branching means and the first signal multiplexing means,
, The n-th signal branching means and the n-th signal combining means are respectively connected to the first, second,..., N-th ports. , And an i-th port of the branching device and a j-th (i , j = 1, 2,...)
·, N, i ≠ j a wavelength band between ports) and A i j, wavelength band A in a ij from the end station of the i number of the wavelength of the signal to the terminal station of the j maximum value S ij And the j-th end in the wavelength band A ij
The maximum number of wavelengths of the signal to the terminal station of the i and R ij from the station, signal branching means i-th, and the this wavelength in the wavelength band A ij
Different wavelength bands A ik (k = 1, 2,..., N, k ≠ i
波長 j) are respectively assigned to the j-th signal combining means and the k-th
A means for branching the signal multiplexing means, the signal combining means of the i is our wavelength signals in the wavelength band A ij
And a means for receiving signals of wavelengths within the wavelength band Aik .
Ri, end station of the i connected to the signal branching means i-th wavelength band
Signals of a maximum of S ij wavelengths in the range A ij and the wavelength band A ik
Means for transmitting signals of a maximum of S ik wavelengths within a wavelength band
Signals of a maximum of R ij wavelengths in the range A ij and the wavelength band A ik
Means for receiving signals of a maximum of R ik wavelengths within a wavelength band
A signal having a wavelength within the range A ij and a signal having a wavelength within the wavelength band A ik
Means for switching, a signal out of a maximum of S ij wavelength signals in the wavelength band A ij
(A ≦ S ij) and the maximum S ik number of signal wavelengths in the wavelength band A ik
B (b ≦ S ik ) of the signals are transmitted from the i-th terminal , and a out of the signals of the maximum R ij wavelengths in the wavelength band A ij
(A ≦ R ij) and the maximum R ik number of signal wavelengths in the wavelength band A ik
B (b ≦ R ik ) are received by the i-th terminal and transmitted.
Wavelength multiplexing transmission method for performing signal.
タからなり、前記信号合波手段が光カプラからなる請求
項１記載の波長多重伝送方式。2. A wavelength division multiplexing transmission system according to claim 1, wherein said signal branching means comprises an optical coupler and an optical filter, and said signal multiplexing means comprises an optical coupler.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7223640A JP2973886B2 (en) | 1995-08-31 | 1995-08-31 | WDM transmission system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7223640A JP2973886B2 (en) | 1995-08-31 | 1995-08-31 | WDM transmission system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0969813A JPH0969813A (en) | 1997-03-11 |
| JP2973886B2 true JP2973886B2 (en) | 1999-11-08 |
Family
ID=16801367
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7223640A Expired - Lifetime JP2973886B2 (en) | 1995-08-31 | 1995-08-31 | WDM transmission system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2973886B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013128556A1 (en) * | 2012-02-27 | 2013-09-06 | 富士通株式会社 | Optical-signal splitting device, and optical transmission system |
| JPWO2013128556A1 (en) * | 2012-02-27 | 2015-07-30 | 富士通株式会社 | Optical signal branching apparatus and optical transmission system |
-
1995
- 1995-08-31 JP JP7223640A patent/JP2973886B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0969813A (en) | 1997-03-11 |
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