JPH0969813A - Multiplex wavelength transmitting system - Google Patents
Multiplex wavelength transmitting systemInfo
- Publication number
- JPH0969813A JPH0969813A JP7223640A JP22364095A JPH0969813A JP H0969813 A JPH0969813 A JP H0969813A JP 7223640 A JP7223640 A JP 7223640A JP 22364095 A JP22364095 A JP 22364095A JP H0969813 A JPH0969813 A JP H0969813A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- wavelength
- wavelengths
- wavelength band
- terminal station
- 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.)
- Granted
Links
Abstract
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 WDM transmission system, and more particularly to a WDM 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 method has been used for the purpose of ensuring 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 3-port branching device. The terminal station 23 is connected to the port P1 of the branching device 32, and the terminal station 24
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. Further, the inside of the branching device 32 is connected so that the three ports P1 to P3 can communicate with each other. Optical switches 26 to 31 are connected between all 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、端局２４と端局２５間、端局２
５と端局２３は、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、３
１、および端局２４と端局２５間の光スイッチ２８、２
９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間の伝送路が追加さ
れ、別経路を用いて端局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,
Terminal station 23 and terminal station 24, terminal station 24 and terminal station 25, terminal station 2
5 and the terminal station 23 can communicate at the same time. Here, when a failure occurs between the branch device 32 and the terminal station 25, the optical switches 30, 3 between the terminal station 25 and the terminal station 23 in the branch device 32.
1, and optical switches 28, 2 between the terminal stations 24 and 25.
Signals for switching 9 are transmitted from the terminal stations 23 and 24 to perform switching. After switching the optical switches 28, 29, 30, and 31, a transmission line between the terminal stations 23 and 24 is added, and another path is used between the terminal stations 24 and 25 and between the terminal stations 25 and 23. It becomes possible to secure communication.
【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。Between the branch device 32 and the terminal station 24, the branch device 32
When a failure occurs between the terminal station 23 and the terminal station 23, the optical switches 26 to 31 are similarly 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 the conventional wavelength division multiplex transmission system having this branching device, when a failure occurs in the branching branch, the optical signal in the branching device which transmits a signal from the terminal station to the branching device. Since the communication is secured by switching the switch, the scale of the branching device is large and the configuration is complicated. In addition, the branch loss before and after the switching of the optical switch is different. Moreover, the terminal station requires 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。An object of the present invention is to provide a wavelength division multiplex transmission system in which the branching device has a simple structure and a small scale, 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（ｉ＋１）（ｉ＝１，
２，・・・，ｎ−１）のポート間の波長帯域をＡi と
し、波長帯域Ａi 内で第ｉの端局から第（ｉ＋１）の端
局への信号の波長の数の最大値をｓi とし、波長帯域Ａ
i 内で第（ｉ＋１）の端局から第ｉの端局への信号の波
長の数の最大値をｒi とすると、第ｉの信号分岐手段
は、波長帯域Ａ(i-1) 内の波長とこれと異なる波長帯域
Ａ i 内の波長をそれぞれ第（ｉ−１）の信号合波手段、
第（ｉ＋１）の信号合波手段に分岐する手段と、波長帯
域Ａ(i-1) 内で最大ｒ(i-1) 個の波長の信号および波長
帯域Ａi 内で最大ｓi 個の波長の信号を送信する手段
と、波長帯域Ａ(i-1)内の波長の信号と波長帯域Ａi 内
の波長の信号を切り替える手段を含み、第ｉの信号合波
手段は、波長帯域Ａ(i-1) 内で最大ｓ(i-1) 個の波長の
信号および波長帯域Ａi 内で最大ｒ(i+1) 個の波長の信
号を受信する手段と、波長帯域Ａ(i-1) 内の波長の信号
と波長帯域Ａi 内の波長の信号を切り替える手段を含
み、波長帯域Ａ(i-1) 内で最大ｒ(i-1) 個の波長の信号
のうちｈ個（ｈ≦ｒ(i-1)）の波長の信号と波長帯域Ａi
内で最大ｓi 個の波長の信号のうちｊ個（ｊ≦ｓ i ）
の波長の信号を第ｉの信号分岐手段から送信し、波長帯
域Ａ(i-1) 内で最大ｒ(i-1) 個の波長の信号のうちｈ個
（ｈ≦ｒ(i-1)）の波長の信号と波長帯域Ａ(i-2) 内で
最大ｓ(i-2) 個の波長の信号のうちｋ個（ｋ≦ｓ
(i-2) ）の波長の信号を第（ｉ−１）の信号合波手段で
受信し、波長帯域Ａi 内で最大ｓi 個の波長の信号のう
ちｊ個（ｊ≦ｓi ）の波長の信号と波長帯域Ａ(i+1) 内
で最大ｒ(i+1) 個の波長の信号のうちｍ個（ｍ≦ｒ(i+1
) ）の波長の信号を第（ｉ＋１）の信号合波手段で受信
して通信を行う。A wavelength division multiplexing method of the present invention
The expression is a first, including a pair of signal transmitting means and signal receiving means,
The second, ..., Nth (n ≧ 2) terminal stations,
1, 2, ..., Sending / receiving signals to / from the nth terminal station
Has the 1st, 2nd, ..., nth ports,
First signal branching means, first signal combining means, second signal
Branching means and second signal combining means, ..., nth signal component
The dividing means and the n-th signal combining means are respectively the first, second, ...
..Consist of a branching device provided at the n-th port
, The i-th port of the branching device and the (i + 1) -th (i = 1, 1
2, ..., N-1), the wavelength band between ports is Ai When
Wavelength band Ai Within the i-th terminal to the (i + 1) -th terminal
The maximum number of wavelengths of signals to the station is si And wavelength band A
i A signal wave from the (i + 1) th terminal station to the i-th terminal station in
The maximum value of the number of lengths is ri Then, the i-th signal branching means
Is the wavelength band A(i-1) Wavelengths within and different wavelength bands
A i The respective wavelengths within the (i-1) th signal combining means,
Means for branching to the (i + 1) th signal combining means and a wavelength band
Area A(i-1) Within r(i-1) Signals and wavelengths of wavelengths
Band Ai Maximum of si Means for transmitting signals of individual wavelengths
And wavelength band A(i-1)Signal of wavelength inside and wavelength band Ai Inside
Including the means for switching signals of the wavelength
The means is the wavelength band A(i-1) Maximum of s(i-1) Of wavelengths
Signal and wavelength band Ai Within r(i + 1) Wavelengths
Signal receiving means and wavelength band A(i-1) Signal of wavelength within
And wavelength band Ai Including means for switching signals of wavelengths within
Wavelength band A(i-1) Within r(i-1) Signals of wavelengths
Out of them (h ≦ r(i-1)) Wavelength signal and wavelength band Ai
Maximum of si J out of signals of wavelengths (j ≦ s i )
Signal of the wavelength is transmitted from the i-th signal branching means,
Area A(i-1) Within r(i-1) H out of the signals of each wavelength
(H ≦ r(i-1)) Wavelength signal and wavelength band A(i-2) At the inner
Maximum s(i-2) K signals (k ≦ s
(i-2) ) Signal of the wavelength) by the (i-1) th signal combining means.
Receive and wavelength band Ai Maximum of si Signal of individual wavelengths
J j (j ≤ si ) Wavelength signal and wavelength band A(i + 1) Inside
Up to r(i + 1) M of the signals of the wavelengths (m ≦ r(i + 1
) ) Wavelength signal is received by the (i + 1) th signal combining means.
And communicate.
【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 combining means comprises an optical coupler.
【００１０】[0010]
【発明の実施の形態】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。BEST MODE FOR CARRYING OUT THE INVENTION In the wavelength division multiplexing transmission system of the present invention,
When a failure occurs in a branch, the wavelengths of some of the transmitting / receiving devices (included in the terminal station) are switched, and the transmission lines in the branching device are connected with two or more different wavelengths.
【００１１】[0011]
【実施例】次に、本発明の実施例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, embodiments of the present invention will be described with reference to the drawings. 1 is a block diagram showing an embodiment of a wavelength division multiplexing transmission system having three ports of the present invention, FIG.
FIGS. 3A and 3B are diagrams showing connections in the embodiment of FIG. 1 when normal and when a failure occurs.
【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λ１、λ２で通信可能、ポートＰ２とポートＰ
３間は光フィルタ１２、１７により波長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。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 transmission unit 1 of the terminal station 19 uses the port P1 of the branching device 22.
Is connected to the optical coupler 7 on the transmission side. The optical coupler 7 is branched into two, and an optical filter 8,
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 filter 14 of the transmitter 3 of the port P3 of the branching device 22 is also connected to the optical coupler 14 and is coupled by the optical coupler 14. The optical coupler 14 serves as a receiver of the port P2 of the branching device 22 and is connected to the receiver 3 of the terminal station 20. The optical filter 9 is 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 transmission unit of the port P2 of the branching device 22 is also connected to the optical fiber 8 and is coupled by the 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 transmission side of the port P2 of the branching device 22. The optical coupler 11 is branched into two, and an optical filter 12 and an optical filter 13 are connected to the two branch destinations. The optical filter 13 is the branching device 2
It is connected to the optical coupler 10 on the receiving side of the second port P1. The optical filter 16 of the transmitter of the port P3 of the branching device 22 is also connected to the optical coupler 10 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 transmitter 6 of the terminal station 21 uses the port P of the branching device 22.
3 is connected to the optical coupler 15 on the transmission side. The optical coupler 15 is branched into two, and an optical filter 16 and an optical filter 17 are connected to the two branch destinations. Branching device 2
The optical filters 8 and 13 can communicate between the two ports P1 and P2 at wavelengths λ1 and λ2.
3 can communicate with the optical filters 12 and 17 at wavelengths λ3 and λ4. Between the port P3 and the port P1, the optical filter 16 and
9 enables communication at wavelengths λ5 and λ6.
【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 transmitter 1 of the terminal station 19 can transmit at wavelengths λ1, λ5 or λ1, λ2 or λ5, λ6, and the receiver 2 can receive at wavelengths λ1, λ5 or λ1, λ2 or λ5, λ6. The transmitter 3 of the terminal station 20 can transmit at wavelengths λ1, λ3 or λ1, λ2 or λ3, λ4, and the receiver 4
Can be received at wavelengths λ1, λ3 or λ1, λ2 or λ3, λ4. The transmitter 5 of the terminal station 21 has wavelengths λ3 and λ5.
Alternatively, it is possible to transmit at λ3, λ4 or λ5, λ6, and the receiving unit 6 has wavelengths λ3, λ5 or λ3, λ4 or λ5, λ6.
Can be received at. Further, the terminal stations 19 and 20 can communicate at wavelengths λ1 and λ2, and the terminal stations 20 and 21 can communicate at wavelengths λ.
3, communication is possible at λ4, wavelength λ between terminal station 21 and terminal station 19
Communication is possible at 5 and 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λ３、λ５で送受信し、端局２１は波長λ５、λ
１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 this 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, and the terminal station 20
Are transmitted and received at wavelengths λ3 and λ5, and the terminal station 21 transmits wavelengths λ5 and λ5.
1 to send and receive. The terminal station 19 and the terminal station 20 simultaneously communicate with a wavelength λ1, the terminal station 20 and the terminal station 21 with a wavelength λ3, and the terminal stations 21 and 19 simultaneously with a wavelength λ5. The signal of 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
Received at 0. Although the signal of wavelength λ1 is branched to the optical filter 9 side by the optical coupler 7, the optical filter 9 has a wavelength of λ1.
The signal of wavelength λ1 is not transmitted in the direction of the terminal station 21 because it is in a band that does not pass the signal of. Further, the signal of wavelength λ5 transmitted from the terminal station 19 is transmitted to the optical coupler 7 of the branching device 22,
It passes through the optical filter 9 and is received by the terminal station 21 via the optical coupler 18. Although the signal of wavelength λ5 is branched to the optical filter 8 side by the optical coupler 7, the signal of wavelength λ5 is not transmitted in the direction of the terminal station 20 because the optical filter 8 has a band in which the signal of 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、別
経路を用いて端局２０と端局２１間、端局２１と端局１
９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 transmitter / receiver of the terminal station 19 switches the wavelength λ5 to the wavelength λ2, and the transmitter / receiver of the terminal station 20. By switching the wavelength λ3 to the wavelength λ2,
2 adds a transmission line between the terminal station 19 and the terminal station 20, and another path is used between the terminal station 20 and the terminal station 21, and between the terminal station 21 and the terminal station 1.
It is possible to secure the communication of 9.
【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 branch device 22 and the terminal station 20, the branch device 22
Similarly, when a failure occurs between the terminal station 19 and the terminal station 19, the wavelengths of the transmission / reception units of the respective terminal stations are switched to secure communication.
【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 wavelengths of some of the transmitting / receiving devices (included in the terminal stations) are switched, and the transmission line in the branching device is switched. Connecting two or more different wavelengths simplifies the structure of the branching device and reduces the scale.
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 an embodiment of a wavelength division multiplexing transmission system of 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 a connection in a normal case (FIG. 2A) and a failure case (FIG. 2B) in the embodiment of FIG.
【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 Transmitter 2, 3, 5 Receiver 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（ｉ＋１）（ｉ＝１，２，
・・・，ｎ−１）のポート間の波長帯域をＡi とし、波
長帯域Ａi 内で第ｉの端局から第（ｉ＋１）の端局への
信号の波長の数の最大値をｓi とし、波長帯域Ａi 内で
第（ｉ＋１）の端局から第ｉの端局への信号の波長の数
の最大値をｒi とすると、 第ｉの信号分岐手段は、波長帯域Ａ(i-1) 内の波長とこ
れと異なる波長帯域Ａ i 内の波長をそれぞれ第（ｉ−
１）の信号合波手段、第（ｉ＋１）の信号合波手段に分
岐する手段と、波長帯域Ａ(i-1) 内で最大ｒ(i-1) 個の
波長の信号および波長帯域Ａi 内で最大ｓi 個の波長の
信号を送信する手段と、波長帯域Ａ(i-1)内の波長の信
号と波長帯域Ａi 内の波長の信号を切り替える手段を含
み、第ｉの信号合波手段は、波長帯域Ａ(i-1) 内で最大
ｓ(i-1) 個の波長の信号および波長帯域Ａi 内で最大ｒ
(i+1) 個の波長の信号を受信する手段と、波長帯域Ａ
(i-1)内の波長の信号と波長帯域Ａi 内の波長の信号を
切り替える手段を含み、 波長帯域Ａ(i-1) 内で最大ｒ(i-1) 個の波長の信号のう
ちｈ個（ｈ≦ｒ(i-1)）の波長の信号と波長帯域Ａi 内
で最大ｓi 個の波長の信号のうちｊ個（ｊ≦ｓ i ）の波
長の信号を第ｉの信号分岐手段から送信し、 波長帯域Ａ(i-1) 内で最大ｒ(i-1) 個の波長の信号のう
ちｈ個（ｈ≦ｒ(i-1)）の波長の信号と波長帯域Ａ(i-2)
内で最大ｓ(i-2) 個の波長の信号のうちｋ個（ｋ≦ｓ
(i-2) ）の波長の信号を第（ｉ−１）の信号合波手段で
受信し、 波長帯域Ａi 内で最大ｓi 個の波長の信号のうちｊ個
（ｊ≦ｓi ）の波長の信号と波長帯域Ａ(i+1) 内で最大
ｒ(i+1) 個の波長の信号のうちｍ個（ｍ≦ｒ(i+1 ) ）の
波長の信号を第（ｉ＋１）の信号合波手段で受信して通
信を行う波長多重伝送方式。1. A pair of signal transmitting means and signal receiving means are included.
, The nth (n ≧ 2) terminal station and the first, second, ..., nth terminal station, respectively.
, 1st, 2nd, ...
A first signal branching means and a first signal combining means,
Second signal branching means and second signal combining means, ...,
n signal branching means and nth signal combining means are respectively
1, 2, ..., Branches provided at the nth port
And an i-th port of the branching device and an (i + 1) -th (i = 1, 2,
..., n-1) the wavelength band between the ports is Ai And then the waves
Long band Ai From the i-th terminal to the (i + 1) th terminal
The maximum number of signal wavelengths is si And wavelength band Ai At the inner
Number of wavelengths of signals from the (i + 1) th terminal station to the i-th terminal station
The maximum value of ri Then, the i-th signal branching unit determines the wavelength band A(i-1) Inside wavelength
Different wavelength band A i The wavelengths within are (i-
1) signal combining means and (i + 1) th signal combining means
Diversifying means and wavelength band A(i-1) Within r(i-1) Of
Wavelength signal and wavelength band Ai Maximum of si Of wavelengths
Means for transmitting signals and wavelength band A(i-1)Within the wavelength
No. and wavelength band Ai Including means for switching signals of wavelengths within
The i-th signal combining means is the wavelength band A(i-1) Maximum of
s(i-1) Signal of wavelengths and wavelength band Ai Within r
(i + 1) Means for receiving signals of individual wavelengths and wavelength band A
(i-1)Signal of wavelength inside and wavelength band Ai Signal of wavelength within
Including means for switching, wavelength band A(i-1) Within r(i-1) Signal of individual wavelengths
H h (h ≦ r(i-1)) Wavelength signal and wavelength band Ai Inside
Up to si J out of signals of wavelengths (j ≦ s i ) Wave
A long signal is transmitted from the i-th signal branching unit, and the wavelength band A(i-1) Within r(i-1) Signal of individual wavelengths
H h (h ≦ r(i-1)) Wavelength signal and wavelength band A(i-2)
Maximum of s(i-2) K signals (k ≦ s
(i-2) ) Signal of the wavelength) by the (i-1) th signal combining means.
Receive and wavelength band Ai Maximum of si J out of the signals of each wavelength
(J ≦ si ) Wavelength signal and wavelength band A(i + 1) Maximum of
r(i + 1) M of the signals of the wavelengths (m ≦ r(i + 1 ) )of
The signal of the wavelength is received by the (i + 1) th signal combining means and transmitted.
A wavelength division multiplexing transmission method.
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. The 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 true JPH0969813A (en) | 1997-03-11 |
| JP2973886B2 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) |
Cited By (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
Cited By (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 |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2973886B2 (en) | 1999-11-08 |
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