JP3739643B2 - Optical wavelength division multiplexing transmission method and apparatus - Google Patents

Optical wavelength division multiplexing transmission method and apparatus Download PDF

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JP3739643B2
JP3739643B2 JP2000272043A JP2000272043A JP3739643B2 JP 3739643 B2 JP3739643 B2 JP 3739643B2 JP 2000272043 A JP2000272043 A JP 2000272043A JP 2000272043 A JP2000272043 A JP 2000272043A JP 3739643 B2 JP3739643 B2 JP 3739643B2
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transmission
unit
switching
channel
optical wavelength
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JP2002084229A (en
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隆充 藤原
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Mitsubishi Electric Corp
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Mitsubishi Electric Corp
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  • Use Of Switch Circuits For Exchanges And Methods Of Control Of Multiplex Exchanges (AREA)

Description

【０００１】
【発明の属する技術分野】
この発明は、光波長多重伝送方法および装置に関し、特に、１つの光伝送路で複数波長を伝送し、そのうちの１又は複数波長を予備チャネルとして使用する光波長多重伝送方法および装置に関する。
【０００２】
【従来の技術】
図９は、従来の光波長多重伝送装置を示す構成図である。同図において、１は送信部、２は光ファイバの光伝送路、３は受信部、４は送信部１に設けられた予備チャネル切替部である。
【０００３】
次に動作について説明する。送信部１より複数の波長λ１〜λｎが１本の光ファイバの光伝送路２を介して受信部３に光波長多重伝送で伝送される。光伝送路２の光ファイバが例えば８波長を伝送可能な性能であるとすると、７波長は主チャネルとして通信運用に使用し、他の１つの波長は予備チャネルとして使用する。そして、送信部１で主チャネルの波長のいずれかに異常が生じた場合に予備チャネル切替部４で予備チャネルに切替えて使用するものである。この予備切替システムは、予備切替していない場合（主チャネルが正常動作）も、予備チャネル切替部４で予備切替した場合も常に主チャネルおよび予備チャネルともに使用して伝送を行っている。そして、予備チャネルに切替えた後も異常が発生した波長は切り離すことなくそのまま送信をを継続している。
【０００４】
【発明が解決しようとする課題】
上記のように、従来の光波長多重伝送方式の予備切替システムでは、常に主チャネルおよび予備チャネルともに使用して伝送を行っているので、伝送量が予備波長の分だけ犠牲になる。すなわち、８チャネルを送信可能であるにもかかわらず、予備で常に１チャネルを使用しているので主チャネルには７チャネルしか利用できないことになり、主チャネルの伝送量が１チャネル分犠牲になるという問題がある。さらにまた、予備チャネルに切替えた後も異常が発生したチャネルは切り離すことなくそのまま送信をを継続しているので、異常発生の波長の信号が受信部３で受信され、雑音等の要因になるという問題もあった。
【０００５】
この発明は上記のような課題を解決するためになされたもので、主チャネルの伝送量を犠牲にせず、予備切替を行うことのできる光波長多重伝送方法および装置を得ることを目的とする。
また、この発明は、異常が発生したチャネルを切り離すことにより雑音等が生じないようにした光波長多重伝送方法および装置を得ることを目的とする。
【０００６】
【課題を解決するための手段】
この発明に係る光波長多重伝送方法は、平常時は主チャネルのみで送信を行い、主チャネルのいずれかに故障が発生した場合は故障チャネルを予備チャネルに切替えると共に、故障チャネルの送信ラインは遮断するものである。
【０００７】
この発明に係る光波長多重伝送装置は、送信部は、複数の送信ラインに直列接続された伝送装置および切替スイッチと、各送信ラインに接続された予備チャネル切替部とからなり、予備チャネル切替部は、送信ラインに並列に接続された送信信号選択部と、伝送装置の故障を監視する障害監視部と、障害監視部からの指令に基づいて切替スイッチをオフにすると同時に予備チャネル切替スイッチをオンにする切替制御部とを備えているものである。
【０００８】
この発明に係る光波長多重伝送装置において、受信部は、複数の受信ラインに直列接続された受信装置と、各受信ラインに接続された予備チャネル切替部とからなり、予備チャネル切替部は、受信ラインに直列に接続された切替スイッチと、予備受信ラインに接続された受信装置と、各受信装置の故障を監視する障害監視部と、障害監視部からの指令に基づいて切替スイッチを受信ラインから予備受信ラインとに切替える切替制御部とを備えているものである。
【０００９】
この発明に係る光波長多重伝送装置は、伝送装置の送信ラインに切替スイッチが直列接続され、受信装置の受信ラインに自己監視信号選択スイッチが接続され、伝送装置の出力を自己監視信号選択スイッチを介して受信装置にループバックするように切替え、対向装置に信号を送信していないとき、受信装置により伝送装置の故障を自己監視するようにしたものである。
【００１０】
この発明に係る光波長多重伝送装置は、対向装置が信号を送信していないとき自己監視信号を利用して、受信部の障害監視を行うものである。
【００１１】
【発明の実施の形態】
以下、図面を参照してこの発明の実施の形態を詳細に説明する。なお、以下の実施の形態では波長がλ１〜λｎ，λｎ１のＮ＋１波長のうちのＮ（任意の数）の多重信号である場合について説明する。
実施の形態１．
図１は実施の形態１による光波長多重伝送装置を示す概略構成図であって、１は送信部、２は光ファイバの光伝送路、３は受信部、４は送信部１に設けられた予備チャネル切替部、ＳＷ１〜ＳＷｎは送信部１の送信ラインＴ１〜Ｔｎに接続された切替スイッチである。予備チャネル切替部４には、送信部１の送信ラインＴ１〜Ｔｎに接続された送信信号選択部５およびこの送信信号選択部５に接続された信号切替スイッチＳＷｎ１を備えている。
【００１２】
次に動作について説明する。
送信ラインＴ１〜ＴｎにＮ個の信号が入力され、切替スイッチＳＷ１〜ＳＷｎを介して光伝送路２に送信され、光伝送路２から波長多重信号として受信部３に伝送される。平常時は送信波長λ１〜λｎのＮチャネルで送信している。このＮチャネルが光波長多重伝送の運用のための信号を伝送する主チャネルである。
【００１３】
図１に示すように、Ｎチャネルで波長λ１〜λｎの波長多重信号が送信されているときは、切替スイッチＳＷ１〜ＳＷｎはオンであり、予備チャネル切替部４の切替スイッチＳＷｎ１はオフとなっている。このため、予備チャネル切替部４からは信号が送出されない。前記送信信号選択部５で各送信ラインＴ１〜Ｔｎを監視しており、いずれかの送信ライン（例えば送信ラインＴｎ）の伝送装置（図示せず）に異常が発生すると、図２に示すように、送信信号選択部５からの指令でその送信ラインＴｎの切替スイッチＳＷｎをオフにすると共に、予備用の切替スイッチＳＷｎ１をオンにする。これにより、異常発生のチャネルの送信が停止し、予備チャネルで送信される。
【００１４】
以上のように、この実施の形態１によれば、正常に波長多重信号が送信されているときは、切替スイッチＳＷ１〜ＳＷｎはオン、予備チャネル切替部４の切替スイッチＳＷｎ１はオフとなっているので、予備チャネルは使用されず、いずれかの伝送装置に異常が発生すると、その送信ラインの切替スイッチをオフにすると共に、予備チャネルをオンにし、故障発生のチャネルの送信が停止し、予備チャネルで送信される。したがって、主チャネルの伝送量を犠牲にせず、予備切替を行うことができると共に、故障が発生したチャネルを切り離すことにより雑音等が生じないようにすることができる。
【００１５】
実施の形態２．
図３は、この発明の実施の形態２による光波長多重伝送装置の送信部１を示す構成図である。同図において、ＳＡ１〜ＳＡｎは切替スイッチＳＷ１〜ＳＷｎの前段において送信ラインＴ１〜Ｔｎに接続された伝送装置である。前記予備チャネル切替部４には、前記送信信号選択部５に接続された伝送装置ＳＡｎ１と、伝送装置ＳＡｎ１に接続された切替スイッチＳＷｎ１と、伝送装置ＳＡ１〜ＳＡｎ、ＳＡｎ１の障害を監視する障害監視部６と、この障害監視部６からの信号に基づいて前記切替スイッチＳＷ１〜ＳＷｎ１を切替える切替制御部７とを備えている。
【００１６】
図４は、この発明の実施の形態２による光波長多重伝送装置の受信部３を示す構成図である。同図において、Ｌ１〜Ｌｎは送信部１の主チャネルからの受信波長λ１〜λｎを受信する受信ライン、ＲＡ１〜ＲＡｎは受信ラインＬ１〜Ｌｎに接続された受信装置、ＲＷ１〜ＲＷｎは受信装置ＲＡ１〜ＲＡｎに接続された切替スイッチである。８は予備チャネル切替部であって、受信装置ＲＡ１〜ＲＡｎ、ＲＡｎ１の障害を監視する障害監視部１０と、この障害監視部１０からの信号の基づいて切替スイッチＲＷ１〜ＲＷｎを切替える切替制御部１１とを備えている。予備チャネルの受信ラインであるＬｎ１は、受信装置ＲＡｎ１を介して前記切替スイッチＲＷ１〜ＲＷｎの切替接点１４に接続されている。
【００１７】
次に、上記送信部１および受信部３の動作を、伝送装置ＳＡｎで故障が発生した場合を想定して具体的に説明する。
伝送装置ＳＡｎで故障が発生すると、障害監視部６がこれを検出し、切替制御部７に障害発生を通知し、切替制御部７で切替開始を判断して伝送装置ＳＡ１〜ＳＡｎに対して対向装置である受信部３への切替要求通知を指令する。これにより、伝送装置ＳＡ１〜ＳＡｎで受信部３に切替要求を主信号を使用して送信する。受信部３では切替要求を受信し、受信装置ＲＡ１〜ＲＡｎから切替制御部１１に切替要求を通知する。
【００１８】
切替制御部１１から送信部１の送信信号選択部５に切替信号が送信され、送信信号選択部５により切替スイッチＳＷ１〜ＳＷｎ１のうちＳＷｎを鎖線のようにオフ、ＳＷｎ1 を鎖線のようにオンに切替制御する。これにより、送信信号選択部５で送信ラインＴｎを選択し、予備チャネル切替部４の伝送装置ＳＡｎ１から出力することができる。切替スイッチＳＷｎとＳＷｎ１の切替が終了すると切替制御部７から伝送装置ＳＡ１〜ＳＡｎに切替完了通知を送信する。
次に、送信部１の伝送装置ＳＡ１〜ＳＡｎからの切替完了通知を受信部３の受信装置ＲＡ１〜ＲＡｎで受信し、受信装置ＲＡ１〜ＲＡｎからの信号で切替制御部１１が切替スイッチＲＷ１〜ＲＷｎのうちＲＷｎを受信ラインＬｎ１の接点１４側（鎖線の位置）に切替える。これにより、送信部１では、主チャネルの送信波長λｎがオフ、予備チャネルの波長λｎがオンとなり、受信部３では主チャネルの受信ラインＬｎがオフ、予備チャネルの受信ラインＬｎ１がオンとなり、故障の伝送装置ＳＡｎからの信号が送受信されることがなくなる。
【００１９】
以上のように、この実施の形態２によれば、正常に波長多重信号が送信されているときは、切替スイッチＳＷ１〜ＳＷｎはオン、予備チャネル切替部４の切替スイッチＳＷｎ１はオフとなっているので、予備チャネルは使用されず、いずれかの伝送装置ＳＡ１〜ＳＡｎに異常が発生すると、その送信波長λ１〜λｎの切替スイッチをオフにすると共に、予備チャネルをオンにし、故障発生のチャネルの送信が停止し、予備チャネルで送信される。したがって、主チャネルの伝送量を犠牲にせず、予備切替を行うことができると共に、故障が発生したチャネルを切り離すことにより雑音等が生じないようにすることができる。
【００２０】
実施の形態３．
図５はこの発明の実施の形態３による光波長多重伝送装置を示す構成図であって、前記実施の形態２（図３）の構成から切替スイッチＳＷ１〜ＳＷｎを除き、前記送信信号選択部５からの制御信号で伝送装置ＳＡ１〜ＳＡｎ１の電源を断にするようにしたものである。例えば、図６に示すように、伝送装置ＳＡｎで故障が発生したとする送信信号選択部５の制御信号で伝送装置ＳＡｎの電源を断としてその伝送装置ＳＡｎからの出力を停止すると共に、送信信号選択部５で送信ラインＴｎを選択し、予備チャネル切替部４の伝送装置ＳＡｎ１から出力する。
【００２１】
以上のように、この実施の形態３によれば、いずれかの伝送装置ＳＡ１〜ＳＡｎに異常が発生すると、その送信波長λ１〜λｎの伝送装置ＳＡ１〜ＳＡｎの電源を断とするので、主チャネルの伝送量を犠牲にせず、予備切替を行うことができると共に、故障が発生したチャネルを電源断で切り離すことにより雑音等が生じないようにすることができる。
【００２２】
実施の形態４．
図７は、この発明の実施の形態４による光波長多重伝送装置の送受信部を示す構成図である。図７において、１２は送受信部、１３はこの送受信部１２に設けられた自己監視信号選択スイッチであって、送信ラインＴの伝送装置ＳＡと切替スイッチＳＷとの間に接続されている。ＲＡは自己監視信号選択スイッチ１３に接続された受信装置である。
【００２３】
次に動作について説明する。
図７に示すように、切替スイッチＳＷをオフにし、自己監視信号選択スイッチ１３を送信ラインＴ側に切替えると、波長λの送信信号が自己監視信号選択スイッチ１３から受信装置ＲＡに折り返されると共に、受信ラインＬからの信号は受信されないようになっている。この折り返し信号を使用し、対向より信号が送信されていないときも受信装置ＲＡにより、伝送装置ＳＡの故障の有無を自己監視できる。
【００２４】
また、図８に示すように、切替スイッチＳＷをオンにし、自己監視信号選択スイッチ１３を受信ラインＬ側に切替えると、受信信号が自己監視信号選択スイッチ１３から受信装置ＲＡで受信される。つまり、自己監視信号選択スイッチ１３を利用して受信を行うと共に、送信信号の自己監視も可能にしたものである。
【００２５】
以上のように、この発明の実施の形態４によれば、送受信部１２の受信装置ＲＡに送信信号をループバックして自己監視するので、対向装置に信号を送信していない場合も別途に故障監視装置を設けることなく、伝送装置ＳＡの故障の有無を監視できる。また、対向により信号が送信されていないときも受信装置ＲＡに信号を入力し、受信装置ＲＡを信号が通った状態で、監視することができる。
【００２６】
以上、この発明の実施の形態を図面により詳述してきたが、具体的な構成はこの実施の形態に限られるものではなく、この発明の要旨を逸脱しない範囲の設計の変更等があってもこの発明に含まれる。
例えば、図３および図４に示す実施の形態２において、予備チャネルを２チャネル以上とし、２チャネル以上の故障に対応する構成も可能である。すなわち、送信部１において、送信信号選択部５、伝送装置ＳＡｎ１、切替スイッチＳＷｎ１の回路を２本以上設け、受信部３において、受信ラインＬｎ１および受信装置ＲＡｎ１の回路を２本以上設けた構成とすることができる。
【００２７】
【発明の効果】
以上のように、この発明によれば、正常に波長多重信号が送信されているときは、主チャネルの切替スイッチはオン、予備チャネルの切替スイッチはオフとなっているので、平常時は予備チャネルは使用されず、したがって、主チャネルの伝送量を犠牲にせず、予備切替を行うことができる。また、いずれかの伝送装置に異常が発生すると、そのチャネルの切替スイッチをオフにすると共に予備チャネルで送信されるようにしたので、故障が発生したチャネルを切り離すことにより雑音等が生じないようにすることができる効果がある。
【００２８】
この発明によれば、いずれかの伝送装置に異常が発生すると、その伝送装置の電源を断とするので、切替スイッチを設けることなく主チャネルの伝送量を犠牲にせず、予備切替を行うことができると共に、故障が発生したチャネルを電源断で切り離すことができる効果がある。
また、送受信部の受信装置に送信信号をループバックして自己監視するので、別途に故障監視装置を設ける必要がなく、伝送装置の故障の有無を監視できる効果がある。
【図面の簡単な説明】
【図１】 この発明の実施の形態１による光波長多重伝送装置を示す構成図である。
【図２】 実施の形態１による切替え動作を示す構成図である。
【図３】 この発明の実施の形態２による光波長多重伝送装置の送信部を示す構成図である。
【図４】 この発明の実施の形態２による光波長多重伝送装置の受信部を示す構成図である。
【図５】 この発明の実施の形態３による光波長多重伝送装置を示す構成図である。
【図６】 実施の形態３による切替え動作を示す構成図である。
【図７】 この発明の実施の形態４による光波長多重伝送装置の送受信部を示す構成図である。
【図８】 実施の形態４の切替え動作を示す構成図である。
【図９】 従来の光波長多重伝送装置を示す構成図である。
【符号の説明】
１ 送信部、２ 光伝送路、３ 受信部、４ 予備チャネル切替部、５ 送信信号選択部、６ 障害監視部、７ 切替制御部、８ 予備チャネル切替部、１０障害監視部、１１ 切替制御部、１２ 送受信部、１３ 自己監視信号選択スイッチ、１４ 切替接点、Ｌ１〜Ｌｎ、Ｌｎ１ 受信ライン、ＲＡ，ＲＡ１〜ＲＡｎ、ＲＡｎ１ 受信装置、ＲＷ１〜ＲＷｎ 切替スイッチ、ＳＡ，ＳＡ１〜ＳＡｎ、ＳＡｎ１ 伝送装置、ＳＷ，ＳＷ１〜ＳＷｎ，ＳＷｎ１ 切替スイッチ、Ｔ，Ｔ１〜Ｔｎ 送信ライン。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an optical wavelength division multiplex transmission method and apparatus, and more particularly to an optical wavelength division multiplex transmission method and apparatus for transmitting a plurality of wavelengths on one optical transmission line and using one or a plurality of wavelengths as a backup channel.
[0002]
[Prior art]
FIG. 9 is a block diagram showing a conventional optical wavelength division multiplex transmission apparatus. In the figure, 1 is a transmission unit, 2 is an optical transmission line of an optical fiber, 3 is a reception unit, and 4 is a backup channel switching unit provided in the transmission unit 1.
[0003]
Next, the operation will be described. A plurality of wavelengths λ1 to λn are transmitted from the transmitter 1 to the receiver 3 via the optical transmission line 2 of one optical fiber by optical wavelength multiplexing transmission. If the optical fiber of the optical transmission line 2 has a performance capable of transmitting, for example, 8 wavelengths, the 7 wavelengths are used as a main channel for communication operation, and the other one wavelength is used as a backup channel. Then, when an abnormality occurs in any of the wavelengths of the main channel in the transmission unit 1, the backup channel switching unit 4 switches to the backup channel and uses it. In this standby switching system, transmission is always performed using both the main channel and the standby channel, both when the standby switching is not performed (the main channel is operating normally) and when the standby channel switching unit 4 performs the standby switching. Then, even after switching to the protection channel, the wavelength in which an abnormality has occurred is continuously transmitted without being disconnected.
[0004]
[Problems to be solved by the invention]
As described above, in the standby switching system of the conventional optical wavelength division multiplex transmission system, transmission is always performed using both the main channel and the standby channel, so that the transmission amount is sacrificed by the backup wavelength. That is, even though 8 channels can be transmitted, since only 1 channel is always used for backup, only 7 channels can be used for the main channel, and the transmission amount of the main channel is sacrificed by 1 channel. There is a problem. Furthermore, even after switching to the protection channel, the channel in which an abnormality has occurred is continuously transmitted without being disconnected, so that the signal having the wavelength at which the abnormality has occurred is received by the receiving unit 3 and causes noise and the like. There was also a problem.
[0005]
The present invention has been made to solve the above-described problems, and an object of the present invention is to provide an optical wavelength division multiplex transmission method and apparatus capable of performing preliminary switching without sacrificing the transmission amount of the main channel.
It is another object of the present invention to provide an optical wavelength division multiplex transmission method and apparatus in which noise or the like is not generated by disconnecting a channel in which an abnormality has occurred.
[0006]
[Means for Solving the Problems]
In the optical wavelength division multiplexing transmission method according to the present invention, transmission is normally performed only on the main channel, and when a failure occurs in any of the main channels, the failed channel is switched to the spare channel and the transmission line of the failed channel is cut off. To do.
[0007]
In the optical wavelength division multiplexing transmission apparatus according to the present invention, the transmission unit includes a transmission device and a changeover switch connected in series to a plurality of transmission lines, and a backup channel switching unit connected to each transmission line. The transmission signal selection unit connected in parallel to the transmission line, the failure monitoring unit for monitoring the failure of the transmission device, and the switch on the standby channel switching switch at the same time as the switch is turned off based on a command from the failure monitoring unit And a switching control unit.
[0008]
In the optical wavelength division multiplexing transmission apparatus according to the present invention, the receiving unit includes a receiving device connected in series to a plurality of receiving lines and a backup channel switching unit connected to each receiving line. A changeover switch connected in series to the line, a receiving device connected to the standby receiving line, a failure monitoring unit that monitors a failure of each receiving device, and a changeover switch from the receiving line based on a command from the failure monitoring unit And a switching control unit for switching to the spare reception line.
[0009]
In the optical wavelength division multiplexing transmission apparatus according to the present invention, a changeover switch is connected in series to the transmission line of the transmission apparatus, a self-monitoring signal selection switch is connected to the reception line of the reception apparatus, and the output of the transmission apparatus is connected to the self-monitoring signal selection switch. And switching to loop back to the receiving device, and when the signal is not transmitted to the opposite device, the receiving device self-monitors the failure of the transmission device.
[0010]
The optical wavelength division multiplexing transmission apparatus according to the present invention performs failure monitoring of the receiving unit using a self-monitoring signal when the opposite apparatus is not transmitting a signal.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the following embodiment, a case will be described in which there are N (arbitrary number) of multiplexed signals among N + 1 wavelengths of wavelengths λ1 to λn and λn1.
Embodiment 1 FIG.
FIG. 1 is a schematic configuration diagram illustrating an optical wavelength division multiplex transmission apparatus according to Embodiment 1, in which 1 is a transmission unit, 2 is an optical fiber optical transmission line, 3 is a reception unit, and 4 is provided in the transmission unit 1. The spare channel switching units SW1 to SWn are changeover switches connected to the transmission lines T1 to Tn of the transmission unit 1. The backup channel switching unit 4 includes a transmission signal selection unit 5 connected to the transmission lines T1 to Tn of the transmission unit 1 and a signal switch SWn1 connected to the transmission signal selection unit 5.
[0012]
Next, the operation will be described.
N signals are input to the transmission lines T1 to Tn, transmitted to the optical transmission line 2 via the changeover switches SW1 to SWn, and transmitted from the optical transmission line 2 to the receiving unit 3 as a wavelength multiplexed signal. In normal times, transmission is performed using N channels of transmission wavelengths λ1 to λn. This N channel is a main channel for transmitting a signal for the operation of optical wavelength division multiplexing transmission.
[0013]
As shown in FIG. 1, when wavelength multiplexed signals of wavelengths λ1 to λn are transmitted on the N channel, the changeover switches SW1 to SWn are on, and the changeover switch SWn1 of the standby channel switching unit 4 is off. Yes. For this reason, no signal is transmitted from the protection channel switching unit 4. Each of the transmission lines T1 to Tn is monitored by the transmission signal selector 5, and if an abnormality occurs in a transmission device (not shown) of any transmission line (for example, transmission line Tn), as shown in FIG. In response to a command from the transmission signal selector 5, the switch SWn for the transmission line Tn is turned off and the spare switch SWn1 is turned on. As a result, transmission of the channel in which an abnormality has occurred stops and transmission is performed on the backup channel.
[0014]
As described above, according to the first embodiment, when the wavelength multiplexed signal is normally transmitted, the change-over switches SW1 to SWn are on, and the change-over switch SWn1 of the standby channel switching unit 4 is off. Therefore, the spare channel is not used, and if an error occurs in any of the transmission devices, the transmission line change-over switch is turned off, the spare channel is turned on, and transmission of the faulty channel is stopped. Sent by. Therefore, it is possible to perform the preliminary switching without sacrificing the transmission amount of the main channel, and it is possible to prevent noise or the like by separating the channel in which the failure has occurred.
[0015]
Embodiment 2. FIG.
FIG. 3 is a block diagram showing a transmitter 1 of an optical wavelength division multiplex apparatus according to Embodiment 2 of the present invention. In the figure, SA1 to SAn are transmission devices connected to transmission lines T1 to Tn in the previous stage of the changeover switches SW1 to SWn. The backup channel switching unit 4 includes a transmission device SAn1 connected to the transmission signal selection unit 5, a changeover switch SWn1 connected to the transmission device SAn1, and a failure monitor that monitors failures of the transmission devices SA1 to SAn, SAn1. Unit 6 and a switching control unit 7 for switching the change-over switches SW1 to SWn1 based on a signal from the failure monitoring unit 6.
[0016]
FIG. 4 is a block diagram showing the receiving unit 3 of the optical wavelength division multiplexing apparatus according to Embodiment 2 of the present invention. In the figure, L1 to Ln are reception lines for receiving the reception wavelengths λ1 to λn from the main channel of the transmission unit 1, RA1 to RAn are reception devices connected to the reception lines L1 to Ln, and RW1 to RWn are reception devices RA1. A changeover switch connected to RAn. 8 is a protection channel switching unit, which includes a failure monitoring unit 10 that monitors failures of the receiving devices RA1 to RAn and RAn1, and a switching control unit 11 that switches the changeover switches RW1 to RWn based on signals from the failure monitoring unit 10. And. Ln1 which is a reception line of the backup channel is connected to the switching contact 14 of the changeover switches RW1 to RWn via the receiving device RAn1.
[0017]
Next, the operations of the transmission unit 1 and the reception unit 3 will be specifically described on the assumption that a failure has occurred in the transmission device SAn.
When a failure occurs in the transmission device SAn, the failure monitoring unit 6 detects this, notifies the switching control unit 7 of the occurrence of the failure, determines the start of switching by the switching control unit 7, and faces the transmission devices SA1 to SAn. A switch request notification is instructed to the receiving unit 3 that is a device. As a result, the transmission device SA1 to SAn transmits a switching request to the receiving unit 3 using the main signal. The receiving unit 3 receives the switching request and notifies the switching control unit 11 of the switching request from the receiving devices RA1 to RAn.
[0018]
A switching signal is transmitted from the switching control unit 11 to the transmission signal selection unit 5 of the transmission unit 1, and the transmission signal selection unit 5 turns off SWn of the switches SW1 to SWn1 as a chain line and turns on SWn1 as a chain line. Switch control. As a result, the transmission signal selection unit 5 can select the transmission line Tn and output it from the transmission device SAn1 of the backup channel switching unit 4. When the switching between the switches SWn and SWn1 is completed, a switching completion notification is transmitted from the switching control unit 7 to the transmission devices SA1 to SAn.
Next, switching completion notifications from the transmission devices SA1 to SAn of the transmission unit 1 are received by the reception devices RA1 to RAn of the reception unit 3, and the switching control unit 11 receives the signals from the reception devices RA1 to RAn and the switching control unit 11 performs the switching switches RW1 to RWn. RWn is switched to the contact 14 side (chain line position) of the reception line Ln1. Thus, in the transmission unit 1, the transmission wavelength λn of the main channel is turned off and the wavelength λn of the backup channel is turned on, and in the reception unit 3, the reception line Ln of the main channel is turned off and the reception line Ln1 of the backup channel is turned on. The signal from the transmission device SAn is not transmitted or received.
[0019]
As described above, according to the second embodiment, when the wavelength multiplexed signal is normally transmitted, the change-over switches SW1 to SWn are on, and the change-over switch SWn1 of the standby channel switching unit 4 is off. Therefore, the spare channel is not used, and if any one of the transmission devices SA1 to SAn has an abnormality, the switch for the transmission wavelengths λ1 to λn is turned off and the spare channel is turned on to transmit the faulty channel. Stops and is transmitted on the protection channel. Therefore, it is possible to perform the preliminary switching without sacrificing the transmission amount of the main channel, and it is possible to prevent noise or the like by separating the channel in which the failure has occurred.
[0020]
Embodiment 3 FIG.
FIG. 5 is a block diagram showing an optical wavelength division multiplex apparatus according to Embodiment 3 of the present invention, except that the selector switches SW1 to SWn are excluded from the configuration of Embodiment 2 (FIG. 3), and the transmission signal selector 5 The power of the transmission devices SA1 to SAn1 is turned off by a control signal from. For example, as shown in FIG. 6, the transmission signal SAn is turned off by a control signal from the transmission signal selector 5 indicating that a failure has occurred in the transmission device SAn, the output from the transmission device SAn is stopped, and the transmission signal The selection unit 5 selects the transmission line Tn and outputs it from the transmission device SAn1 of the backup channel switching unit 4.
[0021]
As described above, according to the third embodiment, when an abnormality occurs in any of the transmission devices SA1 to SAn, the power of the transmission devices SA1 to SAn having the transmission wavelengths λ1 to λn is turned off. Thus, the pre-switching can be performed without sacrificing the transmission amount of the signal, and noise or the like can be prevented from being generated by disconnecting the channel in which the failure has occurred by turning off the power.
[0022]
Embodiment 4 FIG.
FIG. 7 is a block diagram showing a transmission / reception unit of an optical wavelength division multiplex apparatus according to Embodiment 4 of the present invention. In FIG. 7, reference numeral 12 denotes a transmission / reception unit, and reference numeral 13 denotes a self-monitoring signal selection switch provided in the transmission / reception unit 12, which is connected between the transmission device SA and the changeover switch SW on the transmission line T. RA is a receiving device connected to the self-monitoring signal selection switch 13.
[0023]
Next, the operation will be described.
As shown in FIG. 7, when the changeover switch SW is turned off and the self-monitoring signal selection switch 13 is switched to the transmission line T side, the transmission signal of wavelength λ is turned from the self-monitoring signal selection switch 13 to the receiving device RA, A signal from the reception line L is not received. Using this return signal, even when no signal is transmitted from the opposite side, the receiving device RA can self-monitor whether or not the transmission device SA has failed.
[0024]
As shown in FIG. 8, when the changeover switch SW is turned on and the self-monitoring signal selection switch 13 is switched to the reception line L side, the reception signal is received from the self-monitoring signal selection switch 13 by the receiving device RA. That is, the self-monitoring signal selection switch 13 is used for reception and the transmission signal can be self-monitored.
[0025]
As described above, according to the fourth embodiment of the present invention, the transmission signal is looped back to the receiving device RA of the transmission / reception unit 12 and self-monitoring is performed. It is possible to monitor whether or not the transmission device SA has failed without providing a monitoring device. Further, even when no signal is transmitted due to the opposite, a signal can be input to the receiving device RA and monitoring can be performed with the signal passing through the receiving device RA.
[0026]
The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to the embodiment, and even if there is a design change or the like without departing from the gist of the present invention. It is included in this invention.
For example, in the second embodiment shown in FIG. 3 and FIG. 4, it is possible to adopt a configuration in which the number of spare channels is two or more and the failure corresponds to two or more channels. That is, the transmission unit 1 includes two or more circuits of the transmission signal selection unit 5, the transmission device SAn1, and the changeover switch SWn1, and the reception unit 3 includes two or more circuits of the reception line Ln1 and the reception device RAn1. can do.
[0027]
【The invention's effect】
As described above, according to the present invention, when a wavelength division multiplexed signal is normally transmitted, the main channel selector switch is on and the standby channel selector switch is off. Is not used, and therefore, preliminary switching can be performed without sacrificing the transmission amount of the main channel. Also, if an error occurs in any of the transmission devices, the channel switch is turned off and transmitted on the spare channel, so that noise etc. do not occur by disconnecting the failed channel. There is an effect that can be done.
[0028]
According to the present invention, when an abnormality occurs in any of the transmission apparatuses, the power supply of the transmission apparatus is turned off, so that it is possible to perform preliminary switching without sacrificing the transmission amount of the main channel without providing a changeover switch. In addition to this, there is an effect that the channel in which the failure has occurred can be disconnected by turning off the power.
Further, since the transmission signal is looped back to the receiving device of the transmission / reception unit and self-monitoring is performed, there is no need to separately provide a failure monitoring device, and there is an effect that it is possible to monitor the presence or absence of a failure in the transmission device.
[Brief description of the drawings]
FIG. 1 is a block diagram showing an optical wavelength division multiplex apparatus according to Embodiment 1 of the present invention.
FIG. 2 is a configuration diagram showing a switching operation according to the first embodiment.
FIG. 3 is a block diagram showing a transmitter of an optical wavelength division multiplex apparatus according to Embodiment 2 of the present invention.
FIG. 4 is a block diagram showing a receiving unit of an optical wavelength division multiplex apparatus according to Embodiment 2 of the present invention.
FIG. 5 is a block diagram showing an optical wavelength division multiplex apparatus according to Embodiment 3 of the present invention.
6 is a configuration diagram showing a switching operation according to a third embodiment. FIG.
FIG. 7 is a block diagram showing a transmission / reception unit of an optical wavelength division multiplex apparatus according to Embodiment 4 of the present invention.
FIG. 8 is a configuration diagram illustrating a switching operation according to the fourth embodiment.
FIG. 9 is a block diagram showing a conventional optical wavelength division multiplexing transmission apparatus.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Transmission part, 2 Optical transmission line, 3 Reception part, 4 Backup channel switching part, 5 Transmission signal selection part, 6 Fault monitoring part, 7 Switching control part, 8 Backup channel switching part, 10 Fault monitoring part, 11 Switching control part , 12 transmitting / receiving unit, 13 self-monitoring signal selection switch, 14 switching contact, L1 to Ln, Ln1 receiving line, RA, RA1 to RAn, RAn1 receiving device, RW1 to RWn switching switch, SA, SA1 to SAn, SAn1 transmitting device, SW, SW1 to SWn, SWn1 changeover switch, T, T1 to Tn transmission line.

Claims (1)

送信部と、光ファイバの伝送路と、受信部とを備え、前記送信部からの光波長多重信号を前記伝送路を介して前記受信部で受信する光波長多重伝送装置において、In the optical wavelength multiplexing transmission apparatus comprising a transmission unit, an optical fiber transmission line, and a reception unit, and receiving the optical wavelength multiplexed signal from the transmission unit via the transmission line at the reception unit,
前記送信部は、The transmitter is
複数の送信ラインに直列接続された伝送装置および切替スイッチと、A transmission device and a changeover switch connected in series to a plurality of transmission lines;
前記各送信ラインに接続された予備チャネル切替部とからなり、A backup channel switching unit connected to each transmission line,
該予備チャネル切替部は、The spare channel switching unit
前記送信ラインに並列に接続された送信信号選択部と、A transmission signal selector connected in parallel to the transmission line;
前記伝送装置の故障を監視する障害監視部と、A failure monitoring unit for monitoring a failure of the transmission device;
該障害監視部からの指令に基づいて前記切替スイッチをオフにすると同時に予備チャネル切替スイッチをオンにする切替制御部とを備えていることを特徴とする光波長多重伝送装置。An optical wavelength division multiplex transmission apparatus comprising: a switching control unit that turns off the standby switch at the same time as the switching switch is turned off based on a command from the failure monitoring unit.
JP2000272043A 2000-09-07 2000-09-07 Optical wavelength division multiplexing transmission method and apparatus Expired - Fee Related JP3739643B2 (en)

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