JPH10303814A - Optical path network and optical path network changeover device - Google Patents
Optical path network and optical path network changeover deviceInfo
- Publication number
- JPH10303814A JPH10303814A JP9114113A JP11411397A JPH10303814A JP H10303814 A JPH10303814 A JP H10303814A JP 9114113 A JP9114113 A JP 9114113A JP 11411397 A JP11411397 A JP 11411397A JP H10303814 A JPH10303814 A JP H10303814A
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- optical
- signal
- level
- detection
- path network
- Prior art date
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Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は光パス網及び光パス
網切り換え装置に関し、特に共に光信号が伝送する現用
伝送路と予備伝送路とを有する光パス網及び光パス網切
り換え装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical path network and an optical path network switching apparatus, and more particularly to an optical path network and an optical path network switching apparatus having an active transmission line and a protection transmission line for transmitting optical signals.
【０００２】[0002]
【従来の技術】現在、その低損失性、広帯域性等の利点
を有する光ファイバを用いた光通信方式が様々な分野に
おいて幅広く用いられている。それに伴って、光通信を
確実かつ正確に行うための光パス網の保守、管理及び障
害回避方法が各種提案されている。2. Description of the Related Art At present, an optical communication system using an optical fiber having advantages such as low loss property and wide band property is widely used in various fields. Accordingly, various methods for maintaining, managing, and avoiding a failure in an optical path network for reliably and accurately performing optical communication have been proposed.
【０００３】中でも、光通信を確実かつ正確に行うため
の障害回避方法として、１つの伝送路を用いるのではな
く、現用伝送路と予備用伝送路との２つの伝送路、若し
くはこれらの伝送路に対応し、光パス網に接続された現
用装置及び予備装置を用いることにより、効率よく障害
を回避する方法が提案されている。[0003] Above all, as a method of avoiding a failure for performing optical communication reliably and accurately, instead of using one transmission line, two transmission lines, an active transmission line and a protection transmission line, or these transmission lines are used. In response to this problem, there has been proposed a method of efficiently avoiding a failure by using an active device and a backup device connected to an optical path network.
【０００４】この現用伝送路と予備用伝送路との２つの
伝送路、若しくはこれらの伝送路に対応し、光パス網に
接続された現用装置及び予備装置を用いた障害回避方法
は、現用伝送路若しくは現用装置における光信号と、予
備用伝送路若しくは予備装置における光信号とのそれぞ
れのレベルを検出し、この検出結果に基づき、出力する
光信号として、現用伝送路若しくは現用装置における光
信号と、予備用伝送路若しくは予備装置における光信号
とのいずれかに切り換えることにより、障害を回避する
方法である。[0004] A fault avoiding method using two working lines, a working transmission line and a protection transmission line, or a working device corresponding to these working lines and a protection device connected to an optical path network is described in the working transmission line. The optical signal in the path or working device and the level of the optical signal in the protection transmission line or protection device are detected, and based on this detection result, the optical signal to be output is output as the optical signal in the working transmission line or working device. This is a method of avoiding a failure by switching to either a protection transmission line or an optical signal in a protection device.
【０００５】例えば、特開平５−２１１４８１号公報に
おいては、入力側光信号を監視する場合の、装置のコス
トダウンを図ることが可能な、現用と予備用との２つの
光アンプ回路を有する「光中継器」が開示されている。For example, Japanese Patent Application Laid-Open No. Hei 5-21481 has two optical amplifier circuits, an active amplifier and a standby amplifier, which can reduce the cost of an apparatus when monitoring an input optical signal. An optical repeater is disclosed.
【０００６】この特開平５−２１１４８１号公報に開示
された「光中継器」は、光信号の光ファイバによる喪失
や分配による減衰を光信号のままで補償する光アンプ回
路が導入された光中継器であり、現用側光アンプ回路か
ら出力される光信号レベルを監視し、この監視した出力
光信号レベルが規定レベル以下である場合に、現用側光
アンプ回路が障害状態にあると判断して、現用側光アン
プ回路から予備側光アンプ回路へその接続を切り換える
ことにより、入力側の光信号の監視に用いるための比較
的高価な光、電気変換回路を不要にすることにより、光
中継器のコストダウンを図る技術である。The "optical repeater" disclosed in Japanese Patent Application Laid-Open No. Hei 5-21481 is an optical repeater in which an optical amplifier circuit for compensating for loss of an optical signal due to an optical fiber or attenuation due to distribution as an optical signal is introduced. And monitors the optical signal level output from the working optical amplifier circuit. If the monitored output optical signal level is lower than a specified level, it is determined that the working optical amplifier circuit is in a failure state. By switching the connection from the working-side optical amplifier circuit to the standby-side optical amplifier circuit, the need for a relatively expensive optical-to-electrical conversion circuit for use in monitoring the input-side optical signal is eliminated. This is a technology that reduces costs.
【０００７】上述のように、現用と予備用との２つの伝
送路、若しくはこれらに対応した装置を有する従来の光
パス網における光信号切り換え方式では、光信号が断線
した場合の障害を回避するために、その接続を現用と予
備用との２つの伝送路、若しくは装置間において切り換
えることによって、障害を回避している。As described above, in the optical signal switching method in the conventional optical path network having two transmission lines, the working line and the protection line, or a device corresponding to the two lines, it is possible to avoid a failure when an optical signal is broken. For this reason, the failure is avoided by switching the connection between two transmission paths, that is, a working path and a protection path, or between devices.
【０００８】[0008]
【発明が解決しようとする課題】しかしながら、光パス
網を伝送する光信号は、光素子若しくは光ファイバの経
年劣化等による光信号の劣化が原因となって、そのレベ
ルが低下する場合がある。この場合であっても、上述の
ような従来の光信号が断線した場合にのみ伝送路を切り
換えて障害を回避していたのでは、光信号のレベルが低
下した場合には伝送路の切り換えが行われないことにな
り、光パス網全体の信頼性が低下してしまうという問題
点を有している。However, the level of an optical signal transmitted through an optical path network may be reduced due to deterioration of the optical signal due to aging of an optical element or an optical fiber. Even in this case, the transmission path is switched only when the conventional optical signal is broken as described above to avoid the failure. Therefore, when the level of the optical signal is reduced, the transmission path is switched. This is not performed, and there is a problem that the reliability of the entire optical path network is reduced.
【０００９】また、上述の特開平５−２１１４８１号公
報に開示された「光中継器」は、光中継器自体の故障を
監視する発明であるため、光パス網を伝送する光信号の
レベル低下に伴う光パス網全体の信頼性が低下してしま
うことを防止することはできない。Further, the "optical repeater" disclosed in the above-mentioned Japanese Patent Application Laid-Open No. Hei 5-21481 is an invention for monitoring the failure of the optical repeater itself, and therefore the level of the optical signal transmitted through the optical path network is reduced. However, it is impossible to prevent the reliability of the entire optical path network from being reduced due to the above.
【００１０】本発明は、上記事情に鑑みなされたもので
あり、光パス網を伝送する光信号のレベル低下が発生し
た場合であっても、光パス網全体の信頼性が低下してし
まうことを防止することが可能な光パス網及び光パス網
切り換え装置を提供することを目的とする。The present invention has been made in view of the above circumstances, and the reliability of the entire optical path network is reduced even when the level of an optical signal transmitted through the optical path network is reduced. It is an object of the present invention to provide an optical path network and an optical path network switching device capable of preventing the problem.
【００１１】[0011]
【課題を解決するための手段】請求項１記載の発明は、
少なくとも光クロスコネクト装置と、光分岐挿入多重化
装置とを有する光パス網において、前記光クロスコネク
ト装置と光分岐挿入多重化装置とのそれぞれが、現用側
伝送路を伝送する第１の光入力信号の光レベルを検出
し、該検出結果を第１の検出信号として出力する第１の
光レベル検出部と、予備側伝送路を伝送する第２の光入
力信号の光レベルを検出し、該検出結果を第２の検出信
号として出力する第２の光レベル検出部と、前記第１の
検出信号及び第２の検出信号を入力し、これら第１の検
出信号及び第２の検出信号により表されるそれぞれの光
レベルが所定の閾値以下である場合は、切り換え要求信
号を出力する光レベル識別手段と、前記切り換え要求信
号に基づき、出力する光出力信号を、前記第１の光入力
信号若しくは第２の光入力信号のいずれか一方に切り換
える光信号切換手段とを有する光パス網切り換え装置を
有することを特徴とする。According to the first aspect of the present invention,
In an optical path network having at least an optical cross-connect device and an optical add-drop multiplexer, each of the optical cross-connect device and the optical add-drop multiplexer is a first optical input that transmits a working transmission line. A first optical level detector for detecting the optical level of the signal and outputting the detection result as a first detection signal; and detecting the optical level of a second optical input signal transmitted through the protection side transmission line. A second light level detection unit that outputs a detection result as a second detection signal, and inputs the first detection signal and the second detection signal, and displays the first detection signal and the second detection signal based on the first detection signal and the second detection signal. If each of the light levels is equal to or less than a predetermined threshold, the light level identification means for outputting a switching request signal, and an optical output signal to be output based on the switching request signal, the first optical input signal or Second And having a light path network switching device having a light signal switching means for switching to either one of the input signals.
【００１２】従って、この発明によれば、少なくとも光
クロスコネクト装置と、光分岐挿入多重化装置とを有す
る光パス網において、それぞれの装置毎に、光入力信号
のレベルを光レベル検出部が検出し、検出結果を光レベ
ル識別手段に送出し、光レベル識別手段では、受信した
光レベル検出結果とあらかじめ設定された閾値とを比較
し、第１の光レベル検出部が検出する光入力信号が現用
側伝送路を伝送した信号であるとした場合に、第１の光
レベル検出部において受信した光レベル検出結果が閾値
以下であった場合に、光信号切換手段に対して出力する
光入力信号として現用側伝送路を伝送した信号から、予
備側伝送路を伝送した信号に切り換える内容を表す切り
換え要求信号を送出すると共に、第２の光レベル検出部
が検出する光入力信号が予備側伝送路を伝送した信号で
あるとした場合に、第２の光レベル検出部において受信
した光レベル検出結果が閾値以下であった場合に、光信
号切換手段に対して出力する光入力信号として予備側伝
送路を伝送した信号から現用側伝送路を伝送した信号に
切り換える内容を表す切り換え要求信号を送出すること
により、光パス網を伝送する光信号のレベル低下が発生
した場合であっても、光パス網全体の信頼性の低下を防
止することができる。Therefore, according to the present invention, in the optical path network having at least the optical cross-connect device and the optical add / drop multiplexer, the optical level detection unit detects the level of the optical input signal for each device. Then, the detection result is sent to the optical level identification means, and the optical level identification means compares the received optical level detection result with a preset threshold value, and outputs the optical input signal detected by the first optical level detection unit. An optical input signal to be output to the optical signal switching means when the optical level detection result received by the first optical level detection unit is equal to or less than a threshold, assuming that the signal is transmitted through the working transmission line. A switching request signal indicating the content of switching from the signal transmitted on the working transmission path to the signal transmitted on the protection transmission path is transmitted, and the optical input signal detected by the second optical level detection unit is transmitted. If the signal is a signal transmitted through the protection-side transmission path, and the optical level detection result received by the second optical level detection unit is equal to or smaller than the threshold, the optical signal output to the optical signal switching means is output. By transmitting a switching request signal representing the content of switching from the signal transmitted on the protection line to the signal transmitted on the working line as an input signal, when the level of the optical signal transmitted through the optical path network is reduced. Even so, it is possible to prevent a decrease in the reliability of the entire optical path network.
【００１３】請求項２記載の発明は、現用側伝送路を伝
送する第１の光入力信号の光レベルを検出し、該検出結
果を第１の検出信号として出力する第１の光レベル検出
部と、予備側伝送路を伝送する第２の光入力信号の光レ
ベルを検出し、該検出結果を第２の検出信号として出力
する第２の光レベル検出部と、前記第１の検出信号及び
第２の検出信号を入力し、これら第１の検出信号及び第
２の検出信号で表されるそれぞれの光レベルが所定の閾
値以下である場合は、切り換え要求信号を出力する光レ
ベル識別手段と、前記切り換え要求信号に基づき、出力
する光出力信号を、前記第１の光入力信号若しくは第２
の光入力信号のいずれか一方に切り換える光信号切換手
段とを有することを特徴とする。According to a second aspect of the present invention, there is provided a first optical level detecting section for detecting an optical level of a first optical input signal transmitted through a working transmission line and outputting the detection result as a first detection signal. A second optical level detection unit that detects an optical level of a second optical input signal transmitted through the protection-side transmission path and outputs the detection result as a second detection signal; A light level discriminating means for receiving a second detection signal and outputting a switching request signal when each light level represented by the first detection signal and the second detection signal is equal to or less than a predetermined threshold value; And outputting an optical output signal to be output based on the switching request signal to the first optical input signal or the second optical input signal.
Optical signal switching means for switching to any one of the above optical input signals.
【００１４】従って、この発明によれば、光入力信号の
レベルを光レベル検出部が検出し、検出結果を光レベル
識別手段に送出し、光レベル識別手段では、受信した光
レベル検出結果とあらかじめ設定された閾値とを比較
し、第１の光レベル検出部が検出する光入力信号が現用
側伝送路を伝送した信号である場合に、第１の光レベル
検出部において受信した光レベル検出結果が閾値以下で
あった場合に、光信号切換手段に対して出力する光入力
信号として現用側伝送路を伝送した信号から予備側伝送
路を伝送した信号に切り換える内容を表す切り換え要求
信号を送出すると共に、第２の光レベル検出部が検出す
る光入力信号が予備側伝送路を伝送した信号であるとし
た場合に、第２の光レベル検出部において受信した光レ
ベル検出結果が閾値以下であった場合に、光信号切換手
段に対して出力する光入力信号として予備側伝送路を伝
送した信号から現用側伝送路を伝送した信号に切り換え
る内容を表す切り換え要求信号を送出することにより、
光パス網を伝送する光信号のレベル低下が発生した場合
であっても、光パス網全体の信頼性の低下を防止するこ
とができる。Therefore, according to the present invention, the level of the optical input signal is detected by the optical level detection section, and the detection result is sent to the optical level identification means. When the optical input signal detected by the first optical level detection unit is a signal transmitted through the working transmission line, the optical level detection result received by the first optical level detection unit is compared with the set threshold value. Is less than or equal to the threshold, a switching request signal is transmitted as an optical input signal to be output to the optical signal switching means, the switching request signal representing the content of switching from the signal transmitted through the working transmission path to the signal transmitted through the protection transmission path. Also, if the optical input signal detected by the second optical level detection unit is a signal transmitted on the protection side transmission line, the optical level detection result received by the second optical level detection unit is equal to the threshold value. If it is below, by transmitting a switching request signal representing the content of switching from the signal transmitted on the protection transmission line to the signal transmitted on the working transmission line as an optical input signal to be output to the optical signal switching means. ,
Even if the level of the optical signal transmitted through the optical path network is reduced, it is possible to prevent the reliability of the entire optical path network from being reduced.
【００１５】[0015]
【発明の実施の形態】次に、図面を参照して本発明に係
る光パス網及び光パス網切り換え装置の一実施形態につ
いて説明する。図２に、本発明に係る光パス網の一実施
形態のブロック図を示す。DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of an optical path network and an optical path network switching device according to the present invention will be described with reference to the drawings. FIG. 2 is a block diagram showing one embodiment of the optical path network according to the present invention.
【００１６】図２に示されているように、この実施形態
に係る光パス網は、４つの光クロスコネクト装置１、
２、３及び４と、２つの光分岐／挿入多重化装置（以
下、光ＡＤＭ装置という。）５及び６と、光パス網を構
成する装置間を結ぶ６本の現用伝送路７、８、９、１
０、１１及び１２と、光パス網を構成する装置間を結ぶ
６本の予備伝送路１３、１４、１５、１６、１７及び１
８とから構成されている。この図２からも明らかなよう
に、これらそれぞれの現用伝送路と予備伝送路とはそれ
ぞれ対になって構成されている。As shown in FIG. 2, the optical path network according to this embodiment includes four optical cross-connect devices 1,
2, 3, and 4; two optical add / drop multiplexers (hereinafter, referred to as optical ADM devices) 5 and 6; and six working transmission lines 7, 8, connecting devices constituting an optical path network. 9, 1
Six spare transmission lines 13, 14, 15, 16, 17 and 1 connecting 0, 11, and 12 with the devices constituting the optical path network.
And 8. As is apparent from FIG. 2, each of the working transmission line and the protection transmission line is configured as a pair.
【００１７】また、４つの光クロスコネクト装置１〜
４、及び２つの光ＡＤＭ装置５及び６には、光パス網を
伝送している光信号が、いずれかの伝送区間で光信号の
劣化が生じた場合、若しくは、ある装置内部で光信号の
劣化が生じた場合に、この光信号の劣化を検出し、現用
伝送路７〜１２を伝送する光信号と予備伝送路１３〜１
８を伝送する光信号とのいずれかから、出力する光信号
を切り換える光信号切り換え部１９〜３０が具備されて
いる。Further, four optical cross-connect devices 1 to
4 and the two optical ADM devices 5 and 6 are provided with an optical signal transmitted through the optical path network when the optical signal is degraded in any of the transmission sections, or within a certain device. When the deterioration occurs, the deterioration of the optical signal is detected, and the optical signal transmitted through the working transmission lines 7 to 12 and the protection transmission lines 13 to 1 are detected.
Optical signal switching units 19 to 30 are provided for switching an optical signal to be output from any one of the optical signals transmitting the optical signal 8.
【００１８】このそれぞれの光パス網に接続されている
装置に具備されている光信号切り換え部の個数は、図２
に示されているように、例えば光クロスコネクト装置１
には３個、光ＡＤＭ装置６には１個というように、光パ
ス網においてそれぞれの装置が接続している他の装置の
個数に対応している。The number of optical signal switching units provided in the devices connected to the respective optical path networks is shown in FIG.
As shown in FIG. 1, for example, the optical cross-connect device 1
Corresponds to the number of other devices connected to each device in the optical path network, such as three for the optical ADM device 6 and one for the optical ADM device 6.
【００１９】ただし、図２に示される本発明に係る光パ
ス網の一実施形態では、４つの光クロスコネクト装置１
〜４、及び２つの光ＡＤＭ装置５及び６を具備するとし
たが、本発明はこのような光パス網に限定されるもので
はなく、光クロスコネクト装置や光ＡＤＭ装置の数は任
意に拡張することが可能である。また、その他の装置を
この光パス網に接続させても良い。However, in one embodiment of the optical path network according to the present invention shown in FIG. 2, four optical cross-connect devices 1 are provided.
4 and two optical ADM devices 5 and 6, but the present invention is not limited to such an optical path network, and the number of optical cross-connect devices and optical ADM devices can be arbitrarily expanded. It is possible. Further, other devices may be connected to this optical path network.
【００２０】次に、図２に示される光パス網に接続され
ているそれぞれの装置が具備している光信号切り換え部
について説明する。図１に、図２に示す光パス網が有す
る光信号切り換え部１９の構造のブロック図を示す。こ
の光信号切り換え部１９は、本発明に係る光パス網切り
換え装置の一実施形態となっている。また、図２に示す
光パス網が有する光信号切り換え部１９以外の他の光信
号切り換え部２０〜３０の構造についても、この図１に
示される光信号部１９の構造と同様なのでその説明を省
略する。Next, an optical signal switching unit provided in each device connected to the optical path network shown in FIG. 2 will be described. FIG. 1 is a block diagram showing the structure of the optical signal switching unit 19 included in the optical path network shown in FIG. This optical signal switching unit 19 is an embodiment of the optical path network switching device according to the present invention. The structure of the optical signal switching units 20 to 30 other than the optical signal switching unit 19 included in the optical path network shown in FIG. 2 is the same as the structure of the optical signal unit 19 shown in FIG. Omitted.
【００２１】図１に示されるように、この光信号切り換
え部１９は、現用伝送路７を伝送する光入力信号の光レ
ベルを検出する光レベル検出部４１と、予備伝送路１３
を伝送する光入力信号の光レベルを検出する光レベル検
出部４２と、光レベル検出部４１及び光レベル検出部４
２のそれぞれから出力された光レベルの検出結果を表す
信号が入力し、この入力した信号に基づき光出力信号切
り換え部４４に切り換え要求信号４５を出力する光レベ
ル識別部４３と、切り換え要求信号４５に基づき、出力
する光出力信号４６として現用伝送路７を伝送する光入
力信号と予備伝送路１３を伝送する光入力信号とのいず
れかに切り換える光出力信号切り換え部４４とから構成
される。As shown in FIG. 1, the optical signal switching section 19 includes an optical level detecting section 41 for detecting an optical level of an optical input signal transmitted through the working transmission line 7 and a protection transmission line 13.
Optical level detector 42 for detecting the optical level of the optical input signal transmitting the optical signal, optical level detector 41 and optical level detector 4
2, a light level identification unit 43 that outputs a switching request signal 45 to an optical output signal switching unit 44 based on the input signals, and a switching request signal 45. The optical output signal switching unit 44 switches between the optical input signal transmitted through the working transmission path 7 and the optical input signal transmitted through the protection transmission path 13 as the optical output signal 46 to be output.
【００２２】次に、この図１に示される光信号切り換え
部１９における光信号の切り換え動作について説明す
る。Next, the switching operation of the optical signal in the optical signal switching section 19 shown in FIG. 1 will be described.
【００２３】現用伝送路７を伝送する光入力信号は、光
出力信号切り換え部４４に入力すると共に、光レベル検
出部４１にも入力する。また、予備伝送路１３を伝送す
る光入力信号は、光出力信号切り換え部４４に入力する
と共に、光レベル検出部４２にも入力する。The optical input signal transmitted through the working transmission line 7 is input to the optical output signal switching unit 44 and also to the optical level detection unit 41. The optical input signal transmitted through the protection transmission line 13 is input to the optical output signal switching unit 44 and also to the optical level detection unit 42.
【００２４】現用伝送路７を伝送する光入力信号を入力
した光レベル検出部４１、及び予備伝送路１３を伝送す
る光入力信号を入力した光レベル検出部４２は共に、そ
れらの光レベルを検出し、この検出結果を表す信号を光
レベル識別部４３に出力する。The optical level detector 41, which receives the optical input signal transmitted through the working transmission path 7, and the optical level detector 42, which receives the optical input signal transmitted through the protection transmission path 13, both detect their optical levels. Then, a signal representing the detection result is output to the optical level discrimination unit 43.
【００２５】光レベル検出部４１及び光レベル検出部４
２から出力された光レベルの検出結果を表す信号を入力
した光レベル識別部４３は、これらの信号により表され
る光入力信号のレベルと、予め設定された閾値とを比較
して、光入力信号のレベルがこの閾値以下であった場合
は、光出力信号切り換え部４４に対して切り換え要求信
号４５を出力する。Light level detector 41 and light level detector 4
The optical level discriminating unit 43, which has received the signals representing the detection results of the optical levels output from the optical input unit 2, compares the level of the optical input signal represented by these signals with a preset threshold value, and If the signal level is equal to or lower than the threshold value, a switching request signal 45 is output to the optical output signal switching unit 44.
【００２６】従って、現用伝送路７を伝送する光入力信
号の光入力信号のレベルが予め設定された閾値以下であ
り、予備伝送路１３を伝送する光入力信号の光入力信号
のレベルが予め設定された閾値より大きい場合は、現用
伝送路７を伝送する光入力信号から予備伝送路１３を伝
送する光入力信号に切り換えることを表す切り換え要求
信号４５を出力し、逆に、予備伝送路１３を伝送する光
入力信号の光入力信号のレベルが予め設定された閾値以
下であり、現用伝送路７を伝送する光入力信号の光入力
信号のレベルが予め設定された閾値より大きい場合は、
予備伝送路１３を伝送する光入力信号から現用伝送路７
を伝送する光入力信号に切り換えることを表す切り換え
要求信号４５を出力する。Therefore, the level of the optical input signal of the optical input signal transmitted through the working transmission path 7 is equal to or less than a predetermined threshold value, and the level of the optical input signal of the optical input signal transmitted through the protection transmission path 13 is set in advance. If the threshold value is larger than the threshold value, a switching request signal 45 indicating that the optical input signal transmitted through the working transmission path 7 is switched to the optical input signal transmitted through the protection transmission path 13 is output. When the level of the optical input signal of the optical input signal to be transmitted is equal to or less than a preset threshold and the level of the optical input signal of the optical input signal to be transmitted through the working transmission path 7 is larger than the preset threshold,
From the optical input signal transmitted through the protection transmission line 13 to the current transmission line 7
A switching request signal 45 indicating that switching to an optical input signal for transmitting is performed.
【００２７】上記光レベル識別部４３に設定された閾値
は、光パス網を管理する管理者や光パス網を利用する利
用者等が、図１に示される光信号切り換え部１９〜３０
のそれぞれについて個別の閾値を予め設定しても良い
し、光信号切り換え部１９〜３０の全体について一定の
閾値を設定しても良い。The threshold value set in the optical level discriminating section 43 is determined by an administrator who manages the optical path network or a user who uses the optical path network, by the optical signal switching sections 19 to 30 shown in FIG.
May be set in advance for each of them, or a fixed threshold may be set for the entire optical signal switching units 19 to 30.
【００２８】光出力信号切り換え部４４は、出力する光
出力信号４６として、上述の切り換え要求信号４５に基
づき、閾値以下になっている光入力信号からその光レベ
ルが閾値より大きくなっている光入力信号に、つまり、
現用伝送路７を伝送する光入力信号から予備伝送路１３
を伝送する光入力信号へと、若しくは、その逆というよ
うに、その出力を切り換える。The light output signal switching section 44 outputs, as the light output signal 46, an optical input signal whose light level is higher than the threshold based on the switch request signal 45 from the light input signal which is lower than the threshold. In the signal, that is,
From the optical input signal transmitted through the working transmission path 7 to the protection transmission path 13
The output is switched to an optical input signal that transmits the signal or vice versa.
【００２９】従って、この実施形態によれば、現用伝送
路７を伝送する光入力信号と、予備伝送路１３を伝送す
る光入力信号との双方の光入力信号のレベルを検出し、
この検出した結果を予め設定された閾値と比較して、出
力される光出力信号４６を切り換えるので、光パス網に
おいて、光信号断が発生する以前の、光信号の劣化が発
生した状態において光信号の切り換えを実行することが
でき、信頼性の高い光パス網を構築することができる。Therefore, according to this embodiment, the levels of the optical input signals transmitted through the working transmission path 7 and the optical input signal transmitted through the protection transmission path 13 are detected,
Since the detected result is compared with a preset threshold value and the output optical signal 46 is switched, the optical output signal is switched in the optical path network in a state where the optical signal has deteriorated before the optical signal disconnection occurs. Signal switching can be performed, and a highly reliable optical path network can be constructed.
【００３０】[0030]
【発明の効果】以上の説明から明らかなように、本発明
によれば、現用側伝送路を伝送する第１の光入力信号の
光レベルを検出し、予備側伝送路を伝送する第２の光入
力信号の光レベルを検出し、これらの検出結果と、予め
設定された閾値とに基づき、切り換え要求信号が出力さ
れ、この切り換え要求信号に基づいて出力する光信号を
第１の光入力信号、若しくは第２の光入力信号のいずれ
かに切り換え、光信号断が発生していなくとも、光信号
の劣化が発生した状態において光信号の切り換えを実現
することができるので、その信頼性が低下してしまうこ
とを防止することが可能な光パス網及び光パス網切り換
え装置を提供することができる。As apparent from the above description, according to the present invention, the optical level of the first optical input signal transmitted through the working transmission line is detected, and the second optical signal transmitted through the protection transmission line is detected. An optical level of the optical input signal is detected, a switching request signal is output based on the detection result and a preset threshold, and an optical signal output based on the switching request signal is converted to a first optical input signal. Or the second optical input signal, and even if the optical signal is not interrupted, the optical signal can be switched in a state where the optical signal is deteriorated, so that the reliability is reduced. It is possible to provide an optical path network and an optical path network switching device capable of preventing such a situation from occurring.
【図１】本発明に係る光パス網切り換え装置を光信号切
り換え部に適用した場合の一実施形態のブロック図であ
る。FIG. 1 is a block diagram of an embodiment in which an optical path network switching device according to the present invention is applied to an optical signal switching unit.
【図２】本発明に係る光パス網の一実施形態のブロック
図である。FIG. 2 is a block diagram of an embodiment of an optical path network according to the present invention.
【符号の説明】 １〜４ 光クロスコネクト装置 ５、６ 光ＡＤＭ装置 ７〜１２ 現用伝送路 １３〜１８ 予備伝送路 １９〜３０ 光信号切り換え部 ４１、４２ 光レベル検出部 ４３ 光レベル識別部 ４４ 光出力信号切り換え部 ４５ 切り換え要求信号 ４６ 光出力信号[Description of Signs] 1-4 Optical cross-connect device 5, 6 Optical ADM device 7-12 Working transmission line 13-18 Standby transmission line 19-30 Optical signal switching unit 41, 42 Optical level detection unit 43 Optical level identification unit 44 Optical output signal switching section 45 Switching request signal 46 Optical output signal
Claims (2)
分岐挿入多重化装置とを有する光パス網において、 前記光クロスコネクト装置と光分岐挿入多重化装置との
それぞれが、 現用側伝送路を伝送する第１の光入力信号の光レベルを
検出し、該検出結果を第１の検出信号として出力する第
１の光レベル検出部と、 予備側伝送路を伝送する第２の光入力信号の光レベルを
検出し、該検出結果を第２の検出信号として出力する第
２の光レベル検出部と、 前記第１の検出信号及び第２の検出信号を入力し、これ
ら第１の検出信号及び第２の検出信号により表されるそ
れぞれの光レベルが所定の閾値以下である場合は、切り
換え要求信号を出力する光レベル識別手段と、 前記切り換え要求信号に基づき、出力する光出力信号
を、前記第１の光入力信号若しくは第２の光入力信号の
いずれか一方に切り換える光信号切換手段とを有する光
パス網切り換え装置を有することを特徴とする光パス
網。1. An optical path network having at least an optical cross-connect device and an optical add / drop multiplexer, wherein each of the optical cross-connect device and the optical add / drop multiplexer transmits a working transmission line. A first optical level detection unit that detects an optical level of the first optical input signal and outputs the detection result as a first detection signal; and an optical level of a second optical input signal that is transmitted through the protection-side transmission path. And a second light level detection unit that outputs the detection result as a second detection signal; and inputs the first detection signal and the second detection signal, and outputs the first detection signal and the second detection signal. When each light level represented by the detection signal is equal to or less than a predetermined threshold, an optical level identification unit that outputs a switching request signal; and an optical output signal that is output based on the switching request signal, Optical input signal Or optical path network, characterized in that it comprises an optical path network switching device having a light signal switching means for switching to either one of the second optical input signal.
号の光レベルを検出し、該検出結果を第１の検出信号と
して出力する第１の光レベル検出部と、 予備側伝送路を伝送する第２の光入力信号の光レベルを
検出し、該検出結果を第２の検出信号として出力する第
２の光レベル検出部と、 前記第１の検出信号及び第２の検出信号を入力し、これ
ら第１の検出信号及び第２の検出信号で表されるそれぞ
れの光レベルが所定の閾値以下である場合は、切り換え
要求信号を出力する光レベル識別手段と、 前記切り換え要求信号に基づき、出力する光出力信号
を、前記第１の光入力信号若しくは第２の光入力信号の
いずれか一方に切り換える光信号切換手段とを有するこ
とを特徴とする光パス網切り換え装置。2. A first optical level detector for detecting an optical level of a first optical input signal transmitted through a working transmission line and outputting the detection result as a first detection signal; A second optical level detection unit that detects an optical level of a second optical input signal transmitting the second optical signal, and outputs a result of the detection as a second detection signal; and outputs the first detection signal and the second detection signal. Input, and when the respective light levels represented by the first detection signal and the second detection signal are equal to or less than a predetermined threshold value, a light level identification means for outputting a switching request signal; And an optical signal switching means for switching an output optical signal to one of the first optical input signal and the second optical input signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9114113A JPH10303814A (en) | 1997-05-02 | 1997-05-02 | Optical path network and optical path network changeover device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9114113A JPH10303814A (en) | 1997-05-02 | 1997-05-02 | Optical path network and optical path network changeover device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH10303814A true JPH10303814A (en) | 1998-11-13 |
Family
ID=14629464
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9114113A Pending JPH10303814A (en) | 1997-05-02 | 1997-05-02 | Optical path network and optical path network changeover device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH10303814A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009284046A (en) * | 2008-05-20 | 2009-12-03 | Dx Antenna Co Ltd | Optical switch, center apparatus, sub-center apparatus and light transmission system |
| JP2010273047A (en) * | 2009-05-20 | 2010-12-02 | Nec Magnus Communications Ltd | Device, method and program for changing over optical path |
| JP2012160938A (en) * | 2011-02-01 | 2012-08-23 | Nec Corp | Path switching control system and path switching control method |
| WO2015049794A1 (en) * | 2013-10-04 | 2015-04-09 | 三菱電機株式会社 | Light transmission path switch device and light transmission system |
-
1997
- 1997-05-02 JP JP9114113A patent/JPH10303814A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009284046A (en) * | 2008-05-20 | 2009-12-03 | Dx Antenna Co Ltd | Optical switch, center apparatus, sub-center apparatus and light transmission system |
| JP2010273047A (en) * | 2009-05-20 | 2010-12-02 | Nec Magnus Communications Ltd | Device, method and program for changing over optical path |
| JP2012160938A (en) * | 2011-02-01 | 2012-08-23 | Nec Corp | Path switching control system and path switching control method |
| WO2015049794A1 (en) * | 2013-10-04 | 2015-04-09 | 三菱電機株式会社 | Light transmission path switch device and light transmission system |
| CN105612699A (en) * | 2013-10-04 | 2016-05-25 | 三菱电机株式会社 | Light transmission path switch device and light transmission system |
| JPWO2015049794A1 (en) * | 2013-10-04 | 2017-03-09 | 三菱電機株式会社 | Optical transmission line switching device and optical transmission system |
| US9628173B2 (en) | 2013-10-04 | 2017-04-18 | Mitsubishi Electric Corporation | Optical transmission line switching apparatus and optical transmission system |
| CN105612699B (en) * | 2013-10-04 | 2017-11-07 | 三菱电机株式会社 | Light transmission path switching device and optical transmission system |
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