JP2977344B2 - Optical fiber transmission system - Google Patents
Optical fiber transmission systemInfo
- Publication number
- JP2977344B2 JP2977344B2 JP29743991A JP29743991A JP2977344B2 JP 2977344 B2 JP2977344 B2 JP 2977344B2 JP 29743991 A JP29743991 A JP 29743991A JP 29743991 A JP29743991 A JP 29743991A JP 2977344 B2 JP2977344 B2 JP 2977344B2
- Authority
- JP
- Japan
- Prior art keywords
- terminal
- optical
- switch
- transmission
- subscriber
- 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 - Fee Related
Links
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- Optical Communication System (AREA)
- Monitoring And Testing Of Exchanges (AREA)
- Monitoring And Testing Of Transmission In General (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は光ファイバ伝送システ
ム、より具体的には光ファイバ伝送システムにおける光
冗長構成に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical fiber transmission system, and more particularly, to an optical redundant configuration in an optical fiber transmission system.
【０００２】[0002]
【従来の技術】光ファイバ伝送システムは、たとえば加
入者側に設置された加入者側光送受信装置（以後、加入
者側装置と称す）と、これと対向して局側に設けられた
局側光送受信装置（以後、加入者側装置と称す）とが１
本の光ファイバにより接続されている。局側装置に対し
加入者側装置が１対１に存在するこのような光ファイバ
伝送システムでは、従来、局側装置の故障により光信号
の送受信ができなくなることを防ぐため、同様のシステ
ムを１加入者毎に２セット設けて二重化する冗長構成を
とっていた。2. Description of the Related Art An optical fiber transmission system includes, for example, a subscriber-side optical transmission / reception device (hereinafter referred to as a subscriber-side device) installed on a subscriber side, and an office-side device provided on the office side in opposition to this. The number of optical transmission / reception devices (hereinafter, referred to as a subscriber device) is 1
They are connected by an optical fiber. In such an optical fiber transmission system in which a subscriber unit is provided one-to-one with respect to an optical line terminal, a similar system is conventionally used in order to prevent transmission and reception of an optical signal due to a failure of the optical line unit. A redundant configuration is adopted in which two sets are provided for each subscriber and duplicated.
【０００３】図７には、このような冗長構成をとる光フ
ァイバ伝送システムの構成例が示されている。加入者側
装置５０−１〜５０−ｎはそれぞれ、通常時に使用され
る加入者側光送受信部１０−ａと故障時に使用される加
入者側光送受信部10−ｂとにより構成される。同様に局
側装置６０−１〜６０−ｎはそれぞれ、伝送路光ファイ
バ２００−ａを介して加入者側光送受信部１０−ａに接
続される局側光送受信部１４−ａと、伝送路光ファイバ
２００−ｂを介して加入者側光送受信部１０−ｂに接続
される局側光送受信部１４−ｂとにより構成されてい
る。このような光ファイバ伝送システムにおいて、通常
時は、伝送路光ファイバ２００−ａを介して加入者側光
送受信部１０−ａと局側光送受信部１４−ａにより情報
の伝送を行う。FIG. 7 shows a configuration example of an optical fiber transmission system having such a redundant configuration. Each of the subscriber-side devices 50-1 to 50-n includes a subscriber-side optical transmission / reception unit 10-a used during normal operation and a subscriber-side optical transmission / reception unit 10-b used during failure. Similarly, the optical line terminals 60-1 to 60-n respectively include an optical line transmitting / receiving section 14-a connected to the optical transmitting / receiving section 10-a via the transmission line optical fiber 200-a, It comprises a station-side optical transceiver 14-b connected to the subscriber-side optical transceiver 10-b via the optical fiber 200-b. In such an optical fiber transmission system, information is normally transmitted by the optical transmission / reception unit 10-a on the subscriber side and the optical transmission / reception unit 14-a on the station side via the transmission line optical fiber 200-a.
【０００４】また、何らかの理由でたとえば局側光送受
信部１４−ａ等が故障したとき、予備系の局側光送受信
部１４−ｂにより伝送路光ファイバ２００−ｂを介して
加入者側光送受信部１０−ｂと情報の伝送を行う。この
ように従来の光ファイバ伝送システムでは、１加入者に
対して加入者側装置の光送受信部と局側装置の光送受信
部を二重化構成することにより故障時における復旧処理
を行うものであった。If, for some reason, for example, the optical line transmitting / receiving section 14-a or the like fails, the optical line transmitting / receiving section 14-b of the standby system transmits / receives the optical signal to the subscriber side via the transmission line optical fiber 200-b. It transmits information to and from the unit 10-b. As described above, in the conventional optical fiber transmission system, recovery processing in the event of a failure is performed by duplexing the optical transmission / reception unit of the subscriber unit and the optical transmission / reception unit of the central unit for one subscriber. .
【０００５】[0005]
【発明が解決しようとする課題】しかしながらこのよう
な従来技術では、１加入者毎に加入者側光送受信部と局
側光送受信部をそれぞれ２セット用意しなければならな
かった。すなわち、従来の光ファイバ伝送システムは、
故障時等に備え、信頼性の高いシステムを実現するため
に２倍の設備投資を行なうものであった。一方、たとえ
ば局側光送受信部の信頼性は二重化を必要とする程低く
はなく、ｎ個の局側光送受信部に１個の割合で予備を設
けるｎ＋１予備系で十分その信頼性を保証できる。した
がって従来の光ファイバ伝送システムは、その設備が過
剰に大きくなり、資源を有効に活用していないという欠
点があった。However, in such a conventional technique, two sets of the subscriber-side optical transceiver and the station-side optical transceiver must be prepared for each subscriber. That is, the conventional optical fiber transmission system
In order to prepare for a highly reliable system in case of a failure or the like, a double capital investment is required. On the other hand, for example, the reliability of the optical transmission / reception unit on the station side is not so low as to require duplication, and the reliability can be sufficiently ensured by an (n + 1) standby system in which one spare is provided for n optical transmission / reception units on the station side. . Therefore, the conventional optical fiber transmission system has the disadvantage that the equipment becomes excessively large and resources are not effectively used.
【０００６】本発明はこのような従来技術の欠点を解消
し、ｎ台の局側装置光送受信部を１台の局側装置予備光
送受信部にて冗長することにより、従来に比べ遙に少な
い設備で信頼性の高い光ファイバ伝送システムを提供す
ることを目的とする。The present invention solves such disadvantages of the prior art, and makes n station optical transmission / reception sections redundant with one station side auxiliary optical transmission / reception section. It is an object of the present invention to provide a highly reliable optical fiber transmission system with equipment.
【０００７】[0007]
【課題を解決するための手段】本発明は上述の課題を解
決するために、加入者側に配設された加入者側光送受信
手段と、局側に配設された局側光送受信手段とが光ファ
イバで接続され、光ファイバを介して情報の伝送を行う
光ファイバ伝送システムは、ｎ個の加入者側光送受信手
段と、ｎ個の局側光送受信手段と、第１の端子，第２の
端子，第３の端子及び第４の端子を有し、第１の端子と
第４の端子間及び第２の端子と第３の端子間が接続して
いる状態と、第１の端子と第３の端子間及び第２の端子
と第４の端子間が接続している状態とを選択的に切り換
え可能な、ｎ個の２×２スイッチ手段と、ｎ番目の２×
２スイッチ手段の第４の端子に接続された予備の局側光
送受信手段等の第１の光送受信手段と、１番目の２×２
スイッチ手段の第１の端子に接続された第２の光送受信
手段とを有している。ｍ番目の２×２スイッチ手段の、
第２の端子はｍ番目の加入者側光層受信手段側に接続さ
れ、第３の端子がｍ番目の局側光送受信手段側に接続さ
れ、１番目の２×２スイッチ手段以外の第1の端子がｍ-
1番目の２×２スイッチ手段の第４の端子に接続され、
ｎ番目の２×２スイッチ手段以外の第４の端子がｍ+1番
目の２×２スイッチ手段の第１の端子に接続されること
により、ｎ個の２×２スイッチ手段がシリーズに接続さ
れている。そしてこれらのｎ個の２×２スイッチ手段は
正常動作状態では第１の端子と第４の端子間及び第２の
端子と第３の端子間が接続している状態となっている。SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a subscriber-side optical transmission / reception means provided on a subscriber side, and a station-side optical transmission / reception means provided on a station side. Are connected by an optical fiber and transmit information via the optical fiber. The optical fiber transmission system comprises n subscriber-side optical transmission / reception means, n station-side optical transmission / reception means, a first terminal, and a first terminal. A second terminal, a third terminal, and a fourth terminal, wherein the first terminal and the fourth terminal are connected to each other, and the second terminal and the third terminal are connected to each other; 2.times.2 switch means capable of selectively switching between a state in which the terminal is connected to the third terminal and a state in which the second terminal is connected to the fourth terminal;
A first optical transmission / reception unit such as a standby optical transmission / reception unit connected to a fourth terminal of the two-switch unit;
A second optical transmission / reception means connected to the first terminal of the switch means. of the m-th 2 × 2 switch means,
The second terminal is connected to the m-th subscriber side optical layer receiving means side, the third terminal is connected to the m-th optical transmission / reception means side, and the first terminal other than the first 2 × 2 switch means. Terminal is m-
Connected to the fourth terminal of the first 2 × 2 switch means,
By connecting the fourth terminals other than the n-th 2 × 2 switch means to the first terminal of the (m + 1) -th 2 × 2 switch means, n pieces of 2 × 2 switch means are connected in series. ing. In the normal operation state, these n 2 × 2 switch means are connected between the first terminal and the fourth terminal and between the second terminal and the third terminal.
【０００８】[0008]
【作用】本発明によれば、局側光送受信手段が故障した
場合には、２×２スイッチ手段によりこの故障した局側
光送受信手段を切り離し、これに代わって予備の局側光
送受信手段を加入者側光送受信手段に接続し、光信号の
情報伝達を行う。According to the present invention, when the optical transmission / reception means on the station side fails, the optical transmission / reception means on the failure is cut off by the 2 × 2 switch means, and a spare optical transmission / reception means on the station side is replaced by the switching means. It is connected to the optical transmission / reception means on the subscriber side to transmit information of optical signals.
【０００９】[0009]
【実施例】次に添付図面を参照して本発明による光ファ
イバ伝送システムの実施例を詳細に説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an optical fiber transmission system according to the present invention will be described in detail with reference to the accompanying drawings.
【００１０】図１を参照すると本発明による光ファイバ
伝送システムの一実施例を示すシステム構成図が示され
ている。本実施例における光ファイバ伝送システムは、
同図に示すようにｎ個（ｎは２以上）の２×２光スイッ
チ１２−１〜１２−ｎにより構成される光スイッチ１３
が局側に配設され、これに加入者側光送受信部１０、局
側光送受信部１４が接続されている。Referring to FIG. 1, there is shown a system configuration diagram showing an embodiment of an optical fiber transmission system according to the present invention. The optical fiber transmission system in the present embodiment includes:
As shown in the figure, an optical switch 13 composed of n (n is 2 or more) 2 × 2 optical switches 12-1 to 12-n
Is arranged on the station side, and the subscriber side optical transmitting / receiving section 10 and the station side optical transmitting / receiving section 14 are connected to this.
【００１１】すなわち、回線毎に加入者宅内に配設され
る光信号の送受信を行う加入者側光送受信部１０（１０
−１〜１０−ｎ）はそれぞれ、対応する参照符号の伝送
路光ファイバ１００（１００−１〜１００−ｎ）を介し
て２×２光スイッチ１２（１２−１〜１２−ｎ）に接続
されている。また、２×２光スイッチ１２（１２−１〜
１２−ｎ）は、対応する参照符号の伝送路光ファイバ１
０２（１０２−１〜１０２−ｎ）を介して光信号の送受
信を行う局側光送受信部１４（１４−１〜１４−ｎ）に
接続されている。That is, a subscriber-side optical transmission / reception unit 10 (10) for transmitting and receiving an optical signal provided in a subscriber's home for each line.
-1 to 10-n) are connected to 2 × 2 optical switches 12 (12-1 to 12-n) via transmission line optical fibers 100 (100-1 to 100-n) of corresponding reference numerals, respectively. ing. The 2 × 2 optical switch 12 (12-1 to 12-1)
12-n) is the transmission line optical fiber 1 of the corresponding reference symbol.
02 (102-1 to 102-n) are connected to the optical transmission / reception units 14 (14-1 to 14-n) for transmitting and receiving optical signals.
【００１２】各２×２光スイッチ１２は、伝送路光ファ
イバ１０２を介して接続されている局側光送受信部１４
が故障したときなどに切り換えられる光スイッチであ
り、シリーズに接続されている。すなわち、２×２光ス
イッチ１２−１は２×２光スイッチ１２−２と、２×２
光スイッチ１２−２は２×２光スイッチ１２−３と、２
×２光スイッチ１２−３は２×２光スイッチ１２−４と
接続され、このような接続が光スイッチ１２−ｎまで続
けられる。２×２光スイッチ１２−ｎはまた、伝送路光
ファイバ１１０−ｎを介して予備の局側光送受信部１６
に接続されている。予備の局側光送受信部１６は、局側
光送受信部１４−１〜１４−ｎのいずれかが故障などに
なったときに、これに代わって加入者側光送受信部１０
と光信号の送受信を行う局側光送受信部である。Each 2 × 2 optical switch 12 is connected to a station-side optical transmitting / receiving unit 14 connected via a transmission line optical fiber 102.
This is an optical switch that can be switched when a failure occurs, and is connected to a series. That is, the 2 × 2 optical switch 12-1 is composed of the 2 × 2 optical switch 12-2 and the 2 × 2 optical switch 12-2.
The optical switch 12-2 includes a 2 × 2 optical switch 12-3 and a 2 × 2 optical switch 12-3.
The × 2 optical switch 12-3 is connected to the 2 × 2 optical switch 12-4, and such connection is continued up to the optical switch 12-n. The 2 × 2 optical switch 12-n is also connected to the standby optical transmission / reception unit 16 via the transmission line optical fiber 110-n.
It is connected to the. The spare optical transmission / reception unit 16 replaces the subscriber optical transmission / reception unit 10 when one of the optical transmission / reception units 14-1 to 14-n fails.
And an optical transmission / reception unit for transmitting and receiving optical signals.
【００１３】図２には、正常時における２×２光スイッ
チのスイッチングを示した説明図が示されている。２×
２光スイッチ１２は、ポート１（端子１）、ポート２
（端子２）、ポート３（端子３）およびポート４（端子
４）を有し、これらポート間の接続を切り換えることに
よりスイッチングを行う。２×２光スイッチ１２−ｍ
（ｍ＝２〜ｎ）のポート２は加入者側光送受信部１０−
ｍと対応する伝送路光ファイバ１００−ｍにより接続さ
れ、２×２光スイッチ１２−ｍのポート３は伝送路光フ
ァイバ１０２−ｍを介して局側光送受信部１４−ｍと接
続されている。また、局側光送受信部１４−ｍが正常な
場合、ポート２とポート３が光スイッチ内で接続され、
ポート１とポート４が光スイッチ内で接続されている。
また、局側光送受信部１４−ｍ−１に対応する２×２光
スイッチ１２−ｍ−１のポート４と、局側光送受信部１
４−ｍに対応する２×２光スイッチ１２−ｍのポート１
とが光ファイバ１１０−ｍ−１で接続されている。さら
に、ｍ＝ｎの場合には図１に示すように２×２光スイッ
チ１２−ｎのポート４は予備の局側光送受信部１６と光
ファイバ１１０−ｎで接続される。図１には、すべての
局側光送受信部１４の故障なき正常動作状態のシステム
構成が示されている。FIG. 2 is an explanatory diagram showing switching of the 2 × 2 optical switch in a normal state. 2x
The two-optical switch 12 has a port 1 (terminal 1), a port 2
(Terminal 2), port 3 (terminal 3) and port 4 (terminal 4), and switching is performed by switching the connection between these ports. 2 × 2 optical switch 12-m
The port 2 of (m = 2 to n) is a subscriber-side optical transceiver 10-
m and the corresponding transmission line optical fiber 100-m, and the port 3 of the 2 × 2 optical switch 12-m is connected to the optical transmission / reception unit 14-m via the transmission line optical fiber 102-m. . When the optical transmission / reception unit 14-m is normal, the port 2 and the port 3 are connected in the optical switch,
Port 1 and port 4 are connected in the optical switch.
The port 4 of the 2 × 2 optical switch 12-m-1 corresponding to the optical transmission / reception unit 14-m-1 and the optical transmission / reception unit 1
Port 1 of 2 × 2 optical switch 12-m corresponding to 4-m
Are connected by an optical fiber 110-m-1. Further, when m = n, as shown in FIG. 1, the port 4 of the 2 × 2 optical switch 12-n is connected to the standby optical transmission / reception unit 16 by the optical fiber 110-n. FIG. 1 shows a system configuration in a normal operation state of all the optical transmission / reception units 14 without failure.
【００１４】図３には局側光送受信部１４−３が故障し
たときのシステム構成図が、また図４にはそのスイッチ
ング動作がそれぞれ示されている。同図に示すようにた
とえば局側光送受信部１２−３が故障となった場合、対
応する２×２光スイッチ１２−３のポート１とポート３
を図４に示す様に光スイッチ１２−３内で接続し、ポー
ト２とポート４を光スイッチ１２−３内で接続する。２
×２光スイッチ１２−３をこのように切り換えることに
より、加入者側光送受信部１０−３がシステムから切り
離されるとともに、予備の局側光送受信部１６が加入者
側光送受信部１０−３に接続され通信サービスが行われ
る。このように予備の局側光送受信部１６で一時的に対
応した場合、故障した局側光送受信部１４−３を交換し
た後、２×２光スイッチ１２−３を再び図２に示すよう
に接続する。FIG. 3 is a system configuration diagram when the optical transmission / reception section 14-3 on the station side fails, and FIG. 4 shows a switching operation thereof. As shown in the figure, for example, when the optical transmission / reception unit 12-3 on the station side fails, the ports 1 and 3 of the corresponding 2 × 2 optical switch 12-3 are used.
Are connected in the optical switch 12-3 as shown in FIG. 4, and the ports 2 and 4 are connected in the optical switch 12-3. 2
By switching the × 2 optical switch 12-3 in this manner, the subscriber optical transmission / reception unit 10-3 is disconnected from the system, and the spare office optical transmission / reception unit 16 is connected to the subscriber optical transmission / reception unit 10-3. Connected and communication service is performed. In the case where the standby optical transmission / reception unit 16 temporarily responds as described above, after replacing the failed optical transmission / reception unit 14-3 which has failed, the 2 × 2 optical switch 12-3 is again switched as shown in FIG. Connecting.
【００１５】図５には、光ファイバ伝送システムの他の
実施例として、２×２光スイッチ１２を含む伝送路１０
０の試験および加入者側光送受信部１０の動作試験を行
う動作試験ユニット２４と、局側伝送路光ファイバ１０
２を含む局側光送受信部１４の動作試験を行う動作試験
ユニット１８とを追加したときのシステム構成が示され
ている。この実施例では、１×２光スイッチ２０を設
け、これにより予備の局側光送受信部１６と試験ユニッ
ト１６の切り換え制御を行っている。１×２光スイッチ
２０は、そのポート１が光ファイバ１１０−ｎを介して
２×２光スイッチ１２−ｎのポート４と接続され、その
ポート２が光ファイバ１１２により予備の局側光送受信
部１６と接続され、そのポート３が光ファイバ１１４を
介し試験ユニット２４と接続されている。また、局側光
送受信部１４−１に対応する２×２光スイッチ１２−１
のポート１には、局側光送受信部動作試験ユニット１８
が光ファイバ１２０により接続されている。FIG. 5 shows a transmission line 10 including a 2 × 2 optical switch 12 as another embodiment of the optical fiber transmission system.
0 and an operation test of the optical transmission / reception unit 10 of the subscriber side,
2 shows a system configuration when an operation test unit 18 for performing an operation test of the optical transmission / reception unit 14 including the station 2 is added. In this embodiment, a 1 × 2 optical switch 20 is provided to control switching between the standby optical transmission / reception unit 16 and the test unit 16. The 1 × 2 optical switch 20 has a port 1 connected to a port 4 of a 2 × 2 optical switch 12-n via an optical fiber 110-n, and a port 2 connected to an auxiliary optical transmission / reception unit by an optical fiber 112. The port 3 is connected to the test unit 24 via the optical fiber 114. Also, a 2 × 2 optical switch 12-1 corresponding to the optical transmission / reception section 14-1 on the station side.
Port 1 has an optical transmission / reception unit operation test unit 18
Are connected by an optical fiber 120.
【００１６】たとえば、局側光送受信部１４の動作試験
と、２×２光スイッチ１２を含む伝送路光ファイバ１０
０および加入者側光送受信部１０の動作試験を行う場
合、１×２光スイッチ２０のポート１とポート３を光ス
イッチ２０内で接続する。そして、局側光送受信部１４
−ｍに対応する２×２光スイッチ１２−ｍを順に図６の
ように光スイッチ内接続すれば、局側光送受信部１４−
１〜１４−ｎが局側光送受信部動作試験ユニット１８と
順に接続されて動作試験が行なわれる。また、前述した
ように１×２光スイッチ２０のポート１とポート３が光
スイッチ２０内で接続されているため、試験ユニット２
４が光スイッチ１２−１〜ｎを含む加入者側の伝送路光
ファイバ１００−１〜１−ｎと加入者側光送受信部１０
−１〜１０−ｎとに順次接続されて試験される。これに
より、システム内の線路の接続はずれや断線の有無等
や、加入者側光送受信部１０−１〜１０−ｎの動作の確
認を行うことが可能になる。これは、各々の局側光送受
信部１４と加入者側光送受信部１０との対向における故
障時に、故障部位の発見や、局側光送受信部１４故障時
に交換した局側光送受信部１４の動作試験にも使用でき
る。なお図５には、局側光送受信部１４−４と伝送路光
ファイバ１００−４および加入者側光送受信部１０−４
の動作試験を、試験ユニット１８および２４により行う
ときの接続構成例が示されている。また同実施例におい
て、局側光送受信部１４が故障したときには、図５に示
す１×２光スイッチ２０のポート１とポート２を光スイ
ッチ内接続することで、図３に示したのと同様の冗長構
成をとることができる。For example, an operation test of the optical transmission / reception unit 14 at the station side and the transmission line optical fiber 10 including the 2 × 2 optical switch 12 are performed.
When the operation test of the optical transmission and reception unit 0 and the subscriber side optical transmission unit 10 is performed, the ports 1 and 3 of the 1 × 2 optical switch 20 are connected in the optical switch 20. Then, the station-side optical transmission / reception unit 14
If the 2.times.2 optical switches 12-m corresponding to -m are sequentially connected in the optical switch as shown in FIG.
1 to 14 -n are sequentially connected to the station side optical transmission / reception unit operation test unit 18 to perform an operation test. Further, as described above, since port 1 and port 3 of the 1 × 2 optical switch 20 are connected in the optical switch 20, the test unit 2
4 is a subscriber-side transmission line optical fiber 100-1 to 1-n including optical switches 12-1 to 12-n and a subscriber-side optical transmission / reception unit 10
-1 to 10-n are sequentially connected and tested. As a result, it is possible to confirm the disconnection or disconnection of the line in the system, and to confirm the operation of the optical transmission / reception units 10-1 to 10-n on the subscriber side. This is because when a failure occurs in the opposition between the optical transmission / reception unit 14 and the optical transmission / reception unit 10 at the subscriber side, a failure site is found, and the operation of the optical transmission / reception unit 14 exchanged when the optical transmission / reception unit 14 fails. Can also be used for testing. FIG. 5 shows the optical transmission / reception unit 14-4 on the station side, the optical fiber 100-4 on the transmission line, and the optical transmission / reception unit 10-4 on the subscriber side.
2 shows an example of a connection configuration when the operation test is performed by the test units 18 and 24. In this embodiment, when the optical transmission / reception unit 14 in the station side fails, the port 1 and the port 2 of the 1 × 2 optical switch 20 shown in FIG. Redundant configuration can be adopted.
【００１７】なお、これら実施例では光スイッチ１３を
２×２光スイッチ１２を複数設けることにより構成した
が、たとえば同様のスイッチングを行える光スイッチで
あれば光スイッチ１３の内部はとくにこれに限定される
ものではない。In these embodiments, the optical switch 13 is constituted by providing a plurality of 2 × 2 optical switches 12. However, for example, the inside of the optical switch 13 is limited to an optical switch capable of performing the same switching. Not something.
【００１８】[0018]
【発明の効果】このように本発明の光ファイバ伝送シス
テムによれば、ｎ台の局側光送受信部に対し１台の予備
の局側光送受信部で冗長することができる。このため、
高信頼性を維持するとともに設備を最小限に抑えること
が出来る。また、局側光送受信部の動作試験ユニットま
たは伝送路試験および加入者側光送受信部の動作試験ユ
ニットを設けることにより、局側光送受信部、加入者側
光送受信部および伝送路光ファイバの動作試験などが可
能となる。なお、本実施例では局側光送受信部１台に対
し、加入者側光送受信部１台という構成で説明したが、
加入者側の伝送路に光スイッチ、合分波等の光分岐を配
設して集線しても同様の効果が期待できる。すなわち、
このような光ファイバ伝送システムでも光スイッチを設
けて予備系に切り換えるシステムであれば本発明の範疇
に含まれる。As described above, according to the optical fiber transmission system of the present invention, one standby optical transmission / reception unit can be made redundant with respect to n optical transmission / reception units. For this reason,
The equipment can be kept to a minimum while maintaining high reliability. In addition, by providing an operation test unit or transmission line test for the optical transmission / reception unit on the station side and an operation test unit for the optical transmission / reception unit on the subscriber side, the operation of the optical transmission / reception unit on the station side, the optical transmission / reception unit on the subscriber side, and the optical fiber on the transmission line can be performed. Testing becomes possible. In the present embodiment, a configuration has been described in which one optical transmission / reception unit on the station side and one optical transmission / reception unit on the subscriber side are used.
The same effect can be expected even if an optical switch such as an optical switch or a multiplexing / demultiplexing device is arranged on the transmission line on the subscriber side to converge the line. That is,
Even in such an optical fiber transmission system, any system provided with an optical switch to switch to a standby system is included in the scope of the present invention.
【図１】本発明による光ファイバ伝送システムの一実施
例を示すシステム構成図、FIG. 1 is a system configuration diagram showing one embodiment of an optical fiber transmission system according to the present invention;
【図２】図１の実施例において、局側光送受信部が正常
動作のときの光スイッチの接続を示す動作説明図、FIG. 2 is an operation explanatory diagram showing connection of an optical switch when the optical transmission / reception unit on the station side operates normally in the embodiment of FIG. 1;
【図３】図１の実施例において、第３番目の加入者側光
送受信部が故障したときの接続例を示すシステム構成
図、FIG. 3 is a system configuration diagram showing a connection example when a third optical transmission / reception unit on the subscriber side fails in the embodiment of FIG. 1;
【図４】図３に示した状態における光スイッチの接続動
作を示す動作説明図、FIG. 4 is an operation explanatory diagram showing a connection operation of the optical switch in the state shown in FIG. 3;
【図５】本発明による光ファイバ伝送システムの他の実
施例を示すシステム構成図、FIG. 5 is a system configuration diagram showing another embodiment of the optical fiber transmission system according to the present invention;
【図６】図５に示した実施例における局側光送受信部の
動作試験、伝送路試験、加入者側光送受信部の動作試験
を行う際の光スイッチの接続状態を示した動作説明図、FIG. 6 is an operation explanatory diagram showing a connection state of an optical switch when performing an operation test, a transmission path test, and an operation test of a subscriber-side optical transceiver in the embodiment shown in FIG. 5;
【図７】従来技術における光ファイバ伝送システムのシ
ステム構成図である。FIG. 7 is a system configuration diagram of an optical fiber transmission system in the related art.
１０−１〜１０−ｎ 加入者側光送受信部 １２−１〜１２−ｎ ２×２光スイッチ １４−１〜１４−ｎ 局側光送受信部 １６ 予備の局側光送受信部 １８，２４ 動作試験ユニット ２０ １×２光スイッチ 10-1 to 10-n Subscriber-side optical transceiver 12-1 to 12-n 2x2 optical switch 14-1 to 14-n Station-side optical transceiver 16 Spare station-side optical transceiver 18, 24 Operation test Unit 20 1 × 2 optical switch
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 昭62−219720（ＪＰ，Ａ) 特開 昭62−39921（ＪＰ，Ａ) 特開 昭55−86231（ＪＰ，Ａ) 特開 平３−187533（ＪＰ，Ａ) 特開 平３−187529（ＪＰ，Ａ) 実公 昭61−28436（ＪＰ，Ｙ２) (58)調査した分野(Int.Cl.6，ＤＢ名) H04B 10/00 - 10/28 H04J 14/00 - 14/08 H04B 3/46 H04B 17/00 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-62-219720 (JP, A) JP-A-62-39921 (JP, A) JP-A-55-86231 (JP, A) 187533 (JP, A) JP-A-3-187529 (JP, A) Jikken Sho 61-28436 (JP, Y2) (58) Fields investigated (Int. Cl. 6 , DB name) H04B 10/00-10 / 28 H04J 14/00-14/08 H04B 3/46 H04B 17/00
Claims (3)
手段と、局側に配設された局側光送受信手段とが光ファ
イバで接続され、前記光ファイバを介して情報の伝送を
行う光ファイバ伝送システムにおいて、 ｎ個（ｎは２以上）の加入者側光送受信手段と、 ｎ個の局側光送受信手段と、 第１の端子，第2の端子，第3の端子及び第4の端子を有
し、前記第１の端子と前記第4の端子間及び前記第2の端
子と前記第3の端子間が接続している状態と、 前記第１の端子と前記第３の端子間及び前記第２の端子
と前記第４の端子間が接続している状態とを選択的に切
り換え可能な、ｎ個の２×２スイッチ手段と、 ｎ番目の前記２×２スイッチ手段の前記第４の端子に接
続された予備の局側光送受信手段と、 １番目の前記２×２スイッチ手段の前記第１の端子に接
続された前記局側光送受信手段の動作試験を行うための
試験手段とを有し、 ｋ番目の前記２×２スイッチ手段の、前記第２の端子は
ｋ番目の前記加入者側光送受信手段側に接続され、前記
第3の端子がｋ番目の前記局側光送受信手段側に接続さ
れ、前記１番目の２×２スイッチ手段以外の前記第1の
端子がk-1番目の前記２×２スイッチ手段の前記第４の
端子に接続され、前記ｎ番目の２×２スイッチ手段以外
の前記第４の端子がk+1番目の前記２×２スイッチ手段
の前記第１の端子に接続されることにより、前記ｎ個の
２×２スイッチ手段がシリーズに接続されており、 前記ｎ個の２×２スイッチ手段は正常動作状態では前記
第１の端子と前記第４の端子間及び前記第２の端子と前
記第３の端子間が接続している状態となっており、前記
ｎ個の局側光送受信手段のいずれかを前記予備の局側光
送受信手段と切り換える場合には、前記ｎ個の２×２ス
イッチ手段中の対応する２×２スイッチ手段について前
記第１の端子と前記第３の端子間及び前記第２の端子と
前記第４の端子間が接続している状態に切り換えること
を特徴とする光ファイバ伝送システム。1. A subscriber-side optical transmission / reception means provided on a subscriber side and a station-side optical transmission / reception means provided on a station side are connected by an optical fiber, and information is transmitted through the optical fiber. N (where n is 2 or more) subscriber-side optical transmitting / receiving means, n station-side optical transmitting / receiving means, a first terminal, a second terminal, a third terminal, and A state in which a fourth terminal is connected between the first terminal and the fourth terminal and between the second terminal and the third terminal; and a state in which the first terminal is connected to the third terminal. N 2 × 2 switch means capable of selectively switching between a state of the second terminal and a state in which the second terminal is connected to the fourth terminal; and an n-th 2 × 2 switch means A spare optical transmission / reception means connected to the fourth terminal of the first and second terminals of the first 2 × 2 switch means; Test means for performing an operation test of the optical transmission / reception means connected to the optical communication apparatus, wherein the second terminal of the k-th 2 × 2 switch means is the k-th optical transmission / reception apparatus for the subscriber side. Means, the third terminal is connected to the k-th optical transmission / reception means side, and the first terminal other than the first 2 × 2 switch means is the (k-1) th 2nd switch. The fourth terminal other than the n-th 2 × 2 switch is connected to the fourth terminal of the × 2 switch, and the fourth terminal other than the n-th 2 × 2 switch is connected to the first terminal of the (k + 1) -th 2 × 2 switch. The n pieces of 2 × 2 switch means are connected in series, and the n pieces of 2 × 2 switch means are connected between the first terminal and the fourth terminal and in the normal operation state. The second terminal is connected to the third terminal, and the n stations are connected to each other. When any one of the optical transmitting / receiving means is switched with the spare optical transmission / reception means, the first terminal and the third terminal are connected to the corresponding 2 × 2 switching means among the n 2 × 2 switching means. An optical fiber transmission system characterized by switching between terminals and between the second terminal and the fourth terminal.
手段と、局側に配設された局側光送受信手段とが光ファ
イバで接続され、前記光ファイバを介して情報の伝送を
行う光ファイバ伝送システムにおいて、 ｎ個（ｎは２以上）の加入者側光送受信手段と、 ｎ個の局側光送受信手段と、 第１の端子，第2の端子，第3の端子及び第4の端子を有
し、前記第１の端子と前記第4の端子間及び前記第2の端
子と前記第3の端子間が接続している状態と、 前記第１の端子と前記第３の端子間及び前記第２の端子
と前記第４の端子間が接続している状態とを選択的に切
り換え可能な、ｎ個の２×２スイッチ手段と、 ｎ番目の前記２×２スイッチ手段の前記第４の端子に接
続された伝送路試験および加入者側光送受信部の動作試
験を行うための第１の試験手段と、 １番目の前記２×２スイッチ手段の前記第１の端子に接
続された前記局側光送受信手段の動作試験を行うための
第２の試験手段とを有し、 ｋ番目の前記２×２スイッチ手段の、前記第２の端子は
ｋ番目の前記加入者側光送受信手段側に接続され、前記
第3の端子がｋ番目の前記局側光送受信手段側に接続さ
れ、前記１番目の２×２スイッチ手段以外の前記第1の
端子がk-1番目の前記２×２スイッチ手段の前記第４の
端子に接続され、前記ｎ番目の２×２スイッチ手段以外
の前記第４の端子がk+1番目の前記２×２スイッチ手段
の前記第１の端子に接続されることにより、前記ｎ個の
２×２スイッチ手段がシリーズに接続されており、 前記ｎ個の２×２スイッチ手段は正常動作状態では前記
第１の端子と前記第４の端子間及び前記第２の端子と前
記第３の端子間が接続している状態となっており、動作
試験を行う場合には前記ｎ個の２×２スイッチ手段中の
対応する２×２スイッチ手段について前記第１の端子と
前記第３の端子間及び前記第２の端子と前記第４の端子
間が接続している状態に切り換えることを特徴とする光
ファイバ伝送システム。2. The optical transmission / reception means provided on the subscriber side and the optical transmission / reception means provided on the station side are connected by an optical fiber, and information is transmitted through the optical fiber. N (where n is 2 or more) subscriber-side optical transmitting / receiving means, n station-side optical transmitting / receiving means, a first terminal, a second terminal, a third terminal, and A state in which a fourth terminal is connected between the first terminal and the fourth terminal and between the second terminal and the third terminal; and a state in which the first terminal is connected to the third terminal. N 2 × 2 switch means capable of selectively switching between a state of the second terminal and a state in which the second terminal is connected to the fourth terminal; and an n-th 2 × 2 switch means First test means for performing a transmission path test connected to the fourth terminal and an operation test of the optical transmission / reception unit on the subscriber side; Second test means for performing an operation test of the optical line transmitting / receiving means connected to the first terminal of the first 2 × 2 switch means, and the k-th 2 × 2 switch means The second terminal of the switch means is connected to the k-th optical transmission / reception means side of the subscriber side, the third terminal is connected to the k-th optical transmission / reception means side of the station, The first terminal other than the × 2 switch is connected to the fourth terminal of the (k−1) th 2 × 2 switch, and the fourth terminal other than the n-th 2 × 2 switch is connected to the first terminal. being connected to the first terminal of the (k + 1) th 2 × 2 switch means, the n pieces of 2 × 2 switch means are connected in series, and the n pieces of 2 × 2 switch means Are in a normal operation state between the first terminal and the fourth terminal and between the second terminal and the fourth terminal. Are connected to each other, and when an operation test is performed, the first terminal and the third terminal are connected to the corresponding 2 × 2 switch means among the n 2 × 2 switch means. An optical fiber transmission system characterized by switching between terminals and between the second terminal and the fourth terminal.
において、前記第１の試験手段による伝送路試験および
加入者側光送受信部の動作試験と前記第２の試験手段に
よる局側光送受信手段の動作試験が同時に行われること
を特徴とする光ファイバ伝送システム。3. The optical fiber transmission system according to claim 2, wherein said first test means performs a transmission path test and an operation test of a subscriber-side optical transmission / reception unit, and said second test means performs a test of a station-side optical transmission / reception means. An optical fiber transmission system wherein operation tests are performed simultaneously.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29743991A JP2977344B2 (en) | 1991-11-13 | 1991-11-13 | Optical fiber transmission system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29743991A JP2977344B2 (en) | 1991-11-13 | 1991-11-13 | Optical fiber transmission system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05136733A JPH05136733A (en) | 1993-06-01 |
| JP2977344B2 true JP2977344B2 (en) | 1999-11-15 |
Family
ID=17846539
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP29743991A Expired - Fee Related JP2977344B2 (en) | 1991-11-13 | 1991-11-13 | Optical fiber transmission system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2977344B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7835268B2 (en) | 2005-07-29 | 2010-11-16 | Kddi Corporation | Optical termination system |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4992472B2 (en) * | 2006-07-26 | 2012-08-08 | 日本電気株式会社 | PON system, station side apparatus, and redundancy method used therefor |
-
1991
- 1991-11-13 JP JP29743991A patent/JP2977344B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7835268B2 (en) | 2005-07-29 | 2010-11-16 | Kddi Corporation | Optical termination system |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH05136733A (en) | 1993-06-01 |
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