JPH0468829A - Non-call signal transmitter - Google Patents
Non-call signal transmitterInfo
- Publication number
- JPH0468829A JPH0468829A JP2179068A JP17906890A JPH0468829A JP H0468829 A JPH0468829 A JP H0468829A JP 2179068 A JP2179068 A JP 2179068A JP 17906890 A JP17906890 A JP 17906890A JP H0468829 A JPH0468829 A JP H0468829A
- Authority
- JP
- Japan
- Prior art keywords
- optical fiber
- optical
- wavelength
- maintenance
- service
- 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.)
- Pending
Links
- 239000013307 optical fiber Substances 0.000 claims abstract description 43
- 230000003287 optical effect Effects 0.000 claims abstract description 33
- 238000012423 maintenance Methods 0.000 claims abstract description 23
- 238000004891 communication Methods 0.000 claims description 25
- 230000008054 signal transmission Effects 0.000 claims description 3
- 239000000835 fiber Substances 0.000 claims description 2
- 230000005540 biological transmission Effects 0.000 description 11
- 238000005259 measurement Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 238000000253 optical time-domain reflectometry Methods 0.000 description 3
- 230000006866 deterioration Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
Landscapes
- Optical Communication System (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野］
本発明は、電話線に光ファイバケーブルを用いる場合に
、その伝送特性の測定に用いる保守用波長領域を有効利
用する非通話信号伝送装置に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a non-call signal transmission device that effectively utilizes the maintenance wavelength range used to measure the transmission characteristics of optical fiber cables when using them as telephone lines. .
光ファイバケーブルを用いた光通信では、複数の波長の
光でそれぞれ異なる信号を同時に伝送することが可能に
なっている。実用化されている波長多重方式はこの原理
を用いたものであり、情報チャネルごとに波長を割り当
て、光カブラその他の合分波器で光信号を波長多重ある
いは分離する多重化伝送技術である。Optical communications using optical fiber cables make it possible to simultaneously transmit different signals using light of multiple wavelengths. The wavelength multiplexing system in practical use uses this principle, and is a multiplexing transmission technology in which a wavelength is assigned to each information channel, and optical signals are wavelength-multiplexed or separated using optical couplers or other multiplexers/demultiplexers.
一方、光ファイバケーブルの保守のために定期的に、ま
た障害時にはその都度、光ファイバの伝送特性を測定し
て劣化状態や破断点の特定が行われる。その測定法は、
主に光ファイバのコアで発生するレイリー散乱の後方散
乱光の減衰量を検出するものであるが、運用中の光ファ
イバについての測定では上述の波長多重化技術が応用さ
れている。On the other hand, the transmission characteristics of the optical fiber are measured periodically for maintenance of the optical fiber cable, and whenever a failure occurs, to identify the state of deterioration or breakage point. The measurement method is
This method mainly detects the amount of attenuation of Rayleigh scattering backscattered light generated in the core of an optical fiber, and the above-mentioned wavelength multiplexing technology is applied to measurements on optical fibers in operation.
第２図は、従来の光ファイバの特性測定システムの構成
例を示すブロック図である。FIG. 2 is a block diagram showing a configuration example of a conventional optical fiber characteristic measurement system.
図において、通信に用いられる波長（光通信波長）とは
別の波長の光パルスを光カプラ゛２１を介して測定する
光ファイバ２３に入射させ、その後方散乱光を再び光カ
プラ２１を介して分離し、特性測定装置（ＯＴＤＲ）２
５で所定のレベルに対する減衰量を測定し、光ファイバ
ケーブルの診断を行う構成になっている。ここで、光通
信波長とは別に保守用に用いられる波長を保守用波長と
いう。In the figure, a light pulse with a wavelength different from the wavelength used for communication (optical communication wavelength) is made incident on an optical fiber 23 for measurement via an optical coupler 21, and the backscattered light is sent back via the optical coupler 21. Separate and characteristic measuring device (OTDR) 2
5, the attenuation amount for a predetermined level is measured and the optical fiber cable is diagnosed. Here, a wavelength used for maintenance separately from the optical communication wavelength is referred to as a maintenance wavelength.
なお、各光ファイバケーブルごとに特性測定装置２５と
の接続は、スイッチ回路２７により順次切り換えられる
。Note that the connection to the characteristic measuring device 25 for each optical fiber cable is sequentially switched by the switch circuit 27.
ところで、このような保守用波長の光パルスを用いて行
う光ファイバケーブルの伝送特性の測定は、局に収容さ
れる光ファイバケーブルに対して順次行われるが、収容
回線数が膨大であるために各光ファイバケーブルからみ
れば一部に１〜２回程度の頻度となる。しかもその測定
時間は高々１０秒程度である。By the way, measurements of the transmission characteristics of optical fiber cables using optical pulses at maintenance wavelengths are performed sequentially on the optical fiber cables accommodated in the station, but due to the huge number of lines accommodated, it is difficult to measure the transmission characteristics of optical fiber cables. Looking at each optical fiber cable, the frequency is about once or twice for some parts. Moreover, the measurement time is about 10 seconds at most.
すなわち、各光ファイバケーブルに保守用波長の光パル
スが入射されるのは、光ファイバケーブルの伝送特性の
測定時だけであるので極々限られた短い時間であり、そ
の他の大部分の時間では保守用波長領域は空き状態とい
える。In other words, the optical pulse of the maintenance wavelength is applied to each optical fiber cable only when measuring the transmission characteristics of the optical fiber cable, so it is only for a very limited and short period of time, and most of the other time is used for maintenance purposes. It can be said that the used wavelength region is vacant.
また、従来の電話において、電話線（メタ肝ンクケーブ
ル）が通話に用いられていないときには、少なくとも局
とその電話機との間は無信号状態であるので、その時間
に電話線を使って音楽や案内などを流すサービスが一部
実用化されている。以下、このように無通話時に情報信
号を伝送することを「オフトーク通信」という。In addition, with conventional telephones, when the telephone line (metalink cable) is not being used for calls, there is no signal between the station and the telephone, so you can use the telephone line to listen to music or listen to music. Some services that provide information such as information have been put into practical use. Hereinafter, such transmission of information signals during no calls will be referred to as "off-talk communication."
なお、通常、このオフトーク通信で伝送される信号は局
側から送出されることが多く、電話機の所有者は電話線
から分岐し、例えば専用スピーカからその音楽あるいは
案内などを常時聴ける形態で利用される。Note that the signals transmitted in this off-talk communication are usually sent from the central office, and the owner of the telephone can branch off from the telephone line and use it in a form that allows him to listen to the music or guidance at any time, for example, through a dedicated speaker. Ru.
しかし、このオフトーク通信は、本来は電話に用いられ
ている回線を利用しているために、電話を使用する時（
発呼あるいは着呼）には、直ちに電話側に切り換えられ
る仕組みになっている。したがって、電話の利用頻度が
比較的□低い場合にはオフトーク通信の利用価値は高い
が、利用頻度が高かったり、例□えばデータ通信に用い
て長時間回線を使用する状態では、中断が多いなどオフ
トーク通信の利用価値は相対的に低下せざる得なかった
。However, since this off-talk communication uses the lines originally used for telephones, when using the telephone (
When making or receiving a call, the system immediately switches to the telephone side. Therefore, when the frequency of telephone use is relatively low, off-talk communication has high utility value, but when the frequency of telephone use is high, for example, when the line is used for a long time for data communication, there are many interruptions. The value of off-talk communication has inevitably declined relatively.
本発明は、電話線に光ファイバケーブルを用いる場合に
、従来大部分の時間が空きとなっている保守用波墓の領
域を利用し、オフトーク通信と同様のサービスを通話の
有無にかかわらず供給することができる非通話信号伝送
装置を提供することを目的とする。The present invention utilizes the maintenance wave area, which is conventionally vacant most of the time, when optical fiber cables are used for telephone lines, and provides a service similar to off-talk communication regardless of whether or not a call is being made. It is an object of the present invention to provide a non-call signal transmission device that can perform the following functions.
本発明は、局に収容される複数の通話線に光ファイバケ
ーブルを用い、通話信号を所定の光通信波長の光信号で
伝送し、また該光通信波長と異なる保守用波長の光パル
スで該光ファイバケーブルの特性測定を順次行う光通信
装置において、前記保守用波長の光パルスで特性測定処
理を行っていない光ファイバケーブルに、通話以外のサ
ービス情報を該保守用波長′の光信号で送出するサービ
ス供給手段を備えて構成する。The present invention uses optical fiber cables for a plurality of communication lines accommodated in a station, transmits communication signals as optical signals of a predetermined optical communication wavelength, and transmits communication signals using optical pulses of a maintenance wavelength different from the optical communication wavelength. In an optical communication device that sequentially measures the characteristics of optical fiber cables, service information other than telephone calls is sent as an optical signal at the maintenance wavelength to the optical fiber cables whose characteristics have not been measured using optical pulses at the maintenance wavelength. The system is equipped with a service supply means for providing services.
本発明は、従来光ファイバの特性側定時以外には使用さ
れていなかった保守用波長の領域の光信号を用いて、通
話以外のサービス情報を伝送させることにより、保守用
波長の領域を有効利用することができるとともに、近年
需要が高まってきたオフトーク通信と同様のサービス情
報の提供を通話に左右されずに供給することがヤきる。The present invention makes effective use of the maintenance wavelength region by transmitting service information other than telephone calls using an optical signal in the maintenance wavelength region, which has conventionally been used only for scheduled times on the characteristic side of optical fibers. In addition, it is possible to provide service information similar to off-talk communications, which has been in increasing demand in recent years, without being affected by telephone calls.
以下、図面に基づいて本発明の実施例について詳細に説
明する。Hereinafter, embodiments of the present invention will be described in detail based on the drawings.
第１図は、本発明：の一実施例構成を示すプロツり図で
ある。FIG. 1 is a diagram showing the configuration of an embodiment of the present invention.
図において、局側の伝送装置（電気光変換器）１１に接
続される光ファイバ１２と、利用者側の伝送装置（電気
光変換器）１５に接続される光ファイバ１６は、光カプ
ラ２１、光ファイバ２３、光カプラ２２を介して接続さ
れる。光カプラ２１で分岐される光ファイバ１３には、
スイッチ回路２７を介して特性測定装置（ＯＴＤＲ）２
５が接続される。In the figure, an optical fiber 12 connected to a transmission device (electro-optic converter) 11 on the station side and an optical fiber 16 connected to a transmission device (electro-optic converter) 15 on the user side are an optical coupler 21, It is connected via an optical fiber 23 and an optical coupler 22. The optical fiber 13 branched by the optical coupler 21 includes
Characteristic measuring device (OTDR) 2 via switch circuit 27
5 is connected.
ここで、本発明の特徴とするところは、本実施例では、
スイッチ回路２７に特性測定装置２５と切り換えられる
サービス供給装置３１を接続し、また利用者側で光カプ
ラ２２で分岐される光ファイバ１７にサービス受信装置
３３を接続する構成にある。Here, the features of the present invention are as follows in this embodiment:
The switch circuit 27 is connected to the characteristic measuring device 25 and the service supply device 31 that can be switched, and the service receiving device 33 is connected to the optical fiber 17 branched by the optical coupler 22 on the user side.
なお、サービス供給装置３１およびサービス受信装置３
３は、保守用波長の光で所要のサービス供給信号を伝送
する構成である。Note that the service supply device 31 and the service reception device 3
3 is a configuration in which a required service supply signal is transmitted using light of a maintenance wavelength.
このような構成において、スイッチ回路２７は、従来と
同様に各光ファイバ１２の特性を調べるために、順次特
性測定装置２５との接続を切り換えるが、通常、特性測
定装置２５に接続していない光ファイバ１２には、サー
ビス供給装置３１が接続される。In such a configuration, the switch circuit 27 sequentially switches the connection to the characteristic measuring device 25 in order to check the characteristics of each optical fiber 12 as in the conventional case, but normally, the switching circuit 27 switches the connection to the characteristic measuring device 25 in order to check the characteristics of each optical fiber 12. A service supply device 31 is connected to the fiber 12 .
したがって、特性測定のための保守用波長の光パルスが
送出されていないときには、サービス供給装置３１から
、スイッチ回路２７、光ファイバ１３、光カブラ２Ｉ、
光ファイバ２３、光カブラ２２、光ファイバ１７の経路
を介してサービス受信装置３３にサービス供給信号が伝
送される。Therefore, when an optical pulse of a maintenance wavelength for characteristic measurement is not sent out, the service supply device 31 sends a signal to the switch circuit 27, the optical fiber 13, the optical coupler 2I,
A service supply signal is transmitted to the service receiving device 33 via the optical fiber 23, optical coupler 22, and optical fiber 17 path.
このように、電話線に光ファイバが用いられた場合には
保守用波長の領域を利用することにより、従来のオフト
ーク通信と同様のサービスを通話時に遮断されることな
く受けることができる。In this way, when optical fiber is used for the telephone line, by using the maintenance wavelength region, it is possible to receive the same service as conventional off-talk communication without being interrupted during a call.
なお、各光ファイバの特性測定時にはサービス供給信号
の送出は停止されるが、その頻度からみて特に支障とな
ることはない。Although the transmission of the service supply signal is stopped when measuring the characteristics of each optical fiber, this does not pose a particular problem considering the frequency.
上述したように、本発明は、通常はほとんど使用されな
い保守用波長の領域を非通話信号の伝送に用いることに
より、通話以外のサービスを安価に提供することができ
る。As described above, the present invention makes it possible to provide services other than telephone calls at low cost by using the maintenance wavelength region, which is usually rarely used, for transmitting non-call signals.
第１図は本発明の一実施例構成を示すブロック図。
第２図は従来の光ファイバの特性測定システムの構成例
を示すブロック図。
１１．１５・・・伝送装置、１２．１３．１６．１７．
２３・・・光ファイバ、２１．２２・・・光カブラ、２
５・・・特性測定装置（ＯＴＤＲ）、２７・・・スイ。
子回路、３１・・・サービス供給装置、３３・・・サー
ビス受信装置。
−１！FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention. FIG. 2 is a block diagram showing a configuration example of a conventional optical fiber characteristic measurement system. 11.15...Transmission device, 12.13.16.17.
23... Optical fiber, 21.22... Optical coupler, 2
5... Characteristic measuring device (OTDR), 27... Sui. Child circuit, 31... Service supply device, 33... Service reception device. -1!
Claims (1)
ルを用い、通話信号を所定の光通信波長の光信号で伝送
し、また該光通信波長と異なる保守用波長の光パルスで
該光ファイバケーブルの特性測定を順次行う光通信装置
において、 前記保守用波長の光パルスで特性測定処理を行っていな
い光ファイバケーブルに、通話以外のサービス情報を該
保守用波長の光信号で送出するサービス供給手段を備え
た ことを特徴とする非通話信号伝送装置。(1) Optical fiber cables are used for multiple communication lines accommodated in a station, and communication signals are transmitted as optical signals with a predetermined optical communication wavelength, and optical pulses with a maintenance wavelength different from the optical communication wavelength are used to transmit the communication signals. In an optical communication device that sequentially measures the characteristics of fiber cables, a service that sends service information other than telephone calls using an optical signal of the maintenance wavelength to the optical fiber cable whose characteristics have not been measured using optical pulses of the maintenance wavelength. A non-speech signal transmission device characterized by comprising a supply means.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2179068A JPH0468829A (en) | 1990-07-06 | 1990-07-06 | Non-call signal transmitter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2179068A JPH0468829A (en) | 1990-07-06 | 1990-07-06 | Non-call signal transmitter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0468829A true JPH0468829A (en) | 1992-03-04 |
Family
ID=16059543
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2179068A Pending JPH0468829A (en) | 1990-07-06 | 1990-07-06 | Non-call signal transmitter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0468829A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024023992A1 (en) * | 2022-07-27 | 2024-02-01 | 日本電信電話株式会社 | Optical transmission system and optical path setting/congestion control method |
-
1990
- 1990-07-06 JP JP2179068A patent/JPH0468829A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024023992A1 (en) * | 2022-07-27 | 2024-02-01 | 日本電信電話株式会社 | Optical transmission system and optical path setting/congestion control method |
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