JPH0787020A - Monitoring method for optical transmission line - Google Patents
Monitoring method for optical transmission lineInfo
- Publication number
- JPH0787020A JPH0787020A JP5249995A JP24999593A JPH0787020A JP H0787020 A JPH0787020 A JP H0787020A JP 5249995 A JP5249995 A JP 5249995A JP 24999593 A JP24999593 A JP 24999593A JP H0787020 A JPH0787020 A JP H0787020A
- Authority
- JP
- Japan
- Prior art keywords
- transmission line
- optical
- signal
- optical signal
- monitoring
- 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
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- Optical Communication System (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明の光伝送路の監視方法は光
パッシングネットワーク等の光伝送路の断線検出等に利
用されるものである。BACKGROUND OF THE INVENTION The method of monitoring an optical transmission line according to the present invention is used for detecting disconnection of an optical transmission line such as an optical passing network.
【０００２】[0002]
【従来の技術】画像伝送用の光ファイバ（光伝送路）の
損傷、断線等を監視することは従来から行われてきた。
従来の監視方法は図２に示す様に光伝送路１に主信号系
からの画像信号（主光信号）を光カプラ３を通して、Ｏ
ＴＤＲ系から同光カプラ３を通して監視光信号を伝送
し、光伝送路１からの監視光信号のレーリ散乱光等の反
射光をＯＴＤＲ２により検出し、その減衰量と減衰位置
等から光伝送路１の損傷、破断等の状況を監視するもの
であった。この場合、主光信号の波長が１．３μｍ帯域
の場合は監視光信号に１．５５μｍ帯域を使用するなど
して両者に全く異なる波長帯域の信号を使用していた。2. Description of the Related Art Monitoring of damage, disconnection, etc. of an optical fiber (optical transmission line) for image transmission has been conventionally performed.
In the conventional monitoring method, as shown in FIG. 2, the image signal (main optical signal) from the main signal system is passed through the optical coupler 3 to the optical transmission line 1 and the
A monitoring optical signal is transmitted from the TDR system through the optical coupler 3, reflected light such as Rayleigh scattered light of the monitoring optical signal from the optical transmission line 1 is detected by the OTDR 2, and the optical transmission line 1 is detected from the attenuation amount and the attenuation position. It was intended to monitor the damage, breakage, etc. In this case, if the wavelength of the main optical signal is in the 1.3 μm band, the signal in the completely different wavelength band is used for both such as using the 1.55 μm band for the monitoring optical signal.
【０００３】[0003]
【発明が解決しようとする課題】従来のように主光信号
に１．３μｍ帯域を、監視光信号に１．５５μｍ帯域を
使用すると、主光信号として１．３μｍ帯域と１．５５
μｍ帯域を使用し、それらを波長多重により伝送する場
合、ＯＴＤＲにより光伝送路を観測することができず、
光伝送路１の保守ができないという問題があった。If the 1.3 .mu.m band is used for the main optical signal and the 1.55 .mu.m band is used for the monitoring optical signal as in the prior art, the 1.3 .mu.m band and 1.55 .mu.m are used as the main optical signal.
When using the μm band and transmitting them by wavelength multiplexing, the optical transmission line cannot be observed by OTDR,
There is a problem that the optical transmission line 1 cannot be maintained.
【０００４】前記問題を解決するためには、光伝送路１
に主信号系と同一波長帯域の監視光信号を伝送すること
が考えられるが、その様にすると同一波長帯域の光の干
渉によるビート雑音が発生することがある。To solve the above problem, the optical transmission line 1
It is conceivable to transmit a supervisory optical signal in the same wavelength band as the main signal system, but doing so may cause beat noise due to interference of light in the same wavelength band.
【０００５】本発明の目的は光伝送路の監視方法におい
て、主光信号と監視光信号に同一波長帯域の光を使用し
ても、ビート雑音が発生しないようにすることにある。An object of the present invention is to prevent beat noise from occurring in a method of monitoring an optical transmission line even if light of the same wavelength band is used for the main optical signal and the monitoring optical signal.
【０００６】[0006]
【課題を解決するための手段】本発明のうち請求項１の
光伝送路の監視方法は、図１の様に主信号系からの主光
信号を伝送する光伝送路１に、ＯＴＤＲ系から主光信号
と同一波長帯域である監視光信号を伝送し、光伝送路１
からの監視光信号の反射光に基づいてＯＴＤＲ２により
光伝送路１の状況を監視するようにした光伝送路の監視
方法において、前記の両光信号の干渉状態を確認し、干
渉のビート波形が主信号系の波長帯域内にあるときはＯ
ＴＤＲ系の光源の温度を変化させるようにした方法であ
る。According to a first aspect of the present invention, there is provided an optical transmission line monitoring method comprising: an optical transmission line 1 for transmitting a main optical signal from a main signal system, and an OTDR system, as shown in FIG. An optical transmission line 1 that transmits a monitoring optical signal in the same wavelength band as the main optical signal
In the optical transmission line monitoring method in which the state of the optical transmission line 1 is monitored by the OTDR 2 based on the reflected light of the monitoring optical signal from the above, the interference state of the both optical signals is confirmed, and the beat waveform of the interference is confirmed. O when in the wavelength band of the main signal system
This is a method in which the temperature of the TDR light source is changed.
【０００７】本発明のうち請求項２の光伝送路の監視方
法は、図１の様に主信号系からの主光信号を光カプラ３
を通して伝送する光伝送路１に、ＯＴＤＲ系から同光カ
プラ３を通して主光信号と同一波長帯域の監視光信号を
伝送し、光伝送路１からの監視光信号の反射光に基づい
てＯＴＤＲ２により光伝送路１の状況を監視するように
した光伝送路の監視方法において、光カプラ３の第二ポ
ート４において前記の主光信号と監視光信号の干渉状態
を確認し、干渉のビート波形が主信号系の波長帯域内に
あるときはＯＴＤＲ系の光源の温度を変化させるように
した方法である。In the method of monitoring an optical transmission line according to a second aspect of the present invention, the main optical signal from the main signal system as shown in FIG.
A supervisory optical signal in the same wavelength band as the main optical signal is transmitted from the OTDR system through the same optical coupler 3 to the optical transmission line 1 that is transmitted through the optical transmission line 1, and is transmitted by the OTDR 2 based on the reflected light of the supervisory optical signal from the optical transmission line 1. In an optical transmission line monitoring method for monitoring the state of the transmission line 1, the interference state between the main optical signal and the monitoring optical signal is confirmed at the second port 4 of the optical coupler 3, and the beat waveform of the interference is mainly detected. This is a method in which the temperature of the light source of the OTDR system is changed when it is within the wavelength band of the signal system.
【０００８】[0008]
【作用】本発明のうち請求項１、２の光伝送路の監視方
法では、主光信号と監視光信号とに同一波長帯域を使用
し、干渉のビート波形が主信号系の帯域内にあるときは
ＯＴＤＲ系の光源の温度を変化させるので、その温度変
化に応じて同光源から発光される光の波長帯域が変化
し、主光信号と監視光信号との干渉によるビートが主光
信号の波長帯域内から除去される。従って、映像信号に
影響なく光伝送路を監視することができる。According to the optical transmission line monitoring method of the present invention, the same wavelength band is used for the main optical signal and the monitoring optical signal, and the interference beat waveform is within the band of the main signal system. Since the temperature of the light source of the OTDR system is changed at this time, the wavelength band of the light emitted from the light source changes according to the temperature change, and the beat due to the interference between the main optical signal and the monitoring optical signal It is removed from within the wavelength band. Therefore, the optical transmission line can be monitored without affecting the video signal.
【０００９】[0009]
【実施例】本発明の光伝送路の監視方法に使用される測
定装置の一例を図１に示す。この測定装置は光ファイバ
を用いた主信号系の光伝送路１に光カプラ３を設置し、
その第一ポートに光ファイバによる主信号系を、第二ポ
ートにＯＴＤＲ２系と、ＯＴＤＲ系の光源からの監視光
信号と主信号系の光源からの主光信号との干渉状態を測
定するＯＥ変換器６を設置してある。FIG. 1 shows an example of a measuring apparatus used in the method for monitoring an optical transmission line of the present invention. This measuring device has an optical coupler 3 installed in an optical transmission line 1 of a main signal system using an optical fiber,
OE conversion for measuring the interference state between the main signal system by the optical fiber at the first port and the OTDR2 system at the second port and the monitoring optical signal from the light source of the OTDR system and the main optical signal from the light source of the main signal system A vessel 6 is installed.
【００１０】そして本発明では図１の主光信号系の光源
からの主光信号を光カプラ３を通して光伝送路１に伝送
し、ＯＴＤＲ系の光源（例えばＬＤ）からの監視光信号
を同光伝送路１に光カプラ３を通して伝送し、光伝送路
１からの監視光信号の反射光に基づいてＯＴＤＲ２によ
り光伝送路１の状況を監視する。この場合、主光信号及
び監視光信号として同じ波長帯或の信号、例えば１．３
μｍ帯或は１．５５μｍ帯域の光を使用する。In the present invention, the main optical signal from the light source of the main optical signal system shown in FIG. 1 is transmitted to the optical transmission line 1 through the optical coupler 3, and the monitoring optical signal from the light source of the OTDR system (for example, LD) is transmitted. The state of the optical transmission line 1 is monitored by the OTDR 2 based on the reflected light of the monitoring optical signal transmitted from the optical transmission line 1 through the optical coupler 3 to the transmission line 1. In this case, signals having the same wavelength band as the main optical signal and the monitoring optical signal, for example, 1.3
Light in the μm band or 1.55 μm band is used.
【００１１】そして本発明では図１の光カプラ３の第二
ポートに接続したＯＥ変換器６により監視光信号と主光
信号の干渉状態を測定して確認する。このとき、主信号
系の波長帯域内に干渉のビート波形があればＯＴＤＲ系
の光源の温度を数℃（１〜２℃程度）変化させて監視光
信号の波長帯域を変化させ、２波長の干渉による光のビ
ート雑音を主信号系の波長帯域内から除去させる。In the present invention, the interference state between the supervisory optical signal and the main optical signal is measured and confirmed by the OE converter 6 connected to the second port of the optical coupler 3 shown in FIG. At this time, if there is an interference beat waveform in the wavelength band of the main signal system, the temperature band of the OTDR system light source is changed by several degrees Celsius (about 1 to 2 degrees Celsius) to change the wavelength band of the monitoring optical signal to change the wavelength band of two wavelengths. Optical beat noise due to interference is removed from within the wavelength band of the main signal system.
【００１２】ちなみに、２ＧＨZ 内にビート雑音が発生
するためには２波長が０．０２ｎｍ以内に近づかなくて
はならず、光源の温度による波長変化は０．１ｎｍ／℃
である。このため１℃以上温度を変えれば容易にビート
雑音を波長帯域内から除去することができる。[0012] Incidentally, 2GH 2 wavelengths to beat noise is generated in Z is not is not approach within 0.02 nm, the wavelength change due to the temperature of the light source is 0.1 nm / ° C.
Is. Therefore, beat noise can be easily removed from the wavelength band by changing the temperature by 1 ° C. or more.
【００１３】主光信号及び監視光信号として例えば１．
３μｍ帯域或は１．５５μｍ帯域の光が使用されている
場合、前記の温度変化に伴う帯域変化により厳密には監
視光信号の波長帯域も変化するが、前記の１．３μｍ帯
域或は１．５５μｍ帯域には±２０ｎｍ程度の帯域幅が
あるため、温度変化に伴う監視光信号の帯域変化はその
波長帯域幅内に収まる。このため、温度変化により監視
光信号の帯域が変化しても監視光信号の波長帯域は主光
信号の波長帯域と同一帯域内に収まる。As the main optical signal and the monitoring optical signal, for example, 1.
When light in the 3 μm band or the 1.55 μm band is used, the wavelength band of the monitoring optical signal strictly changes due to the band change due to the temperature change, but the 1.3 μm band or 1. Since the 55 μm band has a bandwidth of about ± 20 nm, the band change of the monitoring optical signal due to the temperature change falls within the wavelength band. Therefore, even if the band of the monitoring optical signal changes due to the temperature change, the wavelength band of the monitoring optical signal falls within the same band as the wavelength band of the main optical signal.
【００１４】[0014]
【発明の効果】本発明の光伝送路の監視方法によれば次
の様な効果がある。 ．主光信号と監視光信号に同じ波長帯域の光信号を使
用してもビートの影響を受けないので、画像信号等の主
光信号に影響なく光伝送路を監視することができる。 ．主光信号と監視光信号に同じ波長帯域の信号を使用
するので、例えば１．３μｍ帯と１．５５μｍ帯域のい
ずれか一方の信号を波長多重に使用し、他方の帯域の信
号を監視光信号に使用してＯＴＤＲ測定することができ
る。The optical transmission line monitoring method of the present invention has the following effects. ． Even if optical signals in the same wavelength band are used for the main optical signal and the monitoring optical signal, the influence of the beat is not exerted, so that the optical transmission line can be monitored without affecting the main optical signal such as the image signal. ． Since signals of the same wavelength band are used for the main optical signal and the supervisory optical signal, for example, either one of the 1.3 μm band and the 1.55 μm band is used for wavelength multiplexing, and the signal of the other band is used as the supervisory optical signal. Can be used for OTDR measurement.
【図１】本発明の光伝送路の監視方法に使用される測定
装置の一例を示す説明図。FIG. 1 is an explanatory diagram showing an example of a measuring device used in a method for monitoring an optical transmission line of the present invention.
【図２】従来の光伝送路の監視方法に使用される測定装
置の一例を示す説明図。FIG. 2 is an explanatory diagram showing an example of a measuring device used in a conventional method of monitoring an optical transmission line.
１ 光伝送路 ２ ＯＴＤＲ ３ 光カプラ ４ 第二ポート 1 Optical transmission path 2 OTDR 3 Optical coupler 4 Second port
Claims (2)
送路（１）に、ＯＴＤＲ系から主光信号と同一波長帯域
である監視光信号を伝送し、光伝送路（１）からの監視
光信号の反射光に基づいてＯＴＤＲ（２）により光伝送
路（１）の状況を監視するようにした光伝送路の監視方
法において、前記の両光信号の干渉状態を確認し、干渉
のビート波形が主信号系の波長帯域内にあるときはＯＴ
ＤＲ系の光源の温度を変化させるようにしたことを特長
とする光伝送路の監視方法。1. An optical transmission line (1) for transmitting a main optical signal from a main signal system, wherein a monitoring optical signal in the same wavelength band as the main optical signal is transmitted from the OTDR system, and the optical transmission line (1) is transmitted. In the method of monitoring the optical transmission line (1) based on the reflected light of the monitoring optical signal, the state of the optical transmission line (1) is monitored by the OTDR (2). When the beat waveform of is within the wavelength band of the main signal system, OT
A method for monitoring an optical transmission line, characterized in that the temperature of a DR light source is changed.
（３）を通して伝送する光伝送路（１）に、ＯＴＤＲ系
から同光カプラ（３）を通して主光信号と同一波長帯域
の監視光信号を伝送し、光伝送路（１）からの監視光信
号の反射光に基づいてＯＴＤＲ（２）により光伝送路
（１）の状況を監視するようにした光伝送路の監視方法
において、光カプラ（３）の第二ポート（４）において
前記の主光信号と監視光信号の干渉状態を確認し、干渉
のビート波形が主信号系の波長帯域内にあるときはＯＴ
ＤＲ系の光源の温度を変化させるようにしたことを特長
とする光伝送路の監視方法。2. A monitoring light in the same wavelength band as the main optical signal from the OTDR system through the optical coupler (3) to the optical transmission line (1) for transmitting the main optical signal from the main signal system through the optical coupler (3). An optical transmission line monitoring method for transmitting a signal and monitoring the state of the optical transmission line (1) by an OTDR (2) based on reflected light of a monitoring optical signal from the optical transmission line (1) The interference state between the main optical signal and the supervisory optical signal is confirmed at the second port (4) of the coupler (3), and when the beat waveform of the interference is within the wavelength band of the main signal system, the OT
A method for monitoring an optical transmission line, characterized in that the temperature of a DR light source is changed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5249995A JPH0787020A (en) | 1993-09-10 | 1993-09-10 | Monitoring method for optical transmission line |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5249995A JPH0787020A (en) | 1993-09-10 | 1993-09-10 | Monitoring method for optical transmission line |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0787020A true JPH0787020A (en) | 1995-03-31 |
Family
ID=17201280
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5249995A Pending JPH0787020A (en) | 1993-09-10 | 1993-09-10 | Monitoring method for optical transmission line |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0787020A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2015089082A (en) * | 2013-11-01 | 2015-05-07 | ミハル通信株式会社 | Broadcast system and center device |
| CN105981312A (en) * | 2014-12-12 | 2016-09-28 | 华为技术有限公司 | Passive Optical Network apparatus |
-
1993
- 1993-09-10 JP JP5249995A patent/JPH0787020A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2015089082A (en) * | 2013-11-01 | 2015-05-07 | ミハル通信株式会社 | Broadcast system and center device |
| CN105981312A (en) * | 2014-12-12 | 2016-09-28 | 华为技术有限公司 | Passive Optical Network apparatus |
| CN105981312B (en) * | 2014-12-12 | 2019-06-14 | 华为技术有限公司 | A kind of passive optical network equipment |
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