JP2721211B2 - Branch optical line loss distribution measurement device - Google Patents
Branch optical line loss distribution measurement deviceInfo
- Publication number
- JP2721211B2 JP2721211B2 JP63297044A JP29704488A JP2721211B2 JP 2721211 B2 JP2721211 B2 JP 2721211B2 JP 63297044 A JP63297044 A JP 63297044A JP 29704488 A JP29704488 A JP 29704488A JP 2721211 B2 JP2721211 B2 JP 2721211B2
- Authority
- JP
- Japan
- Prior art keywords
- optical
- light
- wavelength
- branch
- loss distribution
- 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
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
- G01M11/30—Testing of optical devices, constituted by fibre optics or optical waveguides
- G01M11/31—Testing of optical devices, constituted by fibre optics or optical waveguides with a light emitter and a light receiver being disposed at the same side of a fibre or waveguide end-face, e.g. reflectometers
- G01M11/3109—Reflectometers detecting the back-scattered light in the time-domain, e.g. OTDR
Description
【発明の詳細な説明】 （産業上の利用分野） 本発明は一端が複数本の光分岐路に分岐されている分
岐光線路の長手方向の損失分布をデータ伝送中に各光分
岐路毎に個別に測定できるようにした、光分岐線路の損
失分布測定装置に関するものである。DETAILED DESCRIPTION OF THE INVENTION (Industrial application field) The present invention provides a method for determining a longitudinal loss distribution of a branch optical line having one end branched into a plurality of optical branch lines for each optical branch line during data transmission. The present invention relates to a loss distribution measuring device for an optical branch line, which can be individually measured.
（従来の技術） 光ファイバ線路の長手方向の損失分布の測定には、従
来のOTDR（optical time domain reflectometer）が使
用されている。(Prior Art) A conventional OTDR (optical time domain reflectometer) is used to measure the loss distribution in the longitudinal direction of an optical fiber line.
OTDRは第７図の光ファイバＡ内を進行する光（第７図
の矢印ａ）が、光ファイバＡの損失によって散乱されて
第７図の矢印ｂで示すように戻ってくる成分（後方散乱
光）を、走行時間の関数として測定するものである。The OTDR is a component (backscattering) that the light traveling in the optical fiber A in FIG. 7 (arrow a in FIG. 7) is scattered by the loss of the optical fiber A and returns as shown by arrow b in FIG. Light) as a function of travel time.
後方散乱光の強度は光ファイバの長手方向にある光パ
ワーに比例し、走行時間もその位置までの距離Ｌに比例
するので、パワーの長手方向の分布はlog表示すると第
８図のようになる。第８図のΔα（パワーの段差）は接
続損失である。The intensity of the backscattered light is proportional to the optical power in the longitudinal direction of the optical fiber, and the traveling time is also proportional to the distance L to the position. Therefore, the logarithmic distribution of the power is as shown in FIG. . In FIG. 8, Δα (power step) is connection loss.
（発明が解決しようとする課題） 近年は光加入者系のネットワーク構造として、第９図
のように光線路Ｂの分岐部Ｃより先が複数本の光ファイ
バ（光分岐路）D1、D2・・・Dnに分岐された分岐光線路
が提案されている。この分岐光線路に従来からのOTDRを
そのまま使用すると、総ての光分岐路D1、D2・・・Dnか
らの後方散乱光が集合されてOTDRに受信されるので、個
々の光分岐路D1、D2・・・Dnの損失分布を個別に測定す
ることができないという問題があった。(Problems to be Solved by the Invention) In recent years, as a network structure of an optical subscriber system, a plurality of optical fibers (optical branch paths) D 1 , D ahead of a branch portion C of an optical line B as shown in FIG. 2 · · · D n to branched branch optical have been proposed. When used as an OTDR from conventionally the branch optical network, since the backscattered light from all the optical branching path D 1, D 2 ··· D n are received by the OTDR is set, individual light branching There is a problem that the loss distributions of the paths D 1 , D 2, ..., D n cannot be measured individually.
（発明の目的） 本発明の目的は、従来からのOTDRをそのまま使用し
て、損失分布の測定ができるようにした分岐光線路の損
失分布測定装置を提供することにある。(Object of the Invention) It is an object of the present invention to provide a branch optical line loss distribution measuring apparatus capable of measuring a loss distribution using a conventional OTDR as it is.
（問題点を解決するための手段） 本発明の分岐光線路の損失分布測定装置は、第１図の
ように一端が複数本の光分岐路11、12・・・1nに分岐さ
れている分岐光線路２のうち、分岐されていない方の一
端３に、異なる測定用の波長λ１、λ２・・・λｎのう
ち任意の一つの波長で発振可能な光源を持つOTDR4が接
続され、前記光分岐路11、12・・・1nの夫々に、前記波
長λ１、λ２・・・λｎのうちいずれか一つの波長の光
及び前記波長λ１、λ２・・・λｎと異なる波長λの通
信光は通過させるが、他の波長の光は阻止する光フィル
タ51、52・・・5nが配置されてなることを特徴とするも
のである。(Means for Solving the Problems) The loss distribution measuring apparatus for a branched optical line according to the present invention has one end branched into a plurality of optical branch paths 11 1 , 1 2 ... 1 n as shown in FIG. OTDR 4 having a light source capable of oscillating at any one of the different measurement wavelengths λ 1 , λ 2 ... Λ n is provided at one end 3 of the unbranched optical line 2. connected, the optical branch passage 1 1, 1 2 ··· 1 n to each of the wavelengths λ 1, λ 2 ··· λ light and the wavelength lambda 1 of any one of the wavelengths of the n, lambda 2 .. Are characterized by being provided with optical filters 5 1 , 5 2 ... 5 n that pass communication light having a wavelength λ different from λ n but block light of other wavelengths. .
（作用） 本発明の分岐光線路の損失分岐測定装置は、分波器で
はなく光フィルタを使用し、しかもその光フィルタは第
１図の分岐部６より先の光分岐路11、12・・・1nに、各
種波長λ１、λ２・・・λｎのうち一つの波長の光及び
前記波長λ１、λ２・・・λｎと異なる波長λの通信光
は通過させるが、他の波長の光は阻止するものであるた
め、OTDR4から発振される光の波長λ１、λ２・・・λ
ｎと、各フィルタ51、52・・・5nの波長と、各光分岐路
11、12・・・1nの波長とを対応させると、各ファイバ
11、12・・・1nの後方散乱光がOTDR4において波長毎に
識別されて個別に測定されると共に全ての光分岐路11、
12・・・1nに通信光を伝送することができる。即ち、光
通信中に損失分布測定を行なうことができる。(Operation) The loss branching measuring device for a branched optical line of the present invention uses an optical filter instead of a demultiplexer, and the optical filter is an optical branching line 1 1 , 1 2 before the branching unit 6 in FIG. ... to 1 n, various wavelengths λ 1, λ 2 ··· λ one light and the wavelength lambda 1 of the wavelength of the n, the communication light of wavelength lambda different from the lambda 2, ... lambda n is passing since the light of other wavelengths is to prevent, wavelength lambda 1 of the light oscillated from OTDR4, λ 2 ··· λ
n , the wavelength of each filter 5 1 , 5 2 ... 5 n , and each optical branch
Corresponding to 1 1 , 1 2 ... 1 n wavelengths, each fiber
1 1 , 1 2 ... 1 n of the backscattered light are identified and measured individually for each wavelength in the OTDR 4, and all the optical branches 1 1 ,
Communication light can be transmitted to 1 2 ... 1 n . That is, loss distribution measurement can be performed during optical communication.
（実施例） 第１図は本発明の分岐光線路の損失分布測定装置の一
実施例である。(Embodiment) FIG. 1 shows an embodiment of a branch optical line loss distribution measuring apparatus according to the present invention.
同図においてOTDR4は損失分布測定器であり、これは
個々の光分岐路11、12・・・1nの長手方向の後方散乱光
を、走行時間の関数として測定するものである。このOT
DR4は異なる波長λ１、λ２・・・λｎのうち任意の一
つの波長で発振可能な光源を持っている。この光源とし
ては第２図に示す様に、Ｎ個の光源71、72・・・7nから
必要とする波長の光を発生するものを光スイッチ８によ
って選択するようにしたものとか、波長の異なる光を発
生するＮ個の光源のうち一つだけに入力電力を供給する
ようにしたものとが、一つのLD（レーザダイオード）に
温度変化を与えて発振波長を操作するようにしたもの等
がある。FIG OTDR4 is loss distribution measuring apparatus in, which measures the respective optical branch passages 1 1, 1 longitudinal backscattered light 2 · · · 1 n, as a function of travel time. This OT
DR4 has the oscillation light source capable at any one wavelength among the different wavelengths λ 1, λ 2 ··· λ n . As shown in FIG. 2, a light source that generates light of a required wavelength from N light sources 7 1 , 7 2 ... 7 n is selected by an optical switch 8 as shown in FIG. The one that supplies input power to only one of the N light sources that generate light with different wavelengths controls the oscillation wavelength by giving a temperature change to one LD (laser diode). There are things.
第１図の１は光線路であり、これは分岐部６より先方
が複数本の光分岐路11、12・・・1nに分岐されている。1 of FIG. 1 is an optical path, which is other party from the branching section 6 is branched into a plurality of optical branching path 1 1, 1 2 · · · 1 n.
第１図の51、52・・・5nはフィルタであり、これは波
長λ１、λ２・・・λｎのうち一つの波長の光及び前記
波長λ１、λ２・・・λｎと異なる波長の通信光は通過
させ、他の波長の光は阻止するものである。このフィル
タとしては例えば誘電体多層膜フィルタが使用される。
また、本発明では光部品によりOTDR4による測定系と、
通信光を結合して損失分布測定時に光通信を行うことが
できるようにしてある。この場合、通信に使用する光の
波長をλし、同波長と前記波長との関係はλ≠λ１、λ
２・・・λｎとして、通信光がどの光分岐路11、12・・
・1nにも送信されるようにしてある。5 1 of FIG. 1, 5 2 · · · 5 n is a filter, which is the wavelength lambda 1, lambda 2 · · · lambda light and the wavelength lambda 1 of one wavelength of the n, lambda 2 · · · communication light of wavelength different from the lambda n is passed, light of other wavelengths is to prevent. As this filter, for example, a dielectric multilayer filter is used.
Further, in the present invention, a measurement system using OTDR4 by optical components,
Optical communication can be performed at the time of loss distribution measurement by coupling communication light. In this case, the wavelength of light used for communication is λ, and the relationship between the wavelength and the wavelength is λ ≠ λ 1 , λ
2 ... Λ n , which of the optical branch paths 11 1 , 12 2.
・ It is designed to be sent to 1 n as well.
第４図には1.3μｍ、1.55μｍの波長の光を夫々２等
分する溶融テーパ型の光分岐器９が示されている。この
光分岐器９は夫々の出力ポート9a,9bに1.3μｍの波長の
光は通過させるが、1.55μｍの波長の光は阻止するフィ
ルタ71、1.3μｍの波長の光は阻止するが1.55μｍの波
長の光は通過させるフィルタ72を埋め込んだものであ
る。FIG. 4 shows a fusion taper type optical splitter 9 for dividing light having wavelengths of 1.3 μm and 1.55 μm into two equal parts, respectively. The optical splitter 9 are each output port 9a, the light having a wavelength of 1.3μm can pass to 9b, a filter 7 1 light of a wavelength of 1.55μm is to block, the light having a wavelength of 1.3μm prevents 1.55μm the light wavelength in which embedded filter 7 2 passing.
この光分岐器９の損失分布を測定する場合はOTDR4と
して、第３図に示す様に1.3μｍの光を発生するLD10
1と、1.55μｍの光を発生するLD102を、スイッチ11の切
り替えにより選択して使用するものを利用する。なお第
３図の12はスイッチ切り替え駆動部、13は多機能ブロッ
クである。When measuring the loss distribution of the optical branching device 9, an LD 10 that generates 1.3 μm light as shown in FIG.
1, the LD 10 2 for generating light of 1.55 .mu.m, using those selected for use by switching of the switch 11. In FIG. 3, reference numeral 12 denotes a switch switching drive unit, and reference numeral 13 denotes a multifunctional block.
第３図のOTDR4を第５図のように分岐光線路２の一端
に接続して、同図の分岐部６の先の二本の光分岐路11、
12の損失分布を測定すると、第３図の1.3μｍのLD101を
選択したときのOTDR4のパワー表示は第６図の点線ａの
ようになり、1.55μｍのLD102を選択したときのOTDR4の
パワー表示は同図の実線ｂのようになる。ここで、分岐
光線路２のうち二本の光分岐路11、12に共通な分岐され
ていない部分のOTDR4のパワー表示は第６図の実線ｃの
ようになり、同図のΔα１、Δα２は夫々の波長に対応
する分岐の挿入損失である。The OTDR4 of Figure 3 connected to one end of the branched optical line 2 as in the fifth diagram, an optical branching path 1 1 previous two of the branch portions 6 of the drawing,
The measured 1 2 loss distribution, power display OTDR4 when selecting the LD 10 1 of 1.3μm in Figure 3 is as shown in dotted line a in FIG. 6, OTDR4 when selecting the LD 10 2 of 1.55μm Is indicated by a solid line b in FIG. Here, the power display of the OTDR 4 in the portion of the branch optical line 2 that is not branched and is common to the two optical branch paths 11 and 12 is as shown by a solid line c in FIG. 6, and Δα 1 in FIG. , Δα 2 are the insertion losses of the branches corresponding to the respective wavelengths.
（発明の効果） （１）本発明の分岐光線路の損失分布測定装置は、光分
岐路11、12・・・1n毎に光フィルタが挿入されているた
め、後方散乱光の波長λ１、λ２・・・λｎが光分岐路
11、12・・・1n毎に異なり、OTDRを用いて各光分岐線路
11、12・・・1nの損失分布を個別に測定することができ
る。Loss distribution measuring apparatus of branched optical lines (Effect of the Invention) (1) The present invention, since the optical branching path 1 1, 1 2 · · · 1 n optical filters each have been inserted, the wavelength of the backscattered light λ 1 , λ 2 ... λ n are optical branch paths
1 1 , 1 2 ... 1 n
1 1 , 1 2 ... 1 n loss distributions can be individually measured.
（２）光分波器ではなく光フィルタ51、52・・・5nを使
用するので、どの光分岐路11、12・・・1nにも通信光を
伝送するこができ、損失分布の測定と同時に光通信を行
うことができる。(2) because it uses optical filter 5 1, 5 2 · · · 5 n rather than optical demultiplexer, can this How optical branching path 1 1, to 1 2 · · · 1 n transmits communication light Optical communication can be performed simultaneously with the measurement of the loss distribution.
第１図は本発明の損失分布測定装置の一例を示す説明
図、第２図、第３図は本発明におけるOTDRの光源切り替
え部の異種説明図、第４図は本発明における光分岐器の
一例を示す説明図、第５図は第３図のOTDRを用いた損失
分布測定システムの説明図、第６図は第５図の測定シス
テムで測定された光パワーと距離との関係を示す説明
図、第７図は従来の損失分布測定システムの説明図、第
８図は第７図の測定システムで測定された光パワーと距
離との関係を示す説明図、第９図は光分岐線路の説明図
である。 11、12・・・1nは光分岐路 ２は分岐光線路 ３は分岐光線路の一端 λ１、λ２・・・λｎは波長 ４はOTDR 51、52・・・5nは光フィルタFIG. 1 is an explanatory view showing an example of a loss distribution measuring apparatus according to the present invention, FIGS. 2 and 3 are different explanatory views of a light source switching section of an OTDR according to the present invention, and FIG. FIG. 5 is an explanatory view showing an example, FIG. 5 is an explanatory view of a loss distribution measuring system using the OTDR of FIG. 3, and FIG. 6 is an explanatory view showing a relationship between optical power and distance measured by the measuring system of FIG. FIG. 7, FIG. 7 is an explanatory diagram of a conventional loss distribution measuring system, FIG. 8 is an explanatory diagram showing the relationship between optical power and distance measured by the measuring system of FIG. 7, and FIG. FIG. 1 1 , 1 2 ... 1 n are optical branch lines 2 are branch optical lines 3 are one ends of branch optical lines λ 1 , λ 2 ... Λ n are wavelengths 4 are OTDRs 5 1 , 5 2. n is the optical filter
Claims (1)
分岐されている分岐光線路２のうち、分岐されていない
方の一端３に、異なる波長λ１、λ２・・・λｎのうち
任意の一つの波長で発振可能な光源を持つOTDR4が接続
され、前記分岐光線路２の光分岐路11、12・・・1nの夫
々に、前記波長λ１、λ２・・・λｎのうちいずれか一
つの波長の光及び前記波長λ１、λ２・・・λｎと異な
る波長λの通信光は通過させるが、他の波長の光は阻止
する光フィルタ51、52・・・5nが配置されてなることを
特徴とする分岐光線路の損失分布測定装置。An end of an unbranched optical line 2 having one end branched into a plurality of optical branch paths 11 1 , 1 2, ... 1 n has different wavelengths λ 1 , OTDR4 having an oscillation light source capable at any one wavelength among λ 2 ··· λ n is connected, said to optical branch path 1 1 of the branch optical 2, 1 2 · · · 1 n each, the wavelength λ 1, λ 2 ··· λ light and the wavelength lambda 1 of any one of the wavelengths of the n, the communication light of wavelength different from the λ 2 ··· λ n λ is passing, the other wavelengths of light Is a loss distribution measuring device for a branch optical line, wherein optical filters 5 1 , 5 2 ... 5 n for blocking are arranged.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63297044A JP2721211B2 (en) | 1988-11-24 | 1988-11-24 | Branch optical line loss distribution measurement device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63297044A JP2721211B2 (en) | 1988-11-24 | 1988-11-24 | Branch optical line loss distribution measurement device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02141641A JPH02141641A (en) | 1990-05-31 |
| JP2721211B2 true JP2721211B2 (en) | 1998-03-04 |
Family
ID=17841490
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63297044A Expired - Fee Related JP2721211B2 (en) | 1988-11-24 | 1988-11-24 | Branch optical line loss distribution measurement device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2721211B2 (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB9202564D0 (en) * | 1992-02-07 | 1992-03-25 | Marconi Gec Ltd | Optical signal transmission network |
| DE69333369T2 (en) * | 1992-05-01 | 2004-10-07 | Sumitomo Electric Industries | Optical line identification method |
| US5383015A (en) * | 1992-12-22 | 1995-01-17 | At&T Corp. | Optical time domain reflectometry measurements on a multi-branch optical network using multiwavelength pass filters |
| JP2924881B2 (en) * | 1997-01-27 | 1999-07-26 | 住友電気工業株式会社 | Tunable light source and OTDR device |
| JP3346233B2 (en) * | 1997-08-18 | 2002-11-18 | ケイディーディーアイ株式会社 | Optical transmission line monitoring device |
| BR9908176A (en) | 1998-02-23 | 2000-11-07 | Sumitomo Electric Industries | Extension line monitoring system and extension line monitoring method |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57132299A (en) * | 1981-02-09 | 1982-08-16 | Nippon Electric Co | Line concentrating optical fiber sensor |
-
1988
- 1988-11-24 JP JP63297044A patent/JP2721211B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH02141641A (en) | 1990-05-31 |
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