JPH0415042U - - Google Patents
Info
- Publication number
- JPH0415042U JPH0415042U JP5473390U JP5473390U JPH0415042U JP H0415042 U JPH0415042 U JP H0415042U JP 5473390 U JP5473390 U JP 5473390U JP 5473390 U JP5473390 U JP 5473390U JP H0415042 U JPH0415042 U JP H0415042U
- Authority
- JP
- Japan
- Prior art keywords
- light
- optical
- otdr
- optical fiber
- directional coupler
- 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
- 230000003287 optical effect Effects 0.000 claims description 7
- 238000000253 optical time-domain reflectometry Methods 0.000 claims description 4
- 239000013307 optical fiber Substances 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 5
- 230000003321 amplification Effects 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
Landscapes
- Testing Of Optical Devices Or Fibers (AREA)
Description
第１図はこの考案によるＯＴＤＲの構成図、第
２図は光学フイルタ９の光学特性図、第３図はこ
の考案による実施例の構成図、第４図は従来技術
によるＯＴＤＲの構成図、第５図は第４図で得ら
れる信号波形図、第６図は高速光スイツチを使用
した場合の第４図の増幅回路７の出力波形図、第
７図は後方散乱光のスペクトラム成分を表した図
である。
１……パルス発生器、２……光源駆動回路、３
……光源、４……方向性結合器、５……光フアイ
バ、６……受光素子、７……増幅回路、８……信
号処理回路、９……帯域制限用光学フイルタ、１
０……光切換回路。
FIG. 1 is a block diagram of an OTDR according to this invention, FIG. 2 is an optical characteristic diagram of an optical filter 9, FIG. 3 is a block diagram of an embodiment according to this invention, and FIG. 4 is a block diagram of an OTDR according to the prior art. Figure 5 shows the signal waveform obtained in Figure 4, Figure 6 shows the output waveform of the amplifier circuit 7 in Figure 4 when a high-speed optical switch is used, and Figure 7 shows the spectrum components of backscattered light. It is a diagram. 1...Pulse generator, 2...Light source drive circuit, 3
... Light source, 4 ... Directional coupler, 5 ... Optical fiber, 6 ... Light receiving element, 7 ... Amplification circuit, 8 ... Signal processing circuit, 9 ... Bandwidth limiting optical filter, 1
0...Optical switching circuit.
Claims (1)
て光フアイバ５に入射し、光フアイバ５からの後
方散乱光またはフレネル反射光を方向性結合器４
で分離し、受光素子６で光電変換し、信号処理回
路８で光フアイバ５の状態を検出するＯＴＤＲに
おいて、 光フアイバ５に入射した光パルスと同じ波長成
分を取り除く帯域制限用光学フイルタ９を方向性
結合器４と受光素子６の間に入れることを特徴と
するＯＴＤＲ。[Claims for Utility Model Registration] Light pulses from the light source 3 are input to the optical fiber 5 via the directional coupler 4, and backscattered light or Fresnel reflected light from the optical fiber 5 is transmitted to the directional coupler 4.
In the OTDR, which separates the optical pulse at The OTDR is characterized in that it is inserted between the optical coupler 4 and the light receiving element 6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5473390U JPH0415042U (en) | 1990-05-25 | 1990-05-25 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5473390U JPH0415042U (en) | 1990-05-25 | 1990-05-25 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0415042U true JPH0415042U (en) | 1992-02-06 |
Family
ID=31577060
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5473390U Pending JPH0415042U (en) | 1990-05-25 | 1990-05-25 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0415042U (en) |
-
1990
- 1990-05-25 JP JP5473390U patent/JPH0415042U/ja active Pending
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