JPS54113351A - Measurement of transmission loss of optical fibers - Google Patents
Measurement of transmission loss of optical fibersInfo
- Publication number
- JPS54113351A JPS54113351A JP2066878A JP2066878A JPS54113351A JP S54113351 A JPS54113351 A JP S54113351A JP 2066878 A JP2066878 A JP 2066878A JP 2066878 A JP2066878 A JP 2066878A JP S54113351 A JPS54113351 A JP S54113351A
- Authority
- JP
- Japan
- Prior art keywords
- output
- optical
- detector
- fiber
- measured
- 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
Landscapes
- Testing Of Optical Devices Or Fibers (AREA)
Abstract
PURPOSE: To make it possible to measure the loss easily and highly accurately at the measuring site by detecting at the incident end the intensity of optical pulses which have transmitted back and forth through an optical fiber to be measured.
CONSTITUTION: A measuring light source 1 is subjected to pulse modulation by a pulse generator 2, and the resultant optical pulse train is divided into two by an optical branching circuit 3. One of the pulse trains divided enters a fiber 5 to be measured and is reflected at a total reflection terminal device 7 so that it is guided into an optical signal detector 8 after it has transmitted back and forth in the optical fiber 5. The other pulse train is guided as reference signals into an optical detector for the reference signals. The output of the detector 4 is converted into a DC output by a synchronous detecting circuit 9, whereas the output of the detector 8 is converted through a gate circuit 10 into a DC output by asynchronous detecting circuit 10. The DC output 12 of the reference signals is compared with the DC output 13 of the signals having reciprocated once through the fiber 5 by means of a comparator circuit 4 so that the desired loss can be measured.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2066878A JPS54113351A (en) | 1978-02-23 | 1978-02-23 | Measurement of transmission loss of optical fibers |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2066878A JPS54113351A (en) | 1978-02-23 | 1978-02-23 | Measurement of transmission loss of optical fibers |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS54113351A true JPS54113351A (en) | 1979-09-04 |
Family
ID=12033571
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2066878A Pending JPS54113351A (en) | 1978-02-23 | 1978-02-23 | Measurement of transmission loss of optical fibers |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS54113351A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5773633A (en) * | 1980-10-27 | 1982-05-08 | Nippon Telegr & Teleph Corp <Ntt> | Light pulse testing device |
| US5187362A (en) * | 1988-12-06 | 1993-02-16 | British Telecommunications Public Limited Company | Loss detection in a branched optical fiber |
-
1978
- 1978-02-23 JP JP2066878A patent/JPS54113351A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5773633A (en) * | 1980-10-27 | 1982-05-08 | Nippon Telegr & Teleph Corp <Ntt> | Light pulse testing device |
| JPH0130097B2 (en) * | 1980-10-27 | 1989-06-16 | Nippon Telegraph & Telephone | |
| US5187362A (en) * | 1988-12-06 | 1993-02-16 | British Telecommunications Public Limited Company | Loss detection in a branched optical fiber |
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