JPS5461558A - Measurement of frequency characteristics of optical fiber cable - Google Patents
Measurement of frequency characteristics of optical fiber cableInfo
- Publication number
- JPS5461558A JPS5461558A JP12825777A JP12825777A JPS5461558A JP S5461558 A JPS5461558 A JP S5461558A JP 12825777 A JP12825777 A JP 12825777A JP 12825777 A JP12825777 A JP 12825777A JP S5461558 A JPS5461558 A JP S5461558A
- Authority
- JP
- Japan
- Prior art keywords
- frequency
- modulated
- signals
- lights
- frequency characteristics
- 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.)
- Granted
Links
Landscapes
- Testing Of Optical Devices Or Fibers (AREA)
- Light Guides In General And Applications Therefor (AREA)
Abstract
PURPOSE: To measure the frequency characteristics without the use of local oscillatory signals by transmitting two optical intensity modulated lights of constant modulated frequency difference.
CONSTITUTION: The modulated signals of frequency f, which are generated by a signal generator 1, are subjected to frequency conversion by a frequency converter 5 so that the modulated signal frequency f is varied to generate modulated signals of frequency f+Δf having the difference Δf always constant. The two modulated lights from light sources 3 and 6, which have their intensities modulated in accordance with those two modulated signals, enter an optical fiber 10 through their respective beam splitters so that the emanating lights are converted into electric signls by an optical detector 11. The resultant photocurrent is squarely detected by a mixer 13 so that only the fundamental frequency component is detected by a narrow band filter 14 having a passable center frequency of f and a band width less than 2Δf. As a result, the local oscillatory signals for synchronous detection can be dispensed with. As a result, the measurement of the frequency characteristics can be accomplished easily and reliably without providing any coaxial cable for transmission of the local oscillatory signals
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP12825777A JPS592336B2 (en) | 1977-10-25 | 1977-10-25 | Method for measuring frequency characteristics of optical fiber cables |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP12825777A JPS592336B2 (en) | 1977-10-25 | 1977-10-25 | Method for measuring frequency characteristics of optical fiber cables |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5461558A true JPS5461558A (en) | 1979-05-17 |
JPS592336B2 JPS592336B2 (en) | 1984-01-18 |
Family
ID=14980371
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP12825777A Expired JPS592336B2 (en) | 1977-10-25 | 1977-10-25 | Method for measuring frequency characteristics of optical fiber cables |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS592336B2 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS60182052U (en) * | 1984-05-14 | 1985-12-03 | 大衛株式会社 | Patties for absorbing overflowing milk |
JPS61142816U (en) * | 1985-02-21 | 1986-09-03 |
-
1977
- 1977-10-25 JP JP12825777A patent/JPS592336B2/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
JPS592336B2 (en) | 1984-01-18 |
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