JPS5461558A - Measurement of frequency characteristics of optical fiber cable - Google Patents

Measurement of frequency characteristics of optical fiber cable

Info

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
Application number
JP12825777A
Other languages
Japanese (ja)
Other versions
JPS592336B2 (en
Inventor
Masamitsu Tokuda
Hideyuki Takimoto
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nippon Telegraph and Telephone Corp
Sumitomo Electric Industries Ltd
Original Assignee
Nippon Telegraph and Telephone Corp
Sumitomo Electric Industries Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Nippon Telegraph and Telephone Corp, Sumitomo Electric Industries Ltd filed Critical Nippon Telegraph and Telephone Corp
Priority to JP12825777A priority Critical patent/JPS592336B2/en
Publication of JPS5461558A publication Critical patent/JPS5461558A/en
Publication of JPS592336B2 publication Critical patent/JPS592336B2/en
Expired legal-status Critical Current

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
JP12825777A 1977-10-25 1977-10-25 Method for measuring frequency characteristics of optical fiber cables Expired JPS592336B2 (en)

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)

* Cited by examiner, † Cited by third party
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

Also Published As

Publication number Publication date
JPS592336B2 (en) 1984-01-18

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