JPS56100538A - Optical repeater monitoring system - Google Patents

Optical repeater monitoring system

Info

Publication number
JPS56100538A
JPS56100538A JP255980A JP255980A JPS56100538A JP S56100538 A JPS56100538 A JP S56100538A JP 255980 A JP255980 A JP 255980A JP 255980 A JP255980 A JP 255980A JP S56100538 A JPS56100538 A JP S56100538A
Authority
JP
Japan
Prior art keywords
frequencies
control
filter
frequency
higher harmonic
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
Application number
JP255980A
Other languages
Japanese (ja)
Inventor
Hiroharu Wakabayashi
Yasuhiko Niino
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.)
KDDI Corp
Original Assignee
Kokusai Denshin Denwa KK
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 Kokusai Denshin Denwa KK filed Critical Kokusai Denshin Denwa KK
Priority to JP255980A priority Critical patent/JPS56100538A/en
Publication of JPS56100538A publication Critical patent/JPS56100538A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/40—Monitoring; Testing of relay systems
    • H04B17/401—Monitoring; Testing of relay systems with selective localization
    • H04B17/402—Monitoring; Testing of relay systems with selective localization using different frequencies
    • H04B17/404—Monitoring; Testing of relay systems with selective localization using different frequencies selected by local filters

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Monitoring And Testing Of Transmission In General (AREA)
  • Optical Communication System (AREA)

Abstract

PURPOSE:To obtain the number of control signal frequencies required for the system, by causing each optical repeater to operate the photoswitch by the higher harmonic of the control frequency to constitute an optical folding circuit. CONSTITUTION:Control frequencies (f1-fn) of repeaters generate higher harmonic components respectively. If frequency f1 is set to 500kHz, secondary higher harmonic frequency 28 is 1MHz. The fractional band on the array of frequencies 28- 31 is 1.7X10<-3> which is equal to that of control frequencies 23-26 assigned to respective repeaters. The operating band of the crystal filter is approximately 1MHz or more, and approximately 10<-3> is expected as the fractioal band in this filter. Consequently, secondary higher harmonics 28-31 of control frequencies can be received selectively by the crystal filter by substituting the filter with the crystal filter. Consequently, assignment of the required number of control frequencies is secured stably and surely for a long time.
JP255980A 1980-01-16 1980-01-16 Optical repeater monitoring system Pending JPS56100538A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP255980A JPS56100538A (en) 1980-01-16 1980-01-16 Optical repeater monitoring system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP255980A JPS56100538A (en) 1980-01-16 1980-01-16 Optical repeater monitoring system

Publications (1)

Publication Number Publication Date
JPS56100538A true JPS56100538A (en) 1981-08-12

Family

ID=11532726

Family Applications (1)

Application Number Title Priority Date Filing Date
JP255980A Pending JPS56100538A (en) 1980-01-16 1980-01-16 Optical repeater monitoring system

Country Status (1)

Country Link
JP (1) JPS56100538A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1983004150A1 (en) * 1982-05-06 1983-11-24 Nippon Telegraph And Telephone Public Corporation Method and device for separating position of fault in light transmission line

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1983004150A1 (en) * 1982-05-06 1983-11-24 Nippon Telegraph And Telephone Public Corporation Method and device for separating position of fault in light transmission line

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