JPS6458137A - Optical signal transmission system - Google Patents

Optical signal transmission system

Info

Publication number
JPS6458137A
JPS6458137A JP21621287A JP21621287A JPS6458137A JP S6458137 A JPS6458137 A JP S6458137A JP 21621287 A JP21621287 A JP 21621287A JP 21621287 A JP21621287 A JP 21621287A JP S6458137 A JPS6458137 A JP S6458137A
Authority
JP
Japan
Prior art keywords
loopback
signal light
photodiode
terminal station
repeater
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
JP21621287A
Other languages
Japanese (ja)
Inventor
Kazuya Amagi
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.)
Fujitsu Ltd
Original Assignee
Fujitsu 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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP21621287A priority Critical patent/JPS6458137A/en
Publication of JPS6458137A publication Critical patent/JPS6458137A/en
Pending legal-status Critical Current

Links

Landscapes

  • Dc Digital Transmission (AREA)
  • Monitoring And Testing Of Transmission In General (AREA)
  • Optical Communication System (AREA)

Abstract

PURPOSE:To prevent a loop from being formed in an optical transmission line when loopback is operated by decreasing a feeding voltage level to a photoelectric conversion capability missing level or below in the 1st photodetector in response to an output signal when a loopback signal light is made incident in the 2nd photodetector. CONSTITUTION:In applying optical loopback from a terminal station A to an incoming side of a repeater Rep 2 to apply fault monitor as to the optical line between the terminal stations A, B, the loopback signal light is made incident in a photodiode 1222 of the repeater Rep2. The output signal from a photodiode 1222 is inputted to an equalizer 1622 together with an output signal of a photodiode 1022 receiving a main signal light from the terminal station B. A DC-DC converter 1422 reduces the DC voltage levelfed to the photodiode 1022. Thus, only the loopback signal light from the terminal station A is returned to the repeater Rep1 and the terminal station A. Thus, the loop for the loopback signal light is not formed in the optical line.
JP21621287A 1987-08-28 1987-08-28 Optical signal transmission system Pending JPS6458137A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP21621287A JPS6458137A (en) 1987-08-28 1987-08-28 Optical signal transmission system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP21621287A JPS6458137A (en) 1987-08-28 1987-08-28 Optical signal transmission system

Publications (1)

Publication Number Publication Date
JPS6458137A true JPS6458137A (en) 1989-03-06

Family

ID=16685033

Family Applications (1)

Application Number Title Priority Date Filing Date
JP21621287A Pending JPS6458137A (en) 1987-08-28 1987-08-28 Optical signal transmission system

Country Status (1)

Country Link
JP (1) JPS6458137A (en)

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