JPS56103549A - Loop type optical communication system - Google Patents

Loop type optical communication system

Info

Publication number
JPS56103549A
JPS56103549A JP525680A JP525680A JPS56103549A JP S56103549 A JPS56103549 A JP S56103549A JP 525680 A JP525680 A JP 525680A JP 525680 A JP525680 A JP 525680A JP S56103549 A JPS56103549 A JP S56103549A
Authority
JP
Japan
Prior art keywords
wavelength
loop
optical
signal
station
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
JP525680A
Other languages
Japanese (ja)
Other versions
JPS6252973B2 (en
Inventor
Kazunori Iwasaki
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.)
Toshiba Corp
Original Assignee
Toshiba Corp
Tokyo Shibaura Electric Co 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 Toshiba Corp, Tokyo Shibaura Electric Co Ltd filed Critical Toshiba Corp
Priority to JP525680A priority Critical patent/JPS56103549A/en
Publication of JPS56103549A publication Critical patent/JPS56103549A/en
Publication of JPS6252973B2 publication Critical patent/JPS6252973B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/03—Arrangements for fault recovery
    • H04B10/035—Arrangements for fault recovery using loopbacks

Abstract

PURPOSE:To realize a low cost and high reliability, by transmitting two optical signals of different lengths on an optical fiber and in the opposite direction to each other and then returning the optical signal of a wavelength received at the both stations of the faulty area by the optical signal having the other wavelength. CONSTITUTION:Each station is composed of the optical couplers C1 and C2, transmitters T1 and T2, receivers R1 and R2, switches SW1-SW3 plus logic part L. In the normal time, the loop 40 of wavelength lambda1 is connected to the optical fiber cable 10 via C1 R1 L SW3 T1 C2, and the loop 50 of wavelength lambda2 is connected to the cable 10 in the order of C2 R2 L SW2 T2 C1, respectively. Thus in case the line fault 60 arises, the loop-back function of stations 20 and 30 adjacent to the faulty area works. In other words, the switch SW1 is closed, and the signal is returned at the station 20 in a route of C1 R1 L SW3 SW1 T2 C1. The signal is returned in the station 30 in a route of C2 R2 L SW2 SW1 T1 C2.
JP525680A 1980-01-22 1980-01-22 Loop type optical communication system Granted JPS56103549A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP525680A JPS56103549A (en) 1980-01-22 1980-01-22 Loop type optical communication system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP525680A JPS56103549A (en) 1980-01-22 1980-01-22 Loop type optical communication system

Publications (2)

Publication Number Publication Date
JPS56103549A true JPS56103549A (en) 1981-08-18
JPS6252973B2 JPS6252973B2 (en) 1987-11-09

Family

ID=11606135

Family Applications (1)

Application Number Title Priority Date Filing Date
JP525680A Granted JPS56103549A (en) 1980-01-22 1980-01-22 Loop type optical communication system

Country Status (1)

Country Link
JP (1) JPS56103549A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57111147A (en) * 1980-12-26 1982-07-10 Fujitsu Ltd Station to be supervised, having folding function in optical loop transmission network
US5223967A (en) * 1986-06-11 1993-06-29 Mcdonnell Douglas Corporation Secure communications system
US5422772A (en) * 1989-08-28 1995-06-06 Mcdonnell Douglas Corporation Secure fiber optic networks

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57111147A (en) * 1980-12-26 1982-07-10 Fujitsu Ltd Station to be supervised, having folding function in optical loop transmission network
US5223967A (en) * 1986-06-11 1993-06-29 Mcdonnell Douglas Corporation Secure communications system
US5422772A (en) * 1989-08-28 1995-06-06 Mcdonnell Douglas Corporation Secure fiber optic networks

Also Published As

Publication number Publication date
JPS6252973B2 (en) 1987-11-09

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