JPS55130246A - Optical loop-back system - Google Patents

Optical loop-back system

Info

Publication number
JPS55130246A
JPS55130246A JP3790679A JP3790679A JPS55130246A JP S55130246 A JPS55130246 A JP S55130246A JP 3790679 A JP3790679 A JP 3790679A JP 3790679 A JP3790679 A JP 3790679A JP S55130246 A JPS55130246 A JP S55130246A
Authority
JP
Japan
Prior art keywords
optical
electric
fiber
converter
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.)
Pending
Application number
JP3790679A
Other languages
Japanese (ja)
Inventor
Satoshi Ikeuchi
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 JP3790679A priority Critical patent/JPS55130246A/en
Publication of JPS55130246A publication Critical patent/JPS55130246A/en
Pending 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 ensure the quick detection of the faulty area by returning via the control signal from outside the electric-optical converter output of the two stations or the intermediate repeater station to the optical-electric converter of the self- station via the optical variable attenuator. CONSTITUTION:The signal to be sent to station C from station A reaches optical loop-back device 4 through electric- optical converter 1a and fiber 3a and then supplied to optical-electric converter 2a through fiber 3b. In case some fault occurs, the remote control is given to unit 4 via the control signal in order to shift mirrors 7a and 7b toward the arrows (positions of 7c and 7d), and then the light from electric- optical converter 1b is returned and received through the route of fiber 3d mirror 7d optical attenuator 6 mirror 7c fiber 3b to be then compared with the prescribed value. Thus the decision can be given quickly to the fault of the corresponding loop-back transmission system or other transmission systems.
JP3790679A 1979-03-30 1979-03-30 Optical loop-back system Pending JPS55130246A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3790679A JPS55130246A (en) 1979-03-30 1979-03-30 Optical loop-back system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3790679A JPS55130246A (en) 1979-03-30 1979-03-30 Optical loop-back system

Publications (1)

Publication Number Publication Date
JPS55130246A true JPS55130246A (en) 1980-10-08

Family

ID=12510577

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3790679A Pending JPS55130246A (en) 1979-03-30 1979-03-30 Optical loop-back system

Country Status (1)

Country Link
JP (1) JPS55130246A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60167534A (en) * 1984-02-10 1985-08-30 Fujitsu Ltd Light branching photoelectric transducer
US5825515A (en) * 1991-09-03 1998-10-20 Lucent Technologies Inc. Supervisory apparatus for optical transmission system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60167534A (en) * 1984-02-10 1985-08-30 Fujitsu Ltd Light branching photoelectric transducer
US5825515A (en) * 1991-09-03 1998-10-20 Lucent Technologies Inc. Supervisory apparatus for optical transmission system

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