JPS57157642A - Optical signal transmitting system - Google Patents

Optical signal transmitting system

Info

Publication number
JPS57157642A
JPS57157642A JP56041776A JP4177681A JPS57157642A JP S57157642 A JPS57157642 A JP S57157642A JP 56041776 A JP56041776 A JP 56041776A JP 4177681 A JP4177681 A JP 4177681A JP S57157642 A JPS57157642 A JP S57157642A
Authority
JP
Japan
Prior art keywords
pulse
signal
optical signal
information signal
transmitter
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
JP56041776A
Other languages
Japanese (ja)
Inventor
Shuzo Kato
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 JP56041776A priority Critical patent/JPS57157642A/en
Publication of JPS57157642A publication Critical patent/JPS57157642A/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

Abstract

PURPOSE:To check abnormalities in a titled optical signal transmitting system by monitoring the intervals of low levels in receiving signals at the receiver side, by monitoring an information signal at the transmitter side, by making a pulse signal when there is no information signal for a fixed period, and by optically transmitting the pulse signal. CONSTITUTION:A fixed time is set to a pulse adding circuit 11 of a transmitter 1, the adder 11 outputs a pulse at a fixed time interval during a period where an information signal outputted from a sensor 10 is in a range from the trailing edge to a low level, and the pulse is added to the information signal digitally. This added signal is converted into an optical signal at an electrooptic converter 12, and made incident to a receiver 3 through a light transmitting path 2. This optical signal is converted into an electric pulse at a photoelectric converter 13 and the pulse is discriminated through a low-pass filter 14. An abnormality detecting circuit 15 monitors the interval of signals at low level. In this way, abnormalities in the light transmitting path 2 and the transmitter 1 are detected.
JP56041776A 1981-03-24 1981-03-24 Optical signal transmitting system Pending JPS57157642A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56041776A JPS57157642A (en) 1981-03-24 1981-03-24 Optical signal transmitting system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56041776A JPS57157642A (en) 1981-03-24 1981-03-24 Optical signal transmitting system

Publications (1)

Publication Number Publication Date
JPS57157642A true JPS57157642A (en) 1982-09-29

Family

ID=12617772

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56041776A Pending JPS57157642A (en) 1981-03-24 1981-03-24 Optical signal transmitting system

Country Status (1)

Country Link
JP (1) JPS57157642A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63312743A (en) * 1987-06-16 1988-12-21 Nec Corp Fault detecting mechanism for ring type network

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63312743A (en) * 1987-06-16 1988-12-21 Nec Corp Fault detecting mechanism for ring type network

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