JPS5545240A - Optical transmission unit - Google Patents

Optical transmission unit

Info

Publication number
JPS5545240A
JPS5545240A JP11834278A JP11834278A JPS5545240A JP S5545240 A JPS5545240 A JP S5545240A JP 11834278 A JP11834278 A JP 11834278A JP 11834278 A JP11834278 A JP 11834278A JP S5545240 A JPS5545240 A JP S5545240A
Authority
JP
Japan
Prior art keywords
signals
circuits
faulty
fibers
switching circuit
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
JP11834278A
Other languages
Japanese (ja)
Inventor
Takeshige Ichida
Shigeru Minagawa
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial 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 Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP11834278A priority Critical patent/JPS5545240A/en
Publication of JPS5545240A publication Critical patent/JPS5545240A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/74—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission for increasing reliability, e.g. using redundant or spare channels or apparatus

Abstract

PURPOSE:To obtain a high-reliability optical transmission unit by utilizing the solid wire two-way communication path of plural optical transmission fibers to return information indicating presence and absence of receiving signals to the transmission side and selecting a normal transmission path to insert signals of the faulty transmission system when the transmission path is faulty. CONSTITUTION:In video modulator circuits 1 and 2, modulation signals of, for example, three video signals are mixed into one signal. A space of one-channel CH components is provided in arrangement of the modulation frequency, and circuits 1 and 2 are placed in positions corresponding to space channels of each other. Outputs of circuits 1 and 2 are connected to light emission circuits 5 and 6 respectively through switching circuit 4 and are transmitted to the receiving side through photo coupling branch equipments 7 and 8 and fibers 9 and 10. In case that one of fibers is faulty, it is inspected by detection circuits 15 and 16 whether a carrier wave exists or not, and this information is sent to switching circuit 22 and is changed to optical signals by light emission circuit 17 or 18, and these signals are sent to detection signal light receiving circuit 19 or 20 through photo coupling branch equipment 11 or 12 or fibers. Outputs of circuits 19 and 20 select a normal transmission system through switching circuit 21, and modulation signals of the faulty system are inserted into the space CH to transmit signals.
JP11834278A 1978-09-25 1978-09-25 Optical transmission unit Pending JPS5545240A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11834278A JPS5545240A (en) 1978-09-25 1978-09-25 Optical transmission unit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11834278A JPS5545240A (en) 1978-09-25 1978-09-25 Optical transmission unit

Publications (1)

Publication Number Publication Date
JPS5545240A true JPS5545240A (en) 1980-03-29

Family

ID=14734299

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11834278A Pending JPS5545240A (en) 1978-09-25 1978-09-25 Optical transmission unit

Country Status (1)

Country Link
JP (1) JPS5545240A (en)

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