JPS57194645A - Optical multiplex transmission system - Google Patents

Optical multiplex transmission system

Info

Publication number
JPS57194645A
JPS57194645A JP56079756A JP7975681A JPS57194645A JP S57194645 A JPS57194645 A JP S57194645A JP 56079756 A JP56079756 A JP 56079756A JP 7975681 A JP7975681 A JP 7975681A JP S57194645 A JPS57194645 A JP S57194645A
Authority
JP
Japan
Prior art keywords
optical
photodetector
voltage levels
transmitting
kinds
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
JP56079756A
Other languages
Japanese (ja)
Inventor
Mitsuki Sagane
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.)
Ricoh Co Ltd
Original Assignee
Ricoh 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 Ricoh Co Ltd filed Critical Ricoh Co Ltd
Priority to JP56079756A priority Critical patent/JPS57194645A/en
Publication of JPS57194645A publication Critical patent/JPS57194645A/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
    • H04B10/50—Transmitters
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems

Abstract

PURPOSE:To separately obtain a pulse of each channel from an output signal of a photodetector, by transmitting optical pulses of plural channels whose optical power is different, in the transmitting side, transmitting them by an optical fiber, and photodetecting them by one photodetector. CONSTITUTION:Light sources 2-4 are driven by driving circuits 6-8, generate optical pulses different in optical powers P1-P3, and they are transmitted through a branch type optical fiber 1. Optical pulse signals from the light sources 2-4 are converted to voltage V1-V3 proportional to a photocurrent, by a photodetector of a photodetecting circuit 5, are amplified to a constant level by an amplifier 9, and are inputted to a signal separating circuit 10. In the receiving side, the optical pulses appear in a superposed form, and in case when 3 optical channels exist, signals (1)-(7) of 7 kinds of receiving voltage levels appear. In the signal separating circuit 10, the pulse signals of each channel are separated by reference voltage levels Ref1-Ref7 being in the middle of 7 kinds of receiving voltage levels.
JP56079756A 1981-05-26 1981-05-26 Optical multiplex transmission system Pending JPS57194645A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56079756A JPS57194645A (en) 1981-05-26 1981-05-26 Optical multiplex transmission system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56079756A JPS57194645A (en) 1981-05-26 1981-05-26 Optical multiplex transmission system

Publications (1)

Publication Number Publication Date
JPS57194645A true JPS57194645A (en) 1982-11-30

Family

ID=13699058

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56079756A Pending JPS57194645A (en) 1981-05-26 1981-05-26 Optical multiplex transmission system

Country Status (1)

Country Link
JP (1) JPS57194645A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0291943A2 (en) * 1987-05-21 1988-11-23 Sharp Kabushiki Kaisha State detecting arrangement
WO2008149734A1 (en) * 2007-05-31 2008-12-11 Sony Corporation Optical waveguide, signal processing device, and signal processing substrate
JP2009009102A (en) * 2007-05-31 2009-01-15 Sony Corp Optical waveguide, signal processing device, and signal processing substrate

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4871815A (en) * 1971-12-27 1973-09-28
JPS50114908A (en) * 1974-02-18 1975-09-09

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4871815A (en) * 1971-12-27 1973-09-28
JPS50114908A (en) * 1974-02-18 1975-09-09

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0291943A2 (en) * 1987-05-21 1988-11-23 Sharp Kabushiki Kaisha State detecting arrangement
EP0291943B1 (en) * 1987-05-21 1994-08-03 Sharp Kabushiki Kaisha State detecting arrangement
WO2008149734A1 (en) * 2007-05-31 2008-12-11 Sony Corporation Optical waveguide, signal processing device, and signal processing substrate
JP2009009102A (en) * 2007-05-31 2009-01-15 Sony Corp Optical waveguide, signal processing device, and signal processing substrate
US8346034B2 (en) 2007-05-31 2013-01-01 Sony Corporation Optical selector switch and signal-processing apparatus

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