JPS5636243A - Photosignal system - Google Patents

Photosignal system

Info

Publication number
JPS5636243A
JPS5636243A JP11132479A JP11132479A JPS5636243A JP S5636243 A JPS5636243 A JP S5636243A JP 11132479 A JP11132479 A JP 11132479A JP 11132479 A JP11132479 A JP 11132479A JP S5636243 A JPS5636243 A JP S5636243A
Authority
JP
Japan
Prior art keywords
photosignal
signal
call
returning
telephone set
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
JP11132479A
Other languages
Japanese (ja)
Other versions
JPS6219098B2 (en
Inventor
Tatsu Tsuda
Michimitsu Hattori
Shuzo Morita
Haruki Fukuda
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 JP11132479A priority Critical patent/JPS5636243A/en
Publication of JPS5636243A publication Critical patent/JPS5636243A/en
Publication of JPS6219098B2 publication Critical patent/JPS6219098B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/003—Telephone sets using electrooptical means in the transmission path

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Optical Communication System (AREA)
  • Interface Circuits In Exchanges (AREA)

Abstract

PURPOSE:To make light emitting elements of a telephone set needless to reduce power consumption, by modulating the photosignal, which is transmitted from the exchange, by the dial signal of the telephone set, the call signal, and so on and by returning the photosignal to the exchange. CONSTITUTION:In exchange 1, light emitting element 13 is driven by the call signal and the incoming signal to generate a photosignal for call, and light emitting element 11 is driven by a constant current to generate a photosignal for returning, and they are subjected to wave length multiplexing by coupler 14 and are transmitted to optical fiber 21. In telephone set 3, the photosignal for call is applied to telephone set circuit 33 by branching filter 32 to drive the incoming display unit, and the receiver is driven by off-hook. Meanwhile, the photosignal for returning is applied to returning part 31 and is modulated by the dial signal and the call signal and is transmitted to down optical fiber 22. Receiving control part 15 transfers the dial signal and the call signal to the common control unit and so on and the other-party subscriber respectively.
JP11132479A 1979-08-31 1979-08-31 Photosignal system Granted JPS5636243A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11132479A JPS5636243A (en) 1979-08-31 1979-08-31 Photosignal system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11132479A JPS5636243A (en) 1979-08-31 1979-08-31 Photosignal system

Publications (2)

Publication Number Publication Date
JPS5636243A true JPS5636243A (en) 1981-04-09
JPS6219098B2 JPS6219098B2 (en) 1987-04-27

Family

ID=14558318

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11132479A Granted JPS5636243A (en) 1979-08-31 1979-08-31 Photosignal system

Country Status (1)

Country Link
JP (1) JPS5636243A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4525873A (en) * 1981-09-24 1985-06-25 Siemens Aktiengesellschaft Device for transmitting measured values to a remote location
US4525874A (en) * 1981-09-24 1985-06-25 Siemens Aktiengesellschaft Device for transmitting measured values to a remote location
JPH0225126A (en) * 1988-07-14 1990-01-26 Fujitsu Ltd Optical subscriber line transmission system
JPH02150132A (en) * 1988-12-01 1990-06-08 Yokogawa Electric Corp Process signal transmission equipment
JPH02214248A (en) * 1989-02-14 1990-08-27 Tohoku Electric Power Co Inc Optical telephone set

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS533704A (en) * 1976-06-30 1978-01-13 Nec Corp Photo-fiber transmission system

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS533704A (en) * 1976-06-30 1978-01-13 Nec Corp Photo-fiber transmission system

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4525873A (en) * 1981-09-24 1985-06-25 Siemens Aktiengesellschaft Device for transmitting measured values to a remote location
US4525874A (en) * 1981-09-24 1985-06-25 Siemens Aktiengesellschaft Device for transmitting measured values to a remote location
JPH0225126A (en) * 1988-07-14 1990-01-26 Fujitsu Ltd Optical subscriber line transmission system
JPH02150132A (en) * 1988-12-01 1990-06-08 Yokogawa Electric Corp Process signal transmission equipment
JPH02214248A (en) * 1989-02-14 1990-08-27 Tohoku Electric Power Co Inc Optical telephone set

Also Published As

Publication number Publication date
JPS6219098B2 (en) 1987-04-27

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