JPS55134551A - Two-way optical communication system - Google Patents

Two-way optical communication system

Info

Publication number
JPS55134551A
JPS55134551A JP4177279A JP4177279A JPS55134551A JP S55134551 A JPS55134551 A JP S55134551A JP 4177279 A JP4177279 A JP 4177279A JP 4177279 A JP4177279 A JP 4177279A JP S55134551 A JPS55134551 A JP S55134551A
Authority
JP
Japan
Prior art keywords
light
signal
laser
optical fiber
strikes
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
JP4177279A
Other languages
Japanese (ja)
Other versions
JPS6161302B2 (en
Inventor
Masahiko Fujiwara
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.)
NEC Corp
Original Assignee
NEC Corp
Nippon 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 NEC Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP4177279A priority Critical patent/JPS55134551A/en
Publication of JPS55134551A publication Critical patent/JPS55134551A/en
Publication of JPS6161302B2 publication Critical patent/JPS6161302B2/ja
Granted 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
    • H04B10/25—Arrangements specific to fibre transmission
    • H04B10/2587—Arrangements specific to fibre transmission using a single light source for multiple stations

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Optical Communication System (AREA)

Abstract

PURPOSE:To make two-way optical communication possible by only one optical fiber and semiconductor laser by modulating emitted light at the emission terminal side of the optical fiber corresponding to an information signal and then by feeding the modulated light to the semiconductor laser via the optical fiber from the emission terminal side. CONSTITUTION:Signal A to be transmitted to terminal 21 is applied and modulated by pulse modulator 22 into a modulated signal, which is applied to semiconductor laser 24. Radiated laser light 25 from laser 24 is coupled with optical fiber 27 via coupling circuit 26 and then strikes photo detector 29 by way of focusing optical system 28 at the emission side and half mirror 32. The electric output of detector 29 is passed through demodulator 30 to output signal A. Of the laser light emitted from optical system 28, light reflected by mirror 32 is reflected by reflex mirror 33 and strikes fiber 27 again to obtain feedback light 35, which strikes laser 24. Modulator 40 is applied with signal B and chopper 38 is driven by its output to modulate feedback light 35 by signal B; and the demodulated light is detected by photo detector 37 and after feedback light 36 is separated by a filter, it is inputted to demodulator 41 to obtain signal B.
JP4177279A 1979-04-06 1979-04-06 Two-way optical communication system Granted JPS55134551A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4177279A JPS55134551A (en) 1979-04-06 1979-04-06 Two-way optical communication system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4177279A JPS55134551A (en) 1979-04-06 1979-04-06 Two-way optical communication system

Publications (2)

Publication Number Publication Date
JPS55134551A true JPS55134551A (en) 1980-10-20
JPS6161302B2 JPS6161302B2 (en) 1986-12-25

Family

ID=12617668

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4177279A Granted JPS55134551A (en) 1979-04-06 1979-04-06 Two-way optical communication system

Country Status (1)

Country Link
JP (1) JPS55134551A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2558025A1 (en) * 1984-01-10 1985-07-12 Thomson Csf Connection system for simultaneous bidirectional transmissions by optical fibre.

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2558025A1 (en) * 1984-01-10 1985-07-12 Thomson Csf Connection system for simultaneous bidirectional transmissions by optical fibre.

Also Published As

Publication number Publication date
JPS6161302B2 (en) 1986-12-25

Similar Documents

Publication Publication Date Title
ATE6453T1 (en) CIRCUIT ARRANGEMENT WITH A LASER DIODE FOR TRANSMISSION OF MESSAGE SIGNALS VIA AN OPTICAL WAVE.
EP0390525A3 (en) An optical pumping-type solid-state laser apparatus with a semiconductor laser device
JPS55134551A (en) Two-way optical communication system
JPS57162542A (en) Optical signal transmitting system
JPS55146403A (en) Photo branching and distributing device
JPS56162554A (en) Optical amplifying repeater
JPS5450203A (en) Transmitter for optical fiber communication
JPS5797734A (en) Receiving device
JPS53116882A (en) Optical temperature detector
JPS57173238A (en) Optical transmitter
NO872711D0 (en) IDENTIFICATION DEVICE.
JPS56102832A (en) Light intensity correcting device of acoustic optical light deflector
JPS54141590A (en) Photo output stabilizing circuit
JPS5683089A (en) Light modulation system
JPS5470002A (en) Optical information reader
GB1203761A (en) Improvements relating to current transformer assemblies
JPS574625A (en) Optical communication system
JPS56164307A (en) Optical modulator
JPS53100789A (en) Photo semiconductor device
JPS5711571A (en) Information recorder
JPS5711569A (en) Information recorder
JPS54118105A (en) Secondary signal insertion system
JPS6410224A (en) Laser device
JPS56126964A (en) Integrated circuit element
JPS57176422A (en) Remote monitor and control device