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JPS5484402A - Single-mode fiber optical communication system - Google Patents

Single-mode fiber optical communication system

Info

Publication number
JPS5484402A
JPS5484402A JP15178377A JP15178377A JPS5484402A JP S5484402 A JPS5484402 A JP S5484402A JP 15178377 A JP15178377 A JP 15178377A JP 15178377 A JP15178377 A JP 15178377A JP S5484402 A JPS5484402 A JP S5484402A
Authority
JP
Japan
Prior art keywords
optical
communication system
light
led
electric signal
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
JP15178377A
Other languages
Japanese (ja)
Other versions
JPS5737262B2 (en
Inventor
Takao Matsumoto
Masaki Koyama
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.)
Nippon Telegraph and Telephone Corp
Original Assignee
Nippon Telegraph and Telephone Corp
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 Nippon Telegraph and Telephone Corp filed Critical Nippon Telegraph and Telephone Corp
Priority to JP15178377A priority Critical patent/JPS5484402A/en
Publication of JPS5484402A publication Critical patent/JPS5484402A/en
Publication of JPS5737262B2 publication Critical patent/JPS5737262B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B14/00—Transmission systems not characterised by the medium used for transmission
    • H04B14/002—Transmission systems not characterised by the medium used for transmission characterised by the use of a carrier modulation
    • H04B14/006—Angle modulation

Landscapes

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

Abstract

PURPOSE:To realize a communication system having the margin to the noise for the optical communication system using the single-mode optical fiber, by carrying out the optical phase modulation at the transmitter side and the differential synchronous phase detection at the receiver side respectively. CONSTITUTION:The light given from coherent light source 14 is led to external modulator 16 to undergo the phase modulation by the electric signal sent from transmitter 18. The light emitted from transmitting part 11 reaches receiving part 13 via single-mode optical fiber 20. The light is branched off at part 13 through optical branching circuit 22 and then led to input terminal 25a and 25b of optical hybrid circuit 25 via two optical waveguides 23 and 24 featuring different delay time. The light of two output terminals 25c 25d for the in-phase component and the reverse-phase component is converted into the electric signal to be led to receiver 29 after amplification through differential amplifier 28.
JP15178377A 1977-12-19 1977-12-19 Single-mode fiber optical communication system Granted JPS5484402A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15178377A JPS5484402A (en) 1977-12-19 1977-12-19 Single-mode fiber optical communication system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15178377A JPS5484402A (en) 1977-12-19 1977-12-19 Single-mode fiber optical communication system

Publications (2)

Publication Number Publication Date
JPS5484402A true JPS5484402A (en) 1979-07-05
JPS5737262B2 JPS5737262B2 (en) 1982-08-09

Family

ID=15526193

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15178377A Granted JPS5484402A (en) 1977-12-19 1977-12-19 Single-mode fiber optical communication system

Country Status (1)

Country Link
JP (1) JPS5484402A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61127236A (en) * 1984-11-26 1986-06-14 Nippon Telegr & Teleph Corp <Ntt> Optical transmission system

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5081003A (en) * 1973-11-16 1975-07-01

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5081003A (en) * 1973-11-16 1975-07-01

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61127236A (en) * 1984-11-26 1986-06-14 Nippon Telegr & Teleph Corp <Ntt> Optical transmission system

Also Published As

Publication number Publication date
JPS5737262B2 (en) 1982-08-09

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