JPS5737941A - Optical output circuit - Google Patents

Optical output circuit

Info

Publication number
JPS5737941A
JPS5737941A JP11123580A JP11123580A JPS5737941A JP S5737941 A JPS5737941 A JP S5737941A JP 11123580 A JP11123580 A JP 11123580A JP 11123580 A JP11123580 A JP 11123580A JP S5737941 A JPS5737941 A JP S5737941A
Authority
JP
Japan
Prior art keywords
value
level
light emitting
digital signal
inputted
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
JP11123580A
Other languages
Japanese (ja)
Inventor
Akira Miyauchi
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 JP11123580A priority Critical patent/JPS5737941A/en
Publication of JPS5737941A publication Critical patent/JPS5737941A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/38—Synchronous or start-stop systems, e.g. for Baudot code
    • H04L25/40—Transmitting circuits; Receiving circuits
    • H04L25/49—Transmitting circuits; Receiving circuits using code conversion at the transmitter; using predistortion; using insertion of idle bits for obtaining a desired frequency spectrum; using three or more amplitude levels ; Baseband coding techniques specific to data transmission systems
    • H04L25/4917—Transmitting circuits; Receiving circuits using code conversion at the transmitter; using predistortion; using insertion of idle bits for obtaining a desired frequency spectrum; using three or more amplitude levels ; Baseband coding techniques specific to data transmission systems using multilevel codes

Landscapes

  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Optical Communication System (AREA)
  • Semiconductor Lasers (AREA)
  • Led Devices (AREA)

Abstract

PURPOSE:To improve the S/N by identifying an electric n-value digital signal at each identifying circuit corresponding to n-value levels, and converting it into a binary digital signal with a light emitting element through shaping into binary pulse. CONSTITUTION:An electric multivalue digital signal inputted to a terminal 6 is identified at identification circuits T1-Tn-1 corresponding to each multilevel, and this output is inputted to pulse wave shape circuits P1-Pn-1 corresponded. The circuits P1-Pn-1 increase the level having larger numerical value as level of 1- value < level of 2-value < level of (n-1)-value, drives light emitting elements D1-Dn-1 corresponded, and converts them into optical signals with the specified level. The output of the light emitting elements is synthesized at a photosybthesis circuit and inputted to an optical fiber 8. Thus, the S/N is improved and the information amount of n/2 times can be transmitted.
JP11123580A 1980-08-13 1980-08-13 Optical output circuit Pending JPS5737941A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11123580A JPS5737941A (en) 1980-08-13 1980-08-13 Optical output circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11123580A JPS5737941A (en) 1980-08-13 1980-08-13 Optical output circuit

Publications (1)

Publication Number Publication Date
JPS5737941A true JPS5737941A (en) 1982-03-02

Family

ID=14555986

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11123580A Pending JPS5737941A (en) 1980-08-13 1980-08-13 Optical output circuit

Country Status (1)

Country Link
JP (1) JPS5737941A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5394261A (en) * 1990-09-25 1995-02-28 Canon Kabushiki Kaisha Optical communication system and transmitting apparatus for use therein
JP2002333603A (en) * 2001-05-08 2002-11-22 Mitsubishi Electric Corp Multi-level modulation device
JP2009124342A (en) * 2007-11-13 2009-06-04 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
JPS5448102A (en) * 1977-09-05 1979-04-16 Cselt Centro Studi Lab Telecom Optical fiber multiilevel signal transmitter

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5448102A (en) * 1977-09-05 1979-04-16 Cselt Centro Studi Lab Telecom Optical fiber multiilevel signal transmitter

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5394261A (en) * 1990-09-25 1995-02-28 Canon Kabushiki Kaisha Optical communication system and transmitting apparatus for use therein
JP2002333603A (en) * 2001-05-08 2002-11-22 Mitsubishi Electric Corp Multi-level modulation device
JP4744720B2 (en) * 2001-05-08 2011-08-10 三菱電機株式会社 Multilevel modulator
JP2009124342A (en) * 2007-11-13 2009-06-04 Nippon Telegr & Teleph Corp <Ntt> Optical transmission system

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