JPS5669941A - Light transmitter - Google Patents

Light transmitter

Info

Publication number
JPS5669941A
JPS5669941A JP14608079A JP14608079A JPS5669941A JP S5669941 A JPS5669941 A JP S5669941A JP 14608079 A JP14608079 A JP 14608079A JP 14608079 A JP14608079 A JP 14608079A JP S5669941 A JPS5669941 A JP S5669941A
Authority
JP
Japan
Prior art keywords
light emitting
light
emission wavelength
light emission
optical fiber
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
JP14608079A
Other languages
Japanese (ja)
Inventor
Masayuki Takami
Takao Ito
Toshifumi Tamura
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.)
Toshiba Corp
Original Assignee
Toshiba Corp
Tokyo Shibaura 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 Toshiba Corp, Tokyo Shibaura Electric Co Ltd filed Critical Toshiba Corp
Priority to JP14608079A priority Critical patent/JPS5669941A/en
Publication of JPS5669941A publication Critical patent/JPS5669941A/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
    • H04L25/4923—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 using ternary codes
    • H04L25/4925—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 using ternary codes using balanced bipolar ternary 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)
  • Dc Digital Transmission (AREA)

Abstract

PURPOSE:To enable stable and excellent data transmission by a device that transmits a digital signal via optical fiber, by transmitting binary codes with three levels by using two light emitting elements differing in center light emission wavelength. CONSTITUTION:Data applied to input terminal 1 is converted by driving circuit 2 into psuedo-ternary codes having no DC component; light emitting element 3 of center light emission wavelength lambda1 turns on in response to a positive-polarity pulse, and light emitting element 4 of center light emission wavelength lambda2 in response to a negative-polarity pulse. Light outputs of light emitting elements 3 and 4 are, after being mixed by light mixer 5 and transmitted via optical fiber 6, are separated light branching filter 7 into lambda1 and lambda2, which are detected photodetectors 8 and 9 respectively. Next, a bipolar signal is obtained by preamplifier 10 and, after being amplified by main amplifier 11 at the next stage, is supplied to comparators 12 and 15 to detect positive and negative-polarity pulses and their detection outputs are mixed by OR circuit 16 to reproduce the transmitted data.
JP14608079A 1979-11-13 1979-11-13 Light transmitter Pending JPS5669941A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14608079A JPS5669941A (en) 1979-11-13 1979-11-13 Light transmitter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14608079A JPS5669941A (en) 1979-11-13 1979-11-13 Light transmitter

Publications (1)

Publication Number Publication Date
JPS5669941A true JPS5669941A (en) 1981-06-11

Family

ID=15399654

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14608079A Pending JPS5669941A (en) 1979-11-13 1979-11-13 Light transmitter

Country Status (1)

Country Link
JP (1) JPS5669941A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58111444A (en) * 1981-12-24 1983-07-02 Hitachi Ltd Optical receiver for digital communication
WO2011127274A1 (en) * 2010-04-07 2011-10-13 Mesa Imaging Ag Multi-level digital modulation for time of flight method and system

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58111444A (en) * 1981-12-24 1983-07-02 Hitachi Ltd Optical receiver for digital communication
WO2011127274A1 (en) * 2010-04-07 2011-10-13 Mesa Imaging Ag Multi-level digital modulation for time of flight method and system
US9341715B2 (en) 2010-04-07 2016-05-17 Heptagon Micro Optics Pte. Ltd. Multi-level digital modulation for time of flight method and system

Similar Documents

Publication Publication Date Title
ATE44199T1 (en) FIBER OPTIC RECEIVER.
DE69032875D1 (en) Optical distribution of analog and digital signals using optical modulators with complementary outputs
GB1429724A (en) Dual wavelength photometer response circuit
ES8301562A1 (en) An arrangement for increasing the dynamic range at the input stage of a receiver in an optical fibre information transmission system.
JPS5669941A (en) Light transmitter
ATE141735T1 (en) OPTICAL DETECTOR
EP0314508A3 (en) Optical communications apparatus
JPS56169948A (en) Optical multiplex transmission system
JPS56112143A (en) Equipment for receiving wave length multiple optical signal
JPS5639641A (en) Light communication system
JPS5797734A (en) Receiving device
JPS55115746A (en) Optical communication system
JPS57103445A (en) Optical communication device
JPS5542453A (en) Information detecting transmitter
JPS5713837A (en) Code transmission system
DE68908684T2 (en) Device for the transmission of asynchronous data via an infrared channel.
JPS5654135A (en) Optical transmission system
JPS57194645A (en) Optical multiplex transmission system
JPS57208738A (en) Optical transmitter
SU907851A1 (en) Device for receiving amplitude-mldulated telegraph signals
JPS54140405A (en) Optical communication system
JPS58161553A (en) Optical transmitting and receiving device of bipolar signal
JPS5654319A (en) Optical detector
JPS5654134A (en) Optical transmission system
JPS5631249A (en) Signal transmission system