FR2364572A1 - Dispositif de telecommunications optiques - Google Patents

Dispositif de telecommunications optiques

Info

Publication number
FR2364572A1
FR2364572A1 FR7727324A FR7727324A FR2364572A1 FR 2364572 A1 FR2364572 A1 FR 2364572A1 FR 7727324 A FR7727324 A FR 7727324A FR 7727324 A FR7727324 A FR 7727324A FR 2364572 A1 FR2364572 A1 FR 2364572A1
Authority
FR
France
Prior art keywords
signal
optical telecommunications
input signal
emphasis circuit
telecommunications device
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
FR7727324A
Other languages
English (en)
Other versions
FR2364572B1 (fr
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
Publication of FR2364572A1 publication Critical patent/FR2364572A1/fr
Application granted granted Critical
Publication of FR2364572B1 publication Critical patent/FR2364572B1/fr
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
    • H04B10/50—Transmitters
    • H04B10/516—Details of coding or modulation
    • H04B10/54—Intensity modulation
    • H04B10/541—Digital intensity or amplitude modulation
    • 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
    • H04B10/50—Transmitters
    • H04B10/501—Structural aspects
    • H04B10/502—LED transmitters
    • 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
    • H04B10/50—Transmitters
    • H04B10/564—Power control
    • 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
    • H04B10/50—Transmitters
    • H04B10/58—Compensation for non-linear transmitter output

Landscapes

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

Abstract

L'invention concerne la modulation de l'intensité d'une source lumineuse. Un dispositif de modulation pour diode électroluminescente comporte un circuit d'accentuation 2 qui reçoit le signal d'entrée et qui applique à ce signal une amplification variable avec la fréquence, pour tenir compte de la non-linéarité introduite par la réponse thermique de la diode électroluminescente dans la région des fréquences basses. Le dispositif de démodulation comporte un circuit de désaccentuation 8 qui accomplit une action inverse, pour donner sur la sortie 10 un signal identique au signal d'entrée. Application aux télécommunications optiques.
FR7727324A 1976-09-13 1977-09-09 Dispositif de telecommunications optiques Granted FR2364572A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP51109702A JPS5813038B2 (ja) 1976-09-13 1976-09-13 Ｌｅｄ変調方式

Publications (2)

Publication Number Publication Date
FR2364572A1 true FR2364572A1 (fr) 1978-04-07
FR2364572B1 FR2364572B1 (fr) 1982-11-19

Family

ID=14517034

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7727324A Granted FR2364572A1 (fr) 1976-09-13 1977-09-09 Dispositif de telecommunications optiques

Country Status (6)

Country Link
US (1) US4207459A (fr)
JP (1) JPS5813038B2 (fr)
CA (1) CA1087690A (fr)
DE (1) DE2740343A1 (fr)
FR (1) FR2364572A1 (fr)
GB (1) GB1581238A (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2495412A1 (fr) * 1980-12-02 1982-06-04 Thomson Csf Systeme de transmission d'informations a modulation directe de la lumiere a liaison optique a bande passante etendue vers les frequences basses et le continu
FR2630279A1 (fr) * 1988-04-15 1989-10-20 Thomson Csf Procede et dispositif de controle d'une liaison numerique

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE426345B (sv) * 1981-05-18 1982-12-27 Asea Ab Fiberoptiskt metdon for metning av fysikaliska och/eller kemiska storheter, baserat pa sensormaterial med en olinjer ljus in/ljus ut karakteristik
FR2556105B1 (fr) * 1983-12-02 1986-08-29 Thomson Csf Canal de transmission optique a connecteurs electriques
US5202783A (en) * 1991-06-24 1993-04-13 The United States Of America As Represented By The Secretary Of The Navy Secure and programmable friendly target recognition system
US5941989A (en) * 1997-01-07 1999-08-24 Micron Electronics, Inc. Apparatus for indicating power-consumption status in a computer system
DE19815491C2 (de) * 1998-04-07 2000-04-27 Vishay Semiconductor Gmbh Verfahren und Schaltungsanordnung zum Ansteuern einer Luminiszenzdiode
JP2003134051A (ja) * 2001-10-25 2003-05-09 Opnext Japan Inc 光受信モジュール、光受信器及び光ファイバ通信機器

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3814929A (en) * 1972-05-05 1974-06-04 Sperry Rand Corp Laser data transmitter with wide frequency bandwidth
US3845242A (en) * 1972-11-21 1974-10-29 Minnesota Mining & Mfg Video signal processing system for facsimile transmission
US3927316A (en) * 1974-06-07 1975-12-16 Zenith Radio Corp Wireless speaker system using infra-red link
US3984824A (en) * 1975-07-25 1976-10-05 The United States Of America As Represented By The Secretary Of The Army Wide-band optical analog signal link using fiber optics

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2495412A1 (fr) * 1980-12-02 1982-06-04 Thomson Csf Systeme de transmission d'informations a modulation directe de la lumiere a liaison optique a bande passante etendue vers les frequences basses et le continu
EP0053545A1 (fr) * 1980-12-02 1982-06-09 Thomson-Csf Système de transmission d'informations à modulation directe de la lumière à liaison optique à bande passante étendue vers les fréquences basses et le continu
FR2630279A1 (fr) * 1988-04-15 1989-10-20 Thomson Csf Procede et dispositif de controle d'une liaison numerique

Also Published As

Publication number Publication date
FR2364572B1 (fr) 1982-11-19
JPS5813038B2 (ja) 1983-03-11
US4207459A (en) 1980-06-10
CA1087690A (fr) 1980-10-14
GB1581238A (en) 1980-12-10
DE2740343A1 (de) 1978-04-06
JPS5335355A (en) 1978-04-01

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Legal Events

Date Code Title Description
ST Notification of lapse
ST Notification of lapse