WO1998018221A1 - Emetteur optique et systeme de transmission optique - Google Patents

Emetteur optique et systeme de transmission optique Download PDF

Info

Publication number
WO1998018221A1
WO1998018221A1 PCT/JP1996/003021 JP9603021W WO9818221A1 WO 1998018221 A1 WO1998018221 A1 WO 1998018221A1 JP 9603021 W JP9603021 W JP 9603021W WO 9818221 A1 WO9818221 A1 WO 9818221A1
Authority
WO
WIPO (PCT)
Prior art keywords
optical transmission
signal
optical
laser diode
transmission 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.)
Ceased
Application number
PCT/JP1996/003021
Other languages
English (en)
Japanese (ja)
Inventor
Makoto Haneda
Hiroaki Hanawa
Katsuyoshi Harasawa
Kenji Yamahara
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.)
Hitachi Microcomputer System Ltd
Hitachi Ltd
Hitachi Information and Telecommunication Engineering Ltd
Original Assignee
Hitachi Microcomputer System Ltd
Hitachi Ltd
Hitachi Communication Systems Inc
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 Hitachi Microcomputer System Ltd, Hitachi Ltd, Hitachi Communication Systems Inc filed Critical Hitachi Microcomputer System Ltd
Priority to PCT/JP1996/003021 priority Critical patent/WO1998018221A1/fr
Publication of WO1998018221A1 publication Critical patent/WO1998018221A1/fr
Anticipated expiration legal-status Critical
Ceased 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

Definitions

  • FIG. 7 is a schematic diagram showing an example of a subscriber optical transmission system.
  • FIG. 8 is a block diagram showing a conventional optical transmission device. BEST MODE FOR CARRYING OUT THE INVENTION
  • the on-hook signal Soh input to the set-top box 12 from the personal computer 10 or the telephone 11 is sent directly from the set-top box 12 to the control IC 23.
  • the CPU 30 obtains the temperature of the operating environment by the sensor 50, reads the value of the bias current corresponding to the obtained temperature from the ROM 32, and based on the read value. Generate the bias signal Sb. As a result, a bias current of a magnitude commensurate with the operating temperature flows through the LD 21A.
  • the LD 21A of the optical transmission device installed at the subscriber's house is normally in a zero bias state, and the bias current is applied to the LD 21A only when the personal computer 10 or the telephone 11 is on-hook.

Landscapes

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

Abstract

Cette invention concerne un système de transmission optique qui fait appel à un système de transmission de type point-multipoint. Un émetteur optique, installé dans la maison d'un abonné, comprend une unité de commande qui va gérer l'actionnement d'un DL. A l'aide cette unité de commande, le DL de l'émetteur optique est normalement réglé à un état de polarisation zéro ou à un état de polarisation inverse. On mesure ensuite un signal d'état raccroché qui est envoyé par l'appareil téléphonique ou par un ordinateur connecté à l'émetteur optique lorsque l'utilisateur a mis ledit téléphone ou ordinateur en mode de fonctionnement raccroché. Un courant de polarisation aval est ensuite envoyé à travers le DL en fonction du signal d'état raccroché. Etant donné que le DL de l'émetteur optique installé chez l'abonné se trouve à un état de polarisation inverse ou de polarisation zéro lors du mode de fonctionnement raccroché, les composantes d'émission spontanées vont disparaître dudit DL. En outre, étant donné que l'on envoie au DL un courant modulé qui est fonction du signal de données à transmettre pendant que le courant de polarisation aval traverse ledit DL, ce dernier va émettre les signaux optiques sans retard d'émission lumineuse.
PCT/JP1996/003021 1996-10-18 1996-10-18 Emetteur optique et systeme de transmission optique Ceased WO1998018221A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/JP1996/003021 WO1998018221A1 (fr) 1996-10-18 1996-10-18 Emetteur optique et systeme de transmission optique

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP1996/003021 WO1998018221A1 (fr) 1996-10-18 1996-10-18 Emetteur optique et systeme de transmission optique

Publications (1)

Publication Number Publication Date
WO1998018221A1 true WO1998018221A1 (fr) 1998-04-30

Family

ID=14153989

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP1996/003021 Ceased WO1998018221A1 (fr) 1996-10-18 1996-10-18 Emetteur optique et systeme de transmission optique

Country Status (1)

Country Link
WO (1) WO1998018221A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005535271A (ja) * 2002-08-02 2005-11-17 フィニサー コーポレイション プログラム可能な信号パラメータを備えた送受信器

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6135584A (ja) * 1984-07-27 1986-02-20 Fujitsu Ltd レ−ザダイオ−ドの自動電力制御回路
JPS6161535A (ja) * 1984-09-03 1986-03-29 Agency Of Ind Science & Technol 光送信装置
JPH05291836A (ja) * 1992-04-09 1993-11-05 Fujitsu Ltd 光受信装置
JPH0832517A (ja) * 1994-07-18 1996-02-02 Nippon Telegr & Teleph Corp <Ntt> 光送受信回路

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6135584A (ja) * 1984-07-27 1986-02-20 Fujitsu Ltd レ−ザダイオ−ドの自動電力制御回路
JPS6161535A (ja) * 1984-09-03 1986-03-29 Agency Of Ind Science & Technol 光送信装置
JPH05291836A (ja) * 1992-04-09 1993-11-05 Fujitsu Ltd 光受信装置
JPH0832517A (ja) * 1994-07-18 1996-02-02 Nippon Telegr & Teleph Corp <Ntt> 光送受信回路

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005535271A (ja) * 2002-08-02 2005-11-17 フィニサー コーポレイション プログラム可能な信号パラメータを備えた送受信器

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