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1. WO1997014232 - OPTICAL COMMUNICATION SYSTEM

Publication Number WO/1997/014232
Publication Date 17.04.1997
International Application No. PCT/GB1996/002501
International Filing Date 11.10.1996
Chapter 2 Demand Filed 26.02.1997
IPC
H04B 10/2575 2013.01
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
BTRANSMISSION
10Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
25Arrangements specific to fibre transmission
2575Radio-over-fibre, e.g. radio frequency signal modulated onto an optical carrier
CPC
H04B 10/25753
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
BTRANSMISSION
10Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
25Arrangements specific to fibre transmission
2575Radio-over-fibre, e.g. radio frequency signal modulated onto an optical carrier
25752Optical arrangements for wireless networks
25753Distribution optical network, e.g. between a base station and a plurality of remote units
H04B 10/25754
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
BTRANSMISSION
10Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
25Arrangements specific to fibre transmission
2575Radio-over-fibre, e.g. radio frequency signal modulated onto an optical carrier
25752Optical arrangements for wireless networks
25753Distribution optical network, e.g. between a base station and a plurality of remote units
25754Star network topology
Applicants
  • BRITISH TELECOMMUNICATIONS PUBLIC LIMITED COMPANY [GB]/[GB] (AllExceptUS)
  • WAKE, David [GB]/[GB] (UsOnly)
Inventors
  • WAKE, David
Agents
  • WELLS, David
Priority Data
9520946.613.10.1995GB
95308583.429.11.1995EP
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) OPTICAL COMMUNICATION SYSTEM
(FR) SYSTEME DE COMMUNICATION OPTIQUE
Abstract
(EN)
An optical distribution system is used for a signal to be transmitted at radio frequencies, for example to mobile telephone users. High frequency (LO) and Intermediate Frequence (IF) signals are modulated onto optical supercarriers. The optical signals are distributed via an optical network to one or more remote sites. An integral mixer/detector at the remote site both mixes the signals and converts them to the electrical domain, thereby generating the RF electrical signal required for transmission. In a preferred embodiment, the mixer/detector is a Heterojunction Bipolar Transistor.
(FR)
On utilise un système de distribution optique pour un signal devant être transmis à des fréquences radio, par exemple, à des usagers du téléphone mobile. Les signaux haute fréquence (LO) et de fréquence intermédiaire (IF) sont modulés sur des superporteuses optiques. Les signaux optiques sont distribués par l'intermédiaire d'un réseau optique à une ou plusieurs stations à distance. Un mélangeur/détecteur faisant partie de la station à distance mélange les signaux et les convertit en signaux électriques, ce qui produit le signal électrique radiofréquence nécessaire à la transmission. Dans un mode de réalisation préféré, le mélangeur/détecteur est un transistor bipolaire à hétérojonction.
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