GB1297922A - - Google Patents

Info

Publication number
GB1297922A
GB1297922A GB1297922DA GB1297922A GB 1297922 A GB1297922 A GB 1297922A GB 1297922D A GB1297922D A GB 1297922DA GB 1297922 A GB1297922 A GB 1297922A
Authority
GB
United Kingdom
Prior art keywords
tuned circuit
optical
receiver
transmission system
output
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.)
Expired
Application number
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 filed Critical
Publication of GB1297922A publication Critical patent/GB1297922A/en
Expired 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
    • H04B10/60—Receivers
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F2/00—Demodulating light; Transferring the modulation of modulated light; Frequency-changing of light
    • 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
    • H04B10/60—Receivers
    • H04B10/61—Coherent receivers
    • H04B10/64—Heterodyne, i.e. coherent receivers where, after the opto-electronic conversion, an electrical signal at an intermediate frequency [fIF] is obtained
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J1/00—Frequency-division multiplex systems
    • H04J1/20—Frequency-division multiplex systems in which at least one carrier is angle-modulated

Abstract

1297922 Optical transmission system Q V DAVIS and W K KULCZYK 19 April 1971 [25 Nov 1969] 57635/69 Heading G1A In a receiver for a modulated optical carrier of an optical information transmission system wherein a photo electric transducer exhibiting an avalanche effect is used to detect the optical signal the transducer is biased by a radio frequency in order to produce an output intermediate frequency carrying as modulation the information bearing signals. An avalanche diode having a D.C. bias is connected between an R.F. input-tuned circuit and an output I.F. tuned circuit the tuned circuit including tapped inductances for impedance matching. Incorporation of the receiver in a multi-channel system using a laser and fibre optics is described.
GB1297922D 1969-11-25 1969-11-25 Expired GB1297922A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB5763569 1969-11-25

Publications (1)

Publication Number Publication Date
GB1297922A true GB1297922A (en) 1972-11-29

Family

ID=10479644

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1297922D Expired GB1297922A (en) 1969-11-25 1969-11-25

Country Status (1)

Country Link
GB (1) GB1297922A (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4156135A (en) * 1976-11-11 1979-05-22 The United States Of America As Represented By The Secretary Of The Army Electronic heterodyning in an optical detector
FR2470481A1 (en) * 1979-11-22 1981-05-29 Pophillat Lucien Frequency changer and photodetector - has modulated photodiode bias to reduce optical modulation frequency and match impedance
DE3244812A1 (en) * 1981-12-07 1983-06-16 The Secretary of State for Defence in Her Britannic Majesty's Government of the United Kingdom of Great Britain and Northern Ireland Whitehall, London METHOD AND DEVICE FOR PRELOADING PHOTO LADDER DETECTORS
EP0168914A1 (en) * 1984-06-14 1986-01-22 Stc Plc Optical transmission system
EP0318334A1 (en) * 1987-11-27 1989-05-31 BRITISH TELECOMMUNICATIONS public limited company Apparatus and method for converting a frequency division multiplex to a time division multiplex
AU606241B2 (en) * 1987-11-27 1991-01-31 British Telecommunications Public Limited Company Apparatus and method for converting a frequency division multiplex to a time division multiplex
EP0559102A1 (en) * 1992-03-03 1993-09-08 Advantest Corporation Frequency converter
US5406553A (en) * 1987-11-27 1995-04-11 British Telecommunications Public Limited Company Apparatus and method for converting a frequency division multiplex to a time division multiplex

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4156135A (en) * 1976-11-11 1979-05-22 The United States Of America As Represented By The Secretary Of The Army Electronic heterodyning in an optical detector
FR2470481A1 (en) * 1979-11-22 1981-05-29 Pophillat Lucien Frequency changer and photodetector - has modulated photodiode bias to reduce optical modulation frequency and match impedance
DE3244812A1 (en) * 1981-12-07 1983-06-16 The Secretary of State for Defence in Her Britannic Majesty's Government of the United Kingdom of Great Britain and Northern Ireland Whitehall, London METHOD AND DEVICE FOR PRELOADING PHOTO LADDER DETECTORS
EP0168914A1 (en) * 1984-06-14 1986-01-22 Stc Plc Optical transmission system
EP0318334A1 (en) * 1987-11-27 1989-05-31 BRITISH TELECOMMUNICATIONS public limited company Apparatus and method for converting a frequency division multiplex to a time division multiplex
WO1989005071A1 (en) * 1987-11-27 1989-06-01 British Telecommunications Public Limited Company Apparatus and method for converting a frequency division multiplex to a time division multiplex
AU606241B2 (en) * 1987-11-27 1991-01-31 British Telecommunications Public Limited Company Apparatus and method for converting a frequency division multiplex to a time division multiplex
US5406553A (en) * 1987-11-27 1995-04-11 British Telecommunications Public Limited Company Apparatus and method for converting a frequency division multiplex to a time division multiplex
EP0559102A1 (en) * 1992-03-03 1993-09-08 Advantest Corporation Frequency converter
US5352885A (en) * 1992-03-03 1994-10-04 Advantest Corporation Frequency converter for varying the frequency of a local signal over a wide band

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Legal Events

Date Code Title Description
PS Patent sealed
PLNP Patent lapsed through nonpayment of renewal fees