OPTISCHER UEBERLAGERUNGSEMPFAENGER MIT DREIFACHFASERKOPPLER

In a conventional optical heterodyne receiver with a standard six- port fibre coupler, a loss of sensitivity occurs compared with an optical heterodyne receiver with a 90 DEG hybrid and, furthermore, laser amplitude noise is inadequately suppressed. Therefore, according to the invention, the receive...

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Bibliographic Details
Main Author PIETZSCH, JOACHIM
Format Patent
LanguageGerman
Published 15.11.1992
Edition5
Subjects
CONTROLLING
ELECTRIC COMMUNICATION TECHNIQUE
ELECTRICITY
MULTIPLEX COMMUNICATION
PHYSICS
REGULATING
SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
TRANSMISSION
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Summary:In a conventional optical heterodyne receiver with a standard six- port fibre coupler, a loss of sensitivity occurs compared with an optical heterodyne receiver with a 90 DEG hybrid and, furthermore, laser amplitude noise is inadequately suppressed. Therefore, according to the invention, the receiver with a six-port fibre coupler (K) is designed as a pair of balanced receivers, so that the photocurrent amplifiers connected behind the photodiodes (PD1, PD2, PD3), through suppression of the DC components in the photocurrent, receive only the differences in current between the photocurrents of in each case two photodiodes.
Bibliography:Application Number: AT19880114208T