Importance

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Abstract

The present disclosure describes an electronic circuit for use as a receiver in digital fiber-optic systems. It is the nature of such systems that considerable amplification is required at the receiving terminus to bring to useful signal levels the electrical energy provided by photodetectors in response to the light incident thereupon. However, the photodetectors and amplifiers themselves contribute noise currents which vary with temperature and operational amplifiers have a characteristic initial dc offset. Accordingly, while receivers for fiber-optic systems have been complicated and expensive, the receiver of the present invention is neither of these. It amplifies the small signals from the photodetector to a suitable level, eliminates the effects of the aforementioned dc offset, rejects any long-term drift and provides output signals of any duration from a bistable stage, which signals correspond to the original digital information transmitted by the system.

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First Claim