Optical communication system
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United States of America Patent
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-
Feb 20, 2001
Grant Date -
N/A
app pub date -
Sep 2, 1997
filing date -
Apr 1, 1994
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A high speed optical receiver for receiving a substantially diminished optical signal. An optical amplifier amplifies the diminished optical signal at least several db and an ultra narrow-band filter filters the noise generated in the optical amplifier to produce a filtered amplified optical signal which is detected by a fast response photo detector. In a preferred embodiment the optical amplifier is a semiconductor laser amplifier. In this embodiment a Faraday filter provides the ultra narrow-band filtering, virtually eliminating the noise produced by the amplifier. Transmitters are described for transmitting information at a wavelength tuned to the ultra narrow-band filters.
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