Photoelectric conversion method, light receiving circuit, and optical communication system
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United States of America Patent
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Aug 17, 2004
Grant Date -
Sep 5, 2002
app pub date -
Feb 15, 2002
filing date -
Nov 28, 1997
priority date (Note) -
Expired
status (Latency Note)
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Abstract
There is disclosed a photoelectric conversion method, a light receiving circuit, and an optical communication system, in which even if an average received light level varies, a constant output level of demodulated signal can always be obtained. In the photoelectric conversion method, the light receiving circuit and the optical communication system of the present invention, a light signal is received by a light receiving diode and converted to an electric signal. An alternating component is removed and a direct current component is taken out by a low-pass filter to detect an average received light level of the light, a difference of the average received light level and a preset reference voltage is amplified by a differential amplifier to output a control voltage of a variable gain amplifier, and the electric signal is amplified with a gain corresponding to the control voltage by the variable gain amplifier to obtain a demodulated signal.
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