Output power monitoring in an optical preamplifier
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United States of America Patent
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Issued Date -
Apr 17, 2003
app pub date -
Oct 16, 2002
filing date -
Oct 17, 2001
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
Tapless output power monitoring is used when amplifying and converting an optical signal to an electrical signal, e.g., in a communications receiver of an optical transmission system. An optical preamplifier amplifies an intensity-modulated optical input signal to produce an amplified intensity-modulated optical signal. An optical-to-electrical (O-E) converter demodulates and converts the amplified intensity-modulated optical signal into an electrical output signal. A current monitor monitors a DC bias current of the optical-to-electrical (O-E) converter and produces a feedback signal proportional to the DC bias current. The optical preamplifier adjusts the gain of the amplified optical signal based on the feedback signal.
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