Gain controller with selectable wavelength feedback
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United States of America Patent
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Issued Date -
May 26, 2005
app pub date -
Nov 24, 2003
filing date -
Nov 24, 2003
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A gain controller has a tunable filter, a power detector and a filter controlling unit. The amplifier is connected in series in a major optical channel. The tunable filter is connected in parallel to the major optical channel to select a specific light signal from an output terminal of the amplifier and then output the specific light signal to the input terminal of the amplifier. The power detector and filter controlling unit is connected between an input terminal of the amplifier and the tunable filter to control the tunable filter output. The tunable filter outputs a light signal to the input terminal of the amplifier to maintain the input power of the amplifier. Therefore, gain of each light signal from the output terminal of the amplifier can be kept in a valuable range.
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