Optical: systems and elements – Optical amplifier – Optical fiber
Patent
1997-12-09
1999-12-28
Hellner, Mark
Optical: systems and elements
Optical amplifier
Optical fiber
359134, H01S 300
Patent
active
060089350
ABSTRACT:
An optical amplifier for amplifying and outputting an input light signal, comprises an optical light amplifier unit (10), a tunable wavelength filter (30), a signal light detection unit, and a control circuit (100). The optical amplifier unit (10) amplifies the input light signal and outputs an amplified light signal. The tunable wavelength filter (30), into which the amplified light signal is inputted and which transmission light wavelength is swept, outputs a filter output signal. The signal light detection unit detects a signal light level of an amplified output component in the amplified light signal in response to said input light signal. The control circuit (100) controls a gain of said optical amplifier unit based on the signal light level. Further, the signal light detection unit of the optical amplifier according to the present invention comprises a peak detection unit (60) and a background light detection unit (70). The peak detection unit (60) detects a peak light level of the filter output signal. The background light detection unit (70) detects a background light level of the filter output signal.
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Fujita Masayuki
Saeki Miwa
Hellner Mark
NEC Corporation
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