| 摘要 |
PROBLEM TO BE SOLVED: To realize continuous gain control while realizing polarization independent amplification characteristics. SOLUTION: The optical amplifier unit comprises a Mach-Zehnder interferometer 1 consisting of an input side coupler 9, an output side coupler 10, and a pair of arms 11 and 12 connecting the input side coupler and the output side coupler, first and second optical amplifiers 2 and 3 provided, respectively, in the pair of arms and amplifying signal light, and a light source 4 for control light outputting control light wherein the first and second optical amplifiers are arranged to have polarization independent characteristics, and the light source for control light is arranged to have predetermined inter-polarization gain difference or inter-polarization loss difference. COPYRIGHT: (C)2006,JPO&NCIPI
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