| 摘要 |
In the optical amplifier (200) of the present invention, a part of signal light inputted to an input connector (201) is branched out by an optical coupler (211), whereby its power is detected by a light-receiving device (241). According to the power of input signal light detected by the light- receiving device, the temperature of an amplification optical fiber (231) is controlled by a temperature control section (261) by way of a Peltier device (233). On the other hand, a part of the signal light outputted from an outpu t connector (202) is branched out by an optical coupler (214), whereby its pow er is detected by a light-receiving device (242). A gain is determined from the ratio between the input signal light power and the output signal light power and the temperature of the amplification fiber is controlled according to th is gain. Besides, the power of pumping light supplied to the amplification optical fiber from a pumping light source (252) is controlled by an output control section (262) such that the power of output signal light detected by the light-receiving device becomes a predetermined target value.
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