Patent ID: 6353496
Filing Date: 2002-03-05
Classification: H01S,H04B

Abstract:
A wavelength division multiplexing erbium doped fiber amplifier (WDM-EDFA) having constant output power per channel, which amplifies received signal light of a plurality of channels which are multiplexed, the WDM-EDFA comprising:a power control unit for generating dummy light whose output power is controlled according to a first control value, and controlling the power of received signal light by coupling the dummy light to the received signal light; an optical fiber amplification unit for amplifying signal light power-controlled by the power control unit, using pumping light generated according to a second control value; and a controller for supplying the first control value to the power control unit to obtain dummy light power corresponding to the difference between the power value of the received signal light and a predetermined target power value, and supplying the second control value to the optical fiber amplification unit to obtain pumping light power required to amplify the received signal light.