Patent ID: 6292291
Filing Date: 2001-09-18
Classification: H01S,H04B

Abstract:
An optical fiber amplifier having constant output power for each channel comprising:a first measuring unit for dividing an input light signal into a first light signal and a second light signal, sub-dividing the first light signal into a plurality of light signals and converting the plurality of light signals into electrical signals to output the electrical signals;an optical fiber amplifying unit for amplifying, the second light signal according to a predetermined amplification control value;a second measuring unit for converting a light signal of a predetermined wavelength band, output from the optical fiber amplifying unit, into an electrical signal; andan output power controller for controlling the predetermined amplification control value according to a plurality of output values of the first measuring unit and an output value of the second measuring unit, so that the power level of the optical fiber amplifying unit is maintained at a constant level, wherein the first measuring unit comprises:a first light divider for dividing the input light signal into said first and second light signals;a second light divider in which said first light signal is sub-divided into said plurality of light signals;a plurality of loss inducing means having asymmetric loss inducing characteristics along a wavelength axis characterized in that each said loss inducing means induces a different loss characteristics to respective ones of said plurality of light signals output from the second light divider according to respective wavelengths of each of the plurality of light signals; anda plurality of light receiving elements for converting the output signals of the plurality of loss inducing means into electrical signals and outputting the electrical signals to the output power controller.