Patent ID: 6337764
Filing Date: 2002-01-08
Classification: H01S,H04B

Abstract:
An optical fiber amplifier for controlling gain flatness comprising:a first measuring unit for measuring the power level of an input light signal; an optical fiber amplifying unit for amplifying a light signal, output from said first measuring unit, according to a predetermined amplification control value; a second measuring unit for measuring the power level of amplified spontaneous emission within two predetermined wavelength bands output from the optical fiber amplifying unit, said two predetermined wavelength bands comprising: a short-wavelength region outside a wavelength region in which any signal channels exist, and a long-wavelength region outside said wavelength region in which any signal channel exists; and a gain controller for obtaining gain characteristics of an output signal light of the optical fiber amplifying unit according to the measured power level of said input light signal, and for controlling the amplification control value of the optical fiber amplifying unit according to the measured power level of the amplified spontaneous emission to flatten the gain of the optical fiber amplifying unit.