FIBER AMPLIFIER

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PROBLEM TO BE SOLVED : To provide a fiber amplifier efficiently taking out an energy excited by the fiber. SOLUTION : The fiber amplifier comprises the fiber with a rare earth element added to its core, a first excitation light source for generating a first excitation light entered into one end part of the fiber, and a second exciation light source for generating a second excitation light entered into the other end part of the fiber. The absorption coefficient of the rare earth element in a wavelength of the second exciation light is larger than that in a wavelength of the first excitaion light, and a signal light entering into the one end part is amplified by the rare earth element excited by the first and the second excitation light, and emitted from the other end part. COPYRIGHT : (C)2008, JPO&INPIT