OPTICAL AMPLIFICATION FIBER, OPTICAL FIBER AMPLIFIER, AND OPTICAL COMMUNICATION SYSTEM

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PROBLEM TO BE SOLVED : To decrease the noise figure while keeping a high absorption coefficient at a signal light wavelength band. SOLUTION : Each of the optical amplification fibers 11, 12, 13 with a W-seg type refractive index profile comprises : a core located in the center of the fiber and to which a rare earth element (e.g., Erbium, but another rare earth element may be usable) is uniformly doped (core with uniform doping density of rare earth element); a first clad for surrounding the core; and a second clad for surrounding the first clad. COPYRIGHT : (C)2006, JPO&NCIPI