BROADBAND FIBER LIGHT SOURCE WITH HIGH WAVELENGTH STABILITY UNDER RADIATION IN IFOG APPLICATIONS

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PROBLEM TO BE SOLVED : To provide a broadband fiber light source with high wavelength stability under radiation in IFOG applications. SOLUTION : A rare earth doped fiber light source with wavelength stability includes : a rare earth doped fiber and a non-doped fiber which are disposed proximately to each other and have the same host material and the same sectional structure; a coupler configured to direct a first portion of pump power from a pump laser toward the non-doped fiber in such a manner that the first portion of the pump power twice passes through the coupler; and a wavelength division multiplexer configured to input a second portion of the pump power from the pump laser to the rare earth doped fiber. The rare earth doped fiber is an active medium for a broadband light source and contains a fiber core obtained by doping a rare earth ion. The non-doped fiber includes a rare earth dopant-free fiber core. A length of the non-doped fiber is equal to that of the doped fiber or optimized so as to be matched with radiation sensitivity of the doped fiber. COPYRIGHT : (C)2014, JPO&INPIT