HIGH SBS THRESHOLD OPTICAL FIBER

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PROBLEM TO BE SOLVED : To provide an optical waveguide fiber having a high threshold for stimulated Brillouin scattering. SOLUTION : The optical fiber comprises : (a) a rare earth doped core having a refractive index profile and a centerline, the core including at least two adjacent core regions including different amounts of updopants, such that the longitudinal acoustic velocities in the two core regions differ by at least 0.2%; and (b) a cladding layer surrounding and directly adjacent the core. The fiber has MFD greater than 12 μm and delta % difference between the peak core delta and the cladding less than 0.3%. COPYRIGHT : (C)2013, JPO&INPIT