Patent ID: 7421174
Filing Date: 2008-09-02
Classification: C03B,C03C,G02B

Abstract:
1. A multimode optical fiber comprising: a multilayered silicate glass core region having a refractive index profile shape parameter for broadband operation at wavelengths in the approximate range of 0.78 to 1.55 μm, and a cladding region adjacent said core region, said core and cladding regions being configured to have an NA of about 0.2 and to support the simultaneous propagation of optical radiation in said core region at at least two wavelengths within said range, said core region being co-doped with aluminum oxide, phosphorous oxide, germanium oxide and fluorine, the concentrations and distribution of said co-dopants being radially varied so that the refractive index of said core region is radially graded and so that the optimum profile shape parameter of said fiber is essentially independent of wavelength within said range.