Patent ID: 6901197
Filing Date: 2005-05-31
Classification: C03C,G02B

Abstract:
1. An optical fiber comprising a core, an inner cladding surrounding the core, and an outer cladding surrounding the inner cladding, wherein the core is a first main medium having a refractive index n the inner cladding, for at least a portion of the fiber, comprises a second main medium having a refractive index n the outer cladding is a third main medium having a refractive index n said core, inner cladding, outer cladding and sub medium regions extending along a fiber axis; a bending loss of a fundamental mode of the fiber at a wavelength λ is lower than 0.1 dB/m at a bending diameter of 15 mm; a mode-field diameter of the fundamental mode at an end portion of the fiber at the wavelength λ is between 8.0 μm and 50 λ; and a bending loss of a first higher-order mode at the wavelength λ is higher than 1 dB/m at a bending diameter of 30 mm.