BENDING-RESISTANT LARGE CORE DIAMETER HIGH NUMERICAL APERTURE MULTIMODE FIBER

摘要

Disclosed is a bending-resistant large core diameter high numerical aperture multimode fiber, comprising a core and a cladding which coats the core. The radius R1 of the core is 28 to 50 microns; a refractive index section of the core has a parabola shape; the distribution index a is 1.9 to 2.2, and the maximum relative refractivity difference ?1%max is 1.9% to 2.5%; and the cladding outside the core comprises an inner cladding and/or a sunken inner cladding, and an outer cladding in sequence from the inside out. The radius R2 of the inner cladding is 28 to 55 microns, and the relative refractivity difference ?2% is -0.1% to 0.1%. The radius R3 of the sunken inner cladding is 28 to 60 microns, and the relative refractivity difference ?3% is -0.15% to -0.8%. The bandwidth and the numerical aperture of the bending-resistant large core diameter high numerical aperture multimode fiber are increased, so that the light gathering capacity of the fiber is improved greatly and the multimode fiber is easier to be coupled to an LED light source. The macro bending attached attenuation of the fiber is reduced obviously, the bending resistance performance of the fiber is improved, and the optical power transmission performance is enhanced.