Patent ID: 8184936

Claim:
A bending resistant multimode fiber, comprising a core and a cladding, wherein said core has a radius (R 1 ) of 24-26 μm, the refractive index profile thereof is a parabola (α=1.9-2.2), and the maximum relative refractive index difference (Δ1) is 0.9-1.1%; said cladding surrounds said core and comprises from inside to outside an inner cladding, a middle cladding, and an outer cladding; a radius (R 2 ) of said inner cladding is 1.04-1.6 times that of said core, and a relative refractive index difference (Δ2) thereof is −0.01-0.01%; said middle cladding is a graded refractive index cladding whose radius (R 3 ) is 1.06-1.8 times that of said core, and a relative refractive index difference thereof is decreased from Δ2 to Δ4; and a radius (R 4 ) of said outer cladding is 2.38-2.63 times that of said core, and a relative refractive index difference (Δ4) thereof is between −0.20 and −0.40%.