Bending resistant multimode optical fiber with reduced leakage mode effects

摘要

A multimode optical fiber is provides, which includes an optical core and an optical cladding surrounding the optical core. The optical core has a refractive graded-index profile. The optical cladding includes: an inner layer surrounding the optical core, an intermediate layer, called a depressed trench, surrounding the inner layer, and an outer layer surrounding the depressed trench and having a constant refractive index. The depressed trench has a width W and a negative refractive index difference nt with respect to the outer layer, and is designed so as to satisfy the following inequality: |0.585677114.681×S+13.7287×S2+18.7343×S×W4.61112×S×nt·1030.913789×W×nt·103|+2×W×nt·10330 wherein: S is the width of the inner cladding, which is included between 0.6 m and 1.6 m; nt is included between 11.103 and 4.103; and W×nt·103 is lower than 25 m.