Design and analysis of multimode fiber with high bend tolerance and bandwidth using restricted mode launch

This paper presents a multimode optical fiber design that has high tolerance to bending. Average bending loss per mode for a standard 50 μm graded index multimode fiber is 8.06E+08 dB/km for a bending radius of 1.25mm and particularly for fundamental mode it is 2.18E+02 dB/km. Whereas, simulation results show that average bending loss per mode in the case of the proposed bend insensitive multimode fiber for a bending radius of 1.25mm is about 2.67E-11 dB/km and particularly for the fundamental mode it is 1.96E-32 dB/km only. It is also observed that the proposed design is consistent with standard 50 μm graded index multimode fiber in terms of bandwidth and interconnectivity. Thus both can be spliced with the proposed design in the bending section.