Experimental Investigation Of The Optical Fibers Bending Loss Under Different Bending Radii

Ong, Choon Seng (2019) Experimental Investigation Of The Optical Fibers Bending Loss Under Different Bending Radii. Project Report. UTeM, Melaka. (Submitted)

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Abstract

Optical fiber is a type of cabling technology that is used to transmit data via propagation and reflection of light inside a transparent core made by very thin plastic strands or silica glass. It has higher efficiency and higher bandwidth than electrical cable. It is also immune to electromagnetic interference which is the cause of power loss in the electrical cable. However, during the transmission, bending of fiber can cause attenuation which in the end reduce the signal quality due to bending loss. In this project, the effect of bending loss was investigated to see the effect on transmission link. The experiment was conducted based on the radius of bending curvature in optical fiber for SMF and MMF. Bending radius range from 3 mm to 15 mm was set. Power loss with respect to each radius of bending curvature was evaluate, and then the experimental result is compared to the theoretical result. The percentage difference between theory and practical is about 75%. In theoretical result, the critical bending radius of SMF is around 4 mm and approximate 5 μm for MMF. In conclusion, MMF is highly immune to the bend loss due to it has higher number of modes than SMF which provides more light rays propagate at the same time.

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