Parameters affecting bending losses in graded-index polymer opticalfibers

摘要

Radiation losses that occur when bending graded-index polymernoptical fibers (POFs) are analyzed as a function of the profilenexponent, the light wavelength, the fiber core radius, and the length ofnthe bent section. For this purpose, a ray-tracing model is used, whichncombines both the generalized Fresnel power transmission coefficientsnfor curved graded-index media and the differential equations that governnthe ray paths in highly multimode graded-index fibers. This model isnapplied to the most recent types of graded-index POF, for which thenchoice of the core radius and profile exponent is discussed from thenpoint of view of bending losses (the greater the profile exponent andnthe core radius, the greater the bending losses). The influence ofnprofile exponents different from two is included for the firstntime