Ultra Low Microdeformation Loss Predictions in Single Mode Fibers at Long Wavelengths

12 May 1986

proceedings article
Published by SPIE-Intl Soc Optical Eng

Vol. 618, 10-16
https://doi.org/10.1117/12.961087

Abstract

Extrinsic losses in long wavelength glass fibers (2-10 µm), which are related to the waveguide structure, must be reduced to ultra low levels to utilize the intrinsic low loss levels(10-3-10-2 dB/km). Two important loss mechanisms are microdeformation (microscopic bends and core diameter fluctuations) and radiative loss due to macrobending. Using a coupled mode and a spotsize theory, microdeformation losses are calculated for single mode, dispersion shifted, heavy metal halide glass fibers. Very low microdeformation losses can be achieved with modest values of the refractive index difference at long wavelengths for short to intermediate perturbation correlation lengths. For long correlation lengths it may be difficult to achieve very low losses at wavelengths > 3 microns. The macrobending loss calculation results determine the lower limit of the refractive index differences.© (1986) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.

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