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IEEE Journal of Lightwave Technology
Volume 18 Number 10, October 2000

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Very Large Temperature-Induced Absorptive Loss in High Te-Containing Chalcogenide Fibers

Vinh Q. Nguyen, Jas S. Sanghera, Frederic H. Kung, Pablo C. Pureza and Ishwar D. Aggarwal

Page 1395.

Abstract:

The change in the absorption loss relative to room temperature of the infrared (IR)-transmitting Ge15As35Se(50-x)Tex glass fibers in the temperature range of 110°C <= T <= 110°C was investigated. The attenuation in-creased significantly at T >= 40°C. This is mainly attributed to thermally activated free carriers associated with the semimetallic character of the Te atom. For <= 4.2 µm,the loss due to electronic and free-carrier absorption was strongly affected by temperature. In the wavelength region of 5-11 µm, the loss was mainly due to free-carrier absorption. Beyond >= 11 µm, multiphonon absorption dominated the loss spectrum at T <= 60°C while free-carrier absorption contributed mainly to the total loss at T >= 80°C.

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