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Optica Publishing Group
  • Journal of Lightwave Technology
  • Vol. 18,
  • Issue 10,
  • pp. 1395-
  • (2000)

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

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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 110C <= T <= 110C was investigated. The attenuation in-creased significantly at T >= 40C. This is mainly attributed to thermally activated free carriers associated with the semimetallic character of the Te atom. For <= 4.2 m,the loss due to electronic and free-carrier absorption was strongly affected by temperature. In the wavelength region of 5-11 m, the loss was mainly due to free-carrier absorption. Beyond >= 11 m, multiphonon absorption dominated the loss spectrum at T <= 60C while free-carrier absorption contributed mainly to the total loss at T >= 80C.

© 2000 IEEE

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