Title :
Very large temperature-induced absorptive loss in high Te-containing chalcogenide fibers
Author :
Nguyen, Vinh Q. ; Sanghera, Jas S. ; Kung, Frederic H. ; Pureza, Pablo C. ; Aggarwal, Ishwar D.
Author_Institution :
Div. of Opt. Sci., Naval Res. Lab., Washington, DC, USA
Abstract :
The change in the absorption loss relative to room temperature of the infrared (IR)-transmitting Ge/sub 15/As/sub 35/Se/sub (50-x)/Te/sub x/ glass fibers in the temperature range of -110/spl deg/C/spl les/T/spl les/110/spl deg/C was investigated. The attenuation increased significantly at T/spl ges/40/spl deg/C. This is mainly attributed to thermally activated free carriers associated with the semimetallic character of the Te atom. For /spl lambda//spl les/4.2 /spl mu/m, the loss due to electronic and free-carrier absorption was strongly affected by temperature. In the wavelength region of 5-11 /spl mu/m, the loss was mainly due to free-carrier absorption. Beyond /spl lambda//spl ges/11 /spl mu/m, multiphonon absorption dominated the loss spectrum at T/spl les/60/spl deg/C while free-carrier absorption contributed mainly to the total loss at T/spl ges/80/spl deg/C.
Keywords :
chalcogenide glasses; light absorption; optical fibre fabrication; optical fibre losses; tellurium; thermo-optical effects; -110 to 110 C; 4.2 mum; 40 C; 5 to 11 mum; 60 C; 80 C; GeAsSeTe; IR transmitting fibres; IR-transmitting Ge/sub 15/As/sub 35/Se/sub (50-x)/Te/sub x/ glass fibers; Te atom; absorption loss; electronic absorption; free-carrier absorption; high Te-containing chalcogenide fibers; loss spectrum; multiphonon absorption; room temperature; semimetallic character; temperature range; thermally activated free carriers; total loss; very large temperature-induced absorptive loss; Electromagnetic wave absorption; Glass; Optical fiber losses; Optical fiber sensors; Optical fibers; Optical network units; Optical sensors; Optical surface waves; Tellurium; Temperature distribution;
Journal_Title :
Lightwave Technology, Journal of
