FIBER BRAGG GRATINGS IN CHALCOGENIDE OR CHALCOHALID BASED INFRARED OPTICAL FIBERS

摘要

A reflective Bragg grating (21) in the interior of an infrared transmittingglass fiber (15), and its method comprising the steps of:producing first and second writing beams (11, 13) at the same wavelength;orienting the first and second writing beams (11, 13) in parallelwith respect to each other; crossing the first and second writing beams at apreselected angle with respect to each other to form aninterference pattern at the intersection of the first and second writing beams(11, 13); positioning the infrared transmitting glass fiber (15)at the intersection of the first and second writing beams (11, 13) so that theinterference pattern occurs along a portion of the length of theinfrared transmitting glass fiber (15); and maintaining the infraredtransmitting glass fiber (15) at the intersection of the first and secondwriting beams (11, 13) for a time sufficient to produce a Bragg grating (21)in the core and cladding of the infrared transmitting glass fiber(15).