Single-mode germanosilicate-core optical fibers were fabricated by the MCVD process modified by sintering of the deposited soot in a reduced atmosphere (helium- or nitrogen- containing one). The fibers showed a higher photoinduced refractive index change and a higher efficiency of (chi) (2) formation as compared to an ordinary germanosilicate fiber. The sintering process in nitrogen and helium atmospheres was shown to increase the concentration of germanium oxygen-deficient centers. Besides, nitrogen appears to enter into the glass network in a sufficient concentration to modify the glass network and to additionally increase photosensitivity of the fibers.
Photorefractive effect and photoinduced χ(2)grating formation in germanosilicate core fibers codoped with nitrogen in MCVD process
Advances in Fiber Optics ; 2000 ; Moscow,Russian Federation
Proc. SPIE ; 4083
2000-05-17
Conference paper
Electronic Resource
English
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