Experimental results indicate that the stress-induced strain birefringence in borosilicate elliptically clad fibers arises from the expansion coefficient mismatch between the borosilicate elliptical cladding and the pure silica outer jacket. This strain birefringence cannot be annealed even after repeated thermal cycling. It is shown that, for a given dopant concentration, the birefringence depends primarily on the cladding ellipticity ∊ and increases linearly with increasing ellipticity and expansion coefficient mismatch.
© 1979 Optical Society of America
Original Manuscript: July 5, 1979
Published: December 15, 1979
V. Ramaswamy, R. H. Stolen, M. D. Divino, and W. Pleibel, "Birefringence in elliptically clad borosilicate single-mode fibers," Appl. Opt. 18, 4080-4084 (1979)