The observation of dopant diffusion during the tapering of high-birefringent fibers that increases with initial modal birefringence is reported. The resulting reduction in the core–cladding index difference is postulated to result in an increased taper transmission loss and is shown to correspond to increased 3-dB fused-coupler insertion loss.
© 1988 Optical Society of America
Original Manuscript: April 19, 1988
Manuscript Accepted: July 12, 1988
Published: October 1, 1988
C. W. Pickett, W. K. Burns, and C. A. Villarruel, "Dopant diffusion loss mechanism in high-birefringent-fiber fused couplers," Opt. Lett. 13, 835-837 (1988)