Dopant diffusion loss mechanism in high-birefringent-fiber fused couplers.
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.
Pickett
C W
CW
Burns
W K
WK
Villarruel
C A
CA