Birefringence reduction in side-written photoinduced fiber devices by a dual-exposure method.
An in situ birefringence measurement in conjunction with an atomic force microscope study shows that the geometric asymmetry of the side-writing process is a major cause of the induced birefringence in grating-based fiber devices. Measured refractive-index profiles of UV-exposed fibers clearly show the asymmetry in the induced index change. We demonstrate the use of a dual-exposure technique for producing low-birefringence devices.
A M
AM
Vengsarkar
Q
Q
Zhong
D
D
Inniss
W A
WA
Reed
P J
PJ
Lemaire
S G
SG
Kosinski