The loss increase of the HE11 mode of a doubly clad (depressed-index) fiber due to constant curvature is considered. The calculations presented in this paper are based on a simplified theory. We find that for typical fibers the leakage loss of the HE11 mode begins to increase significantly when the radius of curvature of the fiber axis reaches the 1-10-cm range.
© 1982 Optical Society of America
Dietrich Marcuse, "Influence of curvature on the losses of doubly clad fibers," Appl. Opt. 21, 4208-4213 (1982)