Modal field deformation and transition losses in UV side-written optical fibers

Abstract

The asymmetry of the UV-induced refractive-index profile in photosensitive optical fibers causes a deformation of the modal fields, resulting in transition losses between UV-exposed and unexposed fiber sections up to 0.1 dB for UV-induced index changes of the order of ≤10^-2. A numerical analysis of the transition losses is developed. It is verified experimentally that the loss is caused by coupling of power of the fundamental mode to cladding modes at such a transition.

© 2000 Optical Society of America

Effective-index increase, form birefringence and transition losses in UV-side-illuminated photosensitive fibers

Hagen Renner
Opt. Express 9(11) 546-560 (2001)

Annealing properties of gratings written into UV-presensitized hydrogen-outdiffused optical fiber

M. Åslund and J. Canning
Opt. Lett. 25(10) 692-694 (2000)

Increase of photosensitivity in Ge-doped fibers under strain

E. Salik, D. S. Starodubov, and J. Feinberg
Opt. Lett. 25(16) 1147-1149 (2000)

Modes of UV-written planar waveguides

Hagen Renner
Opt. Lett. 23(2) 111-113 (1998)

Theoretical and experimental evaluation of the modal field shift and the associated transition loss in perturbed index-profile single-mode optical fiber with application of Fizeau interferometry

Fouad El-Diasty
J. Opt. Soc. Am. A 21(8) 1496-1502 (2004)