The UV-induced refractive-index increase in photosensitive planar waveguides is modeled by an exponential profile. Closed-form field solutions are given and dispersion curves are calculated for TE and TM modes. Modes in air-covered waveguides can be less sensitive to the UV-written profile than modes in buried waveguides.
© 1998 Optical Society of America
Hagen Renner, "Modes of UV-written planar waveguides," Opt. Lett. 23, 111-113 (1998)