Based on the exact scalar wave equations of bent slab waveguides, locally leaky-mode attenuation constants for both TE and TM modes are derived by using the WKB tunneling theory. Changes in propagation constant due to waveguide bending are considered in our calculation. Under some assumptions, our results are found to be identical to other results obtained using entirely different methods.
© 1989 Optical Society of America
Y. H. Cheng and W. G. Lin, "Radiation loss in bent step-index slab waveguides," Opt. Lett. 14, 1231-1233 (1989)