Abstract

The study of waveguide-crossings is important in the design of integrated optic (IO) components and in the integration of IO circuits. Authors of [2] have employed the beam propagating method (BPM) in the analysis of "Δn" and "2Δn” type passive crossings at small angles (θ <4°) and with small index variation Δn. The BPM neglects reflection and simulates wave propagation in a forward sense, thus it cannot analyze structures with large geometry and material discontinuities or in situation when reflections add up coherently.

© 1989 Optical Society of America