Abstract

Waveguide bends are essential elements in the design of integrated optical devices. Various bend configurations have been studied mostly for titanium-indiffused lithium niobate waveguides [1] – [4] . Among them, S-shaped bends as shown in figure (la) have been widely used in integrated optical devices. The main goal of waveguide bend studies has been to achieve the minimum transition length that can be tolerated for acceptably low bend loss. Losses as low as 0.2 dB have been reported [4] in titanium-indiffused waveguides for a transition between offset parallel waveguides with a 0.1 mm lateral and 3.25 mm longitudinal separation. Here we report on very-low-loss PE:LiNbO₃ waveguide bend structures at λ = 1.55 um.

© 1992 Optical Society of America