SYSTEM AND METHOD FOR LOW LOSS WAVEGUIDE BENDS

摘要

In one embodiment, there is disclosed a waveguide medium (20) using total internal reflection to create a relatively sharp (approximately 90°) bend for optical signals traversing the waveguide. A discontinuity (21) of the medium (such as air) is used to create a turning mirror within the waveguide path (12, 13). By curving the discontinuity, the entire input optical signal is focused into the output portion (13) of the waveguide, thereby compensating for the diffraction loss of the optical signal at the bend. In one embodiment in order to facilitate proper alignment of the masks certain portions of the waveguide on a first mask are extended (widened) beyond their optimum physical size. This extended portion is then used to position an edge of a second mask, such that optical signal scatter caused by the extended portions of the waveguide are compensated for by adjusting the curvature.