Patent ID: 7251406
Filing Date: 2007-07-31
Classification: G02B

Abstract:
1. An optical device for transforming a waveguide mode from a first mode shape to a second mode shape, the device comprising: a single-mode waveguide comprising a guiding layer comprising a single material, the guiding layer configured to support a single optical mode at one end of the guiding layer and configured to support a single optical mode at an opposing end of the guiding layer, the guiding layer having a first width at an end of the guiding layer and a relatively lesser second width at an opposing end of the guiding layer for transforming a horizontal portion of the waveguide mode, the guiding layer comprising a lower guiding portion comprising the single material and having a first taper and an upper guiding portion comprising the single material and having a second taper, the upper guiding portion disposed on the lower guiding portion; and at least two wings disposed on opposing sides of the guiding layer and extending outwardly from the guiding layer to provide a rib waveguide cross-sectional shape to the guiding layer at the wings.