US 11,728,622 B2
Single-facet, variable-confinement optical waveguide amplifier
Dominic F. Siriani, Allentown, PA (US); Vipulkumar K. Patel, Breinigsville, PA (US); Matthew J. Traverso, Santa Clara, CA (US); and Mark A. Webster, Bethlehem, PA (US)
Assigned to Cisco Technology, Inc., San Jose, CA (US)
Filed by Cisco Technology, Inc., San Jose, CA (US)
Filed on Mar. 1, 2019, as Appl. No. 16/290,698.
Prior Publication US 2020/0280171 A1, Sep. 3, 2020
Int. Cl. H01S 5/10 (2021.01); H01S 5/34 (2006.01); H01S 5/50 (2006.01); H01S 5/22 (2006.01); H01S 5/14 (2006.01)
CPC H01S 5/101 (2013.01) [H01S 5/1003 (2013.01); H01S 5/1014 (2013.01); H01S 5/22 (2013.01); H01S 5/34 (2013.01); H01S 5/341 (2013.01); H01S 5/50 (2013.01); H01S 5/1025 (2013.01); H01S 5/146 (2013.01)] 15 Claims
OG exemplary drawing
 
1. An optical apparatus comprising:
a semiconductor substrate; and
an optical waveguide emitter comprising:
an input waveguide section extending from a facet of the semiconductor substrate;
a first transition waveguide section optically coupled to the input waveguide section;
a turning waveguide section optically coupled with the first transition waveguide section;
a second transition waveguide section optically coupled to the turning waveguide section; and
an output waveguide section extending to the facet and optically coupled with the second transition waveguide section, wherein a waveguide layer and an optically active region positioned on the waveguide layer extend through the input waveguide section, the first transition waveguide section, the turning waveguide section, the second transition waveguide section, and the output waveguide section, wherein a mode conversion layer is positioned on the optically active region in the first transition waveguide section, the turning waveguide section, and the second transition waveguide section such that the optically active region is positioned between the waveguide layer and the mode conversion layer, and wherein the mode conversion layer has a higher refractive index than the waveguide layer.