CPC G02B 6/2746 (2013.01) [G02B 6/1228 (2013.01); G02F 1/093 (2013.01); G02B 2006/1215 (2013.01); G02B 6/126 (2013.01)] | 17 Claims |
1. A device comprising:
a laser configured to emit light;
a first splitter comprising:
a first coupler configured to receive light from the laser at a first port and split light received at the first port into a first waveguide and a second waveguide;
a second coupler configured to:
receive light from the first waveguide and from the second waveguide; and
transmit light received from the first coupler by the first waveguide and
the second waveguide to propagate along a first path and along a second path;
the first waveguide; and
the second waveguide;
a second splitter configured to:
receive light from the first path and from the second path; and
combine light received from the first path and from the second path to exit a second port;
a first non-reciprocal polarization rotator in the first path between the first splitter and the second splitter;
a first reciprocal polarization rotator in the first path between the first splitter and the second splitter;
a second non-reciprocal polarization rotator in the second path between the first splitter and the second splitter;
a second reciprocal polarization rotator in the second path between the first splitter and the second splitter; and
a semiconductor substrate, wherein the laser, the first coupler, the second coupler, the first waveguide, the second waveguide, the second splitter, the first non-reciprocal polarization rotator, the first reciprocal polarization rotator, the second non-reciprocal polarization rotator, and the second reciprocal polarization rotator are integrated on the semiconductor substrate, wherein:
the first waveguide has a maximum cross-sectional width that is less than a maximum cross-sectional width of the second waveguide;
the maximum cross-sectional width of the first waveguide and the maximum cross-sectional width of the second waveguide are measured in a direction orthogonal to a direction of beam propagation and halfway between the first coupler and the second coupler; and
the maximum cross-sectional width of the first waveguide is less than a height of the first waveguide.
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