CPC G02F 1/01708 (2013.01) [G02B 6/12004 (2013.01); G02F 1/025 (2013.01); H01S 5/0085 (2013.01); H01S 5/026 (2013.01); H01S 5/0265 (2013.01); H01S 5/101 (2013.01); G02F 1/0157 (2021.01); G02F 2202/102 (2013.01); G02F 2203/70 (2013.01); H01S 5/12 (2013.01); H01S 5/227 (2013.01); H01S 5/34306 (2013.01); H01S 5/50 (2013.01)] | 20 Claims |
1. A photonic chip, comprising:
a waveguide; and
an electro-absorption modulator comprising the waveguide,
the waveguide having:
a first end at a first edge of the photonic chip; and
a second end at the first edge of the photonic chip,
the waveguide having, at a point between the first end and the second end, a curvature having a magnitude greater than 5/mm, and
the waveguide having, everywhere between the first end and the second end, a rate of change of curvature having a magnitude not exceeding 2,000/mm2,
wherein:
the waveguide has a first facet at the first end, and a second facet at the second end;
the first facet is:
oblique to the waveguide at the first end, and
oblique to the first edge,
a fundamental mode of the waveguide at the first end corresponds to a first free space beam outside the first facet, the first free space beam having a first centerline;
a fundamental mode of the waveguide at the second end corresponds to a second free space beam outside the second facet, the second free space beam having a second centerline; and
the first centerline is within 10 degrees of being parallel to the second centerline.
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