Coherent optical detector having a multifunctional waveguide grating
First Claim
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1. An apparatus, comprising:
- a first waveguide grating;
a first plurality of waveguides connected to the first waveguide grating, wherein;
the first plurality comprises a first waveguide and a second waveguide collinear with the first waveguide at the first waveguide grating; and
the first waveguide grating is configured to split optical power of a first polarization of a first optical signal applied to the first waveguide grating and couple the optical power of the first polarization of the first optical signal into the first and second waveguides; and
a first optical coupler, wherein;
the first and second waveguides are connected to a first side of the first optical coupler;
the first waveguide has a first length between the first waveguide grating and the first optical coupler; and
the second waveguide has a second length between the first waveguide grating and the first optical coupler, the second length being different from the first length.
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Abstract
A coherent optical detector having a waveguide circuit, in which a plurality of waveguides are connected to a waveguide grating. In a representative embodiment, the waveguide grating serves at least three different functions, e.g., those of a fiber-optic coupler, a polarization splitter, and two power splitters, one for each of two orthogonal polarizations. Various embodiments of the coherent optical detector can be used to demodulate various forms of polarization-division-multiplexed (PDM) QAM- and/or PSK-modulated optical communication signals.
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Citations
19 Claims
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1. An apparatus, comprising:
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a first waveguide grating; a first plurality of waveguides connected to the first waveguide grating, wherein; the first plurality comprises a first waveguide and a second waveguide collinear with the first waveguide at the first waveguide grating; and the first waveguide grating is configured to split optical power of a first polarization of a first optical signal applied to the first waveguide grating and couple the optical power of the first polarization of the first optical signal into the first and second waveguides; and a first optical coupler, wherein; the first and second waveguides are connected to a first side of the first optical coupler; the first waveguide has a first length between the first waveguide grating and the first optical coupler; and the second waveguide has a second length between the first waveguide grating and the first optical coupler, the second length being different from the first length. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. An apparatus comprising:
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a first waveguide grating; a first plurality of waveguides connected to the first waveguide grating, wherein; the first plurality comprises a first waveguide and a second waveguide collinear with the first waveguide at the first waveguide grating; and the first waveguide grating is configured to split optical power of a first polarization of a first optical signal applied to the first waveguide grating and couple the optical power of the first polarization of the first optical signal into the first and second waveguides; a second waveguide grating; and a second plurality of waveguides connected to the second waveguide grating, wherein; the second plurality comprises a first waveguide and a second waveguide collinear with the first waveguide at the second waveguide grating; and the second waveguide grating is configured to split optical power of the first polarization of a second optical signal applied to the second waveguide grating and couple the optical power of the first polarization of the second optical signal into the first and second waveguides of the second plurality. - View Dependent Claims (16, 17, 18, 19)
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Specification