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US 8,712,256 B2Granted
Monolithic widely-tunable coherent receiver
AssigneeFreedom Photonics LLC
InventorsJonathon Barton, Milan Mashanovitch
Life of this patent
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Abstract
Various embodiments of a coherent receiver including a widely tunable local oscillator laser are described herein. In some embodiments, the coherent receiver can be integrated with waveguides, optical splitters and detectors to form a monolithic optical hetero/homodyne receiver. In some embodiments, the coherent receiver can demodulate the full phase information in two polarizations of a received optical signal over a range of optical wavelengths.
Claims10
A monolithically integrated optical receiver comprising:
- at least one monocrystalline substrate;
- a tunable laser resonator monolithically integrated with the substrate;
- a first optical mixer monolithically integrated with the substrate, the first optical mixer having a first and a second input waveguide, a plurality of output waveguides and at least one turning mirror disposed with respect to one of the input or the output waveguides, the first input waveguide of the first optical mixer optically connected to the laser resonator, the second input waveguide of the first optical mixer configured to receive a modulated optical signal;
- a second optical mixer monolithically integrated with the substrate, the second optical mixer having a first and a second input waveguide, a plurality of output waveguides and at least one turning mirror disposed with respect to the input or the output waveguides, the first input waveguide of the second optical mixer optically connected to the laser resonator, the second input waveguide of the second optical mixer configured to receive the modulated optical signal;
- a polarization rotator monolithically integrated with the substrate;
- and
- a plurality of photodetectors monolithically integrated with the substrate, each of the plurality of photodetectors being optically connected to one of the plurality of output waveguides of the first or the second optical mixer.
4 more elements
Dependencies are inferred from the claim text.