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US 9,806,839 B2Granted
Optical compensation using a space division multiplexing electro-optic receiver
AssigneeAcacia Communications, Inc.
InventorsEric Swanson, Christopher Doerr, Graeme Pendock
Life of this patent
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Abstract
Disclosed herein are methods, structures, and devices for optical communications systems operating through turbulent media. More specifically, a spatial division multiplexing photonic integrated circuit is used in conjunction with digital signal processing systems to mitigate the effects of the turbulent media.
Claims17
An optical communication system, comprising:
- a photonic integrated circuit comprising:
- an optical momentum separator comprising a grating coupler having a plurality of rings;
- and
- an array of optical waveguides coupled to an outermost ring of the plurality of rings of the optical momentum separator's grating coupler;
- a digital circuit comprising a plurality of analog-to-digital converters, wherein at least two of the analog-to-digital converters are coupled to respective waveguides of the array of waveguides;
- and
- a compensation circuit comprising a plurality of signal equalizers comprising phase adjusters, wherein at least two of the signal equalizers are coupled to outputs of respective analog-to-digital converters of the plurality of analog-to-digital converters.
4 more elements
A method, comprising:
- receiving an optical signal exhibiting a plurality of angular momenta by imaging the optical signal on an optical momentum separator comprising a grating coupler having a plurality of rings;
- with the optical momentum separator, spatially separating two or more portions of the optical signal based on the two or more portions exhibiting different angular momentum from each other by directing the two or more portions of the optical signal from an outermost ring of the plurality of rings to respective optical waveguides of an array of optical waveguides;
- with a plurality of analog-to-digital converters coupled to the array of optical waveguides, digitizing the two or more spatially separated portions of the optical signal to produce two or more digitized portions;
- with a compensation circuit, receiving from the plurality of analog-to-digital converters the two or more digitized portions and adjusting at least one amplitude associated with at least one of the two or more digitized portions to compensate.
1 more element
Dependencies are inferred from the claim text.