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US 8,265,483 B2Granted
Parallel optical polarization tracking
AssigneeNEC Laboratories America, Inc.
InventorsRobert Saperstein, Ting Wang, Yue-Kai Huang
Life of this patent
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Abstract
A system to communicate optical data signals in parallel includes an optical splitter to split the data signals into two polarization multiplexed (PM) signals; and two reception channels coupled to the optical splitter, where each reception channel tracks and isolates a PM signal independently.
Claims20
A system to communicate optical data signals in parallel, comprising:
- a. an optical splitter to split the data signals into a plurality of polarization multiplexed (PM) signals, wherein the PM signals are not required to be orthogonal to each other;
- b. a plurality of reception channels coupled to the optical splitter, each reception channel tracking the PM signals independently, and
- c. a controller coupled to each reception channel to rotate incoming signals to align signals with a predetermined polarization state basis, wherein a fraction of output light is captured by an optical tap directing light to the controller to ensure that cross-channel is nullified and wherein the controller rotates signal polarization to avoid crosstalk, wherein the controller rotates a signal polarization relative to its PBS optical state basis when crosstalk is detected.
A method to communicate optical data signals in parallel, comprising:
- a. optically splitting the data signals into a plurality of polarization multiplexed (PM) signals, wherein the PM signals are not required to be orthogonal to each other;
- b. tracking the PM signals independently through a plurality of reception channels, and
- c. controlling each reception channel and rotating incoming signals to align signals with a predetermined polarization state basis, wherein a fraction of output light is captured by an optical tap directing light to the controller to ensure that cross-channel is nullified and wherein the controller rotates signal polarization relative to its PBS optical state basis when crosstalk is detected to avoid crosstalk.
Dependencies are inferred from the claim text.