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US 10,651,947 B2Granted
Coherent detection with remotely delivered local oscillators
AssigneeFuturewei Technologies, Inc.
InventorsXiao Andy Shen, An Li, Hongzhen Wei, Samina Chowdhury, Feng Zhang, YuSheng Bai
Life of this patent
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Abstract
An integrated coherent receiver that is configured to receive an optical signal and receive a local oscillator (LO) source from a remote location. The integrated coherent receiver is configured to extract phase and frequency information carried by the optical signal using the LO source from the remote location.
Claims21
An integrated coherent receiver (ICR) comprising:
- an optical signal input port configured to receive an optical signal;
- a local oscillator (LO) source input port configured to receive a LO source from a remote laser source;
- a first polarization splitter-rotator (PSR) coupled to the optical signal input port, the first PSR configured to split the optical signal into a first optical signal and a second optical signal according to a polarization of the optical signal;
- a second PSR coupled to the LO source input port, the second PSR configured to split the LO source into a first LO source and a second LO source according to a polarization of the LO source;
- a first set of splitters coupled to the first PSR, the first set of splitters configured to receive the first and the second optical signals, respectively, and to split the first and the second optical signals into a plurality of optical component signals, respectively, the first set of splitters being positioned upstream of a plurality of mixers, each mixer having two differential output ports;
- and
- a second set of splitters coupled to the second PSR, the second set of splitters configured to receive the first and the second LO sources, respectively, and to split the first and the second LO sources into a plurality of LO component sources.
4 more elements
A method for performing coherent detection, the method comprising:
- receiving, at an integrated coherent receiver, an optical signal;
- receiving, at the integrated coherent receiver, a local oscillator (LO) source from a remote location;
- extracting, by the integrated coherent receiver, phase and frequency information carried by the optical signal using the LO source from the remote location;
- splitting the optical signal into a first optical signal and a second optical signal according to a polarization of the optical signal using a first polarization splitter-rotator (PSR);
- splitting the LO source into a first LO source and a second LO source according to a polarization of the LO source using a second PSR;
- splitting the first optical signal and the second optical signal into a plurality of optical component signals using a first set of splitters;
- splitting the first LO source and the second LO source into a plurality of LO component sources using a second set of splitters;
- and
- providing the plurality of optical component signals and the plurality of LO component sources to a plurality of mixers, each mixer having two differential output ports, the first set of splitters and the second set of splitters upstream of the plurality of mixers.
6 more elements
Dependencies are inferred from the claim text.