Receiver with mutually coherent optical frequency combs
First Claim
1. A receiver comprising:
- a mutually-coherent optical comb pair comprising a first comb and a second comb, the second comb having a frequency pitch offset with respect to a frequency pitch of the first comb, each comb generating a plurality of optical tones to produce a plurality of mutually-coherent optical tone pairs, wherein each optical tone generated by the first comb has replicated thereon an input signal having an input bandwidth, and each optical tone generated by the second comb is a reference;
a spectral demultiplexer configured for receiving and separating the plurality of optical tones pairs into spectral channels;
a plurality of coherent detector elements, each detector element corresponding to a spectral channel and configured for unfiltered detection of a corresponding optical tone pair, wherein the plurality of detector elements generates a decomposed spectrum based on the plurality of optical tone pairs; and
a plurality of digitizers configured for measuring a plurality of transform coefficients corresponding to the decomposed spectrum.
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Abstract
A receiver architecture for physically-assisted computing of transforms, such as discrete Fourier transforms (DFT) and discrete Hilbert transforms (DHT), employs mutually-coherent optical frequency combs for detection of the coherent beating between an optical signal and a reference optical tone generated by a local oscillator (LO). A signal replication mixer generates a plurality of signal optical tones having a frequency pitch with an input signal mapped thereon. A reference mixer (local oscillator) generates a plurality of reference optical tones having an offset frequency pitch relative to the signal tones. A receiver backplane detects coherent beating between the signal optical tones and the reference optical tones. The input signal may be in the optical domain or in the radio-frequency domain.
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Citations
25 Claims
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1. A receiver comprising:
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a mutually-coherent optical comb pair comprising a first comb and a second comb, the second comb having a frequency pitch offset with respect to a frequency pitch of the first comb, each comb generating a plurality of optical tones to produce a plurality of mutually-coherent optical tone pairs, wherein each optical tone generated by the first comb has replicated thereon an input signal having an input bandwidth, and each optical tone generated by the second comb is a reference; a spectral demultiplexer configured for receiving and separating the plurality of optical tones pairs into spectral channels; a plurality of coherent detector elements, each detector element corresponding to a spectral channel and configured for unfiltered detection of a corresponding optical tone pair, wherein the plurality of detector elements generates a decomposed spectrum based on the plurality of optical tone pairs; and a plurality of digitizers configured for measuring a plurality of transform coefficients corresponding to the decomposed spectrum. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A receiver comprising:
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a signal replication mixer configured for generating a plurality of signal optical tones across a frequency spectrum and having a frequency pitch, each signal optical tone having an input signal replicated thereon, the input signal having an input bandwidth; a reference mixer configured for generating a plurality of reference optical tones having an offset frequency pitch; and a backplane configured for unfiltered detection of coherent beating between the signal optical tones and the reference optical tones. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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Specification