Communication Through Phase-Conjugated Optical Variants
First Claim
1. An apparatus comprising an optical receiver, the optical receiver comprising:
- a front-end circuit configured to convert at least two phase-conjugated optical variants carrying a same modulated payload symbol into a corresponding plurality of digital electrical signals; and
a processor configured to;
process the plurality of digital electrical signals to generate a set of complex values representing the same modulated payload symbol;
sum the complex values of the set to generate a summed complex value;
map the summed complex value onto a constellation; and
determine based on the mapped summed complex value a bit-word represented by the same modulated payload symbol.
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Accused Products
Abstract
An optical transport system configured to transmit at least two phase-conjugated optical variants carrying the same modulated symbols, with the phase-conjugated optical variants in being different from one another in one or more of polarization of light, the time of transmission, spatial localization, optical carrier wavelength, and subcarrier frequency during transmission. The two phase-conjugated optical variants can be generated by a single polarization-diversity transmitter to be orthogonally polarized, and propagate through an optical transmission link with the same wavelength and spatial path. The optical variants are detected and processed at the receiver in a manner that enables coherent summation of the corresponding electrical signals prior to constellation de-mapping. The coherent summation tends to cancel out the deleterious effects of nonlinear distortions imparted on the individual phase-conjugated optical variants in an optical fiber transmission link because said nonlinear distortions tend to be opposite to each other.
59 Citations
20 Claims
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1. An apparatus comprising an optical receiver, the optical receiver comprising:
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a front-end circuit configured to convert at least two phase-conjugated optical variants carrying a same modulated payload symbol into a corresponding plurality of digital electrical signals; and a processor configured to; process the plurality of digital electrical signals to generate a set of complex values representing the same modulated payload symbol; sum the complex values of the set to generate a summed complex value; map the summed complex value onto a constellation; and determine based on the mapped summed complex value a bit-word represented by the same modulated payload symbol. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A method of optical communication comprising:
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converting, at an optical receiver, at least two phase-conjugated optical variants carrying a same modulated payload symbol into a corresponding plurality of digital electrical signals; processing the plurality of digital electrical signals to generate a set of complex values representing the same modulated payload symbol; summing the complex values of the set to generate a summed complex value; mapping the summed complex value onto a constellation; and determining based on the mapped summed complex value a bit-word represented by the same modulated payload symbol.
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20. An apparatus comprising an optical transmitter configured to generate at least two phase-conjugated optical variants in response to a symbol of an input payload data stream, the at least two phase-conjugated optical variants differing from one another in one or more of polarization, time of transmission, spatial localization, optical carrier wavelength, and subcarrier frequency.
Specification