Optical communication system having enhanced spectral efficiency using electronic signal processing
First Claim
Patent Images
1. An optical communication system comprising:
- a transmitter having a filter that pre-filters each of a plurality of data channels prior to modulation of the data channels and output of an optical transmission; and
a receiver having an equalizer that applies digital equalization to the optical transmission to compensate for the pre-filtering of the data channels at the transmitter.
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Abstract
An optical communication system combines strong electrical pre-filtering of data at the transmitter and digital feedback equalization (DFE) at the receiver to enhance spectral efficiency. The system can be applied to optical networking and digital communication systems, including binary modulated systems optical network systems.
20 Citations
30 Claims
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1. An optical communication system comprising:
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a transmitter having a filter that pre-filters each of a plurality of data channels prior to modulation of the data channels and output of an optical transmission; and a receiver having an equalizer that applies digital equalization to the optical transmission to compensate for the pre-filtering of the data channels at the transmitter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 27)
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19. A method comprising:
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pre-filtering, at an optical transmitter, each of a plurality of data channels to limit a bandwidth for each of the data channels; outputting the pre-filtered data channels from the optical transmitter in the form of an optical transmission; and applying digital equalization to the optical transmission at an optical receiver to compensate for the pre-filtering of the data channels at the transmitter. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 29)
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28. An optical transmitter that pre-filters each of a plurality of data channels prior to modulation of the data channels and output of an optical transmission, wherein application of digital feedback equalization to the optical transmission compensates for the pre-filtering of the data channels and allows bit detection.
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30. An optical receiver comprising:
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a photo detector to receive an optical transmission where each of a plurality of data channels prior of the transmission have been pre-filtered prior to modulation of the data channels; and a digital feedback equalizer (DFE) that applies digital feedback equalization to the optical transmission to compensate for the pre-filtering of the data channels at the transmitter.
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Specification