Single pin coherent receiver

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United States of America Patent

PATENT NO 8805206
APP PUB NO 20120076507A1
SERIAL NO

12893294

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ATTORNEY / AGENT: (SPONSORED)

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Abstract

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In a coherent optical receiver of an optical communications system, methods and systems for receiving a data signal x(t) modulated on an optical signal. A linearly polarized LO light is generated, which has a frequency of f1=f0±Δf, where f0 is a frequency of a narrowband carrier of the optical signal, and Δf corresponds with a band-width fB of the data signal x(t). The LO light and a received light of the optical signal are heterodyned on a photodetector. An analog signal generated by the photodetector is low-pass filtered to generate a filtered signal, using a filter characteristic having a sharp cut-off at a frequency of Δf+nfB, where n is an integer multiple. An analog-to digital (A/D) converter samples the filtered signal at a sample rate of 2(Δf+nfB) to generate a corresponding multi-bit digital sample stream. The multi-bit digital sample stream is digitally processed to recover respective In-Phase and Quadrature components of the received light of the optical signal.

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Patent Owner(s)

Patent OwnerAddressTotal Patents
CIENA CORPORATIONLINTHICUM, MD1681

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Oveis, Gharan Shahab Ottawa, CA 20 54
Roberts, Kim B Nepean, CA 118 1502

Cited Art Landscape

Patent Info (Count) # Cites Year
 
Other [Check patent profile for assignment information] (1)
* 2003/0123,877 System and method for increasing bandwidth efficiency and throughput of a data transmission network 8 2002
 
TYCO TELECOMMUNICATIONS (US) INC. (1)
* 2004/0264,981 Wavelength monitoring and control system 3 2004
 
LEVEL 3 COMMUNICATIONS, LLC (1)
* 2007/0217,791 Optical communications systems, devices, and methods 3 2006
 
CIENA CORPORATION (4)
* 2005/0196,176 Equalization strategy for dual-polarization optical transport system 28 2004
7555227 Polarization compensation in a coherent optical receiver 22 2005
7606498 Carrier recovery in a coherent optical receiver 47 2006
8005368 Signal equalizer in a coherent optical receiver 17 2007
 
TEXAS INSTRUMENTS INCORPORATED (1)
* 2009/0028,268 Variable power communications including rapid switching between coding constellations of various sizes 3 2007
 
NORTEL NETWORKS LIMITED (1)
* 2004/0208,643 Coherent optical receivers 36 2002
* Cited By Examiner

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