US Patent Application No: 2012/0076,507

Number of patents in Portfolio can not be more than 2000

SINGLE PIN COHERENT RECEIVER

ALSO PUBLISHED AS: 8805206

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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, MD1487

International Classification(s)

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
OVEIS, GHARAN Shahab Ottawa, CA 12 5
ROBERTS, Kim B Nepean, CA 104 843

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 4 2002
 
TYCO TELECOMMUNICATIONS (US) INC. (1)
* 2004/0264,981 Wavelength monitoring and control system 2 2004
 
LEVEL 3 COMMUNICATIONS, LLC (1)
* 2007/0217,791 Optical communications systems, devices, and methods 2 2006
 
CIENA CORPORATION (1)
* 2005/0196,176 Equalization strategy for dual-polarization optical transport system 17 2004
 
TEXAS INSTRUMENTS INCORPORATED (1)
* 2009/0028,268 Variable power communications including rapid switching between coding constellations of various sizes 2 2007
 
NORTEL NETWORKS LIMITED (1)
* 2004/0208,643 Coherent optical receivers 12 2002
* Cited By Examiner

Patent Citation Ranking

Forward Cite Landscape

Patent Info (Count) # Cites Year
 
CIENA CORPORATION (4)
* 8,958,696 Coherent augmented optical add-drop multiplexer 0 2009
* 2011/0268,442 COHERENT AUGMENTED OPTICAL ADD-DROP MULTIPLEXER 5 2009
* 8,761,614 Parallel conversion between optical and digital 1 2011
* 2012/0321,325 PARALLEL CONVERSION BETWEEN OPTICAL AND DIGITAL 0 2011
 
FUJITSU LIMITED (2)
* 8,768,173 Optical receiver and optical transmission system 0 2011
* 2012/0177,383 OPTICAL RECEIVER AND OPTICAL TRANSMISSION SYSTEM 1 2011
* Cited By Examiner