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ROADM System for Space Division Multiplexing With Spatial Superchannels
Mark Feuer, Lynn Nelson, Xiang Zhou, Rejoy Isaac, K. Abedin, B. Zhu, D. Marom, G. Cohen, R. Harel
OFC/NFOEC2013 conterence proceedings,
2013.
[PDF]
[BIB]
Optical Society of America Copyright
The definitive version was published in 2013. , 2013-03-17
{A two-span SDM system includes the first ROADM supporting spatial superchannels and the first cladding-pumped multicore-EDFA directly spliced to multicore transmission fiber. For 6x40x128-Gb/s SDM-WDM-PDM-QPSK transmission, BER penalties are <1.3dB in Add, Drop, and Express paths.}
Joint Digital Signal Processing Receivers for Spatial Superchannels
Mark Feuer, Lynn Nelson, Xiang Zhou, Sheryl Woodward, Rejoy Isaac, Benyuan Zhu, Thierry F. Taunay, Michael Fishteyn, John F. Fini, Man F. Yan
IEEE Photonics Technology Letters,
2012.
[PDF]
[BIB]
IEEE Copyright
This version of the work is reprinted here with permission of IEEE for your personal use. Not for redistribution. The definitive version was published in 2012. , Volume 24, Issue 21, 2012-11-01
{We discuss the advantages of spatial superchannels for future terabit networks based on space division multiplexing (SDM), and demonstrate reception of spatial superchannels by a coherent receiver utilizing joint digital signal processing (DSP). In a spatial superchannel, the SDM modes at a given wavelength are routed together, allowing simplified design of both transponders and optical routing equipment. For example, common-mode impairments can be exploited to streamline the receiver’s DSP. Our lab measurements reveal that the phase fluctuations between the cores of a multicore fiber are strongly correlated, and therefore constitute such a common-mode impairment. We have implemented master-slave phase recovery of two simultaneous 112Gbps subchannels in a 7-core fiber, demonstrating reduced processing complexity with no increase in the bit-error ratio. Furthermore, we have investigated the feasibility of applying this technique to subchannels carried on separate single-mode fibers, a potential transition strategy to evolve today’s fiber networks toward future networks using multicore fibers.}

Demonstration of Joint DSP Receivers for Spatial Superchannels
Mark Feuer, Lynn Nelson, Xiang Zhou, Sheryl Woodward, Rejoy Isaac, B. Zhu, T. F. Taunay, M. Fishteyn, J. F. Fini, M. F. Yan
IEEE Photonics Summer Topicals 2012 conference,
2012.
[PDF]
[BIB]
IEEE Copyright
The definitive version was published in 2012. , 2012-07-09
{We report lab measurements of joint digital signal processing of simultaneous 112Gbps links in a 7-core fiber. Strongly-correlated phase fluctuations between the cores permit reduced processing complexity with no increase in the bit-error ratio.}
400G WDM Transmission on the 50GHz Grid for Future Optical Networks
Xiang Zhou, Lynn Nelson
OSA/IEEE Journal of Lightwave Technology,
2012.
[DOC]
[BIB]
IEEE Copyright
This version of the work is reprinted here with permission of IEEE for your personal use. Not for redistribution. The definitive version was published in 2012. , 2012-10-31
{We review the recent technology advancements related to the transmission of 400Gb/s, wavelength-division-multiplexed channels for optical networks based on the standard 50GHz grid. We discuss the enabling modulation, coding, and line system technologies, as well as the existing challenges. Specifically, these technologies include time-domain hybrid 32-64 quadrature amplitude modulation, nearly ideal digital Nyquist pulse shaping, improved channel bandwidth management methods such as end-to-end carrier frequency control and distributed compensation of filtering effects arising from reconfigurable optical add-drop multiplexers, distributed Raman amplification, and powerful forward-error-correction. We demonstrate 400G transmission on the standard 50GHz grid over meaningful transmission reach for regional and metropolitan applications. However, further studies are needed to fully understand the potential for meeting the requirements of long-haul transmission applications.}

4000km Transmission of 50GHz spaced, 10x494.85-Gb/s Hybrid 32-64QAM using Cascaded Equalization and Training-Assisted Phase Recovery
Xiang Zhou, Lynn Nelson, Peter Magill, Rejoy Isaac, B. Zhu, D. W. Peckham, P. Borel, K. Carlson
OSA (Optical Society of America),
2012.
[DOC]
[BIB]
Optical Society of America Copyright
The definitive version was published in 2012. , 2012-03-07
{Employing time-domain hybrid QAM, training-assisted phase recovery and cascaded equalization, we successfully transmitted ten 494.85Gbit/s PDM-32/64QAM DWDM signals at 8.25b/s/Hz net spectral efficiency (SE) over 40x100km, achieving a record terrestrial SE.distance product of 33000 bit.km/s/Hz}
Research Highlights: Optical Systems Research at AT&T Labs
Martin Birk, Mikhail Brodsky, Mark Feuer, Patrick Iannone, Peter Magill, Jonathan Nagel, Lynn Nelson, Kenneth Reichmann, Sheryl Woodward, Xiang Zhou
IEEE Photonics Newsletter,
2011.
[PDF]
[BIB]
IEEE Copyright
This version of the work is reprinted here with permission of IEEE for your personal use. Not for redistribution. The definitive version was published in IEEE Photonics Newsletter. , 2011-07-01
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Capabilities of Real-Time Digital Coherent Transceivers
Lynn Nelson, Sheryl Woodward
2010 European Conference on Optical Communication,
2010.
[BIB]
{We discuss the capabilities inherent in digital coherent transceivers that make them attractive for core networks. The desirable attributes of these transceivers are presented, from a transmission perspective and from a network perspective, as are future design challenges. }
System And Method For Measuring The Extinction Ratio Of An Optical Transmitter Using An Interferogram Wing-To-Peak Ratio,
Tue Mar 20 16:09:35 EDT 2012
Systems and methods are described that derive a relationship between an optical transmitter's extinction ratio (E.sub.r) and its interferogram wing-to-peak ratio (I.sub.wp). The change in an optical transmitter's I.sub.wp correlates with a change in measured E.sub.r. As the E.sub.r of a telecom signal changes, the power of the modulated signal's interferogram wings change. After a relationship between I.sub.wp and measured E.sub.r has been derived for an optical transmitter, the relationship may be used after deployment to determine an E.sub.r by measuring an I.sub.wp.