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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 26 — Dec. 10, 2012
  • pp: B595–B600

Digital coherent superposition for performance improvement of spatially multiplexed coherent optical OFDM superchannels

Xiang Liu, S. Chandrasekhar, A. H. Gnauck, P. J. Winzer, S. Randel, S. Corteselli, A. R. Chraplyvy, R. W. Tkach, B. Zhu, T. F. Taunay, and M. Fishteyn  »View Author Affiliations


Optics Express, Vol. 20, Issue 26, pp. B595-B600 (2012)
http://dx.doi.org/10.1364/OE.20.00B595


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Abstract

We demonstrate the use of digital coherent superposition to improve the performance of space-division-multiplexed (SDM) 676-Gb/s OFDM-16QAM superchannels, achieving ~4 dB improvement in OSNR by using two SDM copies and 1075-km (14x76.8km) transmission over a seven-core-fiber with an effective aggregate spectral efficiency of 23.7 b/s/Hz. We further show that the performance improvement from the coherent superposition is retained in the nonlinear transmission regime through coordinated scrambling of signal constellations at the transmitter and appropriate unscrambling at the receiver, by using a series of simple scrambling functions.

© 2012 OSA

OCIS Codes
(060.1660) Fiber optics and optical communications : Coherent communications
(060.2330) Fiber optics and optical communications : Fiber optics communications
(060.4230) Fiber optics and optical communications : Multiplexing

ToC Category:
Transmission Systems and Network Elements

History
Original Manuscript: October 3, 2012
Revised Manuscript: November 28, 2012
Manuscript Accepted: November 28, 2012
Published: December 6, 2012

Virtual Issues
European Conference on Optical Communication 2012 (2012) Optics Express

Citation
Xiang Liu, S. Chandrasekhar, A. H. Gnauck, P. J. Winzer, S. Randel, S. Corteselli, A. R. Chraplyvy, R. W. Tkach, B. Zhu, T. F. Taunay, and M. Fishteyn, "Digital coherent superposition for performance improvement of spatially multiplexed coherent optical OFDM superchannels," Opt. Express 20, B595-B600 (2012)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-20-26-B595


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References

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