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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 21, Iss. 3 — Feb. 11, 2013
  • pp: 3885–3890

Polarization demultiplexing in stokes space for coherent optical PDM-OFDM

Zhenming Yu, Xingwen Yi, Qi Yang, Ming Luo, Jing Zhang, Lei Chen, and Kun Qiu  »View Author Affiliations


Optics Express, Vol. 21, Issue 3, pp. 3885-3890 (2013)
http://dx.doi.org/10.1364/OE.21.003885


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Abstract

We propose a polarization demultiplexing method for coherent optical PDM-OFDM based on Stokes space, without inserting training symbols. The proposed approach performs well for different modulation formats of OFDM subcarrier, and shows comparable performances with that of conventional methods, but with a fast convergence speed and reduced overhead. The OFDM signal in the time domain cannot satisfy the conditions of SS-PDM accurately. Therefore, we first digitally convert the received OFDM signals to the frequency domain using fast Fourier transform (FFT). Each subcarrier of the OFDM signal has a much lower speed and narrower bandwidth, the polarization effects that it experiences can be treated as flat. Consequently, we can apply the polarization demultiplexing in Stokes space (SS-PDM) on per subcarrier basis. We verify this method in experiment by transmitting 66.6-Gb/s PDM-OFDM signal with 4QAM subcarrier modulation over 5440km SSMF and 133.3-Gb/s PDM-OFDM signal with 16QAM subcarrier modulation over 960km SSMF respectively. We also compare the results with those of training symbols. Finally, we analyze of the convergence speed of this method.

© 2013 OSA

OCIS Codes
(060.1660) Fiber optics and optical communications : Coherent communications
(060.2330) Fiber optics and optical communications : Fiber optics communications
(060.4080) Fiber optics and optical communications : Modulation
(060.4230) Fiber optics and optical communications : Multiplexing

ToC Category:
Fiber Optics and Optical Communications

History
Original Manuscript: October 24, 2012
Revised Manuscript: December 24, 2012
Manuscript Accepted: January 2, 2013
Published: February 8, 2013

Citation
Zhenming Yu, Xingwen Yi, Qi Yang, Ming Luo, Jing Zhang, Lei Chen, and Kun Qiu, "Polarization demultiplexing in stokes space for coherent optical PDM-OFDM," Opt. Express 21, 3885-3890 (2013)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-21-3-3885


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