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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 21, Iss. 7 — Apr. 8, 2013
  • pp: 8808–8814

Heterodyne coherent detection of WDM PDM-QPSK signals with spectral efficiency of 4b/s/Hz

Xinying Li, Ze Dong, Jianjun Yu, Jianguo Yu, and Nan Chi  »View Author Affiliations


Optics Express, Vol. 21, Issue 7, pp. 8808-8814 (2013)
http://dx.doi.org/10.1364/OE.21.008808


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Abstract

We experimentally demonstrate heterodyne coherent detection of 8 × 112-Gb/s ultra-density wavelength-division-multiplexing (WDM) polarization-division-multiplexing quadrature-phase-shift-keying (PDM-QPSK) signal after 1120-km single-mode fiber-28 (SMF-28) transmission. The spectral efficiency (SE) is 4b/s/Hz. It is the first time to realize WDM signal transmission with high SE by adopting heterodyne coherent detection. At the heterodyne coherent receiver, intermediate frequency (IF) down conversion is realized in digital frequency domain after analog-to-digital conversion. A digital post filter and 1-bit maximum likelihood sequence estimation (MLSE) adopted after carrier phase estimation (CPE) in the conventional digital-signal-processing (DSP) process is used to suppress the enhanced noise and crosstalk as well as overcome the filtering effects. The bit-error ratio (BER) for all channels is under the forward-error-correction (FEC) limit of 3.8 × 10−3 after 1120-km SMF-28 transmission.

© 2013 OSA

OCIS Codes
(060.0060) Fiber optics and optical communications : Fiber optics and optical communications
(060.1660) Fiber optics and optical communications : Coherent communications
(060.2840) Fiber optics and optical communications : Heterodyne

ToC Category:
Fiber Optics and Optical Communications

History
Original Manuscript: March 18, 2013
Revised Manuscript: March 22, 2013
Manuscript Accepted: March 23, 2013
Published: April 2, 2013

Citation
Xinying Li, Ze Dong, Jianjun Yu, Jianguo Yu, and Nan Chi, "Heterodyne coherent detection of WDM PDM-QPSK signals with spectral efficiency of 4b/s/Hz," Opt. Express 21, 8808-8814 (2013)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-21-7-8808


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