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Optical Engineering

Enhanced 16 Spiral quadrature amplitude modulation scheme for coherent optical orthogonal frequency division multiplexing systems
Author(s): Jing He; Chong Li; Lin Chen; Ming Chen
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Paper Abstract

We propose an enhanced 16 Spiral quadrature amplitude modulation (QAM) (16 E-Spiral QAM) scheme to overcome the laser phase noise in a coherent optical orthogonal frequency division multiplexing (CO-OFDM) system. Considering both additive white Gaussian noise and large phase noise, 16 E-Spiral QAM schemes have a better transmission performance compared to conventional 16 QAM CO-OFDM systems. The simulated results show that the required optical signal-to-noise ratio (OSNR) of the proposed 16 QAM is, respectively, 0.8 and 2.3 dB less than 16 Spiral and conventional 16 QAM at a bit error rate (BER) of 10−3 in a back-to-back case. After 800-km transmission over a single-mode fiber, the tolerance for the laser linewidth of the 16 E-Spiral QAM can improve about 30 kHz with an OSNR of 18 dB compared to that of a conventional 16 QAM.

Paper Details

Date Published: 9 September 2014
PDF: 5 pages
Opt. Eng. 53(9) 096105 doi: 10.1117/1.OE.53.9.096105
Published in: Optical Engineering Volume 53, Issue 9
Show Author Affiliations
Jing He, Hunan Univ. (China)
Chong Li, Hunan Univ. (China)
Lin Chen, Hunan Univ. (China)
Ming Chen, Hunan Univ. (China)


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