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Optical Engineering

Increased tolerance toward fiber nonlinearity with star L quadrature amplitude modulation modulated coherent optical orthogonal frequency division multiplexing system
Author(s): Hui Wang; Deming Kong; Yan Li; Jian Wu; Jintong Lin
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Paper Abstract

Star L quadrature amplitude modulation (SLQAM, L representing the number of constellation points) modulated orthogonal frequency division multiplexing (OFDM) is applied to the optical domain for the first time. Numerical simulations are conducted between an S16QAM and a square 16QAM modulated optical OFDM system to compare the tolerance toward various transmission penalties in a 30.2-Gbit/s coherent optical OFDM (CO-OFDM) system over 640, 720, and 800 km. After 640-km transmission, the optimal launch power and corresponding Q2 factor of an S16QAM modulated optical OFDM signal are 2 and 0.6 dB higher, respectively, than the square 16QAM modulated OFDM signal in a 30.2-Gbit/s single-channel single-polarization CO-OFDM system, while in a 5×30.2-Gbit/s wavelength-division multiplexing single-polarization CO-OFDM system, the optimal launch power and corresponding Q2 factor of an S16QAM modulated optical OFDM signal are 1 and 0.7 dB higher than with a square 16QAM modulated OFDM signal, showing increased tolerance toward nonlinearity such as SPM and XPM.

Paper Details

Date Published: 2 November 2012
PDF: 5 pages
Opt. Eng. 51(11) 115003 doi: 10.1117/1.OE.51.11.115003
Published in: Optical Engineering Volume 51, Issue 11
Show Author Affiliations
Hui Wang, Beijing Univ. of Posts and Telecommunications (China)
Deming Kong, Beijing Univ. of Posts and Telecommunications (China)
Yan Li, Beijing Univ. of Posts and Telecommunications (China)
Jian Wu, Beijing Univ. of Posts and Telecommunications (China)
Jintong Lin, Beijing Univ. of Posts and Telecommunications (China)


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