Increased tolerance toward fiber nonlinearity with star L quadrature amplitude modulation modulated coherent optical orthogonal frequency division multiplexing system

Hui Wang; Deming Kong; Yan Li; Jian Wu; Jintong Lin

doi:10.1117/1.OE.51.11.115003

2 November 2012 Increased tolerance toward fiber nonlinearity with star L quadrature amplitude modulation modulated coherent optical orthogonal frequency division multiplexing system

Hui Wang, Deming Kong, Yan Li, Jian Wu, Jintong Lin

Author Affiliations +

Optical Engineering, Vol. 51, Issue 11, 115003 (November 2012). https://doi.org/10.1117/1.OE.51.11.115003

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.

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Hui Wang, Deming Kong, Yan Li, Jian Wu, and Jintong Lin "Increased tolerance toward fiber nonlinearity with star L quadrature amplitude modulation modulated coherent optical orthogonal frequency division multiplexing system," Optical Engineering 51(11), 115003 (2 November 2012). https://doi.org/10.1117/1.OE.51.11.115003

Published: 2 November 2012

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KEYWORDS

Orthogonal frequency division multiplexing

Modulation

Tolerancing

Quadrature amplitude modulation

Stars

Wavelength division multiplexing

Optical amplifiers

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