2 November 2012 Increased tolerance toward fiber nonlinearity with star L quadrature amplitude modulation modulated coherent optical orthogonal frequency division multiplexing system
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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.
© 2012 Society of Photo-Optical Instrumentation Engineers (SPIE)
Hui Wang, Hui Wang, Deming Kong, Deming Kong, Yan Li, Yan Li, Jian Wu, Jian Wu, Jintong Lin, 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 . Submission:
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