Andrew M. Weiner, Editor-in-Chief
Gal Shulkind and Moshe Nazarathy
Gal Shulkind and Moshe Nazarathy*
EE Dept., Technion, Israel Institute of Technology, Haifa 32000, Israel
*Corresponding author: firstname.lastname@example.org
DFT-spread (DFT-S) coherent optical OFDM was numerically and experimentally shown to provide improved nonlinear tolerance over an optically amplified dispersion uncompensated fiber link, relative to both conventional coherent OFDM and single-carrier transmission. Here we provide an analytic model rigorously accounting for this numerical result and precisely predicting the optimal bandwidth per DFT-S sub-band (or equivalently the optimal number of sub-bands per optical channel) required in order to maximize the link non-linear tolerance (NLT). The NLT advantage of DFT-S OFDM is traced to the particular statistical dependency introduced among the OFDM sub-carriers by means of the DFT spreading operation. We further extend DFT-S to a unitary-spread generalized modulation format which includes as special cases the DFT-S scheme as well as a new format which we refer to as wavelet-spread (WAV-S) OFDM, replacing the spreading DFTs by Hadamard matrices which have elements +/−1 hence are multiplier-free. The extra complexity incurred in the spreading operation is almost negligible, however the performance improvement with WAV-S relative to plain OFDM is more modest than that achieved by DFT-S, which remains the preferred format for nonlinear tolerance improvement, outperforming both plain OFDM and single-carrier schemes.
©2012 Optical Society of America
Xi Chen, An Li, Guanjun Gao, and William Shieh
Opt. Express 19(27) 26198-26207 (2011)
Minkyu Sung, Hoon Kim, Jaehoon Lee, and Jichai Jeong
Opt. Express 22(19) 23539-23551 (2014)
Qi Yang, Zhixue He, Zhu Yang, Shaohua Yu, Xingwen Yi, and William Shieh
Opt. Express 20(3) 2379-2385 (2012)
Susmita Adhikari, Sander Jansen, Maxim Kuschnerov, Beril Inan, Marc Bohn, and Werner Rosenkranz
Opt. Express 20(26) B608-B614 (2012)
Gal Shulkind and Moshe Nazarathy
Opt. Express 21(11) 13145-13161 (2013)
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