Chinese Optics Letters, 2010, 8 (9): 875, Published Online: Oct. 18, 2010  

Phase pre-emphasis for PAPR reduction in optical OFDM systems based on OIDFT or time lens Download: 524次

Author Affiliations
Wuhan National Lab for Optoelectronics, Huazhong University of Science and Technology, Wuhan 430074, China
Abstract
Phase pre-emphasis is theoretically studied and introduced to reduce peak-to-average power ratio (PAPR) in optical orthogonal frequency division multiplexing (OFDM) systems. In intensity modulated (IM) systems, simulations show noticeable PAPR reductions: 4.14 dB (N = 16) and 15.48 dB (N = 512) in time lens-based OFDM, N is the number of subcarriers. An equation is developed to calculate phase values and is proved to be effective. Optical implementing methods are proposed and analyzed. In a time lens-based OFDM system, phase pre-emphasis reduces fiber nonlinearity and results in a 5.2-dB increase of launch power at the bit error rate (BER) of 10?6. Simulations also show similar PAPR reduction and fiber nonlinearity mitigation in optical inverse discrete Fourier transformer (OIDFT) based OFDM systems.

Jing Shao, Wei Li, Xiaojun Liang. Phase pre-emphasis for PAPR reduction in optical OFDM systems based on OIDFT or time lens[J]. Chinese Optics Letters, 2010, 8(9): 875.

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