Hadamard precoding for PAPR reduction in optical direct detection OFDM systems

Abstract

The high peak-to-average power ration (PAPR) values of optical orthogond frequency division multiplexing (OFDM) signal limit the system nonlinear tolerance (NLT). In this paper, a novel method based on Hadamard precoding is proposed to reduce the peak-to-average power ratio in optical direct detection OFDM system. The proposed scheme is successfully applied to an experimental system of optical direct-detection OFDM signal transmission through fiber. In this experiment, the 2.5 Gbit/s binary phase shift keying (BPSK) optical OFDM signals with Hadamard precoding are generated and transmitted though a single mode fiber. The experimental results show that the proposed scheme can reduce PAPR by almost 1.5 dB. Meantime the received sensitivity is improved by 2 dB with 100 km fiber transmission compared with that of an ordinary optical direct detection OFDM system.

Keywords

Orthogonal Frequency Division Multiplex / Side Information / Hadamard Matrix / PAPR Reduction / Inverse Fast Fourier Transform

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This work has been supported by the National High-tech Research and Development Program of China (No.2007AA01Z263), the Natural Science Foundation of Hunan Proviuce of China (No.06JJ50108) and the Open Fund of Key Laboratory of Optical Communication and Lightwave Technologies of Education Ministry of China at Beijing University of Posts and Telecommunications.