Coherent Optical DFT-Spread OFDM

Details Coherent Optical DFT-Spread OFDM Coherent Optical DFT-Spread OFDM

2011-02-28

arxiv.org/abs/1102.5641v1

Computer Science

Information Theory

This idea was originally submitted at Nov. 28th, 2009. After many times of rejection and resubmission, it was finally accepted

Scientific paper

We consider application of the discrete Fourier transform-spread orthogonal frequency-division multiplexing (DFT-spread OFDM) technique to high-speed fiber optic communications. The DFT-spread OFDM is a form of single-carrier technique that possesses almost all advantages of the multicarrier OFDM technique (such as high spectral efficiency, flexible bandwidth allocation, low sampling rate and low-complexity equalization). In particular, we consider the optical DFT-spread OFDM system with polarization division multiplexing (PDM) that employs a tone-by-tone linear minimum mean square error (MMSE) equalizer. We show that such a system offers a much lower peak-to-average power ratio (PAPR) performance as well as better bit error rate (BER) performance compared with the optical OFDM system that employs amplitude clipping.

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