High Spectral Efficiency Coherent Optical OFDM

Abstract

OFDM has quickly gained its attraction in optical communications that are evolving toward software-enhanced optical transmissions. Coherent optical OFDM (CO-OFDM) takes advantage of software capabilities of electronic digital signal processing (DSP) to perform sophisticated operations and has demonstrated its easiness of realizing high spectral efficiency and combating various distortions at the same time. This chapter presents the signal processing of coherent optical MIMO-OFDM and elucidates its capability. In the first part, centered on high spectral efficiency, CO-OFDM is investigated to implement high-order QAM modulation. In the second part, orthogonal-band-multiplexed OFDM (OBM-OFDM) ..