Open AccessCoherent optical DFT-Spread OFDM transmission using orthogonal band multiplexing
Author(s) -
Qi Yang,
Zhixue He,
Yiming Zhu,
Shaohua Yu,
Xingwen Yi,
William Shieh
Publication year - 2012
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.20.002379
Subject(s) - orthogonal frequency division multiplexing , multiplexing , fast fourier transform , transmission (telecommunications) , electronic engineering , clipping (morphology) , computer science , optics , discrete fourier transform (general) , telecommunications , fourier transform , physics , channel (broadcasting) , algorithm , engineering , fourier analysis , short time fourier transform , linguistics , philosophy , quantum mechanics
Coherent optical OFDM (CO-OFDM) combined with orthogonal band multiplexing provides a scalable and flexible solution for achieving ultra high-speed rate. Among many CO-OFDM implementations, digital Fourier transform spread (DFT-S) CO-OFDM is proposed to mitigate fiber nonlinearity in long-haul transmission. In this paper, we first illustrate the principle of DFT-S OFDM. We then experimentally evaluate the performance of coherent optical DFT-S OFDM in a band-multiplexed transmission system. Compared with conventional clipping methods, DFT-S OFDM can reduce the OFDM peak-to-average power ratio (PAPR) value without suffering from the interference of the neighboring bands. With the benefit of much reduced PAPR, we successfully demonstrate 1.45 Tb/s DFT-S OFDM over 480 km SSMF transmission.