Title :
Reduced-Guard-Interval OFDM Using Digital Sub-Band-Demultiplexing
Author :
Shanqin Deng ; Xingwen Yi ; Mingliang Deng ; Zhengyu Luo ; Qi Yang ; Ming Luo ; Kun Qiu
Author_Institution :
Sch. of Commun. & Inf. Eng., Univ. of Electron. Sci. & Technol. of China, Chengdu, China
Abstract :
The overhead of cyclic prefix (CP) in coherent optical OFDM (CO-OFDM) tends to be too large for high-speed and long-haul optical fiber transmissions. We discuss and experimentally demonstrate a transmission of reduced guard interval OFDM (RGI-OFDM) with much reduced CP overhead based on digital sub-band demultiplexing. The proposed techniques are used to process a 66.7-Gb/s RGI-CO-OFDM signal ( ~ 20-GHz bandwidth) after 5440-km fiber transmission. The experiments show that it can reduce the overhead from 36.7% to 12.5%. We also optimize the digital signal processing in the filter bank for a better performance.
Keywords :
OFDM modulation; channel bank filters; demultiplexing; optical fibre networks; signal processing; RGI-CO-OFDM signal; RGI-OFDM; coherent optical OFDM; cyclic prefix; digital signal processing; digital sub-band-demultiplexing; filter bank; optical fiber transmissions; reduced-guard-interval OFDM; OFDM; Optical fibers; Optical filters; Optical receivers; Optical signal processing; Optical transmitters; Coherent optical OFDM (CO-OFDM); reduced guard interval OFDM (RGI-OFDM); sub-band-demultiplexing (SBD);
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2013.2282953
