Open AccessOLT-centralized sampling frequency offset compensation scheme for OFDM-PON
Author(s) -
Ming Chen,
Hui Zhou,
Zheng Zhang,
Rui Deng,
Qinghui Chen,
Miao Peng,
Cuiwei Liu,
Jing He,
Lin Chen,
Xionggui Tang
Publication year - 2017
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.25.019508
Subject(s) - orthogonal frequency division multiplexing , fast fourier transform , carrier frequency offset , optical line termination , computer science , electronic engineering , modulation (music) , optics , passive optical network , frequency offset , telecommunications , physics , algorithm , wavelength division multiplexing , engineering , acoustics , wavelength , channel (broadcasting)
We propose an optical line terminal (OLT)-centralized sampling frequency offset (SFO) compensation scheme for adaptively-modulated OFDM-PON systems. By using the proposed SFO scheme, the phase rotation and inter-symbol interference (ISI) caused by SFOs between OLT and multiple optical network units (ONUs) can be centrally compensated in the OLT, which reduces the complexity of ONUs. Firstly, the optimal fast Fourier transform (FFT) size is identified in the intensity-modulated and direct-detection (IMDD) OFDM system in the presence of SFO. Then, the proposed SFO compensation scheme including phase rotation modulation (PRM) and length-adaptive OFDM frame has been experimentally demonstrated in the downlink transmission of an adaptively modulated optical OFDM with the optimal FFT size. The experimental results show that up to ± 300 ppm SFO can be successfully compensated without introducing any receiver performance penalties.