OLT-centralized sampling frequency offset compensation scheme for OFDM-PON

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...

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Bibliographic Details
Published in:Optics express 2017-08, Vol.25 (16), p.19508-19516
Main Authors: Chen, Ming, Zhou, Hui, Zheng, Zhiwei, Deng, Rui, Chen, Qinghui, Peng, Miao, Liu, Cuiwei, He, Jing, Chen, Lin, Tang, Xionggui
Format: Article
Language:English
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Summary: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.
ISSN:1094-4087
1094-4087
DOI:10.1364/OE.25.019508