DSP-based CSO cancellation technique for RoF transmission system implemented by using directly modulated laser

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We propose and demonstrate a simple composite second-order (CSO) cancellation technique based on the digital signal processing (DSP) for the radio-over-fiber (RoF) transmission system implemented by using directly modulated lasers (DMLs). When the RoF transmission system is implemented by using DMLs, its performance could be limited by the CSO distortions caused by the interplay between the DML's chirp and fiber's chromatic dispersion. We present the theoretical analysis of these nonlinear distortions and show that they can be suppressed at the receiver by using a simple DSP. To verify the effectiveness of the proposed technique, we demonstrate the transmission of twenty-four 100-MHz filtered orthogonal frequency-division multiplexing (f-OFDM) signals in 64 quadrature amplitude modulation (QAM) format over 20 km of the standard single-mode fiber (SSMF). The results show that, by using the proposed technique, we can suppress the CSO distortion components by > 10 dB and achieve the error-vector magnitude performance better than 6% even after the 20-km long SSMF transmission. (C) 2017 Optical Society of America
Publisher
OPTICAL SOC AMER
Issue Date
2017-05
Language
English
Article Type
Article
Keywords

2ND-ORDER DISTORTION

Citation

OPTICS EXPRESS, v.25, no.11, pp.12152 - 12160

ISSN
1094-4087
DOI
10.1364/OE.25.012152
URI
http://hdl.handle.net/10203/225111
Appears in Collection
EE-Journal Papers(저널논문)
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