Reducing the Impact of Nonlinear Distortion in DML-Based OFDM Transmission by Frequency Gap

This paper demonstrates a novel approach to reducing in-band nonlinear distortion in DML-based OFDM transmission by introducing a frequency gap between the optical carrier and signal band. This scheme greatly increases tolerance to nonlinear distortion caused by the interaction between laser chirp a...

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Bibliographic Details
Published in:Journal of Lightwave Technology
Main Authors: Hong-Minh Nguyen, Wei, Chia-Chien, Chuang, Chun-Yen, Chen, Jyehong, Taga, Hidenori, Tsuritani, Takehiro
Other Authors: 光電工程學系, Department of Photonics
Format: Article in Journal/Newspaper
Language:English
Published: 2018
Subjects:
Direct detection
intensity modulation
OFDM
DML
Online Access:http://hdl.handle.net/11536/151928
https://doi.org/10.1109/JLT.2018.2876912
Description
Summary:This paper demonstrates a novel approach to reducing in-band nonlinear distortion in DML-based OFDM transmission by introducing a frequency gap between the optical carrier and signal band. This scheme greatly increases tolerance to nonlinear distortion caused by the interaction between laser chirp and chromatic dispersion. Tuning the frequency gap between 2 to 5 GHz (in accordance with the transmission distance) makes it possible to mitigate a considerable proportion of dispersion-induced nonlinear distortion. Experiment results revealed that the proposed scheme can increase the achievable data rate by up to 136%, compared to conventional OFDM over 300 km of dispersion-uncompensated standard single mode fiber. Following transmission over more than 200 km, the proposed modulation scheme also outperforms conventional OFDM incorporating with a Volterra equalizer by up to 24%. We also conducted optimization of DML bias current and driving voltage. Our results show that operating at high bias and driving voltage can greatly improve data rates following the mitigation of distortion via gapped OFDM.

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