@inproceedings{2d9edc5ae8ea4ce6a58b8c0c8c6b5402,
title = "Study of IQ imbalance effect in direct-detection optical OFDM systems",
abstract = "In-phase/quadrature-phase (IQ) imbalance can result in severe performance degradation in optical direct-detection orthogonal-frequency-division- multiplexing (DD-OFDM) systems. We build two optical back-to-back DD-OFDM systems, which implement double-sideband (DSB) and single-sideband (SSB) modulation, respectively. The tolerance to IQ imbalance of these two systems is analyzed and compared using error vector magnitude (EVM) and symbol error rate (SER We find that, in the back-to-back case, the DSB system has stronger robustness to IQ imbalance than the SSB System. We further build two optical DD-OFDM systems each with 40-km transmission, which respectively implement DSB and SSB transmission. Similarly, we analyze and compare the tolerance to IQ imbalance of these two systems in terms of EVM and SER. We find that, however, in the case of 40-km transmission, the SSB system has stronger robustness to IQ imbalance than the DSB system. As a result, we conclude that, in the case of transmission, SSB modulation can enhance the tolerance to IQ imbalance of DD-OFDM systems.",
keywords = "Back to back, DD-OFDM, DSB modulation, EVM, IQ imbalance, SER, SSB modulation, Timing jitter",
author = "Xinying Li and Yufeng Shao and Shumin Zou and Chunning Hou and Xi Zheng and Xiao Liu and Junwen Zhang and Wuliang Fang and Nan Chi",
year = "2009",
doi = "10.1117/12.852039",
language = "English",
isbn = "9780819480347",
series = "Proceedings of SPIE - The International Society for Optical Engineering",
booktitle = "Optical Transmission Systems, Switching, and Subsystems VII",
note = "Optical Transmission Systems, Switching, and Subsystems VII ; Conference date: 02-11-2009 Through 06-11-2009",
}