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14 February 2019 Novel training symbol design for transmitter IQ mismatch compensation in CO-OFDM system
Xiurong Ma, Pengru Li, Haoyuan Zhang, Yunlong Shan, Meng Yang
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Proceedings Volume 11048, 17th International Conference on Optical Communications and Networks (ICOCN2018); 1104826 (2019) https://doi.org/10.1117/12.2522909
Event: 17th International Conference on Optical Communications and Networks (ICOCN2018), 2018, Zhuhai, China
Abstract
Transmitter in-phase/quadrature (IQ) mismatch is difficult to suppress by using traditional methods in coherent optical orthogonal frequency division multiplexing (CO-OFDM) system with higher data rate, as a result an effective compensation method to solve the problem is urgently needed. In this paper, a novel training symbol structure to compensate IQ mismatch is proposed. Based on this structure we deduce the compensation method in frequency domain, and by utilizing the compensation method we can achieve independent compensation of IQ mismatch as well as channel distortion and promote the system performance significantly with the data rate increasing by 30Gb/s compared with the traditional methods. Numerical simulation demonstrates that the proposed method has better BER performance compared with the traditional method at the data rate of 50Gb/s after 640km transmission. When the phase and amplitude mismatch are 15° and 3dB respectively, the OSNR penalty of proposed method can decrease by 6dB while BER reaches to 1×10-3. What’s more, the tolerance of amplitude mismatch and phase mismatch can be improved about 3.5dB and 20° by the proposed method, respectively.
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Xiurong Ma, Pengru Li, Haoyuan Zhang, Yunlong Shan, and Meng Yang "Novel training symbol design for transmitter IQ mismatch compensation in CO-OFDM system", Proc. SPIE 11048, 17th International Conference on Optical Communications and Networks (ICOCN2018), 1104826 (14 February 2019); https://doi.org/10.1117/12.2522909
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KEYWORDS
Distortion
Orthogonal frequency division multiplexing
Transmitters
Tolerancing
Dispersion
Optical communications
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