| Joint estimation and compensation of transceiver IQ imbalance for PDM CO-OFDM system |
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| 作者姓名： | 马秀荣 杨梦 单云龙 利晶晶 |
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| 作者单位： | Engineering Research Center of Optoelectronic Devices and Communication Technology |
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| 基金项目： | This work has been supported by the Research Program of Tianjin Education Commission of China(No.2017ZD15)。 |
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| 摘 要： | In this paper, a frequency-domain mathematical model is deduced for polarization-division multiplexing(PDM) coherent optical orthogonal frequency division multiplexing(CO-OFDM) system with transceiver in-phase and quadrature(IQ) imbalances. A novel training symbol structure is designed in which the mirror-subcarriers of pilot subcarriers were modulated with zero signal so that the channel distortion with transceiver IQ imbalances can be estimated. It proves that the channel distortion and transmitter IQ imbalances cannot be separated using the training symbols;therefore, the channel equalization method was used to recover the signals. Simulation results show that at 2 dB transmitter amplitude imbalances, 15° transmitter phase imbalances, 100 Gbit/s transmission rate, 1 040 km standard signal-mode fiber link, and 1×10-3 bit error rate, 23.5 dB optical signal-to-noise ratio(OSNR) is necessary for the proposed method. However, the compared schemes cannot achieve effective transmission.
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| 关 键 词： | TRANSCEIVER POLARIZATION DISTORTION |
| 收稿时间： | 2020/3/16 0:00:00 |
| 修稿时间： | 2020/6/2 0:00:00 |
Joint estimation and compensation of transceiver IQ imbalance for PDM CO-OFDM system |
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| MA Xiu-rong,YANG Meng,SHAN Yun-long and LI Jing-jing.Joint estimation and compensation of transceiver IQ imbalance for PDM CO-OFDM system[J].Opto-electronics Letters,2021,17(3):144-148. |
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| Authors: | MA Xiu-rong YANG Meng SHAN Yun-long and LI Jing-jing |
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| Affiliation: | Engineering Research Center of Optoelectronic Devices and Communication Technology, Ministry of Education, Tianjin University of Technology, Tianjin 300384, China,Engineering Research Center of Optoelectronic Devices and Communication Technology, Ministry of Education, Tianjin University of Technology, Tianjin 300384, China,Engineering Research Center of Optoelectronic Devices and Communication Technology, Ministry of Education, Tianjin University of Technology, Tianjin 300384, China and Engineering Research Center of Optoelectronic Devices and Communication Technology, Ministry of Education, Tianjin University of Technology, Tianjin 300384, China |
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| Abstract: | In this paper, a frequency-domain mathematical model is deduced for polarization-division multiplexing (PDM) coherent optical orthogonal frequency division multiplexing (CO-OFDM) system with transceiver in-phase and quadrature (IQ) imbalances. A novel training symbol structure is designed in which the mirror-subcarriers of pilot subcarriers were modulated with zero signal so that the channel distortion with transceiver IQ imbalances can be estimated. It proves that the channel distortion and transmitter IQ imbalances cannot be separated using the training symbols; therefore, the channel equalization method was used to recover the signals. Simulation results show that at 2 dB transmitter amplitude imbalances, 15°transmitter phase imbalances, 100 Gbit/s transmission rate, 1 040 km standard signal-mode fiber link, and 1×10-3bit error rate, 23.5 dB optical signal-to-noise ratio (OSNR) is necessary for the proposed method. However, the compared schemes cannot achieve effective transmission. |
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