An improved channel estimation method for a WDM transmission system derived from the CO-OFDM with PDM 64-QAM |
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| Authors: | S Zhang SC Bai CL Bai QL Luo |
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| Institution: | 1. School of Physics Science and Information Technology of Liaocheng University and Shandong Key Laboratory of Optical Communication Science and Technology, Liaocheng 252059, China;2. State Key Laboratory of Information Photonics and Optical Communications, Beijing University of Posts and Telecommunications, Beijing 100876, China;3. School of Advanced Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100191, China |
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| Abstract: | In this study, firstly we presented a wavelength division multiplexed (WDM) transmission system derived from the coherent optical orthogonal frequency division multiplexing (CO-OFDM) with polarization division multiplexing (PDM) and 64 order quadrature amplitude modulation (QAM). We then proposed an improved channel estimation method based on discrete Fourier transform for the system to further improve the performance of the WDM transmission system. Under the experimental conditions employed, the principle and the spectral efficiency of the system, including a proposed algorithm to improve its performance (e.g. the robustness of the transmission impairments of the system) were studied. The simulations results demonstrated that our method improved the system efficient significantly. The system signal at 24 Tb/s can achieve a spectral efficiency of 12.5 bit/s/Hz up to a distance of 2000 km. |
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| Keywords: | CO-OFDM WDM Channel estimation Modulation |
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