Comparison and analysis of codes for remodulation WDM-PON with adaptive code selection |
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| Authors: | Yang Lu Shenglei Wang Duoduo Zeng Lei Xu Changjian Guo Sailing He |
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| Institution: | 1. Centre for Optical and Electromagnetic Research (COER), State Key Laboratory of Modern Optical Instrumentation, Zhejiang University, Hangzhou 310058, China;2. ZJU-SCNU Joint Research Center of Photonics, South China Normal University, Guangzhou 510006, China;3. NEC Labs America, Princeton, NJ 08540, USA;1. School of Biotechnology, Key Laboratory of Industrial Biotechnology (Ministry of Education), Jiangnan University, Wuxi, Jiangsu 214122, China;2. School of Life Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai 200030, China;1. The Key Laboratory of Industrial Biotechnology, Ministry of Education, Jiangnan University, Wuxi 214122, China;2. School of Biotechnology, Jiangnan University, Wuxi 214122, China;3. National Engineering Laboratory for Cereal Fermentation Technology, Jiangnan University, Wuxi 214122, China;4. The Key Laboratory of Carbohydrate Chemistry and Biotechnology, Ministry of Education, Jiangnan University, Wuxi 214122, China;5. School of Food Science and Technology, Jiangnan University, Wuxi 214122, China;1. Department of Electronics, Telecommunications and Informatics, University of Aveiro and Instituto de Telecomunicações, 3810-193 Aveiro, Portugal;2. CPqD, Division of Optical Technologies, 13086-902 Campinas, SP, Brazil;1. Department of Chemistry, Inha University, 100 Inha-ro, Nam-gu, Incheon 402-751, Republic of Korea;2. Department of Applied Chemistry, Kyung Hee University, Gyeonggi 446-701, Republic of Korea;3. Department of Chemistry, Sogang University, 1 Shinsudong Mapogu, Seoul 121-742, Republic of Korea;1. Department of Pharmaceutics, School of Pharmacy, Shahid Beheshti University of Medical Sciences, Tehran, Iran;2. Students Research Committee, School of Pharmacy, Shahid Beheshti University of Medical Sciences, Tehran, Iran;3. Chemistry Department, College of Science, Shiraz University, Shiraz, Iran |
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| Abstract: | In a remodulation PON, the upstream signal quality can be improved when the downstream signal is coded. But low code efficiency may result in network congestion in downlink. Based on the downlink traffic, a self-adapting PON can select the proper downstream modulation codes to achieve the optimal network performance. With adaptive code selection, network congestion can be avoided and the remodulated upstream signal suffers minimal performance degradation. Some codes of various coding efficiency are required to be selected in this self-adapting PON. These codes should induce as little crosstalk to the upstream signal as possible. Several candidate codes with coding efficiencies from 50% to 80%, such as Manchester code, 3b5b code, 4b5b code, 4b6b code and 6b8b code are tested through simulation and experiment in this paper, and their performances are compared. The results show that the optimum code for downstream modulation depends on the downlink traffic and the upstream bit rate. The results will help the self-adapting remodulation WDM-PON to select the proper downstream modulation codes in different traffic situations. |
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