Performance evaluation of (D)APSK modulated coherent optical OFDM system |
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| Affiliation: | 1. ZTE (TX) Inc., Morristown, NJ 07960, USA;2. Key Laboratory for Micro/Nano Optoelectronic Devices of Ministry of Education, School of Information Science and Engineering, Hunan University, Changsha 410082, China;1. Department of Electronics, Informatics and Telecommunications, École Nationale des Sciences Appliquées d’Oujda (ENSAO), University of Mohamed Premier, Oujda, Morocco;2. Dept. Physique, Faculty of Science, Abdelmalek Essaadi University, Tetouan, Morocco;3. FEMTO-ST Institut, Department LOPMD, 16 route de Gray, Franche-Comté University, 25030 Besançon, France;4. Nanomedecine Lab, CHU Jean MINJOZ, University of Franche-Comté, 25030 Besançon, France;1. School of Physics and Technology, Wuhan University, Wuhan, 430072, China;2. College of Communications Engineering, Army Engineering University of PLA, Nanjing, 210001, China;1. Department of Circuit and System, College of Electronic Science and Engineering, National University of Defense Technology, Changsha 410073, China;2. Division of Communication Systems, Department of Electrical Engineering, Linköping University, SE-581 83, Sweden;3. Division of Integrated Circuits and Systems, Department of Electrical Engineering, Linköping University, SE-581 83, Sweden;1. School of Computer Science and Technology, Northwestern Polytechnical University, Xi''an 710072, Shaanxi, China;2. Institut Pluridisciplinaire Hubert CURIEN, Strasbourg, France |
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| Abstract: | Performance of amplitude and phase shift keying (APSK) modulated coherent optical orthogonal frequency division multiplexing (CO-OFDM) with and without differential encoding is investigated. Numerical simulations based on 40 Gbit/s single-channel and 5 * 40 Gbit/s wavelength division multiplexing transmission are performed, and the impacts of amplified spontaneous emission noise, laser linewidth, chromatic dispersion, and fiber nonlinearity on the system performance are analyzed. The results show that compared with conventional 16 quadrature amplitude modulation (QAM) modulated optical OFDM signal, although 16(D)APSK modulated optical OFDM signal has a lower tolerance towards amplified spontaneous emission (ASE) noise, it has a higher tolerance towards fiber nonlinearity such as self-phase modulation (SPM) and cross-phase modulation (XPM): the optimal launch power and the corresponding Q2 factor of 16(D)APSK modulated OFDM signal are respectively 2 dB and 0.5 dB higher than 16QAM modulated optical OFDM signal after 640 km transmission, both in single-channel and WDM CO-OFDM systems. Although the accumulated CD decreases the peak-to-average power ratio (PAPR) during transmission, 16(D)APSK modulated OFDM signal will still remain an advantage compared with 16QAM modulated OFDM signal up to 1000 km single-channel transmission, meanwhile relaxing the needs for training symbols and pilot subcarriers and consequently increase the spectral efficiency. |
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