Circle-16QAM for a zero-guard-interval CO-OFDM system

Lingyu Kong; Aiying Yang; Peng Guo; Yueming Lu; Yaojun Qiao

doi:10.1117/12.2295467

10 January 2018 Circle-16QAM for a zero-guard-interval CO-OFDM system

Lingyu Kong, Aiying Yang, Peng Guo, Yueming Lu, Yaojun Qiao

Proceedings Volume 10617, 2017 International Conference on Optical Instruments and Technology: Optoelectronic Devices and Optical Signal Processing; 106170C (2018) https://doi.org/10.1117/12.2295467
Event: International Conference on Optical Instruments and Technology 2017, 2017, Beijing, China

Abstract

In this paper, we introduce circle 16 quadrature amplitude modulation (C-16QAM) modulation format in a high spectral efficiency zero-guard-interval (ZGI) coherent optical (CO) orthogonal frequency-division multiplexing (OFDM) system. At transmitter, the C-16QAM has advantages over the conventional square 16QAM in terms of transmission distance and tolerance to laser linewidth and fiber nonlinearities. ZGI CO-OFDM enables to take away the cyclic prefix (CP), so it has the benefit of higher spectral efficiency compared with the conventional CO-OFDM system. At receiver, in order to compensate chromatic dispersion (CD) and phase noise in a single channel ZGI CO-OFDM system, we studied the overlapped frequency domain equalizer (OFDE) and two carrier phase recovery (CPR) algorithms. We simulate the above systems and the results demonstrate that with the C-16QAM, a 28GBaud ZGI CO-OFDM system can have the longer transmission distance, the higher tolerance to laser linewidth and fiber nonlinearities with contrast to the conventional square 16QAM.

Citation Download Citation

Lingyu Kong, Aiying Yang, Peng Guo, Yueming Lu, and Yaojun Qiao "Circle-16QAM for a zero-guard-interval CO-OFDM system", Proc. SPIE 10617, 2017 International Conference on Optical Instruments and Technology: Optoelectronic Devices and Optical Signal Processing, 106170C (10 January 2018); https://doi.org/10.1117/12.2295467

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