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Enhancing the performance of 16384QAM based on delta-sigma modulation using geometric shaping in an IMDD system

Jianye Zhao, Jianxin Ren, Bo Liu, Yaya Mao, Rahat Ullah, Xiangyu Wu, Shuaidong Chen, Yongfeng Wu, Lilong Zhao, and Zhaohui Li

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Abstract

In this Letter, a new, to the best of our knowledge, geometric shaping method for an ultrahigh-order 16384-ary quadrature amplitude modulation (16384QAM) constellation based on the delta-sigma modulation technique is proposed. Based on the characteristics of delta-sigma modulation, the constellation was optimized to obtain greater constellation gain and improve the maximum performance of the system. Finally, the proposed scheme was demonstrated on an intensity-modulated direct detection (IMDD) system through a 25 km single-mode fiber transmission. On performing experiments, it was found that the suggested approach increases the receiver sensitivity of ultrahigh-order QAM communication systems based on delta-sigma modulation by around 0.5 dB and further enhances the error performance limit.

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Data underlying the results presented in this paper are not publicly available at this time but may be obtained from the authors upon reasonable request.

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