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Applying hierarchical modulation and network coding in IM/DD OFDM-PON

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Abstract

In order to efficiently deliver peer-to-peer (P2P) traffic in an orthogonal-frequency division multiplexing based passive optical network (OFDM-PON) system, the NC technology has been proposed to encode P2P traffic, thus reducing the P2P traffic loads. On the other hand, different ONUs may have different signal-to-noise ratios (SNRs) to the OLT in the OFDM-PON system, and so applying NC to encode and delivery the P2P traffic between a high-SNR ONU and a low-SNR ONU may reduce the capacity of the link between the OLT and the high-SNR ONU. That is, the high-SNR ONU, which can apply a higher-order modulation format to receive data from the OLT, has to compromise on the low-SNR ONU to use a lower-order modulation format. In order to improve the network capacity and bandwidth utilization, hierarchical modulation (HM) is proposed to be integrated into the NC based OFDM-PON system, where the high-SNR ONU can apply a higher-order modulation format without degrading the performance of the low-SNR ONU in receiving its P2P traffic from the OLT. The NC and HM based OFDM-PON system structure in both uplink and downlink is illustrated. Extensive simulations are conducted to verify the feasibility of the proposed system. Also, the relation between power ratio of HM and the system performance under different network settings is discussed and analyzed via the simulations.

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Acknowledgements

The authors acknowledge my supervisor Xue Chen and Jijun Zhao for the excellent consultations. I also acknowledge the Shan yong Cai for giving the support.

Funding

This work was supported in part by the National Natural Science Foundation of China under Award No. 61801043, the Natural Science Foundation of Hebei Privince (F2019402240) and the Superior College Science Technology Research Program of Hebei Province (No. QN2020193).

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Authors and Affiliations

  1. State Key Laboratory of Information Photonics and Optical Communications, Beijing University of Posts and Telecommunications, Beijing, 100876, People’s Republic of China

    Nan Feng

  2. 54 institute of China Electronics Technology Group Corporation, Shijiazhuang, 050081, China

    Nan Feng

  3. Hebei Key laboratory of photonic information technology and application (PCTA), Shijiazhuang, 050081, China

    Nan Feng

  4. School of Water Conservancy and Hydroelectric Power, Hebei University of Engineering, Handan, 056038, Hebei, People’s Republic of China

    Bin Lian

  5. Smart Edge Computing and Networking Lab., Department of Electrical and Computer Engineering, University of New Mexico, Albuquerque, NM, 87131, USA

    Xiang Sun

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  1. Nan Feng
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  2. Bin Lian
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  3. Xiang Sun
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Correspondence to Nan Feng.

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Feng, N., Lian, B. & Sun, X. Applying hierarchical modulation and network coding in IM/DD OFDM-PON. Opt Quant Electron 53, 540 (2021). https://doi.org/10.1007/s11082-021-03165-7

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