Application of novel multi-amplitude coding in remodulated passive optical network

doi:10.3785/j.issn.1008-973X.2025.02.021

Journal of ZheJiang University (Engineering Science)

2025, Vol. 59

Issue (2): 433-441 DOI: 10.3785/j.issn.1008-973X.2025.02.021

Application of novel multi-amplitude coding in remodulated passive optical network

Wenhao QIU1(

),Yang LU1,*(

),Liang CHENG2,Chen YAO1,Yanrong ZHAI1,Meihua BI1

1. School of Communication Engineering, Hangzhou Dianzi University, Hangzhou 310016, China
2. Zhongxun Post andTelecommunications Consulting Design Institute, Shanghai 200050, China

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Abstract

Two novel multi-amplitude coding formats (PAM complement coding and amplitude-variable line-coding) were proposed in order to realize colorless ONUs in wavelength division multiplexing passive optical network (WDM PON) which used remodulation technology. The novel coding formats combined the spectrum shaping coding and pulse amplitude modulation (PAM). Spectrum shaping coding suppressed the low frequency component of downstream signal and reduced the crosstalk of downstream signal to the remodulated upstream signal. The high order PAM can improve the coding efficiency of the signal, and the downstream signal which used the high order PAM can be received by the traditional binary receiver. The feasibility of the proposed coding scheme in remodulated WDM PON was verified by simulation. The performance of the 625 Mb/s and 1.25 Gb/s upstream signals remodulated on 10 Gb/s downstream signal was tested. The remodulated WDM PON scheme based on the novel coding formats can reduce the crosstalk of the upstream remodulated signal and improve the coding efficiency of the downstream signal.

Key words： passive optical network colorless optical network unit remodulation multi-amplitude coding code efficiency

Received: 20 December 2023 Published: 11 February 2025

CLC:

TN 915

Fund: 杭州电子科技大学研究生科研创新基金资助项目（CXJJ2023136）.

Corresponding Authors: Yang LU E-mail: 1178927762@qq.com;luyang@hdu.edu.cn

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	Wenhao QIU
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	Meihua BI

Cite this article:

Wenhao QIU,Yang LU,Liang CHENG,Chen YAO,Yanrong ZHAI,Meihua BI. Application of novel multi-amplitude coding in remodulated passive optical network. Journal of ZheJiang University (Engineering Science), 2025, 59(2): 433-441.

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https://www.zjujournals.com/eng/10.3785/j.issn.1008-973X.2025.02.021 OR https://www.zjujournals.com/eng/Y2025/V59/I2/433

新型多幅度编码在再调制无源光网络中的应用

为了在使用再调制技术的波分复用无源光网络（WDM PON）中实现透明光网络单元（colorless ONU），提出2种新型的多幅度编码方式（PAM补码和可变幅线路编码）. 新的编码方式结合了频谱整形编码和脉冲幅度调制（PAM）. 频谱整形编码能够抑制下行信号的低频分量，减少下行信号对上行再调制信号的串扰. 高阶的PAM能够提高信号的编码效率，采用高阶PAM的下行信号可以被传统的二进制接收机接收. 通过仿真验证了所提编码方式在再调制WDM PON中应用的可行性，测试了速率为625 Mb/s和1.25 Gb/s的上行信号再调制在速率为10 Gb/s的下行信号上的性能. 基于新型多幅度编码的再调制WDM PON方案能够减少上行再调制信号遭受的串扰，提高下行信号的编码效率.

关键词： 无源光网络, 透明光网络单元, 再调制, 多幅度编码, 编码效率

Fig.1 System framework of remodulated WDM PON based on new coding mode

Fig.2 Upstream signal receiving process in remodulated PON system　　　　　　　

Fig.3 Coding schematic of PCC based on PAM4

Fig.4 Eye diagram of upstream signal remodulated on PCC signal under same attenuation

Fig.5 Coding schematic of AVLC

Fig.6 Code pattern of sequence “100011000101” in different coding format

Fig.7 Simulation scheme of remodulated WDM PON based on novel multi-amplitude coding

Tab.1 Simulation parameter in remodulated WDM PON simulation system

Fig.8 Spectrum of 10 Gb/s downstream signal after different encoding

Fig.9 Collection of eye image at different code and different rate

Fig.10 Bit error rate curve of different coded signal

Fig.11 Bit error rate curve for 100 Gb/s downstream signal and 12.5 Gb/s upstream signal


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