霍佳皓, 张晓营, 高凯强, 皇甫伟, 隆克平. 工业无源光网络物理层关键技术及发展趋势[J]. 工程科学学报, 2023, 45(10): 1641-1652. DOI: 10.13374/j.issn2095-9389.2022.12.14.001
引用本文: 霍佳皓, 张晓营, 高凯强, 皇甫伟, 隆克平. 工业无源光网络物理层关键技术及发展趋势[J]. 工程科学学报, 2023, 45(10): 1641-1652. DOI: 10.13374/j.issn2095-9389.2022.12.14.001
HUO Jiahao, ZHANG Xiaoying, GAO Kaiqiang, HUANGFU Wei, LONG Keping. Key technologies and trends in the development of industrial passive optical networks[J]. Chinese Journal of Engineering, 2023, 45(10): 1641-1652. DOI: 10.13374/j.issn2095-9389.2022.12.14.001
Citation: HUO Jiahao, ZHANG Xiaoying, GAO Kaiqiang, HUANGFU Wei, LONG Keping. Key technologies and trends in the development of industrial passive optical networks[J]. Chinese Journal of Engineering, 2023, 45(10): 1641-1652. DOI: 10.13374/j.issn2095-9389.2022.12.14.001

工业无源光网络物理层关键技术及发展趋势

Key technologies and trends in the development of industrial passive optical networks

  • 摘要: 随着工业互联网的不断发展,工业无源光网络(Passive optical network,PON)引起了工业界和学术界的共同关注. 为应对工业互联网多样化场景应用的不同特点,工业PON需满足超高速率、超大连接和低成本的需求,物理层调制格式、复用方式、传输方案、数字信号处理算法等一直是该领域的研究热点. 首先介绍了PON的基本概念,回顾了PON的标准化历程,重点对PON物理层传输方案及关键技术进行梳理,包含强度调制技术、多维复用技术和数字均衡技术的研究进展. 然后,提出了适用于工业PON传输的偏振复用强度调制相干检测系统方案,在仿真平台上分别测试了四电平脉冲幅度调制和开关键控调制两种调制格式在背靠背和20 km传输距离的单模光纤中的传输性能,验证了该方案的优越性. 最后,对工业PON的物理层发展趋势进行展望.

     

    Abstract: With the proliferation of the industrial internet, passive optical networks (PON) have attracted attention from industry and academia. Industrial PONs need to meet the requirements of ultra-high speed, ultra-large connections, and low cost to be able to cope with diverse industrial internet scenarios. Physical layer modulation formats, multiplexing modes, transmission schemes, and digital signal processing algorithms have always been the focus of research in this field. Direct detection and 10 G devices are extensively studied due to their low cost and ease of deployment. However, meeting the power budget targets of a high-speed PON can be challenging. Transmission of a high-order modulation signal can improve the system’s capacity; however, it may also decrease the receiver’s sensitivity. Polarization multiplexing technology, coherent detection, and advanced digital signal processing technology can be utilized to meet the demands of industrial PON, such as ultra-high speeds, ultra-large connections, ultra-high capacities, high receiver sensitivity, and high power budgets. The use of intensity modulation schemes at the transmitter would reduce the overall cost of the system. Herein, we propose a digital coherent detection system with polarization multiplexing intensity modulation suitable for industrial PON transmission. The 50 Gbit·s−1 signals modulated with four-level pulse amplitude modulation (PAM 4) and on–off keying (OOK) are transmitted on the simulation platform. Performance assessments of back to back (BTB) transmission and fiber transmission over 20 km are studied to prove the superiority of this proposed scheme. A power budget of more than 32 and 36 dB can be achieved with the polarization multiplexing coherent detection system-based transmission of 50 Gbit·s−1 PAM 4 and NRZ signals, respectively, on a 20 km C-band single-mode fiber at a threshold of 3.8×10−3, which is a considerable improvement over intensity modulation direct detection systems. The superiority of the proposed scheme is further verified by the fact that the 100 Gbit·s−1 PAM 4 signal has better transmission performance in the polarization multiplexing intensity modulation coherent detection system than the NRZ signal. Considering the system performance, the polarization multiplexing intensity modulation coherent detection scheme is expected to be one of the promising solutions for high-speed PON systems. Finally, the development trends of the physical layer of industrial PON are discussed.

     

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