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【Objective】In recent years, data communication traffic has experienced explosive growth. To meet the demands for high-speed, high-capacity data transmission and the diverse network application scenarios, hybrid network beyond 100 Gbit/s (B100 Gbit/s) using Dense Wavelength Division Multiplexing (DWDM) has increasingly been recognized as an effective solution. This paper analyzes the requirements, key technologies, and practical case studies of such networks, providing technical support and guidance for building high-capacity and efficient communication networks.【Methods】This paper first outlines the requirements for developing B100 Gbit/s DWDM hybrid networks, including network capacity expansion and support for complex network architectures. Next, it details the key technologies for these networks, including constellation shaping, spectrum shaping, and flexible grid technologies. To support bitrate design in hybrid networking, a method for calculating Optical Signal-to-Noise Ratio (OSNR) in cascaded Erbium-Doped Fiber Amplifier (EDFA) communication systems is presented, using parameters such as channel configuration information, transmitted signal optical power, and EDFA gain and noise parameters, to calculate the output OSNR for each wavelength across the link. Finally, by integrating a foreign network case study and based on actual OSNR evaluation, a rational hybrid rate network design is performed, demonstrating the application effectiveness of B100 Gbit/s DWDM hybrid networking in engineering projects.【Results】Implementing B100 Gbit/s DWDM hybrid network, after flexibly configuring transmission rates and bandwidths based on OSNR evaluations, achieves hybrid rate networks deployment at 200, 600 and 800 Gbit/s. This approach fulfills the high-capacity requirements of core sites while accommodating the long-distance, extensive span requirements of edge sites. Furthermore, network upgrades and expansion are smoothly accomplished within a three-year period.【Conclusion】Practice demonstrates that B100 Gbit/s DWDM networking effectively enhances network capacity, flexibility, and spectrum resource utilization. It also provides room for the continuous network evolution, playing a crucial role in advancing the development of high-capacity optical transmission networks. |
