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Ultra-wideband wavelength division multiplexing (WDM) technologies are essential to dramatically increase the capacity of single mode fiber (SMF) and have recently demonstrated transmission at more than 100 to 400 Tb/s. High-symbol-rate technologies with high-order modulation formats are also effective in accommodating next-generation client signals such as high-speed 800-Gb and 1.6-Tb Ethernet and more. Therefore, the combination of ultra-wideband technologies with high-symbol-rate digital coherent channels must be targeted for research and development. This paper reviews the trends in ultra-wideband WDM transmission beyond a 100-Tb/s capacity. We also introduce our research results on triple-band WDM transmission beyond this capacity using real-time optical transponders and 1-Tb/s-class high-symbol-rate digital coherent channels.
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Hamaoka et al. (2024) studied this question.
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