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We experimentally demonstrate simultaneous coherent transmission across 1-$μ$m and C+L bands, carrying 54×125-GBaud PDM-16QAM C+L channels and 2×15-GBaud PDM-QPSK 1-$μ$m channels over 50 km, highlighting 1 $μ$m as a promising additional transmission window while avoiding gas-absorption constraints in C/L-band of HCFs.
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Chen et al. (2026) studied this question.
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