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A wavelength demultiplexer for CWDM system is designed, fabricated and characterized based on metamaterial structure. The device experimentally displays low loss (−2.3dB), low crosstalk (−16.4dB) and broad 1-dB bandwidth (>18nm) with compact size of 2.6μm×5μm.
Inverse-designed star-crossings with 8 and 10 ports are proposed, with ultra-short coupling lengths of 5.28μm and 5.4μm respectively. Their measured ILs are less than 1.6dB and 2.4dB respectively over 60nm bandwidth centered 1550nm wavelength.
We propose a novel method to flexibly tune the optical frequency combs generated in normal-dispersion microresonators based on parametric seeding. The pulse duration could be adjusted in the range of 0.7–3.076 ps by changing the seeding power from 1 to 5 mW, and the repetition rate could increase $N$ times by setting the seeding frequency at $N$ times free spectral range away from the pump.
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