A lithographically programmed meta-coupler in Si3N4 resonators concentrates pump coupling while preserving low loss for other comb lines, yielding nearly 2x wider 3 dB bandwidth and up to 5x more emitted comb power.
H.et al.Octave-spanning dissipative Kerr soliton frequency combs in si 3 n 4 microresonators.Op- tica4, 684–691 (2017)
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Program gain and loss for broadband soliton microcombs
A lithographically programmed meta-coupler in Si3N4 resonators concentrates pump coupling while preserving low loss for other comb lines, yielding nearly 2x wider 3 dB bandwidth and up to 5x more emitted comb power.