Compact ultra-broadband light coupling on chip via nonadiabatic pumping
arxiv(2024)
Abstract
Enlarging bandwidth capacity of the integrated photonic systems demands
efficient and broadband light coupling among optical elements, which has been a
vital issue in integrated photonics. Here, we have developed a compact
ultra-broadband light coupling strategy based on nonadiabatic pumping in
coupled optical waveguides, and experimentally demonstrated the designs in
thin-film lithium niobate on insulator (LNOI) platform. We found that
nonadiabatic transition would produce a decreased dispersion of the phases
related to eigenstates in the waveguides. As a consequence, we realized
high-efficiency directional transfer between edgestates for various wavelengths
covering a 1-dB bandwidth of 320 nm in experiment (>400 nm in simulation),
with a coupling length ( 50 μm) approximately 1/10 of that required in the
adiabatic regime. Furthermore, we have constructed complex functional devices
including beamsplitter and multiple-level cascaded networks for broadband light
routing and splitting. Our work preserves significant advantages simultaneously
in extending the operation bandwidth and minimizing the footprint, which
demonstrates great potential for large-scale and compact photonic integration
on chip.
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