Compact on-chip power splitter based on topological photonic crystal
Optical Materials Express(2024)
摘要
We propose and demonstrate an on-chip 1*N power splitter based on topological
photonic crystal (TPC) on a monolithic silicon photonic platform. Benefiting
from the valley-locked propagation mode at the interface of TPCs with different
topological phases, the proposed power splitter has negligible backscattering
around the sharp bendings and good robustness to fabrication defects, which
therefore enable lower insertion loss, better uniformity, and more compact
footprint than the conventional designs. For the fabricated 1*2 (8) power
splitter, the uniformity among the output ports is below 0.35 (0.65) dB and the
maximum insertion loss is 0.38 (0.58) dB with compact footprint of 5*5 um2
(10*12 um2) within a bandwidth of 70 nm. In addition, the topological power
splitter only requires simple configurations of TPCs with different topological
phases, which is more reliable in design and fabrication compared with the
conventional designs.
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