Abstract
Topological photonics allow for the significant improvements in the performances and integration degrees of on-chip optical devices, paving the way for the build-up of next-generation photonic integrated circuits. To realize topologically protected flow of light, one of the most promising methods is to create valley edge states within the bandgaps of customized photonic crystals. In this paper, we experimentally demonstrate the transmissions of optical signals in the ultracompact topological waveguiding configurations formed by the Si-based valley photonic crystals owning incomplete bandgaps. Through breaking the spatial inversion symmetry, the linearly dispersive and highly confined topologically nontrivial optical modes can be obtained at telecom wavelengths. Enabled by the band topology, we successfully achieve a high speed of 25 Gbit/s and an ultralow bit error rate of 10−12 on-chip data transfer in such configuration even with highly twisted structures. Besides, we find that the signal degradations in the proposed topological waveguide mainly arise from the optical loss induced by the sharp bends, which is nearly 0.44 dB/bend. Our study introduces the valley photonic crystals with incomplete bandgaps to build topological waveguides operating at telecoms, showing the possibilities of applying the ultracompact valley-dependent circuits for on-chip optical interconnections and communications.
Published Version
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