期刊
OPTICS LETTERS
卷 39, 期 2, 页码 335-338出版社
OPTICAL SOC AMER
DOI: 10.1364/OL.39.000335
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资金
- NSF [ECCS-1128709]
- Directorate For Engineering
- Div Of Electrical, Commun & Cyber Sys [1128709] Funding Source: National Science Foundation
We experimentally demonstrate broadband waveguide crossing arrays showing ultralow loss of 0.0 4dB/crossing (0.9%) on average and converging to 0.033 dB/crossing (0.075%) matching theory and cross-talk suppression over 35 dB in a CMOS-compatible geometry. The principle of operation is the tailored excitation of a low-loss spatial Bloch wave formed by matching the periodicity of the crossing array to the difference in propagation constants of the first-and third-order TE-like modes of a multimode silicon waveguide. Radiative scattering at the crossing points acts like a periodic imaginary-permittivity perturbation that couples two supermodes, which results in imaginary (radiative) propagation-constant splitting and gives rise to a low-loss, unidirectional breathing Bloch wave. This type of crossing array provides a robust implementation of a key component enabling dense photonic integration. (C) 2014 Optical Society of America
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