Very sharp adiabatic bends based on an inverse design

Very sharp 90°micro-bends for adiabatic optical wave propagation in multimode waveguides are demonstrated by an inverse design method, and the devices are fabricated on a silicon-on-insulator platform. The compact bending structures are based on digital waveguide metastructures with footprints as sm...

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Bibliographic Details
Published in:Optics letters 2018-06, Vol.43 (11), p.2482-2485
Main Authors: Liu, Yingjie, Sun, Wenzhao, Xie, Hucheng, Zhang, Nan, Xu, Ke, Yao, Yong, Xiao, Shumin, Song, Qinghai
Format: Article
Language:English
Subjects:
Adiabatic flow
Bend radius
Bending machines
Bends
Computer simulation
Inverse design
Wave propagation
Waveguides
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Summary:Very sharp 90°micro-bends for adiabatic optical wave propagation in multimode waveguides are demonstrated by an inverse design method, and the devices are fabricated on a silicon-on-insulator platform. The compact bending structures are based on digital waveguide metastructures with footprints as small as 2.6  μm×2.6  μm. For waveguides with widths of 2 μm and bending radii of only 1 μm, the TE mode is able to turn around the sharp corner with 1 dB loss and >20  dB suppression ratio to higher-order modes. The transmission spectra of the devices are measured with ∼1  dB loss over a 40 nm bandwidth which are consistent with the numerical simulations.
ISSN:0146-9592
1539-4794
DOI:10.1364/OL.43.002482