Compact and Fabrication-Tolerant Waveguide Bends Based on Quadratic Reflectors
Name
Compact and fabrication-tolerant waveguide bends based on quadratic reflectors.pdf
Description
Accepted version
Size
531.11 KB
Format
Adobe PDF
Checksum (MD5)
2010469ad1f494e9fefbdf7835fce463
Author(s)
Yu, Shaoliang
Qiu, Xiaokang
Zuo, Haijie
Turduev, M
Gu, Tian
Hu, Juejun
Date Issued
April 2020
Journal
Journal of Lightwave Technology
Publisher
Institute of Electrical and Electronics Engineers (IEEE)
Citation
Yu, Shaoliang et al. "Compact and Fabrication-Tolerant Waveguide Bends Based on Quadratic Reflectors." Journal of Lightwave Technology 38, 16 (August 2020): 4368 - 4373 © 2020 IEEE
Version
Author's final manuscript
Abstract
We propose and experimentally demonstrate a broadband, polarization-diverse compact bending design for low-index-contrast waveguides, where light is re-directed via total internal reflection (TIR) on an air-trench quadratic (elliptical or parabolic) reflector surface. Compared to prior work based on flat TIR mirrors, the quadratic reflector design contributes to minimized mode leakage and reduced optical losses, enabling high-density, scalable photonic architectures at the chip and board levels. Moreover, we develop a self-aligned fabrication process where the reflector and the waveguide segments are defined in a single lithography step, thereby circumventing the alignment sensitivity issue common to traditional air trench structures. Our simulations predict bending losses down to <0.14 dB per 90° and 180° bend at 850 nm wavelength, and we experimentally measure broadband losses of ∼0.3 dB per 90° and 180° bend for both TE and TM polarizations in structures fabricated using standard UV lithography.
MIT Department
Massachusetts Institute of Technology. Department of Materials Science and Engineering
Massachusetts Institute of Technology. Materials Research Laboratory
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Creative Commons Attribution-Noncommercial-Share Alike
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DOI of Published Version
https://doi.org/10.1109/JLT.2020.2986576
