Weak One-Dimensional Field Confinement Silica Waveguides

Weak One-Dimensional Field Confinement Silica Waveguides

A novel weak one-dimensional field confinement silica waveguide (WCSW) with a large horizontal and vertical aspect ratio and low refractive index difference is proposed and fabricated via sol-gel technique. This new type of waveguide exhibits properties of high lithography tolerance, low polarizatio...

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Bibliographic Details
Main Authors: Chenming Zhao, Lin Chen, Lei Xu, Liying Liu
Format: Article
Language:English
Published: IEEE 2020-01-01
Series:IEEE Photonics Journal
Subjects:
Optical waveguide
evanescent field
optical properties
vertical coupling
Online Access:https://ieeexplore.ieee.org/document/9134915/
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Summary:A novel weak one-dimensional field confinement silica waveguide (WCSW) with a large horizontal and vertical aspect ratio and low refractive index difference is proposed and fabricated via sol-gel technique. This new type of waveguide exhibits properties of high lithography tolerance, low polarization dependence, low propagation loss and low coupling loss with a single-mode fiber. More importantly, WCSW can provide extremely large evanescent field in vertical direction. The measured propagation loss and coupling loss are as low as 0.81 dB&#x002F;cm and 0.71 dB&#x002F;facet, respectively. In addition, high efficiency vertical coupling with a 1.9 <italic>&#x03BC;</italic>m gap between a WCSW bus waveguide and a WCSW based high <italic>Q</italic> (5.4 &#x00D7; 10<sup>4</sup>) ring resonator is achieved, which demonstrates that vertical integration of WCSW is potentially applicable.
ISSN:1943-0655

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