Ultrabroadband High Coupling Efficiency Fiber-to-Waveguide Coupler Using Si<inline-formula> <tex-math notation="LaTeX">$_{3}$</tex-math></inline-formula>N<inline-formula><tex-math notation="LaTeX">$_{4}$ </tex-math></inline-formula>/SiO<inline-formula><tex-math notation="LaTeX">$_{2}$</tex-math></inline-formula> Waveguides on Silicon

Ultrabroadband High Coupling Efficiency Fiber-to-Waveguide Coupler Using Si<inline-formula> <tex-math notation="LaTeX">$_{3}$</tex-math></inline-formula>N<inline-formula><tex-math notation="LaTeX">$_{4}$ </tex-math></inline-formula>/SiO<inline-formula><tex-math notation="LaTeX">$_{2}$</tex-math></inline-formula> Waveguides on Silicon

An easy-to-fabricate but very efficient fiber-to-waveguide coupler is theoretically analyzed and experimentally demonstrated. In this design, light from a single-mode fiber can be butt coupled into a single-mode high-index-contrast Si<inline-formula><tex-math notation="LaTeX">$...

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Bibliographic Details
Main Authors: Tiecheng Zhu, Yiwen Hu, Pradip Gatkine, Sylvain Veilleux, Joss Bland-Hawthorn, Mario Dagenais
Format: Article
Language:English
Published: IEEE 2016-01-01
Series:IEEE Photonics Journal
Subjects:
Integrated optics devices
photonic integrated circuits
waveguides
Online Access:https://ieeexplore.ieee.org/document/7544563/
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Summary:An easy-to-fabricate but very efficient fiber-to-waveguide coupler is theoretically analyzed and experimentally demonstrated. In this design, light from a single-mode fiber can be butt coupled into a single-mode high-index-contrast Si<inline-formula><tex-math notation="LaTeX">$_{3}$</tex-math></inline-formula>N<inline-formula> <tex-math notation="LaTeX">$_{4}$</tex-math></inline-formula>/SiO<inline-formula><tex-math notation="LaTeX">$_{2}$ </tex-math></inline-formula> waveguide with a measured coupling efficiency of 96&#x0025; at the wavelength of 1550&#x00A0;nm and <inline-formula><tex-math notation="LaTeX">$&#x003E;$</tex-math></inline-formula>90&#x0025; in the spectral range from 1450 to 1650&#x00A0;nm. Large horizontal and vertical alignment tolerances of 3.8 <inline-formula> <tex-math notation="LaTeX">$\mu \text{m}$</tex-math></inline-formula> and 3.6 <inline-formula> <tex-math notation="LaTeX">$\mu \text{m}$</tex-math></inline-formula>, respectively, are obtained between the fiber and the waveguide coupler. All these experimental results agree well with simulations. The waveguide coupler also features ease of end-facet cleaving and can be used in ultrabroadband high coupling efficiency applications.
ISSN:1943-0655

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