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26 February 2019 Exploring the impacts of long-period corrugation and phase gratings on a cascade of phase-shifted lithium niobate waveguides with the combined theoretical and experimental approaches
Ricky W. Chuang, Yu-Chun Huang, Yao-Jen Lee
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Proceedings Volume 10912, Physics and Simulation of Optoelectronic Devices XXVII; 1091216 (2019) https://doi.org/10.1117/12.2507560
Event: SPIE OPTO, 2019, San Francisco, California, United States
Abstract
Highly reliable and low-cost long-period corrugation and phase gratings based on a cascade of phase-shifted lithium niobate waveguides are theoretically analyzed, experimentally realized and characterized in a logical sequence. The realization of these phase-shifted waveguide gratings (LPWG) is subsequently achieved via a two-step proton exchange method. The measurement results have demonstrated that the maximum dip contrast is up to 19.73 dB and the narrowest full-width-at-half-maximum (FWHM) is close to 2.34 nm. Furthermore, for the cascaded pi-phase-shifted long-period waveguide gratings (LPWG), the two resonance wavelengths are symmetrically shifted away from the center wavelength in response to an increase in the number of LPWG sections incorporated.
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Ricky W. Chuang, Yu-Chun Huang, and Yao-Jen Lee "Exploring the impacts of long-period corrugation and phase gratings on a cascade of phase-shifted lithium niobate waveguides with the combined theoretical and experimental approaches", Proc. SPIE 10912, Physics and Simulation of Optoelectronic Devices XXVII, 1091216 (26 February 2019); https://doi.org/10.1117/12.2507560
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KEYWORDS
Cladding
Waveguides
Photoresist materials
Lithium niobate
Phase shifts
Refractive index
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