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20 August 2020 Fibonacci-like gratings for fiber-to-waveguide couplers
Odair J. Picin, F. Reyes-Gómez, E. Reyes-Gómez, Osvaldo N. Oliveira Jr., J. R. Mejía-Salazar
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Proceedings Volume 11498, Photonic Fiber and Crystal Devices: Advances in Materials and Innovations in Device Applications XIV; 114980O (2020) https://doi.org/10.1117/12.2568473
Event: SPIE Optical Engineering + Applications, 2020, Online Only
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Abstract
We report on the design of an all-dielectric quasiperiodic grating coupler with rectangular Si ribs on a SiO2 substrate. The structure consists of ten periods built by alternating Si ribs and air according to the S4 step of the Fibonacci series, i.e., the period was made as ABAAB, where A (B) can be used as Si (air) or air (Si). The thicknesses of air and Si ribs were taken as 315 nm, with a total length for the unit cell of 1575 nm. The finite- difference time-domain (FDTD) technique was used to obtain the numerical data within the commercial software Lumerical FDTD. Multiple coupling efficiency peaks were observed owing to self-similarity effects. Furthermore, we show numerically that optimum wavelengths and coupling efficiency amplitudes can be tailored by varying the ribs’ etch-depth and the angle of incidence from the optical fiber, which makes the proposal relevant for efficient, broadband optoelectronic circuits.
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Odair J. Picin, F. Reyes-Gómez, E. Reyes-Gómez, Osvaldo N. Oliveira Jr., and J. R. Mejía-Salazar "Fibonacci-like gratings for fiber-to-waveguide couplers", Proc. SPIE 11498, Photonic Fiber and Crystal Devices: Advances in Materials and Innovations in Device Applications XIV, 114980O (20 August 2020); https://doi.org/10.1117/12.2568473
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KEYWORDS
Fiber couplers
Optical fibers
Waveguides
Photonic integrated circuits
Telecommunications
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