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17 March 2023 Kilohertz thermo-optic phase shifting in femtosecond laser written photonic integrated circuits
Roberto Memeo, Francesco Ceccarelli, Giacomo Corrielli, Roberto Osellame
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Proceedings Volume PC12411, Frontiers in Ultrafast Optics: Biomedical, Scientific, and Industrial Applications XXIII; PC124110I (2023) https://doi.org/10.1117/12.2649907
Event: SPIE LASE, 2023, San Francisco, California, United States
Abstract
Femtosecond laser written (FLW) reconfigurable photonic integrated circuits are attracting large attention from many applications thanks to their unique features. However, in these devices the frequency response of thermo-optic phase shifters is currently limited to the Hz range, hindering the diffusion of FLW circuits in different fields. Here, we present a thermally-reconfigurable Mach-Zehnder interferometer inscribed just a few micrometers below the surface of a fused silica substrate. The interferometer design, purposely optimized by finite element simulations, allows for switching time lower than 200 μs, phase modulation of the optical signal at kHz frequency and limited impact on the power dissipation.
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Roberto Memeo, Francesco Ceccarelli, Giacomo Corrielli, and Roberto Osellame "Kilohertz thermo-optic phase shifting in femtosecond laser written photonic integrated circuits", Proc. SPIE PC12411, Frontiers in Ultrafast Optics: Biomedical, Scientific, and Industrial Applications XXIII, PC124110I (17 March 2023); https://doi.org/10.1117/12.2649907
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KEYWORDS
Femtosecond phenomena
Thermal optics
Phase shifting
Photonic integrated circuits
Waveguides
Phase modulation
Optical components
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