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5 March 2022 Universal photonic processors fabricated by femtosecond laser writing
C. Pentangelo, F. Ceccarelli, S. Piacentini, R. Albiero, E. Urbinati, N. Di Giano, S. Atzeni, A. Crespi, R. Osellame
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Proceedings Volume 12004, Integrated Optics: Devices, Materials, and Technologies XXVI; 120040B (2022) https://doi.org/10.1117/12.2608132
Event: SPIE OPTO, 2022, San Francisco, California, United States
Abstract
Universal photonic processors (UPPs) are reconfigurable photonic integrated circuits able to implement arbitrary unitary transformations on an input photonic state. Femtosecond laser writing (FLW) allows for rapid and cost-effective fabrication of circuits with low propagation losses. A FLW process featuring thermal isolation allows for a dramatic reduction in dissipated power and crosstalk in integrated thermally-reconfigurable Mach-Zehnder interferometers (MZIs), especially when operated in vacuum, with 0.9 mW dissipation for full reconfiguration and 0.5% crosstalk at 785 nm wavelength. To demonstrate the potential of this technology we fabricated and characterized a 6-mode FLW-UPP in a rectangular MZI mesh with 30 thermal shifters.
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C. Pentangelo, F. Ceccarelli, S. Piacentini, R. Albiero, E. Urbinati, N. Di Giano, S. Atzeni, A. Crespi, and R. Osellame "Universal photonic processors fabricated by femtosecond laser writing", Proc. SPIE 12004, Integrated Optics: Devices, Materials, and Technologies XXVI, 120040B (5 March 2022); https://doi.org/10.1117/12.2608132
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KEYWORDS
Phase shifts
Femtosecond phenomena
Photonic integrated circuits
Waveguides
Interferometers
Resistors
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