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.

Universal photonic processors fabricated by femtosecond laser writing

Pentangelo C.;Ceccarelli F.;Piacentini S.;Albiero R.;Urbinati E.;Di Giano N.;Atzeni S.;Crespi A.;Osellame R.
2022-01-01

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.
2022
Proceedings of SPIE - The International Society for Optical Engineering
9781510648791
9781510648807
Femtosecond Laser Micromachining
Photonic Integrated Circuits
Thermal Crosstalk
Thermo-optic Phase Shifters
Universal Linear Optics
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11311/1227403
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