Low power reconfigurability and reduced crosstalk in integrated photonic circuits fabricated by femtosecond laser micromachining

Abstract

Femtosecond laser writing is a powerful technique that allows rapid and cost-effective fabrication of photonic integrated circuits with unique three-dimensional geometries. In particular, the possibility to reconfigure such devices by thermo-optic phase shifters represents a paramount feature, exploited to produce adaptive and programmable circuits. However, the scalability is strongly limited by the flaws of current thermal phase shifters, which require hundreds of milliwatts to operate and exhibit large thermal crosstalk. In this work, thermally-insulating three-dimensional microstructures are exploited to decrease the power needed to induce a 2π phase shift down to 37 mW and to reduce the crosstalk to a few percent. Further improvement is demonstrated when operating in vacuum, with sub-milliwatt power dissipation and negligible crosstalk. These results pave the way towards the demonstration of complex programmable integrated photonic circuits fabricated by femtosecond laser writing, thus opening exciting perspectives in integrated quantum photonics.

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• Variational quantum algorithm for experimental photonic multiparameter estimation
• QUICK${}^3$ -- Design of a satellite-based quantum light source for quantum communication and extended physical theory tests in space
• Experimental multiparameter quantum metrology in adaptive regime
• Two-qubit quantum photonic processor manufactured by femtosecond laser writing
• Toward Higher Integration Density in Femtosecond-Laser-Written Programmable Photonic Circuits
• Waveguide lattice based architecture for multichannel optical transformations
• Programmable quantum circuits in a large-scale photonic waveguide array
• Modular Quantum-to-Quantum Bernoulli Factory in an Integrated Photonic Processor
• Global calibration of large-scale photonic integrated circuits
• Laser-written reconfigurable photonic integrated circuit directly coupled to a single-photon avalanche diode array
• A fixed phase tunable directional coupler based on coupling tuning
• Variational quantum cloning machine on an integrated photonic interferometer
• Experimental verification of Threshold Quantum State Tomography on a fully-reconfigurable photonic integrated circuit