Integrated thermo-optic phase shifters for laser-written photonic circuits operating at cryogenic temperatures

Integrated photonics offers compact and stable manipulation of optical signals in miniaturized chips, with the possibility of changing dynamically their functionality by means of integrated phase shifters. Cryogenic operation of these devices is becoming essential for advancing photonic quantum tech...

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Bibliographic Details
Published in:JPhys photonics 2024-10, Vol.6 (4), p.45023
Main Authors: Ceccarelli, Francesco, Rakonjac, Jelena V, Grandi, Samuele, Riedmatten, Hugues de, Osellame, Roberto, Corrielli, Giacomo
Format: Article
Language:English
Subjects:
cryogenic light modulator
Cryogenic temperature
femtosecond laser waveguide writing
glass photonic chip
Integrated circuits
integrated photonic circuit
Light sources
Liquid helium
Phase shifters
Photonics
reconfigurable photonics
Room temperature
thermo-optic phase shifter
Waveguides
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Summary:Integrated photonics offers compact and stable manipulation of optical signals in miniaturized chips, with the possibility of changing dynamically their functionality by means of integrated phase shifters. Cryogenic operation of these devices is becoming essential for advancing photonic quantum technologies, accommodating components like quantum light sources, single photon detectors and quantum memories operating at liquid helium temperatures. In this work, we report on a programmable glass photonic integrated circuit (PIC) fabricated through femtosecond laser waveguide writing (FLW) and controlled by thermo-optic phase shifters both in a room-temperature and in a cryogenic setting. By taking advantage of a femtosecond laser microstructuring process, we achieved reliable PIC operation with minimal power consumption and confined temperature gradients in both conditions. This advancement marks the first cryogenically-compatible programmable FLW PIC, paving the way for fully integrated quantum architectures realized on a laser-written photonic chip.
ISSN:2515-7647
2515-7647
DOI:10.1088/2515-7647/ad82c2