Design and fabrication of reconfigurable laser-written waveguide circuits

Chaboyer, Zachary J.; Stokes, Alex; Downes, James E.; Steel, M. J.; Withford, Michael J.

doi:10.1364/oe.25.033056

Cited by 21 publications

(23 citation statements)

References 31 publications

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“…The result is P 2π = 2π/α = 204 mW, an unprecedented value for a thermally reconfigurable MZI fabricated on a glass substrate. This performance is comparable even to the one obtained from devices having a larger pitch (p = 254 μm) and fabricated with a more complex process based on isolation trenches [18]. Fig.…”

Section: A Transmission Coefficientsupporting

confidence: 66%

“…In this paper, we present a simple and effective strategy for the implementation of efficient thermal phase shifters in FLW-PICs. Thanks to the new technology, we demonstrate the lowest power dissipation reported in the literature for a MZI integrated in a glass substrate, with no need of more complex structuring as isolation trenches [18]. After that, we show that the current control of the thermal shifters has a beneficial effect both in terms of crosstalk and linearity, thus allowing an easier exploitation of FLW-PICs in the applications.…”

Section: Introductionmentioning

confidence: 78%

“…Moreover, silicate glasses, that are often considered the substrate of choice for the FLW-PIC fabrication, are characterized by a thermo-optic coefficient [17] that is more than one order of magnitude lower than other materials, typically employed for the fabrication of PICs, like silicon [13]. In this scenario, the electrical power needed for a complete phase shift of the optical signal can not be lower than many hundreds of milliwatts and, even micromachining the substrate with isolation trenches, this value has never been reduced to less than 200 mW [18]. This is a critical issue that can strongly affect the stability and even the reliability of the device.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Thermal Phase Shifters for Femtosecond Laser Written Photonic Integrated Circuits

Ceccarelli

Atzeni

Prencipe

et al. 2019

J. Lightwave Technol.

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Photonic integrated circuits (PICs) are today acknowledged as an effective solution to fulfill the demanding requirements of many practical applications in both classical and quantum optics. Phase shifters integrated in the photonic circuit offer the possibility to dynamically reconfigure its properties in order to fine tune its operation or to produce adaptive circuits, thus greatly extending the quality and the applicability of these devices. In this paper, we provide a thorough discussion of the main problems that one can encounter when using thermal shifters to reconfigure photonic circuits. We then show how all these issues can be solved by a careful design of the thermal shifters and by choosing the most appropriate way to drive them. Such performance improvement is demonstrated by manufacturing thermal phase shifters in femtosecond laser written PICs (FLW-PICs), and by characterizing their operation in detail. The unprecedented results in terms of power dissipation, miniaturization and stability, enable the scalable implementation of reconfigurable FLW-PICs that can be easily calibrated and exploited in the applications.Index Terms-Femtosecond laser writing, integrated photonics, reconfigurable optical circuits, thermal phase shifters.This work is licensed under a Creative Commons Attribution 4.0 License. For more information, see https://creativecommons.org/licenses/by/4.0/

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Section: A Transmission Coefficientsupporting

confidence: 66%

Section: Introductionmentioning

confidence: 78%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Thermal Phase Shifters for Femtosecond Laser Written Photonic Integrated Circuits

Ceccarelli

Atzeni

Prencipe

et al. 2019

J. Lightwave Technol.

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“…On the one hand, in a previous work [27] we have proved that the power dissipation can be moderately reduced with a compact design of the microheater and, thanks to this approach, we have demonstrated a 2 phase shift for light at 800 nm by dissipating only 200 mW. On the other hand, Chaboyer et al [28] have achieved a similar level of power dissipation, along with some reduction of the thermal crosstalk, by introducing an isolation trench between the two arms of a thermally-reconfigurable Mach-Zehnder interferometer (MZI).…”

Section: Introductionmentioning

confidence: 65%

“…On the other hand, Chaboyer et al. [ 28 ] have achieved a similar level of power dissipation, along with some reduction of the thermal crosstalk, by introducing an isolation trench between the two arms of a thermally‐reconfigurable Mach–Zehnder interferometer (MZI).…”

Section: Introductionmentioning

confidence: 99%

Low Power Reconfigurability and Reduced Crosstalk in Integrated Photonic Circuits Fabricated by Femtosecond Laser Micromachining

Ceccarelli

Atzeni

Pentangelo

et al. 2020

Laser & Photonics Reviews

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Femtosecond laser writing is a powerful technique that allows rapid and cost-effective fabrication of photonic integrated circuits with unique 3D 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 3D microstructures are exploited to decrease the power needed to induce a 2 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 toward 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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QUICK3$^3$ ‐ Design of a Satellite‐Based Quantum Light Source for Quantum Communication and Extended Physical Theory Tests in Space

Ahmadi,

Schwertfeger,

Werner

et al. 2024

Adv Quantum Tech

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Modern quantum technologies have matured such that they can now be used in space applications, e.g., long‐distance quantum communication. Here, the design of a compact true single photon source is presented that can enhance the secure data rates in satellite‐based quantum key distribution scenarios compared to conventional laser‐based light sources. The quantum light source is a fluorescent color center in hexagonal boron nitride. The emitter is off‐resonantly excited by a diode laser and directly coupled to an integrated photonic processor that routes the photons to different experiments performed directly on‐chip: i) the characterization of the single photon source and ii) testing a fundamental postulate of quantum mechanics, namely the relation of the probability density and the wave function (known as Born's rule). The described payload is currently being integrated into a 3U CubeSat and scheduled to launch in 2024 into low Earth orbit. Therefore the feasibility of true single photon sources and reconfigurable photonic circuits in space can be evaluated. This provides a promising route toward a high‐speed quantum network.

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Design and fabrication of reconfigurable laser-written waveguide circuits

Cited by 21 publications

References 31 publications

Thermal Phase Shifters for Femtosecond Laser Written Photonic Integrated Circuits

Thermal Phase Shifters for Femtosecond Laser Written Photonic Integrated Circuits

Low Power Reconfigurability and Reduced Crosstalk in Integrated Photonic Circuits Fabricated by Femtosecond Laser Micromachining

QUICK3$^3$ ‐ Design of a Satellite‐Based Quantum Light Source for Quantum Communication and Extended Physical Theory Tests in Space

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