Integrated sources of entangled photons at the telecom wavelength in femtosecond-laser-written circuits

Atzeni, Simone; Rab, Adil S.; Corrielli, Giacomo; Polino, Emanuele; Valeri, Mauro; Mataloni, Paolo; Spagnolo, Nicolò; Crespi, Andrea; Sciarrino, Fabio; Osellame, Roberto

doi:10.1364/optica.5.000311

Cited by 82 publications

(64 citation statements)

References 39 publications

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“…Recently the femtosecond laser writing technology (FSLW) has established itself as a flexible tool for rapid prototyping of integrated photonic circuits, which is especially valuable for laboratory experiments, where the fabrication time is crucial. FSLW provides low-loss waveguide writing regimes for a wide variety of wavelengths from the visible to the telecom range [20][21][22]. Waveguide fabrication is possible in glasses, crystals, nonlinear materials, etc [23].…”

Section: Introductionmentioning

confidence: 99%

Reconfigurable Photonics on a Glass Chip

et al. 2018

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Reconfigurability of integrated photonic chips plays a key role in current experiments in the area of linear-optical quantum computing. We demonstrate a reconfigurable multiport interferometer implemented as a femtosecond laser-written integrated photonic device. The device includes a femtosecond laser-written 4 × 4 multiport interferometer equipped with 12 thermooptical phase shifters, making it a universal programmable linear-optical circuit. We achieve a record fast switching time for a single nested Mach-Zender interferometer of ∼ 10 ms and quantitatively analyse the reconfigurability of the optical circuit. We believe, that our results will improve the current state of quantum optical experiments utilizing femtosecond laser-written photonic circuits. arXiv:1805.05323v1 [physics.app-ph]

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Section: Introductionmentioning

confidence: 99%

Reconfigurable Photonics on a Glass Chip

et al. 2018

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“…The new thermal shifters were integrated in an existent FLW process for the fabrication of single-mode waveguides [24]. Test chips were specifically designed and fabricated to characterize the optical performance of reconfigurable MZIs having the geometry considered in Section II.…”

Section: Experimental Analysismentioning

confidence: 99%

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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“…Integrated versions of f -2f self-referencing are currently under development and are expected to open new applications for this technology [3][4][5] . Devices that produce efficient SHG are generally also suitable for efficient parametric down-conversion (PDC), an enabling process for integrated quantum photonic systems [6][7][8] .…”

Section: Introductionmentioning

confidence: 99%

On-chip polarization rotator for type I second harmonic generation

et al. 2019

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We demonstrate a polarization rotator integrated at the output of a GaAs waveguide producing type I second harmonic generation (SHG). Form-birefringent phase matching between the pump fundamental transverse electric (TE) mode near 2.0 µm wavelength and the signal fundamental transverse magnetic (TM) mode efficiently generates light at 1.0 µm wavelength. A SiN waveguide layer is integrated with the SHG device to form a multi-functional photonic integrated circuit. The polarization rotator couples light between the two layers and rotates the polarization from TM to TE or from TE to TM. With a TE-polarized 2.0 µm pump, type I SHG is demonstrated with the signal rotated to TE polarization. Passive transmission near 1.0 µm wavelength shows ∼80 % polarization rotation across a broad bandwidth of ∼100 nm. By rotating the signal polarization to match that of the pump, this SHG device demonstrates a critical component of an integrated self-referenced octave-spanning frequency comb. This device is expected to provide crucial functionality as part of a fully integrated optical frequency synthesizer with resolution of less than one part in 10 14 .

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Integrated sources of entangled photons at the telecom wavelength in femtosecond-laser-written circuits

Cited by 82 publications

References 39 publications

Reconfigurable Photonics on a Glass Chip

Reconfigurable Photonics on a Glass Chip

Thermal Phase Shifters for Femtosecond Laser Written Photonic Integrated Circuits

On-chip polarization rotator for type I second harmonic generation

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