Christensen, Jesper Bjerge Koefoed, Jacob Gade Rottwitt, Karsten McKinstrie, C. J.

The future of integrated quantum photonics relies heavily on the ability to engineer refined methods for preparing the quantum states needed to implement various quantum protocols. An important example of such states is quantum-correlated photon pairs, which can be efficiently generated using spontaneous nonlinear processes in integrated microring-...

Pellat-Finet, Pierre Fogret, Eric

An optical ray is defined by its distance to the optical axis of an object, an image, or a refracting surface, and an angle giving its direction of propagation, that is, by a 2-dimensional space vector and a 2-dimensional angular frequency. Since we use spherical segments, the angular frequency is related to the angle between the ray and the normal...

Guan, Xiaowei Hu, Hao Oxenløwe, Leif Katsuo Frandsen, Lars Hagedorn

Dense integration of photonic integrated circuits demands waveguides simultaneously fulfilling requirements on compactness, low loss, high nonlinearity, and capabilities for mass production. In this work, titanium dioxide waveguides with a thick core of 380 nm exhibiting a compact mode size (0.43 mu m(2)) and a low loss (5.4 +/- 1 dB/cm) at telecom...

Faruque, I.I. Llewellyn, D. Ding, Y. Paesani, S. Santagati, R. Bonneau, D. Sinclair, G. F. Bacco, Davide Rottwitt, Karsten Oxenløwe, Leif Katsuo
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We report on-chip interference fringes of very high visibility 89% from heralded single photons from separate ultra-bright silicon micro-ring resonator sources as 4-fold coin-cidences. The reconfigurable chip is also used to measure multipair fringes and conditional gH^{(}^{2)}(0) of single photons.

Pellat-Finet, Pierre Fogret, Eric

An optical ray is defined by its distance to the optical axis of an object, an image, or a refracting surface, and an angle giving its direction of propagation, that is, by a 2-dimensional space vector and a 2-dimensional angular frequency. Since we use spherical segments, the angular frequency is related to the angle between the ray and the normal...

Pellat-Finet, Pierre Fogret, Eric

An optical ray is defined by its distance to the optical axis of an object, an image, or a refracting surface, and an angle giving its direction of propagation, that is, by a 2-dimensional space vector and a 2-dimensional angular frequency. Since we use spherical segments, the angular frequency is related to the angle between the ray and the normal...

Guan, Xiaowei Hu, Hao Oxenløwe, Leif Katsuo Frandsen, Lars Hagedorn

Dense integration of photonic integrated circuits demands waveguides simultaneously fulfilling requirements on compactness, low loss, high nonlinearity, and capabilities for mass production. In this work, titanium dioxide waveguides with a thick core of 380 nm exhibiting a compact mode size (0.43 mu m(2)) and a low loss (5.4 +/- 1 dB/cm) at telecom...

Ozolins, Oskars Da Ros, Francesco Cristofori, Valentina Pang, Xiaodan Udalcovs, A. Schatz, R. Oxenløwe, Leif Katsuo Popov, S. Jacobsen, Gustav Nordahl Peucheret, Christophe
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We investigate microring resonator (MRRs)-based optical spectral reshaping for directly-modulated 4-PAM signals. The phase-filtering of MRR, and consequent dispersion added to the signal, yields 120% reach increase compared to the 95% of amplitude-only filtering.

Ozolins, Oskars Da Ros, Francesco Cristofori, Valentina Pang, Xiaodan Udalcovs, A. Schatz, R. Oxenløwe, Leif Katsuo Popov, S. Jacobsen, Gustav Nordahl Peucheret, Christophe
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We investigate microring resonator (MRRs)-based optical spectral reshaping for directly-modulated 4-PAM signals. The phase-filtering of MRR, and consequent dispersion added to the signal, yields 120% reach increase compared to the 95% of amplitude-only filtering.

Gregersen, Niels de Lasson, Jakob Rosenkrantz Frandsen, Lars Hagedorn Gutsche, Philipp Burger, Sven Kim, Oleksiy S. Breinbjerg, Olav Ivinskaya, Aliaksandra Wang, Fengwen Sigmund, Ole
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In this work, we perform numerical studies of two photonic crystal membrane microcavities, a short line-defect L5 cavity with relatively low quality (Q) factor and a longer L9 cavity with high Q. We compute the cavity Q factor and the resonance wavelength λ of the fundamental M1 mode in the two structures using five state-ofthe-art computational me...