Daniel B. O. Carvalho

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We investigate experimentally and theoretically the role of group-velocity dispersion and higher-order dispersion on the bandwidth of microresonator-based parametric frequency combs. We show that the comb bandwidth and the power contained in the comb can be tailored for a particular application. Additionally, our results demonstrate that fourth-order(More)
We demonstrate broadband frequency comb generation spanning over 700 nm from 830 to 1540 nm in a dispersion-engineered Si<sub>3</sub>N<sub>4</sub> microresonator. To our knowledge, this is the broadest parametric comb generated near the visible wavelength range.
We demonstrate a degenerate parametric oscillator in a silicon nitride microresonator. We use two frequency-detuned pump waves to perform parametric four-wave mixing and operate in the normal group-velocity dispersion regime to produce signal and idler fields that are frequency degenerate. Our theoretical modeling shows that this regime enables generation(More)
We investigate experimentally and theoretically the role of higher-order-dispersion on the bandwidth of microresonator-based parametric frequency combs. Our results demonstrate that fourth-order dispersion plays a critical role in determining the spectral bandwidth.
We demonstrate an all-optical quantum random number generator using a dual-pumped degenerate optical parametric oscillator in a silicon nitride microresonator. The frequency-degenerate bi-phase state output is realized using parametric four-wave mixing in the normal group-velocity dispersion regime with two nondegenerate pumps. We achieve a random number(More)
In this work we investigate the principles of an alternative method for defining sidewall in optical waveguides fabricated using planar technology. The efficiency of this method is demonstrated through simulations and experimental results regarding propagation losses of a solid core ARROW waveguide fabricated on silicon substrate. It is well known that(More)
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