Lucas Deniel

Max Planck Institute of Quantum Optics | MPQ · Division of Laser Spectroscopy

A dispersion-engineered SiC waveguide on a photonic chip simultaneously provides an f-2f interferometer and mid-infrared dispersive-wave frequency-comb generation at 120-pJ pulse energies. Accurate comb-assisted tunable-laser molecular spectroscopy is demonstrated at 3.6 μm.

Silicon-based electro-optic modulators contribute to easing the integration of high-speed and low-power consumption circuits for classical optical communications and data computations. Beyond the plasma dispersion modulation, an alternative solution in silicon is to exploit the DC Kerr effect, which generates an equivalent linear electro-optical ef...

Electro-optic silicon-based modulators contribute to ease the integration of high-speed and low-power consumption circuits for classical optical communications or quantum computers. However, the inversion symmetry in the silicon crystal structure inhibits the use of Pockels effect. An electric field-induced optical modulation equivalent to a Pockel...

Dispersion-engineered silicon-carbide waveguides generate dispersive waves at visible and mid-infrared wavelengths as long as 4 µm. The energy of the seed 70-fs pulses centered at 1.5-µm can be as low as 200 pJ.

The frequency chirping properties of silicon ring resonator modulators (RRMs) are experimentally investigated under sinusoidal modulation. The modulated electric field at the output of an RRM is measured in the time domain thanks to a coherent detection system. The power and phase waveforms are then analyzed in terms of their temporal phase and amp...

Mid-infrared spectroscopy is essential for identifying molecular species, while related electro-optic modulators are crucial for signal-to-noise enhancement via synchronous detection. Therefore, the development of integrated modulators is expected to have a major impact in compact and widespread sensing applications. In this work, we experimentally...

La photonique silicium est une technologie de choix pour l’intégration de circuits photoniques complexes sur des puces de quelques mm² pouvant être fabriquées massivement et à faible coût. L’un des enjeux principaux de cette plateforme est la réalisation d’émetteurs-récepteurs optiques miniatures pour assurer les télécommunications haut-débits entr...

Flat electro-optical frequency combs play an important role in a wide range of applications, such as metrology, spectroscopy, or microwave photonics. As a key technology for the integration of optical circuits, silicon photonics could benefit from on-chip, tunable, flat frequency comb generators. In this article, two different architectures based o...

Silicon photonics on-chip spectrometers are finding important applications in medical diagnostics, pollution monitoring, and astrophysics. Spatial heterodyne Fourier transform spectrometers (SHFTSs) provide a particularly interesting architecture with a powerful passive error correction capability and high spectral resolution. Despite having an int...

Silicon nitride (SiN) has been demonstrated as an exceptional low-loss platform for integrated photonics, however, its relatively small nonlinear refractive index limits its full potential in applications such as all-optical phase modulation, supercontinuum generation, and frequency combs. Here, we demonstrate that through hybrid integration with w...

Gallium sulfide is a van der Waals material with strong optical nonlinearities, while silicon nitride has a small nonlinear index. Here, we demonstrate enhanced all optical Kerr modulation in hybrid silicon nitride/gallium sulfide microring resonators.

Dual-comb spectroscopy using a silicon Mach-Zehnder modulator is reported for the first time. First, the properties of frequency combs generated by silicon modulators are assessed in terms of tunability, coherence, and number of lines. Then, taking advantage of the frequency agility of electro-optical frequency combs, a new technique for fine resol...

Waveguide integrated optical modulators in the mid-infrared wavelength range are of significant interest for molecular spectroscopy. This is because on-chip synchronous detection can improve the performance of detection systems and can also be used for free-space communications where optical modulators working in atmospheric transparency windows ar...

We report on the first demonstration of high-speed optical modulation exploiting Pockels effect in strained silicon waveguides. Bandwidths larger than 20 GHz and low insertion loss have been achieved at a wavelength of 1550 nm.

Ge-rich SiGe photonic circuits have been used to demonstrate a whole set of devices operating in a wide spectral range in the mid-IR. Optical modulation has been demonstrated recently up to 11 micron wavelength.

Waveguide integrated optical modulators in the mid-infrared (mid-IR) wavelength range are of significant interest for molecular spectroscopy in one hand, as on-chip synchronous detection can improve the performance of detection systems, and for free-space communications on the other hand, where optical modulators working in the atmospheric transpar...

We demonstrate 20-Gb/s 4-level pulse amplitude modulation (PAM-4) signal generation using a silicon Mach-Zehnder modulator (MZM) in the O-band. The modulator is driven by two independent binary streams, and the PAM-4 signal is thus generated directly on the chip, avoiding the use of power-hungry digital-to-analog converters (DACs). With optimized a...