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The fabrication processes of silicon nitride (Si3N4) photonic devices used in foundries require low temperature deposition, which typically leads to high propagation losses. Here, it is shown that propagation loss as low as 0.42 dB cm−1 can be achieved using foundry compatible processes by solely reducing waveguide surface roughness. By postprocessing the fabricated devices using rapid thermal anneal...
We generate broadband soliton mode-locked dual combs on the same chip and demonstrate high SNR (> 40 dB) near-infrared dual-comb spectroscopy of dichloromethane over a 170 nm optical bandwidth with a short acquisition time of 20 μs.
We investigate competing effects of Raman and Kerr gain in diamond microresonators. Strong, narrowband Raman gain inherent in crystalline materials determines a maximum microresonator size allowable to achieve Kerr combs.
We demonstrate mode-hop-free tuning of a modelocked frequency comb over 60 GHz in a silicon microresonator. A gas-phase spectroscopy of acetylene is performed with a high-spectral-resolution (< 80 MHz) over a bandwidth of 40 THz.
We theoretically show the possibility of generating a coherent, octave-spanning supercontinuum with >1-ps pulses. Our proof-of-principle experiments demonstrate the feasibility of utilizing long waveguides and multiple cross sections for supercontinuum generation at ultralow pulse energies.
We demonstrate frequency comb generation in the visible optical spectrum via excitation of higher-order modes in silicon nitride microresonators. Anomalous group-velocity dispersion from the higher-order mode allows for broadband comb generation spanning 45 THz.
We demonstrate an all-optical quantum random number generator using a degenerate optical parametric oscillator in a silicon-nitride microresonator. We achieve a 2-MHz generation rate and verify the randomness using the NIST Statistical Test Suite.
Using a single pump laser, we demonstrate simultaneous soliton modelocked frequency combs in a silicon-nitride microresonator in the clockwise and counter-clockwise directions with slightly different repetition comb spacings.
We show that soliton-modelocked silicon nitride microresonators are highly stable against external perturbations. Modelocking is maintained even for relatively large RMS pump-power noise and thermal shifts, which represents a key feature for potential applications.
We demonstrate frequency-degenerate optical parametric oscillation via four-wave mixing using dual pumps in a silicon-nitride microresonator. The system offers potential for realization of coherent optical computing and all-optical quantum random number generation.
We stabilize a frequency comb generated by supercontinuum from a Si3N4 microchip and compare it to that generated in silica photonic crystal fibers. For high effective nonlinearities, spontaneous Raman scattering in silica can significantly degrade the supercontinuum coherence.
We demonstrate a microresonator-based dual-comb source. Operation is achieved in the mid-infrared with a single continuous-wave pump source using two silicon microresonators that are each modelocked using thermal control and free-carrier injection.
We demonstrate on-chip dual frequency comb generation from cascaded silicon-nitride microresonators pumped by a single laser. We study the RF beatnotes between these combs as a step towards dual-comb spectroscopy and microwave signal synthesis.
We report the first demonstration of thermally-controlled single-soliton modelocking in silicon-nitride microresonators. With the pump frequency fixed, we use only current control with on-chip integrated heaters to demonstrate a systematic pathway for achieving single-soliton modelocking.
We demonstrate a near-octave spanning and soliton modelocked mid-infrared frequency comb in a silicon microresonator. The soliton state can be accomplished via either pump laser detuning or electrical tuning of the free-carrier lifetime.
We investigate theoretically and experimentally the dynamics of frequency comb formation triggered by mode-crossings in a normal group-velocity dispersion microresonator. We demonstrate that phase-matching conditions can predict the spectral features of the resulting combs.
We present the first observations of breather solitons in microresonators. Our results provide a new perspective on the evolution towards stable soliton formation in microresonator frequency combs.
We show the first demonstration of frequency conversion via four wave mixing in a silicon carbide channel waveguide with a conversion efficiency as high as −19.5 dB over a 180 nm wavelength range.
We demonstrate a spectrally efficient parametric comb source for WDM applications using a Si3N4 dual-coupled microring resonator. This geometry allows for operating wavelength flexibility and avoidance of mode crossings for stable comb generation.
We demonstrate broadband frequency comb generation in the mid-infrared from 2.3 to 3.5 μm in a Si3N4 microresonator with Q=850,000 fabricated using an optimized process for decreasing intrinsic losses and overcoming stress limitations.
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