We discuss the quantum mechanical modelling of spontaneous four wave mixing (SFWM) in dispersion engineered silicon nitride waveguide and ring resonator operating in the 700–800 nm wavelength range in the presence of realistic propagation losses. The photon pair generation rates from dispersion engineered ring-resonators are found to be enhanced by at least two-orders of magnitude when compared to the straight waveguides when excited with pump on-resonance.
We discuss the quantum mechanical modelling of spontaneous four wave mixing (SFWM) in dispersion engineered silicon nitride waveguide and ring resonator operating in the 700–800 nm wavelength range in the presence of realistic propagation losses. The photon pair generation rates from dispersion engineered ring-resonators are found to be enhanced by at least two-orders of magnitude when compared to the straight waveguides when excited with pump on-resonance.
We report the design of an innovative visible-telecom photon pair source based on counter-propagating spontaneous four wave mixing (CP-SFWM) in a silicon nitride microring resonator. Unlike previous designs, the proposed integrated source achieves automatic phase matching, eliminating the need for dispersion engineering. By employing two lasers at wavelengths of 800 nm and 1550 nm as pumps on opposite ends of the bus waveguides, the resonator generates signal and idler photons at the same wavelengths as the pumps, but propagating in opposite directions. The photon pairs are produced in high-quality factor resonant modes, exhibiting a purity of 1, a brightness of 118.70pairs⋅s−1⋅mW−2, and bandwidths of 157.9 MHz and 79.7 MHz for signal and idler photons, respectively. Our proposal outperforms previous CP-SFWM designs in terms of spectral properties of the photon pairs, emission rate, and scalability, making it an interesting alternative for the implementation of integrated photon pair sources for photonic networks.
The work is devoted to the problem of developing integrated single-photon sources based on spontaneous four-wave mixing in ring microresonators. Considering the silicon nitride microresonator as an example, we calculate the group velocity dispersion in a wide wavelength range for the case when the ring resonator is composed of straight and curved sections, and show that for different pump wavelengths it is possible to find an optimal ratio of the height and width of the waveguide, thereby achieving zero group velocity dispersion at a minimum height. Such waveguides, which provide zero dispersion and have a minimum height, are optimal for creating ring microresonators that generate single-photon states via non-degenerate spontaneous four-wave mixing.
We report the design of an integrated visible-telecom photon pair source based on Counter Propagating Spontaneous Four Wave Mixing (CP-SFWM) in a Silicon Nitride (Si3N4) chip with no need of dispersion profile engineering. Two lasers are pumped at 800 nm and 1550 nm at both ends of the optical fiber, generating signal and idler photons at the same wavelengths but with opposite propagation directions, relative to their corresponding pumps. Moreover, these photons exhibit a spectral bandwidth on the order of MHz, achieved by using a high Q factor ring resonator.
The high Kerr coefficient of amorphous silicon makes it a promising material for generating photons on chip via spontaneous four wave mixing (SFWM), for applications in quantum photonics. Previous work shows high photon generation rates in a-Si waveguides, [1], and here we expand this study to investigate micro-ring resonator photon sources, which have a small footprint and can produce photons with high spectral purity, ideal for quantum interference. We compare SFWM generation rates in an a-Si micro-ring resonator to a straight waveguide, in both continuous wave and pulsed pump regimes.
We report the design of an integrated photon pair source based on spontaneous four-wave mixing (SFWM), implemented in an integrated micro-ring resonator in the silicon nitride platform (Si 3 N 4 ). The signal photon is generated with emission at 606 nm and bandwidth of 3.98 MHz, matching the spectral properties of praseodymium ions (Pr), while the idler photon is generated at 1430.5 nm matching the wavelength of a CWDM channel in the E-band. This novel, to the best of our knowledge, device is designed to interact with a quantum memory based on a Y 2 SiO 5 crystal doped with Pr 3+ ions, in which we used cavity-enhanced SFWM along with dispersion engineering to reach the required wavelength and the few megahertz signal photon spectral bandwidth.
Four-wave mixing (FWM) in silicon photonics offers promising applications in optical signal processing, wavelength conversion, and quantum photonics, necessitating a comprehensive understanding of its underlying physics and limitations. Stimulated four-wave mixing in silicon photonic wire waveguides has been investigated theoretically by considering two-photon absorption, free carrier absorption, and free carrier dispersion, etc., operating near λ∼1550 nm. It has been shown that these effects severely degrade the performance when operating at higher pump power levels. We present exact numerical calculations of idler wavelength conversion efficiency and bandwidth taking into account the abovementioned nonlinearities, to show the effects of various parameters within the waveguide structure. We extended to investigate silicon photonic microring resonators in terms of the four-wave mixing performance of high-Q-value microring resonators, which are very promising as photon sources (spontaneous four-wave mixing) for large-scale quantum photonic circuits. Our analysis illustrates the limitations of analytical models in describing FWM in ring resonator behavior at a moderate input power level, necessitating a rigorous numerical approach. Experimentally, we demonstrate stimulated FWM (1525 nm≤λp≤1575 nm) in a silicon photonic wire with a cross-section of 500 nm×220 nm and with a small waveguide length of 2 mm. The idler-to-signal conversion efficiency of about −35 dB has been measured for an approximate launched pump power of 30 mW. The conversion efficiency is improved further in the microring resonator as predicted by the simulation results.