Low power four wave mixing in an integrated, micro-ring resonator with Q = 12 million

Abstract

Abstract:We demonstrate efficient, low power, continuous-wave fourwave mixing in the C-band, using a high index doped silica glass micro ring resonator having a Q-factor of 1.2 million. A record high conversion efficiency for this kind of device is achieved over a bandwidth of 20nm. We show theoretically that the characteristic low dispersion enables phasematching over a bandwidth > 160nm.

New CMOS-compatible platforms based on silicon nitride and Hydex for nonlinear optics

“…Hydex waveguides have been engineered to yield anomalous dispersion over most of the C-band with the zero-GVD points being 1600 nm for a TE polarization and 1560 nm for TM [76]. This resulted in a large FWM wavelength tuning range with an efficient parametric gain of +15dB and a signal to idler conversion efficiency of +16.5dB [74].…”

“…Nonlinear parameters for CMOS compatible optical platforms a-Si [127] c-Si [2,47] SiN [55][56][57] Hydex [63,76] [55,56]. The nanowire dimensions are 500nm thick by 1 µm wide.…”

Integrated frequency comb source of heralded single photons

“…The dispersion is small and anomalous, guaranteeing a large four-wave mixing (FWM) gain bandwidth at telecom wavelengths. The input and output bus waveguides are pigtailed to standard single mode fibers, resulting in coupling losses of <1.5 dB per facet (more details can be found in [28,29]). The ring resonator has resonances that are aligned to the ITU grid on a 200 GHz spacing.…”

Sub-picosecond phase-sensitive optical pulse characterization on a chip

“…Device patterning and fabrication were performed using photolithography and reactive ion etching to produce low sidewall roughness on the core layer, before over-coating with a silica glass upper cladding layer. The resulting waveguide possesses a high effective nonlinearity (220W -1 km -1 ) due to a combination of tight mode confinement and high intrinsic n 2 , as well as a small and anomalous dispersion [26], and has very low linear (<6dB/m) and negligible nonlinear optical losses (up to 25GW/cm 2 ) [25,26]. This platform has shown excellent FWM performance -both in terms of conversion efficiency and bandwidth -with no appreciable gain saturation [28].…”

“…Our approach maintains the relative roles of the signal, the (external) pump and the idler that exist in the classical TWM implementation. The nonlinear optical component in our work is a 45-cm long spiral waveguide implemented in a high index, CMOS compatible, doped silica glass platform [25][26][27][28] (see Methods for details). The high nonlinear response exhibited by these waveguides [27,28] allows efficient wavelength conversion [25,26,28] throughout its anomalous dispersion regime, spanning from 1300nm to 1600nm [26].…”