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In this paper, we investigate semiconductor nanowaveguides (i.e. ridge waveguides with core-widths narrower than 1 μm) intended to act as novel optical light sources through nonlinear wavelength/frequency conversion. In particular, numerical calculations have been performed in order to design suitable photonic devices (fabricated in the AlGaAs/GaAs platform) capable of high efficiency second harmonic...
The promise of higher data-rate telecommunications links has focussed research efforts into all-optical signal processing schemes. Many of these have targeted digital operations using devices such as Semiconductor Optical Amplifiers (SOAs)[1] and micro-ring lasers[2]. Although all-optical digital processing will allow 3R (reamplification, reshaping and retiming) and logic operations, ultra-high-bit-rate...
All-optical signal processing has been demonstrated extensively in Si including demultiplexing at 160Gb/s via four-wave mixing (FWM) [1] and optical regeneration [2], as well as in chalcogenide glass (ChG) waveguides[3]. The efficiency of all-optical devices can be improved by increasing the nonlinear parameter, γ = ω n2 / c Aeff (Aeff is the waveguide effective area, n2 is the Kerr nonlinearity)...
Modal phase-matched second harmonic generation is obtained in sub-micron AlGaAs waveguides using a continuous-wave laser at telecommunication wavelengths. The tunability and robust fabrication process make this device ideal for integrated wavelength conversion.
In this work we present the design and first experimental demonstration of integrated-waveguide, ultra-fast all-optical differentiator based on π-phase-shifted Bragg gratings. Such a photonic device was achieved in deeply-side-etched Silicon-on-Insulator (SOI) ridged waveguides. High coupling coefficient, up to 1.15 *105 m-1, achieved in fabricated set of devices, allows for the wide operational bandwidth,...
We demonstrate a wide range of novel functions in integrated, CMOS compatible, devices. This platform has promise for telecommunications and on-chip WDM optical interconnects for computing.
Efficient modal phase-matched second harmonic generation is obtained in sub-wavelength AlGaAs waveguides using a continuous-wave laser at telecommunication wavelengths. The tunability and robust fabrication process make this device ideal for integrated wavelength conversion.
We demonstrate a CMOS-compatible, integrated optical parametric oscillator in a high-index doped silica glass ring resonator. We obtain lasing with wavelength spacings from 200 GHz to > 6THz, with a threshold as low as 54mW.
We report the theoretical and experimental demonstration of an all-optical temporal differentiator based on π-phase-shifted Bragg gratings fabricated in Silicon-on-Insulator waveguides. All-optical processing of sub-picosecond pulses was performed.
A supercontinuum spectrum of more than 300nm is obtained at 1550nm and 1290nm using doped-silica glass, 45cm long, integrated spiral waveguides. Different dynamics near two distinct zero dispersion wavelengths are observed and explained theoretically.
We demonstrate an integrated, CMOS compatible, multiple wavelength source based on hyper-parametric oscillation via MI (FWM) gain in a high index doped silica glass ring resonator. We obtain lasing with wavelength spacings from 200 GHz to > 6 THz, with a threshold of 54 mW. This device has promise for telecommunications and on-chip WDM optical interconnects for computing.
Sub-ps pulse compression is demonstrated by using an integrated nonlinear chirper based on an integrated, low loss, low dispersion, high index glass (Hydex??) spiral waveguide. Compressions of 40% are demonstrated for peak power around 100 W.
Two-photon absorption based photodetection at 1550 nm is shown using a GaAs multiple-quantum well waveguide laser structure. A large efficiency is determined and we demonstrate its application for autocorrelation of 100 fs pulses with sub-watt peak powers.
We report ultra low power four-wave mixing in a zero-dispersive and two-photon adsorption free micro-ring resonator. A nonlinear wavelength conversion with an internal efficiency as high as -26 dB has been experimentally achieved over a tuning range of 18 nm. The theoretical model predicts a phase-matching range larger than 100 nm.
We show that temporal pulse compression can be achieved by using an integrated, low dispersion, high index glass (Hydexreg) waveguide. Sub-ps compression is demonstrated for peak powers lower than 100 W using a 45 cm spiral waveguide.
By exploiting the excellent nonlinear properties of a novel silica based low-loss high index glass (Hydex reg), we demonstrated low peak power, efficient ps pulse compression in a 45 cm spiral waveguide.
We report the first demonstration of two-photon photocurrent in a GaAs/AlGaAs multiple quantum well laser at 1.55 mum. We measure the device efficiency, sensitivity, as well as the two-photon absorption coefficient. The results show that the device has a strong potential for signal processing, autocorrelation and possibly two-photon source applications at sub-Watt power levels.
We demonstrate four-wave-mixing with <5 mW CW pump power in high-index, doped silica glass micro-ring resonators. We also demonstrate efficient self-phase modulation for pulses with <100 W peak power, with negligible nonlinear absorption up to 25 GW/cm2.
We introduce a general linear pulse-shaping approach based on III-V integrated single-waveguide Bragg gratings for synthesizing arbitrary complex waveforms with (sub-)picosecond resolutions. Pulse code generators at 500 Gbps are demonstrated.
We report wavelength conversion of ultra-low power CW light in integrated silica glass micro-ring resonators via four-wave-mixing in the C-band, as well as strong self-phase modulation of < 100 W peak power optical pulses in a 45 cm waveguide.
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