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The insertion of mobile ions and coupled changes of electron concentration are exploited to induce a non-volatile and reversible change of the optical properties of mixed ionic and electronic conductors (MIECs). The physical mechanisms responsible for the change of the real and imaginary part of the MIECs' refractive index upon ion-intercalation are extensively investigated in the visible and near-IR...
A novel silicon photonics filter enabling single-channel-extraction over a wavelength range wider than the telecom C-band is proposed. An extraction bandwidth of only 15 GHz is demonstrated with off-band rejection of more than 15 dB.
The development of highly non-linear silicon devices is a fundamental step towards the realization of low power optical signal processing devices. In order to achieve this final goal several constraints have to be overcome. In particular, the next generation of opto-electronic integrated devices must be ultra-compact, compatible with foundry model fabrication processing and exhibit low power consumption...
Non-perturbative on-chip light observation is achieved in silicon photonics waveguides by a novel integrated photonic probe. Light intensity monitoring is performed over 40 dB dynamic range, −30 dBm sensitivity, and microsecond scale time response.
For applications in light modulation, biosensing and optical non-linearities on a silicon photonic platform, it is often advantageous to guide the modal power in the lower index cladding material whose properties are tailored for that particular application[ 1,2]. A convenient way of integrating such a scheme is the use of silicon slot waveguides, where two parallel rails, separated by a lower index...
Micro-ring resonators in silicon photonic circuits have been widely studied and implemented in systems for biosensing [1], telecommunications [2] and generation of photon pairs for quantum optics experiments [3]. The resonator Q-factor, defined by the roundtrip loss and coupling coefficient, is typically a static property of the device realised in the design stage. In this work a method by which to...
Silicon photonics is a well established platform for the development of fully integrated optical devices for optical communication systems. In particular, the strong modal confinement typical of silicon waveguides enables the exploitation of nonlinear effects with much lower optical power levels. Different structures for all-optical signal processing have been reported in the last years, such as all...
Evanescent-coupling-induced group velocity dispersion (GVD) in a subwavelength silicon directional coupler is observed to significantly modify four-wave-mixing (FWM) spectra. As the separation between two silicon wires decreases, the increasing dispersion gradually suppresses the FWM gain.
We experimentally and theoretically study coupled semiconductor ring lasers. We report on the destabilization of unidirectional operation for large coupling strengths and the appearance of a coupling-induced bidirectional state, both undesirable for optical memory operation.
This summary describes the development of silicon waveguide photodetectors formed via the controlled introduction of deep-levels to induce sensitivity at wavelengths around 1550nm. This approach is monolithic and CMOS compatible.
Visible light trimming of As2S3-assisted optical waveguides is exploited to compensate for fabrication tolerances and to demonstrate permanent reconfiguration of photonic integrated circuits. Applications to ring-resonator filters and variable delay lines are presented.
We demonstrate that travelling-wave four-wave mixing in coupled resonators overcomes the bandwidth limitations of wavelength conversion in single resonators, preserving the efficiency enhancement: 28-dB gain over silicon waveguides of the same length is here achieved.
We discuss here the potential of compact ring-based high-order photonic integrated filters. Limitations related to fabrication tolerances and parasitic effects in high-index-contrast waveguides are also addressed and adaptive tuning of the filter parameters is proposed and demonstrated as a viable compensation strategy to maintain filter operation.
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.
We present an investigation on the nonlinear dynamics of intense pulses in an AlGaAs Bragg waveguide and we report the experimental observation of an intensity dependent blue-shift of the Bragg notch spectral line.
Spectral broadening in an array of subwavelength silicon waveguides pumped with fs pulses is studied. Adjusting input pulse position, different spectral patterns are observed and explained using the resonant emission from temporal supermode solitons.
Time-domain measurements of dispersion- and nonlinearity-induced chirpings of femtosecond pulses in silicon-on-insulator nanowires reveal nonlinear dispersion compensation. Spectral measurements show pronounced dispersive wave emission by solitons.
We report on the chirp measurements of low peak power optical pulses, generated by AlGaInAs semiconductor mode-locked lasers at repetition frequency of 40 GHz, with a sonogram technique including high-sensitivity TPA waveguide detector.
We show a direct comparison between silicon reconfigurable delay lines based on coupled resonator optical waveguides and photonic crystal waveguides. The structures are used to selectively delay the two orthogonally polarized channels of a RZ-PolDM-DQPSK format at 100 Gbit/s.
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,...
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