Showing papers by "Marc Sorel published in 2004"
TL;DR: This work reports the first experimental observation of modulation instability in a discrete optical nonlinear array and describes the mechanism behind this instability.
Abstract: We report the first experimental observation of modulation instability in a discrete optical nonlinear array.
133 citations
TL;DR: Self-focusing indicating soliton generation when the inclination angle of an input beam is slightly above the Bragg angle is observed and the propagation direction of the emerging gap soliton is influenced by the effect of interband momentum exchange.
Abstract: We report an experimental study of discrete gap solitons in binary arrays of optical waveguides. We observe self-focusing indicating soliton generation when the inclination angle of an input beam is slightly above the Bragg angle and show that the propagation direction of the emerging gap soliton is influenced by the effect of interband momentum exchange.
61 citations
01 Dec 2004
TL;DR: In this paper, the authors investigated the optimisation of the saturable absorber section length for mode-locked ridge waveguide laser in GaAs/AlGaAs double quantum-well material.
Abstract: The optimisation of the saturable absorber section length for mode-locked ridge waveguide lasers in GaAs/AlGaAs double quantum-well material is reported. Mode-locked lasers and colliding-pulse mode-locked lasers were fabricated using a simple self-alignment process. Regime analysis and signal characterisation are performed as a function of the laser cavity and saturable absorber section lengths. Device degradation is evaluated and compared in both configurations. Device performance in the frequency domain is assessed using both an external fast photodiode and the saturable absorber section, and the direct generation of millimetre-wave signal through the saturable section is discussed.
13 citations
28 Mar 2004
TL;DR: In this paper, a GaAs/AlAs superlattice waveguide with ion-implantation induced intermixing was used for quasi-phase matched second harmonic generation.
Abstract: First-order, quasi-phase-matched second harmonic generation is demonstrated with picosecond pulses in a GaAs/AlAs superlattice waveguide where the modulation in the bulk-like second order susceptibility is realised by ion-implantation induced intermixing.
9 citations
01 Sep 2004
TL;DR: In this paper, the authors report on the fabrication, optimisation and characterisation of monolithic mode-locked (MLL) and colliding-pulse (CPM) laser with repetition rate in the range 10-60 GHz.
Abstract: This work reports on the fabrication, optimisation and characterisation of monolithic mode-locked lasers (MLLs) and colliding-pulse mode-locked (CPM) lasers with repetition rate in the range 10-60 GHz. The devices consist of double section split-contact ridge waveguide lasers fabricated in GaAs/AlGaAs double quantum well (DQW) material. For CPM devices, the saturable absorber section was fabricated with a coplanar ground-signal-ground (G-S-G) pad structure. The optimum saturable absorber size for efficient mode-locking is found experimentally. The fabricated devices are characterised in terms of operating regimes (Continuous Wave, Self-Pulsation, Mode-Locking) and the mode-locking signals were observed in the frequency domain using an external fast photodiode. In the case of CPM devices a mm-wave signal could also be extracted directly from the saturable absorber section of the laser using a microwave probe.
7 citations
20 Dec 2004
TL;DR: Heterodyne detection has been used to obtain high resolution optical spectra from a semiconductor ring laser as discussed by the authors, and the spectra have been fitted to an analytic model to extract information about linear and nonlinear mode coupling mechanisms.
Abstract: Heterodyne detection has been used to obtain high resolution optical spectra from a semiconductor ring laser. The spectra have been fitted to an analytic model to extract information about linear and nonlinear mode coupling mechanisms.
6 citations
Proceedings Article•
16 May 2004TL;DR: In this article, single and coupled-microcavity structures linked by first order photonic wire Bragg grating reflectors are presented. Measurements show a strong resonance peak for a single microcavities and simulation shows localised cavity modes.
Abstract: We present single and coupled-microcavity structures linked by first order photonic wire Bragg grating reflectors. Measurements show a strong resonance peak for a single microcavity and simulation of three coupled microcavities shows localised cavity modes
3 citations
01 Sep 2004
TL;DR: In this paper, the authors investigated the optical-to-electrical converted signals of a colliding-pulse passive mode-locked (CPM) laser at 60 GHz in GaAs/AlGaAs double quantum well material, subjected to optical feedback.
Abstract: Semiconductor mode-locked lasers and colliding-pulse mode-locked lasers have proven to be effective sources of pulsed optical signals with repetition rate of several tens of GHz and above. Examples of application can be found in OTDM systems, radio-over-fiber networks, and millimeter-wave generation. This work reports on the characterisation of monolithic colliding-pulse passive mode-locked (CPM) lasers at 60 GHz in GaAs/AlGaAs double quantum well material, subjected to optical feedback. The characteristics of the optical-to-electrical converted signals are investigated both by means of an external fast commercial photodiode and by using the saturable absorber section of the device as an intra-cavity photodetector. The power of the electrical RF signal, linewidth, and central frequency stability are measured in unperturbed condition and under the effect of optical feedback. Measurements demonstrate the deterioration of the electrical properties of the signal as the optical feedback level is increased. The reduction of the stability region for mode-locking operation is also reported.
2 citations
28 Mar 2004
TL;DR: In this paper, the authors investigated the interaction of a highly localized discrete soliton with a wide, tilted beam in a 1D A1GaAs array, and showed that the blocker was able to interact with the beam.
Abstract: We investigated experimentally the interaction of a highly localized discrete soliton ("blocker") with a wide, tilted beam in a 1D A1GaAs array.
2 citations
28 Mar 2004
TL;DR: In this paper, the first experimental observation of discrete gap solitons in binary arrays of optical waveguides is reported, and the propagation direction of the emerging gap soliton depends on the input power as a result of an interband momentum exchange.
Abstract: We report on the first experimental observation of discrete gap solitons in binary- arrays of optical waveguides. We observe the soliton generation when the inclination angle of an input beam is slightly above the Bragg angle, and show that the propagation direction of the emerging gap soliton depends on the input power as a result of an inter-band momentum exchange.
1 citations
20 Dec 2004
TL;DR: In this paper, a novel compact design and single-step dry-etch fabrication method of a passive integrated single-section optical polarization converter based on GaAs/AlGaAs using a waveguide structure with two tilted sidewalls was reported.
Abstract: We report on a novel compact design and single-step dry-etch fabrication method of a passive integrated single-section optical polarization converter based on GaAs/AlGaAs using a waveguide structure with two tilted sidewalls.
02 Aug 2004
TL;DR: In this paper, the collision interactions of a highly localized discrete soliton with a wide, tilted beam in a 1D AlGaAs array were investigated experimentally, and the collision was shown to be stable.
Abstract: We investigate experimentally the collision interactions of a highly localized discrete soliton ("blocker") with a wide, tilted beam in a 1D AlGaAs array.
28 Mar 2004
TL;DR: In this article, the existence of modulational instability in the normal diffraction region and its absence in the anomalous regime was shown in a discrete nonlinear waveguide array.
Abstract: The existence of modulational instability in the normal diffraction region and its absence in the anomalous regime was shown in a discrete nonlinear waveguide array. The gain versus input power and MI periodicity was measured.
20 Dec 2004
TL;DR: In this article, asymmetric Mach-Zehnder interferometers have been fabricated in InGaAs/AlGaInAs using quantum well intermixing using low-loss waveguides, MMI couplers and phase shifters.
Abstract: Monolithic asymmetric Mach-Zehnder interferometers have been fabricated in InGaAs/AlGaInAs using quantum well intermixing. The devices combine low-loss waveguides, MMI couplers and phase shifters. Extinction ratio of more than 22 dB is achieved. Efficient wavelength tunability is demonstrated over a full wavelength period with injection current as low as 15 mA.
01 Sep 2004
TL;DR: In this paper, the authors present experimental results on the auto-correlation and crosscorrelation properties of the two counter-propagating modes of a monolithic semiconductor ring laser.
Abstract: In this work we present experimental results on the auto-correlation and cross-correlation properties of the two counterpropagating modes of a monolithic semiconductor ring laser. The ring laser can operate in a bidirectional regime where the two modes have equal power, and also in a unidirectional regime where one of the modes is almost suppressed. Auto-correlation measurements, that are carried out using an unbalanced Mach-Zehnder fiber interferometer, allows to determine the coherence length and linewidth of the ring laser. Cross-correlation measurements are carried out using a modifed interferometric set-up, and they reveal that the two counterpropagating modes are phase-locked.