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In this paper we propose a couple of fractional order observers for nonlinear commensurate fractional order systems i.e. a reduced order observer and a fractional Luenberger observer in the algebraic and differential setting. We introduce the Fractional Algebraic Observability (FAO) property, like a measurement degree of fractional observability of states variables. Finally a comparison between two...
The control of multiterminal HVDC systems based on local variables has shown a better performance, in terms of dynamical response and implementation simplicity, than constant DC voltage and droop control. However, power oscillations can be produced due to the interaction among different HVDC stations. In this paper, a modified control logic for this type of control is proposed in order to reduce the...
High brightness semiconductor laser sources with modulation capacity are emerging candidates for an increasing number of applications. We have recently presented an integrated three section Master Oscillator Power Amplifier (MOPA) [1] to be used in space-borne Random Modulated Continuous Wave (RM-CW) Integrated Path Differential Absorption (IPDA) lidar systems for atmospheric CO2 detection [2]. The...
Numerous applications such as free space optical communications, metrology and differential absorption lidar systems require high brightness laser sources with spectral purity. Monolithically integrated Master Oscillator Power Amplifiers (MOPAs) are promising candidates to fulfil these requirements. In particular, a three-section bent mOpA at 1.5 μm was recently proposed as laser source for an integrated...
We present a high power semiconductor Master Oscillator Power Amplifier monolithically integrated on InP, which includes a modulation section. This device can be used for random-modulation-continuous wave lidar systems or free-space communications.
We present experimental results on the emission characteristics of a 1.5- $\mu$m distributed feedback (DFB) tapered master oscillator power amplifier (MOPA) in a wide range of steady-state injection conditions, showing different dynamical behaviors. A detailed analysis of the optical and radio-frequency spectra has allowed the identification of three different emission regimes: i) stable amplified...
Since the demand of energy with high quality and reliable power is growing and temporary faults in the grid are common, the analysis of unbalanced voltage conditions has become increasingly important. Power converters can control the instantaneous active and reactive power and manage them in order to improve the voltage conditions at the point of common coupling. The current reference generation strategies...
In this contribution, we calculate the noise spectra as function of pump current and complex backscattering coefficients when the SRL is biased in the bidirectional-continuous wave regime. We consider a two mode rate equation model in the Langevin formulation. Within linear approximation, perturbations concerning the total intensity and carrier inversion dynamics decouple from the energy distribution...
A new implementation of Chua's circuit employing unity-gain cells (UGC) as the active building blocks to emulate the behavior of the nonlinear resistor (NR) and the grounded inductor is introduced. The breakpoints and slopes associated to the NR as well as the numeric value of the inductor can be adjusted by the control resistors. The proposed circuit is suitable for implementation with the commercially...
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