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A technique for the selective characterization of the losses of the transverse modes propagating in a multimode fiber is presented. The method is based on the implementation of a fiber ring cavity which introduces a frequency discrimination among the resonances of the different modes, thus allowing to investigate them separately. Each mode is excited by locking the laser frequency on the corresponding...
A novel type of high-sensitivity Surface Plasmon Resonance (SPR)-based refractive index sensor is demonstrated, with a Kretschmann prism-coupling setup enclosed in an optical cavity and interrogated by a telecom wavelength laser source. Two thin layers of Au and SiO2 are deposited on the prism (SPR chip). Analogously to the sensors commonly referred as “Intensity modulated SPR sensors”, in the presented...
We report on new concepts of comb-based coherent sources that we apply to high-sensitivity measurements of physical quantities, e.g. trace gas concentration and mechanical strain, through different spectroscopic techniques.
In this paper we propose a Fault Detection and Isolation (FDI) filter design method for Spark Injection Engines. Starting from a detailed nonlinear mean-value representation of the engine, a LPV approximation is obtained based on a judicious convex interpolation of a family of linearized models. A LPV-FDI filter based on a bank of Luenberger observers is synthesized by ensuring guaranteed levels of...
In this paper we propose a Fault Detection and Isolation (FDI) filter design method for Spark Injection Engines. Starting from a detailed nonlinear Mean-value engine mathematical representation, a LPV approximation based on a judicious convex interpolation of a family of linearized models is obtained. An LPV-FDI filter based on the Luenberger observer theory is synthesized by ensuring guaranteed levels...
Two years ago Telecom Italia has started a program to test fuel cell based systems as an alternative to batteries and gensets for the backup power requirements of the telecommunications industry. Fuel cell technology looks very promising for this application and several solutions are being proposed by various manufacturers, so Telecom Italia is continuing the program, testing different systems in...
In this work, we have devised different ways to interrogate a single-mode FBGFP sensor, based on both the PDH lock and a polarization-spectroscopy scheme, which extends the idea of Hansch et al. and exploits the internal fiber birefringence and the additional birefringence induced by the grating-inscription process.
In this work, we demonstrate a mid-IR frequency comb based on a difference-frequency-generation (DFG) process, which takes place in a periodically-poled lithium niobate (PPLN) crystal between a continuous-wave (CW) laser source and a near-IR, fiber-based optical frequency synthesizers (OFS). Then, in order to demonstrate that the generated comb can be properly used as a direct frequency ruler, an...
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