PHOTONICS
(objectives)
The course provides students with the fundamentals of the operation, design and characterization of a fiber optic link. Starting from the basics of guided optics, the main active and passive photonic devices are described, such as semiconductor lasers, LEDs, optical amplifiers, filters, modulators, multiplexers, etc. .., highlighting for each of them the key features and limitations.
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Teacher
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CINCOTTI GABRIELLA
(syllabus)
• Reflection and interference phenomena Maxwell's equations; Helmholtz’s equation; constitutive equations; spherical and plane waves; reflection and refraction laws; total internal reflection; Fresnel coefficients; etalon; Fabry Perot interferometer; interference between two or more waves; diffractive gratings; thin lens; spherical mirrors; image formation.
• Guided wave optics Planar waveguides: dispersion equation; optical modes; coupled waveguides. Optical fibers: modes in a step-index fiber; multimode fibers; chromatic dispersion; non-linear effects: SPM, XPM, FWM, Raman scattering; WDM; design guidelines.
• Photonic Integrated circuits Planar lightwave circuit (PLC) devices: power splitters; directional couplers; Mach Zehnder interferometer; optical filters; wavelength multiplexers; MMI coupler, Bragg grating,
• Wave optics Plane wave expansion; angular spectrum representation; Rayleigh-Sommerfeld equation; Fresnel and the Fraunhofer approximation; diffraction from a rectangular and a circular aperture; paraxial wave equation; Gaussian beams; optical resonators; effect of a lens on a Gaussian beam; effect of a lens on the field propagation; optical resolution.
• Imaging and spectroscopy Image formation with coherent and incoherent illumination; resolving power; numerical aperture; cameras; microscopes; optical spectrometer; blazed gratings; Fourier spectroscopy.
• Polarization and optical anisotropy Polarization states; Jones calculus; Stokes parameters; Poincarè sphere; anisotropic crystals; half-wave plate, quarter-wave plate; liquid crystals.
• Laser and LED Einstein equations; absorption and emission in a semiconductor; optical density of the states; LED, OLED; semiconductor lasers; rate equations; FP and DFB lasers.
• Optical Receivers PIN and avalanche photodiodes; noise; bit error rate (BER); Q parameter; eye diagram; sensitivity; quantum limit of photodetection.
(reference books)
Gori - Elementi di ottica Dispense fornite dal docente
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Dates of beginning and end of teaching activities
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From 02/10/2017 to 19/01/2018 |
Delivery mode
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Traditional
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Attendance
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not mandatory
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Evaluation methods
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Oral exam
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