Learning objectives
<br />The objective of the course is to give an understanding of fiber optic technology and its related devices.
Prerequisites
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Course unit content
<br />Simmetric slab.<br />Optical fiber. Numerical aperture. V-number. Fractional refractive index difference. Step-index fiber. TE, TM, EH e HE guided modes. Weakly guiding fiber. LP guided modes. Power confinement factor and its dependence on V-number. Gaussian approximation: spot size and mode field diameter. Graded index and matched cladding fibers.<br />Fiber trasmissive properties: attenuation. Intrinsic and extrinsic attenuation causes. Rayleigh scattering. Macro and micro-bending losses. Ultra violet and infra-red absorption. Data sheets of commercial fiber types.<br />Fiber trasmissive properties: dispersione in fibra. Intermodal and Intramodal dispersion. Cromatic Dispersion. Dispersion Shifted Fibers (DSFs), Non-Zero Dispersion Shifted Fibers (NZDSFs), Dispersion Compensating Fibers (DCFs). Example of a DCF design.<br />Plastic optical fibers: material, attenuation, core and del cladding diamaters.<br />Optical amplification principles. Population rate equations. Four, three and two levels systems. Propagation rate equations. Absorption and gain coefficient.<br />Rare earth doped fiber amplifies. Design, schemes, forward and backward pumping, gain, noise figure. Evolution of signals, pumps and ASE powers along the fiber.<br />C, L, and S band optical amplification. Silicate, tellurite and florurate fibers. Fiber lasers.<br />Light emitting diode (LED) e Laser. Designs and physical operation principles.<br />Single longitudinal mode lasers. DFB e DBR. Tunable lasers.. <br />Vertical Cavity Surface Emitting Lasers (VCSELs) Performances and advantages.<br />Receivers. Photodetectors. <br />Photodiodes. PIN, Avalanches photodiodes. Noise sources.<br />Passive Components. Couplers/splitters. Wavelength Division Multiplexers and Demultiplexers (WDM MUXs/DEMUXs). Isolators, Circulators and Attenuators.<br />
Full programme
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Bibliography
<br /><br />B. E. A. Saleh, M. C. Teich, "Fundamental of Photonics", Wiley Interscience, 1991.<br /><br />D.K. Mynbaev, L.L. Scheiner, "Fiber-Optic Communications Technology“, Prentice Hall, 2001.<br />J. A. Buck, “Fundamentals of Optical Fibers”, John Wiley & Sons, 1995.<br />J.M. Senior, “Optical Fiber Communications”, Prentice Hall International Series in Optoelectronics, 1992.
Teaching methods
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Assessment methods and criteria
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Other information
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