Optical Fiber Transmission

Types and structure of optical fibers. Total reflection. Basic parameters of single mode fiber. Multimode fiber. Optical sources and their construction. Photo-detectors. Construction and principle of operation of optical receivers. Design of simple optical fiber links. Structure of optical cables. Other elements of fiber optic links.


Lecture contents

1. Introduction. History of wire communication. Elements of transmission system (1h).


2. Fundamentals of data transmission. Multiplexing (time, space, code, frequency). Modulation (AM, FM, PM). Measures of transmission quality (SNR, BER, eye diagram). Line codes. Scrambling. ISI. Nyquist criteria (4h).
   


3. Optical fiber and its design. Light propagation in optical fibers. Total reflection. Modes. Single mode and multimode fibers. Light attenuation (scattering and absorption). Dispersion: chromatic, material, waveguide, modal. Optical fiber parameters: attenuation, dispersion coefficient, MFD, cut off wavelength, NA, modal bandwidth (11h).



4. Elements of optical fiber transmission link. Transmitters (lasers, LEDs), photo-detectors (p-i-n. avalanche photodiode). Principles of operation, design. Main parameters. Preamplifiers: noise. Receiver sensitivity. Other elements: connectors and splices, couplers, modulators, isolators, EDFA, cables (8h).



5. Design of optical fiber link: energy (power) calculus, bandwidth (4h).



Projects contents
Each student will design its own optical transmission link with given parameters (bit rate, range) based on given elements.

1. J.M. Senior, Optical Fiber Communications, Prentice Hall, New York, edition no earlier than 1992


2. W. van Etten, J. van der Platts, Fundamentals of Optical Fiber Communications, New York, Prentice Hall, 1991


3. G.P. Agrawal, Fiber-Optic Communication Systems, John Wiley, New York, edition no earlier than 1992