University of California, Santa Barbara Department of Electrical and Computer Engineering Course Syllabus ECE 135 Optical Fiber Communications 4 units Catalog Description: Optical fiber as a transmission medium, dispersion and nonlinear effects in fiber transmission, fiber and semiconductor optical amplifiers and lasers, optical modulators, photo detectors, optical receivers, wavelength division multiplexing components, optical filters, basic transmission system analysis and design. Prerequisites: ECE 134, ECE 132 or equivalent or consent of the instructor. Text, References, and Software: Fiber Optic Communication Systems, Govind P. Agrawal, Wiley Interscience. Fiber Optic Networks, Paul E. Green, Jr., Prentice Hall. Course Goals: 1. Optical fibers, and fiber transmission 1. Introduce one dimensional wave equation, concept of waveguiding and modes, understand modal analysis of the step index optical fiber, be able to differentiate between single and multi mode fibers 2. Learn how to describe pulse propagation on single and multi mode fiber, understand chirped pulse propagation, understand modal dispersion, group velocity and polarization mode dispersion 3. Learn fiber fabrication techniques, able to understand different fiber types such as dispersion compensating fiber, large effective area fiber, negative dispersion fiber, dispersion-flattened fiber 4. Learn how to calculate bit rate-distance product limitations due to linear impairments, learn how to compensate for dispersion, understand nonlinear impairments in fiber transmission 2. Optical sources and transmitters 1. Understand basic concepts of absorption, spontaneous and stimulated emission, optical gain in semiconductors, pn junctions and band structure 2. Understand laser action, use previous concepts to learn semiconductor lasers, doped fibers and doped fiber lasers, be able to calculate internal, external and slope efficiencies 3. Be able to understand direct modulation of semiconductor lasers and limitations due to chirp, be exposed to the concept of mode locking and tunable lasers 3. Optical detectors and receivers 1. Learn principles of detection, internal and external quantum efficiency and responsivity2. Understand photoconductive detectors and photovoltaic detectors, understand basic principle of operation of p-i-n detectors and avalanche photodiodes 3. Be able to estimate the speed limitations of a given detector 4. Understand shot noise, thermal noise and excess noise in detectors, be able to calculate the sensitivity of a given receiver 4. Modulators 1. Learn electroabsorption modulators, directional coupler and Mach-Zehnder modulators 2. Understand modulator chirp and extinction ratio, learn limitations to the speed of modulators and understand how traveling wave modulators can beat the RC limitation imposed by the electrode capacitance 3. Be exposed to LiNb03, GaAs and InP modulators 5. Tunable filters 1. Learn the basic principle Fabry Perot and thin film filters 2. Learn how to use directional couplers and Mach-Zehnders as filters 3. Understand the basic concept of arrayed waveguide multiplexer and demultiplexer 6. Optical amplifiers 1. Learn how to use a pumped semiconductor, a doped fiber and a regular fiber as an optical amplifier, be able to differentiate between Raman amplifiers and doped fiber amplifiers 2. Learn the basic concept of gain saturation and recovery; understand the cross phase and cross gain modulation in amplifiers under multi wavelength operation 7. System design and performance 1. Understand bit error rate, Q factor and signal to noise ratio in intensity modulated systems and be able to relate these parameters top one another 2. Be able to calculate the power budget, understand limitations due to dispersion, chirp, extinction ratio, timing jitter and nonlinearities, be able to estimate the limitations of a given system due to these impairments 8. Transmission systems 1. Introduce point-to-point links and amplified links and be able to calculate the limitations to a system in terms of bit error rate propagation distance product 9 Fiber optic networks 1. Elementary understanding of TDM networks and limitations 2. Elementary understanding of WDM networks and limitations Class/Laboratory Hours: 3 hours of lecture 1 hour of discussion Contribution to Program Outcomes: Course Goals P1 P2 P3 P4 P5 P6 1.1 X X 1.2 X X 1.3 X 1.4 X X 2.1 X X 2.2 X X 2.3 X X 3.1 X X 3.2 X XCourse Goals P1 P2 P3 P4 P5 P6 3.3 X X 3.4 X X 4.1 X 4.2 X 4.3 X 5.1 X 5.2 X 5.3 X 6.1 X X 6.2 X X 7.1 X X 7.2 X X 8.1 X X 9.1 X 9.2 X Contribution to Criterion 5: Design projects in 1.4, 7.2, and 8.1 require the design of various links and systems using different fibers, wavelengths and bit rate, hence require trade offs between the link span and bit rate. This is real life engineering example combining the background gained in ECE 134 and 132. Prepared by: Nadir Dagli Date: May 30,