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SYLLABUS
UNIT-I
Overview of optical fiber communication: Historical development, The general system, Advantages of optical fiber communications, Optical fiber wave guides - Introduction, Ray theory transmission, Total internal reflection, Acceptance angle, Numerical aperture, Skew rays, Cylindrical fibers - Modes, Vnumber, Mode coupling, Step index fibers, Graded index fibers. SINGLE MODE FIBERS: Cut off wavelength, Mode field diameter, Effective refractive index, Fiber materials glass, Halide, Active glass, Chalgenide glass, Plastic optical fibers.
UNIT-II
Signal Distortion in optical fibers: Attenuation, Absorption, Scattering and bending losses, Core and cladding losses, Information capacity determination, Group delay, Types of dispersion - Material dispersion, Wave-guide dispersion, Polarization mode dispersion, Intermodal dispersion, Pulse broadening, Optical fiber connectors - Connector types, Single mode fiber connectors, Connector return loss.
UNIT-III
Fiber Splicing: Splicing techniques, Splicing single mode fibers, Fiber alignment and joint loss - Multimode fiber joints, Single mode fiber joints, OPTICAL SOURCES: LEDs, Structures, Materials, Quantum efficiency, power, Modulation, Power bandwidth product, Injection laser diodes - Modes, Threshold conditions, External quantum efficiency, Laser diode rate equations, resonant frequencies, reliability of LED and ILD. Source to fiber power launching: Output patterns, Power coupling, Power launching, Equilibrium numerical aperture, laser diode to fiber coupling.
UNIT-IV
Optical detectors: Physical principles of PIN and APD, Detector response time, Temperature effect on avalanche gain, Comparison of photo detectors, Optical receiver operation - Fundamental receiver operation, Digital signal transmission, Error sources, Receiver configuration, Digital receiver performance, Probability of error, Quantum limit, Analog receivers.
UNIT-V
Optical system design: Considerations, Component choice, Multiplexing, point-to-point links, System considerations, Link power budget with examples, Overall fiber dispersion in multi-mode and single mode fibers, Rise time budget with examples. Transmission distance, Line coding in optical links, WDM, Necessity, Principles, Types of WDM, Measurement of attenuation and dispersion, Eye pattern.
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CategoriesEngineering
Format EPUB
TypeeBook