EC8751 – NOTES & QP
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| SEMESTER QP | CLICK HERE |
EC8751 – SYLLABUS
UNIT I INTRODUCTION TO OPTICAL FIBERS
Introduction-general optical fiber communication system- basic optical laws and definitions?optical modes and configurations -mode analysis for optical propagation through fibers modes in planar wave guide-modes in cylindrical optical fiber-transverse electric and transverse magnetic modes- fiber materials-fiber fabrication techniques-fiber optic cables?classification of optical fiber-single mode fiber-graded index fiber.
UNIT II TRANSMISSION CHARACTERISTIC OF OPTICAL FIBER
Attenuation-absorption –scattering losses-bending losses-core and cladding losses-signal dispersion –inter symbol interference and bandwidth-intra model dispersion-material dispersion- waveguide dispersion-polarization mode dispersion-intermodal dispersion?dispersion optimization of single mode fiber-characteristics of single mode fiber-R-I Profile?cutoff wave length-dispersion calculation-mode field diameter.
UNIT III OPTICAL SOURCES AND DETECTORS
Sources: Intrinsic and extrinsic material-direct and indirect band gaps-LED-LED structures?surface emitting LED-Edge emitting LED-quantum efficiency and LED power-light source materials-modulation of LED-LASER diodes-modes and threshold conditions-Rate equations-external quantum efficiency-resonant frequencies-structures and radiation patterns-single mode laser-external modulation-temperature effort.Detectors: PIN photo detector-Avalanche photo diodes-Photo detector noise-noise sources-SNR-detector response time-Avalanche multiplication noise-temperature effects?comparisons of photo detectors.
UNIT IV OPTICAL RECEIVER, MEASUREMENTS AND COUPLING
Fundamental receiver operation-preamplifiers-digital signal transmission-error sources-Front end amplifiers-digital receiver performance-probability of error-receiver sensitivity-quantum limit.Optical power measurement-attenuation measurement-dispersion measurement- Fiber Numerical Aperture Measurements- Fiber cut- off Wave length Measurements- Fiber diameter measurements-Source to Fiber Power Launching-Lensing Schemes for Coupling Management-Fiber to Fiber Joints-LED Coupling to Single Mode Fibers-Fiber Splicing?Optical Fiber connectors.
UNIT V OPTICAL COMMUNICATION SYSTEMS AND NETWORKS
System design consideration Point – to –Point link design –Link power budget –rise time budget, WDM –Passive DWDM Components-Elements of optical networks-SONET/SDH?Optical Interfaces-SONET/SDH Rings and Networks-High speed light wave Links-OADM configuration-Optical ETHERNET-Soliton.