UNIT I : Lightwave System Components Key elements of optical fiber system, Optical fibers as a communication channel : Optical fiber modes and configurations , Mode theory for circular waveguides, Single-mode fibers, Graded-index fiber structure, Signal degradation in optical fibers.Optical sources : Basic concepts and characteristics of LEDs and LASERs. Photodetectors : Basic concepts, Common photodetectors. (Chapter - 1) UNIT II : Lightwave Systems System architectures, Point-to-Point links : System considerations, Design guidelines : Optical power budget, Rise time budget, Long-Haul systems. (Chapter - 2) UNIT III : Multichannel Systems Overview of WDM, WDM components:2x2 fiber coupler, Optical isolators and circulators, Multiplexers and de-multiplexers, Fiber bragg grating, FBG applications for multiplexing and De-multiplexing function, Diffraction gratings, Overview of optical amplifiers : SOA, EDFA and RFA in brief. (Chapter - 3) UNIT IV : Orbital Mechanics and Launchers History of satellite communication, Orbital mechanics, Look angle determination, Orbital perturbations, Orbital determination, Launchers and launch vehicles, Orbital effects in communication system performance. (Chapter - 4) UNIT V : Satellite Subsystems Satellite subsystems, Attitude and control systems (AOCS), Telemetry, Tracking, Command and monitoring, Power systems, Communication subsystems, Satellite antennas, Equipment Reliability and space qualification. (Chapter - 5) UNIT VI : Satellite Communication Link Design Introduction, Basic transmission theory, System noise temperature and G/T ratio, Design of downlinks, Satellite systems using Small earth stations, Uplink design, Design of specified C/N : Combining C/N and C/I values in satellite links system design examples. (Chapter - 6)
