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Module I
Optical Fibres : Graded index and step index fibres - refractive index profiles, numerical aperture propagation of optical beams in fibres. Mode characteristics and cutt off conditions (mathematical derivations required). MCVD technique for fibre fabrication. Losses in fibres - attenuation, absorption, scattering and radiation losses. Signal distortion - Intra model and inter model distortion - group delay, material and wave guide dispersion.
Module II
Optical sources : Light Emitting Diodes - LED structures - surface and edge emitters, mono and hetero structures - internal - quantum efficiency, injection laser diode structures - comparison of LED and ILD
Optical Detectors : PN junction photo diodes, PN Photo detectors, Avalanche photo diodes, construction, characteristics and properties, Comparison of performance.
Optical Amplifiers (OAs) : Need for OAs, Principles of operations of various OAs - SLAs, fibre amplifiers(FRA, FBA, EDFA). Comparison of performance.
Module III
Optical communication systems: Direct detection and heterodyne receivers. SNR, advantage of coherent optical communications. Optical digital communications, Transmission link analysis, point to point links-system consideration - link power budget and rise time budget. Introduction to Solitons - Soliton communications using lumped amplifiers, Bit error Rate performance.
Text Books: -
Module I : Ref (1)
Module II : Ref (1), Ref (2) (ch 6)
Module III : Ref (1), Ref (3) (ch 4 & 5), Ref (2) (ch 5)
References: -
1. Gerd Keiser. Optical Fibre Communications, Mc Graw Hill
2. G.P. Agarwal. Non linear Fibre Optics , Academic Press.
3. Robert M.Gagliardi & Sherman Karp. Optical Communications, Wiley Series in Telecommunication & Signal Processing.
4. M.F.J. Digonnet. Rare earth doped fibre Lasers and Amplifiers, Marcel Dekker
5. A. Hasagawa. Solitons in Optical Communications.
Question Paper: -
The question paper will consist of two parts. Part I is to cover the entire syllabus, and carries 40 marks. This will contain 10 compulsory questions of 4 marks each. Part II is to cover 3 modules, and carries 60 marks. There will be 3 questions from each module (10 marks each) out of which 2 are to be answered. |
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