Engineering Tutorials

EE-405-E OPTICAL COMMUNICATION SYSTEMS

CLASS WORK : 50
EXAM : 100

UNIT1 INTRODUCTION TO OPTICAL COMMUNICATION SYSTEMS :

Electromagnetic spectrum used for optical communication, block diagram of optical communication system. Basics of transmission of light rays. Advantages of optical fiber communication.

UNIT2 OPTICAL FIBERS:

Optical fibers structures and their types, fiber characteristics : attenuation, scattering, absorption, fiber bend loss, dispersion; fiber couplers and connectors

UNIT3. LED LIGHT SOURCE :

Light emitting diode : recombination processes, the spectrum of recombination radiation, LED characteristics, internal quantum efficiency, external quantum efficiency, LED structure, lens coupling to fiber, behavior at high frequencies.

UNIT4. LASER LIGHT SOURCE :

Basic principles of laser action in semi -conductors, optical gain, lasing threshold, laser structures and characteristics, laser to fiber coupling, comparison with LED source.

UNIT5 . AVALANCHE AND PIN PHOTODETECTORS:

Principles of optical detection, quantum efficiency, responsivity, general principles of PIN photodetector, intrinsic absorption, materials and designs for PIN photodiodes, impulse and frequency response of PIN photodiodes, noise in PIN Photodiodes, multiplication process, APD Design, APD bandwidth, APD noise.

TEXT BOOK:

Optical Fiber Communications: John M Senior; PHI.

REFERENCE BOOKS :

1. Optical Communication Systems : John Gowar; PHI.

2. Optical Fiber Communications : Gerd Keiser; TMH

3. Optical fiber Communication : Selvarajan, Kar, Srinivas; TMH.

NOTE: Eight questions are to be set at least one question from each unit. Students have to attempt five question in all.

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