Optical Communication And Networking Handwritten Premium Lecture Notes, Prepared by Sukanya. Specially for Electronics And Communication Engineering Candidates. Syllabus Covered based on Anna University Seventh Semester.
CONTENT:
UNIT-1 (Pages:36)
LIGHT WAVE COMMUNICATION SYSTEM
UNIT-2 (Pages:30)
SIGNAL DEGRADATION IN OPTIC FIBER
UNIT-3 (Pages:53)
SELECTION OF MATERIALS FOR LEDS
UNIT -5 (Pages:19)
POINT TO POINT LINKS
Attachment: click hereUNIT-1
LIGHT WAVE COMMUNICATION SYSTEM
Benefits of fiber optic cables
Application
Electromagnetic frequency spectrum
Evolution of fiber optic system
Optical amplifier
Optical sources
Photo detector
WDM (Wavelength Division Multiplexing)
Basic elements of fiber communication system
Optical fiber modes and configuration
Purpose of cladding
Ray optics
Numerical aperature
Mode theory of circular wave guides
1. Guided modes
2. Refracted modes
3. Leaky modes
Overview of modes
Mode coupling
Modes in step index fibers
Single mode fibers
Mode fields diameters
Linearly polarized modes
Graded index fiber
UNIT-2
SIGNAL DEGRADATION IN OPTIC FIBER
Signal attenuation
Attenuation units
Absorption
Atomic defects
Extrinsic
Intrinsic
Scattering losses
Bending losses
Micro bends
Core and cladding losses
Information capacity determination
Matched cladding fibers
Depressed cladding fiber
Cutoff wavelength
Material dispersion
Wave guide dispersion
UNIT-3
SELECTION OF MATERIALS FOR LEDS
Heterojn
Schematic diagram of a DH LED structure with Forward bias
Radiance
Two basic LED configuration
1. Surface emitter LED
2. Edge emitter LEDS
Quantum efficiency and LED power
Recombination
External quantum efficiency
LASER
Population inversion
Threshold condition
Laser diodes
Resonant frequencies
Power launching and coupling
Power coupling calculation
Temperature effects
Modulation of laser diodes
1. Direct modulation
2. External modulator
Lensing schemes for coupling improvement
Fiber splice
Fusion splice
Elastic tube splice
PIN diode
Components of optical receiver
Avalanche photo diodes
Photo detector noise
Dark current noise
Surface leakage current noise
Amplifier
Problems
Photo detector response time
Avalanche multiplication noise
Optical receiver
Digital signal transmission
Error sources
UNIT – 5
POINT TO POINT LINKS
Key requirements
System performance
EDFA
Link power budget
Rise time budget
Noise effects on system performance
Reflection noise
Attachment: click here
