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EEC 701
OPTICAL
COMMUNICATION
!
"
The general system
advantages of optical fiber
communications.
Optical fiber wave guides-
Introduction, Ray theory
transmission,
Step Index fibers, Graded Index
fibers.
Mode theory for circular
Waveguides
Single mode fibers- Cut off
wavelength, Mode Field
Diameter
Numerical
Revision
Effective Refractive Index
Fiber Material and its
Fabrication Techniques-1
Fiber Material and its
Fabrication Techniques-2
Signal distortion in optical
fibers- Attenuation, Absorption,
Scattering and Bending losses
Core and Cladding losses
Information capacity
determination, Group delay
Attenuation Measurements
Techniques
Types of Dispersion- Material
dispersion,Wave-guide
dispersion
Polarization mode dispersion,
Intermodal dispersion. Pulse
broadening.
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Overall fiber dispersion in Multi
mode and Single mode fibers
Fiber dispersion measurement
techniques
Non linear effects
Optical fiber Connectors: Joints,
Couplers and Isolators.
Numerical
Revision
Optical sources- LEDs,
Structures
Materials, Quantum efficiency,
Power, Modulation, Power
bandwidth product
Laser Diodes- Basic concepts,
Classifications,
Semiconductor injection Laser:Modes, Threshold conditions,
External quantum efficiency,
Laser diode rate equations,
resonant frequencies, reliability
of LED & ILD
Numerical
Revision
Source to fiber power launching- Output patterns, Power
coupling,
Power launching, Equilibrium
Numerical Aperture
Laser diode to fiber coupling
Optical detectors- Physical
principles of PIN
Physical principles of APD
Detector response time,
Temperature effect on
Avalanche gain
Comparison of Photo detectors.
Optical receiver operation-
Fundamental receiver operation
Digital signal transmission, error
sources
Receiver configuration
Digital receiver performance
