Optical Communication course:

Optical Communication course:

Unit I: Introduction to Optical Fibers

  • General optical fiber communication system
  • Basic optical laws and definitions
  • Optical modes and configurations
  • Mode analysis for optical propagation through fibers
  • Modes in planar waveguide and cylindrical optical fiber
  • Transverse electric and transverse magnetic modes
  • Fiber materials and fabrication techniques
  • Classification of optical fibers: single-mode and graded-index fibers

Unit II: Transmission Characteristics of Optical Fiber

  • Attenuation and absorption
  • Scattering and bending losses
  • Core and cladding losses
  • Signal dispersion: inter-symbol interference and bandwidth
  • Intra-modal dispersion: material and waveguide dispersion
  • Polarization mode dispersion
  • Dispersion optimization of single-mode fiber
  • Characteristics of single-mode fiber: R-I profile, cutoff wavelength, dispersion calculation, mode field diameter

Unit III: Optical Sources and Detectors

  • Sources:
    • Intrinsic and extrinsic materials
    • Direct and indirect band gaps
    • LED structures: surface-emitting and edge-emitting LEDs
    • Quantum efficiency and LED power
    • Light source materials and modulation of LEDs
    • Laser diodes: modes, threshold conditions, rate equations, external quantum efficiency, resonant frequencies, structures, and radiation patterns
  • Detectors:
    • PIN photodetectors and avalanche photodiodes
    • Photodetector noise: noise sources and SNR
    • Detector response time and avalanche multiplication noise
    • Temperature effects and comparisons of photodetectors

Unit IV: Optical Receiver, Measurements, and Coupling

  • Fundamental receiver operation and preamplifiers
  • Digital signal transmission and error sources
  • Front-end amplifiers and digital receiver performance
  • Probability of error and receiver sensitivity
  • Quantum limit
  • Optical power, attenuation, and dispersion measurements
  • Fiber numerical aperture, cutoff wavelength, and diameter measurements
  • Source to fiber power launching and lensing schemes for coupling management
  • Fiber to fiber joints, LED coupling to single-mode fibers, fiber splicing, and optical fiber connectors

Unit V: Optical Communication Systems and Networks

  • System design considerations
  • Point-to-point link design: link power budget and rise time budget
  • Wavelength Division Multiplexing (WDM) and passive DWDM components
  • Elements of optical networks: SONET/SDH, optical interfaces, SONET/SDH rings, and networks
  • High-speed lightwave links, OADM configuration, optical Ethernet, and soliton communication

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