Optical Communications

This module covers fiber optic telecommunications systems and networks, performance analysis and improvement solutions.

Understand the physical principles and operation of the main components and transmission systems used in optical telecommunications networks.

Know the different network topologies and know how to evaluate their performance for optical communications.

Physics of semiconductors and optoelectronic components, electromagnetism, guided and fiber propagation.

Recommended prerequisites*:

Signal processing, information theory.

Final examination

• Non-linear phenomena resulting from light-matter interaction (7.5h) :
  • Fundamental concepts of nonlinear optics
  • Presentation of the non-linear effects involved in optical communication systems:
    • Scattering phenomena in fibers (Kerr effect, Raman scattering (SRS), Brillouin scattering (SBS), soliton propagation).
    • Other non-linear effects: wavelength conversion, phase modulation (self phase modulation (SPM), cross phase modulation (XPM), 4 wave mixing (FWM).

• Transmission line for optical communications (9h):
  • Composition of the transmission line (transmitter, receiver, regenerators, optical module of the OLT /ONU (transceiver), coherent detection
  • Information detection: eye diagram, noise calculation, electrical and optical signal-to-noise ratio, sensitivity, bit error rate (BER), jitter phenomenon, error correction code (FEC)
  • Optical modulation and demodulation and coding,
  • Management of losses in optical fibers: optical budget, location of amplifiers, gain equalization, reminder on fiber amplifiers, Raman amplifier, SC.
  • Management of dispersion in fibers: reminder of the problem and compensation methods.
  • Management of non-linear effects

• Networks (9:00):
  • Network topology: long distance, terrestrial, submarine, metropolitan, local, FTTX, SDH/SONET standards
  • Point to point or point/multipoint architecture, PON, WDMPON
  • Consistent detection
  • Multiplexing: TDM, CDM, WDM, SCM, radio over fiber

CM : 25h30

• Nonlinear Fiber Optics, Govind P. Agrawal 5th edition, Elsevier
• Fiber Optic Communication Systems, Govind P. Agrawal 4th edition, Wiley
• Fiber optic communications 4th edition, Pierre Lecoy, Lavoisier hermes