Optical Information Propagation and Point-to-Point transmission Systems

Contenu

Course Objectives:
From a capacity, distance and cost need, know how to design an adequate point-to-point transmission system, using high spectral efficiency modulation formats and counteracting long-haul optical propagation impairments.

Syllabus :
• Chapter 1 : Overview of an optical transmission system setup
Historical evolution of fiber optic transmission, growth of the need for capacity, review of technology breakthrough. Transmission setup from transmitter to receiver. Wavelength Division Multiplexing (WDM) principle. Optical amplification and Optical Signal-to-Noise Ratio (OSNR). Transmission system types from access to
submarine ones. Transmission quality criteria.
• Chapter 2 : Transmitter and Receiver design
Design of transmitters, laser sources, direct or external modulation, modulators setup and driving, modulation format implementations. Design of receivers, optical filter, photodiodes, noises, direct or coherent detection. OSNR receiver sensitivity for different modulation formats.
• Chapter 3 : Optical propagation in fibers
Physical constraints of single channel signal propagation, linear effects (loss, dispersion and Polarization Mode Dispersion) , nonlinear effects (Kerr, Raman, Brillouin). Physical constraints of WDM transmission, dispersion wavelength dependency, amplification bands, linear and nonlinear cross-talks. Additional cumulative Amplified Spontaneous
Emission (ASE) noise.Transmission modeling, temporal and spectral representation of signals, constellations, NonLinear Shrödinger Equation (NLSE) and numerical solving. Steps for designing transmission systems.
• Chapter 4 : Transverse view on new optical coherent transmission systems
Recall of the principle of coherent detection and complex modulation formats. Coherent mixer analysis and digital signal processing chain. Electronic dispersion compensation, PMD compensation and electronic polarization demultiplexing, phase and data recovery.