Project Description

Obiettivi

LEARNING OUTCOMES:
The goal of the course is to provide knowledge and expertise in the context of the advanced optical communication systems both in optical fibre and in free space (Free Space Optics). The course analyses the characteristics and the performance of optical communication systems both in linear and non-linear regime (Kerr effect, Raman effect, Brillouin effect).

KNOWLEDGE AND UNDERSTANDING:
After the course, the student will be able to understand structure and operation of advanced optical communication systems in optical fibre and in free space both in linear and non-linear regime.

APPLYING KNOWLEDGE AND UNDERSTANDING:
After the course, the student will be able to design advanced optical communication systems in optical fibre and in free space both in linear and non-linear regime.

MAKING JUDGEMENTS:
The student gets used to analyze the different technological choices leading to optimize the performance of advanced optical communication systems in optical fibre and in free space.

COMMUNICATION SKILLS:
The student has to be able to explain the technological choices on which is based the design of advanced optical communication systems in optical fibre and in free space.

LEARNING SKILLS:

The student will be able to design advanced optical communication systems in optical fibre and in free space starting from the technical specifications of the different devices and components by which they are realized.

Programma

Special Optical Fibres
Plastic Optical Fibres (POF).
Photonic Crystals
Photonic crystals optical fibres

Optical Amplifiers
Fundamentals on optical amplification.
3-levels systems; 2-levels systems.
Optical Gain. Gain Saturation.
Noise in optical amplifiers (ASE, Amplified Spontaneous Emission).
EDFA (Erbium Doper Fiber Amplifier).
SOA (Semiconductor Optical Amplifier).
Distributed optical amplification. RAMAN Amplifier.

Birefringence and polarization dispersion
Birefringence.
Differential Group Delay.
PMD (Polarization Mode Dispersion).
Jones matrix.
Polarization representation in the Stokes space.
Stokes vector and Poincaré sphere.
Müller matrix.
Principal States of Polarization.
PMD Dynamical Equation.
PMD statistics.
Effects of the PMD on the performance of IM-DD optical communication systems.
Measure techniques for PMD.
PMF (Polarization Maintaining Fibres).

Optical fibre propagation in non-linear regime
Non-linear Schrödinger Equation.
SPM (Self-Phase Modulation).
FWM (Four-Wave-Mixing).
XPM (Cross-Phase Modulation).
Solitons.

Coherent Optical Communication Systems
Coherent optical systems: homodyne and heterodyne receivers.
Demodulation techniques: coherent, differential, envelope.
Balanced optical receiver. Phase-quadrature optical receiver. Polarization diversity optical receiver.
Phase mo/demodulation techniques (PSK, DPSK).
Amplitude mo/demodulation techniques (ASK – envelope demodulation).
Frequency mo/demodulation techniques (FSK, CPFSK).
Polarization mo/demodulation techniques (PolSK, ASPSK).
Multilevel coherent optical systems (M-PSK, QPSK, QAM, N-SPSK, N-4QSK).

Capacity of the optical fibre communication channel
Capacity of the optical channel in linear regime.
Capacity of the optical channel in non-linear regime.

0 crediti
60 ore di lezione
0year
Laurea Magistrale
0° semester