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Digital communications and optical transmissions (09_O-CNO) ​

  • Coefficient : 6
  • Hourly Volume: 150h (including 72h supervised)
    CM : 30h supervised
    CTD : 2h supervised
    TD : 10h supervised
    Labo : 30h supervised (and 12h unsupervised)
    Out-of-schedule personal work : 66h

AATs Lists

Description ​

Have the basic knowledge necessary to understand the techniques used in digital communications and optical transmission systems. Know the different elements of the transmission chain as well as the methods of evaluating transmission quality, modulations and coding techniques.

  • Digital Transmissions
    • Baseband transmission on band-limited channel,
    • spectral characteristics of online codes, intersymbol interference, probability of errors,
    • representation of signals, constellations,
    • architectures of transmitters/receivers, quantities and parameters characteristic of the transmission – reception chain,
    • transmissions on narrow-band carriers,
    • digital modulations (BPSK, QPSK, QAM - Maires, MSK...),
  • Coding of information
    • Model of an information transmission system,
    • source coding, channel coding.
    • application to underwater transmission systems
  • Optical channel transmission systems
    • Optical network topologies,
    • detection, transmitters,
    • all-optical amplification.
    • RF transmissions over fiber,
    • optical signal processing functions.
  • Experimental characterization labs:
    • spectral analysis of laser sources (Fabry-Pérot, DFB),
    • characterization of an external Mach-Zehnder type modulator,
    • studies of the main system parameters of an EDFA,
    • studies of the main system parameters of a SOA.

Learning Outcomes AAv (AAv) ​

  • AAV1 [heures: 30, B1, B2, B3, B4, F1] : The student of the CNO module, at the end of the module, will be able to describe the main elements (active and passive components) of the architecture of a WDM optical communication chain (from transmitter to receiver) and to use the main metrics, tools and methods to evaluate transmission quality.

  • AAV2 [heures: 20, C3, D3, D4, E3, F1] : The student of the CNO module, at the end of the module, in pairs, will be able to use the functionalities of the optical spectrum analyzer (OSA) to carry out the static experimental characterization (losses, gain, SMSR, OSNR, NF) of the components of an optical communication chain comprising a DFB laser, a modulator, an optical fiber of any length and an optical amplifier, and to write a report of studies.

  • AAV3 [heures: 10, C1, C2, C3, D1, D2, D3, D4, F1] : The student of the CNO module, at the end of the module, will be able to dimension and design a communication chain optical communication corresponding to precise and provided specifications and to validate it by means of simulations with dedicated software (for example OptisystemTM from Op-tiwave).

  • AAV4[heures: 20, B3, B4, C1, F1] : The student of the CNO module, at the end of the module, will be able to identify the different constituent blocks of a digital transmission chain (encoders, transmitters, receivers, propagation channel) and to know the role and main characteristics of each element. The student will be able to understand the importance of the concept of entropy in digital transmission and its link with the amount of information contained in a digital signal.

  • AAV5[heures: 20, B3, B4, C1, C2, D1, F1 ] : The student of the CNO module, at the end of the module, will be able to master source coding techniques to compress information efficiently , using methods such as Huffman coding, arithmetic coding, Lempel-Ziv coding. The student will be able to understand how entropy can be used to optimize data compression and digital signal transmission. The student will be able to master different channel error detection and correction techniques, such as linear error correcting codes, Hamming codes, Reed-Solomon codes, etc.

  • AAV6[heures: 21, B2, B3, C2] : The student of the CNO module, at the end of the module, will be able to determine qualitatively, analytically and by simulation the spectral power density and the probability of errors of digital modulations in baseband and on carrier. It will be able to use the information obtained by adapting the signals in terms of waveforms and/or power, to meet the specifications of digital transmission.

  • AAV7[heures: 15, B3, C1] : The student of the CNO module, at the end of the module, will be able to analyze the architecture of digital transceivers. It will be able to determine the influences of their components on the performances in terms of noise factor and non-linearities of the transmission/reception chain, to respect the specifications of a digital transmission.

  • AAV8 [heures: 15, B2, B3, B4, D1, D2, D3, D4, F1] : The student of the CNO module, at the end of the module, will be able to analyze, implement and study the performances (in EVM, SER, BER) of a simple single-carrier (M-QAM, M-PSK) or multi-carrier (CP-OFDM) digital communication chain for a Gaussian or selective additive channel in stationary frequency. The student will also be able to implement some classic algorithms at the receiver level using preamble and pilot symbols (carrier frequency offset correction, synchronization, zero-forcing equalization, linear LMS equalization).

Assessment methods ​

Average of several assessments

Key Words ​

Compression techniques, coding, line codes, inter-symbol interference, bit error rates, digital modulation. Optical Communications, Optical network topology, Link budgets, Component noise, Transmitters for WDM optical networks, Optical amplification, RF over fiber, All-optical functions.

Prerequisites ​

Electronics, signal processing and optics program for semesters S1-S6

Resources ​

Télécommunications 1 : Transmission de l'information, P Fraysse, R Protière, D Marty- Dessus, collections Ellipses.

Théorie de l'Information, application aux techniques de communication, G Battail, ed. Masson.

Fiber-Optic Communication Systems from Govind P. Agrawal (ISBN 0–471–17540–4).

Undersea Fiber Communication Systems from J. Chesnoy (ISBN 0–12–171408–X).

Les télécommunications par fibres optiques de Irène et Michel Joindot (ISBN 2–10–002787–5).