Guido Giuliani, Ph.D.
Associate Professor

Optoelectronics Group
Dipartimento di Elettronica
Università di Pavia
Via Ferrata 1
I-27100 Pavia, Italy

Tel. +39 0382 985 224

Fax +39 0382 422 583


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Curriculum Vitae
(in italiano)

Research Activity

Guido Giuliani carries out experimental and theoretical research in the field of optoelectronics and photonics.



Project name


Project title "Integrated Optical Logic and Memory using Ultra-fast Micro-ring Bistable Semiconductor Lasers" 
Guido's role Principal Investigator for University of Pavia
Funding 168 k€          (total 1.25 M€)
Funded by European Commission FP6 
Duration 2006-2009    (36 months)
Goal Demonstrate ultrafast all-optical digital memories
Partners University of Bristol, University of Glasgow, Vrije Universiteit Brussels, Universitat Illes Balears, Intense Ltd., Nokia-Siemens


Project name


Project title "mm-wave signal generation using DFB lasers" 
Guido's role Principal Investigator for University of Pavia
Funding 164 k€          
Funded by Fondazione CARIPLO (Bank foundation)
Duration 2008-2010    (24 months)
Goal Generate spectrally pure tunable mm-wave signals
Partners University of Glasgow, Universitat Illes Balears


Project name

COST 288

Project title "Nanoscale and ultrafast photonics" 
Guido's role Vice-chair and Grant Holder for University of Pavia (2006-2008)
Funding 150 k€          (total 400 k€)
Funded by COST European Science Foundation
Duration 2003-2008    (60 months)
Goal Collaborative research on Nanoscale and Ultrafast Photonics - Materials, Physics of Devices, Ultrafast effects
Partners more than 30...

COST 288 Website

Research Topics

Guido Giuliani's main research topics are listed below; active links take to research activity description.


Semiconductor integrated ring lasers and ring laser gyroscopes [1998 - ]

Scope. Design, fabrication, experimental characterization and modelling of semiconductor ring lasers (SRLs). 
Applications. Optical memories, optical bistables, integrated laser sources for fiber-optic communications, inertial rotation sensors (gyroscopes).
Collaborations. IOLOS project consortium


A comprehensive technological, experimental and theoretical research activity carried out to understand and exploit the characteristics of monolithic semiconductor ring lasers


  • Demonstration of bistable and all-optical Flip-Flop operation of SRLs at 10 Gb/s, with switching times of 20 ps

  • First report of bidirectional regime with alternate oscillations in SRLs

  • Joint experimental and theoretical analysis of SRLs using a two-mode model with conservative and dissipative scattering coefficients
    (see publications page for more details)



RF/mm-wave generation with optoelectronic techniques +  Mode-Locked semiconductor lasers [2002 - ]

Scope. Design, fabrication and testing of integrated semiconductor devices aimed at the generation of RF and millimeter-waves by all-optoelectronic techniques. Frequencies of interest: 10-3000 GHz.
Applications. Wireless communication systems (base station and mobile terminal), radioastronomy, THz imaging.
Collaborations. University of Glasgow , Universitat Illes Balears.


Suitable optoelectronics techniques are studied for the generation of RF and millimeter-waves with high spectral purity (narrow linewidth, low phase-noise). Possible approaches are:
1. Photomixing: generation of electrical frequencies from the beating of two CW laser sources on a high-speed photodetector.
2. Mode-Locking Lasers (MLLs), either of the conventional type or Colliding Pulse
Mode-Locking (CPM)


  • Experimental study of the effect of optical feedback on MMLs

  • First demonstration of phase-locking of two DFB lasers mutually coupled via Four-Wave-Mixing 



Semiconductor laser interferometry and sensing based on self-mixing configuration - Effects of backreflections into semiconductor laser cavity [1995 - ]

Scope. Experimental and theoretical study of semiconductor lasers in the presence of optical feedback from external distant reflectors. 
Applications. Understanding of semiconductor laser dynamics, laser interferometry, laser vibrometry, optical metrology, semiconductor laser parameter extraction.
Collaborations. Ecole des Mines de Nantes; Univ. of Tolouse; University of Darmstadt; Scuola Normale Superiore di Pisa; Politecnico di Torino


A comprehensive experimental and theoretical research activity is carried out to understand and exploit the characteristics of semiconductor lasers subject to optical feedback. The analysis of the low frequency modifications to the emitted power induced by the position of the external reflector has lead to the development of a new class of laser interferometer, called either self-mixing or optical feedback or backreflection interferometer. Theory is derived from the well-known Lang-Kobayashi equations. 


  • Demonstration of the first self-mixing interferometer

  • Development of prototype instruments for the measurement of remote target displacement, vibration, distance

  • Measurement of semiconductor laser linewidth using a simple experimental set-up

  • Measurement of the linewidth enhancement factor of semiconductor lasers with good accuracy

  • First time measurement of the linewidth enhancement factor of THz Quantum Cascade Laser 


Optical amplifier noise and noise in optical communications [1993 - 1999]

Scope. Theoretical analysis of optical noise in optical amplifiers and optical systems. 
Applications. Fiber-optic communication systems.
Collaborations. E. Desurvire (Alcatel-Alsthom Recherche, France)


A theoretical study on the sources of noise in optical amplification has been carried out, with the aim of developing a new model using semiclassical principles derived from quantum-mechanics theory.  


  • Formulation of a new semiclassical model for the noise of an optical amplifier, based on an equivalent beamsplitter representation

  • Equivalent noise model of an optical amplifier using a particle-like approach

  • Application of the semiclassical noise model to optical fiber links including non-linear effect (parametric amplification of noise)
    (see publications page for more details)


Modelling of semiconductor optical amplifiers [1998 - 2001]

Scope. Theoretical modelling of semiconductor optical amplifiers. 
Applications. Fiber-optic communication systems, all optical processing.
Collaborations. -


Numerical analysis has been carried out to accurately model the behaviour of semiconductor optical amplifiers, with particular care for the noise properties of these devices. The model features longitudinal sectioning of the amplifier, and take into account the spectral characteristics of the ASE noise.


  • Static model for the analysis of the noise performance of conventional and gain-clamped semiconductor optical amplifiers
    (see publications page for more details)