Theoretical investigations of electro-optical synchronisation of self-pulsating laser diodes (original) (raw)
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All-optical synchronization of self-pulsating laser diodes
Applied Physics Letters, 1996
We examine the behavior of self-pulsating laser diodes when injected with periodic optical signals. We experimentally and theoretically investigate the phase difference between the injected optical signal and the synchronized self-pulsating laser diode emission. We explore the phase difference dependence on detuning between the laser free-running self-pulsation frequency and the applied signal frequency, and on the injected signal power. The determined sensitive dependence of the phase difference on these factors has important consequences when self-pulsating lasers are used as optical signal processing elements in all-optical communication networks, where such sensitivity may lead to timing problems.
Inverse synchronization in semiconductor laser diodes
Physical Review A, 2001
The study of nonlinear dynamical systems is a subject of much interest, one application being in secure communication systems realized through the synchronization of chaotic dynamical systems. In this paper optical coupling is used to effect synchronization between two diode lasers in a master-slave configuration, and we study the effect of frequency detuning between the master and slave lasers on the character of the observed synchronization. Experimental conditions are found under which the synchronization plot ͑formed by plotting the output power of the slave laser against that of the master at each instant in time͒ makes a transition from a positive gradient to a negative gradient. The appearance of such a negative gradient is a new phenomenon, to our knowledge, which we term ''inverse synchronization.'' A rate-equation model is proposed which accounts for light injection into the slave laser, and which agrees with the experimental results. Using this model, we etablish that inverse synchronization is caused by nonresonant coupling between the master and slave lasers.
Synchronization of delay-coupled oscillators: A study of semiconductor lasers
Physical review letters, 2005
Two delay-coupled semiconductor lasers are studied in the regime where the coupling delay is comparable to the time scales of the internal laser oscillations. Detuning the optical frequency between the two lasers, novel delay-induced scenarios leading from optical frequency locking to successive states of periodic intensity pulsations are observed. We demonstrate and analyze these dynamical phenomena experimentally using two distinct laser configurations. A theoretical treatment reveals the universal character of our findings for delay-coupled systems.
Synchronization of semiconductor laser on picosecond pulses
Physics and Simulation of Optoelectronic Devices Xvii, 2009
We show for the first time to our knowledge, synchronization between two bulk semiconductor lasers on an erratic train of pulses. They occurred erratically at different times, following a Poisson statistical law on the scale of the nanosecond. These pulses are due to excitability using an optically injected bulk semiconductor laser. Synchronization between two lasers is shown and studied cascading two optical injection schemes. The degree of correlation between the two signal outputs is analyzed following the detuning and the injected power and is related to the standard map of dynamics for optically injected laser, seeded by a continuous wave. The synchronization on a single pulse is studied as well as on a regular temporal train of pulses and we show that the birth of synchronization is obtained for injected power related to a saturation process in the laser. A comparison to quantum dash and quantum dot laser is discussed.
Synchronization properties of two mutually delay-coupled semiconductor lasers
Journal of the Optical Society of America B
This paper reports a detailed numerical study of the synchronization properties of two mutually delay-coupled semiconductor lasers in the framework of the Lang-Kobayashi model. By computing high-definition stability diagrams, we predict the complex distribution of periodic and chaotic laser oscillations on the coupling versus detuning control parameter plane. Such diagrams provide details concerning the behavior of the laser intensities, quantify objectively the synchronization between their electric fields, and display in-phase and out-of-phase laser behavior. In addition, we also describe the presence of a conspicuous abrupt change in the optimal shift for the greatest value of the cross-correlation function when varying the detuning between the optical angular frequencies of the lasers.
Optical phase dynamics in mutually coupled diode laser systems exhibiting power synchronization
We probe the physical mechanism behind the known phenomenon of power synchronization of two diode lasers that are mutually coupled via their delayed optical fields. In a diode laser, the amplitude and the phase of the optical field are coupled by the so-called linewidth enhancement factor, alpha\alphaalpha. In this work, we explore the role of optical phases of the electric fields in amplitude (and hence power) synchronization through alpha\alphaalpha in such mutually delay-coupled diode laser systems. Our numerical results show that the synchronization of optical phases drives the powers of lasers to synchronized death regimes. We also find that as alpha\alphaalpha varies for different diode lasers, the system goes through a sequence of in-phase amplitude-death states. Within the windows between successive amplitude-death regions, the cross-correlation between the field amplitudes exhibits a universal power-law behaviour with respect to alpha\alphaalpha.
2006
Chaos synchronization in semiconductor lasers is a subject of much interest because of its applications to optical communications, and is also studied as a fundamental property of coupled, time-delay systems. Such phenomena have been found for various configurations and laser devices, including all-optical [1–5] and optoelectronic [6, 7] feedback scenarios, including unidirectional and mutual coupling. In addition, in several such systems, research has shown that different forms of synchronization can exist.