phase solitons emerge from chirally charged chaotic areas

One of the main goals of the MOLOSSE project was to explore alternative approaches for the generation of dissipative solitons in relation to mode locking in semiconductor lasers and so we did. In this work, we show that a ring semiconductor laser submitted to coherent external forcing can host dissipative solitons whose existence is fundamentally based on the oscillatory nature of the laser system. Contrary to most optical solitons, the objects we describe host a chiral charge. The stability of only one of the two possible chiral charges results from the broken parity symmetry in a propagative system with non-instantaneous medium.

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Posted Tue 17 May 2016 02:19:15 PM CEST by Stephane Barland Tags:

nucleating dissipative solitons

I am very happy and proud to write that our recent work on excitable systems with delay was published in Nature Communications. Of course I am heavily biased but still, I believe this work is truly interesting in several ways. Of course there is the fact that we demonstrate storage of information in the phase of an optical beam (instead of power), and the fact that we can not only write, but also erase those phase bits. But the way we arrived to these results and the questions they raise are in my view more interesting than the answers they bring.

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Posted Wed 29 Apr 2015 11:47:38 PM CEST by Stephane Barland Tags:

Some time without update to this website, but many things have happened. I attended several conferences (CLEO in San Jose and International Semiconductor Laser Workshop in Palma de Mallorca, ECOC in Cannes) where I (and Bruno Garbin and François Gustave) presented some of our recent work done in the framework of the MOLOSSE and e-buffo projects. The idea of the e-buffo ("excitabilité et buffer optique") project is to use excitability and delayed feedback as basic ingredients to store phase-encoded optical data.

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Posted Mon 17 Nov 2014 12:24:55 PM CET by Stephane Barland Tags:

localized states analogues The excellent collaboration with Francesco Marino and Gianni Giacomelli has brought its first result: our paper about front pinning and localized states has been published as a Physical Review Letter. Spatially localized structures (in optics but also in many other contexts) are often analyzed as the result of the pinning of fronts connecting coexisting states. One favourable situation for the emergence of spatially localized states is therefore the coexistence of two stationary states, one of which is modulated in space. While this vision works well in the transverse dimension in optical systems, its application to localized structures which form along the propagation direction is tempting but not obvious. In this paper, we analyze phenomena analogue to front pinning and localized states in a system where only temporal effects may take place: a delayed dynamical system.

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Posted Tue 29 Apr 2014 02:21:09 PM CEST by Stephane Barland Tags:

experimental setup Our paper about incoherent triggering of excitable pulses in an injection locked semiconductor laser has appeared in Optics Letters. That is an excellent news from a scientific point of view but not only. This paper is also the first common publication with our collaborators in Cork, so congratulations and many thanks to them, in particular to Bryan Kelleher with whom we set up this collaboration. The paper somehow follows our initial demonstration of the control of excitable pulses but it shows a particularly fascinating feature of excitable systems which we did not really address in that paper.

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Posted Wed 12 Mar 2014 09:14:07 AM CET by Stephane Barland Tags:

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