logo_upc2.jpg  Nonlinear dynamics of semiconductor lasers

 

 

Semiconductor lasers (or laser diodes) are important practical devices, widely used in optical communications, optical signal processing, and life science applications (imaging, sensors, etc.). While “solitary” diode lasers emit a stable output, under external perturbations these lasers display a wide range of nonlinear behaviors that can be exploited for applications.

 

The research in our lab is focused in the influence of optical feedback and/or optical injection. We study the regime of low-frequency fluctuations, in which the laser intensity exhibits abrupt and apparently random dropouts that resemble neuronal spikes. We refer to these dropouts as optical spikes.

 

We are interested in exploring the similarity of optical spikes and the spikes of biological neurons. Establishing a connection between these different dynamical systems can offer new perspectives in both, photonics and neuroscience. Laser-based photonic neurons can provide a novel, inexpensive and controllable experimental set up for improving our understanding of neuronal activity. On the other hand, laser-based photonic neurons can be the building blocks of neuro-inspired, ultra-fast optical computing devices.

 

We are also interested in extreme optical pulses (known as optical rogue waves) induced by optical feedback or injection. Our work is aimed at understanding the mechanisms that trigger them and finding ways to control and predict them.

 

Another research topic is focused on tailoring the amount of speckle generated by diode laser illumination and exploiting speckle patterns for sensing.

 

Recent publications:

 

Machine learning algorithms for predicting the amplitude of chaotic laser pulses

P. Amil, M. C. Soriano, and C. Masoller

Chaos 29, 113111 (2019). Arxiv: 1911.04815.

 

Experimental characterization of the speckle pattern at the output of a multimode optical fiber

D. Halpaap, J. Tiana-Alsina, M. Vilaseca, C. Masoller

Optics Express 27, 27738 (2019).

 

Comparing the dynamics of periodically forced lasers and neurons

J. Tiana-Alsina, C. Quintero-Quiroz, C. Masoller

New J. of Phys 21, 103039 (2019).

 

 

Funding:

 

ITN BEOPTICAL (H2020-675512)

 

ICREA ACADEMIA

 

Ministerio de Ciencia, Innovación y Universidades, PGC2018-099443-B-I00

 

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http://www.fisica.edu.uy/%7Ecris/lasers2_archivos/image010.jpg

Experimental intensity of a semiconductor laser operating in the low-frequency fluctuations regime induced by external optical feedback.

 

Awards:

C. Masoller was elected in OSA Fellow 2016 “For contributions in the area of nonlinear dynamics of optical systems”.

 

http://www.fisica.edu.uy/%7Ecris/osa_award_archivos/image002.jpg 

C. Masoller with A. Wilner (OSA 2016 President), Rochester, US

 

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