Phase noise in gain-switched semiconductor lasers is relevant in some recent applications in quantum communications like quantum random number generation and quantum key distribution. In this talk we will discuss phase noise statistics obtained when modelling phase fluctuations with standard semiconductor laser rate equations, with their corresponding analogies to one and two-dimensional Brownian motions. We will show that depending on the chosen type of modelling the variance of the optical phase can become infinite when the bias current is below the threshold laser current. Corresponding experimental measurements of the optical phase will also be presented to help to discern between the previous modellings of the phase noise.
Bio: Angel Valle received the MSc and PhD degrees in Physics from the Universidad de Cantabria, Spain, in 1988 and 1993, respectively. During 1994 and 1995 he was a postdoctoral fellow with the University of Bath, UK. In 1996, he joined the Instituto de Física de Cantabria, Universidad de Cantabria, where he is now a Professor. His research interests are in the areas of nonlinear dynamics and noise in semiconductor lasers, and quantum communications.
Register here: https://www.eventbrite.ie/e/characterisation-of-gain-switched-laser-phase-noise-for-quantum-cryptograph-tickets-1255410148549?aff=oddtdtcreator