Plataforma de simulación para lazos de sincronización optoelectrónicos con fase continua y conmutada en comunicaciones ópticas coherentes con difusión de fase óptica

Abstract

On this work we present the basic principles of the optoelectronic loops used for optical phase synchronization in classical optical coherent communications as well as their application to quantum communications systems using weak coherent states (WCS). Two loops of continuous phase, the OPLL and the conventional Costas loop (CCL) as well as the Costas loop with switched quadrature (SQCL) are addressed showing their advantages and their implementation trade-offs. In order to evaluate the performance of these loops a simulation platform is developed based on the VPI Photonics Maker software using parameters of commercial components. Thus, by using the platform developed it may be shown the equivalency in the performance of the SQCL with respect to the CCL and that the SQCL may have a better performance than the CCL (if designed properly) in the receiving stage of a quantum communications system that uses WCS with optical phase diffusion. Since the simulations were performed based on parameters of commercial components, it is expected that a practical implementation will obtain very similar results to those of the simulation platform.