Plataforma de simulación para lazos de sincronización optoelectrónicos con fase continua y conmutada en comunicaciones ópticas coherentes con difusión de fase óptica
J.L. León-Lunaa, A. Arvizu-Mondragónb, J.D. Sánchez-Lópeza, and J. Santos-Aguilarb
a Universidad Autónoma de Baja California (UABC) Carret. Ens.-Tij. Número 3917, Colonia Playitas, Ensenada, B.C., 22860, México.
b Centro de Investigación Científica y de Educación Superior de Ensenada (CICESE) Carret. Ens.-Tij. Número 3918, Zona Playitas, Ensenada, B.C., 22860, México.
]]> Received 6 October 2014;
Resumen
En este trabajo se presentan los principios de los lazos optoelectrónicos básicos para sincronización de fase óptica en comunicaciones coherentes (ópticas clásicas, así como su aplicación a sistemas de comunicaciones cuánticas empleando estados coherentes débiles (WCS). Se abordan dos lazos de fase continua, el OPLL y el lazo de Costas convencional (LCC) además del lazo de Costas con cuadraturas conmutadas (LCCC), mostrando ventajas y compromisos en su diseño. Con el fin de evaluar el desempeño de estos lazos desarrollamos una plataforma de simulación basándonos en el programa VPI Photonics Maker empleando para esto parámetros de componentes comerciales. Así, mediante el uso de la plataforma desarrollada es posible mostrar la equivalencia en desempeño del LCCC con respecto al LCC y que el LCCC puede tener mejor desempeño que el LCC (si es diseñado adecuadamente) en la etapa de recepción de un sistema de comunicaciones cuánticas coherentes empleando WCS con difusión de fase óptica. Dado que las simulaciones se realizaron basándonos en componentes comerciales, es de esperarse que en la implementación práctica se obtengan resultados experimentales semejantes a los de la plataforma de simulación.
Palabras clave: OPLL; estados débiles coherentes; lazo de Costas.
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.
Keywords: OPLL; weak coherent states; Costas loop.
]]>PACS: 42.79.Sz
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