Recent Advances of All-Fiber Tunable Filter and Its Applications to Reconfigurable WDM Add/Drop Module and Tunable Receiver

In this paper, we report our recent progress in the development of all-fiber tunable filters and their applications to a reconfigurable WDM add/drop module and tunable receiver. The major advances on tunable filters include (1) developing a precise-four layer model that provides a very useful guide for the filter design and fabrication, (2) designing and synthesizing nanocomposite electro-optic polymers so that one can not only tune the refractive index of the polymer via electro-optic polymer but can also adjust the biasing point of the refractive index via controlling the concentrations of nanoparticles