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Light coupling and propagation in a fiber–dielectric-slab composite with a conductor cladding

A theoretical presentation of evanescent coupling is offered, with consideration of the refractive indices, between a side-polished optical fiber and an infinite planar waveguide with a conductor cladding (PWGCC). The PWG is suspended at a constant distance from an unclad fiber core and coated with a perfect conductor on the far side. The behavior of the distributed coupler is examined using a coupled mode model, which takes account of the two dimensions of the waveguide configuration. The coupling and propagation of light were found to depend on both the relation between the refractive indices of the materials and the configuration of the side-polished fiber used in the PWGCC. The spreading of light in the unconfined direction of the PWGCC is described in terms of a simple geometrical interpretation of the synchronization condition that is in agreement with a previous investigation of the problem based on the coupled mode theory. The power of the light propagated in the fiber decreases exponentially along the fiber axis as power is transferred to the PWGCC, where it is carried away. Then a 3-D finite-difference beam propagation method was applied to the fiber-PWG composite; results of the simulation by this means presented.