Abstract
A simple and accurate analysis of mode coupling characteristics in fused 2 × 2 fiber-couplers is presented. The model is based on a combined perturbation correction technique and semivectorial field correction scheme of mode analysis. Realistic model of taper profile and coupler cross section owing to fabricated structures, in the framework of polarized supermode-beating description, successfully interprets a variety of measured coupler characteristics. With the inherent accuracy of finite difference algorithm, the analytical basis of perturbation correction method enables the mode convergence abruptly fast as required for a design analysis. Typical results of our method and comparison with measured coupler characteristics show the efficacy of our model as an accurate and efficient design recipe.
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