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Double S-bend structure for a compact two mode interference coupler

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Abstract

A double S-bend structure has been proposed for the reduction of coupling length of the 2×2 two mode interference (TMI) coupler. The coupling characteristics of the proposed structure are compared with those of conventional TMI structures using a simple mathematical model based on sinusoidal modes. The longitudinal beat length for the proposed TMI coupler is reduced by 15% of the beat length of a conventional TMI coupler. The effect of power imbalance on fabrication tolerance of the proposed TMI coupler is also studied and compared with other TMI couplers.

© 2011 Optical Society of America

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