Abstract
An ultra compact tooth shaped grating assisted structure has been studied using a mathematical model based on sinusoidal mode simple effective index method (SEIM) for compact two mode interference (TMI) couplers. The coupling characteristics with variation in number of grating period are also shown. It is seen that the beat length of tooth shaped grating assisted TMI coupler at Δn = 5% is 50% less than that of TMI coupler without grating. The wavelength dependence of power imbalance and the effect of fabrication tolerances on power imbalance are discussed.
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