Abstract
In this work, optimum and robust designs of non-linearly tapered slow light couplers are explored. An optimum design yields a set of design parameters that would result in the best transmission. A robust design yields a set of design parameters that would result in good coupling and low transmission variation in the presence of random fabrication errors. It is shown that the uncertainties in the flat dispersion region affect device transmission more strongly than uncertainties in the linear dispersion region of the coupler. Therefore, moderate-length couplers with relatively longer linear dispersion regions yield more robust performance.
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