Abstract
We analyze the thermal stability of the power transmission efficiency and the extinction ratio in an asymmetric three-core silicon-on- insulator nonlinear directional coupler with variable Gaussian coupling coefficient. Because the refractive indices of Si and SiO2 materials are subject to temperature change, the effective refractive index of the non- linear coupler varies correspondingly. When ratio (LC/b) andT change, the relative transmission efficiency error (� ) values and relative change of extinction ratio (η) values are obtained. It can be easily shown that vari- ation ofand η are negligible under LC/b ≤ 1/2. Therefore, we can set LC/b ≤ 1/2 andT ∈ (-100 K, 100 K) in order to make the power transmis- sion efficiency and the extinction ratio work steadily. This is significant in guiding an actual nonlinear optical pulse switch fabrication. C � 2011 Society
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