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Total internal reflection optical switches structures are well known. However, previously reported switches based upon carrier injection have suffered from the diffusion of carriers within the guiding layer leading to inefficient reflection. While some attempts have been made to restrict the diffusion of carriers in devices fabricated in materials other than silicon, carrier diffusion has still been...
In this paper we present preliminary experimental results of an improved dual grating-assisted directional coupler. As the top SiON layer is thicker, the total insertion loss is reduced, and coupling efficiency significantly increased in the L-band wavelength region, compared to the previously reported results. The coupling efficiency is in the 42-56% range for both C- and L-band wavelength regions...
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