Integrated silicon photonics directional couplers for WDM applications

Supermode dispersion characteristics of directional couplers in 250-nm silicon-on-insulator substrate are investigated for silicon photonics WDM applications (λ ∼1550 nm). Experimental results of such a directional coupler based 2×2 wavelength interleavers and 1×4 WDM (δλ ∼ 10 nm) are shown to be consistent with semi-analytical theoretical prediction.