Abstract
A novel tunable optical add-drop multiplexer based on a sili- con forward or backward directional coupler is proposed. This device enables one wavelength channel or a small band of channels to be in- serted into or extracted from a wavelenghth-division multiplexing WDM signal with the capability that the wavelength for which this occurs can be varied utilizing injection current variation. For the backward coupling con- figuration, an adjacent sidelobe level rejection of 7.5 dB, coupling effi- ciency of 96.13%, and a 3-dB bandwidth of 0.174 nm with central wave- length at 1549.93 nm are simulated. Wavelength tunability of 169.3 nm forward coupling or 0.78 nm backward coupling result from our simu- lations, corresponding to a voltage-induced refractive index change n of 0.0021. The forward coupling configuration provides a somewhat wider 3-dB bandwidth and more extensive tuning capability. © 2006 Society
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