BPM study of wavelength dependent of new design of variable x-coupler waveguide passive device

A new passive x-coupler waveguide optical device is proposed and its coupling behaviour in response to different wavelengths is studied using the beam propagation method. The coupling behaviour of 0.86 /spl mu/m, 1.3 /spl mu/m and 1.55 /spl mu/m wavelengths in this silica-based waveguide coupler is different for each wavelength. The device can behave as a WDM multiplexer, where each wavelength automatically selects its own output arm.