novel tunable wave division multiuse (WDM) device has been formed on a microscope slide substrate. On the surface of the substrate is a K-ion-exchanged directional coupler with zero separation. On the top of the interaction region a Ti-film heater is placed. The operational behavior of the device is controlled by thermo-optical effect, and thus by the current through the Ti-film heater. Operational wavelengths designed for the device are 0.85 and 0.6328 μm. The measured results show that the device has predicted characteristics and thatthe design is reasonable.
"Study of the thermocontrolled wave division multiuse technique based on a two-mode coupling mechanism," Optical Engineering 32(3), (1 March 1993). http://dx.doi.org/10.1117/12.61048