Abstract
Wavelength multi/demultiplexers with 1 nm spacing have been realised with an asymmetric 2/spl times/2 Mach-Zehnder interferometer in silica-on-silicon. Heating one arm of the interferometer allows for wavelength tuning or wavelength switching of the outputs. Switching or tuning over 1 nm is achieved with only 95 mW within rise and fall times added to of 150 and 220 /spl mu/s, respectively. Tuning and switching can be separated, as temperature changes in the substrate also result in wavelength shifts.
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