A novel method for tuning the centre wavelength of silica waveguide type Mach-Zehnder multi/demultiplexers (MUX/DEMUXs) has been devised. This tuning is achieved by irradiating a CO2 laser beam onto either arm of the Mach-Zehnder interferometer. In a MUX/DEMUX for channel spacing of 20nm, the centre wavelength is tuned about 3nm and the results closely agree with the calculation.
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Uetsuka et al. (1990) studied this question.
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