Abstract
A tunable wavelength filter array is proposed, which consists of a 1 × 6 multimode interferometer silicon waveguide splitter and Bragg reflector waveguides with ferroelectric liquid crystal (FLC) cladding. The transmission characteristics of the proposed device were reported, which were theoretically and experimentally obtained. Different operating wavelengths were obtained by using different waveguide widths with the same grating period. The stop bandwidth we obtained with a sampled grating was narrower than that in conventional uniform grating structures. Bistable tuning operation with a 0.8 nm shift in wavelength characteristics, which had six different Bragg wavelengths, was demonstrated. The distribution of the optical axis in the FLC cladding layer was also measured using a system for birefringence measurements.
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