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A widely tunable coupled-ring-reflector filter based on compact polymer waveguide is fabricated and the characteristics are measured. The ring radii of two rings are slightly different, which are 150 and 156 m, to achieve wide tuning of 43 nm using a low heating current as small as 37 mA.
A widely tunable add/drop filter composed of double ring resonators is implemented with high- index-contrast polymer waveguide. The drop response gets enhanced by more than 25% at the wavelength where both rings resonate, which makes this device suitable for wavelength selective component in realizing widely tunable hybrid laser diode.
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