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We demonstrate a novel apodization method for channel-waveguide Bragg gratings. Photolithographically-enabled control of reflective amplitude and phase of individual grating-constituent elements yields devices providing steep-roll-off, flat-top filtering, high (Fourier-transform-limited) resolution, and multipassband spectral decoding.
We report long-period gratings fabricated in various polymer waveguide structures by using the UV-irradiation and the etching techniques. These gratings can be tuned thermally over a wide wavelength range. Achievement of polarization insensitivity is highlighted.
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