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Silicon-wire-based ultrasmall lattice filters with wide free spectral ranges

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Abstract

Using silicon-on-insulator-based silicon-wire waveguides with submicrometer cross sections, we constructed ultrasmall channel-dropping lattice filters for 1.5µm infrared systems. The waveguide’s low-loss bends with 2.5µm radius reduce the total length of the filter to less than 100 µm and enlarge the free spectral range to more than 80 nm. The measured spectra show fine channel-dropping characteristics, and the results agree well with numerical predictions. Moreover, we have succeeded in tuning the dropping wavelength by adjusting the lengths of the delay lines.

© 2003 Optical Society of America

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