Using silicon-on-insulator-based silicon-wire waveguides with submicrometer cross sections, we constructed ultrasmall channel-dropping lattice filters for 1.5-μm infrared systems. The waveguide’s low-loss bends with 2.5-µm 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
(130.3060) Integrated optics : Infrared
(130.3120) Integrated optics : Integrated optics devices
(230.3990) Optical devices : Micro-optical devices
(230.7380) Optical devices : Waveguides, channeled
Koji Yamada, Tetsufumi Shoji, Tai Tsuchizawa, Toshifumi Watanabe, Jun-ichi Takahashi, and Sei-ichi Itabashi, "Silicon-wire-based ultrasmall lattice filters with wide free spectral ranges," Opt. Lett. 28, 1663-1664 (2003)