A lattice-form optical interleaver was designed and fabricated with a silicon-based silica waveguide. Cascaded multimode interference couplers were first employed in the lattice circuit and helped to relax the fabrication tolerance. The device shows good performance, the insertion loss is less than
, the passband ripple is less than
, the cross talk is less than
, and the
passband is more than
© 2007 Optical Society of America
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