Abstract
We demonstrate monolithically integrated four and eight-channel coarse-wavelength-division multiplexers with
low insertion loss (IL) and wide flat-top passbands based on integrated-holographic filters. Like thin-film filters
(TFFs), integrated-holographic filters function via a multipath interference and thus offer flexible passband
control without the IL penalty that passband shaping typically incurs in single-mode angularly dispersive devices.
Unlike TFF-based multiplexers, the multiplexers described here are based on the silica-on-silicon planar lightwave
circuit platform rather than discrete optics and thus uniquely provide powerful TFF-like filtering function in fully
integrated format. The multiplexer performance demonstrated is superior to the integrated solutions demonstrated to
date, and competitive with discrete TFF-based devices.
© 2007 IEEE
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