
11.5 PASSIVE WAVEGUIDE DEVIC ES
AND RESONATORS
11.5.1 Splitters and Couplers
As noted earlier, the high index contrast and low bending loss available in the SOI
system suggests that optical components can be significantly miniaturized com-
pared with more common integrated optic materials systems. Examples of passive
devices, and thermo-optic active devices, that have been demonstrated include the
full suite of splitters, directional and multimode interference (MMI) couplers,
thermo-optic switches based on these components, and for wavelengt h division
multiplexing (WDM) functi ons, arrayed waveguide grating filters, grating-based
filters and add–drops, ...