||M. Gerken and D. A. B. Miller,
"Thin-Film (DE)MUX based on group-velocity effects,"
European Conference on Optical Communication 2002, Copenhagen, Denmark
(September 8-12, 2002). Paper 11.3.3.
demonstrate that group-velocity effects in a single 66-layer
dielectric stack can be used to separate four channels by spatial beam
shifting. A nearly linear 100 micron shift is experimentally achieved
between 827 and 841 nm.
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