Optical filter with very large stopband (approximately 300 nm) based on a photonic-crystal vertical-directional coupler.
We have designed, fabricated, and demonstrated a vertical directional coupler based on the coupling between a polymer waveguide and a W1 photonic crystal waveguide. The filters have a bandwidth of approximately 2 nm within a stopband of Delta lambda approximately 300 nm and an on-chip insertion loss of 1 dB. This is the first (to our knowledge) demonstration of a filter with such a large stopband that overcomes the bandwidth limitation of existing filters.
Grande
M
M
School of Physics and Astronomy, University of St Andrews, St Andrews, Fife, KY169SS, UK. grande@deemail.poliba.it
O'Faolain
L
L
White
T P
TP
Spurny
M
M
D'Orazio
A
A
Krauss
T F
TF