Jbd. Soole et al., USE OF MULTIMODE INTERFERENCE COUPLERS TO BROADEN THE PASSBAND OF WAVELENGTH-DISPERSIVE INTEGRATED WDM FILTERS, IEEE photonics technology letters, 8(10), 1996, pp. 1340-1342
We describe how multimode interference couplers (MMI) may be used to b
roaden and flatten the passband of integrated wavelength-dispersive fi
lters. We discuss the approach and demonstrate ifs effectiveness with
a passband-broadened InP arrayed waveguide filter operating at 1.5 mu
m.