Design of arrayed-waveguide gratings using hybrid Fourier-Fresneltransform techniques

摘要

We describe how transform techniques may be applied to the designnof arrayed-waveguide gratings (AWG's). A hybrid Fourier-Fresnelntransform model indicates that a flat AWG router passband over 30% ofnthe device free-spectral range (FSR) is feasible. Minimized passbandnripple is achieved by applying a subparabolic phase-profilen(phase-exponent P=1.82) to the Fourier plane of the AWG. Simulations ofna complex-apodized AWG with passband 3 dB width increased from 1 to 12nnm, with a near-trapezoidal amplitude response, and band-edge groupndelay of 70 ps reduced to 10 ps are presented for a device with a FSR ofn40 nm