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Design of arrayed-waveguide gratings using hybrid Fourier-Fresnel transform techniques

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2 Author(s)
Parker, M.C. ; Fujitsu Telecommun. Europe Ltd., Colchester, UK ; Walker, S.D.

We describe how transform techniques may be applied to the design of arrayed-waveguide gratings (AWG's). A hybrid Fourier-Fresnel transform model indicates that a flat AWG router passband over 30% of the device free-spectral range (FSR) is feasible. Minimized passband ripple is achieved by applying a subparabolic phase-profile (phase-exponent P=1.82) to the Fourier plane of the AWG. Simulations of a complex-apodized AWG with passband 3 dB width increased from 1 to 12 nm, with a near-trapezoidal amplitude response, and band-edge group delay of 70 ps reduced to 10 ps are presented for a device with a FSR of 40 nm

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Selected Topics in Quantum Electronics, IEEE Journal of  (Volume:5 ,  Issue: 5 )