A digital upsampling method for measuring arrayed waveguide grating (AWG) phase error in the frequency domain is reported. This technique enabled measurement of phase error with variations of ≤3.2×10−3 rad even when an 80 cm-long delay line is added to one arm of the interferometer.
Inspec keywords: arrayed waveguide gratings; signal sampling; light interferometry; frequency-domain analysis; optical testing; Hilbert transforms; optical information processing; optical delay lines
Other keywords:
Subjects: Integral transforms; Optical, image and video signal processing; Optical testing techniques; Optical interferometry; Optical waveguides and couplers; Function theory, analysis; Gratings, echelles; Other optical system components; Optical waveguides
References
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