title: Phase-modulation method for AWG phase-error measurement in the frequency domain.
abstract: We report a phase-modulation method for measuring arrayed waveguide grating (AWG) phase error in the frequency domain. By combining the method with a digital sampling technique that we have already reported, we can measure the phase error within an accuracy of +/-0.055 rad for the center 90% waveguides in the array even when no carrier frequencies are generated in the beat signal from the interferometer.
authors.affiliation: Department of Electronic Engineering, Faculty of Engineering, Gunma University, 1-5-1 Tenjin-cho,Kiryu 376-8515, Japan. takada@el.gunma-u.ac.jp
authors.forename: Kazumasa
authors.initials: K
authors.lastname: Takada
authors.forename: Tomohiro
authors.initials: T
authors.lastname: Hirose