Phase-modulation method for AWG phase-error measurement in the frequency domain.
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.
Takada
Kazumasa
K
Department of Electronic Engineering, Faculty of Engineering, Gunma University, 1-5-1 Tenjin-cho,Kiryu 376-8515, Japan. takada@el.gunma-u.ac.jp
Hirose
Tomohiro
T