Interferometric method for phase error measurement in an arrayed waveguide grating with a free space output

@article{Zektzer2012InterferometricMF,
  title={Interferometric method for phase error measurement in an arrayed waveguide grating with a free space output},
  author={R. T. Zektzer and David Sinefeld and Noam Goldshtein and D. M. Marom},
  journal={OFC/NFOEC},
  year={2012},
  pages={1-3}
}
We demonstrate a simple phase error measurement technique for AWG that radiate to free-space. The pair-wise far-field interference pattern of adjacent waveguides is used to measure the relative phase shift, with 13mrad accuracy.