Split of phase shifts in a phase mask for fiber Bragg gratings

@article{Sheng2004SplitOP,
  title={Split of phase shifts in a phase mask for fiber Bragg gratings},
  author={Yi-Ming Sheng and J. E. Rothenberg and Hongpu Li and Ying Wang and Jason Zweiback},
  journal={IEEE Photonics Technology Letters},
  year={2004},
  volume={16},
  pages={1316-1318}
}
Using rigorous finite-difference in time-domain analysis for near field diffraction of a phase-shifted phase mask, we discover that the phase shift is not replicated in the fiber by side-writing through the mask, but is split into two half-magnitude phase shifts with a separation proportional to the fiber-to-phase mask spacing. We show by a physical model for cumulated phase that spectral asymmetry observed in a multichannel fiber Bragg grating (FBG) with a binary phase Dammann sampling… CONTINUE READING