Point-by-point inscription of apodized fiber Bragg gratings
  We demonstrate apodized fiber Bragg gratings inscribed with a point-by-point technique. We tailor the grating phase and coupling amplitude through precise control over the longitudinal and transverse position of each laser-inscribed modification. This method of apodization is facilitated by the highly-localized, high-contrast modifications generated by focussed IR femtosecond laser inscription. Our technique provides a simple method for the design and implementation of point-by-point fiber Bragg gratings with complex apodization profiles. 
Robert J. Williams, Christian Voigtl\"ander, Graham D. Marshall,   Andreas T\"unnermann, Stefan Nolte, M. J. Steel, Michael ...
physics.optics