Bragg grating fabrication with wide range coarse and fine wavelength control

A Bragg grating fabrication method based on a phase-controlled interferometric approach with both coarse control and fine tuning of Bragg wavelength in the range of 1200-2200 nm is demonstrated by fabricating multiple Bragg reflectors in a single fiber device. With the fine tuning method, we achieved ~113 nm of FWHM bandwidth centered at ~1545 nm and ~174 nm of FWHM bandwidth centered at ~2005 nm, which were limited only by the size of the overlap of the interfering beams and by the Bragg wavelength. We used the wide range of the coarse wavelength control and the precision of the fine wavelength setting to determine the fiber Sellmeier coefficients with a mean squared error <3.5 × 10(-9).