We present an analysis on the visible diffraction patterns of Tilted Fiber Bragg Gratings (TFBG), with applications to blue-laser fiber sensors. On the basis of our current understanding of a visible diffraction phenomenon called sidetapping, or outtapping, we compare theoretical predictions with experimental results.
In order to compare theory to experiment we obtain empirical observations of diffraction angles. A 1550nm-TFBG is connected to a Coherent Spectrum-70C laser source and measurements are taken for several wavelengths including red (647.1nm), yellow (568.2nm), green (514.5nm),
blue (488.0nm) and violet (457.9nm) to show that our results are in definite agreement with theory. There are other variables that affect and govern this diffraction behaviour so a comprehensive parameter study is used to relate the input variables to output variables. Output variables are power and longitudinal angles of each radiating diffraction order.