An Improved Theoretical Approach to Study Electromagnetic Waves through Fiber Bragg Gratings

Figure 2

The transmission coefficient as a function of the detuning frequency, evaluated with (27) and the Mathieu functions, for different values of the modulation amplitude and the same parameter values used in Figure 1. The behavior compares quite well with Figure 1; however the phase time using a code like Mathematica diverges for BG length above .