Page 190 - Fiber Bragg Gratings
P. 190

4.7 Radiation mode couplers                                     167








































             Figure 4.19: (a) shows the longitudinal integral and (b) is the transverse
             integral for different blaze angles.


             and E 0(p) is the field distribution of the fundamental mode. The integrals
             7 0 and I m are defined as








                 In Eq. (4.7.20), we remind ourselves that 7 is the transverse grating
             momentum that allows the mode to couple out of the core and is a function
             of the grating period as well as the blaze angle,
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