Page 190 - Fiber Bragg Gratings
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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,