Abstract
Three different grating tilting formulas for predicting the optimum
grating tilt angle for strong mode coupling in planar waveguide
gratings are derived. The optimum tilt angles obtained by the
ray-optics approach deviate ∼1° for transmissive mode coupling and
∼1.5° for reflective mode coupling from those computed by the
coupled-mode approach. The coupled-mode analysis and ray-optics
analysis of the tilted planar waveguide gratings show that the
transmissive planar waveguide gratings should be tilted more than 84°
for strong TE0-to-TEμ mode coupling near 1550
nm.
© 2000 Optical Society of America
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