Study of bend loss of curved optical waveguides is a fundamental subject in field of curved optical waveguides design
and fabrication. In order to decrease the bend loss of curved optical waveguides efficiently, a number of strategies are
proposed. In this paper, we give out a new strategy to reduce bend loss of curved optical waveguides by modifying its
cross section. The principle of this strategy was discussed and the simulations using beam propagation method was
given. This new method is useful and practical in design of curved optical waveguides. Especially, it is more effective in
situations that the radius of curvature of the waveguides and the refractive index of materials were set beforehand.
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