Performance of S-bends for integrated-optic waveguides
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The performance of S-bends, which are used for connecting waveguides offset with respect to each other, is very important in integrated-optic waveguide circuits. Several approaches for the design of S-bends have been reported in the literature. These include, in particular, designs based on simple sinusoidal curves as well as relatively complicated, but more general, polynomial curves. This paper reports a comparison of the calculated pure bend loss of such S-bends for a typical silica-based waveguide operating at a wavelength of 1550 nm. It is shown that the simple cosine S-bands yield a performance which is close to that obtained from the general polynomial curve-based S-bends. Design curves are also presented for these two types of S-bends. The calculations are based on the analytical expression for bend loss proposed by Marcuse. © 1998 John Wiley & Sons, Inc. Microwave Opt Technol Lett 19: 289–292, 1998.