Loss characteristics of asymmetry and symmetry curved optical waveguide

Devayani, Indah Juningtiaz (2014) Loss characteristics of asymmetry and symmetry curved optical waveguide. Diploma thesis, Universitas Al Azhar Indonesia.

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Abstract

Bending waveguide is used to connect two separated optical waveguides. But the bend will produce a high loss. The bending loss can be reduced by designing the geometry structure, and value of effective refractive index for the core and cladding. In this final project, we will compute the bend loss between two slabs waveguide structure, asymmetry and symmetry. In asymmetry, we only calculate the curved loss and compare it with the curved loss at symmetry slab waveguide in the same parameters. Then, we calculate the S-shaped bend geometry structures at symmetry slab waveguide; back-to-back and sinusoidal bends. From the simulation result, we can obtain that the bend loss depends on the value of ?n, and geometry structure of bend in slab waveguide. The bend loss decrease when ?n is increased. The comparisons result of curved loss at asymmetry is lower than symmetry slab waveguide structure, because there is a difference at the refractive index cladding (n3). To get the lower curved loss we use the minimum curvature (r) > 3mm for asymmetry, and (r) > 4mm for symmetry slab waveguide. Then, the bend loss back-to-back is higher than sinusoidal bend at the same parameters. It may caused of the sinusoidal bend geometry structure is more smooth than back-to-back because the bend on sinusoidal S-shaped bend is a function of transition length. The bend loss will occur at the range transition length (L) is 1-3.8mm for back-to-back, and (L) is 1-1.6mm at sinusoidal bend.

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