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(a) Schematic view of an optical power splitter with 90° bends. The radii of curvature are held constant while the photonic wire widths are varied. Both output branches are shifted from the input branch. (b) SEM image of a splitter with and . (c) Magnified view of the 90° bend.
(Color online) Simultaneously taken vidicon camera images and hereof calculated optical power distributions of both output branches (solid lines). The power distributions show an excellent agreement with the fitted gaussian curves (dotted lines). Almost identical maximum values and standard deviations are obtained.
(a) Schematic view of the cascadelike T-splitter device. It generates six output branches with an ascending number of divisions. (b) Crosssection of the transmitted optical power at a wavelength of ( and ). The inset shows the maximum power of each branch in a semilogarithmic scale with a slope of , which yields to an excess loss of per splitter.
Light intensity of one output branch of a T-splitter ( and ) over a wavelength of . The shown intensity is normalized against the incident light.
(Color online) Fraction of incident light intensity per output branch after T-splitter and 90° bend. The measured optical powers (solid circles, and ) are confirmed by theoretical 3D-FDTD calculations (open circles). The inset shows the calculated -field distribution at the splitter using a continuous excitation of the electromagnetic field. Also scattering losses due to the compact splitting are recognizable.
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