Abstract

Measurements on the reflectance R of a guided-beam splitter have been performed. The fabrication method, based on the use of a thin wire as a mask, produces a groove with a parabolic thickness profile in a planar waveguide. The experimental results demonstrate that the theoretical expression R = tanh2δ describes well the observed phenomena, especially when the TM0 mode is incident on the groove. Additional applications of this device for polarization analysis and mode selection are also discussed.

© 1980 Optical Society of America

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