Two Coupling Methods For Plane Symmetrical Dielectric Waveguides

F. Lanzl; O. Meyer; D. Rathjen

doi:10.1117/12.955308

10 April 1977 Two Coupling Methods For Plane Symmetrical Dielectric Waveguides

F. Lanzl, O. Meyer, D. Rathjen

Proceedings Volume 0099, 3rd European Electro-Optics Conf; (1977) https://doi.org/10.1117/12.955308
Event: Third European Electro-Optics Conference, 1976, Geneva, Switzerland

Abstract

Theoretically and experimentally, we investigated two methods for the excitation of single modes in plane symmetrical multimode waveguides. I. The first method performs coupling through the polished front face of the guide. For this an astigmatic system generates a focal line a short distance in front of the front face and parallel to it. Part of the divergent light proceeding from the focal line couples into the guide. Mode selection is achieved by simple translation of the guide. Typical values of the coupling efficiency are about 10%. A disadvantage of this method is that modes cannot be excited purely. II. In the second method coupling into the symmetrical waveguide is achieved by shining light through a cladding onto a sinusoidal metallic grating at the opposite film-cladding interface. Coupling in the first order of reflection is accomplished by the grating. Mode selection is done by rotating the system. The dependence of the coupling efficiency on the grating height was investigated. Maximum efficiency is about 30% with very good mode-purity. This method is more advantageous compared to the first. Aside from high efficiency and mode-purity it is particularly the good handling and the protection of the coupler inside the system, which makes this method recommendable.

Citation Download Citation

F. Lanzl, O. Meyer, and D. Rathjen "Two Coupling Methods For Plane Symmetrical Dielectric Waveguides", Proc. SPIE 0099, 3rd European Electro-Optics Conf, (10 April 1977); https://doi.org/10.1117/12.955308

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