Dresden 2011 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 43: Laseranwendungen und Photonik 2
Q 43.4: Talk
Wednesday, March 16, 2011, 17:15–17:30, SCH A118
Tunable thin film Fabry-Pérot filters directly coated on the end-faces of optical fibers — •Dawid Schweda1, Stefan Meister1, Marcus Dziedzina1, Ronny Juhre1, Stefan Prorok2, Manfred Eich2, and Hans J. Eichler1 — 1Technische Universität Berlin, Institut für Optik und Atomare Physik, Berlin, Germany — 2Technische Universität Hamburg-Harburg, Hamburg, Germany
Thin film Fabry-Pérot filters which act as narrow bandpass filters were directly coated on fiber end-faces to achieve a very high level of integration with a reduction of optical elements. Possible fields of application are sensing, monitoring and telecommunication. The Fabry-Pérot filters were realized as thin film dielectric Bragg mirrors in combination with an electro-optical (eo) polymer as the spacer material. Filter bandwidths of less than 1nm were achieved resulting in a Q-factor of more than 2200. With additionally integrated films of transparent conductive oxides used as electrodes, e.g. indium tin oxide (ITO), the filters become tunable. The initially poled and therefore anisotropic eo-polymer spacer performs a Pockels effect during the application of an electrical field, which leads to a change in the refractive index of the spacer. Low drive voltages of several volts, in dependency of the poling efficiency and the applicable field strength, already lead to a shift of the transmitted wavelength in the nanometer range. While in general any filter band can be achieved by the adjustment of the design parameters, focus have been taken on the telecommunication wavelength of 1550nm.