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Proceedings Paper

Cross talk reduction in switching networks by asymmetrical off-on switches
Author(s): Winfried Bernhard; Roland Mueller-Fiedler; Thomas Pertsch; Christoph A. Waechter
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Paper Abstract

A new off-on switching scheme is introduced which blocks a waveguide path in the passive off-state and transmits the signal in the active on-state. The operating principle is based on the self-diffraction of a narrow guided beam when it escapes from a waveguide with two dimensional confinement into a region of appropriate length with at most one dimensional confinement. In particular a remaining interface of the initial waveguide superimposes reflection, which in sum results in a very efficient asymmetrical blow out of the guided power. In the active on-state, low-loss waveguiding is sustained when an electrode causes an appropriate refractive index change, e.g. due to the thermo-optical effect. Thus the signal is received in the output waveguide, an identical pendant of the input guide. The switching behavior is almost digital, and the wavelength dependence is minimal only. This makes the device useful for switching and modulation in a multi-wavelength optical network. Calculations show on-off signal ratios of better than 30 dB e.g. in polymeric waveguide configuration of 3 mm length. This is nicely adapted to the demands of crosstalk reduction in switching networks. Experimental results from a thermo-optic polymer waveguide device with 32 dB off-state attenuation and 0.8 dB on-state excess loss fit well to the data obtained from the numerical modeling.

Paper Details

Date Published: 26 March 1999
PDF: 9 pages
Proc. SPIE 3620, Integrated Optics Devices III, (26 March 1999); doi: 10.1117/12.343744
Show Author Affiliations
Winfried Bernhard, Robert Bosch GmbH (Germany)
Roland Mueller-Fiedler, Robert Bosch GmbH (Germany)
Thomas Pertsch, Fraunhofer-Institut fuer Angewandte Optik und Feinmechanik (Germany)
Christoph A. Waechter, Fraunhofer-Institut fuer Angewandte Optik und Feinmechanik (Germany)

Published in SPIE Proceedings Vol. 3620:
Integrated Optics Devices III
Giancarlo C. Righini; S. Iraj Najafi, Editor(s)

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