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Proceedings Paper

Integrated optical cross strip interferometer
Author(s): Manfred Lohmeyer; Remco Stoffer; Ludger Wilkens; Horst Doetsch
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Paper Abstract

A thick, bimodal segment of specific length and height between two single mode sections of a planar waveguide can serve as an integrated optical interferometer. It is realized by etching a wide strip form a guiding film. A vertically guided, laterally unguided beam of light is then made to traverse the strip perpendicularly. For a wide range of materials the structure can be dimensioned such that it shows the proper behavior of an interferometer: depending on the phase gain of the two modes in the thick region, the guided light interferes either almost completely destructively at the transition to the output segment, i.e. the power is radiated away into the substrate and cover regions, or constructively, i.e. most of the power passes the device. We believe that for certain applications structures of this kind can be a simple substitute for instruments like Mach-Zehnder interferometers or directional couplers. This is illustrated by two numerically simulated examples: A polarizer constructed from silicon based waveguides, which offers 30 dB polarization discrimination and 0.1 dB insertion loss with a total length of only 10 micrometers, and a proposal for an integrated magneto optic isolator experiment, where the freedom in the lateral direction can be exploited for a proper tuning of the device.

Paper Details

Date Published: 15 May 2001
PDF: 12 pages
Proc. SPIE 4277, Integrated Optics Devices V, (15 May 2001); doi: 10.1117/12.426799
Show Author Affiliations
Manfred Lohmeyer, Univ. of Twente (Netherlands)
Remco Stoffer, Univ. of Twente (Netherlands)
Ludger Wilkens, Univ. of Osnabrueck (Germany)
Horst Doetsch, Univ. of Osnabrueck (Germany)

Published in SPIE Proceedings Vol. 4277:
Integrated Optics Devices V
Giancarlo C. Righini; Seppo Honkanen, Editor(s)

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