Adiabaticity criterion and the shortest adiabatic mode transformer in a coupled-waveguide system

By analyzing the propagating behavior of the supermodes in a coupled-waveguide system, we have derived a universal criterion for designing adiabatic mode transformers. The criterion relates epsilon, the fraction of power scattered into the unwanted mode, to waveguide design parameters and gives the...

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Bibliographic Details
Published in:Optics letters 2009-02, Vol.34 (3), p.280-282
Main Authors: XIANKAI SUN, LIU, Hsi-Chun, YARIV, Amnon
Format: Article
Language:English
Subjects:
Applied sciences
Circuit properties
Electric, optical and optoelectronic circuits
Electronics
Exact sciences and technology
Fundamental areas of phenomenology (including applications)
Integrated optics. Optical fibers and wave guides
Optical and optoelectronic circuits
Optical elements, devices, and systems
Optical waveguides and coupleurs
Optics
Physics
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Summary:By analyzing the propagating behavior of the supermodes in a coupled-waveguide system, we have derived a universal criterion for designing adiabatic mode transformers. The criterion relates epsilon, the fraction of power scattered into the unwanted mode, to waveguide design parameters and gives the shortest possible length of an adiabatic mode transformer, which is approximately 2/piepsilon1/2 times the distance of maximal power transfer between the waveguides. The results from numerical calculations based on a transfer-matrix formalism support this theory very well.
ISSN:0146-9592
1539-4794
DOI:10.1364/ol.34.000280