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Demonstration of mode conversion using anti-symmetric waveguide Bragg gratings

Jose M. Castro, David F. Geraghty, Seppo Honkanen, Christoph M. Greiner, Dmitri Iazikov, and Thomas W. Mossberg

Open Access Open Access

Abstract

We experimentally demonstrate a novel grating which only produces reflection with mode conversion in a two-mode waveguide. That characteristic can improve the performance of optical devices that currently use tilted Bragg gratings to provide the mode conversion. Tilted Bragg gratings produce also reflections without mode conversion which increases noise and crosstalk of the optical device.

©2005 Optical Society of America

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Figures (6)
Fig. 1.
Fig. 1. Schematics of the anti-symmetric waveguide grating (a) and a waveguide with a tilted Bragg grating (b).

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Fig. 2.
Fig. 2. Comparison of a TBG (dashed line) to the anti-symmetric Bragg Grating (solid line).

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Fig. 3.
Fig. 3. Schematics of the fabricated device using the anti-symmetric grating. Measured mode profiles of the two-mode waveguide are also shown.

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Fig. 4.
Fig. 4. Set up for sample characterization.

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Fig. 5.
Fig. 5. Calculated and measured TE reflection spectrum of the anti-symmetric waveguide Bragg grating.

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Fig. 6.
Fig. 6. Calculated and measured TM reflection spectrum of the anti-symmetric waveguide Bragg grating.

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Equations (2)

Equations on this page are rendered with MathJax. Learn more.

η ab = ∬ e a * ( x , y ) ζ ( x , y ) e b ( x , y ) dxdy ∬ e a * ( x , y ) e a ( x , y ) dxdy ∬ e b * ( x , y ) e b ( x , y ) dxdy
λ oe = Λ ( n e + n o )
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