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Proceedings Paper

Novel polarization selector based on an active waveguide photonic bandgap structure
Author(s): Christopher N. Morgan; Mark Silver; Kevin A. Williams; Antonios Atlasis; Peter J. Bennett; Xin Zhao; Richard V. Penty; Ian H. White
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Paper Abstract

We describe a photonic bandgap polarization selector based on a photonic crystal placed at junction of two 90° intersecting waveguides to form an ultra-compact device. The photonic crystal consists of 7 layers of a triangular lattice with a radius to pitch ratio (r/a) of 0.24 and a lattice constant of 0.386μm. The PBG is orientated so that the light is incident and collected at 45° to the Γ-K crystallographic direction. Modeling of the PBG shows that TM polarized light is strongly reflected while TE light passes largely into the crystal. Measurements of the fibre-to-fibre transmitted power of the device for each polarization show that the TM collected power is ~6dB higher than the TE light for equal input polarization powers. Further evidence of the strong reflection of TM light comes from an equivalent sample without a 2-D lattice at the waveguide junction. In these samples, no TM light is detected at the output. Furthermore, by taking into account the TE and TM gains within the active waveguides, the TM to TE polarization selection of the PBG is estimated to be up to 22dB.

Paper Details

Date Published: 9 July 2004
PDF: 11 pages
Proc. SPIE 5360, Photonic Crystal Materials and Devices II, (9 July 2004); doi: 10.1117/12.530700
Show Author Affiliations
Christopher N. Morgan, Cambridge Univ. (United Kingdom)
Mark Silver, Cambridge Univ. (United Kingdom)
Kevin A. Williams, Cambridge Univ. (United Kingdom)
Antonios Atlasis, Cambridge Univ. (United Kingdom)
Peter J. Bennett, Cambridge Univ. (United Kingdom)
Xin Zhao, Cambridge Univ. (United Kingdom)
Richard V. Penty, Cambridge Univ. (United Kingdom)
Ian H. White, Cambridge Univ. (United Kingdom)


Published in SPIE Proceedings Vol. 5360:
Photonic Crystal Materials and Devices II
Ali Adibi; Axel Scherer; Shawn-Yu Lin, Editor(s)

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