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Proceedings Paper

Long-period gratings in polymer ridge waveguides
Author(s): Qing Liu; Kin Seng Chiang; Kar Pong Lor
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Paper Abstract

In this paper, we report the design and fabrication of a long-period waveguide grating (LPWG) in a polymer ridge waveguide, which has a benzocyclobutene (BCB) core and an epoxy cladding of the same width. We first apply an accurate perturbation theory to evaluate the phase-matching condition of the grating and derive simple analytical expressions to highlight the temperature dependence of the resonance wavelength. The possibility of achieving a polarization-independent resonance wavelength is also discussed. We next describe the fabrication of an LPWG in a BCB/epoxy ridge waveguide by a UV-writing technique using a KrF excimer laser and present the transmission spectra of the grating measured at different UV dosages. By controlling the waveguide width, we produce an LPWG with a resonance wavelength that is polarization insensitive at a specific temperature. The temperature dependence of the LPWG is also discussed. Our results provide a better understanding of the operation principle of LPWGs, which should facilitate the design of LPWG-based devices for various applications.

Paper Details

Date Published: 17 January 2005
PDF: 10 pages
Proc. SPIE 5644, Optoelectronic Devices and Integration, (17 January 2005); doi: 10.1117/12.569422
Show Author Affiliations
Qing Liu, City Univ. of Hong Kong (Hong Kong China)
Kin Seng Chiang, City Univ. of Hong Kong (Hong Kong China)
Kar Pong Lor, City Univ. of Hong Kong (Hong Kong China)

Published in SPIE Proceedings Vol. 5644:
Optoelectronic Devices and Integration
Hai Ming; Xuping Zhang; Maggie Yihong Chen, Editor(s)

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