Integrated Optics

Ultraviolet writing of buried waveguide devices in epoxy-coated benzocyclobutene

[+] Author Affiliations
Kar P. Lor

City University of Hong Kong,Department of Electronic Engineering, 83 Tat Chee Avenue, Hong Kong, China

Kin S. Chiang

City University of Hong Kong,Department of Electronic Engineering, 83 Tat Chee Avenue, Hong Kong, China

Qing Liu

City University of Hong Kong,Department of Electronic Engineering, 83 Tat Chee Avenue, Hong Kong, China

Hau P. Chan

City University of Hong Kong,Department of Electronic Engineering, 83 Tat Chee Avenue, Hong Kong, China

Opt. Eng. 48(4), 044601 (April 22, 2009). doi:10.1117/1.3122023
History: Received November 18, 2008; Revised February 21, 2009; Accepted February 26, 2009; Published April 22, 2009
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We propose a simple ultraviolet (UV) writing technique for the fabrication of buried waveguide devices, which employs a UV lamp as the light source and commercial benzocyclobutene (BCB) and epoxy OPTOCAST 3505 as the core and cladding materials, respectively. We show that the light emitted from the UV lamp can induce a large refractive-index change (up to 0.012) in BCB, while a negligible index change in the epoxy, which makes possible the writing of buried waveguide devices in BCB by exposing an epoxy-clad BCB film to the UV light through a mask. We demonstrate this technique experimentally with straight channel waveguides, Y-junction waveguide branches, and long-period waveguide gratings. The propagation loss of a typical fabricated waveguide is 1.6dBcm at 1550nm and the polarization-dependent loss is 0.4dBcm.

Figures in this Article
© 2009 Society of Photo-Optical Instrumentation Engineers

Citation

Kar P. Lor ; Kin S. Chiang ; Qing Liu and Hau P. Chan
"Ultraviolet writing of buried waveguide devices in epoxy-coated benzocyclobutene", Opt. Eng. 48(4), 044601 (April 22, 2009). ; http://dx.doi.org/10.1117/1.3122023


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