Design and demonstration of direct UV-written small angle X couplers in silica-on-silicon for broadband operation
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Published on: July 18, 2015
Faisal R M Adikan1, Corin B E Gawith, Peter G R Smith
1Optoelectronics Research Centre, University of Southampton, SO17 1BJ Southampton, UK. mfra@orc.soton.ac.uk
Abstract:
Experimental demonstration of small angle (0.8 degrees-5 degrees ) direct UV-written X couplers in silica-on-silicon is presented. Maximum and minimum coupling ratios of 95%(+/-0.8%) and 1.9% (+/-1%), respectively, were recorded. The structures also display very low polarization and wavelength dependence. A typical excess loss of 1.0 dB(+/-0.5 dB) was recorded. Device modeling using the beam propagation method and an analytical model showed good agreement with experimental results over a broad crossing angle and wavelength range.
