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Design and demonstration of direct UV-written small angle X couplers in silica-on-silicon for broadband operation

Faisal R.M.Adikan1, Corin B.E.Gawith1, Peter G.R.Smith1, Ian J.G.Sparrow2, Gregory D.Emmerson2, Christos Riziotis3, and Harith Ahmad4

1. Optoelectronics Research Centre, University of Southampton, U.K.
2. Stratophase Limited, Unit A7, The Premier Centre, Premier Way, Romsey, SO51 9DG Southampton, U.K.
3. Department of Telecommunications Science and Technology, University of Peloponnese, Karaiskaki Street, 22 100 Tripoli, Greece.
4. Department of Physics, University of Malaya, 50603 Kuala Lumpur, Malaysia


Experimental demonstration of small angle (0.8-5) 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.

Applied Optics (2006) Vol.45(24) pp.6113-6118

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Copyright University of Southampton 2006