Adikan, F.R.M., Gawith, C.B.E., Smith, P.G.R., Sparrow, I.J.G., Emmerson, G.D., Riziotis, C. and Ahmad, H.
Design and demonstration of direct UV-written small angle X couplers in silica-on-silicon for broadband operation
Applied Optics, 45, (24), .
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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.
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