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Efficient fibre to X-cut Ti:LiNbO3 waveguide coupling for λ = 1.32 μm

Efficient fibre to X-cut Ti:LiNbO3 waveguide coupling for λ = 1.32 μm

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© The Institution of Electrical Engineers
Published

While efficient fibre-waveguide coupling has been achieved for titanium-diffused waveguides on Z-cut Y-propagating lithium niobate crystals, previously reported results for coupling to waveguides on non-Z-cut crystals have been poor. Here we report total fibre-waveguide-fibre insertion losses as low as −1.35 dB for ∼l.5 cm-long waveguides on X-cut Y-propagating lithium niobate—the preferable orientation for polarisation conversion devices. The losses are only slightly higher than the best value for Z-cut crystals (∼ −1 dB) due to the larger waveguide mode eccentricity.

Inspec keywords: optical waveguides; integrated optics; lithium compounds; optical couplers; titanium; optical fibres

Other keywords: polarisation conversion devices; integrated optics; X-cut; fibre-waveguide coupling; optical fibres; LiNMbO3:Ti; low insertion low; Y-propagating crystal

Subjects: Integrated optics; Fibre optics; Fibre optics and fibre waveguides; Optical waveguides and couplers; Integrated optics

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