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The coupling of optical power between a fibre, side polished close to the core, and a planar multimode waveguide overlay is highly wavelength selective. Vacuum deposited films and polished lithium niobate have been used in the role of the overlay and a wavelength resolution of 3 nm (with subnanometre feasibility) has been demonstrated with losses of less than 0.2 dB. Electro-optic tunability in the...
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