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Low-loss Ti:LiNbO3waveguide bends at λ = 1.3 µm

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3 Author(s)
Minford, W.J. ; Lucent Technologies, Bell Laboratories, PA ; Korotky, S.K. ; Alferness, R.C.

Low-loss waveguide bends are necessary for many proposed integrated optical circuits. The bend loss associated with an S -shaped transition connecting offset 6 μm wide titanium-indiffused lithium niobate strip waveguides has been measured as a function of transition length and initial Ti metal thickness for 1.3 μm wavelength. Losses as low as 0.2 ± 0.2 dB have been achieved for a transition between offset parallel waveguides with a 0.1 mm lateral and 3.25 mm longitudinal separation. The bend loss is shown to be strongly dependent on the mode confinement and less sensitive to the shape of the transition curve.

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Quantum Electronics, IEEE Journal of  (Volume:18 ,  Issue: 10 )