Low-Loss Ti:LiNbO3 Waveguide Bends at λ = 1.3 μm

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.

[1]  R. Alferness,et al.  Mode size and method for estimating the propagation constant of single-mode Ti:LiNbO 3 strip waveguides , 1982 .

[2]  D Marcuse,et al.  Length optimization of an S-shaped transition between offset optical waveguides. , 1978, Applied optics.

[3]  I. Kaminow,et al.  Metal‐diffused optical waveguides in LiNbO3 , 1974 .

[4]  H F Taylor,et al.  Losses at corner bends in dielectric waveguides. , 1977, Applied optics.

[5]  I. A. White,et al.  Radiation from bends in optical waveguides: the volume-current method , 1979 .

[6]  E. A. J. Marcatili,et al.  Improved relations describing directional control in electromagnetic wave guidance , 1969 .

[7]  Moty Heiblum,et al.  Analysis of curved optical waveguides by conformal transformation , 1975 .

[8]  M. Taylor,et al.  Measured losses in LiNbO(3) waveguide bends. , 1980, Applied optics.

[9]  H F Taylor,et al.  Power loss at directional change in dielectric waveguides. , 1974, Applied optics.

[10]  W. Burns,et al.  Modes in diffused optical waveguides of arbitrary index profile , 1975 .

[11]  R C Alferness,et al.  Electro-optic waveguide TE <--> TM mode converter with low drive voltage. , 1980, Optics letters.

[12]  H Kogelnik,et al.  Scaling rules for thin-film optical waveguides. , 1974, Applied optics.

[13]  F. J. Leonberger,et al.  Low-loss LiNbO(3)waveguide bends with coherent coupling. , 1983 .

[14]  L D Hutcheson,et al.  Comparison of bending losses in integrated optical circuits. , 1980, Optics letters.

[15]  W. Burns,et al.  Mode dispersion in diffused channel waveguides by the effective index method. , 1977, Applied optics.