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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 41, Iss. 1 — Jan. 1, 2002
  • pp: 74–77

Polarization Dependence in Ti-Diffused LiNbO3 Directional Couplers

Donghua Gu, Ohannes Eknoyan, and Henry F. Taylor  »View Author Affiliations


Applied Optics, Vol. 41, Issue 1, pp. 74-77 (2002)
http://dx.doi.org/10.1364/AO.41.000074


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Abstract

The effect of design and fabrication parameters on the dependence on polarization of the splitting ratio in directional couplers produced by Ti diffusion in LiNbO<sub>3</sub> has been investigated experimentally at a wavelength of 1.54 μm. The parametric study was carried out at a diffusion temperature of 1025 °C, which was found to suppress outdiffusion effects. The directional couplers were produced by use of various combinations of waveguide separation, Ti film thickness, and diffusion time. Of particular interest was the identification of parameter sets for which the sum of TE and TM splitting ratios equals unity, as required for electro-optic and acousto-optic tunable filter designs with relaxed beam-splitter requirements. Directional couplers that closely match this criterion were obtained by diffusion of 3.5-mm-long, 7-μm-wide Ti strips separated by 11 μm for 11 h. It was found that a bending angle of 0.6° for input and output waveguides produces lower transmission loss for both polarizations than a 1.0° bend angle (>1-dB loss reduction).

© 2002 Optical Society of America

OCIS Codes
(130.0130) Integrated optics : Integrated optics
(130.3120) Integrated optics : Integrated optics devices
(130.3730) Integrated optics : Lithium niobate
(230.1360) Optical devices : Beam splitters

Citation
Donghua Gu, Ohannes Eknoyan, and Henry F. Taylor, "Polarization Dependence in Ti-Diffused LiNbO3 Directional Couplers," Appl. Opt. 41, 74-77 (2002)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-41-1-74


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References

  1. R. A. Steinberg and T. G. Giallorenzi, “Performance limitations imposed on optical waveguide switches and modulators by polarization,” Appl. Opt. 15, 2440–2453 (1976).
  2. R. C. Alferness, R. V. Schmidt, and E. H. Turner, “Characteristics of Ti-diffused lithium niobate optical directional couplers,” Appl. Opt. 18, 4012–4016 (1979).
  3. R. C. Alferness and L. H. Buhl, “Polarization independent optical filter using interwaveguide TE ↔ TM conversion,” Appl. Phys. Lett. 39, 131–134 (1981).
  4. A. Neyer, “Low-crosstalk passive polarization splitters using Ti:LiNbO3 waveguide crossings,” Appl. Phys. Lett. 55, 927–929 (1989).
  5. F. Wehrmann, C. Harizi, H. Herrmann, U. Rust, W. Sohler, and S. Westonhofer, “Integrated optical, wavelength selective, acoustically tunable 2 × 2 switches (add–drop multiplexers) in LiNbO3,” IEEE J. Sel. Top. Quantum Electron. 2, 263–269 (1996).
  6. T. Pohlmann, A. Neyer, and E. Voges, “Polarization independent Ti:LiNbO3 switches and filters,” IEEE J. Quantum Electron. 27, 602–607 (1991).
  7. J. E. Baran and D. A. Smith, “Adiabatic 2 × 2 polarization splitter on LiNbO3,” IEEE Photon. Technol. Lett. 4, 39–40 (1992).
  8. W. Warzanskyi, F. Hesimann, and R. C. Alferness, “Polarization-independent electrooptically tunable narrow-band wavelength filter,” Appl. Phys. Lett. 53, 13–15 (1998).
  9. N. Kuzuta and K. Takakura, “Polarisation insensitive LiNbO3 optical devices with power splitting and switching functions,” Electron. Lett. 27, 157–158 (1991).
  10. H. F. Taylor and O. Eknoyan, “Guided wave acousto-optic and electro-optic tunable filter designs with relaxed beam-splitter requirements,” Appl. Opt. 39, 124–128 (2000).

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