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Optica Publishing Group
  • Conference on Optical Fiber Communication/International Conference on Integrated Optics and Optical Fiber Communication
  • 1993 OSA Technical Digest Series (Optica Publishing Group, 1993),
  • paper FB2
  • https://doi.org/10.1364/OFC.1993.FB2

Tunable guided-wave optical polarization converters using static strain-induced mode coupling in lithium tantalate

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Abstract

Guided-wave optical polarization converters in birefringent crystals are wavelength selective and are thus useful for wavelength-division-multiplexing applications. Several such components have been produced on LiNbO3 and LiTaO3 substrates by using electro-optic or acousto-optic interactions.1–3 Their operation, however, has required a continuous use of external power to sustain the polarization coupling. This paper reports the use of static shear strain to promote polarization conversion in a channel waveguide. The strain is produced by a spatially periodic surface film deposited at an elevated temperature and patterned at room temperature; it is induced from the thermal expansion mismatch between film and substrate. No external power drive is needed, and the conversion is highly wavelength selective. Both thermal and electro-optic tuning have been used to shift the wavelength of maximum conversion.

© 1993 Optical Society of America

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