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Optics Letters

Optics Letters

| RAPID, SHORT PUBLICATIONS ON THE LATEST IN OPTICAL DISCOVERIES

  • Vol. 21, Iss. 11 — Jun. 1, 1996
  • pp: 794–796

Adiabatically tapered periodic segmentation of channel waveguides for mode-size transformation and fundamental mode excitation

M. H. Chou, M. A. Arbore, and M. M. Fejer  »View Author Affiliations


Optics Letters, Vol. 21, Issue 11, pp. 794-796 (1996)
http://dx.doi.org/10.1364/OL.21.000794


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Abstract

We report modeling, fabrication, and characterization of tapered waveguides, using periodically segmented annealed proton exchange in LiNbO3. For a taper transforming the 1/e full width (intensity) mode size from 6.0 μm × 4.4 μm to 2.0 μm × 1.3 μm, 0.4-dB excess loss was observed. The large, slightly elliptical mode can ease coupling to single-mode fibers and circular free-space beams. The same taper structure was used to excite a highly multimoded (13 modes) waveguide with more than 95% of the power stably launched into the lowest-order mode. This function is useful for nonlinear waveguide devices, such as difference-frequency generators, in which modes at highly disparate wavelengths interact.

© 1996 Optical Society of America

History
Original Manuscript: November 27, 1995
Published: June 1, 1996

Citation
M. H. Chou, M. A. Arbore, and M. M. Fejer, "Adiabatically tapered periodic segmentation of channel waveguides for mode-size transformation and fundamental mode excitation," Opt. Lett. 21, 794-796 (1996)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-21-11-794

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