Patent
1986-09-08
1988-10-11
Lee, John
350 9617, G02B 610
Patent
active
047766557
ABSTRACT:
An optical waveguide device, suitable for coupling to optical fibers, provides a combination of narrow optical confinement and small changes in refractive index along a first axis, with broad optical confinement and large changes in refractive index along a second, perpendicular axis. A rib waveguide in which a single transverse mode beam can propagate, comprises a thin guiding layer 2 sandwiched between a pair of relatively thick confining layers 1, 3 of refractive index only slightly less than that of the guiding layer 2. The rib is etched through both the upper confining layer 3 and the guiding layer 2 and is exposed at its sides and top to air.
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Leonberger et al., "Low-Loss GaAs p+n-n+ Three-Dimensional Optical Waveguides", Applied Physics Letters, vol. 28, No. 10, May 1976, pp. 616-619.
Noda et al., "A Novel Optical Waveguide for Integrated Optics", 1973 IEEE OSA Conference on Laser Engineering and Applications, Digest of Technical Papers, May 1973.
Bell Systems Technical Journal, vol. 53, No. 4, Apr. 4, 1974; U.S.A. "Slab-coupled Waveguides" E. A. J. Marcatili.
Adams Michael J.
Robertson Michael J.
British Telecommunications
Lee John
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