Tapered rib waveguides

Details Tapered rib waveguides Tapered rib waveguides

1990-11-06

1992-01-07

Lee, John D.

Optical waveguides

Planar optical waveguide

385 14, 385 43, G02B 612

Patent

active

050785168

ABSTRACT:
A tapered single-mode rib waveguide for which only laterally patterning is required. A sublayer is disposed between the low-index substrate and the high-index rib and has an intermediate index. Preferably a thin buffer layer of very low refractive index is disposed between the rib and the sublayer. The widths of the rib are chosen so that in a wide portion the optical power of the single-mode is concentrated in the rib or buffer layer but in a narrow portion the optical power is concentrated in the sublayer or substrate and additionally has a wide lateral distribution. A similar effect can be obtained by tapering an upper rib disposed on top of an untapered lower rib.

REFERENCES:
patent: 4679892 (1987-07-01), Haisma et al.
patent: 4773720 (1988-09-01), Hammer
patent: 4991926 (1991-02-01), Pavlath
Y. Shani et al., "Efficient Coupling of a Semiconductor Laser to an Optical Fiber by Means of a Tapered Waveguide on Silicon", Applied Physics Letters, 1989, vol. 55, pp. 2389-2391.

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