Arrangement for converting an optical wave having a small spot w

Details Arrangement for converting an optical wave having a small spot w Arrangement for converting an optical wave having a small spot w

1991-12-13

1992-10-06

Ullah, Akm E.

Optical waveguides

With optical coupler

Particular coupling structure

G02B 636

Patent

active

051539357

ABSTRACT:
An arrangement for converting an optical wave having a small spot width into an optical wave having a larger spot width comprises a first integrated optical waveguide to which a semiconductor component may be coupled and is embedded in a second, larger optical waveguide to which a monomode fiber is to be coupled. The first optical waveguide preferably tapers as it extends into the second waveguide and ends at a distance from the end face of the second waveguide so that a first optical wave in the first waveguide will spread as a consequence of the first optical waveguide becoming thinner until the wave guidance is assumed by the second waveguide. The coupler enables coupling monomode fibers to optical semiconductor components without requiring microlenses for matching the various modes.

REFERENCES:
patent: 4669815 (1987-06-01), Thaniyavarn
patent: 4669816 (1987-06-01), Thompson
patent: 4796975 (1989-01-01), Lukas et al.
patent: 5062681 (1991-11-01), Furmanak et al.
Murakami et al, "A Very Narrow-Beam AlGaAs Laser with a Thin Tapered-Thickness Active Layer (T.sup.3 Laser)", IEEE Journal of Quantum Electronics, vol. QE-23, No. 6, Jun. 1987, pp. 712-719.
Shani et al, "Efficient Coupling of a Semiconductor Laser to an Optical Fiber by Means of a Tapered Waveguide on Silicon", Appl. Phys. Lett, vol. 55, No. 23, Dec. 4, 1989, pp. 2389-2391.
Deri et al, "Efficient Fiber Coupling to Low-Loss Diluted Multiple Quantum Well Optical Waveguides", Appl. Phys. Lett., vol. 55, No. 15, Oct. 9, 1989, pp. 1495-1497.
Koch et al, "Tapered Waveguide InGaAs/InGaAsP Multiple-Quantum-Well Laers", IEEE Photonics Technology Letters, vol. 2, No. 2, Feb. 1990, pp. 88-90.

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