Achromatic input/output coupler for integrated optical circuits

Details Achromatic input/output coupler for integrated optical circuits Achromatic input/output coupler for integrated optical circuits

1990-11-08

1992-03-31

Gonzalez, Frank

Optical waveguides

With optical coupler

Input/output coupler

385 37, G02B 634

Patent

active

051014580

ABSTRACT:
In order to stabilize the coupling angle, at which light is coupled into and out of an optical waveguide of an integrated optical circuit or the like, with changes in wavelength of the light (to achromatize the coupling angle characteristics of the waveguide input/output coupler) a hybrid prism/grating coupler is used. The grating produces achromatic coupling over a range which can be as large as 200 nanometers (nm) for typical waveguide materials by compensating for the dispersion due to the change in the effective mode index of the waveguide and the prism with variations in wavelength.

REFERENCES:
patent: 3883221 (1975-05-01), Rigrod
patent: 4338012 (1982-07-01), Matsumura et al.
patent: 4443088 (1984-04-01), Ohtaka
patent: 4801184 (1989-01-01), Revelli
patent: 4838645 (1989-06-01), Machler et al.
Optical Integrated Circuits, H. Nishihara, M. Haruna, T. Suhara, McGraw-Hill Book Co., (1989), especially Chapter 8 thereof.
R. Ulrich, R. J. Martin, "Geometrical Optics & Thin Film Light Guides", Applied Optics, vol. 10, No. 9, Sep. 1971, p. 2077.
J. P. Boyd, C. S. Kuo, "Composite-Prism-Grating Coupler for Coupling Light Into High Refractive Index Thin Film Waveguides", Applied Optics, vol. 15, #7, Jul. 1976, p. 1681.

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