Method of determining the autocollimation angle of a grating cou

Optics: measuring and testing – For optical fiber or waveguide inspection

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350 9619, G01N 2184, G02B 634

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049520563

ABSTRACT:
The method relates to determining the autocollimation angle of a grating coupler comprising a thin waveguiding film and a diffraction grating. A laser beam is approximately normally directed to the diffraction grating which is mounted at a turntable. The turntable is movable in positive and negative rotational directions through small angles of rotation by a lever arm which is engaged by a micrometer screw driven by a stepping motor until the incoupling condition is satisfied for excitation of a waveguiding mode in the forward and rearward propagation directions in the waveguiding film. The autocollimation angle is determined as the mean value of the two angles of incidence for resonance excitation of the waveguiding modes in the waveguiding film under the incoupling condition.

REFERENCES:
Optics Letters, Band 8, Nr. 10, Oct. 1983, Optical Society of Amerika, W. Lukosz et al.: "Embossing technique for fabricating integrated optical components in hard inorganic waveguiding materials", pp. 537-539, see p. 538, right hand column, lines 4-9 discussed in the subject application.
Electronics Letters, Band 23, Nr. 7, 26 Mar., 1987, (Hitchin, Herts., GB), N. W. Carlson et al.: "Measuremenat of effective index and dispersion in an index-guided surface-emitting distributed Bragg reflector laser", pp. 355-357, see p. 355, right hand column lines 53-55.
Integrated Optics, 1973, IEEE Press (New York, US), M. L. Dakss et al.: "Grating coupler for efficient excitation of optical guided waves in thin films", pp. 144, 145.
JOSA Publication, vol. 6, No. 2/Feb. 1989, K. Tiefenthaler and W. Lukosz: "Sensitivity of grating couplers as integrated-optical chemical snesors".

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