Compound optical phase grating and switching devices comprising

Details Compound optical phase grating and switching devices comprising Compound optical phase grating and switching devices comprising

1984-01-27

1986-04-29

Corbin, John K.

35016223, G02B 518

Patent

active

045853070

ABSTRACT:
The invention relates to a compound blazed optical phase grating. The grating comprises at least two grating sections which are disposed opposite each other in parallel planes. The gratings have grooves which extend parallel to each other. The grating sections have equal grating periods and are movable relative to each other within their planes and perpendicular to the grooves. Over one grating period, the optical path length varies at least substantially parabolically and symmetrically relative to the grating period. The path length varies in such a manner that when both grating sections are symmetrically arranged relative to a common line perpendicular to the grating planes, the optical path length through the compound grating is uniform across the grating. Various optical switches and switching matrixes can be formed by using such compound phase gratings.

REFERENCES:
patent: 4257673 (1981-03-01), Matthijsse
patent: 4360251 (1982-11-01), Rajchman
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Minowa, J. et al., "Nonblocking 8.times.8 Optical Matrix Switch for Fiber-Optic Communication," Electronics Lett., vol. 16, No. 11, pp. 422-423 (Apr. 1980).
Philips-Rutz, E. M., et al., "Electrooptic Bragg Diffraction Switches in Low Cross-Talk Integrated Optics Switching Matrix," Applied Optics, vol. 21, No. 12, pp. 2189-2194 (Jun. 1982).
Dammann, H. "Blazed Synthetic Phase-Only Holograms," Optik, vol. 31, No. 1, pp. 95-104 (1970).
Dammann, H., "From Prism-Prism via Grating-Prism to Grating-Grating Compounds," Applied Optics, vol. 19, No. 14, pp. 2276-2278 (Jul. 1980).
Dammann, H., "Spectral Characteristic of Stepped-Phase Gratings," Optik, vol. 53, No. 5, pp. 409-417 (1979).

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