Compact polarization dependent optical switching units

Details Compact polarization dependent optical switching units Compact polarization dependent optical switching units

1992-12-21

1994-09-06

Sikes, William L.

Optical: systems and elements

Holographic system or element

Using a hologram as an optical element

359 41, 359140, 342375, G02F 11335, H01Q 322

Patent

active

053453212

ABSTRACT:
A compact optical switching unit includes a spatial light modulator coupled to a delay assembly such that incident light beams are respectively selectively directed along either a direct path or a delay path dependent on the linear polarization of the light beam. The delay assembly includes a light deflection device, such as a polarizing beam splitter, coupled to a delay path apparatus, such as mirror prisms or fiber optic cable. A compact and readily fabricated cascade of optical switching units includes polarizing beam splitter blocks and polarization rotation switch blocks, a portion of which constitutes the polarizing beamsplitters and spatial light modulators in respective optical switching units sequentially optically coupled. Delay path apparatuses disposed along an axis orthogonal to both the axis of beams passing along a direct path through polarizing beam splitter switches on the direct path and the axis between respective optical switching units result in a compact optical architecture.

REFERENCES:
patent: 4516837 (1985-05-01), Soref et al.
patent: 5117239 (1992-05-01), Riza
patent: 5231405 (1993-07-01), Riza
Dolfi et al., "Two-dimensional Optical Architecture for Time-Delay Beam Forming in a Phased-array Antenna", Optics Letters, Feb. 15, 1991, vol. 16, No. 4, pp. 255-257.
Dolfi et al., "Optically Controlled True Time Delays for Phased Array Antenna", SPIE vol. 1102, Optical Technology for Microwave Applications IV (1989), pp. 152-161.

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