Frequency-selective optical switch employing a frequency dispers

Details Frequency-selective optical switch employing a frequency dispers Frequency-selective optical switch employing a frequency dispers

1993-09-22

1995-05-09

Sikes, William L.

Optical: systems and elements

Holographic system or element

Having optical element between object and recording medium

354 94, 354122, 354128, 354124, 385 37, 385 20, 385 17, 359 93, 359245, 359246, G02F 1137, G02F 113, H04J 1406, H04J 1402

Patent

active

054145406

ABSTRACT:
A liquid-crystal optical switch capable of switching separate optical signals in a physical input channel to a selected output channel. A diffraction grating spatially divides the input channel into its frequency components, which pass through different segments of a liquid-crystal modulator. The liquid-crystal modulator segments are separately controlled to rotate the polarization of the frequency channel passing therethrough or to leave it intact. The channels then pass through a polarization-dispersive element, such as calcite, which spatially separates the beams in the transverse direction according to their polarization. A second diffraction grating recombines the frequency components of the same polarization into multiple output beams.

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I. Nishi et al., "Broad-passband-width optical filter for multi/demultiplexer using a diffraction grating and a retroreflector prism," Electronics Letters, 1985, vol. 21, pp. 423-424.
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Shirosaki et al., "Bistable magnetooptic switch for mutwork optical fiber", Applied Optics vol. 21, #11, Jun. 1, 1982, pp. 1943-1949.

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