Optical switch having low cross-talk for wide range of wavelengt

Details Optical switch having low cross-talk for wide range of wavelengt Optical switch having low cross-talk for wide range of wavelengt

1984-04-11

1987-05-26

Punter, William H.

350387, 350388, 350405, B02B 2728, G02F 109

Patent

active

046680527

ABSTRACT:
An optical switch including a first polarization converter and a second polarization converter which is provided in series with the first polarization converter.
The first and second converters are able to select as emitted light one of two perpendicular polarized light components of incident light having a desired wavelength (.lambda..sub.0) in a polarized state. The first polarization converter converts the incident light having wavelength .lambda..sub.0 into a polarized light component corresponding to one of two points positioned on opposite sides of a Poincar/e/ sphere. The two points on the Poincar/e/ sphere are obtained by rotating the incident light +90.degree. or -90.degree.. The incident light is rotated around an axis perpendicular to an axis passing through a point corresponding to the incident light on the Poincar/e/ sphere and the center of the Poincar/e/ sphere. The second polarization converter converts the polarized light obtained by the first polarization converter into polarized light corresponding to a point obtained by rotating the two polarized light components at +90.degree. or -90.degree. around an axis passing through the above-mentioned two points on the Poincar/e/ sphere.

REFERENCES:
patent: 3558214 (1971-01-01), DeLang et al.
patent: 3558215 (1971-01-01), DeLang et al.
Jerrard, H. G., "Transmission of Light Through Birefringent & Optically Active Media: The Poincar/e/ Sphere", Jr. Op. Soc. Am. 8-1954, pp. 634-638.
Bennett et al., "Polarization, "Sec 10 of Handbook of Optics", Driscoll et al., Editors, 1978, McGraw Hill, pp. 10-139-140.
Pancharatnam, S., "Achromatic Combinations of Birefringent Plates", Proc. Indian Acad. of Sciences, 4-1955, pp. 130-136.
Bennett et al., "Polarization", Sec. 10 of Hndb. of Optics, Driscoll et al., Editors, McGraw Hill 1978, pp. 10-105.

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