Compact polarization independent optical switching units

Details Compact polarization independent optical switching units Compact polarization independent optical switching units

1992-12-21

1994-06-07

Sikes, William L.

Optical: systems and elements

Holographic system or element

Using a hologram as an optical element

359140, 342375, G02F 11335, H01Q 334

Patent

active

053194772

ABSTRACT:
A compact optical switching unit includes a polarization independent beamsplitter switch (PIBS) coupled to a delay path apparatus such that incident light beams are respectively selectively directed along either a direct path or a delay path dependent on the the manipulation of the polarization of polarized constituent light beams in the PIBS. The delay path apparatus is typically a mirror prism or fiber optic cable disposed such that light deflected onto the delay path traverses a longer distance than light passing along the direct path and thus a particular light beam can be selectively time delayed by controlling the PIBS to direct the beam into desired delay paths in a cascade of optical signal switching units. A compact and readily fabricated cascade of optical switching units includes PIBS blocks, a portion of which constitutes the PIBS 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: 4478494 (1984-10-01), Soref
patent: 4836658 (1989-06-01), Laycock
patent: 5117239 (1992-05-01), Riza
patent: 5231405 (1993-07-01), Riza
Wagner & Cheng, "Electrically Controlled Optical Switch for Multimode Fiber Applications", Applied Optics, Sep. 1, 1980, vol. 19, No. 17, pp. 2921-2925.

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