Optical waveguides – With optical coupler – Switch
Patent
1995-05-25
1996-08-13
Bovernick, Rodney B.
Optical waveguides
With optical coupler
Switch
385 25, G02B 626, G02B 642
Patent
active
055464840
ABSTRACT:
A fiber optic switch module that can be incorporated into switch designs characterized by negligible crosstalk. The switch module is capable of operation over two wavelength bands. A 2.times.2 switch module has an open or bar state in which polished portions of the fiber segments are separated from each other and a closed or cross state where the polished portions are in optical contact with each other. The module has arbitrarily low crosstalk in the bar state, but typically some crosstalk in the cross state. In one embodiment, the third port of a first 2.times.2 module is coupled to the first port a second 2.times.2 module while no connections are-made to the second ports of the modules or to the third port of the second module. Fiber parameters (core radius and numerical aperture) and fabrication parameters (radius of curvature of the fibers in the interaction region and minimum edge-to-edge spacing between the fiber cores) are chosen so that the switch module has high coupling ratio (close to unity) in two distinct wavelength bands.
REFERENCES:
patent: 5011251 (1991-04-01), Miller et al.
patent: 5148503 (1992-09-01), Skeie
Digonnet Michel J.
Fling John J.
Kapany Narinder S.
Shaw Herbert J.
Bovernick Rodney B.
Kaptron, Inc.
Wise Robert E.
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