Optical: systems and elements – Single channel simultaneously to or from plural channels – By refraction at beam splitting or combining surface
Patent
1996-03-18
1997-04-22
Epps, Georgia Y.
Optical: systems and elements
Single channel simultaneously to or from plural channels
By refraction at beam splitting or combining surface
385 46, G02B 2712
Patent
active
056233698
ABSTRACT:
An optical splitter arrangement is provided for accepting a light from at least one input and providing multiple light outputs of four or more, a light intensity of the outputs differing from one another no more than two dB, and a light intensity of the cumulative outputs differing no more than three dB from the light intensity of the input. The arrangement includes at least one input fiber having a diameter (I) and a numerical aperture (NA), the input fiber providing a light input and projecting the light input into a spot sized to a diameter (D); at least two intermediate ribbon mixing elements, the ribbon mixing elements having a generally constant thickness and height cross-sectional areas with each ribbon mixing element with a cross-sectional endface exposed to the projected spot of input optical fiber, each such ribbon mixing element being exposed to a generally equal area to the spot, and a total thickness of the ribbon mixing elements being approximately equal to D, the endface of the ribbon mixing elements being spaced approximately (D-I)/(2.times.tan theta) wherein theta equals sine.sup.-1 (NA); and a C number of output optical fibers abutting an end of each ribbon mixing element opposite the input optical fiber(s) wherein C is at least two.
REFERENCES:
patent: 4995692 (1991-02-01), Diliello et al.
patent: 5311604 (1994-05-01), Rogner et al.
Helms Ernest E.
Jennings Kurt L.
Lynn Mark A.
Epps Georgia Y.
General Motors Corporation
Helms Ernest E.
Robbins Thomas
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