Means to lessen unwanted reflections in an optical device

Details Means to lessen unwanted reflections in an optical device Means to lessen unwanted reflections in an optical device

1995-05-16

1996-07-23

Epps, Georgia Y.

Optical: systems and elements

Single channel simultaneously to or from plural channels

By partial reflection at beam splitting or combining surface

385 31, 385 33, 385 34, 385 47, 359583, G02B 2714, G02B 110, G02B 626, G02B 632

Patent

active

055395775

ABSTRACT:
A device for splitting an optical beam into two beams propagating along different optical paths, is provided. The device includes a pair of graded index collimating lenses having their planar collimating ends aligned such that they are both inwardly facing and share a common optical axis. A partially transmitting partially reflective material is disposed between the lenses. At least one of the planar endfaces of the collimating ends are wedge shaped such that a non-zero angle is formed between the two endfaces. This non-zero angle reduces the effect of unwanted optical interference.

REFERENCES:
patent: 4550975 (1985-11-01), Levinson
patent: 4637682 (1987-01-01), Mahlein
patent: 5082343 (1992-01-01), Coult
patent: 5402509 (1995-05-01), Fukushima
Stearns et. al., "Angular Division Multiplexer for Fiber Communication Using Graded-Index Rod Lenses" JOURNAL OF LIGHTWAVE TECHNOLOGY, Aug. 1984, pp. 358-362.

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