Variable optical attenuator
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United States of America Patent
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-
Apr 22, 2003
Grant Date -
Sep 13, 2001
app pub date -
Jan 17, 2001
filing date -
Jan 21, 2000
priority date (Note) -
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status (Latency Note)
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Abstract
A method and apparatus for variable optical attenuation is disclosed. A variable optical attenuator is provided having a housing. Within the housing, a filter is mounted on a drive shaft of a motor such that the drive shaft passes through a substantially center point of the filter. The filter has a monotonically increasing filter gradient that begins at a lower optical density and gradually increases in optical density in a diametrical pattern. An input optical fiber provides a light signal to be attenuated. The input optical fiber introduces the light signal, which passes through a first collimator, through the filter, through a second collimator, and to an output optical fiber which exits the housing. When activated, the motor rotates the drive shaft to position the filter to a desired attenuation position for attenuating the light signal.
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