Motorized tunable filter and motorized variable attenuator
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United States of America Patent
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Jul 14, 1998
Grant Date -
N/A
app pub date -
Jan 24, 1996
filing date -
Jun 30, 1995
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A tunable filter includes a filter whose characteristic wavelength band changes with the angle of incidence of the incoming light beam with respect to its normal direction, a motor for rotating the filter in order to change the angle of incidence, and a controller controlling the motor to rotate the filter by an amount so that the filter has a desired characteristic wavelength band. A variable attenuator for adjusting insertion loss between an input light beam and an output light beam includes a pair of input and output collimators, a cam connected to at least one of the two collimators, and a motor for rotating the cam for displacing one collimator relative to the other in order to adjust the insertion loss between the input and output light beams.
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