Optical filter control
AssigneeLumentum Technology UK Limited
InventorAdrian Perrin Janssen
Life of this patent
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Abstract
An optical filter assembly comprising: a tuneable optical filter; a beam splitter assembly configured to split an input beam into an output beam, a reference beam, and a probe beam, and to direct the output beam and the probe beam through the tuneable optical filter, such that the probe beam is at an angle α to the output beam; a first detector configured to measure the intensity S0 of the reference beam; a second detector configured to measure the intensity S1 of the probe beam after it has passed through the filter; a controller configured to adjust the tuneable optical filter on the basis of the measured intensities of the reference and probe beams.
Claims20
An optical filter assembly comprising:
- a tuneable optical filter;
- a beam splitter assembly configured to:
- split an input beam into an output beam, a reference beam, and a probe beam,
- direct the output beam and the probe beam through the tuneable optical filter such that the probe beam is at an angle relative to the output beam, and
- direct the reference beam to a first detector without directing the reference beam through the tuneable optical filter;
- the first detector configured to measure an intensity of the reference beam;
- a second detector configured to measure an intensity of the probe beam after it has passed through the tuneable optical filter;
- and
- a controller configured to adjust the tuneable optical filter based on the measured intensity of the reference beam and the measured intensity of the probe beam.
A method, comprising:
- splitting, by an optical filter assembly, an input beam into an output beam, a reference beam, and a probe beam;
- directing, by the optical filter assembly, the output beam and the probe beam through a tuneable optical filter of the optical filter assembly,
- wherein the probe beam is directed through the tuneable optical filter at an angle relative to the output beam;
- directing, by the optical filter assembly, the reference beam to a detector without directing the reference beam through the tuneable optical filter;
- measuring, by the optical filter assembly via the detector, an intensity of the reference beam;
- measuring, by the optical filter assembly, an intensity of the probe beam after it passes through the tuneable optical filter;
- and
- adjusting, by the optical filter assembly, the tuneable optical filter based on the measured intensity of the reference beam and the measured intensity of the probe beam.
Dependencies are inferred from the claim text.