G - Physics – 02 – B
Patent
G - Physics
02
B
G02B 5/20 (2006.01) G01J 3/26 (2006.01) G01J 3/447 (2006.01) G02B 5/30 (2006.01) G02B 27/28 (2006.01)
Patent
CA 2304898
A polarization independent tunable optical filter comprises an inherently polarization sensitive angle-tuned filter element and polarization-maintaining multi- pass optics for directing a light beam to and fro through the tunable filter element while maintaining its linear state of polarization. An optical spectrum analyzer apparatus comprises such a tunable optical filter in combination with a polarization control unit for decomposing a light beam for analysis into first and second beams having mutually orthogonal states of polarization states that are parallel to each other and with one of the principal axes of an inherently polarization sensitive angle-tuned filter which selects different wavelengths of the first and second light beams. The light beams are passed through the filter repeatedly by multi-pass polarization-maintaining optics. The filtered first and second light beams are detected and summed to distinguish the energy at the selected wavelength. Multi- pass optics capable of correcting for inaccuracies in right-angle reflectors are diclosed and may be used in equipment other than such tunable optical filters or optical spectrum analyzers.
Gariepy Daniel
He Gang
Lamonde Martin
Schinn Gregory Walter
Adams Thomas
Exfo Electro-Optical Engineering Inc.
Gariepy Daniel
He Gang
Lamonde Martin
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