Multi-pass optical spectrum analyzer having a polarization-dependent tunable filter
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United States of America Patent
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Nov 16, 2004
Grant Date -
Oct 10, 2002
app pub date -
Apr 6, 2001
filing date -
Apr 7, 2000
priority date (Note) -
Expired
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Abstract
A polarization independent optical spectrum analyzer 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. The optical spectrum analyzer 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 (SOPs) and then adjusting one or both SOPs so that they are parallel to each other and to one of the principal axes of the angle-tuned filter which selects different wavelengths of the first and second light beams. The first and second light beams are passed through the filter repeatedly by multi-pass polarization-maintaining optics.
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