Fiber-optic filter with tunable grating
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United States of America Patent
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Nov 7, 2006
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app pub date -
Dec 4, 2003
filing date -
Dec 4, 2003
priority date (Note) -
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Abstract
A tunable optical fiber has a grating which is attached to an expander responsive to an external control including a temperature or a magnetic field. The expander changes length, and this is coupled to the optical fiber, which changes pitch, thereby accomplishing a tuning change. The expander may be coupled to the grating directly, or through an expansion reducer, which produces a greater range of tuning. Terfenol-D.TM. may be used for the expander material, and tubes which include a bonding point adjacent to the extents of the grating may form the extent reducers.
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