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US 6,639,648 B2Granted
Optical wavelength tuning method and Fabry-Perot type optical tuner
OwnerShoei Kataokainventor
Life of this patent
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Abstract
There is provided a small and lightweight Fabry-Perot type optical tuner. By changing the distance between the reflector plates 3A and 3B with an applied voltage across said reflector plates 3A and 3B, wherein said reflector plates 3A, 3B are supported with coil springs 8A, 8B, and at the same time by changing the refractive index of the liquid crystal material 9, i.e. by utilizing both changes of distance d and refractive index n, an optical tuning can be obtained over a wide range of optical wavelength.
Claims6
A Fabry-Perot type optical tuner, comprising:
- Fabry-Perot type optical cavity wherein a tuned wavelength changes according to the distance between opposing reflector plates;
- a distance changing unit for changing said distance;
- liquid crystal material filled in between said opposing reflector plates having a refractive index changeable by an applied electric field to said liquid crystal material;
- and
- an electric field applying unit for changing the strength of the electric field applied to said liquid crystal material.
2 more elements
Dependencies are inferred from the claim text.