Filter with variable bandwidth or wavelength interval based on chirp rate tuning of fiber bragg grating
A fiber grating, wavelength spacing technology, applied in the coupling of optical waveguides, optics, instruments, etc., can solve problems such as high cost, inconvenient operation, and complexity, and achieve the effect of improving accuracy
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[0020] The following is attached figure 1 , 2 , 3, 4, 5 further describe the technical solution of the present invention.
[0021] The present invention is based on the fiber grating chirp rate tuning bandwidth or wavelength interval variable filter structure diagram as shown in figure 1 shown. Paste the fiber grating 3 at an angle of 3-45 degrees on the side of the right-angled triangular cantilever beam 2, make the midpoint of the fiber grating 3 coincide with the neutral plane, ensure that the maximum strain values at both ends of the fiber grating 3 are equal, and make the tuning range of the reflection spectrum bandwidth to reach maximum. If the center of the fiber grating 3 does not coincide with the neutral plane, the longer side of the fiber grating will be damaged first due to excessive strain.
[0022] figure 2 It is the schematic diagram of the fiber grating chirp rate tuning filter. In the figure, the force on the free end produces a certain displacement, w...
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