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Abstract
The wavelength shift in fiber Bragg grating does not depend directly on the total light levels, losses in the connecting fibers and couplers, or source power. However, if the tunable Fabry-Perot filter is place on the end of incident fiber, the detected time delay of modulation light is occurred due to the unmatch between the scanning time and light transmission time in the transmission fiber. Consequently, the detected peak wavelength shifts with the length of transmission fiber. Thus, the peak wavelength shift effect of Bragg reflective light transmitted in fiber with different fiber length can be obvious in the demodulator with a prepositive tunable Fabry-Perot filter. The experiment indicates the shift rates of 0.109 - 0.126 nm/km increase approximately linearly with the original peak wavelength of 1532.917 - 1560.300 nm at the fiber length of 0 - 6 km. To certify the consistency of measurement data, the criterion correction is introduced. By using the differential method of two fiber Bragg gratings with an optical path, the differential worth is compensated from the disturbance modulated by the time delay of fiber length.
Highlights
Fiber photosensitivity was first observed in germaniumdoped silica fiber in experiments performed by K
By using the differential method of two fiber Bragg gratings with an optical path, the differential worth is compensated from the disturbance modulated by the time delay of fiber length
The shift effect of peak wavelength of Bragg reflective light is produced by changing the length of transmission fiber
Summary
Fiber photosensitivity was first observed in germaniumdoped silica fiber in experiments performed by K. The fiber Bragg gratings represent a key element in the established and emerging fields of optical communications and optical fiber sensing. In the sensing system of fiber Bragg grating, the precision of shift of peak wavelength B should be superior to 0.001 nm for proving the measurement precision of 0.1°C or 1 the measurement precision B defined the measurement precision of whole system. The intensity variations in the light source, the bending on lead/in-out fibers, and a tunable filter can cause signal deviations when a tunable filter scans the Bragg grating sensors [6,7,8]. Found that the intensity variations from the macrobending of the lead-in/ out fibres during high frequency disturbances can cause deviations of the signal when a tunable filter scans the Bragg wavelength [8] Lo etc. found that the intensity variations from the macrobending of the lead-in/ out fibres during high frequency disturbances can cause deviations of the signal when a tunable filter scans the Bragg wavelength [8]
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