Temperature sensing system of fiber laser based on fiber Farby-Perot filter
A method of fabricating optical fiber microcavity based on hydrofluoric acid etching technology is proposed and de-signed.An all-fiber(Fabry-Perot,F-P)multi-beam interference filter structure is formed by welding a 4.5mm long single-mode optical fiber.The main interference spectrum period is 20.7nm and the secondary interference spectrum period is 1.4nm;on this basis,the fiber F-P filter as the frequency selection device constitute an erbium-doped fiber laser system,and narrow line-width laser output with center wavelength of 1560.40nm,signal to noise ratio of 15.441dB and 3dB linewidth of 0.28nm is realized.In the experiment,the optical fiber F-P filter was heated and cooled by the temperature heating platform in the experimental temperature range of 360～430℃.The laser wavelength was red-shifted during the heating process,and the temperature sensitivity of the sensing system was 13.80pm/℃,the linear fitting degree is 99.82％;the temperature sensitivity of the laser sensing system during the cooling process is 13.36pm/℃,and the linear fitting degree is 99.44％.The experimental results provide a laser system measurement method for high-precision high-temperature sensing.
optical fiber F-P filterfiber laserHF acidoptical fiber temperature sensor
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