Research On Anti-radiation Super-fluorescent Fiber Source

As an ideal candidate for fiber optic gyroscope(FOG), the erbium-doped super-fluorescent fiber source(EDSFS) has been widely used in aerospace and mUitary fields. But harsh radiation enviironment reduces 1:he mean wavelength stability and output power of the EDSFS,affects the normal work of the EDSFS, and reduces the safety and reliability of the FOG. Therefore, the study of the radiation-Ksistant EDSFS for FOG has important practical vahie. This paper studies the anti-radiation capacity of EDSFS by experiment.Th studies the radiation-induced effects of the defect generated by the doped EDF wUh different elements.The radiation model of the EDSFS is established,basing onne basic structure and working princle of EDSFS.The ielaticmship between the power radiation induced attenuation of EDF and The concentration of color centers based on radiation total doseradiation dose rate and the coefficient of the erbium-dopedber materials is introduced..The experimental pre—irradiation Gaussian and twin-peak EDSFS are investigated Two radiation experiments on The above two sources are implemented in The Co gamma ray environment wiTh the radiation doTh rate of 0.083rad/s and radiation total doTh of 493.63 Gy and502.08 Gy.The interval of the two experiments was 10 months. The radiation-induced attenuation of the Gaussian EDSFS and the twin-peak EDSFS were 2.172 dB and 1.858respectively. The mean wavelength of the Gaussian EDSFS changed by 58.46 ppm(0.0896 nm)and 174.78 ppm(0.268nm), and the mean wavelength of the twin-peak EDSFS changed by78.86 ppm(0.1219 nm) and 296.68 ppm(0,459nm). After an 800 h recovery test, the output power of The Gaussian EDSFS stored by 0.131 and 0.317 respvdy,and The output power of The twin-peak EDSFS restored by 0.431 and 0.961 respectively. The perimenprove that pre-irradiation has a good effect 0n strengthening the anti—radiation capacity of the optical fiber.Finally,The anti-radiation capacity of the Gaussian pre-peak erbium-doped fiber source and the Gaussian post-peak erbium-doped fiber source are studied. Under the condition of Thegamma ray radiation wiTh the radiation doTh rate of 0.083rad/s and radiation total dose of502.08 Gy, the mean wavelength of the Gaussian pre-peak erbium-doped fiber source and the Gaussian post-peak erbixim-doped fiber source were 191.73 ppm(0.294 nm) and 226.53 ppm(0.354nm) respectively, and the output power decreased by 14.18% and 84.07% respectively.After an SOOh irradiation t:est,the mean wavelength of the Gaussian pre-peak erbium-doped fiber source and the Gaussian post-peak erbium-doped bersource restored by 80.18>pm(0.123nm) and 170.25ppm(0.266 nm) respectively,and the output power restored by 0.307and 2.603espectiyelyTh shows That the Gauian pre-peak erbium-doped ber source has better anti-radiation capacity in terms of mean wavelength and output power,and The stable.