Abstract
The radiation effects of three Er3+-doped superfluorescent fiber sources (SFSs), which are based on three segments of Er-doped fibers with different lengths, are studied experimentally. We observed that the radiation-induced attenuation of the signal light of the 1530 nm band for an SFS is less than that of the 1560 nm band. Thus, the trimming technique of the Gauss-like spectra is investigated to reduce the mean wavelength drift. A filter was customized and used in superfluorescent fiber sources. To further reduce output power loss, the method with feedback control of pump power was adopted in the SFS. Then, the trimming spectral SFS with pump feedback control was tested under irradiation environment at the dose rate of 2.988 Gy/h. The experimental results demonstrate that the mean wavelength drift is <40 ppm and the loss of output power is <0.2 dB under a total dose higher than 1000 Gy. These findings confirm the significance of the method in improving radiation-resistant capabilities of fiber sources under irradiation environments.
Highlights
Interferometric fiber optic gyroscopes (IFOGs) have potential application in spacecraft and satellite space missions due to their numerous advantages, such as high reliability, long life, light weight, high resolution, as well as stable scale factor [1,2,3]
The rest of the superfluorescent fiber source (SFS) components were exposed to rays, except the laser diodes (LDs) driver board that was shielded with lead bricks
The drive current of the pump LD was adjusted by using the feedback control to compensate the radiation-induced power loss of the SFS
Summary
Interferometric fiber optic gyroscopes (IFOGs) have potential application in spacecraft and satellite space missions due to their numerous advantages, such as high reliability, long life, light weight, high resolution, as well as stable scale factor [1,2,3]. In meeting the requirements of navigation-grade IFOGs, its light source is usually an Er-doped superfluorescent fiber source (SFS) [1,2], whose high-stability mean wavelength and output power can achieve low bias drift and stable scale factor for IFOG application [3]. Yang et al [3,4] proposed the method of edge filter and closed-loop feedback control of pump current to manage the overall radiation-induced power attenuation and achieve a mean wavelength stability of 87.4 ppm. Our previous work has shown that spectral trimming [11,12] and Er/Ce co-doped fiber [13] can effectively reduce the mean wavelength drift of the SFS and enhance the radiation tolerance of EDF. Under a total dose higher than 1000 Gy, the mean wavelength drift is less than 40 ppm and the output power loss is less than 0.2 dB
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