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    • The Radiation Hardness Method of ASE Source Based on the Inhomogeneous Photo-Bleaching Effect

    Xiaowei Wang, Shen Tan,Yan Li,Yong Li, Yafei Zhao,Ningfang Song,Jing Jin

    Optics & Laser Technology（2025）

    Cited 0|Views5
    Abstract
    Photo-bleaching can accelerate the bleaching speed of radiation-induced color centers in erbium-doped fiber (EDF), which is a promising radiation hardening method for amplified spontaneous emission (ASE) sources used for interferometric fiber optic gyroscopes (IFOGs). In existing research, the photo-bleaching process along the EDF is considered to be uniform distribution. However, we discovered that the axial optical power distribution in EDF is inhomogeneous, which makes the on-orbit performance prediction of ASE sources inaccurate. To address this issue, firstly, a composite model of radiation-induced attenuation and the inhomogeneous photo-bleaching process is established, and the power evolution in ASE sources under the radiation environment is extrapolated. Secondly, the numerical simulation and radiation experiment are executed to verify the inhomogeneity of the color centers in EDF. Finally, a radiation hardening method is presented by accelerating the photo-bleaching process of unstable color centers. The experiment result agrees well with the model prediction and reveals that the radiation hardening method can increase the lifetime of ASE sources by ∼ 30 %.
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    Key words
    ASE source,Power distribution,Inhomogeneous photo-bleaching,Radiation hardening
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