[1]College of Life Science and Chemistry,Wuhan Donghn University,Wuhan 430074,China;
[2]Wuhan National Laboratory for Optoelectronics,Huazhong University of Science and Technology,Wuhan 430074,China;
[2]Wuhan National Laboratory for Optoelectronics,Huazhong University of Science and Technology,Wuhan 430074,China;
[2]Wuhan National Laboratory for Optoelectronics,Huazhong University of Science and Technology,Wuhan 430074,China;
photo-darkening (PD); ytterbium/aluminum (Yb/Al)fiber; cerium (Ce)ions; thermal bleaching;