,A Flat-Gain Double-Pass Amplifier with New Hafnia-Bismuth-Erbium Codoped Fiber

• 作 者: Alabbas A.Al-Azzawi Aya A.Almukhtar P.H.Reddy D.Dutta S.Das A.Dhar M.C.Paul U.N.Zakaria S.W.Harun
• 机 构: Photonics Engineering Laboratory, Department of Electrical Engineering, University of Malaya, Kuala
• 出 处: 中国物理快报（英文版）
• 发表日期: 2018年5期

An efficient and compact double-pass optical fiber amplifier is demonstrated using a newly developed hafnia bismuth erbium co-doped fiber (HBEDF) as a gain medium.The HBEDF is fabricated using a modified chemical vapor deposition in conjunction with solution doping.The fiber has an erbium ion concentration of 12500ppm.At the optimum length of 0.5m,the HBEDF amplifier (HBEDFA) achieves a fiat gain of 26dB with a gain variation of less than 1.5dB within a wavelength region from 1530 to 1560nm when the input signal and pump power are fixed at-30dBm and 140mW,respectively.On the other hand,at the input signal power of-10dBm,the HBEDFA also achieves a fiat gain of 14,2 dB with a gain variation of less than 2.5 dB within a wide wavelength region from 1525 to 1570nm.Compared with the conventional zirconia erbium co-doped fiber based amplifier,the proposed HBEDFA obtains a more efficient gain and lower noise figure.For an input signal of-30dBm,the gain improvements of 6.2 dB and 4.8 dB are obtained at 1525 nm and 1540 nm,respectively.