研究了1 064 nm波长双向泵浦的掺铥石英光纤放大器(TDSFA),测量了信号开关增益随泵浦功率和信号波长的变化情况.在最大入纤功率1 400 mW泵浦下,放大器在1 485～1 517 nm的较宽范围内具有放大能力,最大增益3.76 dB.分析表明,弱的基态吸收和强的激发态吸收限制了放大器增益的进一步提高,表明上转换泵浦的TDSFA是可行的.

The TDFA (Thulium-Doped Fiber Amplifier) is a promising candidate for an amplifying device in S band. We established a bi-directionally pumped Thulium-Doped Silica Fiber Amplifier (TDSFA) with a single 1 064 nm pump wavelength in order to know the characteristics of the amplifier. The on-off gain was measured for simplicity. The gain varying with pump power and with signal wavelength was studied in detail. At the maximum launched pump power of 1 400 mW, the amplifier had a gain over a wide wavelength region of 1 485 to 1 517 nm, with a peak gain of 3.76 dB. Weak GSA (Ground-State Absorption) and strong ESA (Excited-State Absorption) limit the further increase of the gain. The results show that TDSFA is operable using such an upconversion pumping scheme.