针对传统的L-band EDFA的工作效率低,提出了一种基于单根光纤光栅、泵浦分配、两段级联的EDFA的新结构,其中的光纤光栅用来反射无用的后向C-band ASE.系统地研究了泵浦比例和光纤光栅波长对增益噪声指数的影响关系.最后经实验验证,得到了低噪声、高增益的L-band的EDFA.其在输入信号光(1570 nm)功率为-30 dBm及泵浦功率为70 mW时,增益为22.26 dB,增益噪声指数为4.96 dB.

A new two-stage L-band erbium doped fiber amplifier (EDFA) structure with a single fiber grating is introduced to solve the problem of poor power conversion efficiency of a conventional L-band EDFA. A mid-way isolator is used in the structure to improve the noise figure. The fiber grating is used to reflect the wasted C-band backward amplified spontaneous emission (ASE). The influence of the pump power ratio and the Bragg wavelength to the characteristics of this EDFA is studied experimentally. For such an EDFA structure with a pump power of 70 mW, 22.26 dB gain and 4.96 dB noise figure is obtained for a 1570 nm signal with an input power of-30 dBm.