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采用掺铒光纤在L 波段的放大自发辐射 (ASE)构成的宽带光信号源在光纤传感、器件测试等方面有着广泛的应用需求 ,而抽运转换是制作这种光源的关键技术之一。基于C 波段放大自发辐射对L 波段信号具有二次抽运作用的机理 ,在光纤的一端采用Sagnac反馈环将输出的C 波段放大自发辐射反馈回到掺铒光纤中 ,这些被反馈的C 波段放大自发辐射像注入的信号光一样消耗上能级粒子数而受到放大并沿光纤的同一方向传输 ,同时成为L 波段放大自发辐射的抽运源。由于Sagnac反馈环减少了泄漏的C 波段放大自发辐射功率 ,因而抽运转换效率大大提高。实验中 ,在不加平坦滤波器的情况下 ,在 12 5mW 980nm抽运光输入时输出L 波段放大自发辐射宽谱功率达到 14dBm ,抽运转换效率 (PCE)达到 2 0 % ,1dB带宽达到 31 1nm(15 6 8 9～ 16 0 0nm) ,获得了高转换效率且宽带平坦的L 波段放大自发辐射谱输出。
Broadband optical signal sources using erbium-doped fiber in the L-band amplified spontaneous emission (ASE) have a wide range of applications in fiber sensing, device testing and other aspects, and pumping conversion is one of the key technologies for making such a light source. Based on the C-band amplification mechanism of spontaneous emission on the L-band signal with a secondary pumping mechanism, a Sagnac feedback loop is used at one end of the fiber to output the C-band amplified spontaneous emission back to the erbium-doped fiber. These feedback C-band amplifications Spontaneous emission, like the injected signal light, consumes the upper energy level particles and is amplified and transmitted in the same direction of the optical fiber, simultaneously becoming a L-band pumping source for amplifying spontaneous emission. Since the Sagnac feedback loop reduces the leakage of the C-band to amplify the spontaneous emission power, the pumping conversion efficiency is greatly improved. In the experiment, L-band output of 12 5mW 980nm pump light was input without amplifying filter, the wide-band power of spontaneous emission was amplified to 14dBm, the PCE reached 20% and the 1dB bandwidth reached 31 1 nm (15 6 8 9 ~ 16 0 0nm), a L-band amplified spontaneous emission spectrum output with high conversion efficiency and wideband is obtained.