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提出了一种新型的可调谐光纤激光器 ,其谐振腔是由声光可调谐波长滤波器 (AOTF)和掺铒光纤构成的Fabry Perot腔。该激光器具有调谐方便 ,调谐速度快和调谐范围大的优点。在忽略激发态吸收和放大的自发辐射情况下 ,对该激光器的线宽和调谐特性以及阈值抽运功率和斜率效率进行了理论计算。在中心工作波长 15 5 0nm处 ,得到输出峰值的半极大值线宽 (FWHM)约为 0 2 6nm ,并且在 15 5 0nm附近 ,声波频率每改变 1MHz所调谐的峰值波长间隔约为 8 95nm。理论上 ,调谐范围只受掺铒光纤增益和滤波器带宽的限制。计算结果表明 ,该激光器的阈值抽运功率和斜率效率分别为 0 795mW和 15 15 %。
A new type of tunable fiber laser is proposed. The resonator is a Fabry Perot cavity consisting of an AOTF and an erbium-doped fiber. The laser has the advantages of easy tuning, high tuning speed and large tuning range. Ignoring the excited state absorption and amplification of spontaneous emission, theoretical calculation of the linewidth and tuning characteristics of the laser and the threshold pumping power and slope efficiency are carried out. At a central operating wavelength of 1550 nm, the half-maximum width (FWHM) of the output peak is about 0 2 6 nm and the peak wavelength spacing tuned for every 1 MHz change in acoustic frequency around 15 5 0 nm is about 8 95 nm . In theory, the tuning range is limited only by the gain of the erbium-doped fiber and the bandwidth of the filter. The calculated results show that the threshold pumping power and slope efficiency of the laser are 0 795mW and 15 15% respectively.