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实现了一种基于非线性偏振旋转(NPR)的可调谐多波长掺铒光纤(EDF)激光器。偏振相关隔离器和保偏光纤(PMF)是激光器的关键组件。非线性偏振旋转会引起腔体的自滤波和光强的峰值限制效应,从而能有效地减弱掺铒光纤均匀加宽所造成的强烈模式竞争,形成稳定的常温多波长振荡。腔损耗的色散特性使激光输出波长在5 nm内可连续调谐。由于激光腔的自滤波周期由腔内双折射强度决定,也可以通过改变保偏光纤的有效长度来实现。当用两段保偏光纤和偏振控制器组合后,实验中得到了间隔为0.25 nm和0.75 nm可调谐的稳定多波长振荡。
A tunable multi-wavelength erbium-doped fiber (EDF) laser based on non-linear polarization rotation (NPR) is realized. Polarization-dependent isolators and polarization-maintaining fibers (PMFs) are key components of lasers. The non-linear polarization rotation will cause the peak self-filtering and light intensity limiting effect of the cavity, which can effectively reduce the intense mode competition caused by the even widening of the erbium-doped optical fiber and form a stable multi-wavelength oscillation at room temperature. The dispersion of cavity loss allows continuous tuning of the laser output wavelength within 5 nm. Since the self-filtering period of the laser cavity is determined by the birefringence in the cavity, it can also be achieved by changing the effective length of the polarization maintaining fiber. When combined with two polarization maintaining fibers and a polarization controller, stable multi-wavelength oscillations tunable at 0.25 nm and 0.75 nm were obtained experimentally.