【摘要】 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。更多还原

【Abstract】 A tunable multi-wavelength erbium-doped fiber (EDF) laser based on nonlinear polarization rotation (NPR) is realized.A polarization-dependent isolator and a polarization-maintained fiber (PMF) are used as key elements of the laser.Both effects of self filtering and peak clamping generated from NPR, effectively alleviating the mode competition resulted from the homogeneous broaden of the EDF, ensure stable multi-wavelength operation at room temperature.The dispersive property of the cavity loss allows the lasing wavelength to be tuned within a range of 5 nm.Wavelength spacing can also be tuned by changing the effective length of PMFs, the period of the self filtering is determined by the birefringence of the cavity.Stable multi-wavelength operation with wavelength spacing of 0.25 nm and 0.75 nm is obtained as two pieces of PMFs and a polarization controller are combined into the cavity.更多还原