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提出了一种基于非线性偏振旋转(NPR)效应的可调谐多波长掺铒光纤(EDF)激光器,非线性偏振旋转诱导的强度相关非均匀损耗有效地抑制了均匀加宽增益介质掺铒光纤中的模式竞争,使光纤激光器在室温下产生稳定的多波长输出。其中利用保偏光纤和偏振相关隔离器组成的等效Lyot双折射光纤滤波器作为波长选择器件,该滤波器可以通过选择合适的双折射光纤长度改变波长间隔,调节偏振控制器改变偏振态实现对波长的精密调谐。实验采用10 m长的保偏光纤(PMF),得到了波长间隔为0.35 nm、最多17个波长的稳定激光输出,并且实现了输出波长在4 nm范围内的连续可调谐。分别采用10:90、30:70和50:50的输出耦合器,激光信号分别从10%、30%和50%的端口输出,得到了最多17、14和13个波长的输出,其波长功率浮动分别为13 dB、10 dB和7 dB,另外,其最大输出功率分别为-7 dBm、-3 dBm和0 dBm。实验结果表明,输出耦合器输出端比例越大,输出波长就越少,各波长激光输出功率越平坦,且输出功率越高。
A tunable multi-wavelength erbium-doped fiber (EDF) laser based on the nonlinear polarization rotation (NPR) effect is proposed. The intensity-dependent non-uniform loss induced by nonlinear polarization rotation effectively restrain the uniform broadening of the gain medium in erbium-doped fibers Mode competition, the fiber laser to produce stable multi-wavelength output at room temperature. The equivalent Lyot birefringent fiber filter composed of polarization-maintaining fiber and polarization-dependent isolator is used as the wavelength selection device. The filter can be adjusted by selecting the appropriate length of birefringent fiber to change the wavelength interval and adjusting the polarization controller to change the polarization state Fine tuning of the wavelength. The experimental use of 10 m long polarization-maintaining fiber (PMF), obtained a stable laser output wavelength interval of 0.35 nm, up to 17 wavelengths, and to achieve continuous tunable output wavelength in the 4 nm range. Using 10: 90, 30:70 and 50:50 output couplers, laser signals are output from 10%, 30% and 50% ports, respectively, resulting in outputs of up to 17, 14 and 13 wavelengths with wavelength power Floats of 13 dB, 10 dB and 7 dB, respectively, and the maximum output power is -7 dBm, -3 dBm and 0 dBm, respectively. The experimental results show that the larger the output ratio of the output coupler is, the less the output wavelength is. The more flat the laser output power is at each wavelength and the higher the output power is.