Multiwavelength erbium-doped fiber laser based on frequency shift and polarization hole burning
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摘要: 为了研究能够在室温下实现稳定多波长输出的掺铒光纤激光器,采用了在激光谐振腔中引入正弦相位调制和偏振烧孔来抑制腔中模式竞争的方法。在线形谐振腔中,利用半导体光波导作为一个反射腔镜,并用正弦信号对其进行驱动。这样,半导体光波导可以等效成一个对光信号产生移频反馈效果的正弦相位调制器和一个诱使掺铒光纤中产生偏振烧孔的非线性相位延时器。通过实验,得到了10波长输出的稳定光谱。相邻波长间隔为0.32nm,功率谱比较平坦,起伏小于3dB。结果表明,相位调制和偏振烧孔的共同作用,可有效地抑制由于掺铒光纤的均匀展宽效应引起的模式竞争。Abstract: For realizing a stable multiwavelength erbium-doped fiber laser at room temperature,sinusoidal phase modulation and polarization hole burning are introduced in the laser cavity to suppress the mode competition.In the linear cavity,a semiconductor optical waveguide is used as a reflective mirror,and driven by a sinusoidal signal.The semiconductor waveguide can be classified here as two optical devices:a sinusoidal phase modulator and a nonlinear phase retarder.The sinusoidal phase modulator produces frequency shift for the fiber laser,and the nonlinear phase retarder introduces polarization hole burning in the erbium-doped fiber.Stable lasing with multiple wavelengths up to 10 and wavelength spacing of 0.32nm was demonstrated at room temperature.The power fluctuation was less than 3dB.The results that the phase modulation and polarization hole burning is propitious to suppress the mode competition owing to the homogeneous broaden line.
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