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Theory and design of a simple tunable Sagnac loop filter for multiwavelength fiber lasers

机译:用于多波长光纤激光器的简单可调谐Sagnac环路滤波器的理论和设计

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摘要

We present a novel design for a Sagnac loop filter (SLF) whose periodic output spectrum can be fully controlled by cascading a small-birefringence loop (SBL) with a high-birefringence loop (HBL). We develop a detailed theoretical analysis, using the Jones vector method, to calculate the transfer function of the tunable SLF. It has been quantitatively shown that both the transmission coefficient and the phase of the SLF can be controlled by adjusting the orientation angle of the birefringent axes of the SBL in the plane of polarization. The theory has been confirmed by experimental results where a stress-induced SBL was mechanically rotated to tune both the wavelength and the power of a periodic output spectrum. Such a tunable SLF is used in the design of a multiwavelength erbium-doped fiber laser in the C band.
机译:我们提出了一种Sagnac环路滤波器(SLF)的新颖设计,该滤波器的周期输出频谱可以通过将小双折射环路(SBL)与高双折射环路(HBL)级联来完全控制。我们使用琼斯向量法开发了详细的理论分析,以计算可调SLF的传递函数。定量地表明,通过调节偏振平面中SBL的双折射轴的取向角,可以控制SLF的透射系数和相位。该理论已通过实验结果得到了证实,其中应力引起的SBL被机械旋转以调谐周期输出光谱的波长和功率。这种可调谐的SLF用于C波段的多波长掺fiber光纤激光器的设计中。

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