研究了一种结构新颖、光谱特性可精确控制的Sagnac环滤波器,此滤波器通过在传统Sagnac环中插入两段高双折射光纤和一个偏振控制器构成.利用等效光路和传输矩阵法理论研究了该滤波器的滤波特性.研究结果表明:固定两段高双折射光纤参数,仅通过调整偏振控制器的状态,便可精确控制Sagnac环滤波器的滤波光谱特性.将Sagnac环滤波器用于掺铒光纤(EDF)放大自发辐射(ASE)光源的光谱平坦滤波,通过调节偏振控制器三个波片的倾斜角度,实验获得了光谱平坦的宽带ASE激光.
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