在(zai)線式光(guang)(guang)纖(xian)(xian)隔離器(qi)是一種只(zhi)允許光(guang)(guang)以單一方向(xiang)傳輸的無源磁(ci)光(guang)(guang)器(qi)件。它利用(yong)了法拉第旋轉晶體(ti)的非互異性(xing)，可(ke)以有效地抑(yi)制線路中(zhong)從光(guang)(guang)纖(xian)(xian)遠端(duan)端(duan)面(mian)、光(guang)(guang)纖(xian)(xian)連接器(qi)界面(mian)等處產生的反射光(guang)(guang)返(fan)回光(guang)(guang)源，從而防止光(guang)(guang)源受到反射光(guang)(guang)產生的不良影響，提高系(xi)統的穩定性(xing)。
