从理论上分析、计算了扭转光纤对小信号电流灵敏度的影响,提出了一种新的更为简便的方法测量费尔德常数,并用实验验证。结果表明当光纤扭转率与固有线双折射的比值大于一定数值时,用本方法测量得到的费尔德常数值与理论值十分接近。这一方法为测量具有线双折射光纤的费尔德常数提供了一种新的途径。

The small signal current sensitivity of twisted fibers is analyzed and calculated theoretically, and a new and more convenient method to measure the Verdet constant is proposed and verified experimentally. The results show that if the ratio of fiber twist rate and intrinsic linear birefringence is large than certain figure the value of measured Verdet constant may quite close to the theoretical calculation. This method provides a new approch to measure the Verdet constant of conventional single mode optical fibers.