光纤弱值放大中的振幅型噪声和一种抑制方法

Suppressing Amplitude-type Noise in Fiber Optic Weak Value Amplification

弱值放大(WVA)技术可以实现高灵敏度和高精度的光学测量,已经在自由空间平台上得到实验验证。而自由空间平台存在部分光学器件集成化较难、平台稳定性稍弱等问题。要将WVA技术推广到实际应用中,可以利用具有成本更低、规模更小、稳定性更高这些优点的光纤平台。但是,与自由空间平台相比,光纤中的双折射现象更强,足以引起偏振串扰,因此必须考虑振幅型噪声在光纤平台方案中的影响。本文从理论上分析,表明了振幅型噪声会在探测光谱上形成噪声波纹,并损害WVA的灵敏度性能。为了克服这个问题,本文提出了一种后处理方法,仿真的结果表明处理方法的有效性、基于光纤实现WVA的可行性,这为将来设计具有更高灵敏度和稳定性的光学传感器提供了一种可能的方式。

Experiments based on free space platform have demonstrated that the weak value amplification(WVA)technique can provide high sensitivity and precision for optical metrology.To promote this technique for real-world applications,it is more suitable to implement WVA based on optical fiber platform due to the lower cost,smaller scale and higher stability.In contrast to the free space platform,the birefringence in optical fiber is strong enough to cause polarization cross talk,and the amplitude-type noise must be taken into account.In theory,we deduct that the effect of amplitude-type noise will form noise ripples on the detection spectrum and can significantly compromise the sensitivity of WVA.To overcome this problem,a post-processing method is proposed and simulation results show the effectiveness of the method.Our results indicate the feasibility of implementing WVA based on optical fiber,which provide a possible way for designing optical sensors with higher sensitivity and stability in the future.