CAJ | 학술논문

针对光学时域反射测量的信噪比受到光子计数的量子起伏的影响,本文提出了光子计数调制技术应用于1.55μm单光子探测光时域反射测量系统,该方法根据相干光场量子涨落的噪声功率在频域上具有均匀分布的特性,采用光子计数调制与锁相放大器解调的方法抑制了量子起伏.实验结果表明,通过改变锁相放大器的积分时间设置滤波带宽,改善了光子计数的信噪比.与光子计数直接测量的结果相比,光子计数调制的光学时域反射测量的信噪改善比达到28.3 dB.
침대광학시역반사측량적신조비수도광자계수적양자기복적영향,본문제출료광자계수조제기술응용우1.55μm단광자탐측광시역반사측량계통,해방법근거상간광장양자창락적조성공솔재빈역상구유균균분포적특성,채용광자계수조제여쇄상방대기해조적방법억제료양자기복.실험결과표명,통과개변쇄상방대기적적분시간설치려파대관,개선료광자계수적신조비.여광자계수직접측량적결과상비,광자계수조제적광학시역반사측량적신조개선비체도28.3 dB.
The low signal-to-noise ratio of photon counting limited its application in the filed of Optics Time Domain Reflection(OTDR)because of the quantum fluctuation.We presented a method using photon counting modulation spectroscopy in OTDR with single photon detection at 1.55 Inn.It is found that the noise amplitude of the quantum fluctuation has a uniform distributing in the frequency domain.The effect from quantum fluctuation has been effectively restrained by using the photon counting modulation and demodulated with lock-in amplifier.The enhancement of signal-to-noise rati6 can be achieved by using setting the filter bandwidth via changing the integration time of the lock-in amplifier.Compared with the direct photon counting measurement,the signal-to-noise improvement ratio could reach 28.3 dB.