基于光子计数调制的光学时域反射测量  

Optics Time Domain Reflection Measurement by Using Photon Counting Modulation

作　　者：臧鹏程[1] 王晓波[1] 肖连团[1] 贾锁堂[1] 

机构地区：[1]山西大学物理电子工程学院量子光学与光量子器件国家重点实验室,太原030006

出　　处：《光电工程》2010年第3期34-38,共5页Opto-Electronic Engineering

基　　金：国家863计划(2009AA01Z319);973课题(2006CB921603;2006CB921102;2010CB923103);国家自然科学基金(10674086);国家基金创新团队(60821004);新世纪优秀人才支持计划资助(NCET-06-0259)资助

摘　　要：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28.3dB。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 μm. 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 ratio 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 .

关 键 词：单光子探测 光学时域反射测量 光子计数 量子起伏 调制 

分 类 号：O431.2[机械工程—光学工程] TN247[理学—光学]