Zhang Tao, Zhu Jigui, Guo Tinghang, Wang Jing, Ye Shenghua
State Key Laboratory of Precision Measuring Technology and Instruments, Tianjin University, Tianjin, China.
Appl Opt. 2013 May 20;52(15):3495-9. doi: 10.1364/AO.52.003495.
The ultra-long optical fiber of an optoelectronic oscillator (OEO) and the high spectral purity of its high frequency oscillation signal open the possibility of high-accuracy distance measurements at a long range. However, the longer the fiber length in an OEO, the more prone the system is to surrounding disturbance, which in turn leads to fluctuation of the loop delay and a reduction in distance measurement accuracy. In this paper, an intensity modulated light signal is combined with the light signal of an OEO in terms of wavelength division multiplexing (WDM) and is propagated through the fiber. The phase shift has been measured in real time to compensate for variations in fiber delay. With this method, experimental results showed a standard deviation of 14.8 μm.
光电振荡器（OEO）的超长光纤及其高频振荡信号的高光谱纯度为长距离高精度测距开辟了可能性。然而，OEO中的光纤长度越长，系统就越容易受到周围干扰，这反过来又会导致环路延迟的波动和测距精度的降低。在本文中，强度调制光信号通过波分复用（WDM）与OEO的光信号相结合，并通过光纤传播。实时测量相移以补偿光纤延迟的变化。通过这种方法，实验结果显示标准偏差为14.8μm。
