Publications by authors named "Qiliang Xia"
Article Synopsis
- The paper presents a method to reduce noise in fiber-optic sensing systems using spectral subtraction and statistical noise estimation, aimed at improving signal clarity before demodulation.
- By processing interference signals with averaged noise spectrum estimates from different windowed signals, the technique effectively minimizes noise aliasing.
- Experimental results show a significant average noise floor reduction of 25 dB across the 0-5 kHz range and up to 30 dB at 50 kHz, all without needing extra optical devices, making the system simpler and more cost-effective.
A 3 × 3 coupler multiphase demodulation scheme is proposed to eliminate the impact of working point drifting and the laser relative intensity noise (RIN) on a 3 × 3 coupler interferometric system. An ellipse-fitting algorithm (EFA) is applied to fit the two interference signals of the 3 × 3 coupler in order, then the ATAN algorithm is applied to obtain three noise-containing signals with specific trigonometric relationships. By averaging the three signals, the demodulated phase noise induced from RIN can be effectively eliminated.
View Article and Find Full Text PDF