本振子
相位噪声
反射计
信噪比(成像)
动态范围
量化(信号处理)
时域
信号(编程语言)
光学
电子工程
计算机科学
物理
算法
工程类
计算机视觉
程序设计语言
作者
Wen Zuo,Hao Zhou,Xiaobin Hong,Yaojun Qiao
出处
期刊:Optical Engineering
[SPIE - International Society for Optical Engineering]
日期:2023-06-28
卷期号:62 (06)
标识
DOI:10.1117/1.oe.62.6.066106
摘要
A power-tunable local oscillator (LO) is utilized for long-distance phase-sensitive optical time-domain reflectometry (ϕ-OTDR) systems. The scheme uses a LO whose power is intentionally varied inversely with the backscattered signal power to suppress the dynamic signal range before receiving, which realizes a higher far-end signal-to-noise ratio (SNR) while avoiding receiver power saturation. Meanwhile, the suppressed signal range allows for the use of low-resolution analog-to-digital converters (ADC). We implemented the scheme over a 98-km standard single-mode fiber, and the results show that the scheme achieves a 3.4 dB far-end SNR improvement. When the ADC resolution decreases from 13 to 8 bits, the proposed scheme shows a negligible SNR penalty. Compared to systems using power-fixed LO and 8-bit ADCs, our proposed scheme achieves a 4.8-dB reduction in self-phase noise power under the same conditions.
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