同时的光学和射频线性频率扫描生成使用福里埃域模式锁定的OEO与载体抑制单侧带调制
Optics express
|November 22, 2024
概括
本研究提出了一种新方法,用于生成高度连贯的光学和无线电频率线性频率扫描 (LFS),使用锁定Fourier域模式的光电子振荡器. 这一进步为FMCW LiDAR和RADAR等传感应用提供了更好的性能.
科学领域:
- 光电学是指光电子产品.
- 光子学是指光子学的使用方法.
- 传感技术 传感技术
背景情况:
- 线性频率扫描 (LFS) 光源对于FMCW LiDAR至关重要,因为其性能受到连贯度长度和扫描非线性限制.
- 现有的方法通常需要昂贵的任意波形生成器来实现高质量的LFS.
研究的目的:
- 开发一种新的方法来产生高度连贯的光学和同步的射频 (RF) LFS.
- 为了提高传感距离和空间分辨率在应用程序,如LiDAR和雷达.
主要方法:
- 使用了一个锁定Fourier域模式 (FDML) 的光电子振荡器 (OEO).
- 通过双平行马赫-泽恩德调制器 (DP-MZM) 采用载体抑制单侧带 (CS-SSB) 调制.
- 实施了预扭曲技术,以最大限度地减少频率扫描非线性.
主要成果:
- 实现了高质量的光学LFS,侧模式抑制比为27.4dB.
- 产生的双光学和射频LFS的声率为27.27MHz/μs,调范围为0.6GHz,可扩展到142MHz/μs和2.0GHz.
- 减少了剩余的非线性到1.9881 × 10−5 (RMS < 0.764 MHz).
结论:
- CS-SSB FDML-OEO提供了一种具有成本效益的方法,用于生成具有长相干长度和高线性双光学和射频LFS.
- 这项技术适用于先进的FMCW测距系统 (LiDAR,RADAR),3D传感,自动驾驶和光频域反射计 (OFDR).
相关概念视频
01:10Generating Electromagnetic Radiations
2.6K
The German physicist Heinrich Hertz (1857–1894) was the first to generate and detect certain types of electromagnetic waves in the laboratory. Starting in 1887, he performed a series of experiments that confirmed the existence of electromagnetic waves and verified that they travel at the speed of light. Hertz used an alternating-current RLC (resistor-inductor-capacitor) circuit that resonated at a known frequency and connected it to a loop of wire. High voltages induced across the gap in...
2.6K
01:17NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences
762
A pulse is a short burst of radio waves distributed over a range of frequencies that simultaneously excites all the nuclei in the sample. Upon passing a radio frequency pulse along the x-axis, the nuclei absorb energy corresponding to their Larmor frequencies and achieve resonance. This shifts the net magnetization vector from the z-axis toward the transverse plane. This angle of rotation of the magnetization vector, or the flip angle, is proportional to the duration and intensity of the pulse.
762