相关实验视频
Updated: Sep 9, 2025

06:42
Generation and Coherent Control of Pulsed Quantum Frequency Combs
Published on: June 8, 2018
9.1K
概括
本研究引入了一种使用主动时域模式锁定 (TDML) 的可控制频率跳转 (FH) 光电子振荡器 (OEO). 该OEO生成具有可调节参数的二进制FH信号,克服模式竞争问题.
科学领域:
- 光子学和光学
- 微波工程
- 信号处理
背景情况:
- 光电子振荡器 (OEOs) 对于产生稳定的微波信号至关重要.
- 频跳信号对于安全的通信和雷达系统至关重要.
- 在没有模式竞争的OEO中控制FH参数仍然是一个挑战.
研究的目的:
- 提出和实验证明可控制的频率跳跃 (FH) 光电子振荡器 (OEO).
- 实现主动时间域模式锁定 (TDML) 以精确生成FH信号.
- 克服传统FH OEO设计中固有的模式竞争问题.
主要方法:
- 采用相位调制到强度调制 (PM-IM) 转换的双通带微波光子波器 (MPF) 的实施.
- 使用由同步电控信号调节的两个激光二极管 (LD) 来定义可调的MPF子传输带.
- 通过同步控制信号频率与OEO的自由光谱范围来实现TDML.
主要成果:
- 无模式竞争的可控制FH信号生成方案的演示.
- 产生可调节时间,载波频率和子信号重复周期的二进制FH信号.
- 试验验证FH速度 (~21 ns),时间持续时间 (14.75 μs),频率范围 (618 GHz) 和重复周期 (14.75 ns147.5 μs).
结论:
- 基于主动TDML的FH OEO提供了对FH信号参数的精确控制.
- 这种技术有效地抑制模式竞争,提高信号质量和稳定性.
- 在安全通信和雷达系统中的先进应用.
更多相关视频
相关概念视频
Time and frequency -Domain Interpretation of Phase-lag Control
148
Phase-lag controllers are widely used in control systems to improve stability and reduce steady-state errors. A dimmer switch controlling the brightness of a light bulb serves as a practical example of phase-lag control, gradually adjusting the bulb's brightness. Mathematically, phase-lag control or low-pass filtering is represented when the factor 'a' is less than 1.
Phase-lag controllers do not place a pole at zero, but instead influence the steady-state error by amplifying any...
Phase-lag controllers do not place a pole at zero, but instead influence the steady-state error by amplifying any...
148
Oscillations In An LC Circuit
2.5K
An idealized LC circuit of zero resistance can oscillate without any source of emf by shifting the energy stored in the circuit between the electric and magnetic fields. In such an LC circuit, if the capacitor contains a charge q before the switch is closed, then all the energy of the circuit is initially stored in the electric field of the capacitor. This energy is given by
2.5K
Time and frequency -Domain Interpretation of Phase-lead Control
136
Phase-lead controllers are commonly used in various control systems to enhance response speed and stability. Adjusting the brightness on a television screen offers a practical example of phase-lead control. When contrast is enhanced, a phase-lead controller is employed. Mathematically, phase-lead control is identified when the first parameter is smaller than the second.
The design of phase-lead control involves the strategic placement of poles and zeros to balance steady-state error and system...
The design of phase-lead control involves the strategic placement of poles and zeros to balance steady-state error and system...
136
Generating Electromagnetic Radiations
3.9K
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...
3.9K
RLC Circuit as a Damped Oscillator
1.3K
An RLC circuit combines a resistor, inductor, and capacitor, connected in a series or parallel combination.
Consider a series RLC circuit. Here, the presence of resistance in the circuit leads to energy loss due to joule heating in the resistance. Therefore, the total electromagnetic energy in the circuit is no longer constant and decreases with time. Since the magnitude of charge, current, and potential difference continuously decreases, their oscillations are said to be damped. This is...
Consider a series RLC circuit. Here, the presence of resistance in the circuit leads to energy loss due to joule heating in the resistance. Therefore, the total electromagnetic energy in the circuit is no longer constant and decreases with time. Since the magnitude of charge, current, and potential difference continuously decreases, their oscillations are said to be damped. This is...
1.3K
Propagation Speed of Electromagnetic Waves
3.9K
Electromagnetic waves are consistent with Ampere's law. Assuming there is no conduction current Ampere's law is given as:
3.9K

