相关实验视频
Updated: Aug 1, 2026

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Generation and Coherent Control of Pulsed Quantum Frequency Combs
Published on: June 8, 2018
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概括
一个新的宽带光电融合收发器系统使得高效的频率转换成为可能. 该系统提高了频谱利用率,并通过使用双频转换和多重组件减少了复杂性,以实现高虚假抑制.
科学领域:
- 微波光子学 微波光子学
- 信号处理 信号处理
- 光学通信系统 光学通信系统
背景情况:
- 传统的频率转换器面临复杂性和频谱利用方面的挑战.
- 集成微波和光子技术为增强系统性能提供了潜力.
- 宽带收发器系统对于现代无线通信至关重要.
研究的目的:
- 提出和演示用于频率转换的宽带光电融合收发器多重复合系统.
- 为了实现高虚假抑制和有效的频谱利用.
- 通过利用微波和光子技术的优势来降低系统复杂性.
主要方法:
- 开发一个采用光电聚变的收发器多重复合系统.
- 实现采用马赫-泽恩德调制器 (MZM) 复合的双频转换.
- 使用高频局部振荡器 (LO) 信号来减轻虚假信号.
主要成果:
- 在2-18 GHz频率范围内经过证明的操作,具有高的发射器和接收器性能.
- 在上转换时达到57.35dB的图像拒绝,在下转换时达到46.56dB.
- 获得了至少55.02 dB的带内虚假抑制和89.11 dB·Hz^{2/3}的无虚假动态范围 (SFDR).
结论:
- 拟议的光电聚变收发器系统有效实现了性能增强的频率转换器.
- 该系统在虚假抑制和频谱利用方面取得了显著的改进.
- 这种方法为复杂的宽带收发器应用提供了可行的解决方案.
相关概念视频
Cascaded Op Amps
Operational amplifiers (op-amps) are versatile electronic components that can be interconnected in a cascade - one after another in a linear sequence. This cascading is possible due to their infinite input resistance and zero output resistance, allowing them to maintain their input-output relationships even when connected in series.
In a cascaded system, each op-amp is referred to as a stage. The output of one stage drives the input of the subsequent stage. As the input signal passes through...
In a cascaded system, each op-amp is referred to as a stage. The output of one stage drives the input of the subsequent stage. As the input signal passes through...
Parallel Resonance
The parallel RLC circuit is an arrangement where the resistor (R), inductor (L), and capacitor (C) are all connected to the same nodes and, as a result, share the same voltage across them. The parallel RLC circuit is analyzed in terms of admittance (Y), which reflects the ease with which current can flow. The admittance is given by:
Carrier Generation and Recombination
Carrier generation is the process by which electron-hole pairs (EHPs) are created within the semiconductor. In direct-bandgap semiconductors, such as gallium arsenide (GaAs), this occurs efficiently when energy absorption prompts valence electrons to leap into the conduction band, leaving behind holes.
This process is given by the generation rate G and is efficient due to the conservation of momentum between the valence band maximum and conduction band minimum.
Indirect generation involves an...
This process is given by the generation rate G and is efficient due to the conservation of momentum between the valence band maximum and conduction band minimum.
Indirect generation involves an...
Design Example: Capacitance Multiplier Circuit
In integrated circuit technology, a capacitance multiplier is often utilized to produce a larger capacitance value when a small physical capacitance falls short. This is achieved by a circuit that multiplies capacitance values by a factor of up to 1000, such that a 10-pF capacitor can replicate the performance of a 100-nF capacitor.
The circuit illustrated in Figure 1 below incorporates two op-amps, with the first operating as a voltage follower and the second acting as an inverting amplifier.
The circuit illustrated in Figure 1 below incorporates two op-amps, with the first operating as a voltage follower and the second acting as an inverting amplifier.

