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Related Concept Videos

Parallel Resonance01:23

Parallel Resonance

188
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:
188
Series Resonance01:17

Series Resonance

152
The RLC circuit impedance is defined as the ratio of the supply voltage to the circuit current. Resonance in such a circuit occurs when the imaginary part of this impedance equals zero. This specific condition means that the inductive reactance is exactly equal to the capacitive reactance. The frequency at which this happens is known as the resonant frequency. Mathematically, the resonant frequency is inversely proportional to the square root of the product of the inductance (L) and capacitance...
152
Characteristics of Series Resonant Circuit01:24

Characteristics of Series Resonant Circuit

230
Series resonance occurs in a circuit containing inductive (L), capacitive (C), and resistive (R) elements connected sequentially. At the resonance frequency, the inductive and capacitive reactances are equal in magnitude but opposite in sign, effectively canceling each other. This causes the circuit's impedance is minimal, primarily determined by the resistance R. The resonant frequency of an RLC circuit is defined as:
230
Design Example: Underdamped Parallel RLC Circuit01:17

Design Example: Underdamped Parallel RLC Circuit

270
Consider designing an oscillator circuit, a crucial component in various electronic devices and systems. The objective is to create an oscillator circuit with specific characteristics: a damped natural frequency of 4 kHz and a damping factor of 4 radians per second. To accomplish this, a parallel RLC circuit is employed, known for its ability to sustain oscillations at a resonant frequency. In this case, the damping factor is pivotal in achieving the desired performance.
Starting with a fixed...
270
Resonance in an AC Circuit01:26

Resonance in an AC Circuit

2.0K
The property of an inductor makes it resist any change in the current passing through it, while the property of a capacitor is to build up the charge across its terminals. Hence, if an inductor and capacitor are connected in series, they have opposite effects on the relative phase between current and voltage. The current through the circuit undergoes forced oscillation at the frequency of the source. The resistance term in an R-L-C circuit acts as a damping term because power is dissipated...
2.0K
Concept of Resonance and its Characteristics01:19

Concept of Resonance and its Characteristics

5.0K
If a driven oscillator needs to resonate at a specific frequency, then very light damping is required. An example of light damping includes playing piano strings and many other musical instruments. Conversely, to achieve small-amplitude oscillations as in a car's suspension system, heavy damping is required. Heavy damping reduces the amplitude, but the tradeoff is that the system responds at more frequencies. Speed bumps and gravel roads prove that even a car's suspension system is not...
5.0K

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Updated: Jun 10, 2025

Microwave Photonics Systems Based on Whispering-gallery-mode Resonators
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Microwave Photonics Systems Based on Whispering-gallery-mode Resonators

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Efficient microresonator frequency combs.

Qi-Fan Yang1, Yaowen Hu1,2, Victor Torres-Company3

  • 1State Key Laboratory for Artificial Microstructure and Mesoscopic Physics and Frontiers Science Center for Nano-optoelectronics, School of Physics, Peking University, Beijing, China.

Elight
|October 17, 2024
PubMed
Summary
This summary is machine-generated.

Chip-scale optical frequency combs (microcombs) now offer high efficiency, exceeding 50% energy conversion. Advances in microresonator nonlinear optics and ultralow-loss photonic circuits enable powerful comb functionalities beyond the lab.

Keywords:
Nonlinear photonicsOptical frequency combOptical microresonator

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Area of Science:

  • Photonics and Optical Engineering
  • Nonlinear Optics
  • Integrated Photonics

Background:

  • Optical frequency combs have transitioned from laboratory setups to chip-scale platforms.
  • Microresonators are key for generating combs with advantages in size, weight, and power.
  • Understanding gain/loss dynamics and ultralow-loss circuits are crucial for efficiency.

Purpose of the Study:

  • To review recent advancements in microcomb efficiency.
  • To highlight novel photonic devices and pumping strategies.
  • To discuss the integration of microcombs into practical applications.

Main Methods:

  • Summarizing progress in nonlinear microresonator optics.
  • Analyzing developments in ultralow-loss photonic circuitry.
  • Reviewing new pumping techniques for comb generation.

Main Results:

  • Microcomb energy conversion efficiency has surpassed 50%.
  • Significant improvements stem from enhanced nonlinear processes and optimized photonic circuits.
  • These advancements pave the way for practical, high-performance comb applications.

Conclusions:

  • Microcomb technology has achieved major efficiency milestones.
  • Further integration of comb functionalities is enabled by these developments.
  • Remaining challenges in the field are identified for future research.