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Related Concept Videos

Characteristics of Series Resonant Circuit01:24

Characteristics of Series Resonant Circuit

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:
Sound Waves: Resonance01:14

Sound Waves: Resonance

Resonance is produced depending on the boundary conditions imposed on a wave. Resonance can be produced in a string under tension with symmetrical boundary conditions (i.e., has a node at each end). A node is defined as a fixed point where the string does not move. The symmetrical boundary conditions result in some frequencies resonating and producing standing waves, while other frequencies interfere destructively. Sound waves can resonate in a hollow tube, and the frequencies of the sound...
Parallel Resonance01:23

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:
¹H NMR: Interpreting Distorted and Overlapping Signals01:02

¹H NMR: Interpreting Distorted and Overlapping Signals

Spin systems where the difference in chemical shifts of the coupled nuclei is greater than ten times J are called first-order spin systems. These nuclei are weakly coupled, and their chemical shifts and coupling constant can generally be estimated from the well-separated signals in the spectrum.
As Δν decreases and the signals move closer, the doublets appear increasingly distorted. The intensities of the inner lines increase at the cost of those of the outer lines as the signals are slanted or...
Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
Spin decoupling is usually achieved by...
Concept of Resonance and its Characteristics01:19

Concept of Resonance and its Characteristics

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 immune...

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Microwave Photonics Systems Based on Whispering-gallery-mode Resonators
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Ultra-high order ring resonator system with sharp transmission peaks.

S H Tao1, S C Mao, J F Song

  • 1School of Physical Science and Technology, Central South University, China.

Optics Express
|February 23, 2010
PubMed
Summary
This summary is machine-generated.

Researchers developed a novel relay ring resonator structure using cascaded microring resonators. This design achieves sharp transmission peaks, high rejection ratios, and extended group delays for optical signal processing.

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Area of Science:

  • Photonics
  • Optical Engineering
  • Materials Science

Background:

  • Microring resonators are fundamental components in integrated photonics.
  • Cascading resonators can enhance optical filter characteristics.
  • Achieving sharp spectral features and high rejection ratios is crucial for advanced optical systems.

Purpose of the Study:

  • To propose and demonstrate a novel relay ring resonator structure.
  • To investigate the transmission response, including peak sharpness, out-of-band rejection, and group delay.
  • To fabricate and validate the proposed structure using silicon nitride waveguides.

Main Methods:

  • Designing a relay ring resonator structure with cascaded microring resonators.
  • Utilizing the drop waveguide of one resonator as the input for the next.
  • Fabricating a 90-microring resonator structure on silicon nitride wire waveguides.
  • Conducting simulations and experimental measurements to verify performance.

Main Results:

  • The proposed relay ring resonator structure exhibits sharp transmission peaks.
  • High out-of-band rejection ratios were achieved.
  • Long group delays were observed in the transmission response.
  • Simulation and experimental results showed good agreement.

Conclusions:

  • The relay ring resonator structure is an effective design for enhancing optical filter performance.
  • This structure offers significant improvements in spectral sharpness and rejection.
  • The demonstrated silicon nitride fabrication validates the potential for practical applications in integrated photonics.