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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:
Resonance in an AC Circuit01:26

Resonance in an AC Circuit

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...
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...
Series Resonance01:17

Series Resonance

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...

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Fabrication and Characterization of High-Q Silicon Nitride Membrane Resonators
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Resilience in optical ring-resonant switches.

Kevin A Williams1, Abhinav Rohit, Madeleine Glick

  • 1Technische Universiteit Eindhoven, COBRA Research Institute, Eindhoven, The Netherlands. k.a.williams@tue.nl

Optics Express
|September 22, 2011
PubMed
Summary

Phase-modulated ring resonant switches offer robust performance in silicon photonic networks. Optimized designs allow relaxed fabrication tolerances, enabling high-speed optical signal routing with excellent extinction ratios.

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Area of Science:

  • Photonics
  • Optical Engineering
  • Materials Science

Background:

  • Silicon photonic networks are crucial for high-bandwidth communication.
  • Phase-modulated ring resonant switches are key components.
  • Fabrication variations pose challenges to performance.

Purpose of the Study:

  • To analyze the impact of fabrication variations on optical switch performance.
  • To identify design strategies for improved resilience and performance.
  • To predict the performance of optimized optical switches.

Main Methods:

  • Vectorial optical-mode propagation simulations.
  • Transfer matrix calculations.
  • Mapping feature size variations to performance metrics (extinction ratio, bandwidth, power penalty).

Main Results:

  • Relaxed fabrication tolerances are achievable with specific design choices.
  • Moderate directional couplers (up to 30 µm) and free spectral range (400 GHz) are effective.
  • Fifth-order resonance enhances performance.

Conclusions:

  • Optimized phase-modulated ring resonant switches can achieve high-speed (10 Gb/s) routing.
  • Predicted performance includes low on-state power penalties (0.2-0.7 dB).
  • Exceptional off-state extinctions (-62 dB) are feasible, meeting wavelength-multiplex standards.