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Characteristics of Series Resonant Circuit01:24

Characteristics of Series Resonant Circuit

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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:
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High Q-factor microring resonator wrapped by the curved waveguide.

Dong-Po Cai1, Jyun-Hong Lu1, Chii-Chang Chen1

  • 1Department of Optics and Photonics, National Central University, 32001 Jhongli, Taiwan.

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|May 21, 2015
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Summary

This study reduces microring resonator bending loss using a novel concentric waveguide design. This method optimizes critical coupling and achieves a high quality factor of 7 × 10^5 for improved optical performance.

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Area of Science:

  • Photonics
  • Optical Engineering
  • Materials Science

Background:

  • Ring resonators are crucial optical components, but their performance is limited by bending loss and critical coupling conditions.
  • Minimizing bending loss and controlling critical coupling are essential for enhancing the quality factor (Q-factor) of microring resonators.

Purpose of the Study:

  • To investigate and improve the performance of various ring resonators by analyzing bending loss and critical coupling.
  • To propose and validate a novel method for reducing bending loss in microring resonators.

Main Methods:

  • Analyzing bending loss and critical coupling conditions in different types of ring resonators.
  • Implementing a design with a concentrically curved waveguide wrapped around the microring.
  • Tuning the bus waveguide width to adjust the propagation constant difference for optimized critical coupling.

Main Results:

  • Demonstrated a reduction in bending loss by wrapping the microring with a concentrically curved waveguide.
  • Achieved optimized critical coupling by adjusting the bus waveguide width.
  • Attained the highest measured quality factor of 7 × 10^5 by enlarging the propagation constant difference.

Conclusions:

  • The proposed concentric waveguide wrapping effectively reduces bending loss in microring resonators.
  • The ability to tune propagation constant differences allows for precise control over critical coupling.
  • This approach significantly enhances the quality factor, paving the way for more efficient optical devices.