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Related Concept Videos

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:

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Microwave Photonics Systems Based on Whispering-gallery-mode Resonators
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Extremely small multimode-interference coupled triangular resonator with sharp angle of incidence.

Doo Gun Kim1, Geum-Yoon Oh, Woon-Kyung Choi

  • 1Microwave and Lightwave Telecommunications Lab., School of Electrical and Electronics Engineering, Chung-Ang University, Dongjak-ku, Seoul, 156-756, Korea.

Optics Express
|December 10, 2008
PubMed
Summary
This summary is machine-generated.

Researchers developed novel triangular ring resonators using compact multimode-interference couplers and total internal reflection mirrors. These compact optical devices offer high integration potential for future wavelength division multiplexing systems.

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Area of Science:

  • Photonics and Optical Engineering
  • Integrated Optics

Background:

  • Optical resonators are key components in photonic integrated circuits.
  • Miniaturization and high integration density are crucial for advanced optical systems.
  • Semiconductor optical amplifiers are essential for signal gain in integrated photonic devices.

Purpose of the Study:

  • To report novel triangular ring resonators for the first time.
  • To demonstrate compact size and high integration potential.
  • To integrate multimode-interference (MMI) couplers, total internal reflection (TIR) mirrors, and semiconductor optical amplifiers.

Main Methods:

  • Fabrication of triangular ring resonators with integrated MMI couplers and TIR mirrors.
  • Utilizing semiconductor optical amplifiers within the resonator structure.
  • Characterization of resonator performance near 1550 nm.

Main Results:

  • Achieved an extremely short MMI coupler length of 90 micrometers.
  • Observed a free-spectral range of approximately 2 nm.
  • Demonstrated an on-off ratio of 17 dB.
  • TIR mirror incidence angle of 22 degrees.

Conclusions:

  • The novel triangular resonators offer a compact footprint and high integration capability.
  • These resonators are promising for increasing functionality in optical wavelength division multiplexing systems.
  • Potential for large-scale integration on a single chip.