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Related Concept Videos

Standing Waves in a Cavity01:28

Standing Waves in a Cavity

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A household microwave and lasers are examples of standing electromagnetic waves in a cavity. When two conducting metal plates are placed parallel at the nodal planes, it creates a cavity where standing waves are formed. The cavity between the two planes is analogous to a stretched string held at the points x = 0 and x = L. Here, the distance 'L' between the two planes must be an integer multiple of half of the wavelength. The wavelengths that satisfy this condition are given by:
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Updated: Aug 25, 2025

Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source
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Microwave frequency measurement using a silicon integrated microring resonator.

Ruidong Cao, Yuting He, Ruiqi Zheng

    Applied Optics
    |October 18, 2022
    PubMed
    Summary

    We demonstrate a new method for instantaneous microwave frequency measurement using silicon microring resonators. This photonics-assisted approach offers a compact and accurate solution for high-frequency signal analysis.

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    Area of Science:

    • Photonics
    • Microwave Engineering
    • Integrated Optics

    Background:

    • Accurate instantaneous frequency measurement (IFM) is crucial for advanced communication and radar systems.
    • Traditional IFM techniques often face limitations in terms of size, bandwidth, and accuracy.
    • Silicon photonics offers a promising platform for miniaturized and high-performance photonic devices.

    Purpose of the Study:

    • To propose and experimentally demonstrate a novel photonics-assisted IFM technique.
    • To utilize a silicon integrated microring resonator (MRR) as the core component for frequency discrimination.
    • To achieve a wide measurement range and high accuracy for microwave signals.

    Main Methods:

    • Designing and fabricating a silicon integrated microring resonator (MRR).
    • Employing the MRR to create two microwave photonic filters (MPFs) with complementary frequency responses.
    • Converting a phase-modulated optical signal to an intensity-modulated optical signal using the MRR's complementary slopes.
    • Relating the microwave signal's frequency to the power ratio at the MPF outputs for instantaneous measurement.

    Main Results:

    • The fabricated silicon integrated MRR successfully implemented the MPFs.
    • An instantaneous microwave frequency (IMF) measurement range of 14-25 GHz was achieved.
    • A high measurement accuracy of ±0.2 GHz was demonstrated for the fabricated device.

    Conclusions:

    • Photonics-assisted IFM using silicon integrated MRRs is a viable and effective technique.
    • The demonstrated method offers a compact, accurate, and wide-range solution for microwave frequency measurement.
    • This technology has potential applications in advanced wireless communication, radar, and electronic warfare systems.