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Related Experiment Video

Updated: Jun 22, 2026

The Frequency Domain Thermoreflectance Technique for Thermal Property Measurements
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Published on: December 5, 2025

Normalization detection scheme for high-speed optical frequency-domain imaging and reflectometry.

Sucbei Moon, Dug Young Kim

    Optics Express
    |June 25, 2009
    PubMed
    Summary
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    Funnel Devices Based on Asymmetrically Strained Transition Metal Dichalcogenides.

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    We developed a novel signal detection method to suppress relative intensity noise (RIN) in optical frequency-domain reflectometry/imaging (OFDR/OFDI). This technique significantly enhances sensitivity and dynamic range by digitally normalizing spectral interferograms.

    Area of Science:

    • Optical Engineering
    • Signal Processing
    • Metrology

    Background:

    • Relative Intensity Noise (RIN) in frequency-swept sources degrades sensitivity and dynamic range in optical frequency-domain reflectometry/imaging (OFDR/OFDI).
    • Conventional balanced detection methods effectively suppress additive intensity noise but struggle with convolutional noise contributions from RIN.
    • High RIN from supercontinuum sources poses a significant challenge in applications like stretched-pulse optical coherence tomography (SP-OCT).

    Purpose of the Study:

    • To introduce and validate a new digital signal detection method for OFDR/OFDI systems.
    • To effectively suppress both additive and convolutional noise components originating from RIN.
    • To improve the sensitivity and dynamic range of OFDR/OFDI systems, particularly in challenging environments.

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    Main Methods:

    • A novel digital normalization technique using a spectral reference signal containing real-time spectrum and RIN information.
    • Application of the method to a stretched-pulse optical coherence tomography (SP-OCT) system.
    • Comparative analysis against the conventional balanced detection method.

    Main Results:

    • The proposed method successfully suppressed both additive and convolutional RIN contributions in the interferogram signal.
    • Experimental results demonstrated a superior dynamic range compared to the balanced detection method in an SP-OCT system.
    • The noise suppression performance was found to be independent of spectral imbalance in optical components.

    Conclusions:

    • The developed digital signal detection method offers a robust solution for mitigating RIN in OFDR/OFDI.
    • This technique significantly enhances system performance, enabling higher sensitivity and dynamic range.
    • The method's immunity to spectral imbalance provides an advantage over conventional balanced detection.