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Related Experiment Video

Updated: Jun 3, 2026

Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping
09:43

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Published on: March 20, 2017

High-accuracy multi-channel optical transfer delay measurement using time-gated phase-based ranging.

Ting Qing, Shupeng Li, Zongxin Xu

    Optics Letters
    |June 1, 2026
    PubMed
    Summary

    This study introduces a novel parallel technique for measuring optical transfer delay (OTD) across multiple channels, achieving high accuracy and efficiency for optical systems. The method enables simultaneous measurement of 8 channels with ±0.25 µps precision.

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    Last Updated: Jun 3, 2026

    Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping
    09:43

    Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping

    Published on: March 20, 2017

    A Protocol for Real-time 3D Single Particle Tracking
    10:16

    A Protocol for Real-time 3D Single Particle Tracking

    Published on: January 3, 2018

    Area of Science:

    • Photonics and Optical Engineering
    • Telecommunications Systems

    Background:

    • Accurate optical transfer delay (OTD) measurement is vital for optical phased array antennas, fiber-optic sensors, and multichannel optical communications.
    • Conventional methods for OTD measurement are often single-channel, requiring sequential switching for multi-channel analysis, leading to inefficiency.

    Purpose of the Study:

    • To develop and demonstrate a high-accuracy, parallel multi-channel OTD measurement technique.
    • To overcome the limitations of sequential single-channel measurements in complex optical systems.

    Main Methods:

    • Utilized time-gated phase-based ranging for OTD measurement.
    • Employed Wavelength Division Multiplexing (WDM) to assign unique wavelengths to probe signals for each channel, enabling parallel excitation and single-receiver detection.
    • Separated overlapping channel responses in the time domain and retrieved phase response via time-domain gating and frequency-domain processing.

    Main Results:

    • Successfully demonstrated simultaneous parallel measurement of 8 channels.
    • Achieved a measurement precision of ±0.25 µps.
    • Validated the technique's ability to extract delay through the linear slope of the unwrapped phase.

    Conclusions:

    • The proposed technique offers a simple architecture, high precision, and multi-channel scalability for OTD measurement.
    • Provides an efficient solution for characterizing complex optical networks and multi-core fiber systems.
    • Enables parallel, high-accuracy OTD measurements, improving efficiency over sequential methods.