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Spectral splicing for an OFDR sensing system using a DBR laser.

Yuanze Xue, Xuefeng Wang, Caijie Tang

    Applied Optics
    |October 18, 2022
    PubMed
    Summary
    This summary is machine-generated.

    This study introduces a novel spectral splicing method for optical frequency domain reflectometry (OFDR) sensing systems, utilizing a distributed Bragg reflector (DBR) laser. This technique enables high-resolution fiber optic strain sensing over extended ranges.

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    Area of Science:

    • Optical Engineering
    • Sensing Technology
    • Fiber Optics

    Background:

    • Conventional optical frequency domain reflectometry (OFDR) systems typically employ external cavity tunable lasers (ECTLs).
    • Distributed Bragg reflector (DBR) lasers offer advantages like small size, low cost, and integration but suffer from limited continuous tuning ranges due to mode hopping.

    Purpose of the Study:

    • To propose and demonstrate a spectral splicing method for OFDR systems using a DBR laser as the light source.
    • To overcome the wavelength tuning limitations of DBR lasers for enhanced sensing applications.
    • To achieve high-resolution distributed optical fiber strain sensing.

    Main Methods:

    • Development of a spectral splicing technique to combine multiple, partially overlapping Rayleigh scattering signals.
    • Utilized a distributed Bragg reflector (DBR) laser, overcoming its inherent 1 nm continuous tuning limitation.
    • Spliced 39 Rayleigh scattering signals to achieve a continuous wavelength range of 35.174 nm.

    Main Results:

    • Successfully realized distributed optical fiber strain sensing with a high spatial resolution of 5 mm.
    • Achieved a strain measurement range of ±2500 µε.
    • The maximum error in measured strain was determined to be 9.91 µε.

    Conclusions:

    • The proposed spectral splicing method effectively extends the usable wavelength range of DBR lasers in OFDR systems.
    • This approach enables cost-effective, high-resolution, and long-range fiber optic strain sensing.
    • The DBR laser, combined with spectral splicing, presents a viable alternative to ECTLs for OFDR sensing.