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    This study presents a simplified, cost-effective optical frequency domain reflectometry (OFDR) system using semiconductor lasers. The innovative design eliminates the need for an auxiliary interferometer, enhancing accuracy and reducing complexity for fiber optic sensing applications.

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    Area of Science:

    • Photonics and Optical Sensing
    • Semiconductor Laser Technology
    • Fiber Optic Measurement Systems

    Background:

    • Traditional optical frequency domain reflectometry (OFDR) systems often require auxiliary interferometers.
    • External interferometers in conventional OFDR setups can introduce noise, degrading measurement performance.
    • Existing OFDR designs can be complex and costly due to multiple optical components.

    Purpose of the Study:

    • To develop an integrated, accurate, and inexpensive semiconductor laser-based OFDR system.
    • To eliminate the need for an auxiliary interferometer in OFDR systems.
    • To enhance the cost-effectiveness and reduce the complexity of OFDR setups.

    Main Methods:

    • Utilizing the fiber under test for both sensing and frequency sweep linearization.
    • Implementing a single optical interferometer design.
    • Leveraging semiconductor laser technology for precise frequency sweeps.

    Main Results:

    • The proposed system successfully mitigates and compensates for phase errors without an auxiliary interferometer.
    • Experimental results show enhanced performance compared to traditional OFDR methods.
    • The compact design achieves minimal OFDR system complexity with only one interferometer.

    Conclusions:

    • The integrated semiconductor laser-based OFDR system offers improved accuracy and cost-effectiveness.
    • The simplified design reduces complexity and enhances overall performance in fiber optic sensing.
    • This approach represents a significant advancement in practical OFDR implementation.