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Improved wavelength coded optical time domain reflectometry based on the optical switch.

Ninghua Zhu, Youwan Tong, Wei Chen

    Optics Express
    |July 1, 2014
    PubMed
    Summary

    This study enhances wavelength coded time-domain reflectometry using an optical switch for improved signal-noise-ratio. The new system achieves precise fiber break detection and monitoring in wavelength-division-multiplexing passive optical networks.

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    Area of Science:

    • Optoelectronics
    • Optical sensing
    • Fiber optic communication

    Background:

    • Accurate fiber break detection is crucial for reliable optical communication networks.
    • Traditional reflectometry methods can suffer from limited signal-noise-ratio (SNR) and spatial resolution.
    • Wavelength-division-multiplexing passive optical networks (WDM-PONs) require robust monitoring systems.

    Purpose of the Study:

    • To improve the signal-noise-ratio (SNR) of beat signals in wavelength coded time-domain reflectometry.
    • To enhance the spatial resolution and detection range for fiber break identification.
    • To develop a monitoring system for WDM-PONs capable of detecting fiber breaks across multiple channels.

    Main Methods:

    • Implementation of a 2 × 1 optical switch to generate wavelength-stable, low-noise optical pulses for probe and reference signals.

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  • Experimental setup to evaluate the system's performance in terms of spatial resolution and beat signal linewidth.
  • Construction of a WDM-PON monitoring system utilizing a distributed Bragg reflector (DBR) laser with tunable current for channel-specific detection.

    • Main Results:

    • Achieved a spatial resolution of 2.5m over a 70km range.
    • Obtained a beat signal with a linewidth narrower than 15 MHz within a 50km range for fiber break detection.
    • Successfully demonstrated fiber break detection across different channels in a WDM-PON by tuning the DBR laser.

    Conclusions:

    • The improved wavelength coded time-domain reflectometry system offers enhanced performance for fiber optic sensing.
    • The system provides a practical solution for high-resolution, long-range fiber break detection.
    • The developed WDM-PON monitoring system is effective for identifying faults in multi-channel optical networks.