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Self-detecting optical-time-domain reflectometer for single-mode fibers.

M Nakazawa, T Nakashima, S Seikai

    Optics Letters
    |September 3, 2009
    PubMed
    Summary

    A novel optical-time-domain reflectometer (OTDR) utilizes a semiconductor laser diode (LD) for both emitting pulses and detecting signals. This innovative approach achieved fault location up to 25 km in single-mode optical fibers.

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    Area of Science:

    • Optical Engineering
    • Photonics
    • Telecommunications

    Background:

    • Optical-time-domain reflectometry (OTDR) is crucial for fiber optic network testing.
    • Traditional OTDRs often require separate components for pulse emission and signal detection.
    • Improving the reach and efficiency of OTDR systems is an ongoing challenge.

    Purpose of the Study:

    • To demonstrate a new type of OTDR using a single semiconductor laser diode (LD) for both pulse emission and photodetection.
    • To evaluate the fault-location performance of this integrated LD-based OTDR.
    • To investigate the wavelength and polarization characteristics of the LD when used as a photodetector.

    Main Methods:

    • A semiconductor laser diode (LD) was employed as both the pulse emitter and the photodetector.

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  • Measurements were conducted at wavelengths of 1.31 microm and 1.56 microm.
  • The log-transformed OTDR slope was extrapolated to the background-noise level to determine fault-location length.
  • Wavelength and polarization dependences of the LD's photodetector performance were analyzed.

    • Main Results:

    • A fault-location length of approximately 20 km was achieved at 1.31 microm.
    • The fault-location length was extended to 25 km at 1.56 microm.
    • No polarization dependence was observed for the LD operating as a photodetector.

    Conclusions:

    • A single semiconductor laser diode can effectively function as both a pulse emitter and a photodetector in an OTDR system.
    • The integrated LD-based OTDR demonstrates promising performance for fault location in single-mode optical fibers.
    • The system's performance is wavelength-dependent, with extended reach at longer wavelengths, and shows no polarization sensitivity.