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Athermal operation of multi-section slotted tunable lasers.

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    |August 10, 2017
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    Researchers demonstrate athermal bias current procedures for a low-cost, three-section slotted laser. This cost-effective device achieves stable, mode-hop-free operation within dense wavelength division multiplexing (DWDM) system specifications.

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    Area of Science:

    • Photonics
    • Semiconductor Lasers
    • Optical Communications

    Background:

    • Athermal laser operation is crucial for stable performance in optical communication systems.
    • Traditional methods for achieving athermal laser performance often involve complex and costly designs.
    • Three-section slotted lasers offer a potentially lower-cost alternative but require specific strategies for thermal stability.

    Purpose of the Study:

    • To demonstrate athermal bias current procedures for a monolithic, three-section slotted single mode laser.
    • To achieve mode-hop-free wavelength stability over a specified temperature range.
    • To evaluate the potential of this cost-effective laser design for dense wavelength division multiplexing (DWDM) systems.

    Main Methods:

    • Development and application of two distinct athermal bias current procedures.
    • Utilizing thermal tuning for wavelength stabilization.
    • Employing an analytical model and thermoreflectance measurements for operational insight.

    Main Results:

    • Achieved mode-hop-free wavelength stability of ± 0.04 nm / 5 GHz over a temperature range of 8-47 °C.
    • Demonstrated athermal performance in a simple-fabrication, three-section slotted laser for the first time.
    • Performance is comparable to more complex distributed-Bragg-reflector (DBR) lasers.

    Conclusions:

    • Strong athermal performance is achievable with lower-cost three-section slotted lasers.
    • The demonstrated performance meets the stringent requirements for DWDM systems.
    • The developed analytical model and measurements provide a foundation for optimizing athermal laser designs.