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Related Experiment Video

Updated: Apr 30, 2026

Low-cost Custom Fabrication and Mode-locked Operation of an All-normal-dispersion Femtosecond Fiber Laser for Multiphoton Microscopy
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A 10 × 10 Gb/s DFB laser diode array fabricated using a SAG technique.

Oh Kee Kwon, Yong Ahn Leem, Young Tak Han

    Optics Express
    |May 3, 2014
    PubMed
    Summary

    We developed a ten-channel distributed feedback laser diode array (DFB-LDA) for 100 Gb/s optical data transmission. This DFB-LDA offers precise wavelength control and high performance for advanced communication systems.

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    Area of Science:

    • Photonics and Optical Engineering
    • Semiconductor Device Physics
    • Telecommunications Technology

    Background:

    • High-speed optical communication systems require advanced laser sources.
    • Distributed feedback laser diode arrays (DFB-LDAs) are crucial for wavelength division multiplexing (WDM).
    • Accurate wavelength control and high performance are essential for dense WDM applications.

    Purpose of the Study:

    • To present a novel ten-channel DFB-LDA for 100 Gb/s optical signal transmission.
    • To demonstrate the effectiveness of specific fabrication techniques for tailored laser performance.
    • To evaluate the operational performance of the DFB-LDA through a comprehensive sub-assembly module.

    Main Methods:

    • Fabrication using selective area growth (SAG), electron-beam lithography, and reverse-mesa ridge waveguide LD processing.

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  • Development of a sub-assembly module including the DFB-LDA, resistors, FPCB, and thermistor.
  • Systematic evaluation of static and dynamic properties of all ten laser channels.

    • Main Results:

    • Achieved accurate lasing-wavelength control and excellent single-mode yield across all channels.
    • Demonstrated a side-mode suppression ratio (SMSR) greater than 50 dB.
    • Observed a modulation bandwidth exceeding 10 GHz and clear eye-opening after 2-km transmission.

    Conclusions:

    • The developed ten-channel DFB-LDA enables high-capacity optical data transmission.
    • The fabrication techniques ensure precise wavelength control and high performance.
    • The sub-assembly module facilitates robust evaluation and application of the DFB-LDA.