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Low-cost and efficient coupling technique using reflowed sol-gel microlens.

M He, X-C Yuan, N Ngo

    Optics Express
    |May 26, 2009
    PubMed
    Summary

    A new reflow technique fabricates elliptical microlens arrays in sol-gel glass, enabling efficient laser diode to single-mode fiber coupling with relaxed alignment tolerances.

    Area of Science:

    • Optics and Photonics
    • Materials Science

    Background:

    • Microlens arrays are crucial for optical coupling applications.
    • Existing fabrication methods face challenges in achieving desired surface smoothness and dimensional accuracy.

    Purpose of the Study:

    • To introduce a novel reflow technique for fabricating elliptical microlens arrays.
    • To evaluate the performance of these microlenses in laser diode to single-mode fiber coupling.

    Main Methods:

    • Fabrication of elliptical microlens arrays using a sol-gel glass reflow technique.
    • Characterization of surface smoothness and dimensional conformity.
    • Measurement of coupling efficiency and misalignment tolerances for laser diode to single-mode fiber coupling.

    Main Results:

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    • The reflow technique produced microlens arrays with excellent surface smoothness and conformity to design parameters.
    • High coupling efficiency was achieved between a laser diode and a single-mode fiber.
    • The microlens array significantly relaxed lateral and axial misalignment tolerances.

    Conclusions:

    • The novel reflow technique offers a viable method for fabricating high-performance microlens arrays.
    • This technique facilitates efficient optical coupling with improved tolerance, reducing system complexity and cost.