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Wavelength-division-multiplexing and -demultiplexing by using a substratemode grating pair.

Y T Huang, D C Su, Y K Tsai

    Optics Letters
    |October 3, 2009
    PubMed
    Summary
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    Researchers developed a new grating pair for wavelength-division multiplexing/demultiplexing. This device offers easier fiber alignment and achieved over 85% efficiency in experiments.

    Area of Science:

    • Optics and Photonics
    • Holography
    • Integrated Optics

    Background:

    • Wavelength-division multiplexing (WDM) is crucial for increasing optical communication capacity.
    • Existing WDM devices can be complex to align and may suffer from polarization sensitivity.
    • Substrate-mode holographic elements offer a compact and potentially efficient solution.

    Purpose of the Study:

    • To investigate a novel substrate-mode grating pair for WDM applications.
    • To demonstrate the feasibility of polarization-insensitive, high-efficiency WDM devices.
    • To facilitate easier optical fiber alignment through normally incident coupling and on-axis output.

    Main Methods:

    • Theoretical modeling of the substrate-mode grating pair.
    • Fabrication of polarization-insensitive substrate-mode holograms.

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  • Experimental demonstration of three-channel demultiplexing using diode lasers.

    • Main Results:

    • Designed and fabricated WDM devices with high efficiency (> 85%).
    • Achieved polarization-insensitive operation.
    • Successfully demonstrated three-channel demultiplexing within the tested wavelength range.

    Conclusions:

    • The novel substrate-mode grating pair is a viable technology for WDM/demultiplexing.
    • The device design simplifies optical fiber alignment.
    • High efficiency and polarization insensitivity are achievable with this approach.