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Integrated tunable mode filter for a mode-division multiplexing system.

Chunlei Sun, Wenhao Wu, Yu Yu

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    |August 2, 2018
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    Summary
    This summary is machine-generated.

    Researchers developed a tunable mode filter for flexible optical networks. This silicon-based device enables dynamic filtering of spatial modes in mode-division multiplexing (MDM) systems, enhancing communication capacity.

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    Area of Science:

    • Optical Communications
    • Photonics
    • Integrated Optics

    Background:

    • Mode-division multiplexing (MDM) enhances communication capacity by using spatial modes as independent signals, often combined with wavelength-division multiplexing (WDM).
    • Effective mode filtering is crucial in MDM systems to isolate desired spatial modes and suppress unwanted ones.
    • Existing solutions lack tunability, limiting flexibility in dynamic optical network configurations.

    Purpose of the Study:

    • To propose and experimentally demonstrate a novel tunable mode-pass filter for flexible mode-division multiplexing optical networks.
    • To achieve dynamic filtering and tunable output capabilities for spatial modes.
    • To validate the performance of the proposed filter on a silicon photonic platform.

    Main Methods:

    • The proposed device integrates two switchable mode exchangers (MEs) with a fundamental-mode pass filter on a silicon platform.
    • The filter's tunability is achieved by controlling the operational states of the switchable MEs.
    • Experimental validation involved testing the filter with a 20 Gb/s modulated signal.

    Main Results:

    • The tunable mode filter demonstrated a high extinction ratio of 18 dB and low insertion loss of 3 dB across the C-band.
    • Successful filtering of fundamental or high-order modes was achieved through dynamic control of the MEs.
    • Performance was confirmed by analyzing eye diagrams and bit error rates for a 20 Gb/s signal.

    Conclusions:

    • The developed silicon-based tunable mode filter offers a flexible solution for advanced mode-division multiplexing optical networks.
    • The device provides efficient mode filtering with high extinction ratios and low insertion losses.
    • Experimental results confirm its suitability for high-speed optical communication systems.