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Performance optimization of multi-plane light conversion (MPLC) mode multiplexer by error tolerance analysis.

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    This summary is machine-generated.

    This study analyzes error tolerances for multi-plane light conversion (MPLC) mode multiplexers, providing design rules to improve fabrication and alignment accuracy. These rules enable robust performance for few-mode fiber communication systems.

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    Area of Science:

    • Optics and Photonics
    • Optical Communications
    • Integrated Optics

    Background:

    • Linear polarized (LP) mode multiplexers based on inverse designed multi-plane light conversion (MPLC) offer low insertion loss and crosstalk.
    • Experimental implementation of MPLC multiplexers faces challenges due to fabrication and alignment accuracy requirements.

    Purpose of the Study:

    • To systematically analyze the error tolerances of MPLC-based LP mode multiplexers/demultiplexers.
    • To establish design rules that enhance fabrication and alignment robustness for MPLC devices.
    • To experimentally validate the derived design rules.

    Main Methods:

    • Performed error tolerance analysis on MPLC structures.
    • Identified key parameters influencing device performance, including optical beam waist, array pitch, and propagation distances.
    • Experimentally demonstrated an LP mode multiplexer/demultiplexer based on the derived design rules.

    Main Results:

    • Error tolerances were significantly relaxed by optimizing input/output optical beam waist, pitch of optical beam array, and propagation distances.
    • Experimental demonstration achieved insertion loss below -5 dB and crosstalk below -10 dB for LP01, LP11a, LP11b, and LP21 modes.
    • Transmission of 10 Gbit/s signals over 5 km of few-mode fiber showed power penalties below 12 dB for LP01, LP11a, and LP21 modes.

    Conclusions:

    • The study provides crucial design rules for MPLC-based LP mode multiplexers, enhancing their practical viability.
    • Optimized MPLC designs can overcome fabrication and alignment sensitivities, enabling reliable few-mode fiber communication.
    • The demonstrated device performance confirms the effectiveness of the design rules for high-speed optical signal transmission.