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    A new time domain multiplexed (TDM) spatial division multiplexing (SDM) receiver enables reception of multiple modes using a single coherent receiver. This advanced optical communication technology simplifies hardware while maintaining performance for high-speed data transmission.

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    Area of Science:

    • Optical communications
    • Signal processing
    • Fiber optics

    Background:

    • Spatial division multiplexing (SDM) and time domain multiplexing (TDM) are key technologies for increasing fiber optic communication capacity.
    • Current SDM systems often require multiple complex coherent receivers for each spatial mode.
    • Efficiently receiving multiple modes with reduced hardware is a significant challenge in optical networks.

    Purpose of the Study:

    • To demonstrate a novel TDM-SDM receiver capable of receiving multiple dual-polarization modes with a single coherent receiver.
    • To experimentally validate the performance of this integrated receiver system.
    • To compare the performance of the TDM-SDM receiver against existing multi-receiver setups.

    Main Methods:

    • Experimental demonstration of a novel TDM-SDM receiver architecture.
    • Utilizing a single coherent receiver and a 4-port oscilloscope for multi-mode reception.
    • Transmission of 28GBaud QPSK, 8, 16, and 32QAM signals over 41.7km of few-mode fiber.
    • Employing carrier phase estimation with digital phase-locked loops for frequency offset compensation.

    Main Results:

    • Successful reception of >1 dual-polarization mode using a single coherent receiver and 4-port oscilloscope.
    • Demonstration of 3-mode transmission with various modulation formats (QPSK to 32QAM) over few-mode fiber.
    • Performance comparable to systems using three dedicated coherent receivers for each mode.
    • Effective frequency offset compensation using digital phase-locked loops.

    Conclusions:

    • The novel TDM-SDM receiver offers a simplified and efficient solution for multi-mode optical signal reception.
    • This technology reduces hardware complexity and potentially lowers costs in high-capacity optical networks.
    • The demonstrated performance indicates its viability for future high-speed, high-capacity fiber optic communication systems.