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320 Gb/s Nyquist OTDM received by polarization-insensitive time-domain OFT.

H Hu, D Kong, E Palushani

    Optics Express
    |February 12, 2014
    PubMed
    Summary

    Researchers generated a 320 Gb/s Nyquist-Optical Time-Division Multiplexing (OTDM) signal and successfully received it using polarization-insensitive time-domain optical Fourier transformation (TD-OFT). This advancement simplifies optical signal processing for high-speed data transmission.

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    Area of Science:

    • Optical communications
    • Signal processing
    • Photonics

    Background:

    • High-speed optical transmission systems require efficient signal generation and reception techniques.
    • Optical Time-Division Multiplexing (OTDM) is a key technology for increasing data rates.
    • Nyquist filtering is crucial for maximizing spectral efficiency in OTDM systems.

    Purpose of the Study:

    • To demonstrate the generation of a 320 Gb/s Nyquist-OTDM signal.
    • To showcase a polarization-insensitive reception method for Nyquist-OTDM signals.
    • To investigate the conversion of Nyquist-OTDM signals to Orthogonal Frequency Division Multiplexing (OFDM) signals for simplified demultiplexing.

    Main Methods:

    • Generation of a 320 Gb/s Nyquist-OTDM signal via rectangular filtering of an RZ-OTDM signal.
    • Reception using polarization-insensitive time-domain optical Fourier transformation (TD-OFT) with four-wave mixing (FWM).
    • Passive filtering for subcarrier extraction after TD-OFT conversion to an OFDM signal.

    Main Results:

    • Successful generation of a 320 Gb/s Nyquist-OTDM signal.
    • Nyquist-OTDM signal converted to an OFDM signal with sinc-shaped spectra per subcarrier via TD-OFT.
    • Demonstrated polarization sensitivity of less than 0.5 dB in the OTDM receiver using a polarization diversity scheme.
    • Simplified subcarrier extraction using passive filtering due to increased subcarrier spacing.

    Conclusions:

    • The study successfully demonstrated a high-speed Nyquist-OTDM signal generation and reception technique.
    • TD-OFT enables efficient conversion of Nyquist-OTDM signals to OFDM, facilitating simpler receiver designs.
    • The polarization-insensitive TD-OFT receiver shows high performance, crucial for robust optical communication systems.