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Managing signal sampling rates is essential in digital signal processing to maintain signal integrity. A decimated signal, characterized by a reduced frequency range due to its lower sampling rate, can be upsampled by inserting zeros between each sample. This upsampling process expands the original spectrum and introduces repeated spectral replicas at intervals dictated by the new Nyquist frequency. To refine this zero-inserted sequence, it is passed through a lowpass filter with a cutoff...
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Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping
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Single-step digital backpropagation for subcarrier-multiplexing transmissions.

Huazhi Lun, Qunbi Zhuge, Zhuopeng Xiao

    Optics Express
    |December 25, 2019
    PubMed
    Summary

    We developed a simplified digital backpropagation (DBP) algorithm for high-speed optical transmissions. This modified subcarrier-multiplexing DBP (M-SCM-DBP) significantly reduces complexity while improving performance for long-haul fiber links.

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    Area of Science:

    • Optical Communications
    • Digital Signal Processing
    • Fiber Optic Transmission

    Background:

    • High-order modulation formats in optical transmissions face challenges from nonlinear impairments and chromatic dispersion.
    • Digital backpropagation (DBP) is crucial for compensating these impairments but often demands high computational complexity.
    • Existing DBP methods require significant resources, limiting their application in metro and regional networks.

    Purpose of the Study:

    • To propose and demonstrate a computationally efficient single-step digital backpropagation algorithm.
    • To enhance performance and reduce complexity for metro and regional optical transmission systems.
    • To enable the use of high-order modulation formats over extended fiber links.

    Main Methods:

    • A modified subcarrier-multiplexing digital backpropagation (M-SCM-DBP) algorithm was developed.
    • Incorporated an infinite impulse response (IIR) filter for self-subcarrier nonlinear compensation.
    • Integrated second-stage chromatic dispersion (CD) compensation into an adaptive filter.

    Main Results:

    • The M-SCM-DBP achieved 86.3% complexity reduction compared to low-pass filter assisted DBP.
    • Demonstrated a 0.6-dB Q² improvement for SCM-PDM-32QAM transmission over 960-km standard single mode fiber (SSMF).
    • Extended transmission reach by 36% to 1220-km with low computational cost (30.5 complex multiplications per sample).

    Conclusions:

    • The proposed M-SCM-DBP offers a significant reduction in computational complexity for optical signal processing.
    • Achieves superior performance gains in Q² and transmission reach for high-order modulation formats.
    • The adaptive filter's ability to simultaneously compensate for CD and polarization impairments is validated.