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Related Concept Videos

Time and frequency -Domain Interpretation of Phase-lead Control01:24

Time and frequency -Domain Interpretation of Phase-lead Control

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Phase-lead controllers are commonly used in various control systems to enhance response speed and stability. Adjusting the brightness on a television screen offers a practical example of phase-lead control. When contrast is enhanced, a phase-lead controller is employed. Mathematically, phase-lead control is identified when the first parameter is smaller than the second.
The design of phase-lead control involves the strategic placement of poles and zeros to balance steady-state error and system...
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Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator
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Maximum probability directed blind phase search for PS-QAM with variable shaping factors.

Zexin Chen, Songnian Fu, Ming Tang

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    |February 24, 2022
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    Summary
    This summary is machine-generated.

    We developed a Maximum Probability Directed Blind Phase Search (MPD-BPS) to improve carrier phase estimation for probabilistically shaped-quadrature amplitude modulation (PS-QAM). This method enhances signal-to-noise ratio and transmission reach for optical communication systems.

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    Area of Science:

    • Optical Communications
    • Digital Signal Processing

    Background:

    • Carrier phase estimation (CPE) is crucial for coherent optical systems.
    • Probabilistically shaped-quadrature amplitude modulation (PS-QAM) offers improved spectral efficiency but requires robust CPE.
    • Traditional blind phase search (BPS) algorithms face challenges with variable shaping factors in PS-QAM.

    Purpose of the Study:

    • To propose and evaluate a Maximum Probability Directed Blind Phase Search (MPD-BPS) for enhanced CPE in PS-QAM.
    • To investigate the trade-offs between shaping factor (SF) and noise rejection window in BPS.
    • To optimize SF and noise rejection window for maximum achievable information rate (AIR).

    Main Methods:

    • Numerical investigation of the SF and BPS noise rejection window trade-off for PS-64/256QAM.
    • Joint optimization of SF and noise rejection window for maximizing AIR at fixed SNR.
    • Performance comparison between MPD-BPS and traditional BPS for variable SFs.
    • Experimental verification using 32 Gbaud PS-64QAM under back-to-back (B2B) and standard single mode fiber (SSMF) loop transmission.

    Main Results:

    • MPD-BPS demonstrates superior performance compared to traditional BPS for PS-64/256QAM with varying SFs.
    • Numerical analysis revealed optimal joint configurations for SF and noise rejection window.
    • Experimental results showed an average 0.13 dB SNR enhancement in B2B transmission.
    • Experimental results indicated a 1.67% reach enhancement in SSMF transmission.

    Conclusions:

    • The proposed MPD-BPS effectively enhances CPE capability for PS-QAM systems.
    • MPD-BPS offers significant performance improvements in both SNR and transmission reach.
    • This technique is valuable for future high-capacity optical communication systems.