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    This study introduces a new polarization-dependent semiconductor optical amplifier (SOA) method for robust free-space optical (FSO) communication. This technique effectively mitigates scintillation, achieving bit-error-rate performance comparable to traditional methods.

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    Area of Science:

    • Optoelectronics
    • Optical Communications
    • Free-Space Optics

    Background:

    • Free-space optical (FSO) communication systems are susceptible to atmospheric turbulence, which causes signal fading (scintillation).
    • Polarization Shift Keying (PolSK) modulation offers potential for improved FSO performance, but requires robust implementation.
    • Semiconductor Optical Amplifiers (SOAs) possess nonlinear gain and polarization characteristics that can be exploited for modulation.

    Purpose of the Study:

    • To propose and experimentally validate a novel polarization-dependent SOA-based PolSK modulation scheme.
    • To enhance the robustness of FSO communication against atmospheric turbulence and scintillation.
    • To evaluate the performance of the proposed modulation technique compared to conventional methods.

    Main Methods:

    • Utilizing a polarization-dependent SOA and a linear polarizer (LP) to achieve optical bit inversion for PolSK modulation.
    • Modulating the PolSK signal based on the nonlinear gain and polarization properties of the SOA.
    • Analyzing scintillation mitigation capabilities under different detection schemes (balanced and polarization-independent SOA-based detection).

    Main Results:

    • Experimental demonstration of the proposed polarization-dependent SOA-based PolSK modulation.
    • The technique effectively mitigates scintillation effects in FSO communication.
    • Achieved bit-error-rate (BER) performance was comparable to conventional Mach-Zehnder modulator (MZM)-based PolSK modulation under various scintillation conditions.

    Conclusions:

    • The proposed polarization-dependent SOA-based PolSK modulation is a viable technique for turbulence-robust FSO communication.
    • This method offers a competitive alternative to existing PolSK modulation schemes, particularly in challenging atmospheric conditions.
    • The findings highlight the potential of leveraging SOA characteristics for advanced optical communication modulation formats.