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Updated: Aug 25, 2025

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Multi-modulation compatible miniaturization system for FSO communication assisted by chirp-managed laser.

Duorui Gao, Tianlun Li, Zhaofeng Bai

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    |October 15, 2022
    PubMed
    Summary

    A new chirp-managed laser (CML) system enables seamless switching between intensity (OOK) and phase modulation (RZ-DPSK) for satellite laser communications. This CML approach offers improved performance and reduced Size, Weight, and Power (SWaP) compared to traditional methods.

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    Area of Science:

    • Optical communications
    • Satellite technology
    • Laser physics

    Background:

    • Satellite laser communication faces challenges with incompatible modulation formats and Size, Weight, and Power (SWaP) limitations.
    • Existing systems often require complex modulators, hindering miniaturization and efficiency.

    Purpose of the Study:

    • To propose and demonstrate a multi-modulation compatible method for free-space optical (FSO) communication using chirp-managed laser (CML) technology.
    • To evaluate the performance of a CML-based system capable of free-switching between On-Off Keying (OOK) and Return-to-Zero Differential Phase-Shift Keying (RZ-DPSK) modulation.
    • To compare the CML-based system's SWaP and performance against a traditional Mach-Zehnder modulator (MZM) based system.

    Main Methods:

    • Developed a demonstration system utilizing a chirp-managed laser (CML) for free-space optical (FSO) communication.
    • Implemented free-switching capability between intensity (OOK) and phase (RZ-DPSK) modulation formats.
    • Conducted comparative performance analysis with a control system using a Mach-Zehnder modulator (MZM) at data rates of 2.5 Gbps and 5 Gbps.

    Main Results:

    • The CML-based system demonstrated superior receiving sensitivities for both OOK and RZ-DPSK compared to the MZM-based system.
    • OOK sensitivities were -47.02 dBm (2.5 Gbps) and -46.12 dBm (5 Gbps), outperforming MZM by 0.62 dB and 1.11 dB.
    • RZ-DPSK sensitivities were -50.12 dBm (2.5 Gbps) and -47.03 dBm (5 Gbps), outperforming MZM by 0.79 dB and 0.47 dB.
    • The CML transmitter eliminated the need for traditional modulators, significantly reducing SWaP.

    Conclusions:

    • The CML-based system successfully achieves modulation compatibility (OOK and RZ-DPSK) with a miniaturized design.
    • This approach offers a practical solution for reducing SWaP in satellite communication systems.
    • The CML technology presents a novel strategy for developing compact and efficient systems for future space optical networks.