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Bidirectional MMWoF-wireless convergence system based on a 1610 nm L-band quantum-dash laser.

M Z M Khan, Q Tareq, A M Ragheb

    Optics Express
    |October 7, 2021
    PubMed
    Summary

    This study demonstrates a novel millimeter wave (MMW) system using a quantum-dash dual-mode laser for bidirectional fiber and wireless transmission. The system operates in the mid-L-band, showing potential for next-generation optical networks.

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    Area of Science:

    • Optical Communications
    • Wireless Networks
    • Semiconductor Lasers

    Background:

    • Millimeter wave (MMW) over fiber (MMWoF) and MMW over fiber wireless (MMWoF-WL) systems are crucial for high-speed data transmission.
    • Quantum-dash dual-mode lasers (QD-DMLs) offer potential as compact MMW sources.
    • Operation within the mid-L-band (1610 nm) is desirable for future optical network infrastructure.

    Purpose of the Study:

    • To demonstrate a bidirectional MMWoF and MMWoF-WL transmission system.
    • To utilize a single self-injection locked InAs/InP QD-DML as the MMW source.
    • To validate the system's performance in the challenging mid-L-band wavelength window.

    Main Methods:

    • Employing a QD-DML with 28 GHz mode spacing for MMW generation.

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  • Implementing downstream (DS) quadrature-phase-shift-keying (QPSK) transmission at 8 Gbits/s.
  • Achieving simultaneous upstream (US) 16-level quadrature amplitude modulation (16-QAM) at 8 Gbits/s.

    • Main Results:

    • Successful bidirectional transmission over 10 km of single-mode fiber (SMF) and up to 4 m wireless.
    • Demonstrated QPSK and 16-QAM data rates of 4.0 Gbaud and 2.0 Gbaud, respectively.
    • Observed significant influence of phase noise on the DS link, impacting receiver sensitivity.

    Conclusions:

    • The QD-DML is a viable MMW source for integrated optical and wireless systems.
    • The mid-L-band operation shows promise for next-generation optical networks.
    • Phase noise management is critical for optimizing receiver sensitivity in MMWoF and MMWoF-WL systems.