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Cut-off Frequency of BJT01:17

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Cut-off frequencies in Bipolar Junction Transistors (BJTs) mark the transition between the signal's pass band and stop band, influencing their performance in amplifying or attenuating frequencies. These frequencies are crucial for designing BJTs to meet specific operational requirements in electronic circuits.
Alpha Cut-Off Frequency: Pertinent to the common-base configuration, the alpha cut-off frequency defines the upper-frequency limit at which the current gain, alpha, remains stable. As...
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    We developed a hybrid wavelength tuneable source (WTS) for faster data centre networks. This artificial intelligence-optimized device achieves record sub-900 picosecond wavelength switching times across a wide optical bandwidth.

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    Area of Science:

    • Photonics and Optical Communications
    • Data Centre Networking
    • Artificial Intelligence in Engineering

    Background:

    • Wavelength routed optical switching offers potential for low power and latency in data centres.
    • A critical requirement is a wideband wavelength tuneable source (WTS) with sub-nanosecond switching capabilities.
    • Existing WTS technologies face challenges in achieving both wide bandwidth and rapid switching.

    Purpose of the Study:

    • To propose and demonstrate a novel hybrid WTS architecture.
    • To achieve record-breaking wavelength switching times and wide optical bandwidth.
    • To explore methods for further enhancing bandwidth scalability in optical switching.

    Main Methods:

    • A hybrid WTS design combining time-interleaved tuneable lasers and semiconductor optical amplifiers.
    • Optimization of individual device performance using artificial intelligence (AI) algorithms.
    • Experimental validation and simulation of the WTS performance, including switching time and bandwidth.

    Main Results:

    • Demonstrated record wavelength switch times below 900 picoseconds (ps).
    • Achieved a continuously tuneable optical bandwidth of 6.05 THz (equivalent to 122 channels of 50 GHz).
    • Evaluated a novel method for scaling the optical bandwidth.

    Conclusions:

    • The proposed hybrid WTS meets the critical requirements for next-generation data centre optical switching.
    • AI-driven optimization significantly enhances WTS performance, achieving unprecedented switching speeds and bandwidth.
    • The demonstrated technology and bandwidth scaling methods pave the way for more efficient and faster optical networks.