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Quantum Cascade LASER tech promises drastically increased data transmission speeds

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  • Quantum Cascade LASER tech promises drastically increased data transmission speeds


    New laser technology promises a future of fiber optic speeds thousands of times what they are now. Using "Terahertz Quantum Cascade LASERs" and a new modulation method data throughput could theoretically improve dramatically in coming years. These lasers have been around for a while but were limited to more theoretical or scientific use with the limits assumed on the application of their beams. It was just too difficult to work them to the same level as far lower frequency lasers.




     




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    The specific kind of lasers are different because they send out light in the terahertz range of the electromagnetic spectrum, which is largely used to analyse chemicals. But by turning them to use to send data, they could provide much faster connections for research facilities, hospitals, satellite communications or any other situations where very fast network connections are required.






     




    Apparently most of the fuss is over the new method of modulation. Terahertz is a very tough frequency range to modulate for communication. but a new method has allowed them to verifiably and consistently modulate and pulse the lasers in a way that will allow vastly accelerated transmission of coherent data. Which could theoretically allow super fast long distance trunk lines.




     




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    ABSTRACT:




    The fast modulation of lasers is a fundamental requirement for applications in optical communications, high-resolution spectroscopy and metrology. In the terahertz-frequency range, the quantum-cascade laser (QCL) is a high-power source with the potential for high-frequency modulation. However, conventional electronic modulation is limited fundamentally by parasitic device impedance, and so alternative physical processes must be exploited to modulate the QCL gain on ultrafast timescales. Here, we demonstrate an alternative mechanism to modulate the emission from a QCL device, whereby optically-generated acoustic phonon pulses are used to perturb the QCL bandstructure, enabling fast amplitude modulation that can be controlled using the QCL drive current or strain pulse amplitude, to a maximum modulation depth of 6% in our experiment. We show that this modulation can be explained using perturbation theory analysis. While the modulation rise-time was limited to ~800 ps by our measurement system, theoretical considerations suggest considerably faster modulation could be possible.






     




    I would like to see more work done on this, super high frequency EM radiation has so many theoretical uses I really wanna see practical and commodity uses for these advanced technologies




     





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    Sources:




    https://www.independent.co.uk/life-s...-a9328691.html




     




    https://www.nature.com/articles/s41467-020-14662-w








     



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