this post was submitted on 13 Apr 2025
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Is 300 nm the diameter of the optical cable? This terminology breaks my brain, 300 nm is 1000 terahertz, which is unreasonably large for a signal bandwidth, it's like one milllion Ethernet cables.
I'm only making assumptions, but I'd guess that 300nm is the range of frequencies it can amplify. AFAIK fibre cables are used with multiple "channels" by sending data with different frequencies at once. Say your signal range is centered around 850nm, this amplifier could amplify in the range of 700-1000nm.
But I might be totally off, just guessing.
From the abstract: "we obtained a continuous-wave gain bandwidth of 330 nm in the near-infrared regime. [...] Furthermore, we realized wide all-optical wavelength conversion of single-wavelength signals beyond 100 Gbit s−1 without amplifying the signal and idler wave."
Here is the paper: https://www.nature.com/articles/s41586-025-08824-3
I think figure 4 from the PDF shows it the best. Their amplifier covers 1400 nm to 1700 nm infrared lasers.