The zero dispersion wavelength of G.652.D fiber is between 1302 nm and 1322 nm, in the O-band, whereas typical current DWDM systems operate in the range of 1528.38 to 1563.86nm, in the C-band. Group dispersion is therefore lower in the shorter wavelength E-band and S-band compared to the C-band.
Comment on Researchers unlock fiber optic connection 1.2 million times faster than broadband
humbletightband@lemmy.dbzer0.com 4 weeks ago
I’m highly suspicious about group dispersion over long distances. Today’s infrastructure was developed for a certain range of frequencies. Broading it right away wouldn’t be applicable that easy - we would need to introduce error correction which compromises the speed multiplier.
Too lazy to get the original paper though
Kazumara@discuss.tchncs.de 4 weeks ago
blarth@thelemmy.club 4 weeks ago
We already have transceivers that perform forward error correction. That technology is a decade+ old.
humbletightband@lemmy.dbzer0.com 4 weeks ago
It is, but it compromises the speed exponentially with length/broadening
blarth@thelemmy.club 4 weeks ago
Dispersion compensation and FEC are separate layers of the cake, and work hand in hand.
humbletightband@lemmy.dbzer0.com 4 weeks ago
I don’t understand why, tho I do not have any kind of expertise here.
I suggest (Haven’t read it), this paper proposes to send much denser and broadened signals around one carrier frequency (they use single mode). Due to dispersion they
Start to overlap with one each other. If you put more frequencies, you would have more overlaps and I fail to see how it won’t lead to errors.
They all arrive at the broader time window, which again could be mitigated either by error correction, or by extending the time window.