[Cerowrt-devel] [Bloat] DC behaviors today

Mikael Abrahamsson swmike at swm.pp.se
Mon Dec 18 02:50:10 EST 2017

On Sun, 17 Dec 2017, Matthias Tafelmeier wrote:

> What I actually wanted to posit in relation to that is that one could 
> get sooner a c-cabable backbone sibling by marrying two ideas: the 
> airborne concept ongoing as outlined plus what NASA is planning to bring 
> about for the space backbone, e.g [1][2]. It's laser based instead of 
> directed radio-wave only. Sure, both is in the speed range of c, 
> apparantely, laser transmission has in addition a significantly higher 
> bandwidth to offer. "10 to 100 times as much data at a time as 
> radio-frequency systems"[3]. Attenuations to photons in clean 
> atmospheric air are neglible (few mps - refractive index of about 
> 1.0003), so actually a neglible slowdown - easily competing with top 
> notch fibres (99.7% the vacuum speed of light). Sure, that's the ideal 
> case, though, if cleverly done from the procurement of platforms and 
> overall system steering perspective, might feasible.

Todays laser links are in the few km per hop range, with is easily at 
least one magnitude shorter than radio based equivalents.

I don't know the physics behind it, but people who have better insight 
than I do tell me "it's hard" to run longer hops (if one wants any kind of 
high bitrate).

Mikael Abrahamsson    email: swmike at swm.pp.se

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