4 ms·

So if glass slows the signal down, would it be possible to use a hollow fiber?

by im3w1l 6y ago

toomuchtodo 6y ago
Microwave is traditionally used to reduce latency caused by fiber’s refractive index. I suppose you could bury waveguides, but an air interface works just as well (besides the occasional weather; better to be fast most of the time). https://arstechnica.com/information-technology/2016/11/private-microwave-networks-financial-hft/ https://arstechnica.com/information-technology/2016/11/priva...
- selectodude 6y ago
  I can assure you, that link already exists several times over. There are dozens of links between Aurora and 350 E Cermak, and dozens more between 350 E Cermak and Cateret, NJ. There's even an entire ISP based off the lowest latency link between Chicago and New York. https://en.wikipedia.org/wiki/Spread_Networks https://en.wikipedia.org/wiki/Spread_Networks
  - deleted 6y ago
    [deleted]
  - acjohnson55 6y ago
    What's in Aurora? And why West Chicago in the original article? Amusingly, I grew up 2 towns over from Aurora and live 3 towns from Carteret now.
    - jleahy 6y ago
      The CME datacenter is in Aurora, and the ICE datacenter is in Chicago proper.
      - acjohnson55 6y ago
        Ah, cool. Is there a significant operation in West Chicago, too? From the article, I was still confused by why a shortwave tower would be located there. West Chicago is close to Aurora, I suppose, but if it's for CME data center, why not put the tower in Aurora?
    - selectodude 6y ago
      Heh, that became very confusing. The post I replied to was edited at some point asking why there isn’t a direct microwave link down I-88 in Chicago. Sorry about that :)
H8crilA 6y ago
Or a much thicker fiber with conductive coating while sending microwaves through it? Shorter microwaves should be transmissible via a few mm wide conductive pipe.
walrus01 6y ago
Not with anywhere nearly as good as the 0.28db/km attenuation achieved on modern singlemode 9/125 fiber.
Junk_Collector 6y ago
Yes, that would commonly be called circular wavegguide. The issue with using waveguide is that it is very expensive to run over distances. WR-75 flexible waveguide, for instance, costs roughly $1k/ft.

So if glass slows the signal down, would it be possible to use a hollow fiber?

by im3w1l 6y ago

So if glass slows the signal down, would it be possible to use a hollow fiber?

Microwave is traditionally used to reduce latency caused by fiber’s refractive index. I suppose you could bury waveguides, but an air interface works just as well (besides the occasional weather; better to be fast most of the time). https://arstechnica.com/information-technology/2016/11/private-microwave-networks-financial-hft/ https://arstechnica.com/information-technology/2016/11/priva...

selectodude 6y ago
I can assure you, that link already exists several times over. There are dozens of links between Aurora and 350 E Cermak, and dozens more between 350 E Cermak and Cateret, NJ. There's even an entire ISP based off the lowest latency link between Chicago and New York. https://en.wikipedia.org/wiki/Spread_Networks https://en.wikipedia.org/wiki/Spread_Networks
- deleted 6y ago
  [deleted]
- acjohnson55 6y ago
  What's in Aurora? And why West Chicago in the original article? Amusingly, I grew up 2 towns over from Aurora and live 3 towns from Carteret now.
  - jleahy 6y ago
    The CME datacenter is in Aurora, and the ICE datacenter is in Chicago proper.
    - acjohnson55 6y ago
      Ah, cool. Is there a significant operation in West Chicago, too? From the article, I was still confused by why a shortwave tower would be located there. West Chicago is close to Aurora, I suppose, but if it's for CME data center, why not put the tower in Aurora?
  - selectodude 6y ago
    Heh, that became very confusing. The post I replied to was edited at some point asking why there isn’t a direct microwave link down I-88 in Chicago. Sorry about that :)

H8crilA 6y ago

Or a much thicker fiber with conductive coating while sending microwaves through it? Shorter microwaves should be transmissible via a few mm wide conductive pipe.

walrus01 6y ago

Not with anywhere nearly as good as the 0.28db/km attenuation achieved on modern singlemode 9/125 fiber.

Junk_Collector 6y ago

Yes, that would commonly be called circular wavegguide. The issue with using waveguide is that it is very expensive to run over distances. WR-75 flexible waveguide, for instance, costs roughly $1k/ft.