[Cerowrt-devel] LCA 2018 talk available
swmike at swm.pp.se
Thu Feb 15 04:59:46 EST 2018
On Thu, 15 Feb 2018, Joel Wirāmu Pauling wrote:
> If POF (Plastic Optical Fibre) like install methods can be scaled up
> to Polymer/Glass runs (Sharpie knife slicing/jam into receptor). I
> don't see this being the problem. Depending on the Sheathing fibre is
> just as good as UTP cabling. Magnitudes cheaper too.
> When I learnt of POF I was excited, until I learned how it's severely
> limited in the bandwidth/frequency transmission department.
> I guess if we could get some sort of Clamp-on USB-C style adaptor for
> fibre would probably be the ideal. I don't really see why this
> couldn't work with MPO style fibre.
Problem with multimode fibers (that I imagine all above are) is that they
have really low reach at higher speeds. So if your goal is to support 100G
cheaply, I doubt the above will work very well.
"100G transmission over GI-POF is demonstrated by using 112-Gb/s
PolMux-QPSK modulation and digital coherent detection. The transmission
distance over 100m and simplified coupling method is suitable for optical
PolMux-QPSK is never going to be cheap'n'easy, it requires substantial
amount of components and processing power at both ends of the fiber.
For cheap GI-POF 1000BASE-RH has been defined
http://www.ieee802.org/3/GEPOFSG/email/pdfKiCuEsVuMv.pdf but it's only
1GE. I doubt POF is a solution to your 10GE/100GE transmission speeds
So I think the conclusion basically is: 10GE and up is hard. There are
real physical limitations here. I would be very happy if we could prove
Shannon wrong. :P
Mikael Abrahamsson email: swmike at swm.pp.se
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