[190560] in North American Network Operators' Group
Re: Interesting Article on Modulation Schemes
daemon@ATHENA.MIT.EDU (Eric Kuhnke)
Fri Jul 8 16:41:02 2016
X-Original-To: nanog@nanog.org
In-Reply-To: <DM3PR13MB068780B608D89836C68AE383E43C0@DM3PR13MB0687.namprd13.prod.outlook.com>
From: Eric Kuhnke <eric.kuhnke@gmail.com>
Date: Fri, 8 Jul 2016 13:40:55 -0700
To: Rod Beck <rod.beck@unitedcablecompany.com>
Cc: "nanog@nanog.org" <nanog@nanog.org>
Errors-To: nanog-bounces@nanog.org
Essentially the transceiver optics are applying the same modulation and
coding that have been used in point-to-point microwave for a long time...
Starting from OOK, up to BPSK and then on to QPSK, 16QAM and possibly 64QAM
with varying levels of FEC.
A singlemode fiber is just an extremely narrow diameter waveguide. Big
difference in frequency between a 71-86 GHz FDD radio pair and optical at
191 to 196 THz.
On Fri, Jul 8, 2016 at 1:50 AM, Rod Beck <rod.beck@unitedcablecompany.com>
wrote:
> The new undersea cable systems are now capable of 18 terabits per fiber
> pair. It is interesting how combinations of bits are being represented by
> combinations of optical features.
>
>
>
> http://www.lightwaveonline.com/articles/print/volume-30/issue-5/features/which-optical-modulation-scheme-best-fits-my-application.html
>
>
> Roderick Beck
>
> Director of Global Sales
>
> United Cable Company
>
> www.unitedcablecompany.com<http://www.unitedcablecompany.com>
>
>
