[time-nuts] Smart fiber-optic cable ( a reference to Hp's smart clock )

Bob Camp lists at rtty.us
Mon Feb 4 17:39:57 EST 2013


Hi

Consider that cost to manufacture the cable goes up as you put stuff in it. You not only need sensor packages, you also need to connect them so they can report data. Unless the sensors are optically powered and linked, they would compromise the inherent lighting immunity the fiber provides. 

It's a *lot* easier to do the same thing with a round trip traverse of the entire optical link. This is already done by at least one supplier of these parts. It may be done by several others as well. 

Cable delay is not the limiting issue on most short link systems. It's not clear that data rates would be improved by delay modeling.

Bob


On Feb 4, 2013, at 5:09 PM, Stanley <timenuts at n4iqt.com> wrote:

> If a fiber-optic cable had temperature sensors either installed with or embedded inside of this could make for better modeling changes in delay making more accurate transfer of time and frequency possible. With fiber to tower installs now under way to provide more data at cell towers why not backup GPS frequency and time transfer with the same medium ? Would this also increase the data rate of the cable ? That is faster rates due to the better timing uncertainty. 
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