[time-nuts] sub cables

Magnus Danielson magnus at rubidium.dyndns.org
Thu May 1 18:30:37 EDT 2008

From: Scott Mace <smace at intt.net>
Subject: Re: [time-nuts] sub cables
Date: Thu, 01 May 2008 16:30:43 -0500
Message-ID: <481A3683.4050300 at intt.net>

> A repeater or regen goes optical-electrical-optical.  I think you are
> talking about an EDFA.  While it may pass light when it's down, one
> has to take into account the optical budget of the span.

Modern sub cables does not used a distributed line of EDFAs anymore. They use
the entire cable length as an amplifier instead. If the laser is down, you can
reach it and service it, since it sits on dry land anyways.

I have an EDFA lying around my office desk. Never know when I need one.
Uses a 250 mW 850 nm pumping laser.


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