On Friday 01 January 2010 23:19:30 Richard A Steenbergen wrote: > On Fri, Jan 01, 2010 at 02:52:33PM -0800, Mike wrote: > > I am looking at the possibility of leasing a ~70 mile run of fiber. I > > don't have access to any mid point section for regeneration purposes, > > and so I am wondering what the chances that a 120km rated SFP would be > > able to light the path and provide stable connectivity. There are a lot > > of unknowns including # of splices, condition of the cable, or the > > actual dispersion index or other properties (until we actually get > > closer to leasing it). Its spare telco fibers in the same cable binder > > they are using interoffice transport, but there are regen huts along the > > way so it works for them but may not for us, and 'finding out' is > > potentially expensive. How would someone experienced go about > > determining the feasibillity of this concept and what options might > > there be? Replies online or off would be appreciated. > > That shouldn't be too difficult, especially at only 1G (though pesonally > I can't imagine why you would bother leasing dark fiber for that :P). > There are several ways you could do it, including 120km+ rated SFPs > (iirc there have been 200km SFPs out for a while too), an external > optical amplifier (ideally you'd want to amp in the middle, but with a > single channel you should be fine w/pre-amp), and a digital FEC wrapper > to extend the receive sensitivity. Remember that the distance spec on > optics is mostly a rough guideline, so depending on the fiber conditions > and number of splices/panels along the way you could potentially expect > to get the entire distance out of a "standard" 100km optic.
There was an excellent thread on this list last year about using "unusual" high power lasers for long range optical networking. http://www.merit.edu/mail.archives/nanog/2008-10/msg00226.html
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