CWDM is cheaper and will probably work fine within a city.  Check fs.com.

On Thu, Nov 02, 2017 at 06:01:10PM +0000, LF OD wrote:
> We have several buildings and a couple data centers spread around the city 
> and interconnected via dark fiber. It's a very simple setup - no ROADM, no 
> real ring, no extended layer-2 or layer-3 via the optical gear.
> 
> 
> Pretty much we just mux/demux a channel for each building so that each 
> building sees the two data centers directly even though the fiber span may 
> wind through a couple buildings along the way. In some cases, the distance is 
> short enough to use colored optics in the network gear, but mostly the 
> distances are just long enough to warrant transponder cards.
> 
> 
> All that being said, a lot of the gear is approaching end of life (support in 
> some cases). I'm not an optical guru but I can muddle my way through with 
> Cisco ONS and I'm aware that Ciena and Fujitsu also have similar products. We 
> really don't have budget for a large optical refresh effort. However, we've 
> saved some money here and there in the routing/switching arena by leveraging 
> Arista and even Cumulus. I'm wondering if there are smaller players in the 
> optical arena that have a good quality/price value?
> 
> 
> Again, we don't need sophisticated features... we primarily have 2-to-4 1Gb 
> and 10Gb ports required per site, then we mux those onto a wavelength and 
> extend it to the two data centers. Most buildings are set up the same way, 
> each on a different wavelength so the don't even see each other... only the 
> data centers.
> 
> 
> If you guys know of any optical gear that you can vouch for (and which costs 
> less than a small house), we would greatly appreciate it. Thanks
> 
> 
> LFOD

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