100GbE beyond 40km

Wed Sep 29 02:02:21 UTC 2021

On 9/27/21 1:47 PM, Brandon Butterworth wrote:
> You're looking for SOA at 1300nm, like
> https://www.fs.com/uk/products/69350.html

Getting much more power out of a SOA than a -ZR QSFP28 is pretty hard, 
though they could be used for non-OEO re-generation in the middle if 
practical in your topology.

There does also exist a PDFA.  Same concept, different dopant in the 
fiber.  They are...expensive.  However, you can get a crazy amount of 
power out of them, and they're available with a lower noise floor than 
SOAs seem to be, as well.  If you really want to make that 80-100km link 
at 1310nm and without going coherent, they are a potential option.  When 
I inquired with a manufacturer/rep (what appears to be the only one in 
the world), it was almost as expensive as a coherent transponder on both 
ends.

--
Brandon Martin