DWDM SFP's

I don't know about the first half but should you need to go for plan B here are some suggestions:

 

 

Assuming I read DWDM correctly as "We use SONET/SDH"... ADC makes a product called Loopstar that encapsulates Ethernet and sends it over SONET.

 

 

https://www-wsp.adc.com/ecom/catalog/hierDisplay.do?NODE=OND92996

 

 

Also, Engage Communications makes a device, called the IP-Tube E^2, that will easily tunnel Ethernet over IP (if you have a VPN between the connections).

 

 

http://www.engageinc.com/Products2/iptube_E2.htm