Mikael Abrahamsson <swmike@swm.pp.se> writes:

There should be quite a few manufacturers making units like these, I know the MRV people does it as well (or some company within MRV).

here's another: http://www.opticalaccess.com/products-ld.shtml Disclaimer: I'm not affiliated with the company, I'm not even a satisfied customer, I'm just some guy who typed "optical transponder DWDM" into Google and shoveled through what came out. ---rob