Please explain how you would "trivially" encrypt an optical line system that is capable of pushing 19TB down a single fiber (for example, http://www.advaoptical

Please explain how you would "trivially" encrypt an optical line system that is capable of pushing 19TB down a single fiber (for example, http://www.advaoptical.com/en/products/technology/dwdm.aspx http://www.advaoptical.com/en/products/technology/dwdm.aspx) The only people who think this is "trivially easy" are people who don't have to do it.