Anyone try Theta's single mode or Laserlinqe?

My brother has this on his Theta equipment and it is wonderful. I am using balanced cables (Tara Decade) with my Theta equipment, along with a Genesis Digital Lens. This is also great. We have never directly compared them as we are running different DACs - he has a Gen IIIa, while I have a Gen Va balanced. Theta calls this Laserlinque but it is AT&Ts single mode, which is used in the computer industry. Enter "Single Mode" on ebay and lots of stuff pops up. If I knew what to buy, I'd install it in my Theta stuff and try it out. It would cost about $2000 to have Theta install it. If any computer folks out there know where to get the modules, I'd sure like to know. Hope this helps, Don