I found a nice product, http://www.opticalzonu.com/sfc/otdrsfc/ - I'm in contact with David Jenkins from Optical Zonu and according to him, supporting their OTDR features is as hard/trivial, as supporting normal DDM.
Modules are priced at $500 USD for single units, and are interoperable with normal transceivers on remote side, so one is needed per cable/strand, at the same time providing transmission capabilities.
Contact details for mr Jenkins:
Optical Zonu Europe
+44 1359 298 198
I hope you can work together and add support for this