Huawei has delivered a testable 50G unit to China Mobile and passed testing at the European Advanced Networking Test Center.
They also offer a 100 gigabit unit with four 25 gigabit devices. A 2 x 50G unit is planned that will be air-cooled.
Verizon has chosen 40 gigabit NG-PON2 for small cell backhaul, but most other carriers are choosing ten gigabits. Verizon has been testing NGPON2 from Calix and Adtran for a year and is now deploying hundreds of 5G small cells.