 Brazilian telecommunications company Oi SA is preparing to raise more than 2 billion reais 363 million by the start of 2021 to expand its fiber optic network, newspaper O Estado de S.Paulo said on Tuesday. Oi filed for the largest-ever bankruptcy protection in 2016 and has been undergoing restructuring with an aim to exit the bankruptcy process in 2022. Estado did not give further details on how Oi would raise the money. 