Abu Dhabi Investment Authority is considering bidding for a stake in PCCW Limited (SEHK:8)?s fiber business, people familiar with the matter said, a move that would help the oil-rich emirate expand into Greater China. ADIA, as the Abu Dhabi wealth fund is known, is in discussions for a significant minority stake in PCCW?s fiber assets for about $1 billion, the people said, asking not to be identified because the matter is private.