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Thanks to your interest on this blog, for your problem between Datang telecom and Datang mobile, let us look at back their history.

In year 1993, the post & Telecommunication institute was divided into three parts: China Academy of Telecommunication Technology,(CATT) China Academy of Telecommunications Research and Planning China Academy of Posts Research and Planning.
at the same time, Xi`an Datang Telecommunication Co. Ltd. was established based on 10th institute. Xi'an Datang specially developed on PBX switch at that time.
In 1998, Xi'an Datang developed GSM900/1800 system, the same year, Datang Telecom Technology Co., Ltd was established and then it ' s A-shares began to be traded publicly.
In year 1999, Datang group was established, Datang telecom and other research institutes of CATT was also merged into Datang group.
In year 2000, it was Datang group who introduced TD-SCDMA in ITUT.
In March 2002, Datang Mobile was established as the sign of the mature of TD-SCDMA. Datang Mobile headquarters in Beijing, with one subsidiary in Shanghai and one branch in Xi’an. Datang Mobile is dedicated to the research and development of TD-SCDMA. But because there is not a real TD market, there is in fact no revenue for Datang mobile for many years.
Because Datang telecom loses money for many years, also because of the 3G concept in stock market, Datang group has begun to merge Datang mobile with Datang Telecom.

For the problem about What technology are they going to use: GPON or EPON?
I can say except Huawei, maybe ZTE, all others are using EPON, because it is cheaper. There is one exempt, Former Photon technology's Beijing R&D center once worked on BPON, they were later purchased by RAD. There is also some others who work on ethernet FTTx solution like Cisco's.