A lot of efforts have been made to develop low-cost and reliable broadband optical subscriber loop systems. Here we propose a new loop system with shared ligh sources and remote modulation method. This system uses an external modulation method for both directions and all the light sources are maintained inside a central office. Moreover, the ligh source is not dedicated to each subsriber link but shared among many subscriber links. We expermentally demonstrated that one shared light source could accommodate about 2, 000 deownstream links(2.5 Gb/s per link), 500 upstream links(155 Mb/s per link).