| 摘要 |
In a bidirectional optical transmission system between an optical subscriber unit (10; OSU) in a central office and a plurality of optical network units (20i; ONU) in customer premises each coupled with said subscriber unit (10) through an optical fiber cable, said optical subscriber unit (10) has a laser oscillator (11), means (12) for splitting an output beam of said laser oscillator to n number of beams, a plurality of optical modulators (13-1 through 13-n) coupled with each of said n number of beams for modulating related optical beam with transmission signal S for a respective optical network unit, a plurality of optical detectors (14-1 through 14-n) coupled with each of optical network units to provide receive signal R by converting receive optical signal to electrical form. Each pair of one of said optical modulators and one of said optical detectors are coupled with a respective optical network unit through an optical fiber cable (5-1, 5-2). Each of optical network units (20-1 through 20-n) has means for receiving optical signal from OSU, to convert receive optical beam to electrical signal and transmitting optical signal modulated with transmission signal to OSU. <IMAGE> |
