| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an optical subscriber transmission system capable of solving problems such as the probability of wiretapping of optical signals and requirement of additional light source equipment in a conventional system. <P>SOLUTION: The optical subscriber transmission system comprises an intra-office device, a plurality of customer station devices stored in the intra-office device and a star coupler arranged between the intra-office device and these customer station devices. The intra-office device sends a common wavelength signal and individual wavelength signals corresponding to respective customer station devices to the down direction to these customer station devices as down signals. Each of the customer station devices receives the down signals, detects an arrival time difference between the common wavelength signal and the corresponding individual wavelength signal and sends the information of the detected arrival time difference to the intra-office device by a signal of the wavelength corresponding to the customer station device concerned as an up signal. <P>COPYRIGHT: (C)2005,JPO&NCIPI |
