Patent ID: 7725031
Filing Date: 2010-05-25
Classification: H04J

Abstract:
1. An optical communication system comprising: a station-side communication device; a plurality of subscriber-side communication devices; and an optical combining device connecting the plurality of subscriber-side communication devices to the station-side communication device, wherein: the station-side communication device transmits to said plurality of subscriber-side devices a distance measurement request signal for measuring distances from said station-side communication device to respective said plural subscriber-side communication devices, receives distance measurement signals which are replies to said distance measurement request signal from said plurality of subscriber-side communication devices, and computes transmission delay times of optical signals from said individual subscriber-side communication devices, said station-side communication device comprising: said subscriber-side communication devices return a plurality of said distance measurement signals to said station-side communication device, when receiving said distance measurement request signals from said station-side communication device.