| 摘要 |
A passive optical network (PON) comprising optical fibers and optical couplers. An central equipment 10 comprises a hub 16, plural modems 17, a mixer 18, and a splitter 19. Carrier waves of a predetermined frequency are assigned to the plural modems 17 and each customer equipment 60. In the downstream, the hub 16 selects each modem 17 (that is, each customer equipment 60) and converts the assigned carrier wave into modulated signals. The modulated signals are mixed in the mixture 18, converted into frequency-multiplexed signals, and transmitted through a first optical coupler 52 to the customer equipment 60. Each customer equipment 60 demodulates the signals by using carrier waves of the assigned frequency. In the upstream, a first optical coupler 53 converts signals from each customer equipment 60 into frequency-multiplexed signals and transmits to the central equipment 10. In the central equipment 10, the splitter 19 branches the signals per each carrier wave of the assigned wavelength, and each modem 17 demodulates the signals. As a result, a passive optical network (PON) is realized.
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