| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an optical fiber capable of performing bi-directional transmission between a subscriber unit and a station terminal by configuring a PON topology. <P>SOLUTION: Provided is an optical transmission system using four-wave mixing which is configured in a WDM-PON topology where a signal light between a station terminal 11 and each of subscriber units 13-1, ..., 13-N is multi/demultiplexed at a WDM 12. The station terminal 11 transmits downlink signal light having wavelengths λ<SB>d1</SB>, ..., λ<SB>dN</SB>and pumping lights having wavelengths λ<SB>p1</SB>, ..., λ<SB>pN</SB>which are different by a predetermined wavelength difference Δλ from the wavelengths of the downlink signal lights in a downward direction, that is, in a direction toward the subscriber units 13-1, ..., 13-N. Each of the subscriber units 13-1, ..., 13-N demultiplexes the downlink signal lights to receive a portion of the downlink signal lights, generates an uplink signal light to be transmitted from each of the subscriber unit to the station terminal by using a portion of the downlink signal lights and the four-wave mixing from the pumping lights, and outputs a modulated uplink signal light. <P>COPYRIGHT: (C)2010,JPO&INPIT |
