| 摘要 |
Provided is an optical transmission system using four-wave mixing which is configured in a WDM-PON topology where a signal light between an optical line terminal 11 and each of optical network units 13-1, . . . , 13-N is multi/demultiplexed at a WDM 12. The optical line terminal 11 transmits downlink signal light having wavelengths lambdad1, . . . , lambdadN and pumping lights having wavelengths lambdap1, . . . , lambdapN which are different by a predetermined wavelength difference Deltalambda from the wavelengths of the downlink signal lights in a downward direction, that is, in a direction toward the optical network units 13-1, . . . , 13-N. Each of the optical network 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 optical network unit to the optical line 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.
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