| 摘要 |
PROBLEM TO BE SOLVED: To avoid a phenomenon in which the communication accuracy of single photon communication is not maintained and the cause of which is unknown in the case where a plurality of optical fibers were laid.SOLUTION: A stray light countermeasure system includes: a first optical fiber 11 through which a photon propagates; and a second optical fiber 12 adjacent to the first optical fiber. This system includes a stray light detection device 13 and a photon wavelength determination device 14. The stray light detection device 13 is a device to detect stray light having leaked from the second optical fiber and having penetrated into the first optical fiber. The photon wavelength determination device 14 is a device to obtain the wavelength of the photon used in the first optical fiber 11 by using information about the stray light detected by the stray light detection device 13. Because the stray light detection device 13 measures the stray light travelling from the second optical fiber 12 to the first optical fiber and the photon wavelength determination device 14 can determine a wavelength at which influence of the stray light is small, the stray light countermeasure system can perform information communication by use of the photon with the wavelength at which influence of such stray light is small. |
