Provided is a multicore fiber containing a plurality of cores, wherein when the multicore fiber is bent to form a curve with a diameter of 280 mm, the optical propagation loss in a mode one order higher than an optical mode used for information transmission in the optical wavelength band used for the information transmission is set between 1 dB/m and 0.02 dB/m inclusive. Thus, unnecessary light in a higher order mode can be sufficiently attenuated within propagation of 1 km. Thereby, even if unnecessary light is created in a higher order mode at a contact point between fibers, the unnecessary light in the higher order mode can be sufficiently attenuated before the next contact point.
|Country/Territory||International Bureau of the World Intellectual Property Organization (WIPO)|
|Publication status||Published - 2017|