| CPC G01D 5/35358 (2013.01) [G01H 9/004 (2013.01)] | 17 Claims |
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1. A cable system using a cable including a plurality of optical fibers for optical fiber sensing of an environment surrounding the cable, the cable system comprising
an optical amplification repeater configured to compensate for transmission loss including loss in the optical fibers,
wherein the optical fiber sensing is sensing in which probe light, which is transmitted light used for the optical fiber sensing, is transmitted through one of the optical fibers and backscattered light that is related to the probe light and arrives from the optical fiber is received and analyzed,
to at least one end of the cable, a transceiver for sensing that performs configured to perform the optical fiber sensing is connected, and
in the optical fiber having a function of the optical fiber sensing,
when there is a first wavelength band in which a wavelength of an optical signal used for a use other than the sensing is assigned, the first wavelength band and a second wavelength band that is a wavelength of the probe light and the backscattered light are arranged in such a way as to be different from each other,
an optical amplifier included in the optical amplification repeater, the optical amplifier configured to perform amplification and repeat of light transmitted through the optical fiber having a function of the optical fiber sensing, includes a first amplifier and a second amplifier configured to amplify rays of light propagating in opposite directions to each other, and
each of the probe light and the backscattered light is amplified by one of the first amplifier and the second amplifier.
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