Optical fiber sensing system, measuring device, and measuring method

A measuring device comprising:

• an interrogator configured to perform an optical fiber sensing function added to a long-range optical communication cable system including an optical amplification relay device by sending probe light to an optical fiber, detecting backscattered light of the probe light, and performing sensing on environmental information around the optical fiber;
• a first sensing device installed at a remote place different from a terminal station of the optical communication cable system;
• and
• a second sensing device installed at the terminal station, and configured to communicate with the first sensing device,
• wherein the first sensing device comprises:
• the interrogator;
• a power source unit configured to receive power via the optical communication cable system and supply power to the first sensing device;
• and
• a communication unit configured to communicate with the second sensing device,
• wherein the interrogator is configured to generate sensing data at each point on the optical fiber by performing sensing on environmental information around the optical fiber, which is connected to the first sensing device,
• wherein the communication unit is configured to transmit the sensing data to the second sensing device,
• wherein the first sensing device comprises a housing separated from a plurality of optical amplification relay devices connected to the optical communication cable system via a cable,
• wherein the first sensing device is connected to the cable,
• wherein a communication service wavelength of the optical communication cable system, a wavelength at which the first sensing device and the second sensing device communicate with each other, and a wavelength of the probe light and the backscattered light are different from one another, and
• wherein the first sensing device is configured such that:
• the probe light and the backscattered light are wavelength multiplexed and demultiplexed and propagate in a predetermined direction in the predetermined optical fiber in the cable,
• light for communicating with the second sensing device is wavelength multiplexed and demultiplexed and propagates in a predetermined direction in a predetermined optical fiber in the cable, and
• through-connection is made on an optical fiber other than an optical fiber through which the probe light, the backscattered light, and light for communicating with the second sensing device propagate, among a plurality of optical fibers in the cable.

A measuring method in to optical communication cable system comprising:

• by a first sensing device, which is installed at a remote place different from a terminal station of an optical fiber sensing system acquired by adding an optical fiber sensing function to a long-range optical communication cable system including an optical amplification relay device, receiving power via the optical communication cable system;
• supplying power to the first sensing device;
• by an interrogator installed in the first sensing device, performing operations comprising:
• generating sensing data at each point on an optical fiber, which is connected to the first sensing device by sending probe light to the optical fiber;
• detecting backscattered light of the probe light;
• and
• performing sensing on environmental information around the optical fiber;
• transmitting the sensing data to a second sensing device installed at the terminal station;
• separating a housing of the first sensing device from a plurality of optical amplification relay devices connected to the optical communication cable system via a cable;
• connecting the first sensing device to the cable;
• setting a communication service wavelength of the optical communication cable system, a wavelength at which the first sensing device and the second sensing device communicate with each other, and a wavelength of the probe light and the backscattered light to be different from one another;
• and
• by the first sensing device, performing operations comprising:
• wavelength multiplexing and demultiplexing the probe light and the backscattered light and propagating the probe light and the backscattered light in a predetermined direction in the predetermined optical fiber in the cable;
• wavelength multiplexing and demultiplexing light for communicating with the second sensing device and propagating the light in a predetermined direction in a predetermined optical fiber in the cable;
• and
• making through-connection on an optical fiber other than an optical fiber through which the probe light, the backscattered light, and light for communicating with the second sensing device propagate, among a plurality of optical fibers in the cable.