Abstract: A correction system (1) according to the present disclosure includes: an optical fiber sensing apparatus (101) configured to receive an optical signal from an optical fiber (200), and acquire sensed data from the optical signal; an analysis apparatus (102) configured to analyze an analysis target based on the sensed data; an absolute value acquisition apparatus (103) configured to acquire an absolute value of the analysis target; and a correction apparatus (104) configured to correct an analysis result for the analysis target from the analysis apparatus (102), based on the absolute value of the analysis target.

Abstract: Provided is a portable device which make it possible to facilitate analysis, in cooperation with an external system, on data obtained by optical fiber sensing. A portable device comprises: a sensing unit configured to execute optical fiber sensing using an optical fiber cable; an analysis unit configured to execute primary analysis processing on sensing data obtained by the optical fiber sensing; a communication unit configured to transmit data containing the results of the primary analysis processing to an external analysis unit configured to execute, outside the portable device, secondary analysis processing based on the results of the primary analysis processing; and a housing which accommodates the sensing unit, the analysis unit, and the communication unit.

Abstract: The purpose of the present disclosure is to detect the occurrence of engineering work in the surroundings of a utility pole or a pylon using a simple configuration. This engineering work detection device comprises: an optical signal reception unit for receiving an optical signal from an optical fiber cable installed by a method of overhead installation via a utility pole or a pylon; and at least one memory configured to store instructions; and at least one processor configured to execute the instructions to detect, on the basis of a pattern of vibration of the utility pole or the pylon indicated by the optical signal, the occurrence of engineering work in the surroundings of the utility pole or the pylon.

Abstract: Provided are a data processing device, etc. that makes it possible to measure an object between adjacent positions where measurement instruments are installed. A data processing device comprises: at least one memory configured to store instructions; and at least one processor configured to execute the instructions to acquire, from each measurement instrument installed at different measurement positions, measurement data indicating results of measuring an object, to acquire sensing data from an optical fiber cable laid so as to pass through each of the different measurement positions, and to use the sensing data to interpolate measurement data.

Abstract: Provided are a spatial sensing device, and the like, that are suitable for spatial sensing. This spatial sensing device (3) comprises a sensing data acquisition means (11) for acquiring sensing data through optical fiber sensing using a plurality of optical fiber cables (1) laid in different directions and an object detection means (12) for using the sensing data to detect the position of an object in a space of interest.

Abstract: Provided are a lightning stroke detection device, etc., whereby the occurrence of a lightning stroke can be detected by a simple system configuration. A lightning stroke detection device (4) comprises an optical signal reception means (12) for receiving an optical signal including sensing information from an optical fiber network (3) for detecting the sensing information, and a lightning stroke detection means (13) for using the sensing information included in the optical signal to detect the occurrence of a lightning stroke in the optical fiber network, the sensing information indicating at least a vibration pattern of the lightning stroke, and the lightning stroke detection means (13) detecting the occurrence of a lightning stroke on the basis of the vibration pattern.

Abstract: The optical fiber sensing system includes: a host sensing device including a first optical sensor for receiving, from a first optical fiber, first light corresponding to first pulse light input into the first optical fiber and first signal light and outputting first data for the first optical fiber corresponding to the first light and second data included in the first signal light, and a first data communicator for outputting a data signal including the first data and second data; and a remote sensing device including a second optical sensor for receiving, from a second optical fiber, second light that corresponds to second pulse light input into the second optical fiber and outputting second data including sensing results for the second optical fiber corresponding to the second light, and a second data communicator for outputting, to the first optical fiber, first signal light including the second data.

Abstract: A position specifying system according to the present disclosure includes: a position information acquisition unit (31) that acquires position information; a vibration generation unit (32) that generates vibration including the position information; an optical fiber (10) that detects the vibration; a communication unit (21) that receives an optical signal including the position information included in the vibration; a distance specifying unit (22) that specifies, based on the optical signal, a distance of the optical fiber (10) from a location of the communication unit (21) to a location where the optical fiber (10) detects vibration; and a position specifying unit (23) that specifies, based on the optical signal, the position information included in the optical signal and stores the distance and the position information in association with each other.

Abstract: An optical fiber sensing system according to the present disclosure includes an optical fiber network (10) that detects sensing data, a communication unit (21) that receives an optical signal from the optical fiber network (10), an identification unit (22) that identifies status information appropriate to a service providing destination from among a plurality of pieces of status information, an analysis unit (23) that analyzes the identified status information, based on sensing data superimposed on the optical signal, by using an analysis method related to the identified status information among a plurality of analysis methods, and a providing unit (24) that provides the identified status information to the service providing destination.

Abstract: A deterioration discrimination system according to the present disclosure includes: an optical fiber cable (20) configured to be laid in a utility pole (10); a communication unit (31) configured to receive an optical signal from optical fibers (21) included in the optical fiber cable (20); a detection unit (32) configured to detect, based on the optical signal received by the communication unit (31), vibrations that are generated in the utility pole (10); and a discrimination unit (41) configured to discriminate, based on a vibration frequency of the vibrations that are generated during a specified period among the vibrations that are detected by the detection unit (32), deterioration of the utility pole (10).

Abstract: An optical fiber sensing system according to the present disclosure includes: an optical fiber network (10) configured to detect first sensing information related to a first monitoring target and second sensing information related to a second monitoring target; a reception unit (21) configured to receive an optical signal from the optical fiber network (10); a specification unit (22) configured to specify a first monitoring target based on first sensing information superimposed on the optical signal and specify a second monitoring target based on second sensing information superimposed on the optical signal, and a provision unit (23) configured to provide information related to the first monitoring target and information related to the second monitoring target specified by the specification unit (22) for a service providing destination.

Abstract: A detection system according to the present disclosure includes an optical fiber (10X, 10Y) laid in a portable base station area (45) in which a portable base station (40) is installed, a reception unit (20) receiving an optical signal from the optical fiber (10X, 10Y), the optical signal containing information indicating a state of the portable base station area (45), and a detection unit (32) detecting a threat in the portable base station area (45), based on the information indicating a state of the portable base station area (45) being contained in the optical signal.

Abstract: A monitoring system according to the present disclosure includes: an optical fiber (10) configured to sense a peripheral environmental state, a monitor's terminal (40), a receiving unit (20) configured to receive an optical signal containing information indicating the environmental state from the optical fiber (10), a detecting unit (32) configured to detect at least one of an accident and an incident, based on the information indicating the environmental state, being included in the optical signal, and a broadcasting unit (33) configured to broadcast that the accident or the incident has occurred to the monitor's terminal (40) when the detecting unit (32) determines that the accident or the incident has occurred.

Abstract: An optical fiber sensing system according to this disclosure includes: a first optical fiber network (10A) configured to detect first sensing information about a monitoring target; a second optical fiber network (10B) configured to detect second sensing information about the monitoring target; a first reception unit (21A) configured to receive a first light signal from the first optical fiber network (10A); a second reception unit (21B) configured to receive a second light signal from the second optical fiber network (10B); and an identification unit (22) configured to identify the monitoring target, based on the first sensing information included in the first light signal, and the second sensing information included in the second light signal.

Abstract: In order to promptly switch a wavelength of local light in conjunction with switching of a wavelength of signal light, a coherent optical receiver includes a signal light divergence unit for causing signal light to diverge to first signal light and second signal light; a local oscillation light source for generating local oscillating light (local light); an optical phase hybrid unit for causing the first signal light to interfere with the local light and outputting interference light; and a wavelength detection unit for receiving the second signal light, detecting a wavelength of the signal light on the basis of the second signal light, and thereby controlling a wavelength of the local light generated by the local oscillation light source.

Abstract: A bidirectional wavelength division multiplex transmission apparatus includes first and second optical circulators, an optical amplifier, and a demultiplexing unit. The first optical circulator is connected to a first optical transmission line to branch/insert reverse and forward wavelength division multiplex optical signals having different wavelengths. The second optical circulator is connected to a second optical transmission line to branch/insert reverse and forward wavelength division multiplex optical signals having different wavelengths. The multiplexer performs wavelength division multiplexing of the signals from the optical circulators. The optical amplifier amplifies the optical signal output from the multiplexer. The demultiplexing unit demultiplexes the optical signal amplified by the optical amplifier on the basis of the wavelengths, and outputs the demultiplexed optical signal to one of the first and second optical transmission lines.

Abstract: An optical transmitter system includes a semiconductor laser, an external modulator, a detector and a frequency-modulation controller. The semiconductor laser transmits an optical signal of a predetermined wavelength onto an optical fiber and a backscattering wave caused by the optical signal is detected by the detector. The frequency-modulation controller controls the semiconductor laser so that the amplitude of a frequency-modulation signal applied to the semiconductor laser is varied depending on a detection signal of the backscattering wave.

Abstract: In an optical amplifying device, an optical direct amplifier (11) amplifies input optical signals subjected to wavelength division multiplexing (WDM). A beam splitter (12) splits the amplified WDM signals into two. An optical filter (13A) separates a particular optical signal from one of the two outputs of the beam splitter (12). An optoelectrical converter (14) converts the separated optical signal to a corresponding electric signal. A gain controller (15) controls the gain of the direct amplifier (11) on the basis of the electric signal output from the converter (14). The optical filter 13A may be replaced with an optical variable filter (13B) and controlled by control means when the optical signal for gain control is shut off or sharply varied in wavelength. Because the gain of the direct amplifier (14) is controlled by use of particular one of the plurality of WDM signals, the individual optical signal is controlled to a preselected level even when the number of WDM signals is changed.

Abstract: In an optical transmitter and receiver device, a transmitter receives a transmitting data signal and drives a laser diode to make the laser diode emit an optical data signal representative of the transmitting data signal. The laser diode simultaneously emits a backward optical leakage signal. A photodiode is disposed at a rear side of the laser diode and detects the backward optical leakage signal as an optical monitoring signal to produce an electric monitoring signal. The transmitter receives the electrical monitoring signal to control an output power of the laser diode at a stabilized level. When the transmitter receives no transmitting data signal, the laser diode functions as an optical amplifier for an incoming optical data signal thereto and delivers an amplified optical data signal to the photodiode. The photodiode converts the amplified optical data signal to an electrical reception signal.