Abstract: A large number of degrees for relays of optical signals transmitted via optical paths in the degrees is secured. A wavelength cross-connect device 20A performs a relay by splitting optical signals from respective degrees indicated by reference numerals 40l, 40h, 40m, 40q, each of the degrees being provided by optical fibers, via respective optical couplers and outputting the split optical signals to output sides of the plurality of degrees via respective WSSs 23a to 23d. As the optical couplers, variable couplers 27a to 27d whose respective splitting ratios, each of which is a ratio of optical signal power losses in splitting an optical signal, are variable are used. The wavelength cross-connect device 20A includes a control unit 26 that performs control to change the splitting ratios in such a manner as to eliminate an imbalance among OSNR margins of the output sides of the degrees in which a plurality of optical paths transmitting the split optical signals extend.

Abstract: The present invention is to provide a wavelength cross-connect device that reduces device costs. A wavelength cross-connect device 10B performs relaying for changing, using WSSs, routes of optical signals transmitted from M routes 1h to Mh, in which K optical fibers 1f to Kf are grouped for each of the routes, on an input side to output the optical signals to respective optical fibers 1f to Kf of M routes 1h to Mh on an output side. Input ports of each of the optical couplers 25a to 26d are connected to output ports of each of first WSSs 21a to 22k.

Abstract: The present invention is to provide an optical add/drop multiplexing device capable of realizing a configuration in which many transponders can be connected at low cost. An optical add/drop multiplexing device 30A includes branch function units 34a to 34d connected to each of WSSs 22a to 22d connected to respective routes 1 to D having a plurality of optical fibers and dropping optical signals having a plurality of wavelengths among the optical signals having the respective wavelengths transmitted by wavelength division multiplexing. The optical add/drop multiplexing device includes C-function units 35a to 35d configured to transmit the optical signals branched by the branch function units 34a to 34d to a plurality of transponders.

Abstract: [PROBLEM TO BE SOLVED] To uninterruptedly change a band of an optical transmission path in a line IF section, which relays a signal transmitted to an optical transmission path in a client IF section to which a communication terminal is connected, to the same band as a changed band in the client IF section without suspending the communication in the line IF section. [SOLUTION] An optical transmission system 10A performs processing for changing a band of an optical fiber 15 in a line IF section (L section) that relays a signal from an optical fiber 12 in a client IF section (C section) to the same band as that in the C section.

Abstract: [Problem] It is possible to cancel out beat noises in a WDM signal to obtain a high-quality signal component, and a configuration thereof is achieved with low mounting costs. [Solution] An optical reception device converts a WDM signal rs(t) of an optical signal to electrical signals d(t)1 to d(t)n expressed as complex numbers of orthogonal phases, cancels out beat noises from the electrical signals, and then demodulates the signals to obtain signals D1 to Dn of a transmission source.

Abstract: [Problem] whether optical input interruption detected by an OXC device is due to an external failure from an upstream side or an internal failure of the OXC device in a transponder device connected to the OXC device using an optical transmission line, and this determination is implemented at low cost. [Solution] An optical transmission system (10A) is configured by connecting a plurality of OXC devices (14A) using optical fibers (16) between transponder devices (15A1) that relay optical signals transmitted to/from terminals (19a, 19b). The OXC device (14A) includes an OSC part (4d1) and a monitoring control part (4e1). The OSC part (4d1) outputs wavelength information on an optical signal in which optical input interruption has occurred and path information on a path of an optical fiber (16) in which the optical input interruption has occurred, at the time of detecting the optical input interruption from the optical fiber (16).

Abstract: [Problem] In an optical transmission system, a position and a cause of a failure are identified while avoiding tightness of processing on a network controller side. [Solution] An optical transmission system 1 includes a plurality of nodes 4i to 4k interconnected by an optical transmission line, a plurality of node controllers 3i to 3k that detect degradation of signal quality at the nodes 4i to 4k, respectively, and determine a degradation mode correlated with the signal quality, and a network controller 2 that identifies a node or a component in which failure has occurred based on a node for which the node controller 3i to 3k has detected degradation of the signal quality, the degradation mode, a network topology formed of the nodes, and an optical path set between the nodes.

Abstract: [Problem] In estimation of an OSNR spectrum of a transmission line, the estimation is made with a small number of measurements and in a short period of time with accuracy maintained. [Solution] An OSNR spectrum estimation apparatus includes an OSNR estimation unit 11 configured to cause an optical node 2 to estimate an OSNR of a predetermined transmission line using a probe light of a predetermined wavelength in a predetermined number of wavelength channels, the predetermined number being less than the number of all wavelength channels; and an OSNR spectrum calculation unit 12 configured to calculate an OSNR spectrum of all the wavelength channels from OSNRs of the predetermined number of wavelength channels measured by the optical node 2.

Abstract: [PROBLEM TO BE SOLVED] To uninterruptedly change a band of an optical transmission path in a line IF section, which relays a signal transmitted to an optical transmission path in a client IF section to which a communication terminal is connected, to the same band as a changed band in the client IF section without suspending the communication in the line IF section. [SOLUTION] An optical transmission system 10A performs processing for changing a band of an optical fiber 15 in a line IF section (L section) that relays a signal from an optical fiber 12 in a client IF section (C section) to the same band as that in the C section.

Abstract: [Problem] It is possible to cancel out beat noises in a WDM signal to obtain a high-quality signal component, and a configuration thereof is achieved with low mounting costs. [Solution] An optical reception device converts a WDM signal rs(t) of an optical signal to electrical signals d(t)1 to d(t)n expressed as complex numbers of orthogonal phases, cancels out beat noises from the electrical signals, and then demodulates the signals to obtain signals D1 to Dn of a transmission source.

Abstract: [Problem] To improve the add/drop rates while suppressing the apparatus scale of the ROADM.

Abstract: The present invention includes a threshold value calculation unit that calculates a normal range that is a range of values that are taken when a steam trap is in a normal state, by using a predetermined calculation reference, based at least on state values with normal determination results, from among state values that have been stored in the storage unit during a predetermined period. A determination unit can perform predictive determination to determine whether the steam trap is in a normal state or a state that indicates an inclination toward a bad state and is highly likely to change to a bad state, by determining whether or not the state values are in the normal range, and the threshold value calculation unit performs accuracy determination to determine the accuracy of the predictive determination based on the results of the predictive determination regarding the state values stored in the storage unit, and adjusts the calculation reference based on the result of accuracy determination.

Abstract: When separate service apparatuses that provide various communication services to users are connected by a wiring with communication functional units interposed, if there is a wiring abnormality, the location of the abnormality is easily identified. When a wiring connection is completed between separated service apparatuses X and Y that provide various communication services to user terminals 31 and 32 with communication functional units A1 and B2 interposed, a wiring management system 10A includes a transmission network management apparatus 14A that identifies a wiring abnormality. The transmission network management apparatus 14A associates endpoint names of the service apparatuses X and Y and of the functional units A1 and B2 with opposite endpoint names on the opposite sides, defines opposite endpoint IDs of the endpoints of the functional units A1 and B2 as expected values, and saves the end points in association with the opposite endpoint IDs in a DB 14b.

Abstract: A demand responsive operation system includes: a user terminal; an on-demand vehicle that operates based on a use request from the user terminal; and an operation management center that manages an operation of the on-demand vehicle. The operation management center includes a use receiver and an operation plan generator. The use receiver receives the use request from the user terminal. The operation plan generator generates an operation plan within a permissible range of a reference operation schedule based on the reference operation schedule and the use request received by the use receiver, the reference operation schedule having an operation section, a departure place departure time and a final destination arrival time preset, and provides the generated operation plan to the on-demand vehicle and the user terminal. The user terminal presents this operation plan to a user, and the on-demand vehicle operates according to this operation plan.

Abstract: Provided is an information collection method in an information collection apparatus that communicates with at least a first information provision apparatus and a second information provision apparatus via a network. The information collection method includes transmitting, when the information collection apparatus has received first information associated with an incident from the first information provision apparatus, second information corresponding to the first information to at least the second information provision apparatus. Further, the information collection method includes receiving by the information collection apparatus third information associated with the incident from the second information provision apparatus having received the second information.

Abstract: An information management device includes a difference extractor and a determination unit. The difference extractor extracts, as difference information, vehicle peripheral three-dimensional information detected by a vehicle and three-dimensional map information. The determination unit determines whether the extracted difference information is a difference inherent to the vehicle.

Abstract: A demand responsive operation system includes: a user terminal; an on-demand vehicle that operates based on a use request from the user terminal; and an operation management center that manages an operation of the on-demand vehicle. The operation management center includes a use receiver and an operation plan generator. The use receiver receives the use request from the user terminal. The operation plan generator generates an operation plan within a permissible range of a reference operation schedule based on the reference operation schedule and the use request received by the use receiver, the reference operation schedule having an operation section, a departure place departure time and a final destination arrival time preset, and provides the generated operation plan to the on-demand vehicle and the user terminal. The user terminal presents this operation plan to a user, and the on-demand vehicle operates according to this operation plan.

Abstract: A maintenance support system for a plurality of maintenance-target apparatus in a plant includes a maintenance information delivery unit that delivers maintenance information Im that indicates an operational status of each maintenance-target apparatus to maintenance personnel every preset time T, wherein the maintenance information delivery unit delivers predictive information If to the maintenance personnel at a specified time Tf between the previous delivery of the maintenance information Im and the next delivery of the maintenance information Im, the predictive information If providing predictions regarding the operational status of each maintenance-target apparatus at the next delivery of the maintenance information Im.

Abstract: The present invention includes a threshold value calculation unit that calculates a normal range that is a range of values that are taken when a steam trap is in a normal state, by using a predetermined calculation reference, based at least on state values with normal determination results, from among state values that have been stored in the storage unit during a predetermined period. A determination unit can perform predictive determination to determine whether the steam trap is in a normal state or a state that indicates an inclination toward a bad state and is highly likely to change to a bad state, by determining whether or not the state values are in the normal range, and the threshold value calculation unit performs accuracy determination to determine the accuracy of the predictive determination based on the results of the predictive determination regarding the state values stored in the storage unit, and adjusts the calculation reference based on the result of accuracy determination.

Abstract: An information management device includes a difference extractor and a determination unit. The difference extractor extracts, as difference information, vehicle peripheral three-dimensional information detected by a vehicle and three-dimensional map information. The determination unit determines whether the extracted difference information is a difference inherent to the vehicle.