Abstract: In order to quickly estimate an abnormal transponder at low cost, a network monitoring device acquires, when sensing a failure occurrence channel, route information of the failure occurrence channel. The network monitoring device generates an adjacent channel table in which an adjacent channel being close in wavelength to the failure occurrence channel is extracted, then generates an interference channel table in which an interference channel sharing a common route with the failure occurrence channel among the adjacent channels is extracted, and then performs weighting on the interference channel, based on closeness of wavelength to the failure occurrence channel, and generates an influence channel table in which a weight is given to the interference channel. The network monitoring device estimates, based on the influence channel table, a channel with a large weight to be a channel having a possibility of exerting a negative influence on the failure occurrence channel.

Abstract: It is necessary to reduce the power consumption of a plurality of optical amplifiers when there is a difference in the required pumping power between the plurality of optical amplifiers; therefore, an optical amplifying apparatus according to an exemplary aspect of the invention includes a plurality of optical amplifying means for amplifying a plurality of optical signals, each of the plurality of optical amplifying means including a gain medium; a plurality of laser light generating means for generating a plurality of laser beams; at least one optical coupling means for coupling the plurality of laser beams variably in accordance with a coupling factor and outputting a plurality of excitation light beams, each of the plurality of excitation light beams exciting the gain medium; and controlling means for controlling the coupling factor and an output power of each of the plurality of laser light generating means.

Abstract: A submarine optical communication system control device (1) according to the present invention includes: a light intensity distribution determination device (2) configured to determine an optimum distribution of signal light intensity of each optical path for each allocated frequency; a light intensity distribution measuring device (3) configured to measure a light intensity distribution of an optical path after transmission through a submarine cable transmission line; an equalization setting calculation unit (4) configured to calculate a gain equalization setting for compensating for the difference between an optimum distribution in the light intensity distribution determination device and a measured distribution in the light intensity distribution measuring device; and a variable gain equalizer (5) configured to compensate for a light intensity distribution of an optical path to the optimum distribution, based on a gain equalization setting in the equalization setting calculation unit.

Abstract: Provided are a low-cost and low power-consumption optical fiber amplifier, an optical fiber amplifier control method, and a transmission system. The optical fiber amplifier comprises: an optical fiber to which pumping light is supplied and which amplifies an optical signal, the optical fiber including a plurality of cores in a cladding; a light source which outputs the pumping light; a combining means which supplies the pumping light from the light source to the cladding of the optical fiber and causes the pumping light to be combined with the optical signal; a collect means which collects, without collecting the signal light, pumping light among the supplied pumping light that has not been absorbed by the optical fiber; a monitor means which monitors residual pumping light that has passed through the optical fiber and collected by the collect means; and a control means which controls the state of the pumping light.

Abstract: This optical path setting device comprises: a transmission characteristic calculating means for calculating an inter-endpoint transmission characteristic that is a characteristic for transmission between endpoints of an optical path accommodating traffic in a plurality of optical communication systems; a required wavelength bandwidth determining means for determining a required wavelength bandwidth that is a wavelength bandwidth meeting an arrival performance of the optical path on the basis of the inter-endpoint transmission characteristic; and an accommodating wavelength band determining means for determining, as an accommodating wavelength band for accommodating the optical path, a common wavelength band that is a wavelength band where an optical path having the required wavelength bandwidth can be allocated, and that is common to the plurality of optical communication systems.

Abstract: Provided are an optical communication device and an optical communication system capable of preventing the costs of equipment from increasing for an optical communication network constructed including devices provided by different vendors or devices of different generations.

Abstract: To solve the problem that the power consumption of optical amplifiers is not optimized over the life time of an amplifier, the optical amplifier includes a gain medium for amplifying a plurality of optical channels, the gain medium including a plurality of cores through which the plurality of optical channels to propagate respectively and a cladding area surrounding the plurality of cores, a monitor that monitors the temperature of the optical amplifier and producing a monitoring result, a first light source that emits a first light beam to excite the cladding area, a second light source that emits a plurality of second light beams to excite each of the plurality of cores individually, and a controller that controls the first light source and the second light source based on the produced monitoring result.

Abstract: A packet communication device autonomously selects an appropriate operation mode according to a connection environment to an external device before a service of the device is started. When the device is connected to the external buses, connection interface units notify an external device discrimination unit of connection of the device. The external device discrimination unit issues a polling packet to the connected device, discriminates the connected external device on the basis of the response packet, and notifies an operation mode switching unit. The operation mode switching unit selects an operation mode conforming to a connection environment of the packet communication device to the external device and switches the operation mode of the device to the mode.

Abstract: An optical backplane connector with a board removable (being possible to insert and remove) therein in the direction perpendicular to the backplane plate surface is arranged on a backplane having optical transmission paths. The optical backplane connector accommodates a photoelectric conversion module in such a manner the incident and exit light are perpendicular to the backplane and a transparent board with a photoelectric conversion element mounted thereon is perpendicular to the board and parallel to the backplane. The conduction between the electric contacts of the photoelectric conversion module and the inner electric contacts of the optical backplane connector is held by mechanical contact. At the end portion of the optical transmission path on the backplane, an optical connector having a 45? mirror and guide pins is mounted. The positioning operation is achieved by fitting the guide pins of the optical connector with the guide holes of the photoelectric conversion module.

Abstract: In a communication system using a parallel transmission, in order to provide a technology for an efficient transmission, a transmission device includes a data amount detection means for detecting a data amount of inputted data, a plurality of transmission means for transmitting the data in parallel, and a data allocation means for allocating the inputted data to the transmission means selected from the plurality of transmission means based on the data amount and a transmission capacity of the transmission means.

Abstract: A switch device is composed of a switch portion 1-1, input side port mapping blocks 1-4-1 to 1-4-P, output side port mapping blocks 1-5-1 to 1-5-P, and a virtualization controller (central controller) 1-0 so that the switch device can be logically divided into a plurality of switches each having a capacity smaller than a physical switch capacity or the divided switches can be logically integrated. The switch portion has a plurality of first input ports and a plurality of first output ports. Each of the input side port mapping blocks has a plurality of second input ports and inputs the signals input to the plurality of second input ports to the first input ports of the switch portion. Each of the output side port mapping blocks has a plurality of second output ports and outputs the signals output to the first output ports of the switch portion from the plurality of second output ports.

Abstract: A connection structure includes housing (10) having insertion/removal openings (11a, 12a) into which and from which a plurality of CPU cards (6), in which electronic parts are mounted on a circuit board, and switch cards (7) are inserted and removed, back plane (13) to which cards (6, 7) are electrically connected, and optical circuit board (14) that is optically connected to optical connectors (16) which are arranged on cards (6, 7) so as to be exposed to the outside of housing (10) from insertion/removal openings (11a, 12a) with cards (6, 7) connected to back plane (13).

Abstract: An optical backplane connector with a board removable (being possible to insert and remove) therein in the direction perpendicular to the backplane plate surface is arranged on a backplane having optical transmission paths. The optical backplane connector accommodates a photoelectric conversion module in such a manner the incident and exit light are perpendicular to the backplane and a transparent board with a photoelectric conversion element mounted thereon is perpendicular to the board and parallel to the backplane. The conduction between the electric contacts of the photoelectric conversion module and the inner electric contacts of the optical backplane connector is held by mechanical contact. At the end portion of the optical transmission path on the backplane, an optical connector having a 45? mirror and guide pins is mounted. The positioning operation is achieved by fitting the guide pins of the optical connector with the guide holes of the photoelectric conversion module.

Abstract: A switch device is composed of a switch portion 1-1, input side port mapping blocks 1-4-1 to 1-4-P, output side port mapping blocks 1-5-1 to 1-5-P, and a virtualization controller (central controller) 1-0 so that the switch device can be logically divided into a plurality of switches each having a capacity smaller than a physical switch capacity or the divided switches can be logically integrated. The switch portion has a plurality of first input ports and a plurality of first output ports. Each of the input side port mapping blocks has a plurality of second input ports and inputs the signals input to the plurality of second input ports to the first input ports of the switch portion. Each of the output side port mapping blocks has a plurality of second output ports and outputs the signals output to the first output ports of the switch portion from the plurality of second output ports.

Abstract: An intra-housing optical communication system includes card slots 61 to 64 and at least a concentrate slot and conducts the optical communication between the slots, wherein the optical wires between the card slots are connected by using an optical fiber sheet or the like to simplify the wiring and reduce the size of the housing. The concentrate slots include an optical wiring change unit 6 for changing the form of connection between the card slots, thereby making it possible to easily change the form of connection to the desired shape (mesh, ring, etc.). Also, the optical terminals of the optical connectors are shared by a plurality of the slots and thus made available for use among the optical connectors.

Abstract: A packet communication device autonomously selects an appropriate operation mode according to a connection environment to an external device before a service of the device is started. When the device is connected to the external buses, connection interface units notify an external device discrimination unit of connection of the device. The external device discrimination unit issues a polling packet to the connected device, discriminates the connected external device on the basis of the response packet, and notifies an operation mode switching unit. The operation mode switching unit selects an operation mode conforming to a connection environment of the packet communication device to the external device and switches the operation mode of the device to the mode.

Abstract: An optical switching subsystem comprising; a plurality of input optical ports for inputting an optical signal, a plurality of output optical ports for outputting the optical signal, an optical switch formed by a micro electromechanical system (MEMS) for switching an optical path among said input optical ports and said output optical ports, a controller for instructing said optical switch to execute switching operation, and self-diagnosis means for measuring performance characteristics of said optical switching subsystem and diagnosing said optical switching subsystem based upon said performance characteristics.

Abstract: A wavelength multiplexed signal transmitted through an inter-node transmission path is demultiplexed to a wavelength band by a first optical demultiplexer and after having its path changed by a first matrix switch, the obtained signal is again wavelength-multiplexed by a first optical multiplexer and then output to the inter-node transmission path. On the other hand, signals to be subjected to processing on a wavelength basis are demultiplexed on a wavelength basis by a second optical demultiplexer capable of demultiplexing an arbitrary wavelength band through a link and after having their paths changed by a second matrix switch, the obtained signals are again multiplexed to a wavelength band by a second optical multiplexer, subjected to the same processing as that of the above-described wavelength band and output to the inter-node transmission path.

Abstract: An object of the present invention provides an inexpensive three-stage switching system which performs detailed switching at a packet level in a manner similar to packet switching while satisfying a non-blocking condition. By deciding a number m of output lines in each switch of an input-stage switch block and the number m of input lines in each switch of an output-stage switch block such that m≧2n−1+k−1 will be satisfied, it is possible to construct the input-stage switch block and output-stage switch block by switches for detailed packet-level switching and construct the intermediate-stage switch block with a large number of switches by single-function switches which perform only circuit switching.

Abstract: In a positioning control device of a positioning servo system for which the object of control is both secondary and has observable states and having a servo compensator that inputs position data and compensates, a normalized trajectory generator that generates an arbitrary normalized trajectory based on position data, and an initial value setting device, the initial values of the servo compensator are reset to minimize the square-law integral value used as the cost of the deviation of the position of the object of control from the normalized trajectory of the normalized trajectory generator.