Abstract: A communication device may include: a memory configured to store management information in which, for each of a plurality of OIDs of a MIB, the OID and a setting value are associated with each other; and a controller, wherein the controller may be configured to: receive a setting command which conforms to TCP; write the setting value included in the setting command to the management information in association with the OID included in the setting command; and send a response command which conforms to the TCP. In a case where the setting command including a first OID and a first setting value is received, the controller may be configured to: write the first setting value to the management information in association with the first OID after the response command has been sent, and send the response command before the first setting value is written to the management information.

Abstract: An image processing apparatus includes a first acquisition unit configured to acquire a first feature amount from a first image based on a first trained model configured to extract a feature from an image, a second acquisition unit configured to acquire a second feature amount from a second image based on a second trained model determined based on a state of the second image and configured to extract a feature from an image, and a verification unit configured to determine, based on the first feature amount and the second feature amount, whether an object in the first image and an object in the second image are the same. The second trained model is a model having learned the second feature amount in a same feature space as that for the first trained model.

Abstract: This invention provides an optical communication apparatus in which the nonlinear degradation of a wavelength multiplexed signal in the nonlinear degradation factor member causing the nonlinear degradation is reduced, an optical transmission system using the same, and a method for reducing the nonlinear degradation. There are provided a wavelength interval enlarging portion 51 for enlarging a wavelength interval of an inputted wavelength multiplexed signal, a nonlinear degradation incidental processing portion 52 for applying arbitrary processing involving the nonlinear degradation to the wavelength multiplexed signal whose wavelength interval is enlarged, and a wavelength interval recovering portion 53 for recovering the wavelength interval of the wavelength multiplexed signal to which the arbitrary processing is applied to the original wavelength interval.

Abstract: An optical transmission system includes an optical signal transmitter to output optical signal, a monitoring light transmitter to generate monitoring light, an optical multiplexer to output a multiplexed signal light by multiplexing the optical signal and monitoring light, an optical relay transmission path to amplify the multiplexed signal light by using a Raman amplification effect, an optical demultiplexer to demultiplex the multiplexed signal light, a monitoring light receiver to receive the monitoring light output from the optical demultiplexer, and a pumping light source stopping device to continuously monitor a transmission state of the monitoring light and, when the transmission of the monitoring light is interrupted, to stop emission of the pumping light from the pumping light source to be used for distributed Raman amplification.

Abstract: An optical transmission system includes an optical signal transmitter to output optical signal, a monitoring light transmitter to generate monitoring light, an optical multiplexer to output a multiplexed signal light by multiplexing the optical signal and monitoring light, an optical relay transmission path to amplify the multiplexed signal light by using a Raman amplification effect, an optical demultiplexer to demultiplex the multiplexed signal light, a monitoring light receiver to receive the monitoring light output from the optical demultiplexer, and a pumping light source stopping device to continuously monitor a transmission state of the monitoring light and, when the transmission of the monitoring light is interrupted, to stop emission of the pumping light from the pumping light source to be used for distributed Raman amplification.

Abstract: An optical transmission system capable of immediately stopping optical equipment which may emit a high-power output optical signal from the breaking point of a transmission line fiber. A control circuit has the first function of controlling an optical amplifier based on an optical supervisory channel received by an optical supervisory channel receiver. In addition, the control circuit has the second function of determining that the breaking of an optical fiber or the like has occurred when the strength of an optical supervisory channel received by an optical supervisory channel receiver is equal to or lower than a prescribed level and terminating the transmission of an optical signal through a line via the optical amplifier. With the second function, it is possible to prevent the emission of a high-power output optical signal from the breaking point of the optical fiber.

Abstract: The present invention includes a sheet material, a first optical fiber, a second optical fiber optically coupled to the first optical fiber in portions thereof, and an optical fiber coupler constituted in the portions where the two optical fibers are coupled, and those of the first and second optical fibers, and the optical fiber coupler are integrally held in the sheet material.

Abstract: An optical fiber amplifying apparatus is provided with an optical fiber for amplifying input signal lights, a heating/cooling element for heating or cooling the optical fiber, and a temperature control circuit for controlling the element. The circuit effects control so as to keep the optical fiber at a prescribed temperature on the basis of the output of a temperature sensor. The circuit also controls the heating/cooling element so as to keep the level(s) of at least one signal light extracted out of wavelength-multiplex signal lights at a prescribed value. The circuit can compute the gain from the input and output levels of one or more signal lights, and control the element so as to keep this gain within a prescribed range.

Abstract: The present invention includes a sheet material, a first optical fiber, a second optical fiber optically coupled to the first optical fiber in portions thereof, and an optical fiber coupler constituted in the portions where the two optical fibers are coupled, and those of the first and second optical fibers, and the optical fiber coupler are integrally held in the sheet material.

Abstract: Disclosed is a method for wavelength-multiplexing signal lights with three or more wavelengths, wherein: a wavelength arrangement is made by providing at least a wavelength block of signal light with one wavelength and a wavelength block where signal lights with two or more wavelengths are wavelength-multiplexed or providing a plurality of wavelength blocks where signal lights with two or more wavelengths are wavelength-multiplexed, and by setting a wavelength interval between adjacent wavelength blocks to be wider than a wavelength interval between signal lights in a wavelength block.

Abstract: An optically amplifying device with a gain equalizing function comprises: an optical fiber amplifier for receiving, as an input, a wavelength division multiplexed signal light beam which has been obtained by wavelength-division multiplexing a plurality of signal light beams having different wavelengths to output the amplified signal light beam containing the plurality of signal light beams, which is obtained by optically amplifying the wavelength division multiplexed signal light beam; and a gain equalizer for receiving, as an input, the amplified signal light beam to optically amplify the plurality of signal light beams thus amplified to equalize the optical output levels thereof, thereby outputting the equalized amplified signal light beams.

Abstract: Disclosed is an optical amplification device comprising a pulser for pulsing a multi-channel signal which has been wavelength division multiplexed; a pulse signal disperser for dispersing the pulsed signal at each wavelength and outputting a dispersed pulse signal; and an optoelectronic converter for converting the dispersed pulse signal to an electrical signal. The number of channels of a multi-channel signal can be counted by counting the number of peaks in a time waveform of the electrical signal. The pulse signal disperser can be realized by using a high dispersion medium having high wavelength dispersion. The pulser can be realized by using an optical switch utilizing a mechanical, acousto-optical or electro-optical effects. The optical signal channel counter can be applied in an optical amplification device and stable optical amplification can be performed by counting the number of channels of an inputted optical signal and outputting pump light in compliance with said number of channels.

Abstract: The electronic apparatus of the present invention can easily retrieve data transmitted via a facsimile function of the apparatus. The apparatus includes a data memory for storing input data; a transmission device for facsimile-transmitting the data stored in the data memory; a history information memory for storing history information of the transmission by the transmission device; a listing display for listing the history information stored in the history information memory; a specifying device for specifying desired history information from a history information listed displayed by the listing display; and a retrieval device for retrieving the transmitted data corresponding to the history information specified by the specifying device from the data memory device to a display.

Abstract: In an optical amplification monitoring apparatus of the invention, the number of signal light beams actually being transmitted is detected and an optical amplifier is controlled in accordance with the detected number. There is provided a means for monitoring intermodulation light beams resulting from signal light beams of two wavelengths which means includes a nonlinear medium and a WDM coupler that are provided on a light transmission path, an optical fiber grating for allowing passage of only intermodulation light components among the branched light beams, and a photodetector for converting the detected intermodulation light components into currents. A dispersion-shift optical fiber having a zero-dispersion wavelength in the 1.55-.mu.m band is used as the nonlinear medium. Intermodulation light beams are generated only when both signal light beams having different wavelengths w1 and w2 exist in the nonlinear medium.