Provided is a communication control method of controlling communication between a first electrical switch and a second electrical switch each connected via an optical network and via an electrical network and each responsible for one or more devices to enable a data transfer with high reliability and low latency. The communication control method includes processes of (A) determining the presence or absence of blocking in relation to a first setup request of an optical circuit from the first electrical switch to the second electrical switch and (B) performing, if the blocking is present, at least one process of a first process of transmitting, from the first electrical switch, a second setup request of the optical circuit from the first electrical switch to the second electrical switch and a second process of transmitting a packet or a packet flow related to the first setup request from the first electrical switch via the electrical network.

A fault detection apparatus includes: a transmitter that transmits a first optical signal through an optical transmission line; a receiver that receives, in response to the transmission of the first optical signal, a second optical signal from the line, and measures the reception level of the second optical signal; and a control unit that specifies a section where the second optical signal corresponding to the first optical signal was generated, calculates an optical level corresponding to a loss in said section on the basis of the reception level, determines that a first fault has occurred in the section when the optical level in the section has changed from a first reference level by a first threshold or more, sets a second reference level and a second threshold after occurrence of the first fault, and determines occurrence of a second fault.

A long-distance high-precision optical fiber interference sensing and positioning system includes a sensing light path, a control terminal, a light source module, a front-end optical processing module, a back-end optical processing module, a photoelectric conversion module, a digital signal collection module and a MCU central processing module. The control terminal is provided with a signal processing and positioning device for calculating and positioning sensing signal positioning information. The present system can solve the security problem of an ultra-long-distance optical cable, can send alarm information in a timely manner with regard to an intrusion event by means of vibration positioning, and can also solve the problem of occupation of an optical cable channel, and improves the utilization efficiency of the optical cable by means of wavelength division multiplexing technology.

A data communication network includes a network node and a processor. The network node includes an optical link and a reflectometry analyzer to provide a plurality of reflectometry results, each reflectometry result providing a characterization of physical and operational properties of the optical link at the time of the reflectometry result. The processor receives a first set of the reflectometry results, and calculates a federated fingerprint of the physical and operational properties of the optical link based on the plurality of fingerprints in first set of the reflectometry results. The federated fingerprint is a combination of fingerprints from every section of the optical link. The processor receives a second set of the reflectometry results, and compares each of a plurality of fingerprints in the second set of reflectometry results with a respective corresponding fingerprint in the federated fingerprint. The processor determines whether a physical tampering of the optical link has occurred based upon the comparison.

An information handling system includes a plurality of network nodes and a processor. The network nodes each include an optical link and a reflectometry analyzer. The reflection analyzers provide reflectometry results that each provide a characterization of physical properties of the associated optical link. The processor receives the reflectometry results, and, for each optical link, analyzes the reflectometry results to determine a fingerprint of the physical properties of the associated optical link. The processor further determines a status for each of the optical links based upon the associated fingerprints, and displays a map of the information handling system including each network node and the associated optical link, wherein the map provides an indication of the status for each of the optical links.

A method of obtaining a measure of asymmetry between optical fibers of a forward and reverse paths is provided in order to synchronize clocks of optical nodes connected by asymmetrical optical fiber paths. The method includes receiving, at first and second arrival times, from a first optical network device, a first optical signal transmitted on a first optical fiber and a second optical signal transmitted on a second optical fiber, calculating a first time difference between the second arrival time and the first arrival time. The method includes determining a measure of asymmetry between the first optical fiber and the second optical fiber based on the first time difference and a second time difference between a first time of transmission by the first optical network device of the first optical signal and a second time of transmission by the first optical network device of the second optical signal.

This application discloses an optical network system, a management device, an optical transmission apparatus, and a communications device, and belongs to the field of optical network technologies. A first communications device in the optical network system is configured to send physical information of the first communications device to a second communications device, where the physical information includes first module information of a first optical transmission apparatus. The second communications device is configured to determine a working status of the optical network system based on the first module information, second module information of a second optical transmission apparatus, and link information of an optical fiber link.

An information handling system includes a plurality of network nodes and a processor. The network nodes each include an optical link and a reflectometry analyzer. The reflection analyzers provide reflectometry results that each provide a characterization of physical properties of the associated optical link. The processor receives the reflectometry results, and, for each optical link, analyzes the reflectometry results to determine a fingerprint of the physical properties of the associated optical link. The processor further determines a status for each of the optical links based upon the associated fingerprints, and displays a map of the information handling system including each network node and the associated optical link, wherein the map provides an indication of the status for each of the optical links.

The concepts and technologies disclosed herein are directed to quantum tampering threat management. According to one aspect of the concepts and technologies disclosed herein, a quantum security manager (“Q-SM”) can monitor a plurality of quantum channels for tampering. The Q-SM can detect tampering on a quantum channel of the plurality of quantum channels. The Q-SM can provide tampering monitoring statistics to a software-defined network (“SDN”) that, in turn, notifies a quantum security operations center (“Q-SOC”) about the tampering on the quantum channel. The Q-SM can receive threat mitigation instructions from the Q-SOC. The threat mitigation instructions can instruct the Q-SM how to counter the tampering on the quantum channel. The Q-SM can perform one or more actions in accordance with the threat mitigation instructions to counter the tampering on the quantum channel.

An example system includes a transceiver and a microcontroller. The microcontroller is configured to receive, from first and second network interfaces of the transceiver, a plurality of messages from a hub node and the leaf nodes. Each of the messages corresponds to a respective one of the ingress or egress data flows. The microcontroller is also configured generate a resource assignment map based on the messages. The resource assignment map includes pairings between a respective one of the ingress data flows and a respective one of the egress data flows, and, for each of the pairings, an indication of a respective network resource assigned to exchange the egress data flow of that pairing with a respective one of the leaf nodes. The microcontroller is also configured to generate a command to cause the transceiver to transmit the egress data flows in accordance with the resource assignment map.