The present disclosure provides a method and system for configuring an optical time domain reflectometer (OTDR) in a gigabit passive optical networks (PON), characterized by the steps of: collecting network data of the network to be scanned by switch controller to characterize said network; collecting data from various optical network terminals (ONTs) of the gigabit passive optical networks (GPON) by an OTDR and the Switch Controller to form a training database, the training data is used to train the method; optimizing the parameters of the optical time domain reflectometer (OTDR) based on the network data and the training database by a processor provided on the switching controller using machine learning. For point-to-multipoint (PMP) networks such as PON, the present method and system provides optimal set of parameters to configure OTDR before performing trace.

In order to measure the signal quality of each of optical signals transmitted/received via a plurality of transmission lines, an optical communication system 1 is provided with a dummy light source 10 for outputting dummy light, a switching means 20 for outputting the dummy light to a first transmission line 40a, and a light-receiving means 30 for acquiring first signal quality from the dummy light received via the first transmission line 40a, the switching means 20 switching the output destination of the dummy light from the first transmission line 40a to a second transmission line 40b, and the light-receiving means 30 acquiring second signal quality from the dummy light received via the second transmission line 40b.

In order to measure the signal quality of each of optical signals transmitted/received via a plurality of transmission lines, an optical communication system 1 is provided with a dummy light source 10 for outputting dummy light, a switching means 20 for outputting the dummy light to a first transmission line 40a, and a light-receiving means 30 for acquiring first signal quality from the dummy light received via the first transmission line 40a, the switching means 20 switching the output destination of the dummy light from the first transmission line 40a to a second transmission line 40b, and the light-receiving means 30 acquiring second signal quality from the dummy light received via the second transmission line 40b.

An OLT includes an NNI-PHY, a transmission reception unit that transmits a frame transmitted by an ONU, a control unit that transmits the frame if the transmission reception unit received the frame and the frame is not damaged, a process execution unit that executes a process of transmitting the frame to the NNI-PHY if the frame is the specific frame, and a monitoring judgment unit that executes at least one of a process of judging that the frame was discarded in the control unit if the frame does not pass between the control unit and the process execution unit within a first time and a process of judging that the frame was discarded in the process execution unit if the frame does not pass between the process execution unit and the NNI-PHY within a second time.

An information handling system includes a plurality of network nodes and a processor. Each network node includes an optical link and a reflectometry analyzer. The reflection analyzers provide a plurality of reflectometry results that each provide a characterization of physical properties of the optical link. The processor receives the reflectometry results, analyzes the reflectometry results to define a fingerprint of the physical properties of the optical link, and determines a status for each of the optical links based upon the associated fingerprints. The status for each of the optical links includes one of a plurality of graded statuses. Each graded status represents a qualitative measure of the physical properties of the associated optical link. A first graded status represents a better qualitative measure than a second graded status. The processor further receives a request to route a data flow from a first one of the network nodes to a second one of the network nodes. The data flow is associated with a service level agreement that defines that the data flow is to be routed on optical links that have the first graded status. The processor further determines a path between the first network node and the second network node where each of optical links in the path have the first graded status.

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.

An optical repeater device includes an amplifier module and a monitoring control circuit. The optical amplifier module includes an amplifier optical circuit including a plurality of amplification cores that amplify signal light propagating through different cores, and an optical amplifier control circuit that receives detection results from optical detectors at a plurality of signal light waveguide points of the amplifier optical circuit and generates a control signal directed to an excitation light source. The monitoring control circuit includes a reception unit that receives monitoring control channel light, a transmission unit that transmits the monitoring control channel light, an information determination unit that determines whether the monitoring control information received from the reception unit is for its own device or for another device, and a monitoring control unit that receives monitoring control information from the other device via the reception unit and the information determination unit and transmits the monitoring control information of its own device to the other device via the transmission unit and the information determination unit.

An optical repeater device includes an amplifier module and a monitoring control circuit. The optical amplifier module includes an amplifier optical circuit including a plurality of amplification cores that amplify signal light propagating through different cores, and an optical amplifier control circuit that receives detection results from optical detectors at a plurality of signal light waveguide points of the amplifier optical circuit and generates a control signal directed to an excitation light source. The monitoring control circuit includes a reception unit that receives monitoring control channel light, a transmission unit that transmits the monitoring control channel light, an information determination unit that determines whether the monitoring control information received from the reception unit is for its own device or for another device, and a monitoring control unit that receives monitoring control information from the other device via the reception unit and the information determination unit and transmits the monitoring control information of its own device to the other device via the transmission unit and the information determination unit.

A system and method for communicating supervisory information between amplifier nodes in an optical communication network utilizes modulation of an included pump source to superimpose the supervisory information on through-transmitted customer signals (or ASE associated with the amplifier if no customer traffic is present). The supervisory information (which may include monitoring messages, provisioning data, protocol updates, and the like) is utilized as an input to an included modulator, which then forms a drive signal for the pump controller. In a preferred embodiment, binary FSK modulation is used.