Abstract: Embodiments of this application provide a method and an apparatus for obtaining a transmitter test parameter, and a storage medium. The method includes: performing waveform sampling on an optical signal sent by a transmitter, to obtain a sampled electrical signal, obtaining a first noise amount associated with the sampled electrical signal based on a preset initial noise ratio parameter and a level amplitude of the sampled electrical signal, and obtaining a second noise amount associated with an ideal electrical signal based on the initial noise ratio parameter and a level amplitude of the ideal electrical signal. According to the application, a noise amount associated with a level amplitude of a sampled electrical signal is obtained without limiting a type of a receiver that performs a consistency test on a transmitter by using a transmitter test parameter.

Abstract: In some implementations, a device may transmit communication data to a transceiver via an access fiber optic cable. The device may determine that fiber sensing is to be performed for the access fiber optic cable. The device may cease transmission of the communication data for a predetermined time period. The device may generate an optical pulse after ceasing transmission of the communication data. The device may transmit the optical pulse to the transceiver via the access fiber optic cable. The device may receive, prior to expiration of the predetermined time period, a reflected signal from the access fiber optic cable based on the optical pulse. The device may analyze the reflected signal to generate sensing results. The device may perform one or more actions based on the sensing results.

Abstract: Provided are a submarine device, a submarine device monitoring method, and an optical communication system with which, even if a failure occurs, the failure occurrence location can be identified, and information necessary for recovery can be collected. This submarine device is provided with: a processing means for processing an input optical signal and outputting the processed optical signal; a first branching means for causing the optical signal input into the processing means to branch, and for outputting first branched light; a second branching means for causing the optical signal output from the processing means to branch, and for outputting second branched light; a selecting means for selecting and outputting the first branched light and the second branched light; and a monitoring means for monitoring the branched light output from the selecting means.

Abstract: The present disclosure provides an apparatus and method for measuring a nonlinear signal-to-noise ratio, and a test instrument. The method for measuring a nonlinear signal-to-noise ratio may include performing notch operation on at least one frequency point in a spectrum of an input signal in a symbol domain or a bit domain; performing spectrum measurement on an output signal after passing through a nonlinear system; and estimating a nonlinear signal-to-noise ratio of at least one frequency point of the nonlinear system according to a spectrum of the output signal. According to the embodiments of the present disclosure, when the notch operation is performed, internal structures of symbols or bits of the input signal may be retained, and an accuracy of the measurement of the nonlinear signal-to-noise ratio may be improved.

Abstract: This application relates to methods and apparatus for distributed fibre optic sensing and especially to the processing of signals derived from such sensing techniques to characterise events of interest. The application describes a method of distributed fibre optic sensing, comprising; performing distributed fibre optic sensing so as to generate at least one set of measurement signals from each of a plurality of sensing channels of an optical fibre (101) in response to at least one event of interest. For each set of measurement signals, processing the measurement signals from different sensing channels according to an association metric to determine whether any sensing channels are associated with one another and form at least one association matrix indicative of the sensing channels that are associated with one another.

Abstract: A method of packaging the silicon photonics wafer for fabricating custom optical-electrical modules includes fabricating a wafer with multiple dies of silicon photonics circuits based on custom design and conducting electrical and optical tests of the silicon photonics circuits in wafer level. The method further includes preparing the wafer for next point of use. Additionally, the method includes performing post-wafer processing on the wafer received at the next point of use. The method further includes conducting post-process electrical tests of the silicon photonics circuits in wafer level. Furthermore, the method includes preparing the wafer with known-good-dies or a known-good-wafer identified for custom use. Moreover, the method includes performing custom process on the know good dies.

Abstract: In some examples, a tunable dense wavelength division multiplexing (DWDM) optical time-domain reflectometer (OTDR) may include a fiber optic link analyzer, executed by at least one hardware processor, to determine, based on a user input, for a fiber optic link of a plurality of fiber optic finks of a fiber optic cable, whether the fiber optic fink is active or not active. The DWDM OTDR may specify, based on a determination that the fiber optic fink is active, a test wavelength that is different from a data transmission wavelength of data transmitted by the fiber optic fink. A DWDM multiplexer may be collocated with the DWDM OTDR to selectively connect, based on the specified test wavelength, the DWDM OTDR to the fiber optic fink of the plurality of fiber optic links for testing of the fiber optic link.

Abstract: An optical transmission apparatus outputs a main signal. An optical transmission apparatus superimposes a monitoring signal on an optical signal and outputs it. A submarine branching apparatus includes a return unit configured to return the monitoring signal received from the optical transmission apparatus and is configured to switch an output destination of the main signal received from the optical transmission apparatus to an optical transmission apparatus or the optical transmission apparatus. The optical transmission apparatus is configured to detect the monitoring signal returned from the return unit and notifies the optical transmission apparatus of a result of the detection. The optical transmission apparatus instructs the submarine branching apparatus to switch the output destination of the main signal in accordance with the notification.

Abstract: A distributed optical fiber sensing (DOFS)/distributed acoustic sensing (DAS) method employing polarization diversity combining and spatial diversity combining for a DOFS/DAS system wherein the polarization diversity combining determines a temporal average product for each beating product, determines one having a max average power, rotates that one having max average power for its phase shift to produce a reference, determines a phase difference for each beating product as compared to the reference, compensates any phase difference such that all beating products exhibit a well-aligned phase; and combining the beating products; and wherein the spatial diversity combining uses the combined beating products for each location, determines a temporal average power, determines a location having a greatest average power; and combines the results and provides an indicia of the combined result(s).

Abstract: Aspects of the present disclosure describe distributed fiber optic sensing (DFOS) distributed acoustic sensing (DAS) systems, methods, and structures that advantageously provide the localization of utility poles along a route of fiber optic cable.

Abstract: An optical transmission apparatus outputs a main signal. An optical transmission apparatus superimposes a monitoring signal on an optical signal and outputs it. A submarine branching apparatus includes a return unit configured to return the monitoring signal received from the optical transmission apparatus and is configured to switch an output destination of the main signal received from the optical transmission apparatus to an optical transmission apparatus or the optical transmission apparatus. The optical transmission apparatus is configured to detect the monitoring signal returned from the return unit and notifies the optical transmission apparatus of a result of the detection. The optical transmission apparatus instructs the submarine branching apparatus to switch the output destination of the main signal in accordance with the notification.

Abstract: It is possible to allow a user to easily distinguish between an event at a place to be resolved and an event at a place having no problem on a path of a PON communication network to be measured. A light intensity distribution of return light is processed in a time-series order to detect an event at each position on a network. A parameter N1 relating to the total number of splitters present on a path of the network is specified, the number N2 of detections of the total number of splitters detected as an event is recognized, and in a case where “N1>N2”, a last detected event is associated with one optical splitter and is further displayed as an “uncertain splitter” in distinction from a normal splitter.

Abstract: Systems and methods of optical restoration include, with a photonic service (14), in an optical network (10, 100), operating between two nodes (A, Z) via an associated optical modem (40) at each node, wherein each modem (40) is capable of supporting variable capacity, C1, C2, . . . , CN where C1>C2> . . . >CN, detecting a fault (16) on a home route of the photonic service (14) while the photonic service (14) operates at a home route capacity CH, CH is one of C1, C2, . . . , CN?1; downshifting the photonic service (14) to a restoration route capacity CR, CR is one of C2, C3 . . . , CN and CR<CH; switching the photonic service (14) from the home route to a restoration route (18) while the photonic service (14) operates at a restoration route capacity CR; and monitoring the photonic service (14) and copropagating photonic services during operation on the restoration route (18) at the restoration route capacity CR for an upshift of the photonic service (14).

Abstract: Aspects of the subject disclosure may include, for example, determining distinct timing offsets between an input port and output ports of a multiport optical device. An optical signal is injected at an input port of the device to obtain output signals at the output ports, which are injected into downstream fibers. An optical multipath return signal is received via the input port of the device, including a combination of measured events including reflections, backscatter, or both. A number of similar events expected in the number of downstream optical fibers is calculated to obtain an expected multipath signature based on configuration data. Results of the optical multipath return signal are then compared to the expected multipath signature to obtain comparison results. One of the measured events is distinguished from the others based on the first comparison results and the distinct timing offsets. Other embodiments are disclosed.

Abstract: According to an embodiment, both the high-speed communication and the low-speed communication are performed using a single communication line, thereby reducing limitations on wiring on a PCB and increasing the utilization efficiency of a transmission line.

Abstract: Implementations described and claimed herein provide systems and methods for a configurable optical peering fabric to dynamically create a connection between participant sites without any physical site limitations or necessity of specialized client and network provider equipment being located within such a facility. Client sites to a network may connect to a configurable switching element to be interconnected to other client sites in response to a request to connect the first client site with a second site, also connected to network, via the switching element. A request may trigger verification of the requested and, upon validation, transmission of an instruction to the switching element to enable the cross connect within the switching element. The first site and the second site may thus be interconnected via the switching element in response to the request, without the need to co-locate equipment or to manually install a jumper between client equipment.

Abstract: A coherent optical transmitter is in operable communication with an optical fiber an includes a plurality of analog-to-digital converters (ADCs) configured to (i) receive a plurality of radio frequency analog input signals, respectively, and (ii) convert the received plurality of RF analog input signals into a plurality of respective digital data streams. The transmitter further includes a source laser configured to output at least two orthogonal polarization component signals, and at least two polarization modulators configured to modulate (i) an in-phase portion output from a first ADC, (ii) an in-quadrature portion output from a second ADC, and (iii) one polarization component signal of the at least two orthogonal polarization component signals. The transmitter further includes a polarization beam combiner configured to (i) multiplex the respective outputs of the at least two polarization modulators, and (ii) transmit the multiplexed output from the polarization beam combiner to the optical fiber.

Abstract: Disclosed is an electronic apparatus transmitting or receiving a first optical signal for optical communication to and from an external apparatus through an optical cable, identifying light emitting characteristics of the optical cable, and transmitting a second optical signal corresponding to the identified light emitting characteristics of the optical cable through the optical cable.

Abstract: A system for measuring linear and non-linear transmission perturbations in optical transmission systems is disclosed. The system may include a processor to help facilitate measurement of non-linear noise at an optical transceiver. The system, for example, may receive a reference correlation of a transmission of a channel of a fiber link, record an optical power spectrum of the channel, and determine a baud rate of the channel. The system may also apply a spectral correlation technique to the channel with a multiple baud rate distance in frequency domain. The system may also calculate a generalized optical signal-to-noise ratio (gOSNR) value based on the spectral correlation technique and the reference correlation. The system may also compare the gOSNR with wavelength division multiplexed (WDM) OSNR measurements to evaluate an amount of non-linear noise contributions.

Abstract: In some examples, a tunable dense wavelength division multiplexing (DWDM) optical time-domain reflectometer (OTDR) may include a fiber optic link analyzer, executed by at least one hardware processor, to determine, based on a user input, for a fiber optic link of a plurality of fiber optic links of a fiber optic cable, whether the fiber optic link is active or not active. The DWDM OTDR may specify, based on a determination that the fiber optic link is active, a test wavelength that is different from a data transmission wavelength of data transmitted by the fiber optic link. A DWDM multiplexer may be collocated with the DWDM OTDR to selectively connect, based on the specified test wavelength, the DWDM OTDR to the fiber optic link of the plurality of fiber optic links for testing of the fiber optic link.

Abstract: A method and an arrangement are provided for inductive positioning of a current collector on a vehicle relative to a stationary current conductor. The method involves transmitting a signal having predetermined phase characteristics using a signal transmitter arranged along the longitudinal direction of the current conductor; detecting the transmitted signal using a signal receiver on the vehicle, which signal receiver comprises at least one vertical antenna; detecting the phase characteristics of the signal induced in the at least one vertical antenna, indicating the relative location of the vertical antenna and the signal transmitter in the transverse direction of the vehicle; and controlling a positioning arrangement in dependence of the received signals.

Abstract: This application discloses an optical signal transceiver apparatus, and belongs to the communications field.

Abstract: A fusion condition providing system for an optical fiber fusion splicer includes: a storage device storing a database of fusion conditions; a user-side communication unit transmitting a command for requesting a fusion condition for a pair of optical fibers to be fusion spliced by a user's fusion splicer; and a data management unit. The data management unit, in accordance with the command received from the user-side communication unit via a network, transmits the requested fusion condition among the plurality of fusion conditions inside the storage device to the user-side communication unit via the network so that the requested fusion condition is available for use in the fusion splicer. If the requested fusion condition was not in the database, the data management unit updates the database by causing the requested fusion condition to be newly created and storing the newly created fusion condition in the database.

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: Systems and methods for conducting various types of Connection Validation (CV) are provided for reducing the overall CV scan time of regular CV scans. A method, according to one implementation, includes a step of receiving a request to perform a focused CV on one or more communication cables after the one or more communication cables are physically connected or reconnected into a portion of a network. The method also includes the steps of interrupting an ongoing CV running in the portion of the network and executing the focused CV to target a CV scan on the one or more communication cables.

Abstract: A first optical path and a second optical path have a common path branching point. An OTDR sampling optical signal is emitted into the first optical path and into the second optical path through the common path branching point. At least one predefined optical property of the OTDR sampling optical signal emitted into the second optical path is altered and/or of a reflection of the OTDR sampling optical signal received from the second optical path is altered. An OTDR reflected optical signal resulting from a reflection of the OTDR sampling optical signal on the first optical path and/or from a reflection on the second optical path is detected. The OTDR reflected optical signal is analyzed to determine, based on the at least one predefined optical property, whether the OTDR reflected optical signal resulted from a reflection on the first optical path and/or on the second optical path.

Abstract: The subject technology relates to distributed sensing interrogation using single-mode fiber for multi-mode fiber interrogation. The subject technology includes deploying a distributed sensing tool into a wellbore, and logging the wellbore using the distributed sensing tool. The distributed sensing tool includes an optical amplifier and an optical filter coupled to a single-mode optical fiber and a multi-mode optical fiber. The optical amplifier is coupled to a single-mode circulator for amplifying a single-mode optical signal, and the optical filter is coupled to the optical amplifier for filtering the amplified single-mode optical signal. The single-mode circulator is coupleable to an interrogator for routing the single-mode optical signal to the multi-mode optical fiber and routing a reflective optical signal from the multi-mode optical fiber to the interrogator.

Abstract: The invention relates to a ground station for a UAV comprising a housing for accommodating a system on chip (SOC) circuit including a control processor for executing software to wirelessly control functions of the UAV, a first screen, and a second screen, wherein one or both screens are controlled directly by the SOC control processor. The housing may comprise a clam shell housing comprising a first housing member for accommodating the control processor and a second housing member movable relative to the first housing member between a first closed position overlaying said first housing member and a second open position. The arrangement is such that the first housing member has mounted thereon the first screen and the second housing member has mounted thereon the second screen such that both screens are viewable by a user when the second housing member is in its open position.

Abstract: A method of detecting intrusion events including at least two different event types which have different characteristics of frequency and time comprises providing a sensor responsive changes in a medium generated by a potential intrusion event with the sensor generating an output signal indicative of the changes in the medium, analyzing the signal to determine changes in amplitude so as to detect the change in amplitude of the detection signal as a function of time, and performing at least one of: (i) in the frequency domain, carrying out a frequency analysis of the signal from the sensor and dividing the frequency analysis into separate sections which are selected so as to correspond to the characteristic frequencies for each event type, or (ii) the algorithm requiring the presence or absence of a time domain step function.

Abstract: A method of optimizing production of a hydrocarbon-containing reservoir by measuring low-frequency Distributed Acoustic Sensing (LFDAS) data in the well during a time period of constant flow and during a time period of no flow and during a time period of perturbation of flow and simultaneously measuring Distributed Temperature Sensing (DTS) data from the well during a time period of constant flow and during a time period of no flow and during a time period of perturbation of flow. An initial model of reservoir flow is provided using the LFDAS and DTS data; the LFDAS and DTS data inverted using Markov chain Monte Carlo method to provide an optimized reservoir model, and that optimized profile utilized to manage hydrocarbon production from the well and other asset wells.

Abstract: A coherent optical transmitter is in operable communication with an optical fiber an includes a plurality of analog-to-digital converters (ADCs) configured to (i) receive a plurality of radio frequency analog input signals, respectively, and (ii) convert the received plurality of RF analog input signals into a plurality of respective digital data streams. The transmitter further includes a source laser configured to output at least two orthogonal polarization component signals, and at least two polarization modulators configured to modulate (i) an in-phase portion output from a first ADC, (ii) an in-quadrature portion output from a second ADC, and (iii) one polarization component signal of the at least two orthogonal polarization component signals. The transmitter further includes a polarization beam combiner configured to (i) multiplex the respective outputs of the at least two polarization modulators, and (ii) transmit the multiplexed output from the polarization beam combiner to the optical fiber.

Abstract: A method and an apparatus for measuring a profile of a beam output from a randomly-coupled multi-core fiber are provided. An apparatus includes a light source, a measurement unit, and an analysis unit. Light output from the light source is input in one or more of a plurality of spatial modes of the fiber at an input end of the fiber. The measurement unit measures a sum of intensity profiles of individual light components output from respective ones of the plurality of spatial modes by averaging a component of interference between the plurality of spatial modes in a beam profile of combined light output from the plurality of spatial modes at an output end of the fiber. The analysis unit calculates an MFD and/or Aeff of the fiber based on the sum of the intensity profiles of the individual light components obtained by the measurement unit.

Abstract: A method for determining a maximum transmission capacity, TCAPMAX-OL, of an optical link, OL, within an optical network includes loading an optical transmission spectrum of the optical link, OL, being partially occupied by at least one data traffic carrying channel, CH, with amplified spontaneous emission, ASE, noise spectrally shaped such that the transmission performance of the optical transmission spectrum fully occupied with data traffic carrying channels, CHs, is matched. The method further includes determining the maximum transmission capacity, TCAPMAX-OL, of the optical link, OL, on the basis of measured link data transported through the optical link, OL, via the at least one data traffic carrying channel, CH.

Abstract: Embodiments are disclosed for generating a lookup table value for calibrating a lookup table circuit in an optical transmitter. The example method includes generating a calibration signal. The calibration signal encodes a plurality of bits in a number of amplitude levels. The example method further includes transmitting the calibration signal to a module under calibration and transmitting a symbol sequence of defined length to a reference module. The reference module compares the symbol sequence with a distorted signal received from the module under calibration to generate a set of condition count statistics. The example method further includes receiving the set of condition count statistics from the receiver in the reference module and calculating a lookup table value based on the set of condition count statistics. The example method further includes transmitting the lookup table value to a transmitter associated with the module under calibration.

Abstract: A method and apparatus for optimizing optical transport using a software defined network (SDN) controller are disclosed herein. The SDN controller may define a margin optimization function based on at least one optical system performance metric. The function may include at least one related initiation criterion. Further, the SDN controller may collect at least one measurement for the performance metric. The measurement may include an assessment of deployed carriers not carrying client data. The SDN controller may determine whether the initiation criterion is met based on at least one collected measurement. The SDN controller may select a system margin optimization mechanism and define a system margin optimization threshold criterion on a condition that the initiation criterion is met. The SDN controller may determine whether the optimization threshold criterion is met. The SDN controller may implement one or more optimization events on a condition that the optimization threshold criterion is met.

Abstract: A system for mapping a multilayer network having a server layer and a client layer is provided. The system includes a framework configured for comparing information obtained from a first traffic counter of a client port to information obtained from a second traffic counter of a server port to thereby determine if the client port and the server port are linked.

Abstract: A coherent optical transmitter is in operable communication with an optical fiber an includes a plurality of analog-to-digital converters (ADCs) configured to (i) receive a plurality of radio frequency analog input signals, respectively, and (ii) convert the received plurality of RF analog input signals into a plurality of respective digital data streams. The transmitter further includes a source laser configured to output at least two orthogonal polarization component signals, and at least two polarization modulators configured to modulate (i) an in-phase portion output from a first ADC, (ii) an in-quadrature portion output from a second ADC, and (iii) one polarization component signal of the at least two orthogonal polarization component signals. The transmitter further includes a polarization beam combiner configured to (i) multiplex the respective outputs of the at least two polarization modulators, and (ii) transmit the multiplexed output from the polarization beam combiner to the optical fiber.

Abstract: A single-channel high-speed low-power-consumption optical transceiver chip is provided, which comprises an optical transmitter module, an optical receiver module, and a common module, wherein the optical transmitter module comprises a data buffer, a first clock and data recovery unit, a first data selector, a laser driver, a power controller, a first clock buffer, a light-emitting diode, and a first photodiode; the optical receiver module comprises a second photodiode, a direct-current bias module, a transimpedance amplifier, a feedback resistor, a second clock and data recovery unit, a second clock buffer, a second data selector, and an output driver; the common module comprises a power supply controller, a direct-current bias, a logic controller, a serial interface, a memory, and a pseudo random data generator and checker; and the common module also provides a communication loop for the optical transmitter module and the optical receiver module.

Abstract: A processing device having a skew controller configured to measure skew values between a plurality of signal lines coupled to the processing device; and a security module configured to store the skew values, and to compare new skew values with the stored skew values, wherein when the new skew values do not equal the stored skew values, the processing device is configured to perform an alarm action.

Abstract: A transmitter is provided that transmits data in either a “quasi-DP-BPSK” (“QDP”) mode or in a DP-QPSK mode. In the QDP mode, data bits are transmitted as changes in phase between first and second phase states along a first axis or as changes in phase between third and fourth phase states along a second axis in the IQ plane. A sequence bit identifies which axis carries the data bit. The sequence bit is one of a series of sequence bits that may be generated by a pseudo-random number generator. The series of sequence bits can be relatively long to permit sufficiently random changes in the axis that carries the data. Thus, unlike conventional BPSK, in which data is transmitted between phase states along a single axis, the present disclosure provides an apparatus and related method for randomly selecting one of two axes, for example, for each transmitted bit.

Abstract: A system and method consistent with the present disclosure provides for automated line monitoring system (LMS) baselining that enables capturing and updating of operational parameters specific to each repeater and associated undersea elements based on high loss loopback (HLLB) data. The captured operational parameters may then be utilized to satisfy queries targeting specific undersea elements in a Command-Response (CR) fashion. Therefore, command-response functionality may be achieved without the added cost, complexity and lifespan issues related to deploying undersea elements with on-board CR circuitry. As generally referred to herein, operational parameters include any parameter that may be derived directly or indirectly from HLLB data. Some example non-limiting examples of operational parameters include span gain loss, input power, output power, gain, and gain tilt.

Abstract: An apparatus comprises an optical detecting signal generator configured to provide an optical spectrum comprising two frequency carriers, the two frequency carriers having two different nominal carrier frequencies, and the output port of the optical detecting signal generator being further configured to be coupled to a device under test (DUT); an optical to electrical converter configured to generate a first electrical current based on the optical spectrum without the optical spectrum passing through the DUT; and generate a second electrical current based on the optical spectrum after the optical spectrum passes through the DUT; and a data processor coupled to the optical to electrical converter, the data processor being configured to determine a transfer function of the DUT at an average of the two different nominal carrier frequencies based on the first electrical current and the second electrical current.

Abstract: A method of managing optical services in a node in an optical network utilizing a flexible grid includes utilizing a Media Channel (MC) Trail Termination Point (TTP) to model frequency allocation of a MC on the node; utilizing a Network Media Channel (NMC) Connection Termination Point (CTP) to model a specific port for an optical channel corresponding to the NMC; utilizing a NMC cross connection (CRS) to model a path of the NMC in the MC; and programming hardware in the node based on the MC TTP, the NMC CTP, and the NMC CRS.

Abstract: The invention discloses a method, in an OLT in a passive optical network, of identifying a long-shining rogue ONU, the method comprising the steps of: A. allocating a specific radio frequency signal at a different frequency to each of ONUs in the passive optical network; and B. when the long-shining rogue ONU is detected in the passive optical network: b1. broadcasting a control message to each of the ONUs; b2. receiving uplink signals in the uplink; b3. recovering the specific radio frequency signals transmitted by the normal ONUs from the uplink signals; and b4. identifying an absent specific radio frequency signal according to the recovered specific radio frequency signals, wherein the ONU corresponding to the absent specific radio frequency signal is the long-shining rogue ONU. The invention further discloses an OLT device performing the method and a method, in an ONU, of assisting the OLT in identifying a long-shining rogue ONU.

Abstract: A method and device for detecting shared risk link groups is disclosed. The method comprises injecting a probe beam, respectively, into a first test link and a second test link. The method further includes recording, respectively, a first curve of a time-varying first power corresponding to the first backlight and a second curve of a time-varying second power corresponding to the second backlight; calculating a resemblance value for the first curve and the second curve; and judging, based on the resemblance value, whether the first test link and the second test link are located in the same shared risk link group. The method and device for detecting shared risk link groups provided by embodiments of the present invention detect by testing a power characteristic of backlight of a probe beam in test links and, based on that one-dimensional power characteristic, judge whether the test links are in the same shared risk link group, which are simpler in application than those in the prior art.

Abstract: A method for compensating for a signal error at a transmit end of an optical time domain reflectometer is provided. The method includes: detecting an actual signal sequence of a PN sequence sent by a transmitter to a measured optical fiber and an actual signal sequence of an optical signal and reflected back by the measured optical fiber and received by a receiver; obtaining a compensation value of the optical signal that attenuates in a process in which the optical signal is reflected by the measured optical fiber; computing an optical fiber attenuation curve function obtained through a current iteration; and determining, when determining that the optical fiber attenuation curve function obtained through the current iteration satisfies a given condition, performance of the measured optical fiber according to the optical fiber attenuation curve function obtained through the current iteration.

Abstract: There is provided a control device for controlling a first transmission device and a second transmission device, the control device including a memory, and a processor coupled to the memory and the processor configured to set a first wavelength path between the first transmission device and the second transmission device, select a monitoring wavelength path from established wavelength paths allocated on a transmission line between the first transmission device and the second transmission device, monitor a signal quality of the monitoring wavelength path, and increase power of the first wavelength path, based on the signal quality of the monitoring wavelength path.

Abstract: A detection apparatus concurrently connected to N optical module cages by using N paths. The apparatus accesses a conflict register, acquires an occupancy status of the N paths according to a value of the conflict register, then performs a concurrent probe on M optical module cages connected to M paths that are in the N paths and whose occupancy status are not occupied by system software, to obtain a probe result, where the probe result includes availability information of optical modules of the M optical module cages and a type of the optical modules, and finally, writes the probe result into an availability register, so that the system software can acquire the probe result from the availability register. Therefore, whether an optical module is available in an optical module cage can be monitored in real time and fast insertion and removal operations on the optical module can be sensed.

Abstract: Some embodiments provide a device that includes an optical module manager, an optical power manager, and a notification manager. The optical module manager may be configured to poll an optical module coupled to the device for received optical power values. The optical module manager may be further configured to receive a received optical power value. The optical power manager may be configured to determine a baseline power value based on the polling of the optical module. The notification manager may be configured to generate a notification when the received optical power value differs from, e.g., falls below, the baseline power value by a threshold amount. The notification indicates that a tampering of optical signals transmitted to the device may have occurred.

Abstract: The present invention provides a method and apparatus for determining a rogue ONU in an OLT of a PON. The method comprises determining an original infected zone based on a first time slot allocation in which each time slot corresponds to one uplink signal of an ONU; determining a new infected zone based on a second time slot allocation in which each time slot corresponds to an uplink signal of an ONU; determining if there is a same ONU in the original infected zone and in the new infected zone to determine rogue ONU candidate, and determining a rogue ONU based on the rogue ONU candidate. The solution disclosed in the present application has the advantages of quick determination of the rogue ONU, no interruption of the normal service and system compatibility etc.