| Class / Patent application number | Description | Number of patent applications / Date published |
|---|
| 398005000 | Spare channel or standby optical fiber | 56 |
| 20130028592 | APPARATUS AND METHOD FOR SWITCHING PATHS IN A WAVELENGTH-MULTIPLEXING NETWORK - An apparatus switches paths in a wavelength-multiplexing network in which a first number of wavelengths each used for a path to transmit an optical signal are multiplexed into an optical fiber. The apparatus includes an entire switching unit and a second number of individual switching units where the second number is smaller than the first number. The entire switching unit is configured to perform a path-switching process for switching a path, simultaneously on all the first number of wavelengths when failures have occurred for all the first number of wavelengths. The second number of individual switching units are each configured to perform the path-switching process individually on one of a third number of wavelengths included in the first number of wavelengths when at least one failure has occurred for the third number of wavelengths where the third numbers is smaller than the first number. | 01-31-2013 |
| 20090196598 | OPTICAL SOURCE LINK TRANSMISSION DEVICE AND METHOD - An optical source link transmission device includes a sending end module and a receiving end module. A master optical source link, a backup optical source link, a master data channel, and a backup data channel are integrated into the sending end module; and a master receiving link and a backup receiving link are integrated into the receiving end module. An optical source link transmission method includes: sending channel handover information when detecting failure information of service signals, and performing a handover between a master optical source link and a backup optical source link, and a handover between a master data channel and a backup data channel according to the channel handover information received. The present invention can provide an effective protecting measure for the photoelectric signal transmission in the optical source link, and improve the reliability of the photoelectric integrated device. | 08-06-2009 |
| 20130077960 | UTILIZING OPTICAL BYPASS LINKS IN A COMMUNICATION NETWORK - Optical By-Pass (OBP) links may be created by adding wavelengths between nodes on the network. The OBP may extend between any pair of nodes on the network. Intermediate nodes on the OBP are transient nodes and simply forward traffic optically. An OBP extends between a pair of nodes and, unlike express links, is created in such a manner that it does not affect the previous allocation of resources on the network. This enables capacity to be added between pairs of nodes on the network to alleviate congestion at a portion of the network, without changing other traffic patterns on the network. This enables inclusion of an OBP to be deterministic and of linear impact on the network. The OBP links may be statically provisioned or created on demand. Optionally, the OBP links may be crated to coincide with PBB-TE tunnels on the network. | 03-28-2013 |
| 20090041454 | SOA-MZI Device Fault Isolation - A photonic integrated circuit having a plurality of circuit components, is disclosed, which may include an MMI for splitting signal power passing therethrough among first and second optical pathways coupled to first and second outputs, respectively, of the MMI, thereby directing first and second percentages of the signal power along the first and the second optical pathways, respectively; and a photodetector integrated into the photonic integrated circuit and coupled to said first optical pathway for measuring a signal power level on said first optical pathway. | 02-12-2009 |
| 20130114953 | OPTICAL TRANSPORT NETWORK PORT PROTECTION SYSTEMS AND METHODS USING FLEXIBLE SWITCH CRITERIA - The present disclosure provides Optical Transport Network (OTN) port protection systems and methods using flexible switch criteria. Specifically, the OTN port protection systems and methods provide linear protection in OTN such as 1+1 Protection with Automatic Protection Switching (APS) and/or 1+1 Subnetwork Connection Protection (SNCP) Protection. The OTN Port Protection with flexible switch criteria allows a user to provision a protection application on an OTN Port and select a switch criteria, Section Monitoring, Path Monitoring, or Tandem Connection Monitoring, without considering the provisioning state of an Optical channel Data Unit level k (ODUk) entity. The ODUk entity may either be cross-connected in the LO case or terminated in the HO case. The ODUk entity may be provisioned independently, after the port protection has been established. | 05-09-2013 |
| 20090238556 | OPTICAL SIGNAL DIVISION TRANSMISSION SYSTEM, OPTICAL TRANSMITTER, OPTICAL RECEIVER, AND OPTICAL SIGNAL DIVISION TRANSMISSION METHOD - An optical signal division transmission system in which an input optical signal is divided into N parts (termed as “N-part optical signals”) and transmitted at a transmission rate of 1/N, wherein an additional optical wave path is provided separately from an optical wave paths for transmitting said N-part optical signals, and even if a malfunction occurs in any one of said optical wave paths for transmitting said N-part optical signals, transmission of said N-part optical signals is continued, using said additional optical wave path. | 09-24-2009 |
| 20090232492 | DIRECTIONLESS OPTICAL ARCHITECTURE AND HIGHLY AVAILABLE NETWORK AND PHOTONIC RESILIENCE METHODS - The present invention provides a directionless optical architecture for reconfigurable optical add/drop multiplexers (ROADMs) and wavelength selective switches (WSSs). The directionless architecture utilizes a directionless wavelength switch coupled between client devices and ROADMs/WSSs to eliminate the need to hard-wire client devices to a wavelength division multiplexed (WDM) network. Accordingly, client device connections can be automatically routed without manual intervention to provide a highly resilient network design which can recover route diversity during failure scenarios. Additionally, the present invention minimizes deployments of costly optical transceivers while providing superior resiliency. Further, the present invention couples the directionless optical architecture and associated optical protection mechanisms with existing mesh restoration schemes to provide additional resiliency. | 09-17-2009 |
| 20130121684 | Apparatus And Method For Providing Protection In A Passive Optical Network - An apparatus and method for cost-effectively providing protection in a PON. Protection ports, usually on a protection LT card, are configured to communicate with a selectable one of the downstream ODN splitter/combiners associated with the primary ports on the remaining LT cards of the OLT. Each protection port includes at least a splitter for distributing a transmitted signal from a light source to a plurality of switched protection fibers, and may have an optical amplifier to provide for lossless or low-loss distribution. Each port may also have a combiner for combining received signals from a plurality of switched protection fibers. When a failure is detected at a primary port, traffic is re-directed from the primary port to the protection port after the protection port has been configured to communicate with the same ODN splitter/combiner as the failed primary port. | 05-16-2013 |
| 20110268435 | COMMUNICATION SYSTEM, SUBSCRIBER ACCOMMODATING APPARATUS AND COMMUNICATION METHOD - Switching process at the occurrence of a path trouble is performed more quickly to reduce the number of packet discards during a traffic transition from a currently used system path to a standby system path within a section to be protected. An OLT ( | 11-03-2011 |
| 20100278526 | Optoelectronic Integrated Apparatus And Method For Protecting Optoelectronic Integrated Apparatus - An optoelectronic integrated apparatus, including a plurality of working optical source links, at least one spare optical source link, at least one spare data channel, and a protection control unit for detecting whether there is any working optical source link faulty. When detecting that a working optical source link is faulty, controlling a spare optical source link whose emission wavelength is the same as the faulty working optical source link to fulfill the functions of the faulty working optical source link and switching a data signal from the working data channel to a spare data channel. The spare optical source link is adapted to modulate the optical signal using the data signal from the spare data channel, and transmits the modulated optical signal. Reliability of the optoelectronic integrated apparatus is enhanced without increasing the maintenance cost. | 11-04-2010 |
| 20120294604 | OPTICAL PROTECTION AND SWITCH ENABLED OPTICAL REPEATING - An optical transmission system or its constituent repeater disposed optically between two terminals. The system includes at least two parallel optical paths between a first node and the repeater (one optical path being used as a backup for another), and another at least two parallel optical paths between a second node and the repeater (again, one optical path being used as a backup for another). The first nodes may, but need not, be terminals, but could also be repeaters, or other optical elements. For a signal traveling from the first terminal to the second terminal, the optical switching mechanism detects which of the at least two parallel optical paths an optical signal is being received from the first node, and channels the optical signal to at least one of the parallel optical paths leading from the repeater to the second node. | 11-22-2012 |
| 20100080553 | AUTOMATIC LASER SHUTDOWN AND RECOVERY IN RESPONSE TO A LINK BREAK - A communication system may include a first control circuit to detect a break on a first optical link; a first optical source to supply a first optical signal on a second optical link in response to detecting the break on the first optical link, the first optical signal propagating in a first direction on the second optical link; a second control circuit to detect a presence of the first optical signal on the second optical link, and output a control signal in response to detecting the presence of the first optical signal; and a second optical source to supply a second optical signal on the second optical link, the second optical signal propagating in a second direction opposite the first direction, where the Raman pump is disabled in response to the control signal. | 04-01-2010 |
| 20080240710 | OPTICAL COMMUNICATION SYSTEM, OPTICAL COMMUNICATION APPARATUS, AND METHOD OF MONITORING FAULT ALARM IN PATH SECTION DETOUR - The optical communication system of the present invention is constructed with a data plane and a control plane, and includes a first monitor for monitoring a path alarm on the data plane, a second monitor for monitoring a path alarm on the control plane, and an alarm comparator for comparing alarm statuses of the optical paths that the first monitor and the second monitor preserve, wherein an optical communication apparatus, of which the first monitor and the second monitor both are in a status of having detected the alarm, operate so as to start an operation of avoiding a fault. Such a configuration makes it possible to make a detour only around an appropriate section including a fault location without performing an erroneous operation when a fault has occurred in an optical path, in which a plurality of detour sections, in an all-optical communication system. | 10-02-2008 |
| 20120045199 | Method and apparatus for implementing trunk optical fiber protection in ethernet passive optical network (EPON) - The present invention provides a method and apparatus for implementing trunk optical fiber protection in EPON. According to the technical scheme of the present invention, activating an optical module at a master PON port, deactivating an optical module at a standby PON port, configuring a service for the master PON port, and synchronizing static data and dynamic data to the standby PON port; synchronizing and adjusting a value of an MPCP counter at the standby PON port according to a value of an MPCP counter at the master PON port; and carrying out fault detection, transmitting an operating state to the standby PON port when the fault occurs, and performing a master-standby switch of the PON ports. In accordance to the present invention, by means of adjusting the MPCP counter at the standby PON port and further setting a dedicated communication channel, the fast communication between the master and standby PON ports is realized, so that the ONU does not to re-register when performing the master-standby switch for implementing the trunk optical fiber protection process in EPON system, as a consequence, the service restoration time for protection switch is remarkably shortened, the system reliability is enhanced, and the performance of the protection switch is improved. | 02-23-2012 |
| 20110142438 | PROTECTION SWITCHING METHOD IN OPTICAL TRANSPORT NETWORK - In an optical transport network for packet transmission, at least one tunnel for providing an end-to-end connection between nodes is formed, and the tunnel includes at least one optical wavelength. A plurality of optical channels are allocated to each optical wavelength, and one optical channel is set up as an optical channel for protection switching for the tunnel. If a failure occurs in an optical channel in packet transmission, packets are transmitted through the optical channel for protection switching set up for the corresponding tunnel. | 06-16-2011 |
| 20110229123 | CROSS-DOMAIN PARALLEL RECOVERING METHOD AND SYSTEM IN MULTI-LAYER AND MULTI-DOMAIN DISTRIBUTED OPTICAL NETWORK - Provided is a cross-domain parallel recovering method and system in multi-layer and multi-domain distributed optical network (MMDON). Based on inter-domain LRA (Link Recovery Algorithm), the routing devices establish inter-domain WP (Work Path) and then build inter-domain RP (Recovery Path) based on WP. Inter-domain RPs will be established by using PSM (Parallel Signaling Mechanism) when link failure occurs on inter-domain WPs. That realizes the establishments and of inter-domain RP, and improves the survivability of inter-domain services. Inter-domain RPs are established or engaged before the establishing of WPs, while the intra-domain paths are established after the failure testing. This mechanism ensures the availability of inter-domain resources during recovery and avoids resource waste caused by pre-establishing intra-domain RPs. Moreover, parallel signaling mechanism can decrease the recovery time, and can handle inter-domain link failures simultaneously to avoid queue-waiting. | 09-22-2011 |
| 20090245783 | METHOD AND SYSTEM FOR PROVIDING FAULT RECOVERY USING COMPOSITE TRANSPORT GROUPS - An approach is provided for performing fault recovery using composite transport groups (CTGs). A first logical channel is established within a composite transport group, wherein the first logical channel is established over a first link associated with a first service provider to a customer premise equipment (CPE) node configured to transport packets. A second logical channel is established within the composite transport group, wherein the second logical channel is established over a second link associated with a second service provider to an optical node. Packets are received over the first logical channel. Packets are received over the second logical channel if the first logical channel experiences a fault condition, wherein switching to the second logical channel is transparent to the CPE node. | 10-01-2009 |
| 20120195589 | Optical Network Automatic Protection Switching - There is described an optical terminal for use in a passive optical network. The optical terminal comprises an optical I/O module for sending and receiving optical data packets along an optical fibre, an electrical I/O module for sending and receiving electrical data packets via an electrical connection, a signal converter operatively connected to the optical and electrical I/O modules for converting the data packets between optical and electrical formats, a controller for controlling the operation of the I/O modules and the signal converter. The controller is configured to detect a failure of a primary data path in the optical network, initiate an automatic protection switch to a secondary data path for optical data packets, and generate traffic flow update messages to be sent upstream. Each traffic flow update message contains, as a source address, a MAC address of a client device downstream of the terminal. | 08-02-2012 |
| 20100003027 | METHOD AND APPARATUS FOR SUPPORTING STANDBY CHANNELS AND STANDBY BUFFERING - Providing a user service may be threatened due to an inability to communicate upstream in an event of a network or network node fault. Often the user service is simply terminated leaving a user with a poor perception of the provided user service. In contrast, providing a network service, such as an alternative to the terminated user service, may leave the user with a better perception of the provided user service. Accordingly, a method and corresponding apparatus are provided to support a network service by monitoring states of an access network interface and user network interface of an access network device, and providing a predetermined non-requested channel to the access network device based on a combination of the monitored states. As a result, a service provider can more reliably provide a user service to a user. | 01-07-2010 |
| 20110236013 | USE OF SUBCARRIER DEACTIVATION IN A MULTI-SUBCARRIER CHANNEL TO IMPROVE REACH IN AN OPTICAL NETWORK - Various example embodiments are disclosed. According to an example embodiment, a method may include determining that a transmission of a data signal over a path of a wavelength division multiplexed (WDM) optical network using a group of optical subcarriers is not optically feasible; determining that the transmission of the data signal over the path using a subset of the group of optical subcarriers is optically feasible; activating subcarriers for the subset of optical carriers while deactivating one or more optical subcarriers of the group, at least one deactivated subcarrier provided between at least two activated subcarriers of the group; and transmitting the data signal over at least a portion of the path using the activated subcarriers of the group. | 09-29-2011 |
| 20100178050 | SIGNAL TRANSMITTER, SIGNAL RECEIVER, AND SIGNAL TRANSMISSION SYSTEM - A signal transmitter includes: a main transmission line-transmitting portion that transmits optical signals through main transmission lines; a backup transmission line-transmitting portion that transmits the optical signals through backup transmission lines paired with the main transmission lines; a selector that selects a transmission line to be used for transmitting the signals from any of the transmission lines through which the signals are transmitted by the main transmission line-transmitting portion and the backup transmission line-transmitting portion; and a controller that, when a fault occurs on at least one main transmission line, outputs a switching command to the selector based on information identifying the main transmission line with the fault, thus causing the main transmission line-transmitting portion to stop transmitting the signals to the main transmission line with the fault, while causing the backup transmission line-transmitting portion to transmit the signals being transmitted to the main transmission line with the fault to the backup transmission lines. | 07-15-2010 |
| 20120141117 | Network Protection Method and Device - The invention discloses a network protection method and device, the method comprises: initiating a protection configuration request through a control plane of an automatically switched optical network (ASON); and realizing a protection configuration on each node of the network according to the protection configuration request. A safe and reliable recovery capability; a reliable efficiency guarantee and an effective guarantee of the coordination of the switching and recovery are provided. | 06-07-2012 |
| 20090074404 | System, Device and Method for Managing Alternate Site Switching in an Optical Communication System - A system, device, and method for managing alternate site switching in an optical communication system recovers from failures/degradations that are uncorrected by the core optical communication network. When an uncorrected failure/degradation is detected, communications for a protected end-system are switched from a primary end-system to a backup end-system. The backup end-system may be selected a priori, for example, during connection establishment, in order to reduce switching time once a decision has been made to switch communications from the primary end-system to the backup end-system. Provisions are made for completing the alternate site switching within a specified amount of time. Load balancing may be used to further reduce switching time from the primary end-system to the backup end-system. This alternate site switching augments the various protection mechanisms provided by the core optical communication network in order to provide end-to-end protection for the optical communication path. | 03-19-2009 |
| 20080292310 | Method, Apparatus And System For Optical Channel Group Shared Protection - A method, equipment and system for sharing protection of grouped optical channels, provides, taking the network node as the source node, the middle node and/or the host node and dividing the influenced optical wavelength channels into a source optical channel set, a host optical channel set and a middle node optical channel set; then separating the source optical channel set from the protecting channel of the protecting fiber selectively to be converted from the working fiber to the protecting fiber to be transmitted; separating the host optical channel set from the channel of the protecting channel selectively to end at the host node; and passing through the channel set of the middle node channel set to the next node. This disclosure also provides a multi-grouped optical channel share protection devices and a system thereof. | 11-27-2008 |
| 20100296808 | METHOD AND DEVICE FOR THE 1+1 PROTECTION OF AN OPTICAL TRANSMISSION PATH - The present invention encompasses a method for 1+1 protection of an optical transmission path comprising a working path and a protection path that connect a first and second terminal node. In a working mode, an optical transmission signal is transmitted via the working path from the first to the second terminal node. At the second terminal node, the optical transmission signal is split into two optical sub-signals, and one of the optical sub-signals is sent via the protection path to a protection-path connection node as a working-path control signal. In the case of an interruption of the signal transmission via the working path, the protection-path connection node detects the absence of the working-path control signal and switches the system from the working mode to a protection mode in which signal transmission is conducted via a separate protection path. | 11-25-2010 |
| 20100310251 | Optical Transmission Systems, Devices, and Methods - An optical system with a first and second network tiers. The first network tier includes a plurality of major nodes optically interconnected by at least one transmission path. The second network tier includes a plurality of minor nodes disposed along the transmission path and the minor nodes are connected to at least one of the major nodes. The minor node is configured to transmit all traffic to an adjacent major node, and the major nodes are configured to transmit to and receive information from other major nodes and minor nodes on transmission paths connected to the major node. | 12-09-2010 |
| 20090034963 | Method and an apparatus to provide optical equipment protection - A method and an apparatus to provide optical equipment protection have been disclosed. In one embodiment, the method includes splitting an incoming optical signal into a first and a second optical signals, sending the first and the second optical signals to a first and a second equipments in an optical network node, respectively, the second equipment being a protection module for the first equipment, monitoring a first and a second outgoing optical signals from the first and second equipments, and declaring a failure of the optical network node if only one of the first and the second outgoing optical signals has failed. Other embodiments have been claimed and described. | 02-05-2009 |
| 20110116789 | MAINTENANCE FRIENDLY OPTICAL FIBER SWITCHING SYSTEM - First and second switching device are connected by a number of signal paths. The first switching device receives an instruction to switch from a first one of the signal paths to a second one of the signal paths. The first switching device performs, in response to the received instruction, a first switching operation to connect the first path, at an input of the first switching device, to the second path, at an output of the first switching device. The second switching device receives the instruction to switch from the first path to the second path and detects a loss of signal on the first path as a result of the first switching operation performed by the first switching device. The second device performs, in response to detecting the loss of signal on the first path, a second switching operation to connect the first path, at an output of the second switching device, to the second path, at an input of the second switching device. | 05-19-2011 |
| 20100098407 | METHOD AND SYSTEM FOR PROTECTION SWITCHING IN ETHERNET PASSIVE OPTICAL NETWORKS - One embodiment provides a system that performs protection switching in an Ethernet passive optical network (EPON), which includes an optical line terminal (OLT) and at least one optical network unit (ONU). The system is configured with at least one redundant component for the OLT and/or ONUs, wherein the redundant component can be optical or electrical, and can be a port, line card or link. The system provides protection by detecting a failure, and switching automatically to the redundant components to reduce service disruption time. The protection switching comprises: preserving the existing configuration over the loss of at least one of a multiple-point control protocol (MPCP) message; an operations, administration and maintenance (OAM) message; and a signal on the physical layer. The system recovers from the failure without performing ONU discovery. | 04-22-2010 |
| 20090290866 | Communication recovering system for wavelength division multiplexed passive optical network - A communication recovering system for a wavelength division multiplexed passive optical network (WDM PON). The communication recovering system can recover fault of optical fibers between the central office and the remote nodes without additional optical fibers by grouping two remote nodes and employing an AWG having periodic transmission characteristics, and can also simply and rapidly recover such a fault with minimal optical loss using an AWG of 2×N structure and an On-Off optical switch, although protection optical fibers are additionally installed therein. The system can rapidly recover fault of optical fibers between a local office and optical network units, 1:N manner, using 2×2 optical switches, which are installed to each of the optical network units, a reserved transmitter and receiver, and a transceiver. The communication recovering system has advantages in that it can simplify network structure, be cost-effectively implemented, reduce optical loss, and rapidly perform protection of optical fiber fault. | 11-26-2009 |
| 20080199178 | OPTICAL COMMUNICATION SYSTEMS AND METHODS OF OPERATING SUCH OPTICAL COMMUNICATION SYSTEMS - An optical communication system includes a first optical device including a transmission optical switch and a controller coupled to the transmission optical switch, and a second optical device coupled to the first optical device via each of a first fiber and a second fiber. The transmission optical switch is configured to operate in one of a first mode associated with the first fiber and a second mode associated with the second fiber based on control signals generated by the controller. Moreover, the controller is configured to perform a non-revertive switching operation on the transmission optical switch based on the satisfaction or the non-satisfaction of a predetermined condition or a plurality of predetermined conditions. | 08-21-2008 |
| 20100284688 | APPARATUS AND METHOD FOR ENSURING CONTINUITY OF FIBER OPTIC - In a fiber-optic communications system, a backup or redundant optical link is provided at the central office in parallel with the primary one in use. Parameters associated with the backup link, including its signal delay, its attenuation, etc. are stored at the time of installation. Upon failure of the primary link, switchover can be automatic, and the stored parameters are used to make adjustments necessary for the differences between the primary link and the backup link. In addition, having information on the differences between the two links, the central office is able to send control information downstream which is used at the remote site to control changes that must be made for upstream signals. For example, customer equipment can be signaled to adjust its timing for the next time slot or interface amplifiers can be adjusted to account for the change in attenuation. The central office could be provided with a corrected interface to accommodate the new link and a substantial buffer to account for the change in timing, and switchover to the new timing could be done gracefully. | 11-11-2010 |
| 20110262129 | Method for Authentication of a Wireless Backup System for an Optical Network Unit - An apparatus comprising a first passive optical network (PON) component configured to couple to a second PON component via an optical link and authenticate the second PON component based on authentication information to authorize a backup wireless link between the first PON component and the second PON component. The backup wireless link corresponds to a wireless backup system for the PON. The authentication information is associated with an identifier of the wireless backup system. Also included is a network component comprising a first passive optical network (PON) component configured to receive authentication information for a wireless backup system for a PON from a second PON component and compare the authentication information to expected authentication information at the first PON component to authorize a wireless link between the first PON component and the second PON component for the wireless backup system. | 10-27-2011 |
| 20110255859 | METHOD AND SYSTEM FOR PROVIDING FAULT RECOVERY USING COMPOSITE TRANSPORT GROUPS - An approach is provided for performing fault recovery using composite transport groups (CTGs). A first logical channel is established within a composite transport group, wherein the first logical channel is established over a first link associated with a first service provider to a customer premise equipment (CPE) node configured to transport packets. A second logical channel is established within the composite transport group, wherein the second logical channel is established over a second link associated with a second service provider to an optical node. Packets are received over the first logical channel. Packets are received over the second logical channel if the first logical channel experiences a fault condition, wherein switching to the second logical channel is transparent to the CPE node. | 10-20-2011 |
| 20110217035 | Protection Mechanism for a Communications Network - The invention relates to a protection mechanism for a communications network. A node, a method, a computer program product and a communications network to provide protection for an optical communications network are disclosed. Communications traffic is selecting from a working path in the optical network. A first fault condition is determining on the working path. The communications traffic is selected from a protection path in the optical network in response to clearing of the first fault and determining a second fault condition on the working path within a first predetermined time period of determining the first fault condition. | 09-08-2011 |
| 20090290867 | METHOD AND APPARATUS FOR CHANNEL PROTECTION SWITCHING OF OPTICAL NETWORK DEVICE - A method for channel protection switching of an optical network device, an Optical Transport Network (OTN) device, and a Passive Optical Network (PON) device is provided. The method includes detecting, by the PON device, whether an OTN alarm indication signal is received after discovering a fault. If the OTN alarm indication signal is received, the alarm generated by the PON device is screened so that the PON device does not perform channel protection switching. The PON device detects whether an OTN alarm indication signal is received, and screens off the alarm generated by the PON device so that the PON does not generate futile alarms or lead to futile switching when the OTN fails but the PON works normally. | 11-26-2009 |
| 20120308224 | Standby Restoration Signaling For Optical Networks - Systems and methods are described that provide a distributed restoration signaling protocol for shared mesh restoration with standbys for transparent optical networks. | 12-06-2012 |
| 20110116790 | WAVELENGTH PATH COMMUNICATION NODE APPARATUS, WAVELENGTH PATH COMMUNICATION CONTROL METHOD, PROGRAM, AND RECORDING MEDIUM - A wavelength path communication node apparatus includes a wavelength path demultiplexer ( | 05-19-2011 |
| 20120148230 | Method for Time Division Multiplex Service Protection - The present application provides a method for time division multiplex service protection. The method includes: on an OLT in a passive optical network, a working uplink port and a protection uplink port are set for a time division multiplex service and a protection group is created for the working uplink port and the protection uplink port; when a service flow protection for the time division multiplex service is triggered, the time division multiplex service flow is switched from the working uplink port to the protection uplink port, therefore realizing the protection for the time division multiplex service flow. The present application provides an uplink channel protection mechanism for important services in an access system, such as the time division multiplex service, which needs no protection switching protocol, and makes the service recovery time stand within 50 ms, thereby realizing fast and nondestructive recovery of the time division multiplex service. | 06-14-2012 |
| 20110097077 | OPTICAL TRANSMISSION SYSTEM - A redundant optical transmission system for transmitting a gigabit Ethernet signal is disclosed. The system includes network devices having the auto negotiation function and transponders having the auto negotiation function based on the Ethernet standard. Upon occurrence of a fault in the optical signal path, a line fault such as the link disconnection with a network device is detected and the corresponding information is transferred to the opposite station. The opposite station restarts the auto negotiation with the network device, thereby positively repairing the line disconnection between the network devices. | 04-28-2011 |
| 20120251097 | PASSIVE ARCHITECTURAL OPTICAL DISTRIBUTION NETWORK - Passive optical networks can experience faults that are unrecoverable. An embodiments of the present invention is a hybrid passive optical network configured to protect a primary optical path employing a switch to transmit data from the primary path to a secondary path in a passive manner. In an event data flows through both the primary path and the secondary path, the optical switch may be configured to monitor the primary path. In such an embodiment, the optical switch is a protection optical switch that is sensitive to monitoring an optical signal that flows on the primary path. If the switch detects a loss of signal on the primary path, the optical switch automatically switches delivery of the optical signal from the primary path to the secondary path, via the optical switch to allow an optical line terminal to receive optical signals virtually uninterrupted. | 10-04-2012 |
| 20120257886 | METHOD AND DEVICE FOR IMPLEMENTING SHARED MESH PROTECTION AND OPTICAL NETWORK SYSTEM - Embodiments of the present invention disclose a method for implementing shared mesh protection includes: receiving, by a first node, a message of a second type sent by a second node, where the message of the second type carries a second positive incoming sublabel allocated by the second node for a protection path of a first service and the second positive incoming sublabel is used to indicate a specified feature of recovery information of the first service; allocating, by the first node, a first positive outgoing label for the protection path of the first service based on the second positive incoming sublabel, where the first positive outgoing label corresponds to the second positive incoming sublabel; and transmitting the recovery information of the first service to the second node based on an indication of the first positive outgoing sublabel when knowing that a working path of the first service is faulty. | 10-11-2012 |
| 20120121249 | SYSTEMS AND METHODS OF OPTICAL PATH PROTECTION FOR DISTRIBUTED ANTENNA SYSTEMS - Systems and methods for optical path protection for distributed antenna systems are provided. In one embodiment, a system comprises a hub and at least one node located remotely from the hub. The hub is coupled to the node by first and second fiber paths, the first fiber path comprising an uplink fiber and a downlink fiber, the second fiber path comprising an uplink fiber and a downlink fiber. The node is coupled to the downlink fibers of the first and second fiber paths via an optical combiner, and is further coupled to the uplink fibers of the first and second fiber paths via an optical splitter. The node further monitors a signal quality of a downlink optical signal and communicates to the hub information indicative of the signal quality. The hub switches communications between the hub and the node from the first to second fiber path based on the information. | 05-17-2012 |
| 20120134663 | SYSTEM AND METHOD FOR MANAGING OPTICAL SYSTEM FAILURE - A reflector assembly is disclosed that may include a housing; a fiber stud disposed within the housing; a filter lens having an OTDR reflective layer, the filter lens located downstream from the fiber stud and receiving light energy from the fiber stud, and configured to be transparent for light within a communication wavelength band and reflective within a diagnostic wavelength band. | 05-31-2012 |
| 20120134664 | JOINT SWITCHING METHOD FOR AN AGGREGATION NODE, AGGREGATION NODE AND SYSTEM - A joint switching method for an aggregation node, an aggregation node, and an optical network protection system including an aggregation node are provided. By monitoring information transferred between an active optical line terminal (OLT) and a broadband network gateway (BNG), the aggregation node finds a fault in time according to the monitored information and when a fault occurs, the aggregation node starts a local protection solution, enables a corresponding backup port connected to a backup OLT corresponding to the active OLT, and disables an active port connected to the active OLT. Through the method, when the active OLT is switched to the backup OLT, the aggregation node performs joint switching, which ensures normal communication. | 05-31-2012 |
| 20120170925 | PROTECTION DEVICE AND PROTECTION METHOD FOR OPTICAL NETWORK - Optical network protection devices and protection methods including: a working line; a protection line; a determination module configured to determine the protection type of optical network; a first judgment module configured to judge whether the working line is normal according to performance parameter values of service signal in the working line and switching conditions configured for multiplexing section protection when the protection type of optical network is the multiplexing section protection; a second judgment module, configured to judge whether the working line is normal according to performance parameter values of service signal in the working line and switching conditions configured for channel section protection when the protection type of optical network is the channel section protection; a switching module, configured to take the service signal in the protection line as an output signal when working line is abnormal. | 07-05-2012 |
| 20120076489 | Optical Amplifier Protection Switch - The rapid switching of optical fiber communication between one or two working optical amplifiers and one protect optical amplifier is accomplished using fast optical fiber switching and alarm detection circuits that protects the loss of communication due to amplifier failure. | 03-29-2012 |
| 20120263453 | METHOD FOR SUPPORTING SNCP OVER PACKET NETWORK - A method is presented for supporting SNCP over a packet network connecting to two SDH sub-networks and transporting one or more SDH paths that are SNCP-protected in both SDH sub-networks. The packet network connects to each of two sub-network interconnection points by a working path and a protection path. The packet sub-network may provide the same type of path protection as an SDH sub-network using SNCP, while avoiding bandwidth duplication. | 10-18-2012 |
| 20120082448 | SYSTEM AND METHOD FOR SPARING CHANNELS OF A MULTI-WAVELENGTH TRANSPONDER - In accordance with an embodiment, a method for sparing channels in a wavelength division multiplexing (WDM) transponder comprises transmitting network traffic, over a plurality of active channels, wherein each active channel is associated with an active transmitter. Determining that one or more active transmitters have failed and switching traffic from the channels associated with the failed transmitters to first spare channels, wherein the first spare channels are associated with a plurality of first spare transmitters included in a first spare WDM module. Switching traffic from the channels associated with the failed transmitters to second spare channels. The second spare channels are associated with a plurality of second spare transmitters included in a second spare WDM module to allow for a plurality of active transmitters to fail before requiring immediate replacement of an active WDM module with at least one failed transmitter. | 04-05-2012 |
| 20110002687 | SYSTEMS AND METHODS OF OPTICAL PATH PROTECTION FOR DISTRIBUTED ANTENNA SYSTEMS - Systems and methods for optical path protection for distributed antenna systems are provided. In one embodiment, a method is provided. The method comprises receiving an electrical uplink radio frequency signal; generating an uplink optical signal derived from the electrical uplink radio frequency signal; splitting the uplink optical signal for transmission on a primary uplink optical fiber and a secondary uplink optical fiber; combining any downlink optical signal received on a primary downlink optical communication medium and any downlink optical signal received on a second downlink optical communication medium in order to output a downlink optical signal; and generating a downlink radio frequency signal derived from the downlink optical signal. | 01-06-2011 |
| 20120237200 | METHOD AND SYSTEM FOR INCREASING TRANSPONDER SHARING FOR MESH RESTORATION IN A COMMUNICATION NETWORK - In accordance with embodiments of the present disclosure, a method may include for each particular working demand in a communication network, calculating a dedicated backup path for a working path of the particular working demand such that each particular backup path does not include links present in the working path. The method may also include, for each particular working demand: (i) assigning to the backup path a wavelength associated with the particular working demand; and (ii) assign to the backup path a transponder at each of the source and destination of the backup path associated with the wavelength; such that the backup path for at least one particular working demand is assigned a transponder that is also assigned to the backup path for at least one other particular working demand. | 09-20-2012 |
| 20120321296 | LIGHT PATH CHARACTERIZATION, TRAFFIC PROTECTION, AND WAVELENGTH DEFRAGMENTATION - A method for managing an optical network having a plurality of nodes interconnected by a plurality of fiber links includes installing one or more active reconfigurable optical add/drop multiplexer (ROADM) cards into a node and installing a spare ROADM card into the node. The one or more active ROADM cards are configured to pass optical traffic to and from the optical network. The installed spare ROADM card is remotely activated to pass optical traffic to and from the optical network, subsequent to configuring the one or more active ROADM cards, based on one of: an event or expiration of a time period. | 12-20-2012 |
| 20100232784 | DUAL FAULT TOLERANT OPTICAL NETWORKING WITH FAST PROTECTION PERFORMANCE - Optical networks occasionally experience a fault along a communications path. Service providers prefer to have an alternative communications path available to enable users to still communicate in a seamless manner. Accordingly, a method and corresponding apparatus for providing path protection for dedicated paths in an optical network is provided. | 09-16-2010 |
| 20120281978 | Protection System, Method and Apparatus for Optical Network - The invention discloses a system, a method and an apparatus for optical network protection. The system includes: an output control apparatus for obtaining protection mode information configured by a system and controlling an input signal to be output from a set line corresponding to said protection mode information; and a detection control apparatus for detecting powers of signals transmitted on an active line and on a standby line, if it is determined that said active line is abnormal and said standby line is normal according to detection results, then controlling said input signal to be output from a protection line corresponding to said protection mode information; if it is determined that said active line is normal, or that said active line and said standby line are abnormal according to the detection result, then controlling said input signal to be output from a set line corresponding to the protection mode information. | 11-08-2012 |
| 20110311217 | OPTICAL TRANSMISSION APPARATUS - An optical transmission apparatus that protects different types of signals with a common backup transponder. The optical transmission apparatus includes working transponder units that relay respective optical signals on corresponding working transmission lines to or from external client devices, a backup transponder unit that can relay optical signals of different interface types, a 3:1 optical switch unit and a 1:3 optical switch unit that connect the external client devices and the working transponder units, and can connect the external client device and the backup transponder unit, and a monitor control unit that monitors occurrence of a failure in the working transponder units and the backup transponder unit, and controls switching of the transmission lines upon detection of a failure. | 12-22-2011 |
| 20120328282 | Network Restoration Under Link or Node Failure Using Preconfigured Virtual Cycles - The design of telecommunication networks is such that there is provision of end-to-end path protection to multiple demands under a single link or node failure in the networks. Restoration routes are provided on Preconfigured Virtual Cycles (PVC's), where each demand is assigned one restoration route and specific restoration wavelengths on a segment of one cycle. Multiple demands may share restoration wavelengths, and the number of restoration wavelengths may vary among the PVC links. First, a plurality of candidate PVC's are generated where each demand may be assigned to multiple candidates. Assignment of demands with common failure scenarios are allowed, under certain conditions, to the same PVC. Next, a set of PVC's is selected from among the candidates, while minimizing total reserved restoration capacity and ensuring that all demands are protected. Next duplicate assignments are eliminated. Finally, conflicts of wavelength assignments are resolved. The invention focuses primarily on optical networks. | 12-27-2012 |
