Patent application number | Description | Published |
20080240713 | METHOD AND APPARATUS FOR AUTOMATIC RESTORATION DETECTION AND AUTOMATIC RESTORATION OF OPTICAL COMMUNICATION SYSTEM - Methods and apparatuses for automatic restoration detection and automatic restoration of optical communication system are disclosed. In the methods, a first station sends an automatic restoration detection message to a second station at the opposite side of a failed link; in response to receiving an automatic restoration request message, determines that the link has been repaired in two directions, and sends an automatic restoration confirmation message to the second station; or in response to receiving the automatic restoration detection message, determines that the link from the second station to the first station has been repaired, and sends the automatic restoration request message to the second station; in response to receiving the automatic restoration confirmation message, determines that the link has been repaired in two directions; and switching to normal working states. The safety problem that the laser leakage occurs in the failed link is solved. | 10-02-2008 |
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 |
20080310858 | APPARATUS AND METHOD OF OPTICAL COMPENSATION FOR SUBMARINE OPTICAL CABLE - The present invention provides optical compensation for a submarine optical cable optical. A dummy light module generates a dummy light signal according to a continuous spectrum in a predetermined range and a combining module combines a service signal with the dummy light signal. When the dummy light is used for the compensation, conventional problems are solved, including complicated control, difficult realization of the pre-equalization function and inflexible configuration. When service signals are increased, the adjustment for the power of the dummy light signal is avoided; therefore, the control for the dummy light is simplified. In the pre-equalization operation, power control is only performed on the dummy light signal in the single channel or the continuous dummy light signal; therefore, the realization of the pre-equalization function is easy. | 12-18-2008 |
20090010641 | METHOD AND APPARATUS FOR LOADING, DETECTING, AND MONITORING CHANNEL-ASSOCIATED OPTICAL SIGNALS - A method and apparatus for loading, detecting, and monitoring channel-associated signals are provided. Channel-associated signals are identified with spread spectrum codes in the electrical domain, and after being modulated to an optical service signal at respective loading points separately, the channel-associated identification signals are transmitted in the optical channel along with the optical signal. At any downstream detecting point, passing optical signals can be converted through photoelectric conversion, and the channel-associated identification signals are de-spread. By detecting the channel-associated signals, it is possible to learn about whether the upstream loading point work normally, whether the optical channel operates normally, etc., and thereby to find possible failures, solve problems, and monitor quality parameters of optical signals in real time, and improve reliability of the optical signal transmission. | 01-08-2009 |
20090324214 | Method, Apparatus and System for Handling Fiber Line Fault - A method for handling a fiber line fault is provided. The method includes: loading, by a station, an indication signal carrying alarm suppression information onto an optical signal to be output to a downstream fiber of the station upon detection of a fault on upstream fiber line; keeping in a normal working status, by a downstream station upon a receipt of the optical signal with the indication signal. The various embodiments of the present disclosure suppress alarms from downstream amplifier stations which are not adjacent to the failure link and further suppress APR or APSD procedures according to the alarms. | 12-31-2009 |
20100142960 | UPGRADING METHOD, SYSTEM AND APPARATUS OF LOW-DENSITY WAVELENGTH DIVISION MULTIPLEXING SYSTEM - An upgrading method, a system, and an apparatus of a low-density wavelength division multiplexing (WDM) system are provided. The method includes: detecting an output wavelength shift of a wavelength conversion unit, and adjusting an output wavelength of the wavelength conversion unit having the output wavelength shift higher than a threshold, so that the output wavelength shift of the wavelength conversion unit is lower than the threshold; adjusting an adjustable interleaved demultiplexer, until requirements for a demultiplexing parameter of a high-density WDM system are met. Thus, the problem that services are interrupted when a low-density MDM system is upgraded to a high-density MDM system is solved. A WDM system, and a wavelength multiplexing/demultiplexing apparatus and method are also provided. | 06-10-2010 |
20130094523 | TIME SYNCHRONIZATION METHOD AND SYSTEM, AND NODE DEVICE - The present disclosure discloses a time synchronization method. In the method, a first node sends a first time packet at a first time over a first working wavelength; a second node receives the first time packet at a second time. The first node sends a second time packet at a third time over a second working wavelength. The second node receives the second time packet at a fourth time; calculates an absolute time deviation between the second node and the first node according to the first time, the second time, the third time, the fourth time, a first signal transmission rate corresponding to the first working wavelength, and a second signal transmission rate corresponding to the second working wavelength, and synchronizes the local time between the second node and the first node. Further, a time synchronization system and a node device are disclosed. | 04-18-2013 |
20140099119 | Transport Functions Virtualization for Wavelength Division Multiplexing (WDM)-based Optical Networks - A method for virtualizing an optical network, comprising: abstracting optical resource information corresponding to resources within the optical network, constructing a plurality of candidate paths for one or more optical reachability graph (ORG) node pairs, determining whether the candidate paths are optical reachable paths, and creating an ORG link between each ORG node pair when at least one optical reachable path exists for the ORG node pair, wherein linking the ORG node pairs creates an ORG. In another embodiment, a computer program product comprising executable instructions when executed by a processor causes a node to perform the following: determine an optical network's optical-electrical-optical (OEO) conversion capability, partition a plurality of service sites into one or more electrical reachability graph (ERG) nodes, determine a grooming capability for each ERG node, and construct a plurality of electrical-layer reach paths between the ERG nodes to form an ERG. | 04-10-2014 |
20150023354 | METHOD AND DEVICE FOR ALLOCATING PACKET SWITCHING RESOURCE - Embodiments of the present invention provide a method and a device for allocating a packet switching resource, which includes: receiving, by a management plane unit, a service transport request carrying service information, where the service information includes source node information, sink node information, quality of service QoS requirement information, and bandwidth requirement information; determining, by the management plane unit, at least one transport path according to the service information and a preset resource allocation policy, and generating a routing table entry/forwarding table entry according to the at least one transport path; and sending, by the management plane unit, the routing table entry/forwarding table entry to data plane units of packet switching devices of each transport path of the at least one transport path. According to the embodiments, transparent and controllable allocation of a network bandwidth resource is implemented, so that utilization efficiency of a network resource is improved. | 01-22-2015 |