Patents by Inventor Rajan Rao

Rajan Rao has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Publication number: 20210226697
    Abstract: A regen node is described. The regen node includes a coherent receiver, a control module and a coherent transmitter. The coherent receiver has circuitry to convert a first optical signal received from an upstream node in an optical layer of an optical network to a first digital data stream in a digital layer having a first FEC frame and a data traffic. The control module extracts a first fault signal from the first FEC frame; generates a second fault signal based at least in part on the first fault signal; and encodes the second fault signal within a second FEC frame with the data traffic into a second digital data stream on the digital layer. The coherent transmitter has circuitry to convert the second digital data stream into a second optical signal on the optical layer and to transmit the second optical signal to a downstream node.
    Type: Application
    Filed: August 20, 2020
    Publication date: July 22, 2021
    Inventors: Rajan Rao, Ramakrishna Pratapa, Ramnarayan Srinivasan, Ashok Khunjidhapatham, Radhakrishna Valiveti
  • Publication number: 20210143904
    Abstract: An optical network having a first terminal node, a second terminal node, and a network service system is described. The first terminal node has a plurality of ports and a signal restoration component to create a restored path. The second terminal node has a plurality of ports and a failure monitor to issue a path failure notice. A working path, a protection path, and the restored path are each fiber optic lines optically coupling the first terminal node to the second terminal node to enable a service, each path requiring a quantity of exclusive licenses. The network service system receives a path failure notice indicating a working path failure, calculates the quantity of licenses required by the restored path, releases the quantity of licenses required by the working path and applies at least a portion of the quantity of licenses to the quantity of licenses required by the restored path.
    Type: Application
    Filed: December 31, 2019
    Publication date: May 13, 2021
    Inventors: Rajan Rao, Wayne Wauford, Vinesh Raghavan, Prasanjeet Khuntia
  • Patent number: 10824351
    Abstract: Systems and methods are described in which circuitry of a first controller of a first node receives a first signal indicating an optical loss of signal within the first path. Circuitry of a second controller of the first node on the first path within a transport network generates a second signal indicating a failure within the first path. The first controller accessing a network topology database determines that restoration of the first path would be ineffective due to there being no alternate path, and signals a second node downstream in the first path with the second signal indicating the failure within the first path, and a third signal indicating that restoration of the first path would be ineffective due to there being no alternate path.
    Type: Grant
    Filed: August 17, 2018
    Date of Patent: November 3, 2020
    Assignee: Infinera Corporation
    Inventors: Nikhil Kumar Satyarthi, Amit Satbhaiya, Sanjeev Ramachandran, Rajan Rao, Baranidhar Ramanathan
  • Patent number: 10797824
    Abstract: Methods, nodes and control modules are disclosed. In the method, circuitry of a first node in a mesh network converts an optical layer in a working path between the first node and a second node, to a data stream in a digital layer. The working path carries data traffic from the first node to the second node in the optical layer of the mesh network when there is no failure in the working path. Circuitry of the first node in the mesh network detects a failure in the working path due to detection of an error in the data stream in the digital layer. The circuitry of the first node establishes, through transmission of at least one signal from the first node to the second node, a restoration path in the optical layer based on, at least in part, detection of the error in the data stream in the digital layer.
    Type: Grant
    Filed: June 5, 2018
    Date of Patent: October 6, 2020
    Assignee: Infinera Corporation
    Inventors: Rajan Rao, Ashok Kunjidhapatham, Ashwini Kumar Bhat, Baranidhar Ramanathan, Sanjeev Ramachandran, Nikhil Satyarhi, Saratchandar Adayapalam Viswanathan, Biao Lu, Amit Satbhaiya, Ramnarayan Srinivasan, Ramakrishna Pratapa
  • Publication number: 20200112365
    Abstract: A transport network, a node, and a method are disclosed. The transport network, the node, and the method detect a failure of a super channel originating from a sliceable light source that is routed through the transport network, by detecting an optical loss of signal by an optical power monitoring device, in presence or absence of an optical loss of signal of the complete band by at least one photo detector. This information is analyzed with a fault detection algorithm using a patch cable network configuration to determine a fault indication for a failure within the first node. The fault signal indicative of the fault indication is then passed to another node on the first path.
    Type: Application
    Filed: October 4, 2018
    Publication date: April 9, 2020
    Inventors: Amit Satbhaiya, Nikhil Kumar Satyarthi, Sanjeev Ramachandran, Rajan Rao, Baranidhar Ramanathan
  • Patent number: 10602246
    Abstract: Embodiments herein include methods and apparatuses for providing optical channel protection by a switching controller in an optical networking system. The switching controller may receive, from a light module, a digital fault status message that indicates whether a digital frame demodulated from an optical signal include a fault. The switching controller may receive from an Optical Supervisory Channel (OSC) module, an Optical Layer Defect Propagation (OLDP) status message that indicates an OSC status of the optical signal on a current optical path. The switching controller may receive, from an Optical Add Drop Multiplexer (OADM) module, an optical power status message that indicates a measured power level of the optical signal on the optical path. Based on at least one of the OLDP status, the optical power status, or the digital fault status message, the switching controller may determine the optical path as a working path or a protecting path.
    Type: Grant
    Filed: May 22, 2017
    Date of Patent: March 24, 2020
    Assignee: Infinera Corporation
    Inventors: Rajan Rao, Nikhil Kumar Satyarthi, Ashok Kunjidhapatham, Baranidhar Ramanathan, Biao Lu
  • Patent number: 10587500
    Abstract: Memory devices, methods and systems are described in which a non-transitory memory device stores instructions that, when executed by a processor, cause the processor to: receive, via an input component, at least one message from a network element in a multi-layer network comprising information indicative of at least one failure of a working path; determine based at least in part on information indicative of a data transport path coincident with the working path in a second layer in the network different from the first layer, an alternate path in the first layer for transmission of the data through the multi-layer network; and transmit, via an output component, at least one signal comprising configuration instructions to at least one line module, the configuration instructions directing the line module to switch and transmit the data using the alternate path.
    Type: Grant
    Filed: April 7, 2017
    Date of Patent: March 10, 2020
    Assignee: Infinera Corporation
    Inventors: Abishek Gopalan, Rajan Rao, Biao Lu
  • Publication number: 20200059712
    Abstract: A system and method is disclosed in which circuitry of a first controller of a first node on a first path within a transport network receives a first signal indicating a failure within the first path from a second controller. The first node is an end node of the first path. A first client signal failure clear signal is received from a second node upstream of the first node on the first path. The first client signal failure clear signal indicates that a non-restorable fault has been resolved such that the first path can be considered for carrying data traffic. The non-restorable fault is a failure at the source. Subsequent to receiving the first signal indicating the failure within the first path, a backward defect indication clear signal is transmitted to the second node, the backward defect indication clear signal indicating an absence of a failure in the first path.
    Type: Application
    Filed: August 17, 2018
    Publication date: February 20, 2020
    Inventors: Nikhil Kumar Satyarthi, Amit Satbhaiya, Sanjeev Ramachandran, Rajan Rao, Baranidhar Ramanathan, Dileep Padala, Dinesh Kumar Prakasam
  • Patent number: 10455301
    Abstract: A method, comprises measuring, by circuitry of a computer system, a first bandwidth of data traffic of a transport path over a time period, the transport path passing through a plurality of nodes and conforming to a protocol using a number of time slots to allocate a second bandwidth to the transport path. The method further includes passing a signal, from the computer system to at least one of the nodes of the transport path, the signal including at least one instruction that when executed by circuitry of the at least one node causes a change to the number of time slots allocated to the transport path.
    Type: Grant
    Filed: June 28, 2013
    Date of Patent: October 22, 2019
    Assignee: Infinera Corporation
    Inventors: Satyajeet Ahuja, Ping Pan, Rajan Rao, Biao Lu
  • Patent number: 10447420
    Abstract: Embodiments include methods and apparatuses for providing at least one signaling indication of a super-channel by a power controller in a Wavelength Division Multiplexing (WDM) system. The power controller may receive a service provisioning and a lock state from a network management entity. The power controller may receive, from an optical fabric unit, a fabric state that indicates whether a pass-band of the super-channel is provisioned. The power controller may receive the power level of the super-channel from a power monitoring unit. Based on the power level and attenuation level of the super-channel, the power controller may determine a ramp state that indicates whether the power level reached to a predetermined power. The power controller may determine an alarm state based on the power level. The power controller may determine the signaling indication based on the service provisioning, lock, fabric, ramp, and alarm states.
    Type: Grant
    Filed: June 5, 2017
    Date of Patent: October 15, 2019
    Assignee: Infinera Corporation
    Inventors: Rajan Rao, Nikhil Kumar Satyarthi, Parveen Kumar Gupta, Sowmya Mahadevaiah, Sanjeev Ramachandran, Baranidhar Ramanathan, Ramakrishnan Subramanian
  • Patent number: 10320510
    Abstract: A method and node are disclosed. In the method, circuitry of a first node generates a link state advertising message including bandwidth information indicative of unreserved number of optical channel data unit containers for a plurality of different types of signals supported by an interface of the first node. The link state advertising message is transmitted from the first node to a plurality of second nodes within a mesh network.
    Type: Grant
    Filed: March 29, 2011
    Date of Patent: June 11, 2019
    Assignee: Infinera Corporation
    Inventors: Snigdho C. Bardalai, Rajan Rao, Ashok Kunjidhapatham, Khuzema Pithewan, Biao Lu, Ping Pan, Radhakrishna Valiveti
  • Patent number: 10277965
    Abstract: A method and system are disclosed in which a link state advertisement message (LSA) conforming to a Generalized Multiprotocol Label Switching (GMPLS) routing protocol is generated and transmitted. The LSA is associated with a TE Link between a transmit node and a receive node in a network. The transmit node supplies a plurality of optical signals, each of which has a plurality of frequencies, the frequencies being allocated among a plurality of spectral portions such that the plurality of spectral portions are grouped into a plurality of frequency slots. The LSA may include information indicative of a number of spectral portions, e.g., spectral slices, which correspond to frequencies of selected ones of the plurality of optical signals, said selected ones of the plurality of optical signals being available to carry data from the transmit node to the receive node.
    Type: Grant
    Filed: September 13, 2015
    Date of Patent: April 30, 2019
    Assignee: Infinera Corporation
    Inventors: Abinder Dhillon, Iftekhar Hussain, Rajan Rao, Marco Sosa
  • Publication number: 20190007131
    Abstract: Systems and methods are described in which circuitry of a first controller of a first node receives a first signal indicating an optical loss of signal within the first path. Circuitry of a second controller of the first node on the first path within a transport network generates a second signal indicating a failure within the first path. The first controller accessing a network topology database determines that restoration of the first path would be ineffective due to there being no alternate path, and signals a second node downstream in the first path with the second signal indicating the failure within the first path, and a third signal indicating that restoration of the first path would be ineffective due to there being no alternate path.
    Type: Application
    Filed: August 17, 2018
    Publication date: January 3, 2019
    Inventors: Nikhil Kumar Satyarthi, Amit Satbhaiya, Sanjeev Ramachandran, Rajan Rao, Baranidhar Ramanathan
  • Publication number: 20180351694
    Abstract: Methods, nodes and control modules are disclosed. In the method, circuitry of a first node in a mesh network converts an optical layer in a working path between the first node and a second node, to a data stream in a digital layer. The working path carries data traffic from the first node to the second node in the optical layer of the mesh network when there is no failure in the working path. Circuitry of the first node in the mesh network detects a failure in the working path due to detection of an error in the data stream in the digital layer. The circuitry of the first node establishes, through transmission of at least one signal from the first node to the second node, a restoration path in the optical layer based on, at least in part, detection of the error in the data stream in the digital layer.
    Type: Application
    Filed: June 5, 2018
    Publication date: December 6, 2018
    Inventors: Rajan Rao, Ashok Kunjidhapatham, Ashwini Kumar Bhat, Baranidhar Ramanathan, Sanjeev Ramachandran, Nikhil Satyarhi, Saratchandar Adayapalam Viswanathan, Biao Lu
  • Patent number: 9923805
    Abstract: One or more nodes, in a network, are configured to transmit a message, for computing diverse paths through the network from a first domain to a second domain using a Resource Reservation Protocol-Traffic Engineering (RSVP-TE) signaling protocol; generate at least one data structure that identifies multiple diverse entry points to the second domain; transmit the at least one data structure toward the first domain; complete the at least one data structure to form at least one completed data structure; use a first data structure, of the at least one completed data structure, to compute a primary path from the first domain to the second domain; and use a second data structure, of the at least one completed data structure, to compute a secondary path from the first domain to the second domain.
    Type: Grant
    Filed: March 22, 2013
    Date of Patent: March 20, 2018
    Assignee: Infinera Corporation
    Inventors: Snigdho Chandra Bardalai, Rajan Rao, Charles Andrew Palmer Moorwood
  • Publication number: 20170353264
    Abstract: Embodiments include methods and apparatuses for providing at least one signaling indication of a super-channel by a power controller in a Wavelength Division Multiplexing (WDM) system. The power controller may receive a service provisioning and a lock state from a network management entity. The power controller may receive, from an optical fabric unit, a fabric state that indicates whether a pass-band of the super-channel is provisioned. The power controller may receive the power level of the super-channel from a power monitoring unit. Based on the power level and attenuation level of the super-channel, the power controller may determine a ramp state that indicates whether the power level reached to a predetermined power. The power controller may determine an alarm state based on the power level. The power controller may determine the signaling indication based on the service provisioning, lock, fabric, ramp, and alarm states.
    Type: Application
    Filed: June 5, 2017
    Publication date: December 7, 2017
    Applicant: Infinera Corporation
    Inventors: Rajan Rao, Nikhil Kumar Satyarthi, Parveen Kumar Gupta, Sowmya Mahadevaiah, Sanjeev Ramachandran, Baranidhar Ramanathan, Ramakrishnan Subramanian
  • Patent number: 9831942
    Abstract: A method for receiving, by circuitry of an optical node adapted for wavelength multiplexing and wavelength switching, over an OSC an optical signal comprising overhead information indicative of status of at least one of an optical layer in an OTN; terminating the optical signal; notifying software of the status of the optical layer; detecting, based on the status of the optical layer, a uni-directional or bi-directional failure of a working path between the optical node and a second optical node, wherein the working path carries data traffic from the first optical node to the second optical node in the OTN when there is no failure in the working path; and switching, triggered by the uni-directional or bi-directional failure of the working path, to select the data traffic from a protection path, wherein the protection path carries data traffic between the optical node and the second optical node.
    Type: Grant
    Filed: March 31, 2015
    Date of Patent: November 28, 2017
    Assignee: Infinera Corporation
    Inventors: Rajan Rao, Biao Lu, Saurabh Kumar, Baranidhar Ramanathan, Parthiban Kandappan
  • Patent number: 9832107
    Abstract: A switch node provided with a switch, an input interface and an output interface. The input interface is adapted to couple to a first communication link to receive a first TDM frame having a user payload field containing a first user data from the first communication link, and a frame overhead field containing a first identification. The input interface is configured to validate the first identification in the frame overhead field and reject the first TDM frame responsive to the first identification being invalid, and to forward the first user data to the switch responsive to the first identification being valid. The output interface is adapted to couple to a second communication link. The output interface is configured to receive the first user data from the switch, and to generate a second TDM frame having a second user payload field containing the first user data, and a second frame overhead field containing a second identification that is different from the first identification.
    Type: Grant
    Filed: October 4, 2010
    Date of Patent: November 28, 2017
    Assignee: Infinera Corporation
    Inventors: Ping Pan, Rajan Rao, Biao Lu
  • Publication number: 20170338887
    Abstract: Embodiments herein include methods and apparatuses for providing optical channel protection by a switching controller in an optical networking system. The switching controller may receive, from a light module, a digital fault status message that indicates whether a digital frame demodulated from an optical signal include a fault. The switching controller may receive from an Optical Supervisory Channel (OSC) module, an Optical Layer Defect Propagation (OLDP) status message that indicates an OSC status of the optical signal on a current optical path. The switching controller may receive, from an Optical Add Drop Multiplexer (OADM) module, an optical power status message that indicates a measured power level of the optical signal on the optical path. Based on at least one of the OLDP status, the optical power status, or the digital fault status message, the switching controller may determine the optical path as a working path or a protecting path.
    Type: Application
    Filed: May 22, 2017
    Publication date: November 23, 2017
    Applicant: Infinera Corporation
    Inventors: Rajan Rao, Nikhil Kumar Satyarthi, Ashok Kunjidhapatham, Baranidhar Ramanathan, Biao Lu
  • Publication number: 20170295090
    Abstract: Memory devices, methods and systems are described in which a non-transitory memory device stores instructions that, when executed by a processor, cause the processor to: receive, via an input component, at least one message from a network element in a multi-layer network comprising information indicative of at least one failure of a working path; determine based at least in part on information indicative of a data transport path coincident with the working path in a second layer in the network different from the first layer, an alternate path in the first layer for transmission of the data through the multi-layer network; and transmit, via an output component, at least one signal comprising configuration instructions to at least one line module, the configuration instructions directing the line module to switch and transmit the data using the alternate path.
    Type: Application
    Filed: April 7, 2017
    Publication date: October 12, 2017
    Inventors: Abishek Gopalan, Rajan Rao, Biao Lu