# US 11,451,294 B2 · Method and system to prevent false restoration and protection in optical networks with a sliceable light source > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,451,294 B2 - Document ID: US11451294B2 - Status: Granted - Kind: B2 - Application number: 16/152,051 - Filed: 2018-10-04 - Published: 2020-04-09 - Granted: 2022-09-20 - Earliest claimed: 2018-10-04 - Assignees: Infinera Corporation - Applicants: Infinera Corp. - Inventors: Amit Satbhaiya; Nikhil Kumar Satyarthi; Sanjeev Ramachandran; Rajan Rao; Baranidhar Ramanathan - Web page: https://patentgrep.com/patent/US11451294B2 ## CPC - H04B 10/0791: {Fault location on the transmission path} - H04J 14/0287: {Protection in WDM systems} - H04B 10/07955: {Monitoring or measuring power} - H04B 10/66: Non-coherent receivers, e.g. using direct detection - H04J 14/0272: {Transmission of OAMP information} - H04B: TRANSMISSION - H04J: MULTIPLEX COMMUNICATION (transmission in general H04B; peculiar to transmission of digital information H04L5/00; systems for the simultaneous or sequential transmission of more than one television signal H04N7/08; in exchanges H04Q11/00; stereophonic systems H04S) ## 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. ## Claims ### Claim 1 A node, comprising: a light source generating multiple wavelengths of light composing multiple super channels, each of the multiple super channels being a group of the multiple wavelengths that are routed together through a first path; a routing card having a first input port, a first photo detector at the first input port, and an output port, the first input port receiving the light and directing the multiple super channels of light composing the light of the one or more of the multiple super channels to the output port, the first photo detector generating a first signal indicative of only one of a presence or absence of the light of the multiple super channels; a multiplexer having a second input port receiving the light of one or more of the multiple super channels from the routing card, a second photo detector at the second input port; and an optical power monitoring device, the optical power monitoring device receiving light of the one or more of the multiple super channels, measuring the light on a per band basis, and detecting an optical loss of signal within the one or more of the multiple super channels, the optical power monitoring device generating a second signal indicative of the optical loss of signal, the second photo detector generating a third signal indicative of only one of a presence or absence of the light of the one or more of the multiple super channels; and a first patch cable connecting the light source to the first input port of the routing card; a second patch cable connecting the output port of the routing card to the second input port of the multiplexer; and a controller having circuitry executing a fault detection algorithm that receives the first signal, the second signal, and the third signal, receives information indicative of a patch cable network configuration of the first and second patch cables, and determines whether the optical loss of signal detected by the optical power monitoring device is a failure at the light source. ### Claim 2 (depends on 1) The node of claim 1, wherein the fault detection algorithm determines that the optical loss of signal detected by the optical power monitoring device is the failure at the light source by based upon the first signal indicating that the first photo detector is part of the routing card, and the first signal indicating the absence of the light of the multiple super channels. ### Claim 3 (depends on 1) The node of claim 1, wherein the fault detection algorithm determines that the optical loss of signal detected by the optical power monitoring device is the failure at the source based upon the third signal being indicative of the presence of the light of the one or more of the multiple super channels. ### Claim 4 (depends on 1) The node of claim 1, wherein the fault detection algorithm determines that the multiplexer is associated next to the routing card, and the third signal being indicative of the presence of the light of the one or more of the multiple super channels. ### Claim 5 A transport network, comprising: a first node; a second node; an optical fiber connecting the first node to the second node, the optical fiber having an optical supervisory channel; wherein the first node comprises: a light source generating multiple wavelengths of light composing multiple super channels, each of the multiple super channels being a group of the multiple wavelengths that are routed together through a first path; a routing card having a first input port, a first photo detector at the first input port, and an output port, the first input port receiving the light and directing the multiple wavelengths of light composing the light of the multiple super channels to the output port, the first photo detector generating a first signal indicative of only one of a presence or absence of the light of the multiple super channels; a multiplexer having a second input port receiving the light of the one or more of the multiple super channels from the routing card, a second photo detector at the second input port; and an optical power monitoring device, the optical power monitoring device receiving light of the one or more of the multiple super channels, measuring the light on a per band basis, and detecting an optical loss of signal within the one or more of the multiple super channels, the optical power monitoring device generating a second signal indicative of the optical loss of signal, the second photo detector generating a third signal indicative of only one of a presence or absence of the light of the one or more of the multiple super channels; and a first patch cable connecting the light source to the first input port of the routing card; a second patch cable connecting the output port of the routing card to the second input port of the multiplexer; and a controller having circuitry executing a fault detection algorithm that receives the first signal, the second signal, and the third signal, receives information indicative of a patch cable network configuration of the first and second patch cables, and determines whether the optical loss of signal detected by the optical power monitoring device is a failure at the light source; and an optical supervisory channel transmitter receiving a signal indicative of the failure at the source, and inserting a client signal failure signal onto the optical supervisory channel of the optical fiber. ### Claim 6 (depends on 5) The transport network of claim 5, wherein the fault detection algorithm determines that the optical loss of signal detected by the optical power monitoring device is the failure at the light source by based upon the first signal indicating that the first photo detector is part of the routing card, and the first signal indicating the absence of the light of the one or more of the multiple super channels. ### Claim 7 (depends on 5) The transport network of claim 5, wherein the fault detection algorithm determines that the optical loss of signal detected by the optical power monitoring device is the failure at the source based upon the third signal being indicative of the presence of the light of the one or more of the multiple super channels. ### Claim 8 (depends on 5) The transport network of claim 5, wherein the fault detection algorithm determines that the multiplexer is associated next to the routing card, and the third signal being indicative of the presence of the light of the one or more of the multiple super channels.