# US 12,224,794 B2 · Optical time-domain reflectometer (OTDR) event detection and light power level measurement-based fiber optic link certification > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,224,794 B2 - Document ID: US12224794B2 - Status: Granted - Kind: B2 - Application number: 18/476,617 - Filed: 2023-09-28 - Published: 2024-01-18 - Granted: 2025-02-11 - Earliest claimed: 2020-11-05 - Assignees: Viavi Solutions Inc. - Applicants: Viavi Solutions Inc. - Inventors: Benoit Morel - Web page: https://patentgrep.com/patent/US12224794B2 ## CPC - H04B 10/071: using a reflected signal, e.g. using optical time domain reflectometers [OTDR] - H04B 10/07955: {Monitoring or measuring power} - H04B 10/27: Arrangements for networking - H04B: TRANSMISSION ## Abstract In some examples, OTDR event detection and light power level measurement-based fiber optic link certification may include performing, at one end of a device under test (DUT) of a network, a light power level measurement. An OTDR measurement may be performed at the one end of the DUT to detect at least one event associated with the DUT. Based on analysis of the light power level measurement and the OTDR measurement, an event classification may be generated to classify the at least one event associated with the DUT. ## Claims ### Claim 1 An apparatus comprising: a power meter, executed by at least one hardware processor, to perform, at one end of a device under test (DUT) of a network, a light power level measurement; an optical time-domain reflectometer (OTDR) event detector, executed by the at least one hardware processor, to perform, at the one end of the DUT, an OTDR measurement at a relatively short pulse width and at a relatively long pulse width to detect at least one event associated with the DUT; and an event classifier, executed by the at least one hardware processor, to generate, based on analysis of the light power level measurement and the OTDR measurement at the relatively short pulse width and at the relatively long pulse width, an event classification to classify the at least one event associated with the DUT. ### Claim 2 (depends on 1) The apparatus according to claim 1, wherein the DUT includes a section of a passive optical network (PON) between an optical network terminal (ONT) and a splitter. ### Claim 3 (depends on 1) The apparatus according to claim 1, wherein the power meter further comprises: a light power level analyzer, executed by the at least one hardware processor to: determine, based on an analysis of the light power level measurement, whether a light power level associated with the DUT is below a specified light power level; and generate, based on a determination that the light power level associated with the DUT is below the specified light power level, an indication that there is no light on a passive optical network (PON) wavelength. ### Claim 4 (depends on 1) The apparatus according to claim 1, wherein the OTDR event detector is to perform the OTDR measurement utilizing the relatively short pulse width to detect the at least one event associated with the DUT prior to performing the OTDR measurement utilizing the relatively long pulse width to detect the at least one event associated with the DUT. ### Claim 5 (depends on 3) The apparatus according to claim 3, wherein the event classifier is executed by the at least one hardware processor to generate, based on the analysis of the light power level measurement and the OTDR measurement at the relatively short pulse width and at the relatively long pulse width, the event classification to classify the at least one event associated with the DUT as an inactive optical line terminal (OLT). ### Claim 6 (depends on 1) The apparatus according to claim 1, wherein the event classifier is executed by the at least one hardware processor to generate, based on the analysis of the light power level measurement and the OTDR measurement at the relatively short pulse width and at the relatively long pulse width, the event classification to classify the at least one event associated with the DUT as a splitter. ### Claim 7 (depends on 1) The apparatus according to claim 1, wherein the power meter further comprises: a light power level analyzer, executed by the at least one hardware processor to: determine, based on an analysis of the light power level measurement, whether a light power level associated with the DUT is above a light power level threshold; and generate, based on a determination that the light power level associated with the DUT is above the light power level threshold, an indication of a high passive optical network (PON) signal. ### Claim 8 (depends on 7) The apparatus according to claim 7, wherein the event classifier is executed by the at least one hardware processor to generate, based on the analysis of the light power level measurement and the OTDR measurement at the relatively short pulse width and at the relatively long pulse width, the event classification to classify the at least one event associated with the DUT as a splitter. ### Claim 9 A method comprising: performing, by at least one hardware processor, at one end of a device under test (DUT) of a network, a light power level measurement; performing, by the at least one hardware processor, at the one end of the DUT, an optical time-domain reflectometer (OTDR) measurement at a relatively short pulse width and at a relatively long pulse width to detect at least one event associated with the DUT; and generating, by the at least one hardware processor, based on analysis of the light power level measurement and the OTDR measurement at the relatively short pulse width and at the relatively long pulse width, an event classification to classify the at least one event associated with the DUT. ### Claim 10 (depends on 9) The method according to claim 9, further comprising: determining, by the at least one hardware processor, based on an analysis of the light power level measurement, whether a light power level associated with the DUT is below a specified light power level; and based on a determination that the light power level associated with the DUT is below the specified light power level, generating, by the at least one hardware processor, an indication that there is no light on a passive optical network (PON) wavelength. ### Claim 11 (depends on 9) The method according to claim 9, wherein the DUT includes a section of a passive optical network (PON) between an optical network terminal (ONT) and a splitter. ### Claim 12 (depends on 9) The method of claim 9, wherein performing the OTDR measurement at the relatively short pulse width and at the relatively long pulse width to detect the at least one event associated with the DUT comprises: performing, by the at least one hardware processor, the OTDR measurement utilizing the relatively short pulse width to detect the at least one event associated with the DUT prior to performing, by the at least one hardware processor, the OTDR measurement utilizing the relatively long pulse width to detect the at least one event associated with the DUT. ### Claim 13 A non-transitory computer readable medium having stored thereon machine readable instructions that, when executed by at least one hardware processor, cause the at least one hardware processor to: perform, at one end of a device under test (DUT) of a network, a light power level measurement; perform, at the one end of the DUT, an OTDR measurement at a relatively short pulse width and at a relatively long pulse width to detect at least one event associated with the DUT; and generate, based on analysis of the light power level measurement and the OTDR measurement at the relatively short pulse width and at the relatively long pulse width, an event classification to classify the at least one event associated with the DUT. ### Claim 14 (depends on 13) The non-transitory computer readable medium according to claim 13, wherein the machine readable instructions to generate, based on the analysis of the light power level measurement and the OTDR measurement at the relatively short pulse width and at the relatively long pulse width, the event classification to classify the at least one event associated with the DUT as a splitter. ### Claim 15 (depends on 13) The non-transitory computer readable medium according to claim 13, wherein the DUT includes a section of a passive optical network (PON) between an optical network terminal (ONT) and a splitter. ### Claim 16 (depends on 13) The non-transitory computer readable medium according to claim 13, wherein, to perform the OTDR measurement at the relatively short pulse width and at the relatively long pulse width to detect the at least one event associated with the DUT, the machine readable instructions cause the at least one hardware processor to: perform the OTDR measurement utilizing the relatively short pulse width to detect the at least one event associated with the DUT prior to performing the OTDR measurement utilizing the relatively long pulse width to detect the at least one event associated with the DUT.