# US 2019/0319701 A1 · Techniques for Parameter Reporting of Elements in an Optical Transmission System Using High Loss Loopback (HLLB) Data and a Line Monitoring System Implementing the Same

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- Number: US 2019/0319701 A1
- Document ID: US20190319701A1
- Status: Published application
- Kind: A1
- Application number: 16/452,817
- Filed: 2019-06-26
- Published: 2019-10-17
- Earliest claimed: 2018-01-12
- Assignees: Subcom, LLC
- Applicants: SubCom, LLC
- Inventors: Lee Richardson; Georg Heinrich Mohs; Yunlu Xu; Richard Kram; Lara Denise Garrett; Jonathan M. Liss; Dmitriy Kovsh
- Web page: https://patentgrep.com/patent/US20190319701A1

## CPC

- H04B 10/035: using loopbacks
- H04B 10/071: using a reflected signal, e.g. using optical time domain reflectometers [OTDR]
- H04B 10/0777: {Monitoring line amplifier or line repeater equipment}
- H04B 10/29: Repeaters
- H04B: TRANSMISSION

## Abstract

A system and method consistent with the present disclosure provides for automated line monitoring system (LMS) baselining that enables capturing and updating of operational parameters specific to each repeater and associated undersea elements based on high loss loopback (HLLB) data. The captured operational parameters may then be utilized to satisfy queries targeting specific undersea elements in a Command-Response (CR) fashion. Therefore, command-response functionality may be achieved without the added cost, complexity and lifespan issues related to deploying undersea elements with on-board CR circuitry. As generally referred to herein, operational parameters include any parameter that may be derived directly or indirectly from HLLB data. Some example non-limiting examples of operational parameters include span gain loss, input power, output power, gain, and gain tilt.

## Claims

### Claim 1

A line monitoring equipment (LME) comprising:
at least one controller operable to execute stored instructions, that when executed, cause the at least one controller to:
transmit one or more LME test signals on an optical transmission path;
receive LME loopback data in response to the transmitted one or more LME test signals, wherein the LME loopback data comprises a peak corresponding to a location of each high loss loopback (HLLB) path in the optical transmission path; and
generate a plurality of operational parameters based on the LME loopback data, wherein each operational parameter corresponds to a repeater coupled to the optical transmission path and are stored in a table in a memory, the table associating each repeater with the corresponding operational parameter.

### Claim 2 (depends on 1)

The LME of claim 1, wherein the at least one controller is further caused to send a reporting message to a remote computer, the reporting message including a representation of one or more operational parameters of the plurality of operational parameters associated with each of the selected repeaters.

### Claim 3 (depends on 1)

The LME of claim 1, wherein the plurality of operational parameters includes one or more of the following: (i) an output power value, (ii) a gain value, and (iii) amplifier accumulated gain tilt value.

### Claim 4 (depends on 2)

The LME of claim 2, wherein the reporting message is sent in response to the at least one controller receiving a Command-Response (CR) message from a user.

### Claim 5 (depends on 4)

The LME of claim 4, wherein the CR message includes at least one repeater identifier.

### Claim 6 (depends on 1)

The LME of claim 1, wherein the at least one controller is further caused to:
store the LME loopback data as a current baseline loopback data in the memory;
receive additional LME loopback data in response to one or more additional LME test signals transmitted on the optical transmission path;
compare the additional LME loopback data to the current baseline loopback data to identify any change in the plurality of operational parameters; and
update one or more operational parameters of the plurality of operational parameters based on the identified change.

### Claim 7 (depends on 6)

The LME of claim 6, wherein the updated one or more operational parameters is updated based on an output of an amplifier model.

### Claim 8 (depends on 6)

The LME of claim 6, wherein the at least one controller is further caused to send an alert message to a user based on the updated one or more operational parameters exceeding a predefined threshold.

### Claim 9 (depends on 6)

The LME of claim 6, further comprising an automatic signature analysis (ASA) processor, wherein the ASA processor is configured to:
perform analysis on the LME loopback data; and
perform the identification of any change in the plurality of operational parameters based at least in part on the performed analysis on the LME loopback data.

### Claim 10 (depends on 1)

The LME of claim 1, wherein the one or more LME test signals comprise a plurality of channel wavelengths, the plurality of channel wavelengths including (i) a low value corresponding to a minimum channel wavelength of a bandwidth associated with the optical transmission path and (ii) a high value corresponding with a maximum channel wavelength of the bandwidth associated with the optical transmission path.

### Claim 11

A method comprising:
transmitting, via at least one controller, one or more LME test signals on an optical transmission path;
receiving, via the at least one controller, LME loopback data in response to the transmitted one or more LME test signals, wherein the LME loopback data comprises a peak corresponding to a location of each high loss loopback (HLLB) path in the optical transmission path; and
generating, via the at least one controller, a plurality of operational parameters based on the LME loopback data, wherein each operational parameter corresponds to a repeater coupled to the optical transmission path and are stored in a table in a memory, the table associating each repeater with the corresponding operational parameter.

### Claim 12 (depends on 11)

The method of claim 11, further comprising sending, via the at least one controller, a reporting message to a remote computer, the reporting message including a representation of one or more operational parameters of the plurality of operational parameters associated with each of the selected repeaters.

### Claim 13 (depends on 11)

The method of claim 11, wherein the plurality of operational parameters includes one or more of the following: (i) an output power value, (ii) a gain value, and (iii) amplifier accumulated gain tilt value.

### Claim 14 (depends on 12)

The method of claim 12, wherein the reporting message is sent in response to the at least one controller receiving a Command-Response (CR) message from a user.

### Claim 15 (depends on 14)

The method of claim 14, wherein the CR message includes at least one repeater identifier.

### Claim 16 (depends on 15)

The method of claim 15, further comprising:
storing, via the at least one controller, the LME loopback data as a current baseline loopback data in the memory;
receiving, via the at least one controller, additional LME loopback data in response to one or more additional LME test signals transmitted on the optical transmission path;
comparing, via the at least one controller, the additional LME loopback data to the current baseline loopback data to identify any change in the plurality of operational parameters; and
updating, via the at least one controller, one or more operational parameters of the plurality of operational parameters based on the identified change.

### Claim 17 (depends on 16)

The method of claim 16, wherein the updated one or more operational parameters is updated based on an output of an amplifier model.

### Claim 18 (depends on 16)

The method of claim 16, further comprising sending, via the at least one controller, an alert message to a user based on the updated one or more operational parameters exceeding a predefined threshold.

### Claim 19 (depends on 16)

The method of claim 16, further comprising:
performing, via an automatic signature analysis (ASA) processor, analysis on the LME loopback data; and
performing, via the ASA processor, the identification of any change in the plurality of operational parameters based at least in part on the performed analysis on the LME loopback data.

### Claim 20 (depends on 11)

The method of claim 11, wherein the one or more LME test signals comprise a plurality of channel wavelengths, the plurality of channel wavelengths including (i) a low value corresponding to a minimum channel wavelength of a bandwidth associated with the optical transmission path and (ii) a high value corresponding with a maximum channel wavelength of the bandwidth associated with the optical transmission path.