# US 8,570,501 B2 · Fiber identification using mode field diameter profile

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- Number: US 8,570,501 B2
- Document ID: US8570501B2
- Status: Granted
- Kind: B2
- Application number: 12/640,512
- Filed: 2009-12-17
- Published: 2011-06-23
- Granted: 2013-10-29
- Earliest claimed: 2009-12-17
- Assignees: AT&T Intellectual Property I, L.P.
- Applicants: Jonathan Nagel; Sheryl Woodward
- Inventors: Jonathan Nagel; Sheryl Woodward
- Web page: https://patentgrep.com/patent/US8570501B2

## CPC

- G01M 11/3145: {Details of the optoelectronics or data analysis}
- G01M 11/3136: {for testing of multiple fibers}
- H04B 10/071: using a reflected signal, e.g. using optical time domain reflectometers [OTDR]
- G01M: TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- H04B: TRANSMISSION

## Abstract

Described herein are systems and methods for uniquely identifying, or “fingerprinting,” optical fibers based upon measurements from an optical time-domain reflectometer (“OTDR”). One embodiment of the disclosure of this application is related to a computer readable storage medium including a set of instructions that are executable by a processor. The set of instructions being operable to retrieve a profile for an intended fiber, the profile including unique measurement data of the intended fiber, collect further measurement data from a connected fiber within a network, compare the unique measurement data of the intended fiber to the further measurement data of the connected fiber, and confirm an identity of the connected fiber as being the intended fiber when the unique measurement data matches the further measurement data, and trigger an alert when the unique measurement data does not match the further measurement data.

## Claims

### Claim 1

A tangible computer readable storage medium including a set of instructions that are executable by a processor, the set of instructions, when executed by the processor, causing the processor to perform operations comprising:
retrieving a profile for an intended fiber, the profile including unique measurement data of the intended fiber;
collecting further measurement data from a connected fiber within a network;
comparing the unique measurement data of the intended fiber to the further measurement data of the connected fiber; and
confirming an identity of the connected fiber as being the intended fiber when the unique measurement data matches the further measurement data, and triggering an alert when the unique measurement data does not match the further measurement data.

### Claim 2 (depends on 1)

The tangible computer readable storage medium according to claim 1, wherein the operations further comprise:
performing initial measurements of a plurality of fibers in the network, the plurality of fibers including the intended fiber;
creating a plurality of profiles for each of the plurality of fibers, each of the profiles including unique measurement data for each of the fibers; and
storing the plurality of profiles.

### Claim 3 (depends on 1)

The tangible computer readable storage medium according to claim 1, wherein the unique measurement data includes a relative backscatter reading of the intended fiber and the further measurement includes a relative backscatter reading of the connected fiber.

### Claim 4 (depends on 1)

The tangible computer readable storage medium according to claim 1, wherein the collecting of the further measurement data is performed by an optical time-domain reflectometer.

### Claim 5 (depends on 1)

The tangible computer readable storage medium according to claim 1, wherein the collecting of the further measurement data includes bi-directional traces along the length of the connected fiber.

### Claim 6 (depends on 1)

The tangible computer readable storage medium according to claim 1, wherein the comparing the unique measurement data of the intended fiber to the further measurement data of the connected fiber is performed by a processing unit.

### Claim 7 (depends on 1)

The tangible computer readable storage medium according to claim 1, wherein the confirming the identity of the connected fiber as being the intended fiber is performed by an optical transceiver.

### Claim 8 (depends on 7)

The tangible computer readable storage medium according to claim 7, wherein an optical time-domain reflectometer is integrated into the optical transceiver.

### Claim 9 (depends on 1)

The tangible computer readable storage medium according to claim 1, wherein the alert is one of an audible tone, a visual indication, and a notification to a user.

### Claim 10 (depends on 1)

The tangible computer readable storage medium according to claim 1, wherein the alert is sent electronically to a network controller.

### Claim 11

A system, comprising:
a memory storing profiles of a plurality of fibers within a network, each profile including unique measurement data pertaining to one of the plurality of fibers;
a detector collecting further measurement data from a connected fiber; and
a comparator comparing the further measurement data to the unique measurement data of the profiles, the comparator confirming an identity of the connected fiber as one of the plurality of fiber when the further measurement data match unique measurement data of one of the profiles, and the comparator triggering an alert when the further measurement data does not match unique measurement data of any of the profiles.

### Claim 12 (depends on 11)

The system according to claim 11, further comprising:
a processing unit for performing initial measurements of a plurality of fibers in the network, the plurality of fibers including the intended fiber, creating a plurality of profiles for each of the plurality of fibers, each of the profiles including unique measurement data for each of the fibers, and storing the plurality of profiles in the memory.

### Claim 13 (depends on 11)

The system according to claim 11, wherein the unique measurement data includes a relative backscatter reading of the intended fiber and the further measurement includes a relative backscatter reading of the connected fiber.

### Claim 14 (depends on 11)

The system according to claim 11, wherein the detectors reside within an optical time-domain reflectometer and the collecting of the further measurement data is performed by the optical time-domain reflectometer.

### Claim 15 (depends on 11)

The system according to claim 11, wherein the collecting of the further measurement data includes bi-directional traces along the length of the connected fiber.

### Claim 16 (depends on 11)

The system according to claim 11, wherein the comparator is a processing unit.

### Claim 17 (depends on 11)

The system according to claim 11, wherein the confirming the identity of the connected fiber as being the intended fiber is performed by an optical transceiver.

### Claim 18 (depends on 17)

The system according to claim 17, wherein an optical time-domain reflectometer is integrated into the optical transceiver.

### Claim 19 (depends on 11)

The system according to claim 11, wherein the alert is one of an audible tone, a visual indication, and a notification to a user.

### Claim 20 (depends on 11)

The system according to claim 11, wherein the alert is sent electronically to a network controller.