Systems and methods using a polarimeter to localize state of polarization transients on optical fibers

• US 9,774,392 B2
• Filed: 09/25/2015
• Issued: 09/26/2017
• Est. Priority Date: 07/17/2015
• Status: Active Grant

• Current Assignee: Ciena Corporation
• Original Assignee: Ciena Corporation
• Inventors: Doucet, David R., Charlton, Douglas, Bownass, David C., O'Sullivan, Maurice S., Wakefield, Joanne
• Primary Examiner(s): Vanderpuye, Ken N
• Assistant Examiner(s): Alagheband, Abbas H
• Application Number:
  US14/865,802
• Publication Number:
  US 20170019171A1
• Time in Patent Office: 732 Days
• Field of Search: 398 13, 398 65, 398151, 398184, 398205, 398209, 385 11, 356 731, 356367
• CPC Class Codes: G01J 4/00 Measuring polarisation of light
• CPC Class Codes: G01N 21/21 Polarisation-affecting properties G01N21/19 takes precedence
• CPC Class Codes: G01N 21/23 Bi-refringence
• CPC Class Codes: G02B 6/29311 Diffractive element operating in transmission
• CPC Class Codes: H04B 10/077 using a supervisory or additional signal
• CPC Class Codes: H04B 10/0771 Fault location on the transmission path

Abstract

Systems and methods using a polarimetric measurement device to localize a source of one or more State of Polarization (SOP) transients affecting one or more optical fibers are disclosed. The method includes transmitting a signal into a fiber in a first direction; receiving, at the polarimetric measurement device, the signal from one of the fiber and another fiber collocated in a bundle with the fiber in a second direction; and processing data from the polarimetric measurement device to determine a location of the one or more SOP transients. The processing can include detecting a presence of the one or more SOP transients based on a first signature and its echo seen in the data; and converting a time between the echoes into a distance.

Claims

1. A method using a polarimetric measurement device to localize a source of one or more State of Polarization (SOP) transients affecting one or more optical fibers, the method comprising:

subsequent to transmitting a signal into a first fiber, receiving, at the polarimetric measurement device, the signal from one of the first fiber and a second fiber, wherein, when the signal is received from the second fiber, the second fiber is substantially collocated with the first fiber, and wherein the signal is looped back at a loop back point into the one of the first fiber and the second fiber; and

processing data from the polarimetric measurement device to determine a location of the one or more SOP transients based on the signal experiencing the one or more SOP transients twice due to the loop back.

2. The method of claim 1, wherein the processing comprises:

detecting a presence of the one or more SOP transients based on signatures and its echo seen in the data; and

converting a time between the signatures and the echos into a distance.

3. The method of claim 1, wherein the location is determined as a distance from the loop back point.

4. The method of claim 1, wherein the receiving is from the first fiber, and wherein the signal is looped back with a circulator at a loop back point.

5. The method of claim 1, wherein the receiving is from the second fiber, and wherein the signal is looped back with a wavelength routing component at a loop back point.

6. The method of claim 1, wherein the signal is received from the first fiber at the loop back point, amplified at the loop back point, and transmitted back to the polarimetric measurement device.

7. The method of claim 1, wherein the polarimetric measurement device operates in a trigger mode to enable identification for sequestration of polarimetric measurement device measurement records containing transients.

8. The method of claim 1, wherein the location is determined with an accuracy directly related to a sample rate of the polarimetric measurement device.

9. The method of claim 1, further comprising:

intentionally causing an SOP transient to correlate fiber distance-based localization measurements to a physical position of the one or more optical fibers.

10. A system to localize a source of one or more State of Polarization (SOP) transients affecting one or more optical fibers, the system comprising:

a polarimetric measurement device configured to receive light from one of a first fiber and a second fiber, wherein, when the light is received from the second fiber, the second fiber is substantially collocated with the first fiber, and wherein the light is looped back at a loop back point into the one of the first fiber and the second fiber; and

a processor configured to process data from the polarimetric measurement device to determine a location of the one or more SOP transients based on the light experiencing the one or more SOP transients twice due to the loop back.

11. The system of claim 10, wherein the processor is configured to

detect a presence of the one or more SOP transients based on signatures and its echo seen in the data, and

convert a time between the signatures and the echo into a distance.

12. The system of claim 10, wherein the location is determined as a distance from the loop back point.

13. The system of claim 10, wherein the polarimetric measurement device receives the light from the first fiber, and wherein the light is looped back with a circulator at a loop back point.

14. The system of claim 10, wherein the polarimetric measurement device receives the light from the second fiber, and wherein the light is looped back with a wavelength routing component at a loop back point.

15. The system of claim 10, wherein the light is received at a loop back point, amplified at the loop back point, and transmitted back to the polarimetric measurement device.

16. The system of claim 10, wherein the polarimetric measurement device operates in a trigger mode to enable identification for sequestration of polarimetric measurement device measurement records containing transients.

17. The system of claim 10, wherein the location is determined with an accuracy directly related to a sample rate of the polarimetric measurement device.

18. The system of claim 10, wherein an SOP transient is intentionally caused to correlate fiber distance-based localization measurements to a physical position of the one or more optical fibers.

19. The system of claim 10, further comprising:

a source coupled to the fiber, wherein the source is configured to affect a rapid change of polarization of the light guided by the fiber.

20. A server configured to localize a source of one or more State of Polarization (SOP) transient affecting one or more optical fibers, the server comprising:

a processor; and

memory storing instructions that, when executed, cause the processor to

subsequent to transmission of a signal in a first direction and reception of the signal in a second direction by a polarimetric measurement device, receive data from the polarimetric measurement device associated with the signal, wherein the signal is looped back at a loop back point into the one or more optical fibers,

process the data to detect the one or more SOP transients, and

convert the data into a distance to localize the detected one or more SOP transients based on the signal experiencing the one or more SOP transients twice due to the loop back.