Optical fiber characterization measurement systems and methods

Patent metadata

Field	Value
Publication number	US-11201667-B2
Application number	US-201917056464-A
Country	US
Kind code	B2
Filing date	May 15, 2019
Priority date	May 22, 2018
Publication date	Dec 14, 2021
Grant date	Dec 14, 2021

Abstract

Systems and methods for characterizing an optical fiber performed in part by an optical node ( 12 ) in an optical line system ( 10 ) include performing one or more measurements to characterize the optical fiber ( 16, 18 ) with one or more components ( 50, 52 ) at the optical node ( 12 ), wherein the one or more components ( 50, 52 ) perform functions during operation of the optical node ( 12 ) and are reconfigured to perform the one or measurements independent of the functions; and configuring the optical node ( 12 ) for communication over the optical fiber ( 16, 18 ) based on the one or more measurements. The one or more components can include any of an Optical Service Channel (OSC), an Optical Time Domain Reflectometer (OTDR), and an optical amplifier. The configuring can include setting a launch power into the optical fiber based on the one or more measurements.

First claim

What is claimed is:

1. An optical node in an optical line system configured to characterize an optical fiber, the optical node comprising:
at least two lasers each configured to provide a different wavelength from one another to the optical fiber to a second optical node;
an optical amplifier connected to the optical fiber;
wherein each of the least two lasers and the optical amplifier are integrated components for performance of functionality in the optical line system, and wherein each is configurable to perform a measurement function on the optical fiber independent of the functionality in the optical line system, and
wherein the measurement function includes one or more of a fiber length measurement, a fiber dispersion measurement, and a Stimulated Raman Scattering (SRS) measurement; and
one or more optical modems that are configured for communication over the optical fiber based on the measurement function.

2. The optical node of claim 1 , wherein a launch power of the one or more optical modems into the optical fiber is set based on results from the measurement function.

3. The optical node of claim 1 , further comprising
one or more receivers each configured to receive a corresponding different wavelength from the second optical node via a second optical fiber, wherein the one or more receivers are integrated components for performance of functionality in the optical line system, and wherein the one or more receivers are configurable to perform the measurement function on the second optical fiber independent of the functionality in the optical line system.

4. The optical node of claim 1 , wherein the measurement function is the fiber length measurement, wherein a laser of the at least two lasers is configured for an Optical Time Domain Reflectometer (OTDR), and wherein the fiber length measurement is based on an OTDR measurement with a clear reference point at the second optical node.

5. The optical node of claim 4 , wherein the clear reference point is provided for a configurable referent element at the second optical node that is configured to cause the clear reference point on an OTDR trace.

6. The optical node of claim 1 , wherein the measurement function is the fiber dispersion measurement, and wherein the fiber dispersion measurement is performed by the at least two lasers each configured to provide the different wavelength with a same bit pattern in a synchronized manner or with known delays.

7. The optical node of claim 6 , wherein the fiber dispersion measurement is measured by a determining a differential time delay between optical pulses on each of the different wavelengths and dividing the differential time delay by a length of the optical fiber and separation of the different wavelengths to determine the dispersion at an average of the different wavelengths.

8. The optical node of claim 1 , wherein the measurement function is the SRS measurement that is based on two measurements including one with the optical amplifier disabled and one with the optical amplifier configured to generate Amplified Stimulated Emission (ASE).

9. The optical node of claim 8 , wherein the SRS measurement is utilized to determine launch powers of optical signals independent of knowledge of a fiber type and patch panel losses.

10. A method comprising:
configuring an optical node in an optical line system to perform a measurement function, wherein the optical node includes at least two lasers each configured to provide a different wavelength from one another to the optical fiber to a second optical node and an optical amplifier connected to the optical fiber;
performing the measurement function that includes one or more of a fiber length measurement, a fiber dispersion measurement, and a Stimulated Raman Scattering (SRS) measurement; and
configuring the optical node to perform functionality in the optical line system that is independent of the measurement function including configuration one or more optical modems for communication over the optical fiber based on the measurement function.

11. The method of claim 10 , wherein a launch power of the one or more modems into the optical fiber is set based on results from the measurement function.

12. The method of claim 10 , further comprising
configuring one or more to receive a corresponding different wavelength from the second optical node via a second optical fiber, wherein the one or more receivers are integrated components for performance of functionality in the optical line system, and wherein the one or more receivers are configurable to perform the measurement function on the second optical fiber independent of the functionality in the optical line system.

13. The method of claim 10 , wherein the measurement function is the fiber length measurement, wherein a laser of the at least two lasers is configured for an Optical Time Domain Reflectometer (OTDR), and wherein the fiber length measurement is based on an OTDR measurement with a clear reference point at the second optical node.

14. The method of claim 13 , wherein the clear reference point is provided for a configurable referent element at the second optical node that is configured to cause the clear reference point on an OTDR trace.

15. The method of claim 10 , wherein the measurement function is the fiber dispersion measurement, and wherein the fiber dispersion measurement is performed by the at least two lasers each configured to provide the different wavelength with a same bit pattern in a synchronized manner or with known delays.

16. The method of claim 15 , wherein the fiber dispersion measurement is measured by a determining a differential time delay between optical pulses on each of the different wavelengths and dividing the differential time delay by a length of the optical fiber and separation of the different wavelengths to determine the dispersion at an average of the different wavelengths.

17. The method of claim 10 , wherein the measurement function is the SRS measurement that is based on two measurements including one with the optical amplifier disabled and one with the optical amplifier configured to generate Amplified Stimulated Emission (ASE).

18. The method of claim 17 , further comprising
utilizing the SRS measurement to determine launch powers of optical signals independent of knowledge of a fiber type and patch panel losses.

19. An optical node in an optical line system configured to characterize an optical fiber, the optical node comprising:
at least two lasers each configured to provide a different wavelength from one another to the optical fiber to a second optical node;
an optical amplifier connected to the optical fiber;
wherein each of the least two lasers and the optical amplifier are integrated components for performance of functionality in the optical line system, and wherein each is configurable to perform a measurement function on the optical fiber independent of the functionality in the optical line system,
wherein the measurement function includes two or more of a fiber length measurement, a fiber dispersion measurement, and a Stimulated Raman Scattering (SRS) measurement,
wherein the fiber dispersion measurement is performed by the at least two lasers each configured to provide the different wavelength with a same bit pattern in a synchronized manner or with known delays, and
wherein the SRS measurement that is based on two measurements including one with the optical amplifier disabled and one with the optical amplifier configured to generate Amplified Stimulated Emission (ASE).

Assignees

• Ciena Corp

Inventors

• Archambault Jean-Luc
• Cao Song
• Kim Na Young

Classifications

• G01M11/39

  in which light is projected from both sides of the fiber or waveguide end-face · CPC title

• G01M11/3163

  by measuring dispersion · CPC title

• H04B10/071 Primary

  using a reflected signal, e.g. using optical time domain reflectometers [OTDR] · CPC title

• H04B10/07951

  Monitoring or measuring chromatic dispersion or PMD · CPC title

• H04B10/077

  using a supervisory or additional signal · CPC title