Lifetime extending and performance improvements of optical fibers via loading

Patent metadata

Field	Value
Publication number	US-9971230-B2
Application number	US-201715683281-A
Country	US
Kind code	B2
Filing date	Aug 22, 2017
Priority date	Jul 11, 2008
Publication date	May 15, 2018
Grant date	May 15, 2018

Abstract

A method of making a microstructured optical fiber comprising loading the core and cladding materials of the fiber with hydrogen and deuterium at a loading temperature; annealing the fiber at a selected temperature T anneal ; pumping the fiber with radiation; and reducing the temperature of the fiber and storing the fiber at the reduced temperature before the step of pumping the fiber; and wherein the method allows the hydrogen and the deuterium to become bound to the core material and the cladding material.

First claim

What is claimed is:

1. A method of producing a microstructured optical fiber comprising a core and a cladding comprising a core material and a cladding material, respectively, the method comprising:
providing a preform comprising the core material surrounded by the cladding material, wherein at least a part of the core material is silica or doped silica;
loading the core material and/or the cladding material with hydrogen and/or deuterium;
forming the microstructured optical fiber from the preform;
applying a coating to the formed fiber; and
wherein the loading with hydrogen and/or deuterium is performed prior to or during the process of forming the fiber and prior to the application of the coating.

2. The method of claim 1 , wherein the loading with hydrogen and/or deuterium includes loading at a temperature T, wherein T is equal to or higher than 400° C.

3. The method of claim 1 , wherein the loading with hydrogen and/or deuterium includes loading at a temperature T, wherein T is equal to or higher than 500° C.

4. The method of claim 1 , wherein the core material has a Germanium content of less than or equal 20 at %.

5. The method of claim 1 , wherein the core material is undoped.

6. The method of claim 1 , wherein the method comprises subjecting the microstructured optical fiber is to energy stimulation prior to the application of the coating.

7. The method of claim 1 , wherein the method comprises subjecting at least the core material to energy stimulation after the loading with hydrogen and/or deuterium.

8. The method of claim 7 , wherein the energy stimulation comprises contribution of energy to binding at least a part of the loaded hydrogen and/or deuterium to the core material and/or the cladding material.

9. The method of claim 7 , wherein the energy stimulation is performed at least partly during the process of forming the fiber.

10. The method of claim 7 , wherein the energy stimulation is performed prior to the application of the coating.

11. The method of claim 7 , wherein the energy stimulation comprises annealing the fiber prior to the application of the coating.

12. The method of claim 7 , wherein the energy stimulation comprises irradiating the fiber.

13. The method of claim 7 , wherein the energy stimulation comprises irradiating the fiber prior to the application of the coating.

14. The method of claim 7 , wherein the energy stimulation comprises applying irradiation transversely to the optical axis of the fiber.

15. The method of claim 1 , wherein the forming of the microstructured optical fiber comprises drawing the fiber from the preform at a temperature of at least 1000° C.

16. A method of producing a supercontinuum light source, the method comprising:
providing a feeding unit comprising a pump light source;
providing a microstructured optical fiber;
arranging said feeding unit in optical communication with said microstructured optical fiber so as feed said microstructured optical fiber with pump pulses; and
wherein said microstructured optical fiber has been produced according to the method of claim 1 .

17. The method of claim 16 , wherein the microstructured optical fiber has a length of at least 10 cm and comprises a pattern of holes extending lengthwise in the fiber.

18. The method of claim 16 , wherein the pump light source comprises a mode locked fiber laser.

19. The method of claim 16 including the step of splicing seed feeding unit to said microstructured optical fiber.

20. The method of claim 16 wherein at least one fiber end of the microstructured optical fiber has been annealed prior to being spliced to said feeding system.

Assignees

• Nkt Photonics As

Inventors

• Thomsen Carsten L

Classifications

• H01S3/302

  in an optical fibre · CPC title

• G02B6/02333

  Core having higher refractive index than cladding, e.g. solid core, effective index guiding · CPC title

• G02B6/02342

  characterised by cladding features, i.e. light confining region · CPC title

• G02F1/365 Primary

  in an optical waveguide structure (G02F1/377, {G02F1/395} take precedence) · CPC title

• G02B6/4296

  coupling with sources of high radiant energy, e.g. high power lasers, high temperature light sources · CPC title