Polarization maintaining optical fiber

Patent metadata

Field	Value
Publication number	US-10838140-B2
Application number	US-201615071505-A
Country	US
Kind code	B2
Filing date	Mar 16, 2016
Priority date	Mar 20, 2015
Publication date	Nov 17, 2020
Grant date	Nov 17, 2020

Abstract

An optical fiber, comprising: (i) a core, (ii) a cladding surrounding the core, (iii) at least one stress member adjacent the fiber core and situated within the cladding, said stress member comprising silica doped with F.

First claim

What is claimed is:

1. A polarization maintaining optical fiber comprising:
(i) a core;
(ii) a cladding surrounding the core; and
(iii) at least one stress member adjacent the core and situated within the cladding, all of said at least one stress members comprising fluorine (F) doped silica with no boron (B); such that all of the at least one stress members have a CTE of 2×10 −7 /° C. to 5×10 −7 /° C. within temperatures of −100° C. to 600° C.

2. The polarization maintaining optical fiber of claim 1 , wherein the core is silica based and is surrounded by at least one stress member, said at least one stress member being an annular region of F doped silica.

3. The polarization maintaining optical fiber of claim 1 , wherein said at least one stress member includes at least two stress rods situated on opposite sides of said core.

4. The polarization maintaining optical fiber of claim 1 comprising an attenuation of less than 2 dB/km at an operating wavelength between 800 nm and 1600 nm.

5. The polarization maintaining optical fiber of claim 1 comprising an attenuation of less than 0.5 dB/km at an operating wavelength between 800 nm and 1600 nm.

6. The polarization maintaining optical fiber of claim 1 , said fiber being a single mode polarization maintaining fiber and comprising a birefringence of 0.4×10 −4 to 10×10 −4 at a wavelength λ situated between 450 nm and 1600 nm.

7. The polarization maintaining optical fiber of claim 1 , wherein said at least one stress member has 1.5 wt %<F<3.5 wt %.

8. The polarization maintaining optical fiber of claim 3 , wherein said at least two stress rods have a cross-section with an average diameter d av , wherein 10 μm≤d av ≤40 μm.

9. The polarization maintaining optical fiber of claim 1 , said fiber being a single mode polarization maintaining fiber, wherein said at least one stress member comprises two F doped silica rods with 1.5 wt %<F<3.5 wt % and 0 wt % of B.

10. The polarization maintaining optical fiber of claim 1 , said fiber being a single mode polarization fiber, wherein said at least one stress member comprises two F doped silica rods with no B.

11. The polarization maintaining optical fiber of claim 1 , wherein said at least one stress member has a thermal stress coefficient σ t and a mechanical stress coefficient σ m , and wherein σ t <0.05σ m .

12. The polarization maintaining optical fiber of claim 1 , wherein the optical fiber has a change in beat length L b of less than 10%.

13. The polarization maintaining optical fiber of claim 1 , wherein the cladding has a CTE, and a differential-CTE, Δα, between the CTE of all of the at least one stress members and the CTE of the cladding is sufficiently small that a thermal-stress contribution, σ t , to birefringence, Bi, of the optical fiber is smaller than a mechanical-stress contribution, σ m , to Bi, Bi being expressed as Bi=C(σ t −σ m ), wherein C is the stress-optical coefficient.

14. The polarization maintaining optical fiber of claim 13 , wherein σ t <0.10σ m .

15. The polarization maintaining optical fiber of claim 1 , wherein the cladding has a composition of substantially pure silica.

16. A polarization maintaining optical fiber comprising:
(i) a core;
(ii) a cladding surrounding the core; and
(iii) at least one stress member adjacent the core and situated within the cladding, all of said at least one stress members comprising silica doped with fluorine (F) and no boron (B), wherein all of said at least one stress members have a thermal stress coefficient σ t and a mechanical stress coefficient σ m , and wherein σ t <0.1σ m , and a CTE of all of said at least one stress members is 2×10 −7 /° C. and 5×10 −7 /° C. within temperatures of −100° C. to 600° C.

17. The polarization maintaining optical fiber of claim 16 , wherein the core is silica based and the at least one stress member comprises 1 wt % to 4 wt % F.

18. The polarization maintaining optical fiber of claim 16 , wherein the core is silica based and the at least one stress member either: (i) includes at least two stress rods situated on opposite sides of said core; or (ii) surrounds said core.

19. The polarization maintaining optical fiber of claim 16 , wherein said core is silica based; and the stress member includes at least two stress rods situated on opposite sides of said core, and said stress rods comprise 1 wt %<F<4 wt %.

Assignees

• Corning Inc

Inventors

• Li Ming-Jun
• Stone Jeffery Scott

Classifications

• G02B6/024 Primary

  with polarisation maintaining properties · CPC title

• C03B2201/08

  doped with boron or fluorine or other refractive index decreasing dopant · CPC title

• C03B2201/06

  Doped silica-based glasses · CPC title