Claims
- 1. A tellurite glass as a glass material for an optical fiber or an optical waveguide, comprising:
0<Bi2O3≦20 (mole %); 0≦Na2O≦35 (mole %); 0≦ZnO≦35 (mole %); and 55<TeO2<90 (mole %).
- 2. A tellurite glass as a glass material for an optical fiber or an optical waveguide, comprising:
1.5<Bi2O3≦15 (mole %); 0≦Na2O≦35 (mole %); 0≦ZnO≦35 (mole %); and 55≦TeO2≦90 (mole %).
- 3. A tellurite glass as a glass material for an optical fiber or an optical waveguide, comprising:
0<Bi2O3≦20 (mole %); 0≦Li2O≦25 (mole %); 0≦ZnO≦25 (mole %); and 55≦TeO2≦90 (mole %).
- 4. A tellurite glass as a glass material for an optical fiber or an optical waveguide, comprising:
0<Bi2O3≦20 (mole %); 0≦M2O≦35 (mole %); 0≦ZnO≦35 (mole %); and 55≦TeO2≦90 (mole %), wherein the M is at least two univalent metals selected from a group of Na, Li, K, Rb, and Cs.
- 5. A tellurite glass as a glass material for an optical fiber or an optical waveguide, comprising:
1.5<Bi2O3≦15 (mole %); 0≦M2O≦35 (mole %); 0≦ZnO≦35 (mole %); and 55≦TeO2≦90 (mole %), wherein the M is at least two univalent metals selected from a group of Na, Li, K, Rb, and Cs.
- 6. A tellurite glass as a glass material for an optical fiber or an optical waveguide, comprising:
0<Bi2O3≦20 (mole %); 0≦Li2O3≦25 (mole %); 0≦Na2O≦15 (mole %); 0≦ZnO≦25 (mole %); and 60≦TeO2≦90 (mole %).
- 7. A tellurite glass as a glass material for an optical fiber or an optical waveguide that contains erbium at least in a core, consisting of a glass composition that contains Al2O3.
- 8. A tellurite glass as a glass material for an optical fiber or an optical waveguide, wherein
the glass material has a composition of: TeO2—ZnO—M2O—Bi2O3—Al2O3 where M is at least one alkali element.
- 9. A tellurite glass as a glass material for an optical fiber or an optical waveguide, comprising:
0<Bi2O3≦10 (mole %) 0≦Li2O3≦30 (mole %); 0≦ZnO≦4 (mole%) 70≦TeO2≦90 (mole %); and 0≦Al2O3≦3 (mole %).
- 10. A tellurite glass as a glass material for an optical fiber or an optical waveguide, comprising:
0<Bi2O3≦15 (mole %); 0≦Na2O≦30 (mole %); 0≦ZnO≦35 (mole %); 60≦Ti2O2≦90 (mole %); and 0≦Al2O3≦4 (mole %).
- 11. A tellurite glass as claimed in any one of claims 1 to 10, wherein
a concentration of the Bi2O3 is: 4<Bi2O3<7.
- 12. An optical amplification medium comprised of an optical amplifier or an optical waveguide having a core glass and a clad glass, wherein
at least one of the core glass and the clad glass is made of the tellurite glass of any one of claims 1 to 6 or 8 to 11.
- 13. An optical amplification medium comprised of an optical amplifier or an optical waveguide having a core glass and a clad glass, wherein
the core glass is made of a tellurite glass having a composition of: 0<Bi2O3≦20 (mole %), preferably 1.5<Bi2O3≦15 (mole %), or more preferably 4<Bi2O3≦7; 0≦Na2O≦35 (mole %); 0≦ZnO ≦35 (mole %); and 55≦TeO2≦90 (mole %), and the clad is made of a tellurite glass having a composition selected from a group of: a first composition including 5<Na2O<35 (mole %), 0≦ZnO<10 mole %), and 55<TeO2<85 (mole %); a second composition including 5<Na2O<35 (mole %), 10<ZnO≦20 mole %), and 55<TeO2<85 (mole %); and a third composition including 0≦Na2O<25 (mole %), 20<ZnO≦30 mole %), and 55<TeO2<75 (mole %).
- 14. An optical amplification medium as claimed in claim 12 or claim 13, wherein
at least one of the core glass and the clad glass contains erbium or erbium and ytterbium.
- 15. An optical amplification medium as claimed in any one of claims 12 to 14, wherein
at least one of the core glass and the clad glass contains at least one selected from a group consisting of boron (B), phosphorus (P), and hydroxyl group.
- 16. An optical amplification medium as claimed in any one of claims 12 to 15, wherein
at least one of the core glass and the clad glass includes an element selected from a group consisting of Ce, Pr, Nd, Sm, Tb, Gd, Eu, Dy, Ho, Tm, and Yb.
- 17. An optical amplification medium comprised of an optical amplifier or an optical waveguide having a core and a clad which are made of a glass material and at least the core contains erbium, wherein the glass material consists of a tellurite composition that contains Al2O3.
- 18. An optical amplification medium comprised of an optical amplifier or an optical waveguide having a core and a clad which are made of a glass material and at least the core contains erbium, wherein
the glass material consists of a tellurite composition of: TeO2—ZnO—M2O—Bi2O3—Al2O3 where M is at least one alkali element.
- 19. An optical amplification medium as claimed in any one of claims 12 to 18, wherein
a cut-off wavelength is in the range of 0.4 μm to 2.5 μm.
- 20. A laser device comprising an optical cavity and an excitation light source, wherein
at least one of optical amplification media in the optical cavity is the optical amplification medium of any one of claims 12 to 19.
- 21. A laser device having a plurality of optical amplification media comprised of optical fibers that contain erbium in their cores and arranged in series, wherein
each of the optical amplification media is the optical amplification medium of any one of claims 12 to 19.
- 22. A laser device having an amplification medium and an excitation light source, wherein the amplification medium is the optical amplification medium of any one of claims 12 to 19.
- 23. An optical amplifier having an optical amplification medium, an input device that inputs an excitation light and a signal light for pumping the optical amplification medium, wherein
the optical amplification medium is the optical amplification medium of any one of claims 12 to 19.
- 24. An optical amplifier having a plurality of optical amplification media comprised of optical fibers that contain erbium in their cores and arranged in series, wherein
each of the optical amplification media is the optical amplification medium of any one of claims 12 to 19.
- 25. An optical amplifier having a tellurite glass as an optical amplification medium, comprising:
a dispersion medium which is placed on at least one position in the front of or at the back of the optical amplification medium, wherein the dispersion medium compensates for dispersion of wavelengths by a value of chromatic dispersion that takes a plus or negative number opposite to a value of chromatic dispersion for the optical amplification medium.
- 26. An optical amplifier as claimed in claim 25, wherein
the optical amplification medium is an optical waveguide made of a tellurite glass that contains a rare-earth element or a transition metal element.
- 27. An optical amplifier as claimed in claim 25 or 26, wherein
the tellurite glass consists of a composition selected from: TeO2—ZnO—M2O—Bi2O3; TeO2—ZnO—M2O—Bi2O3—Al2O3, and TeO2—WO3—La2O3—Bi2O3—Al2O3 where M is at least one alkali element.
- 28. An optical amplifier as claimed in any one of claims 25 to 27, wherein
the dispersion medium is one selected from an optical fiber and a fiber-bragg-grating.
- 29. An optical amplifier having a plurality of stages of optical amplification portions that include erbium-doped optical fibers as their optical amplification media, wherein
a tellurite glass optical fiber is used as a material of the optical fiber in at least one of the optical amplification portions except one at the front thereof, and an optical amplification portion positioned in front of the optical amplification portion using the tellurite glass optical fiber is comprised of an erbium-doped optical fiber, where a product of an erbium-doping concentration and a fiber-length of the erbium-doped optical fiber is smaller than that of the tellurite glass fiber.
- 30. An optical amplifier as claimed in claim 29, wherein
the tellurite glass consists of a composition selected from: TeO2-ZnO-M2O-Bi2O3; and TeO2-ZnO-M2O-Bi203-Al2O3, where M is at least one alkali element.
- 31. An optical amplifier as claimed in claim 29 or 30, wherein
a material of the optical amplification medium is one selected from a group of a silica optical fiber, a fluoro-phosphate optical fiber, a phosphate optical fiber, and a chalcogenide optical fiber, in addition to the tellurite optical fiber.
- 32. An optical amplifier as claimed in any one of claims 29 to 31, wherein
an optical fiber material except a tellurite optical fiber is used as at least one optical amplification portion at any given stage up to the optical amplification portion using the tellurite glass fiber.
- 33. An optical amplifier as claimed in claim 29 or 30, wherein
a product of an erbium-addition concentration and a fiber-length of at least one optical fiber, which is positioned at any given stage up to the optical amplification portion using the tellurite glass fiber, is smaller than that of the tellurite optical fiber.
- 34. An optical amplifier using erbium-doped optical fibers as optical amplification media, comprising at least one arrangement configuration wherein
at least two tellurite optical fibers each having a different product of an erbium-doping concentration and a fiber-length are arranged in series so that the tellurite optical fiber having a smaller product of an erbium-addition concentration and a fiber-length is placed at the front stage up to the tellurite optical fiber having a larger product of an erbium-addition concentration and a fiber-length.
- 35. An optical amplifier as claimed in claim 33, wherein
the tellurite glass consists of a composition selected from: TeO2—ZnO—M2O—Bi2O3; and TeO2—ZnO—M2O—Bi2O3—Al2O3, where M is at least one alkali element.
- 36. An optical-fiber splicing structure for contacting a splicing end surface of a first housing in which an end of a first optical fiber is held and an splicing end surface of a second housing in which an end of a second optical fiber is held in a state of co-axially centering an optical axis of the first optical fiber and an optical axis of the second optical fiber, where at least one of the first optical fiber and the second optical fiber is a non-silica-based optical fiber, wherein
optical axes of the first and second optical fibers are held in the first and second housings respectively at angles θ1 and θ2 (θ1≈θ2) from a vertical axis of a boundary surface between the splicing end surfaces, and a relationship between the angles θ1 and θ2 satisfies Snell's law represented by an equation (4) at the time of splicing the first and second optical fibers: 7sin θ1sin θ2=n2n1(4)where n1 is a refractive index of the first optical fiber and n2 is a refractive index of the second optical fiber.
- 37. An optical fiber splicing structure as claimed in claim 36, wherein
the splicing end surface of the first optical fiber is connected to the splicing end surface of the second optical fiber through an optical adhesive at the time of splicing the first and second optical fibers.
- 38. An optical fiber splicing structure as claimed in claim 36 or 37, wherein
the splicing end surface of the first optical fiber and the splicing end surface of the second optical fiber are kept in absolute contact with each other at the time of splicing the first and second optical fibers.
- 39. An optical fiber splicing structure as claimed in any one of claims 36 to 38, wherein
said first and second optical fibers are non-silica-based optical fibers.
- 40. An optical fiber splicing structure as claimed in claim 39, wherein
said non-silica-based optical fibers are selected from Zr- or In-based fluoride optical fibers, chalcogenide optical fibers, and tellurite glass optical fibers.
- 41. An optical fiber splicing structure as claimed in claim 39, wherein
the non-silica-based optical fibers are selected from Zr- or In-based fluoride optical fibers, chalcogenide optical fibers, and tellurite glass optical fibers, and furthermore said non-silica-based optical fibers are doped with a rare-earth element.
- 42. An optical fiber splicing structure as claimed in any one of claims 36 to 38, wherein
the first optical fiber is a tellurite glass optical fiber, the second optical fiber is a silica-based optical fiber, and said angle θ1 is of 8 or more degrees.
- 43. An optical fiber splicing structure as claimed in any one of claims 36 to 38, wherein
the first optical fiber is a Zr-based fluoride optical glass fiber, the second optical fiber is a silica-based optical fiber, and said angle θ1 is of 3 or more degrees.
- 44. An optical fiber splicing structure as claimed in any one of claims 36 to 38, wherein
the first optical fiber is an In-based fluoride optical glass fiber, the second optical fiber is a silica-based optical fiber, and said angle θ1 is of 4 or more degrees.
- 45. An optical fiber splicing structure as claimed in any one of claims 36 to 38, wherein
the first optical fiber is a chalcogenide optical glass fiber, the second optical fiber is a silica-based optical fiber, and said angle θ1 is of 8 or more degrees.
- 46. A light source comprising:
an optical amplification medium which is one selected from a group of an erbium-doped tellurite optical fiber and an optical waveguide; and an optical coupler arranged on an end of the optical amplification medium, wherein at least one terminal of the optical coupler is equipped with a reflector.
- 47. A light source as claimed in claim 46:
the erbium-doped tellurite optical fiber or the optical waveguide consisting of the tellurite glass as claimed in any one of claims 1 to 15, 17, and 19.
- 48. A light source as claimed in claim 46 or 47, wherein
the reflector is comprised of one selected from a group of a dielectric-multiple-film filter and a fiber-bragg-grating.
- 49. An optical amplifier using an erbium-doped tellurite optical fiber or an optical waveguide as an optical amplification medium, comprising
an optical coupler arranged on an end of the optical amplification medium, wherein at least one terminal of the optical coupler is equipped with a reflector.
- 50. An optical amplifier as claimed in claim 49, wherein
the erbium-doped tellurite optical fiber or the optical waveguide consisting of the tellurite glass as claimed in any one of claims 1 to 15, 17, and 19.
- 51. An optical amplifier as claimed in claim 49 or 50, wherein
the reflector is comprised of one selected from a group of a dielectric-multiple-film filter and a fiber-bragg-grating.
Priority Claims (7)
Number |
Date |
Country |
Kind |
30430/1997 |
Feb 1997 |
JP |
|
30122/1997 |
Feb 1997 |
JP |
|
226890/1997 |
Aug 1997 |
JP |
|
259806/1997 |
Sep 1997 |
JP |
|
351538/1997 |
Dec 1997 |
JP |
|
351539/1997 |
Dec 1997 |
JP |
|
31874/1998 |
Feb 1998 |
JP |
|
Parent Case Info
[0001] This application is based on Patent Application No. 030,430/1997 filed in Feb. 14, 1997, No. 030,122/1997 filed in Feb. 14, 1997, No. 226,890/1997 filed in Aug. 22, 1997, No. 259,806/1997 filed in Sep. 25, 1997, No. 351,538/1997 filed in Dec. 19, 1997, and No. 351,539/1997 filed in Dec. 19, 1997 in Japan, the content of which is incorporated hereinto by reference.
Divisions (2)
|
Number |
Date |
Country |
Parent |
09710961 |
Nov 2000 |
US |
Child |
10029237 |
Dec 2001 |
US |
Parent |
09023210 |
Feb 1998 |
US |
Child |
09710961 |
Nov 2000 |
US |