WO2005003828A1 - フォトニック結晶ファイバ - Google Patents
フォトニック結晶ファイバ Download PDFInfo
- Publication number
- WO2005003828A1 WO2005003828A1 PCT/JP2004/009780 JP2004009780W WO2005003828A1 WO 2005003828 A1 WO2005003828 A1 WO 2005003828A1 JP 2004009780 W JP2004009780 W JP 2004009780W WO 2005003828 A1 WO2005003828 A1 WO 2005003828A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- photonic crystal
- holes
- crystal fiber
- core
- diameter
- Prior art date
Links
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/02—Optical fibres with cladding with or without a coating
- G02B6/02295—Microstructured optical fibre
- G02B6/02314—Plurality of longitudinal structures extending along optical fibre axis, e.g. holes
- G02B6/02319—Plurality of longitudinal structures extending along optical fibre axis, e.g. holes characterised by core or core-cladding interface features
- G02B6/02333—Core having higher refractive index than cladding, e.g. solid core, effective index guiding
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/02—Optical fibres with cladding with or without a coating
- G02B6/02295—Microstructured optical fibre
- G02B6/02314—Plurality of longitudinal structures extending along optical fibre axis, e.g. holes
- G02B6/02319—Plurality of longitudinal structures extending along optical fibre axis, e.g. holes characterised by core or core-cladding interface features
- G02B6/02338—Structured core, e.g. core contains more than one material, non-constant refractive index distribution in core, asymmetric or non-circular elements in core unit, multiple cores, insertions between core and clad
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/02—Optical fibres with cladding with or without a coating
- G02B6/02295—Microstructured optical fibre
- G02B6/02314—Plurality of longitudinal structures extending along optical fibre axis, e.g. holes
- G02B6/02342—Plurality of longitudinal structures extending along optical fibre axis, e.g. holes characterised by cladding features, i.e. light confining region
- G02B6/02361—Longitudinal structures forming multiple layers around the core, e.g. arranged in multiple rings with each ring having longitudinal elements at substantially the same radial distance from the core, having rotational symmetry about the fibre axis
Definitions
- the present invention relates to an optical fiber, and more particularly to a photonic crystal fiber having a photonic crystal structure in a cladding part.
- photonic crystal fibers have been fabricated with a structure in which light in the 1300 nm band does not leak out even if the fiber is bent to a diameter of 3 mm or less (for example, T. A. Briks et. , Electr on Lett., Vol. 31, No. 22, 1995s p. 1941—1943, JC Knihtet. A l., Ot. Lett., Vol. 21, No. 19, 1996, p.
- the geometric core diameter is less than about 8 ⁇ m, Since the crystal field has a mode field diameter of about 70% of the geometric core diameter, the compatibility with single-mode optical fibers with a mode field diameter of 8 / m to 10 ⁇ m is low. There was.
- the present invention has been made in view of such a point, and an object thereof is to provide a single-mode optical fiber in which a mode field diameter obtained as a result of a geometric core diameter and a dispersion value in a 130 O nm band are ordinary.
- the aim is to realize a photonic crystal fiber that is equivalent to, but that suppresses light leakage due to bending.
- an optical fiber which is made of glass or plastic or a medium which is transparent at a wavelength used, and has a core portion for guiding light, and a cladding portion disposed around the core portion.
- the clad portion has a large number of substantially circular or substantially elliptical or substantially polygonal holes provided along the longitudinal direction, and the inside of the holes is transparent at a vacuum or a used wavelength, and
- the core In a photonic crystal optical fiber filled with a gas, liquid, or solid having a lower refractive index than the medium, the core has a region with a higher refractive index at the center than its surroundings, and the holes in the cladding are cores. Are arranged so as to surround two or more, preferably three or more.
- the number of holes in the clad portion When the number of holes in the clad portion is single, light leaks from the gap between the holes, and there is a phenomenon that the loss increases sharply particularly on the long wavelength side.
- the number of holes By setting the number of holes to be two or more, preferably three or more, it is possible to prevent light from leaking from a gap between the holes, thereby suppressing an increase in loss on the long wavelength side. Light leakage due to bending can be suppressed without increasing the dispersion value in the 300 nm band.
- the geometric core diameter defined by (2 ⁇ —d) is 1 2
- the mode field diameter can be set to approximately 8 ⁇ m or more, thereby improving compatibility and connectivity with ordinary single mode fiber.
- the absolute value of the dispersion value in the wavelength of 1300 nm is set to 5 ps / km / nm or less, or 1 ps / km / nm or less, it is possible to suppress the spread of the optical pulse and increase the transmission speed. It becomes possible.
- FIG. 1 is an enlarged cross-sectional view near the center showing an example of a photonic crystal fiber according to an embodiment of the present invention.
- FIG. 2 is a graph showing the bending diameter and the bending diameter of the photonic crystal fiber of the present invention at a wavelength of 130 O nm.
- FIG. 3 is a graph showing a simulation result of a relationship with transmittance, and FIG. 3 is a graph showing a measurement result of a loss when a wavelength is changed in a photonic crystal fiber.
- FIG. 1 is an enlarged cross-sectional view near the center showing an example of an embodiment of the photonic crystal fiber of the present invention.
- the photonic crystal fiber of the present invention is made of quartz glass and includes a core part 10 for guiding light, and a cladding part 20 disposed around the core part 10. Note that the broken line in FIG. 1 indicates the approximate range of the core 10.
- any medium that is transparent at the wavelength used such as plastic such as PMMA, can be used.
- the core part 10 is composed of a high refractive index part 11 and a low refractive index part 12, the high refractive index part 11 is disposed at the center, and the low refractive index part 12 is around the high refractive index part 11.
- the high refractive index portion 11 can be realized by adding an additive such as germanium or phosphorus to the glass.
- the low refractive index portion 12 is a portion having a lower refractive index than the high refractive index portion 11, and the amount of the above additive is reduced compared to the high refractive index portion 11, or is not added, or fluorine is added. Addition or low refractive index part 1 2 without adding additive to high refractive index part 11 This can be realized by adding fluorine or the like.
- the clad portion 20 has a large number of substantially circular holes 21 provided along the longitudinal direction of the fiber, and the holes 21 are arranged so as to surround the core portion 10 three times.
- the arrangement of the holes 21 forms a hexagonal close-packed structure, but the arrangement is not limited to this, and it is sufficient if the holes 21 are substantially uniformly distributed.
- This figure is an enlarged view of the vicinity of the center of the optical fiber, and the portion where no holes are formed actually extends around the center.
- the photonic crystal fiber of the present embodiment is formed by drilling a hole in a glass fiber base material manufactured by a VAD method or the like, and then performing melt-drawing. It can be made by a method such as melting and stretching.
- the inside of the holes 21 is filled with air, but the inside of the holes 21 is a gas or liquid which is transparent at a vacuum or the wavelength used and has a lower refractive index than the above medium, or It only has to be filled with solids.
- the average center distance between adjacent holes is 10.9 zm
- the diameter da of the high-refractive-index portion was 3.3 ⁇ m
- the relative refractive index difference ⁇ ⁇ ⁇ ⁇ of the high-refractive-index portion with respect to quartz glass was + 0.3%.
- the geometric cross section 2 ⁇ —d is 18.5 ⁇ m.
- the absolute value of the dispersion value in the 1300 nm wavelength band is less than 0.1 ps / km / nm.
- FIG. 2 shows the simulation results (calculated values) of the relationship between the transmissivity and the bending diameter of the photonic crystal fiber of the present invention at a wavelength of 130 Onm (however, the number of turns is 1) for each example. is there.
- the geometric cross section 2 ⁇ —d is 17.7 ⁇ m.
- the absolute value of the dispersion value in the wavelength range of 130 Onm is less than 0.1 ps / km / nm.
- the transmittance of one turn of the fiber of Example 2 with a bend diameter of 10 mm is 92% or more (loss is 0.4 dB or less), and the transmittance is 5 turns or more (up to 8 turns). It can be seen that the loss can be suppressed to 3 dB or less. Furthermore, in Example 2, it can be seen that when wound once with a bending diameter of 3 mm, the transmittance is 68% or more.
- the geometrical cross section 2 ⁇ —d is 16.8 ⁇ m. Further, the absolute value of the dispersion value in the wavelength band of 1300 nm is less than 0.1 ps / km / nm.
- the transmittance of the fiber of Example 3 when it is wound once with a bending diameter of 10 mm is 95% or more (loss is 0.2 dB or less), and the transmittance is 5 times or more (1 3 It can be seen that the loss can be suppressed to 3 dB or less. Further, in Example 3, it can be seen that when wound once with a bending diameter of 3 mm, the transmittance is 76% or more.
- Fig. 3 shows the measurement results of the loss when the wavelength (standardized by ⁇ ) was changed in the photonic crystal fiber.
- Fig. 3 (a) shows a single hole in the cladding.
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Optical Fibers, Optical Fiber Cores, And Optical Fiber Bundles (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2003192207A JP2005025056A (ja) | 2003-07-04 | 2003-07-04 | フォトニック結晶ファイバ |
JP2003-192207 | 2003-07-04 |
Publications (1)
Publication Number | Publication Date |
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WO2005003828A1 true WO2005003828A1 (ja) | 2005-01-13 |
Family
ID=33562392
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2004/009780 WO2005003828A1 (ja) | 2003-07-04 | 2004-07-02 | フォトニック結晶ファイバ |
Country Status (2)
Country | Link |
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JP (1) | JP2005025056A (ja) |
WO (1) | WO2005003828A1 (ja) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2012114476A (ja) * | 2012-03-16 | 2012-06-14 | Sumitomo Electric Ind Ltd | 増幅用光ファイバ |
CN112363269A (zh) * | 2020-12-11 | 2021-02-12 | 东北石油大学 | 一种高双折射低限制损耗光子准晶光纤 |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2008108269A1 (ja) * | 2007-03-05 | 2008-09-12 | Fujikura Ltd. | フォトニックバンドギャップファイバ |
WO2008108404A1 (ja) | 2007-03-05 | 2008-09-12 | Fujikura Ltd. | フォトニックバンドギャップファイバ |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1999000685A1 (en) * | 1997-06-26 | 1999-01-07 | The Secretary Of State For Defence | Single mode optical fibre |
WO2003019257A1 (en) * | 2001-08-30 | 2003-03-06 | Crystal Fibre A/S | Optical fibre with high numerical aperture, method of its production, and use thereof |
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2003
- 2003-07-04 JP JP2003192207A patent/JP2005025056A/ja active Pending
-
2004
- 2004-07-02 WO PCT/JP2004/009780 patent/WO2005003828A1/ja active Application Filing
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1999000685A1 (en) * | 1997-06-26 | 1999-01-07 | The Secretary Of State For Defence | Single mode optical fibre |
WO2003019257A1 (en) * | 2001-08-30 | 2003-03-06 | Crystal Fibre A/S | Optical fibre with high numerical aperture, method of its production, and use thereof |
Non-Patent Citations (2)
Title |
---|
EGGLETON B J, ET AL: "Grating resonances in air-silica microstructured optical fibers", OPTICS LETTERS, vol. 24, no. 21, 1 November 1999 (1999-11-01), pages 1460 - 1462, XP000893674 * |
NIELSEN M D, ET AL: "All-silica photonic crystal fiber with large mode area", EUROPEAN CONFERENCE ON OPTICAL COMMUNICATION 2002 (ECOC 2002), vol. 2, 10 September 2002 (2002-09-10), XP001158514 * |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2012114476A (ja) * | 2012-03-16 | 2012-06-14 | Sumitomo Electric Ind Ltd | 増幅用光ファイバ |
CN112363269A (zh) * | 2020-12-11 | 2021-02-12 | 东北石油大学 | 一种高双折射低限制损耗光子准晶光纤 |
Also Published As
Publication number | Publication date |
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JP2005025056A (ja) | 2005-01-27 |
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