CN1971323A - Large-mode-area double-cladding single-mode optical fiber - Google Patents
Large-mode-area double-cladding single-mode optical fiber Download PDFInfo
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- CN1971323A CN1971323A CN 200610119574 CN200610119574A CN1971323A CN 1971323 A CN1971323 A CN 1971323A CN 200610119574 CN200610119574 CN 200610119574 CN 200610119574 A CN200610119574 A CN 200610119574A CN 1971323 A CN1971323 A CN 1971323A
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- optical fiber
- mode
- inner cladding
- refractivity
- refractive index
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Abstract
A great module field double clad single-mode fiber is disclosed, the refractivity of fiber core medium is n1, the inner cladding consists of high refractivity medium n1 and low refractivity medium n2, two mediums have the same angle and periodicity distribution along the circle. The refractivity of cladding is n3(n3<n2<n1). A structure inner cladding has even distributed gas holes, and other structure inner cladding has gas holes just on the low refractivity area. The invention has structure of leaky mode with porous optical fiber, and make the higher modes produce more leakage loss to keep the optical fiber with big core diameter can obtain single module output, the effect of non-linear effect to optical fiber can be reduced by increasing the module field diameter, andsingle module output with high power can be obtained.
Description
Technical field
The present invention relates to single-mode fiber, particularly a kind of large-mode-area double-cladding single-mode optical fiber, its adopts tunnelling ray structure, allows time low-order mode LP
11Have than fundamental transverse mode LP
01Higher leakage loss makes optical fiber when having big fibre core, still can guarantee single mode output.
Background technology
The single mode operation that keeps optical fiber, the core diameter of conventional fiber usually should be less than 9 μ m, but this has also limited the output power of simple optical fiber simultaneously.For obtaining high-power single mode output, the researchist has proposed two kinds of big mould field optical fiber structures:
Porous optical fiber [Opt.Lett., 22 (13), 1997, P961], porous optical fiber has multiple different structure, but its principle of work is roughly the same, can be summed up as " sieve aperture " structure [SCIENCE, 299,2003, P358] visually.The fundamental transverse mode mode field area is less, is completely restricted substantially in fibre core; And high-order mode has bigger mode field area, leaks out optical fiber by the air aperture, guarantees the single mode operation of optical fiber.The core diameter of single mode porous optical fiber is 60 μ m[IEEE J.Sel.Topics Quant.Elect., 12 (2), 2006, P233 to the maximum at present].
The fan-shaped optical fiber of piecemeal [Opt.Lett., 26 (8), 2001, P491], the fan-shaped optical fiber of piecemeal is made up of alternatively distributed high-index regions of periodicity and low-index regions, utilizes the interior different mode of fibre core to have the characteristics of different effective refractive indexs, with fundamental transverse mode LP
01Be limited in the fibre core, and make LP
11Overflow from fibre core and realize single mode output etc. high-order mode.The core diameter of the fan-shaped optical fiber of present stage single mode piecemeal can reach 50 μ m[OFC2002, P620].
Summary of the invention
The objective of the invention is to provide a kind of large-mode-area double-cladding single-mode optical fiber, bigger core diameter with single mode operation, with its core is to utilize higher order mode to have the characteristics of different leakage loss coefficients with fundamental transverse mode in this kind optical fiber, filters higher order mode, reaches the purpose of single mode operation.
Technical solution of the present invention is as follows:
A kind of big mould field single-mode double-clad optical fiber is made up of fibre core, inner cladding and surrounding layer, and the refractive index that is characterized in described fibre core is n
1, described inner cladding is to be respectively n by refractive index
1And n
2Be that material that sector region periodically was alternately distributed, had the air aperture constitutes, the refractive index of described surrounding layer is n
3, and refractive index satisfies relational expression: n
3＜n
2＜n
1
Described fibre core is doped rare earth element erbium Er
3+, ytterbium Yb
3+Quartz, or the optical fiber of other rare earth element of mixing.
Be evenly distributed with the air aperture on the described inner cladding, or the low-index regions of described inner cladding is evenly distributed with the air aperture, this air hole diameter is d ≈ a/20, and wherein a is a core diameter.
Technique effect of the present invention is:
In the tunnelling ray structured optical fiber, inferior high-order mode LP
11The relative fundamental transverse mode LP of leakage loss
01Loss ratio big more, guarantee that the core diameter of single mode operation is also big more.Thereby at fundamental transverse mode LP
01Under the situation that leakage loss remains unchanged substantially, increase time high-order mode LP
11Loss, help to obtain the more fibre core of big mode field area.Adopt the fan-shaped optical fiber matrix of piecemeal, fundamental transverse mode LP
01Substantially be limited in fibre core inside, inferior high-order mode LP
11Overflow by covering.At the piecemeal sector region, introduce the air aperture of regular arrangement, further increase the leakage loss of high-order mode, the diameter d of air aperture can be selected according to the fiber core radius a of optical fiber.Under this structure, fundamental transverse mode LP
01Loss remain unchanged and inferior low-order mode LP substantially
11Loss increase, this just makes optical fiber can obtain single mode under bigger core diameter and exports.The introducing of air aperture has simultaneously also increased the numerical aperture of inner cladding, makes more pump light to enter, and helps the raising of doubly clad optical fiber output power.
Description of drawings
Fig. 1 is the schematic cross-section of the big mould of the present invention field single-mode double-clad optical fiber embodiment 1.
Fig. 2 is the schematic cross-section of the big mould of the present invention field single-mode double-clad optical fiber embodiment 2.
Embodiment
The invention will be further described below in conjunction with embodiment and accompanying drawing, but should not limit protection scope of the present invention with this.
See also Fig. 1 and Fig. 2, Fig. 1 is the schematic cross-section of the big mould of the present invention field single-mode double-clad optical fiber embodiment 1, and Fig. 2 is the schematic cross-section of the big mould of the present invention field single-mode double-clad optical fiber embodiment 2.As seen from the figure, the big mould of the present invention field single-mode double-clad optical fiber is made up of fibre core 1, inner cladding 2 and surrounding layer 3, and the refractive index of described fibre core 1 is n
1, described inner cladding 2 is to be respectively n by refractive index
1And n
2Periodically be alternately that material that sector region distributes, has air aperture 4 constitutes, the refractive index of described surrounding layer 3 is n
3, and refractive index satisfies relational expression: n
3＜n
2＜n
1
(0＜r＜a) is a doped silica glass to the fibre core 1 of doubly clad optical fiber, and refractive index is n
1, can mix different rare earth element (as erbium Er according to different needs
3+, ytterbium Yb
3+Deng).(a＜r＜b) for periodically being alternately distributed, having the piecemeal fan section of air aperture 4, high-index regions is identical with core material, and refractive index is n for inner cladding 2
1Low-index regions adopts pure quartz, and refractive index is n
2, with n
1Very approaching, relative index of refraction
High-index regions has identical angle with low-index regions, and promptly each sector is 22.5 ° of angles.
Structure shown in Figure 1 has the equally distributed air aperture of circumferencial direction on inner cladding 2; And in the structure shown in Figure 2,4 of air apertures evenly distribute at the low-refraction n2 district of inner cladding 2 circumferencial direction.Radius of a circle is respectively r
1(a＜r
1＜b/3), inner cladding 2
R1, surrounding layer 3
R1, the diameter of air aperture 4 is d ≈ a/20.Surrounding layer 3 has minimum refractive index n 3, and (n3＜n2＜n1) is for mixing the quartz glass of fluorine element.Utilize the drawing method of present porous optical fiber, only need allow the inner cladding cyclical variation can realize the drawing of optical fiber among the present invention.
Technique effect:
To mix ytterbium Yb
3+Optical fiber is example, and operation wavelength λ is about 1100nm, Δ=0.4%, a=36 μ m, b=120 μ m, d=1.8 μ m.The diameter of fiber core is 72 μ m, and result of calculation shows that the leakage loss of inferior low-order mode LP11 is about 1.5dB/m, and the leakage loss of fundamental transverse mode LP01 is the 10-5 magnitude.When fiber lengths surpassed 10m, LP11 is loss fully substantially, and can ignore to the loss of LP01, thereby can successfully realize the single mode operation of optical fiber.
Claims (4)
1, a kind of big mould field single-mode double-clad optical fiber is made up of fibre core, inner cladding and surrounding layer, and the refractive index that it is characterized in that described fibre core is n
1, described inner cladding is to be respectively n by refractive index
1And n
2Periodically be alternately that material that sector region distributes, has the air aperture constitutes, the refractive index of described surrounding layer is n
3, and refractive index satisfies relational expression: n
3＜n
2＜n
1
2, big mould according to claim 1 field single-mode double-clad optical fiber is characterized in that described fibre core is doped rare earth element erbium Er
3+, ytterbium yb
3+Quartz.
3. big mould according to claim 1 and 2 field single-mode double-clad optical fiber is characterized in that being evenly distributed with on the described inner cladding air aperture, and the diameter of this air aperture is d ≈ a/20, and wherein a is a core diameter.
4, big mould according to claim 1 and 2 field single-mode double-clad optical fiber is characterized in that the low-index regions of described inner cladding is evenly distributed with the air aperture, and the diameter of this air aperture is d ≈ a/20, and wherein a is a core diameter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610119574 CN1971323A (en) | 2006-12-13 | 2006-12-13 | Large-mode-area double-cladding single-mode optical fiber |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610119574 CN1971323A (en) | 2006-12-13 | 2006-12-13 | Large-mode-area double-cladding single-mode optical fiber |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1971323A true CN1971323A (en) | 2007-05-30 |
Family
ID=38112230
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200610119574 Pending CN1971323A (en) | 2006-12-13 | 2006-12-13 | Large-mode-area double-cladding single-mode optical fiber |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101938080A (en) * | 2010-06-25 | 2011-01-05 | 北京交通大学 | Active optical fiber with characteristics of single-mode output TM01 mode |
| CN101625438B (en) * | 2009-08-11 | 2012-01-04 | 长飞光纤光缆有限公司 | Bend insensitive single mode optic fiber with large effective area and manufacturing method thereof |
| CN102939552A (en) * | 2009-10-15 | 2013-02-20 | Ipg光子公司 | Optical fiber apparatus with suppression of higher order modes |
| CN107870389A (en) * | 2017-11-15 | 2018-04-03 | 北京交通大学 | A kind of counter-bending single-mode fiber of large mode field of parabolic core coupling flap core |
| CN108333673A (en) * | 2018-01-04 | 2018-07-27 | 南京邮电大学 | A kind of heterogeneous fragmented packets layer large mould field single mode optical fiber |
| CN113589425A (en) * | 2021-08-05 | 2021-11-02 | 华南师范大学 | Multi-core microstructure optical fiber |
-
2006
- 2006-12-13 CN CN 200610119574 patent/CN1971323A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101625438B (en) * | 2009-08-11 | 2012-01-04 | 长飞光纤光缆有限公司 | Bend insensitive single mode optic fiber with large effective area and manufacturing method thereof |
| CN102939552A (en) * | 2009-10-15 | 2013-02-20 | Ipg光子公司 | Optical fiber apparatus with suppression of higher order modes |
| CN102939552B (en) * | 2009-10-15 | 2015-06-17 | Ipg光子公司 | Optical fiber apparatus with suppression of higher order modes |
| CN101938080A (en) * | 2010-06-25 | 2011-01-05 | 北京交通大学 | Active optical fiber with characteristics of single-mode output TM01 mode |
| CN107870389A (en) * | 2017-11-15 | 2018-04-03 | 北京交通大学 | A kind of counter-bending single-mode fiber of large mode field of parabolic core coupling flap core |
| CN107870389B (en) * | 2017-11-15 | 2019-10-25 | 北京交通大学 | A kind of counter-bending single mode optical fiber of large mode field of parabolic core coupling petaloid core |
| CN108333673A (en) * | 2018-01-04 | 2018-07-27 | 南京邮电大学 | A kind of heterogeneous fragmented packets layer large mould field single mode optical fiber |
| CN113589425A (en) * | 2021-08-05 | 2021-11-02 | 华南师范大学 | Multi-core microstructure optical fiber |
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