CN205263347U - Optic fibre that match optic fibre mould field - Google Patents
Optic fibre that match optic fibre mould field Download PDFInfo
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- CN205263347U CN205263347U CN201520938067.XU CN201520938067U CN205263347U CN 205263347 U CN205263347 U CN 205263347U CN 201520938067 U CN201520938067 U CN 201520938067U CN 205263347 U CN205263347 U CN 205263347U
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- field diameter
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Abstract
The utility model provides an optic fibre that match optic fibre mould field, its include first optic fibre, second optic fibre and set up in first optic fibre with at least transition fiber between the second optic fibre. When the scheme is adopted, the utility model discloses set up the transition fiber, need not to adopt optic fibre mould field adapter to connect, practiced thrift the cost, when target optic fibre mould field deviation is great, still can realize better matching to avoid optical quality degradation that direct butt fusion resulted in and butt fusion loss can not control the problem, had very high market using value.
Description
Technical field
The utility model relates to fibre-optic mode field diameter matching technique, in particular, and a kind of optical fiber of optical fiber mode fields coupling.
Background technology
The diameter of mould field (ModeField), i.e. mode field diameter (MFD, ModeFieldDiameter), the distribution of the core region basic mode light that is used for being characterized in single-mode fiber. Basic mode is in core region axial line place light intensity maximum, and along with the distance of disalignment line increases and weakens gradually. Generally mode field diameter is defined as to light intensity and is reduced to the 1/e of axial line place largest light intensity2Each point in 2 ultimate ranges. The size of mode field diameter has relation with the wavelength using, along with the increase mode field diameter of wavelength increases. 1310nm representative value: 9.2 ± 0.5 μ m, 1550nm representative value: 10.5 ± 1.0 μ m. In optical fiber, light energy not exclusively concentrates in fibre core and transmits, and portion of energy is transmitted in covering, and the diameter of fibre core can not reflect the distribution of light energy in optical fiber, and it has the concept of mode field diameter. Mode field diameter is exactly to describe the parameter of luminous energy intensity in single-mode fiber, and effective area is identical with the physical significance of mode field diameter. Can utilize area formula of circle to calculate effective area by mode field diameter. Mode field diameter is mainly relevant to the energy density by optical fiber with effective area. Mode field diameter is less, just larger by the energy density of cross section of optic fibre. In the time that the energy density by optical fiber is excessive, can cause the nonlinear effect of optical fiber, cause the OSNR of system to reduce, greatly affect systematic function. Therefore,, for Transmission Fibers, mode field diameter (or effective area) is the bigger the better.
Fused fiber splice is will in two sections of optical cables, to need the optical fiber difference of connection with full automatic special equipment fusion splicer (FusionSplitter)---couples together, when welding, adopt molten two fiber end faces of brief electrical arcing to make it to be connected, this method of attachment joint volume is little, mechanical strength is high, stable performance after fibre junction, thereby is widely used. After fibre junction, light transmission can produce certain waste and be referred to as splice loss, splice attenuation or connecting loss to joint. Due to the parameter such as visitor's limit, the non-relay amplification transmission range of fibre circuit of fibre junction quality influence fibre circuit loss, therefore require the splice loss, splice attenuation at fibre-optical splice place as far as possible little, to guarantee the transmission quality of fiber-optic signal. In optical fiber laser, often the optical fiber of not isotype need to be connected, if directly welding, splice loss, splice attenuation is uncontrollable, and can introduce more optical modes, and beam quality is deteriorated. That is to say; current scheme is all to adopt the first optical fiber and the second optical fiber direct to connect in succession; no matter be that welding is drawn cone, burnt ball or Space Coupling; these methods or be to need special fiber end face processing; be the low measure that needs protection of stability, this just causes the cost of processing high, and splice loss, splice attenuation is uncontrollable; beam quality is deteriorated, is difficult to guarantee the transmission quality of fiber-optic signal.
For example, for addressing the above problem, in existing connection, adopt optical fiber mode fields adapter to connect the optical fiber of not isotype. But prior art, in the time that target optical fiber mode fields deviation is larger, is difficult to realize preferably coupling, and this device manufacture has relatively high expectations, expensive.
Therefore, there is defect in prior art, needs to improve.
Utility model content
Technical problem to be solved in the utility model is how to realize a kind of optical fiber newly, that deteriorated without employing optical fiber mode fields beam quality adapter, that avoid direct welding to cause and the uncontrollable optical fiber mode fields of splice loss, splice attenuation is mated.
The technical solution of the utility model is as follows: the optical fiber of a kind of optical fiber mode fields coupling, it comprise the first optical fiber, the second optical fiber and be arranged at described the first optical fiber and described the second optical fiber between at least one transition optical fiber.
Preferably, in described optical fiber, described the first optical fiber, at least one described transition optical fiber and described the second fused fiber splice.
Preferably, in described optical fiber, only arrange one described in transition optical fiber.
Preferably, in described optical fiber, arrange two described in transition optical fiber.
Preferably, in described optical fiber, the quantity of described transition optical fiber is greater than at 1 o'clock, and the numerical aperture of described the first optical fiber, each described transition optical fiber and described the second optical fiber is monotone sequence of numbers; And the mode field diameter of described the first optical fiber, each described transition optical fiber and described the second optical fiber is monotone sequence of numbers.
Preferably, in described optical fiber, quantity and the specification of described transition optical fiber is set according to the mode field diameter difference of described the first optical fiber and described the second optical fiber.
Preferably, in described optical fiber, when the first absolute value of the mode field diameter difference of described the first optical fiber and described the second optical fiber is greater than the first preset value, according to described the first absolute value and with the ratio of described the first preset value, quantity and the specification of described transition optical fiber are set.
Preferably, in described optical fiber, quantity and the specification of described transition optical fiber is set according to the numerical aperture difference of described the first optical fiber and described the second optical fiber.
Preferably, in described optical fiber, when the second absolute value of the numerical aperture difference of described the first optical fiber and described the second optical fiber is greater than the second preset value, quantity and the specification of described transition optical fiber is set according to the ratio of itself and described the second preset value.
Preferably, in described optical fiber, the numerical aperture of described transition optical fiber is between the numerical aperture of described the first optical fiber and the numerical aperture of described the second optical fiber, and the mode field diameter of described transition optical fiber is between the mode field diameter of described the first optical fiber and the mode field diameter of described the second optical fiber.
Adopt such scheme, the utility model arranges transition optical fiber, without adopting optical fiber mode fields adapter to connect, has saved cost; In the time that target optical fiber mode fields deviation is larger, still can realize good coupling, and the beam quality of having avoided direct welding to cause is deteriorated and the uncontrollable problem of splice loss, splice attenuation, has very high market using value.
Brief description of the drawings
Fig. 1 is one of schematic diagram of an embodiment of the present utility model;
Fig. 2 be the utility model Fig. 1 embodiment schematic diagram two;
Fig. 3 be the utility model Fig. 1 embodiment schematic diagram three.
Detailed description of the invention
For the ease of understanding the utility model, below in conjunction with the drawings and specific embodiments, the utility model is described in detail. In this description and accompanying drawing thereof, provided preferred embodiment of the present utility model, still, the utility model can be realized in many different forms, is not limited to the described embodiment of this description. On the contrary, providing the object of these embodiment is to make to the understanding of disclosure of the present utility model more thoroughly comprehensively.
It should be noted that, when a certain element is fixed on another element, comprise this element is directly fixed on to this another element, or this element is fixed on to this another element by least one other element placed in the middle. When an element connects another element, comprise this element is directly connected to this another element, or this element is connected to this another element by least one other element placed in the middle.
An embodiment of the present utility model is, a kind of optical fiber of optical fiber mode fields coupling, it comprise the first optical fiber, the second optical fiber and be arranged at described the first optical fiber and described the second optical fiber between at least one transition optical fiber. For example, as shown in Figure 1, the optical fiber of a kind of optical fiber mode fields coupling, it comprise the first optical fiber 101, the second optical fiber 102 and be arranged at described the first optical fiber and described the second optical fiber between transition optical fiber 200; Preferably, the commercially available optical fiber that described transition optical fiber is standard specification, like this, additionally another standby material, convenient application; Or, in order to promote operating efficiency, to reduce job step, preferred, in described optical fiber, only arrange one described in transition optical fiber. For example, as shown in Figure 2, described transition optical fiber 200 is preformed fibers, and it is set to truncated conical shape, and the upper bottom surface of described round platform equates with the end face of the first optical fiber, and the bottom surface of described round platform equates with the end face of the second optical fiber; Wherein, remove truncated cone by a plane that is parallel to circular cone bottom surface, the part between bottom surface and cross section is called round platform; Like this, the no matter specification difference of described the first optical fiber and described the second optical fiber, only arranges transition optical fiber described in and can realize the optical fiber of not isotype and connect, thereby reduced job step, has promoted operating efficiency. Preferably, deteriorated for fear of beam quality, guarantee the transmission quality of fiber-optic signal, the height of described round platform is greater than the bottom surface of described round platform and the radius difference of upper bottom surface 10 times; For example, the radius of the bottom surface of described round platform is 30 microns, and the radius of the upper bottom surface of described round platform is 20 microns. Preferably, in described optical fiber, described the first optical fiber, at least one described transition optical fiber and described the second fused fiber splice. Preferably, in described optical fiber, described the first optical fiber, at least one described transition optical fiber and described the second optical fiber order welding. Like this, the optical fiber obtaining, do as a whole, include the first optical fiber, the second optical fiber and be arranged at described the first optical fiber and described the second optical fiber between the integral optical fiber of at least one transition optical fiber, its connection is simple and reliable, do not need special installation, make simple, with low cost.
Preferably, in described optical fiber, arrange two described in transition optical fiber. As shown in Figure 3, the optical fiber of a kind of optical fiber mode fields coupling, it comprise the first optical fiber 101, the second optical fiber 102 and be arranged at described the first optical fiber and described the second optical fiber between First Transition optical fiber 201, the second transition optical fiber 202. Quantity and the specification of described transition optical fiber preferably, are set according to the mode field diameter difference of described the first optical fiber and described the second optical fiber; For example, the mode field diameter of First Transition optical fiber is the mode field diameter of described the first optical fiber, adds a variable, and described variable is the first absolute value/((the first absolute value/the first preset value)+1), the mode field diameter of the second transition optical fiber is the mode field diameter of described the second optical fiber, deducts described variable. Preferably, in described optical fiber, described the first optical fiber, at least one described transition optical fiber and described the second optical fiber order welding. For example, as shown in Figure 3, the first optical fiber 101, First Transition optical fiber 201, the second transition optical fiber 202, the second optical fiber 102 order weldings; Order has the first weld portion 301, the second weld portion 302, the 3rd weld portion 303 therebetween. Like this, need not specially treated, only need welding to add heat-shrink tube by transition optical fiber and can realize the first optical fiber and be connected with the second optical fiber.
For example, the numerical aperture of described the first optical fiber, First Transition optical fiber, the second transition optical fiber, the 3rd transition optical fiber and described the second optical fiber is respectively 0.12,0.12,0.12,0.13,0.14; Preferably, in described optical fiber, the quantity of described transition optical fiber is greater than at 1 o'clock, the numerical aperture of described the first optical fiber, each described transition optical fiber and described the second optical fiber is monotone sequence of numbers, for example the numerical aperture of described the first optical fiber, each described transition optical fiber and described the second optical fiber is ascending series, for example, the numerical aperture of described the first optical fiber, First Transition optical fiber, the second transition optical fiber and described the second optical fiber is respectively 0.12,0.13,0.14,0.15; Or the numerical aperture of described the first optical fiber, each described transition optical fiber and described the second optical fiber is decreasing sequence of numbers, for example, the numerical aperture of described the first optical fiber, First Transition optical fiber, the second transition optical fiber, the 3rd transition optical fiber and described the second optical fiber is respectively 0.16,0.15,0.14,0.13,0.12; And the mode field diameter of described the first optical fiber, each described transition optical fiber and described the second optical fiber is monotone sequence of numbers; For example the mode field diameter of described the first optical fiber, each described transition optical fiber and described the second optical fiber is ascending series, for example, the mode field diameter of described the first optical fiber, First Transition optical fiber, the second transition optical fiber, the 3rd transition optical fiber and described the second optical fiber is respectively 10 microns, 15 microns, 20 microns, 25 microns, 30 microns; Or the mode field diameter of described the first optical fiber, each described transition optical fiber and described the second optical fiber is decreasing sequence of numbers, for example, the mode field diameter of described the first optical fiber, First Transition optical fiber, the second transition optical fiber and described the second optical fiber is respectively 25 microns, 20 microns, 15 microns, 10 microns. Preferably, for cost-saving, select as far as possible to utilize existing product as transition optical fiber, instead of special.
Preferably, in order to realize better transition effect, thereby realize good matching effect, guarantee the transmission quality of fiber-optic signal; In described optical fiber, quantity and the specification of described transition optical fiber is set according to the mode field diameter difference of described the first optical fiber and described the second optical fiber. For example, less or transition optical fiber is set greatly than the mode field diameter of described the second optical fiber according to the mode field diameter of described the first optical fiber. Preferably, in described optical fiber, when the first absolute value of the mode field diameter difference of described the first optical fiber and described the second optical fiber is greater than the first preset value, according to described the first absolute value and with the ratio of described the first preset value, quantity and the specification of described transition optical fiber are set. Preferably, described ratio is rounded to operation. For example, the first preset value is made as 1,2,3,4,5,6,7,8,9 or 10 micron. Preferably, the first preset value is 4,5 or 6 microns; Preferably, adopt mode field diameter as main reference quantity, so that quantity and the specification of described transition optical fiber to be set. Although mode field diameter is only a numeral, the key character that it belongs to optical fiber, defines the specification of optical fiber, thereby defines the structure of optical fiber. For example, the first absolute value of the mode field diameter difference of described the first optical fiber and described the second optical fiber is 10 microns, the first preset value is 5 microns, 10/5=2 root transition optical fiber is set, and wherein, the mode field diameter of First Transition optical fiber is the mode field diameter of described the first optical fiber, add 3.3 microns, be described variable be 10 microns/((10 microns/5 microns)+1)=3.3 microns, the mode field diameter of the second transition optical fiber is the mode field diameter of described the second optical fiber, deducts 3.3 microns. And for example, the first preset value is 8 microns, according to 10/8=1.25, rounding 1.25 is 1, and a transition optical fiber is only set, and its mode field diameter is the mode field diameter of described the first optical fiber, add 5 microns, described variable be 10 microns/((1.25 round)+1)=5 microns. And for example, the first absolute value of the mode field diameter difference of described the first optical fiber and described the second optical fiber is 11 microns, the first preset value is 4 microns, according to 11/4=2.75,2 transition optical fibers is set, wherein, the mode field diameter of First Transition optical fiber is the mode field diameter of described the first optical fiber, adds 3.7 microns, described variable be 11 microns/((2.75 round)+1)=3.7 microns, the mode field diameter of the second transition optical fiber is the mode field diameter of described the second optical fiber, deducts 3.7 microns. All the other embodiment all can by that analogy, repeat no more.
Numerical aperture size and the fiber core refractive index of optical fiber, and fibre core-covering refractive index contrast is relevant. See physically, the numerical aperture (NA) of optical fiber represents that optical fiber receives the ability of incident light. NA is larger, and the ability of optical fiber reception light is also stronger. From increasing the viewpoint of the luminous power that enters optical fiber, NA is the bigger the better, because the numerical aperture of optical fiber is favourable for the docking of optical fiber greatly a bit. When but NA is too large, the mould distortion of optical fiber strengthens, and can affect bandwidth of an optical fiber. Therefore,, in optical fiber telecommunications system, the numerical aperture of optical fiber is had to certain requirement. Conventionally in order most effectively light to be injected in optical fiber and to be gone, should adopt the lens that its numerical aperture is identical with Optical Fiber Numerical Aperture to carry out light harvesting. Preferably, in described optical fiber, quantity and the specification of described transition optical fiber is also set according to the numerical aperture difference of described the first optical fiber and described the second optical fiber. Preferably, in described optical fiber, when the second absolute value of the numerical aperture difference of described the first optical fiber and described the second optical fiber is greater than the second preset value, quantity and the specification of described transition optical fiber is set according to the ratio of itself and described the second preset value. For example, the numerical aperture of the first optical fiber is that the numerical aperture of 0.14, the second optical fiber is 0.12, and difference is that 0.02, the second preset value is assumed to be 0.01, and ratio is 2, and two transition optical fibers are set. And for example, the numerical aperture of the first optical fiber is that the numerical aperture of 0.12, the second optical fiber is 0.10, and difference is that 0.02, the second preset value is assumed to be 0.02, and ratio is 1, and a transition optical fiber is set.
Preferably, in the various embodiments described above, the quantity of transition optical fiber can determine according to the difference of two target Optical Fiber Numerical Aperture and mode field diameter, when differing larger, both can increase transition optical fiber quantity, if when two target optical fiber relatively approach, an available transition optical fiber, can be with 3 or more transition optical fibers when difference is larger; Fusion point only needs common heat sealing machine to complete, and can optimize welder according to actual effect afterwards. The welder that fused fiber splice is mainly used is now heat sealing machine; and welding effect be mainly subject to discharge power and discharge time joint effect; simple point can rule of thumb arrange several groups of parameters by heuristic and see welding effect; also can be optimized to preferably effect by DOE method; welding process belongs to prior art; not the utility model scope required for protection, but can effectively be applied to the utility model and each embodiment thereof.
Preferably, in the various embodiments described above, the numerical aperture of described transition optical fiber is between the numerical aperture of described the first optical fiber and the numerical aperture of described the second optical fiber, and the mode field diameter of described transition optical fiber is between the mode field diameter of described the first optical fiber and the mode field diameter of described the second optical fiber.
Preferably, in described optical fiber, for obtaining better protection effect, at each described fusion point, place is nested with a protective sleeve, and its internal diameter is slightly larger than the external diameter of a thicker optical fiber of fusion point place.
Like this, the utility model and each embodiment thereof, only need find the relevant transition optical fiber of mode field diameter, numerical aperture that connects optical fiber for need, and successively be welded together, then optimize welding setting and reach better effect. For example, in Hi1060(numerical aperture 0.14) and 20/125(numerical aperture 0.12) in the mode field diameter coupling of two optical fiber, an example is, add 8/125(numerical aperture 0.14), 10/125(numerical aperture 0.14) and 20/125 optical fiber of large mode field diameter, welding successively, after tested, effect is better than the mode field diameter adapter of Hi1060 and 20/125.
Further, embodiment of the present utility model also comprises, each technical characterictic of the various embodiments described above, the optical fiber of the optical fiber mode fields coupling being mutually combined to form, the utility model, by increasing transition optical fiber, is not that two target optical fiber are directly connected, when welding connects, do not need special welding processing, also do not need junction to do specially treated, welding is convenient, and cost is very low, can realize not isotype optical fiber of multiclass and connect, and effect is better than optical fiber mode fields adapter.
It should be noted that, above-mentioned each technical characterictic continues combination mutually, forms the various embodiment that do not enumerate in the above, is all considered as the scope that the utility model description is recorded; And, for those of ordinary skills, can be improved according to the above description or convert, and all these improvement and conversion all should belong to the protection domain of the utility model claims.
Claims (6)
1. an optical fiber for optical fiber mode fields coupling, is characterized in that, comprise the first optical fiber, the second optical fiber and be arranged at described the first optical fiber and described the second optical fiber between at least one transition optical fiber.
2. optical fiber according to claim 1, is characterized in that described the first optical fiber, at least one described transition optical fiber and described the second fused fiber splice.
3. optical fiber according to claim 2, is characterized in that, only arrange one described in transition optical fiber.
4. optical fiber according to claim 2, is characterized in that, arrange two described in transition optical fiber.
5. optical fiber according to claim 2, is characterized in that, the quantity of described transition optical fiber is greater than at 1 o'clock, and the numerical aperture of described the first optical fiber, each described transition optical fiber and described the second optical fiber is monotone sequence of numbers; And the mode field diameter of described the first optical fiber, each described transition optical fiber and described the second optical fiber is monotone sequence of numbers.
6. according to the arbitrary described optical fiber of claim 1 to 5, it is characterized in that, the numerical aperture of described transition optical fiber is between the numerical aperture of described the first optical fiber and the numerical aperture of described the second optical fiber, and the mode field diameter of described transition optical fiber is between the mode field diameter of described the first optical fiber and the mode field diameter of described the second optical fiber.
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| CN201520938067.XU CN205263347U (en) | 2015-11-23 | 2015-11-23 | Optic fibre that match optic fibre mould field |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107834352A (en) * | 2017-10-31 | 2018-03-23 | 大族激光科技产业集团股份有限公司 | Optical fiber mode fields matching process |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107834352A (en) * | 2017-10-31 | 2018-03-23 | 大族激光科技产业集团股份有限公司 | Optical fiber mode fields matching process |
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Address after: 518000 Guangdong Province, Shenzhen city Longhua District Guanlan Street No. 5 Wu Lu Sheng Keng community view science and Technology Building No. 1 South and west of the factory floor Patentee after: SHENZHEN JPT OPTO-ELECTRONICS CO., LTD. Address before: 518000 Guangdong Province, Shenzhen city Longhua District Guanlan Street No. 5 Wu Lu Sheng Keng community view science and Technology Building No. 1 South and west of the factory floor Patentee before: Shenzhen Jpt Electronics Co., Ltd. |