CN217506180U - Light guide fiber - Google Patents
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- CN217506180U CN217506180U CN202220207478.1U CN202220207478U CN217506180U CN 217506180 U CN217506180 U CN 217506180U CN 202220207478 U CN202220207478 U CN 202220207478U CN 217506180 U CN217506180 U CN 217506180U
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Abstract
The application relates to a guidance optic fibre, it includes sandwich layer, inner cladding, the cladding that caves in, surrounding layer, undercoating and external coating, the inner cladding is located the sandwich layer outside, the cladding that caves in is located the inner cladding outside, the surrounding layer is located the cladding outside that caves in, the undercoating is located the surrounding layer outside, the external coating is located the undercoating outside, the sandwich layer is germanium-doped silica, the inner cladding is fluorine germanium silica that codoped. According to the guiding optical fiber, the inner cladding layer doped with germanium/fluorine is arranged on the periphery of the core layer, so that the viscosity of the guiding optical fiber can be effectively reduced, the attenuation increase caused by overlarge interface stress is reduced, and the guiding optical fiber has good attenuation characteristics.
Description
Technical Field
The application relates to the technical field of communication transmission, in particular to a guidance optical fiber.
Background
Optical fiber as a transmission medium has the advantages of low loss, small volume, light weight, electromagnetic interference resistance and the like, is widely applied to the modern optical fiber communication technology, and is also valued and favored by military in various developed countries. The optical fiber guided weapon system is an advanced wired guided weapon system, adopts optical fibers as a data transmission link, bidirectionally transmits signals between a weapon and a launching platform, enables missiles to accurately strike enemy targets, is an indispensable key component for guided information transmission in the optical fiber guided weapon system, and directly determines the range, the running speed and the reliability of the optical fiber guided weapon system through the performance of the optical fiber guided weapon system.
Modern guided optical fibers require high strength, miniaturization, long distances, and good attenuation and bend resistance characteristics. The optical fiber needs to be used in a cable at the later stage, and a guidance optical fiber needs to be optimized on the aspect of optical fiber design so as to meet the performance requirements.
Disclosure of Invention
The embodiment of the application provides a guidance optical fiber, and the germanium/fluorine-doped inner cladding layer is arranged on the periphery of the core layer, so that the viscosity of the guidance optical fiber can be effectively reduced, the attenuation increase caused by overlarge interface stress is reduced, and the guidance optical fiber has good attenuation characteristics.
The embodiment of the application provides a guidance optical fiber, which comprises a core layer, an inner cladding layer, a sunken cladding layer, an outer cladding layer, an inner coating layer and an outer coating layer;
the inner cladding layer is positioned outside the core layer;
the sunken cladding layer is positioned outside the inner cladding layer;
the outer cladding layer is positioned outside the sunken cladding layer;
the inner coating is positioned outside the outer coating;
the outer coating is positioned outside the inner coating;
the core layer is silicon dioxide doped with germanium, and the inner cladding layer is silicon dioxide doped with fluorine and germanium.
In some embodiments, the relative refractive index difference Δ 1 of the core layer is between 0.4% and 0.6%, the relative refractive index difference Δ 2 of the inner cladding layer is between-0.1% and 0.1%, and the relative refractive index difference Δ 3 of the depressed cladding layer is between-0.8% and-0.5%.
In some embodiments, the depressed cladding is fluorine doped silica and the outer cladding is pure silica glass.
In some embodiments, the core layer has a diameter D1 of 6.0 μm to 8.0 μm, the inner cladding has a diameter D2 of 25 μm to 35 μm, the depressed cladding has a diameter D3 of 45 μm to 55 μm, the outer cladding has a diameter D4 of 90 μm to 110 μm, the inner cladding has a diameter of 140 μm to 160 μm, and the outer cladding has a diameter of 180 μm to 220 μm.
In some embodiments, the young's modulus of the inner coating is between 50Mpa and 150Mpa and the young's modulus of the outer coating is between 1600Mpa and 2200 Mpa.
In some embodiments, the guidance fiber has a screening strength greater than 100 kpsi.
In some embodiments, the guidance fiber has an additional loss of no more than 0.5dB at a bend radius of 5mm x 10 turns.
In some embodiments, the guidance fiber has an additional loss of no more than 0.1dB at a bend radius of 15mm x 10 turns.
In some embodiments, the guided optical fiber has an operating wavelength of 1310nm and 1550 nm.
In some embodiments, the guided optical fiber has a transmission loss of 0.39dB/km or less at an operating wavelength of 1310 nm;
and under the condition that the working wavelength is 1310nm, the transmission loss of the guide optical fiber is less than or equal to 0.22 dB/km.
The technical scheme who provides this application brings beneficial effect includes:
the embodiment of the application provides a guidance optical fiber, and the germanium/fluorine-doped inner cladding layer is arranged on the periphery of the core layer, so that the viscosity of the guidance optical fiber can be effectively reduced, the attenuation increase caused by overlarge interface stress is reduced, and the guidance optical fiber has good attenuation characteristics.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic view of a radial cross-section structure of a guidance fiber provided in an embodiment of the present application;
FIG. 2 is a cross-sectional view of the refractive index of a guiding optical fiber according to an embodiment of the present application.
In the figure: 1. a core layer; 2. an inner cladding; 3. a depressed cladding layer; 4. an outer cladding; 5. inner coating; 6. and (4) an outer coating.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Referring to fig. 1, the embodiment of the present application provides a guiding optical fiber including a core layer 1, an inner cladding layer 2, a depressed cladding layer 3, an outer cladding layer 4, an inner coating layer 5, and an outer coating layer 6; inner cladding 2 is located the 1 outside of sandwich layer, sunken cladding 3 is located the 2 outsides of inner cladding, outer cladding 4 is located the 3 outsides of sunken cladding, inner coating 5 is located the 4 outsides of outer cladding, outer coating 6 is located the 5 outsides of inner coating, sandwich layer 1 is germanium-doped silica, inner cladding 2 is fluorine germanium-codoped silica. The sunken cladding layer 3 is fluorine-doped silica, and the outer cladding layer 4 is pure silica glass.
The embodiment of the application provides a guidance optical fiber, and the germanium/fluorine-doped inner cladding layer is arranged on the periphery of the core layer, so that the viscosity of the guidance optical fiber can be effectively reduced, the attenuation increase caused by overlarge interface stress is reduced, and the guidance optical fiber has good attenuation characteristics.
In some preferred embodiments, the relative refractive index difference Δ 1 of the core layer 1 is 0.4% to 0.6%, the relative refractive index difference Δ 2 of the inner cladding layer 2 is-0.1% to 0.1%, and the relative refractive index difference Δ 3 of the depressed cladding layer 3 is-0.8% to-0.5%.
In the embodiment, the relative refractive index difference of the core layer 1 of the guide optical fiber is increased but not obviously increased compared with the conventional guide communication optical fiber, so that the adverse effect of germanium doping of the core layer 1 on attenuation is reduced.
Referring to FIG. 2, in some preferred embodiments, the core layer 1 has a diameter D1 of 6.0 μm to 8.0 μm, the inner cladding layer 2 has a diameter D2 of 25 μm to 35 μm, the depressed cladding layer 3 has a diameter D3 of 45 μm to 55 μm, the outer cladding layer 4 has a diameter D4 of 90 μm to 110 μm, the inner coating layer 5 has a diameter of 140 μm to 160 μm, and the outer coating layer 6 has a diameter of 180 μm to 220 μm.
The size of the outer cladding layer 4 of the guided optical fiber is smaller than that of a conventional guided communication optical fiber, the relative refractive index difference of the core layer 1 is larger than that of the conventional guided communication optical fiber, and meanwhile, the guided optical fiber has good bending resistance due to the adoption of the surrounding sunken cladding structure. The diameter of the outer coating of the guiding optical fiber is smaller than that of the conventional guiding communication optical fiber, and the guiding optical fiber is more suitable for the miniaturization preparation of the guiding optical cable.
The guide optical fiber has operating wavelengths of 1310nm and 1550 nm.
And under the condition that the working wavelength is 1310nm, the transmission loss of the guide optical fiber is less than or equal to 0.39 dB/km.
And under the condition that the working wavelength is 1310nm, the transmission loss of the guide optical fiber is less than or equal to 0.22 dB/km.
The additional loss of the guiding fiber is not more than 0.5dB under the condition of bending radius of 5mm by 10 circles.
The additional loss of the guiding fiber is not more than 0.1dB at a bending radius of 15mm by 10 turns.
In some preferred embodiments, the Young's modulus of the inner coating 5 is 50MPa to 150MPa, and the Young's modulus of the outer coating 6 is 1600MPa to 2200 MPa.
The elastic modulus of the coating material of the guiding optical fiber is different from that of the conventional guiding communication optical fiber, so that the guiding optical fiber has good screening strength. Specifically, the screening strength of the guiding optical fiber is greater than 100kpsi, and can reach 200 kpsi.
The present application will be described in detail below with reference to several specific examples.
The first embodiment is as follows:
the utility model provides a guidance optical fiber, it includes sandwich layer 1, inner cladding 2, the cladding 3 that caves in, outer cladding 4, inner coating 5 and external coating 6, inner cladding 2 is located the sandwich layer 1 outside, and the cladding 3 that caves in is located the inner cladding 2 outside, and outer cladding 4 is located the cladding 3 outside that caves in, and inner coating 5 is located the outer cladding 4 outside, and external coating 6 is located the inner coating 5 outside, and sandwich layer 1 is germanium-doped silica, and inner cladding 2 is fluorine germanium codoped silica.
Geometric dimension aspect: the diameter D1 of the core layer 1 was controlled to be 6 μm, the diameter D2 of the inner cladding 2 was controlled to be 25 μm, the diameter D3 of the depressed cladding 3 was controlled to be 45 μm, the diameter D4 of the outer cladding 4 was controlled to be 90 μm, the diameter of the inner cladding 5 was controlled to be 140 μm, and the diameter of the outer cladding 6 was controlled to be 180 μm.
Refractive index aspect: the relative refractive index difference delta 1 of the core layer 1 is controlled to be 0.4 percent, the refractive index difference delta 2 of the inner cladding layer 2 is controlled to be-0.1 percent, and the relative refractive index difference delta 3 of the depressed cladding layer 3 is controlled to be-0.8 percent.
Aspect of elastic modulus of coating: the Young's modulus of the inner coating 5 is controlled to be 50Mpa, and the Young's modulus of the outer coating 6 is controlled to be 1500 Mpa.
The main parameters and the bending variations of the drawn guiding fiber are shown in Table 1.
Table 1: data results of example 1
Example two:
the utility model provides a guidance optical fiber, it includes sandwich layer 1, inner cladding 2, the cladding 3 that caves in, outer cladding 4, inner coating 5 and external coating 6, inner cladding 2 is located the sandwich layer 1 outside, and the cladding 3 that caves in is located the inner cladding 2 outside, and outer cladding 4 is located the cladding 3 outside that caves in, and inner coating 5 is located the outer cladding 4 outside, and external coating 6 is located the inner coating 5 outside, and sandwich layer 1 is germanium-doped silica, and inner cladding 2 is fluorine germanium codoped silica.
Geometric dimension aspect: the diameter D1 of the core layer 1 was controlled to be 7 μm, the diameter D2 of the inner cladding 2 was controlled to be 30 μm, the diameter D3 of the depressed cladding 3 was controlled to be 50 μm, the diameter D4 of the outer cladding 4 was controlled to be 100 μm, the diameter of the inner cladding 5 was controlled to be 150 μm, and the diameter of the outer cladding 6 was controlled to be 200 μm.
Refractive index aspect: the relative refractive index difference Δ 1 of the core layer 1 was controlled to be 0.5%, the refractive index difference Δ 2 of the inner cladding layer 2 was controlled to be 0%, and the relative refractive index difference Δ 3 of the depressed cladding layer 3 was controlled to be-0.65%.
Aspect of elastic modulus of coating: the Young's modulus of the inner coating 5 is controlled to be 100Mpa, and the Young's modulus of the outer coating 6 is controlled to be 1900 Mpa.
The main parameters and the bending changes of the drawn guided optical fiber are shown in Table 2.
Table 2: example 2 data results
Example three:
the utility model provides a guidance optical fiber, it includes sandwich layer 1, inner cladding 2, the cladding 3 that caves in, outer cladding 4, inner coating 5 and external coating 6, inner cladding 2 is located the sandwich layer 1 outside, and the cladding 3 that caves in is located the inner cladding 2 outside, and outer cladding 4 is located the cladding 3 outside that caves in, and inner coating 5 is located the outer cladding 4 outside, and external coating 6 is located the inner coating 5 outside, and sandwich layer 1 is germanium-doped silica, and inner cladding 2 is fluorine germanium codoped silica.
Geometric dimension aspect: the diameter D1 of the core layer 1 was controlled to be 8 μm, the diameter D2 of the inner cladding 2 was controlled to be 35 μm, the diameter D3 of the depressed cladding 3 was controlled to be 55 μm, the diameter D4 of the outer cladding 4 was controlled to be 110 μm, the diameter D5 of the inner coating 5 was controlled to be 160 μm, and the diameter D6 of the outer coating 6 was controlled to be 220 μm.
Refractive index aspect: the relative refractive index difference delta 1 of the core layer 1 is controlled to be 0.6%, the refractive index difference delta 2 of the inner cladding layer 2 is controlled to be 0.1%, and the relative refractive index difference delta 3 of the depressed cladding layer 3 is controlled to be-0.5%.
Aspect of elastic modulus of coating: the Young modulus of the inner coating 5 is controlled to be 150MPa, and the Young modulus of the outer coating 6 is controlled to be 2200 MPa.
The main parameters and the bending variations of the drawn guide fiber are shown in Table 3.
Table 3: example 3 data results
Example four:
a guidance optical fiber comprises a core layer 1, an inner cladding layer 2, a sunken cladding layer 3, an outer cladding layer 4, an inner cladding layer 5 and an outer coating layer 6, wherein the inner cladding layer 2 is positioned on the outer side of the core layer 1, the sunken cladding layer 3 is positioned on the outer side of the inner cladding layer 2, the outer cladding layer 4 is positioned on the outer side of the sunken cladding layer 3, the inner cladding layer 5 is positioned on the outer side of the outer cladding layer 4, the outer coating layer 6 is positioned on the outer side of the inner cladding layer 5, the core layer 1 is silicon dioxide doped with germanium, and the inner cladding layer 2 is silicon dioxide doped with fluorine and germanium.
Geometric dimension aspect: the diameter D1 of the core layer 1 was controlled to be 6.5 μm, the diameter D2 of the inner cladding 2 was controlled to be 28 μm, the diameter D3 of the depressed cladding 3 was controlled to be 48 μm, the diameter D4 of the outer cladding 4 was controlled to be 95 μm, the diameter D5 of the inner cladding 5 was controlled to be 145 μm, and the diameter D6 of the outer cladding 6 was controlled to be 185 μm.
Refractive index aspect: the relative refractive index difference delta 1 of the core layer 1 is controlled to be 0.5%, the refractive index difference delta 2 of the inner cladding layer 2 is controlled to be 0.1%, and the relative refractive index difference delta 3 of the depressed cladding layer 3 is controlled to be-0.6%.
Aspect of elastic modulus of coating: the Young's modulus of the inner coating 5 is controlled to be 120MPa, and the Young's modulus of the outer coating 6 is controlled to be 2000 MPa.
The main parameters and the bending variations of the drawn guide fiber are shown in Table 4.
Table 4: example 4 data results
Example five:
the utility model provides a guidance optical fiber, it includes sandwich layer 1, inner cladding 2, the cladding 3 that caves in, outer cladding 4, inner coating 5 and external coating 6, inner cladding 2 is located the sandwich layer 1 outside, and the cladding 3 that caves in is located the inner cladding 2 outside, and outer cladding 4 is located the cladding 3 outside that caves in, and inner coating 5 is located the outer cladding 4 outside, and external coating 6 is located the inner coating 5 outside, and sandwich layer 1 is germanium-doped silica, and inner cladding 2 is fluorine germanium codoped silica.
Geometric dimension aspect: the diameter D1 of the control core layer 1 is 7.5 μm, the diameter D2 of the inner cladding 2 is 32 μm, the diameter D3 of the depressed cladding 3 is 52 μm, the diameter D4 of the outer cladding 4 is 105 μm, the diameter D5 of the inner cladding 5 is 155 μm, and the diameter D6 of the outer cladding 6 is 195 μm.
Refractive index aspect: the relative refractive index difference Δ 1 of the core layer 1 was controlled to be 0.55%, the refractive index difference Δ 2 of the inner cladding layer 2 was controlled to be 0.1%, and the relative refractive index difference Δ 3 of the depressed cladding layer 3 was controlled to be-0.65%.
Aspect of elastic modulus of coating: the Young's modulus of the inner coating 5 is controlled to be 70MPa, and the Young's modulus of the outer coating 6 is controlled to be 1700 MPa.
The main parameters and the bending variations of the drawn guide fiber are shown in Table 5.
Table 5: example 5 data results
Example six:
the utility model provides a guidance optical fiber, it includes sandwich layer 1, inner cladding 2, the cladding 3 that caves in, outer cladding 4, inner coating 5 and external coating 6, inner cladding 2 is located the sandwich layer 1 outside, and the cladding 3 that caves in is located the inner cladding 2 outside, and outer cladding 4 is located the cladding 3 outside that caves in, and inner coating 5 is located the outer cladding 4 outside, and external coating 6 is located the inner coating 5 outside, and sandwich layer 1 is germanium-doped silica, and inner cladding 2 is fluorine germanium codoped silica.
Geometric dimension aspect: the diameter D1 of the core layer 1 was controlled to be 6.2 μm, the diameter D2 of the inner cladding 2 was controlled to be 29 μm, the diameter D3 of the depressed cladding 3 was controlled to be 51 μm, the diameter D4 of the outer cladding 4 was controlled to be 102 μm, the diameter D5 of the inner coating 5 was controlled to be 155 μm, and the diameter D6 of the outer coating 6 was controlled to be 210 μm.
Refractive index aspect: the relative refractive index difference delta 1 of the core layer 1 is controlled to be 0.45%, the refractive index difference delta 2 of the inner cladding layer 2 is controlled to be 0.1%, and the relative refractive index difference delta 3 of the depressed cladding layer 3 is controlled to be-0.55%.
Aspect of elastic modulus of coating: the Young's modulus of the inner coating 5 is controlled to be 70MPa, and the Young's modulus of the outer coating 6 is controlled to be 1800 MPa.
The main parameters and the bending variations of the drawn guide fiber are shown in Table 6.
Table 6: example 6 data results
In the description of the present application, it should be noted that the terms "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are only for convenience in describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and operate, and thus, should not be construed as limiting the present application. Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "coupled" are to be construed broadly and encompass, for example, both fixed and removable coupling as well as integral coupling; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
It is noted that, in the present application, relational terms such as "first" and "second", and the like, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The previous description is only an example of the present application, and is provided to enable any person skilled in the art to understand or implement the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A guidance fiber, characterized by: the composite material comprises a core layer (1), an inner cladding layer (2), a sunken cladding layer (3), an outer cladding layer (4), an inner coating layer (5) and an outer coating layer (6);
the inner cladding (2) is positioned outside the core layer (1);
the sunken cladding (3) is positioned outside the inner cladding (2);
the outer cladding (4) is positioned outside the depressed cladding (3);
the inner coating (5) is positioned outside the outer coating (4);
the outer coating (6) is positioned outside the inner coating (5);
the core layer (1) is silicon dioxide doped with germanium, and the inner cladding layer (2) is silicon dioxide doped with fluorine and germanium.
2. The guidance fiber of claim 1, wherein: the relative refractive index difference delta 1 of the core layer (1) is 0.4% -0.6%, the relative refractive index difference delta 2 of the inner cladding layer (2) is-0.1%, and the relative refractive index difference delta 3 of the sunken cladding layer (3) is-0.8% -0.5%.
3. The guided optical fiber of claim 1 wherein: the sunken cladding layer (3) is fluorine-doped silica, and the outer cladding layer (4) is pure silica glass.
4. The guidance fiber of claim 1, wherein: the diameter D1 of the core layer (1) is 6.0-8.0 μm, the diameter D2 of the inner cladding (2) is 25-35 μm, the diameter D3 of the sunken cladding (3) is 45-55 μm, the diameter D4 of the outer cladding (4) is 90-110 μm, the diameter of the inner coating (5) is 140-160 μm, and the diameter of the outer coating (6) is 180-220 μm.
5. The guided optical fiber of claim 1 wherein: the Young modulus of the inner coating (5) is 50-150 Mpa, and the Young modulus of the outer coating (6) is 1600-2200 Mpa.
6. The guidance fiber of claim 5, wherein: the screening strength of the guiding optical fiber is more than 100 kpsi.
7. The guidance fiber of claim 1, wherein: the additional loss of the guiding fiber is not more than 0.5dB under the condition of bending radius of 5mm by 10 circles.
8. The guidance fiber of claim 1, wherein: the additional loss of the guiding fiber is not more than 0.1dB under the condition of 15mm by 10 turns of bending radius.
9. The guidance fiber of claim 1, wherein: the guide optical fiber has operating wavelengths of 1310nm and 1550 nm.
10. The guidance fiber of claim 9, wherein:
under the condition that the working wavelength is 1310nm, the transmission loss of the guide optical fiber is less than or equal to 0.39 dB/km;
and under the condition that the working wavelength is 1310nm, the transmission loss of the guide optical fiber is less than or equal to 0.22 dB/km.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116577866A (en) * | 2023-07-14 | 2023-08-11 | 江苏永鼎股份有限公司 | Low-loss bending insensitive optical fiber and jumper wire |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116577866A (en) * | 2023-07-14 | 2023-08-11 | 江苏永鼎股份有限公司 | Low-loss bending insensitive optical fiber and jumper wire |
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