CN113703096A - Preparation method of novel surface-mounted type tight-sleeve multimode fiber reflector - Google Patents
Preparation method of novel surface-mounted type tight-sleeve multimode fiber reflector Download PDFInfo
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- 238000002360 preparation method Methods 0.000 title claims abstract description 14
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- 239000000853 adhesive Substances 0.000 claims abstract description 32
- 230000001070 adhesive effect Effects 0.000 claims abstract description 32
- 238000000227 grinding Methods 0.000 claims abstract description 24
- 239000003292 glue Substances 0.000 claims abstract description 17
- 238000004519 manufacturing process Methods 0.000 claims abstract description 14
- 239000011521 glass Substances 0.000 claims abstract description 13
- 229920006332 epoxy adhesive Polymers 0.000 claims abstract description 12
- 229910001220 stainless steel Inorganic materials 0.000 claims abstract description 11
- 239000010935 stainless steel Substances 0.000 claims abstract description 11
- 239000003822 epoxy resin Substances 0.000 claims abstract description 10
- 238000005498 polishing Methods 0.000 claims abstract description 10
- 229920000647 polyepoxide Polymers 0.000 claims abstract description 10
- 239000011247 coating layer Substances 0.000 claims abstract description 8
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- 238000007598 dipping method Methods 0.000 claims abstract description 4
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- 229910003460 diamond Inorganic materials 0.000 claims description 15
- 239000012788 optical film Substances 0.000 claims description 8
- 239000006061 abrasive grain Substances 0.000 claims description 7
- 238000007747 plating Methods 0.000 claims description 4
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- 230000003287 optical effect Effects 0.000 abstract description 27
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- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 10
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- 235000012239 silicon dioxide Nutrition 0.000 description 4
- MCMNRKCIXSYSNV-UHFFFAOYSA-N ZrO2 Inorganic materials O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 3
- 239000003082 abrasive agent Substances 0.000 description 3
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- 230000003746 surface roughness Effects 0.000 description 2
- PBCFLUZVCVVTBY-UHFFFAOYSA-N tantalum pentoxide Inorganic materials O=[Ta](=O)O[Ta](=O)=O PBCFLUZVCVVTBY-UHFFFAOYSA-N 0.000 description 2
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- 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
- G02B6/24—Coupling light guides
- G02B6/26—Optical coupling means
- G02B6/264—Optical coupling means with optical elements between opposed fibre ends which perform a function other than beam splitting
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- 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
- G02B6/24—Coupling light guides
- G02B6/25—Preparing the ends of light guides for coupling, e.g. cutting
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Abstract
The invention discloses a preparation method of a novel patch type tight-sleeve multimode fiber reflector, which comprises the following steps: peeling off a coating layer with a preset length and an optical fiber section of the tight sleeve from the optical fiber with the tight sleeve, peeling off the coating layer and the optical fiber section of the tight sleeve, dipping an epoxy adhesive, penetrating the epoxy adhesive into the ceramic ferrule, and heating to cure the epoxy adhesive so as to firmly bond the optical fiber and the ceramic ferrule through epoxy resin adhesive; removing part of the optical fiber protruding out of one end of the ceramic ferrule, and placing the optical fiber and the end face of the ceramic ferrule on an end face grinding machine for grinding and polishing; bonding the K9 glass film-coated membrane to the end faces of the optical fiber and the ceramic ferrule by using an adhesive to obtain an optical fiber assembly; the optical fiber assembly is arranged in the stainless steel tube shell through epoxy resin glue. The invention avoids the film layer crack generated when optical coating is carried out on the end surface composed of different materials, and realizes the high-reliability and high-quality production of the optical fiber reflector based on the deep hole ceramic packaging structure.
Description
Technical Field
The invention belongs to the technical field of dielectric film optical fiber reflector manufacturing, and particularly relates to a method for manufacturing a novel patch type tight-sleeve multimode optical fiber reflector.
Background
The optical fiber reflector is a passive device for realizing light reflection in an optical path, realizes light reflection in an optical fiber, and often cracks occur at a joint of the optical fiber and the ferrule when the ferrule and the end face of the optical fiber are coated with a film because the coated end face is composed of three components, namely the ferrule, the optical fiber, adhesive glue and the like, and the three components have different thermal expansion coefficients, wherein the thermal expansion coefficient of the adhesive glue is the largest, so that the end face film layer is cracked due to deformation stress of a reflecting film of the end face under the temperature change, and the film layer is further peeled off.
Disclosure of Invention
The technical problem solved by the invention is as follows: the method overcomes the defects of the prior art, provides a method for preparing a novel patch type tight-sleeve multimode fiber reflector, avoids film cracks generated during optical coating on end faces made of different materials, and can realize high-reliability and high-quality production of the fiber reflector based on a deep-hole ceramic packaging structure.
The purpose of the invention is realized by the following technical scheme: a method for preparing a novel patch type tight sleeve multimode fiber reflector comprises the following steps: the method comprises the following steps: peeling off a coating layer with a preset length and an optical fiber section of the tight sleeve from the optical fiber with the tight sleeve, peeling off the coating layer and the optical fiber section of the tight sleeve, dipping an epoxy adhesive, penetrating the epoxy adhesive into the ceramic ferrule, and heating to cure the epoxy adhesive so as to firmly bond the optical fiber and the ceramic ferrule through epoxy resin adhesive; step two: removing part of the optical fiber protruding out of one end of the ceramic ferrule, and placing the optical fiber and the end face of the ceramic ferrule on an end face grinding machine for grinding and polishing; step three: bonding the K9 glass film-coated membrane to the end faces of the optical fiber and the ceramic ferrule by using an adhesive to obtain an optical fiber assembly; step four: arranging the optical fiber assembly in the stainless steel tube shell through epoxy resin glue; step five: and fixing the optical fiber and the stainless steel tube shell together by using tail fiber protective silicon rubber at the sealing opening of the stainless steel tube shell.
In the preparation method of the novel patch type tight-sleeve multimode fiber reflector, in the step one, the length of the optical fiber is 6 meters.
In the preparation method of the novel patch type tight-sleeve multimode fiber reflector, in the step one, the preset length is 1 cm.
In the preparation method of the novel patch type tight-sleeve multimode fiber reflector, in the third step, the K9 glass film-coated membrane is obtained by the following method: an optical film is plated on one surface of K9 glass with the size of 0.7mm x 0.7mm by adopting an optical film plating mode.
In the preparation method of the novel patch type tight-sleeve multimode fiber reflector, in the second step, when grinding and polishing processing are carried out, the cutting depth of the abrasive particle size of the grinding machine is smaller than the critical cutting depth of the optical fiber.
In the preparation method of the novel patch type tight-sleeve multimode fiber reflector, the critical cutting depth of the optical fiber is obtained by the following formula:
wherein d iscIs the critical depth of cut of the optical fiber, EfIs the modulus of elasticity, HV, of an optical fiberfIs the Vickers microhardness, K, of an optical fiberICIs the fracture toughness of the optical fiber.
In the preparation method of the novel patch type tight sleeve multimode fiber reflector, the grinding material of the grinding machine is diamond grinding material.
According to the preparation method of the novel patch type tight sleeve multimode fiber reflector, when the granularity of diamond abrasive is smaller than 20 micrometers, the abrasive is regarded as a sphere, and the cutting depth of single diamond abrasive grain is obtained by applying the Hertz contact theory.
In the preparation method of the novel patch type tight sleeve multimode fiber reflector, the cutting depth of a single diamond abrasive particle is obtained by the following formula:
wherein, KaAs abrasive concentration, KpTo grind the pressure coefficient, DaTo an abrasive particle size, E*Is equivalent elastic modulus, HV'fIs the vickers microhardness of the abrasive.
In the preparation method of the novel patch type tight sleeve multimode fiber reflector, the equivalent elastic modulus E*Obtained by the following formula:
wherein E isaIs the elastic modulus, v, of the abrasivefIs the Poisson's ratio, v, of the optical fiberaIs the poisson's ratio of the abrasive.
Compared with the prior art, the invention has the following beneficial effects:
(1) the invention replaces the mode of coating the film on the end face of the ceramic ferrule by the mode of bonding the optical coated lens on the end face of the ceramic ferrule, and the contact surface of the film layer is changed into an adhesive from the surface consisting of the end face of the ceramic ferrule, epoxy resin glue and the end face of the optical fiber, thereby avoiding the film layer crack caused by the temperature change of the end face coating film;
(2) according to the invention, the cutting depth of the abrasive particle size of the grinder is smaller than the critical cutting depth of the optical fiber, and the abrasive particle size can be removed in a plastic flow mode, so that a machined surface with higher surface quality can be obtained;
(3) in the process of bonding the lens, the coating position of the adhesive is controlled to ensure that the adhesive does not contact the end face of the optical fiber, so that the loss caused by light transmission in the adhesive is reduced, and the reflectivity of the optical fiber reflector is improved;
(4) in the process of bonding the lens, the adhesive is uniformly coated on the end faces of the lens and the ceramic ferrule by controlling the coating position of the adhesive, so that the distances between the lens and the end face of the ceramic ferrule are equal, and the inclination of the lens under the temperature change is reduced, thereby reducing the change of the reflectivity of the optical fiber reflector under the temperature change;
(5) when the lens is adhered, the optical fiber coupler is utilized, the end 1 is connected with the light source, the end 2 is connected with the power meter, the end 3 is connected with the optical fiber reflector to be adhered, and the end 4 is subjected to light limiting treatment. The reflection power of the optical fiber reflector is detected in real time in a light passing mode in the tail fiber of the optical fiber reflector, and the position of the lens during bonding is represented by the reflectivity of the optical fiber reflector.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
FIG. 1 is a schematic structural diagram of a bonded-lens multimode fiber optic mirror according to an embodiment of the present invention;
FIG. 2 is an optical diagram of a real-time detection of the reflectivity of a fiber optic mirror when the mirror is bonded according to an embodiment of the present invention;
FIG. 3 is a schematic representation of the reflection and transmission at the interface of a single dielectric film according to an embodiment of the present invention;
FIG. 4 is a graph showing the relationship between the reflectivity and the optical thickness of a single dielectric film according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of the optical path difference caused by the light reflection from the rough surface according to the embodiment of the present invention;
FIG. 6 is a flow chart of the optical fiber end face polishing process provided by an embodiment of the present invention;
fig. 7 is a graph showing the relationship between the reflectivity of the mirror plate and the wavelength according to the embodiment of the present invention.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
FIG. 1 is a schematic structural diagram of a bonded-lens multimode fiber mirror according to an embodiment of the present invention. The embodiment provides a preparation method of a novel patch type tight-sleeve multimode fiber reflector, which comprises the following steps:
the method comprises the following steps: stripping a coating layer and a tight sleeve with the length of 1cm from a section of optical fiber with the length of 6 meters and the tight sleeve, dipping the optical fiber with the stripped coating layer with an epoxy adhesive, penetrating the optical fiber into the ceramic ferrule, and heating to cure the epoxy adhesive so that the optical fiber ceramic ferrule is firmly bonded through the epoxy adhesive;
step two: and (3) removing the optical fiber protruding out of one end of the ceramic ferrule from the assembly formed by bonding the optical fiber and the ceramic ferrule, and then placing the end faces of the optical fiber and the ceramic ferrule on an end face grinding machine for grinding and polishing.
Step three: plating an optical film on the end faces of the ceramic ferrule and the optical fiber in an optical film plating mode on K9 glass with a certain thickness of 0.7mm x 0.7 mm;
step four: adhering the K9 glass plated with the optical film to the end faces of the optical fiber and the ceramic ferrule by using an adhesive, and paying attention to the fact that one face of the optical film is in butt joint with the end face of the ceramic ferrule;
step five: coating the optical fiber assembly bonded with the K9 glass coated membrane around the ceramic ferrule by using epoxy resin glue, and then putting the optical fiber assembly into a stainless steel tube shell to ensure that the tube shell and the ceramic ferrule are firmly bonded by the epoxy resin glue;
step six: and fixing the optical fiber and the stainless steel tube shell together by using tail fiber protective silicon rubber at the sealing opening of the stainless steel tube shell.
Aiming at the problem that the end face coating of the optical fiber and the ceramic ferrule is easy to cause annular cracks under the temperature change, the invention adopts a mode of bonding the lens to replace the end face coating, thereby avoiding the film layer from generating cracks.
As shown in fig. 1, the patch type tight-sleeved optical fiber reflector of the present invention includes an optical fiber, a binder 1, a ceramic ferrule, a reflector, a binder 2, a stainless steel tube shell, and a pigtail protection glue. The optical fiber is adhered and fixed on the ceramic ferrule through an adhesive 1; the reflecting mirror is directly bonded on the end faces of the optical fiber and the ceramic inserting core through the adhesive 3. During bonding, the optical path shown in fig. 2 is used, the reading of the optical power meter CH1 in fig. 2 is detected in real time, and when the lens reading is at the maximum, the adhesive 3 is cured by ultraviolet exposure. The coating position of the adhesive 3 is controlled, so that the adhesive 3 cannot flow into a transmission path between the lens and the optical fiber, the optical path loss can be ensured to be minimum, and the reflectivity of the optical fiber reflector is ensured to be high; the two adhesives 3 are uniformly coated on the periphery of the lens, so that the angle between the lens and the ceramic ferrule is unchanged along with the thermal expansion of the adhesive 1 under the temperature change, and the minimum reflectivity variation of the optical fiber reflector can be ensured.
After the optical fiber ceramic ferrule lens assembly is made, the tube shell and the assembly are bonded together by using a bonding agent 2, and then root protection glue is coated on the root of the ceramic ferrule.
The invention is manufactured based on the dielectric film optical fiber reflector principle. The principle of dielectric film optical fiber reflector is based on multi-beam interference, and the simplest multilayer reflection is formed by alternately evaporating two materials with high and low refractive indexes, and the optical thickness of each layer is 1/4 of a certain wavelength. Under this condition, the reflected light vectors at the interfaces of the multilayer dielectric film have the same vibration direction. The composite amplitude increases with the number of layers of the film, but the reflectance cannot be increased any more when the number of layers of the film system reaches a certain level due to absorption and scattering losses in the film layers. The general dielectric film adopts tantalum pentoxide (Ta2O5) and silicon dioxide (SiO2) as coating materials, can also use titanium pentoxide (Ti3O5) and silicon dioxide (SiO2), and can be designed into a broadband or narrowband reflecting film according to requirements.
First, the optical characteristics of the single-layer dielectric film were described, and assuming that the amplitude of the incident light was 1, as shown in FIG. 3, the amplitude of the reflected light 1 formed by reflection at the interface n0 to n1 was r01, and the transmitted light was t01, and the reflected light 2 formed by reflection at the interface n1 to ns and transmission at the interface n1 to n0 was t01r12t10, the other reflected lights 3, 4, …, and,m has an amplitude of t01r212t10、t01r312t210、t01r412t310…、t01rm-312tm-210, etc. Comparing reflected light 1 with reflected light 2, the phase difference between any two adjacent reflected lights due to the optical path difference is:
wherein: is the wavelength of light in vacuum, and is the angle of refraction.
Since the light waves are coherent, their sum amplitude after superposition is
The single layer film has a reflectance of
By substituting the corresponding Fresnel coefficient into the above formula, the reflectivity of the single-layer film can be written as
When the optical thickness of the single-layer dielectric film is, k is odd number, the reflectivity of the single-layer film is
The reflectance of a single dielectric film as a function of its optical thickness is shown in figure 4. Obviously, when the reflectivity has a maximum value, there is an adverse effect.
The optical performance technical indexes of the optical fiber reflector comprise: center wavelength, optical bandwidth, reflectivity. These criteria are determined by the dielectric film, wherein the level of reflectivity is also related to the angle of the fiber polish.
Influence of fiber end face roughness on light reflection:
when the end face of the optical fiber of the reflector is not flat and smooth, the light incident on the surface of the optical fiber is reflected by the rough surface of the optical fiber, which causes an optical path difference and affects the stability of the optical fiber transmission system. In order to avoid the diffuse reflection of the incident light on the surface of the optical fiber, which has a strict requirement on the surface roughness, the rough surface is simplified into a fine step surface as shown in fig. 5, two beams of parallel light a and b are incident on the rough surface of the optical fiber from the air and reach A, C points at the same time, the incident angle is θ, and the reflection angle is equal to the incident angle. The optical path of the light beam a is AB, the optical path of the light beam b is CO + OB, and the optical path difference delta of the two light beams a and b is:
from the basic theory of optics, it is known that to avoid diffuse reflection, the optical path difference must not exceed one eighth of the wavelength of light, i.e. the wavelength of light
In the formula: Δ — optical path difference, nm;
h-step height, nm;
λ -wavelength of light, nm;
theta-angle of incidence of light.
When light is transmitted in the optical fiber, the incident angle is generally less than or equal to 8 degrees, and the incident angle is basically vertical to the end face of the optical fiber, namely, the light incident to the end face of the optical fiber can not generate diffuse reflection. The wavelength lambda of the light in the optical fiber transmission system is 1310 nm-1550 nm in the infrared region, and h is less than or equal to 82 nm-97 nm. That is, if the unevenness of the roughness of the end face of the optical fiber is less than 82nm to 97nm, no diffuse reflection occurs at the end face of the optical fiber after light is incident.
The mechanism of fiber end face grinding:
optical fiber material, diamond abrasive and ZrO2The mechanical properties of the ceramic material are shown in table 1.
TABLE 1 mechanical Properties of materials for optical fiber, zirconia ceramic, and diamond abrasive
A key process in the manufacturing process of the optical fiber reflector is grinding and polishing of the end face of the optical fiber, the optical fiber belongs to a hard and brittle glass material, the material removal mechanism is generally brittle fracture during processing, if proper measures are not taken, a large number of micro cracks or pits are inevitably generated in the processing process, the surface roughness of the micro cracks or pits is high, light scattering and absorption are caused, and the improvement of the optical performance of the optical fiber reflector is extremely unfavorable. When the end face (adhered to the inside of the ferrule) of the optical fiber is ground, i.e. when brittle materials such as ceramics, glass and the like are ground, ground and polished, as long as the cutting depth of the abrasive grain size is less than a certain critical value related to the performance of the workpiece material, the brittle materials can be removed in a plastic flow mode, so that a processing surface with high surface quality can be obtained.
The condition for achieving brittle transition when grinding glass materials is established by using a micro-indentation method, namely the cutting depth of a single abrasive particle is smaller than the critical cutting depth of the brittle material.
Substituting the material property values of the silica glass optical fiber in Table 1 into formula (1) to obtain the critical cutting depth d of the optical fiberc0.023 mu m. In the polishing process, when the cutting depth of the abrasive particles is lower than the critical cutting depth of the brittle transition, the optical fiber end face with high quality can be polished in a ductile mode.
When the granularity of the diamond abrasive is less than 20 mu m, the abrasive can be regarded as a sphere, the contact state of the abrasive and a workpiece in the grinding process is analyzed, and the cutting depth of the single diamond abrasive grain is obtained by applying the Hertz contact theory
In the formula Ka-abrasive concentration, percentage of area of abrasive on sandpaper;
Kp-the grinding pressure coefficient is a value of dimension equal to the nominal grinding pressure p;
Da-abrasive particle size;
E*-an equivalent elastic modulus;
Ea-the modulus of elasticity of the abrasive material;
vf-the poisson's ratio of the optical fiber;
va-poisson's ratio of abrasive.
Empirical estimation of KaAbout 0.5; the set nominal polishing pressure p is 0.48MPa, i.e. Kp0.48; the material property values of the silica glass optical fiber and the diamond abrasive in table 1 are substituted into formula (2) to obtain the cutting depths of different abrasives, as shown in table 2.
TABLE 2 depth of cut of abrasives of different particle sizes
| Abrasive particle size Da/μm | Depth of cut d/μm |
| 6 | 0.0376 |
| 3 | 0.0188 |
| 1 | 0.0063 |
| 0.2 | 0.0013 |
Therefore, when the average particle size of the diamond abrasive is 6 μm, the cutting depth of most of the abrasive is about 0.0376 μm, which is larger than the critical cutting depth, and the optical fiber material is removed in a brittle fracture mode; when the average grain size of the diamond abrasive is 3 μm, the cutting depth of the abrasive grain is 0.0188m, which is similar to the critical cutting depth, but in practice, part of the abrasive grain has a size larger than 3m, so that the material removal is represented by a semi-brittle semi-ductile removal mode; when the average particle size of the abrasive is less than 1 μm, most of the abrasive particles have a cutting depth less than the critical cutting depth, and the surface material of the optical fiber is plastically fluidized and removed in a ductile mode.
The influence of the roughness of the end face of the optical fiber on the light reflection can be analyzed to obtain: in order to avoid the diffuse reflection of the end face of the optical fiber and improve the reflectivity of the reflected light of the end face of the optical fiber, the roughness unevenness of the end face of the optical fiber is smaller than 82nm to 97nm corresponding to a 1310nm to 1550nm waveband. And the roughness level can be realized by polishing the end face of the optical fiber through analysis of the grinding mechanism of the end face of the optical fiber.
According to the optical fiber end face grinding and polishing mechanism, the optical fiber reflector end face grinding and polishing process can be designed into a series of grinding and polishing flows from brittle fracture (the cutting depth of abrasive particles is more than 0.023m) to ductile fracture, as shown in FIG. 6.
Designing a reflector lens:
the film of the reflector is designed according to the reflection principle of the dielectric film. The dielectric film reflection principle is based on multi-beam interference and is formed by alternately evaporating two materials with high and low refractive indexes, and the optical thickness of each film is one fourth of a certain wavelength. Under this condition, the reflected light vectors on the interfaces participating in the superposition have the same vibration direction. The synthesized amplitude increases with the increase of the number of the layers of the film, but due to absorption and scattering loss in the film layers, when the film system reaches a certain number of layers, the reflectivity can not be improved any more, and the maximum value of the theoretical design can reach 99.99%.
As can be seen from FIG. 7, the reflectivity of the reflector in the wavelength range of 1510-1590 nm is much greater than 95%.
Selecting the type of the bonding glue:
the key process of the surface mount type multimode fiber reflector is a lens bonding process, and the key point of the lens bonding process is bonding glue type selection. The function of the adhesive is mainly to bond the lens and the ceramic ferrule, so that the lens does not shift under the temperature change, and the reflector has a stable optical signal reflection function.
In addition, glue should not remain in the light path of the reflector because the refractive index of the glue in the light path changes under the temperature change, which affects the reflection function of the reflector. Therefore, when the lens is bonded, the fluidity of the bonding glue is moderate, and the bonding glue flows into the gap between the lens and the ceramic ferrule and does not flow into the optical fiber core area before ultraviolet curing.
The adhesive for bonding the reflector plate has great influence on the normal temperature performance and the full temperature performance of the reflector. Therefore, the adhesive has good ultraviolet curing characteristics, suitable viscosity, suitable hardness, suitable elastic modulus, and the like.
Tests prove that the UV649 adhesive has high viscosity and poor flowability, is not easy to flow into an optical fiber area when being bonded with a lens, has good reflectivity uniformity of the reflector after being bonded with the lens, and is suitable for bonding the reflector lens.
The invention replaces the mode of coating the film on the end face of the ceramic ferrule by the mode of bonding the optical coated lens on the end face of the ceramic ferrule, and the contact surface of the film layer is changed into an adhesive from the surface consisting of the end face of the ceramic ferrule, epoxy resin glue and the end face of the optical fiber, thereby avoiding the film layer crack caused by the temperature change of the end face coating film; according to the invention, the cutting depth of the abrasive particle size of the grinder is smaller than the critical cutting depth of the optical fiber, and the abrasive particle size can be removed in a plastic flow mode, so that a machined surface with higher surface quality can be obtained; in the process of bonding the lens, the coating position of the adhesive is controlled to ensure that the adhesive does not contact the end face of the optical fiber, so that the loss caused by light transmission in the adhesive is reduced, and the reflectivity of the optical fiber reflector is improved; in the process of bonding the lens, the adhesive is uniformly coated on the end faces of the lens and the ceramic ferrule by controlling the coating position of the adhesive, so that the distances between the lens and the end face of the ceramic ferrule are equal, and the inclination of the lens under the temperature change is reduced, thereby reducing the change of the reflectivity of the optical fiber reflector under the temperature change; when the lens is adhered, the optical fiber coupler is utilized, the end 1 is connected with the light source, the end 2 is connected with the power meter, the end 3 is connected with the optical fiber reflector to be adhered, and the end 4 is subjected to light limiting treatment. The reflection power of the optical fiber reflector is detected in real time in a light passing mode in the tail fiber of the optical fiber reflector, and the position of the lens during bonding is represented by the reflectivity of the optical fiber reflector.
Although the present invention has been described with reference to the preferred embodiments, it is not intended to limit the present invention, and those skilled in the art can make variations and modifications of the present invention without departing from the spirit and scope of the present invention by using the methods and technical contents disclosed above.
Claims (10)
1. A preparation method of a novel patch type tight sleeve multimode fiber reflector is characterized by comprising the following steps:
the method comprises the following steps: peeling off a coating layer with a preset length and an optical fiber section of the tight sleeve from the optical fiber with the tight sleeve, peeling off the coating layer and the optical fiber section of the tight sleeve, dipping an epoxy adhesive, penetrating the epoxy adhesive into the ceramic ferrule, and heating to cure the epoxy adhesive so as to firmly bond the optical fiber and the ceramic ferrule through epoxy resin adhesive;
step two: removing part of the optical fiber protruding out of one end of the ceramic ferrule, and placing the optical fiber and the end face of the ceramic ferrule on an end face grinding machine for grinding and polishing;
step three: bonding the K9 glass film-coated membrane to the end faces of the optical fiber and the ceramic ferrule by using an adhesive to obtain an optical fiber assembly;
step four: arranging the optical fiber assembly in the stainless steel tube shell through epoxy resin glue;
step five: and fixing the optical fiber and the stainless steel tube shell together by using tail fiber protective silicon rubber at the sealing opening of the stainless steel tube shell.
2. The method for manufacturing the novel patch type tight-sleeve multimode fiber reflector according to claim 1, wherein the method comprises the following steps: in step one, the length of the optical fiber is 6 meters.
3. The method for manufacturing the novel patch type tight-sleeve multimode fiber reflector according to claim 1, wherein the method comprises the following steps: in the first step, the preset length is 1 cm.
4. The method for manufacturing the novel patch type tight-sleeve multimode fiber reflector according to claim 1, wherein the method comprises the following steps: in the third step, the K9 glass film coating membrane is obtained by the following method:
an optical film is plated on one surface of K9 glass with the size of 0.7mm x 0.7mm by adopting an optical film plating mode.
5. The method for manufacturing the novel patch type tight-sleeve multimode fiber reflector according to claim 1, wherein the method comprises the following steps: in the second step, the grinding and polishing process is performed so that the depth of cut of the abrasive grain size of the grinder is less than the critical depth of cut of the optical fiber.
6. The method for manufacturing the novel patch type tight-sleeve multimode fiber reflector according to claim 5, wherein the method comprises the following steps: the critical depth of cut of the optical fiber is obtained by the following formula:
wherein d iscIs the critical depth of cut of the optical fiber, EfIs the modulus of elasticity, HV, of an optical fiberfIs the Vickers microhardness, K, of an optical fiberICIs the fracture toughness of the optical fiber.
7. The method for manufacturing the novel patch type tight-sleeve multimode fiber reflector according to claim 5, wherein the method comprises the following steps: the abrasive of the grinder is diamond abrasive.
8. The method for manufacturing the novel patch type tight-sleeve multimode fiber reflector according to claim 7, wherein the method comprises the following steps: when the particle size of the diamond abrasive is less than 20 mu m, the abrasive is regarded as a sphere, and the cutting depth of the single diamond abrasive particle is obtained by applying the Hertz contact theory.
9. The method for manufacturing the novel patch type tight-sleeve multimode fiber reflector according to claim 8, wherein the method comprises the following steps: the depth of cut of a single diamond abrasive grain is obtained by the following formula:
wherein, KaAs abrasive concentration, KpTo grind the pressure coefficient, DaTo an abrasive particle size, E*Is equivalent elastic modulus, HV'fIs the vickers microhardness of the abrasive.
10. The method for manufacturing the novel patch-type tight-sleeve multimode fiber reflector according to claim 9, wherein the method comprises the following steps: equivalent modulus of elasticity E*Obtained by the following formula:
wherein E isaIs elasticity of abrasiveModulus, vfIs the Poisson's ratio, v, of the optical fiberaIs the poisson's ratio of the abrasive.
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| JP2005055415A (en) * | 2003-08-02 | 2005-03-03 | Ishihara Sangyo:Kk | Optical fiber type fabry-perot resonator |
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| CN103869416A (en) * | 2014-02-28 | 2014-06-18 | 北京航天时代光电科技有限公司 | Optical fiber reflector based on deep hole ceramic packaging structure |
| CN112731593A (en) * | 2021-01-05 | 2021-04-30 | 南通大学 | All-fiber micro-fiber reflector and preparation method thereof |
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| JP2005055415A (en) * | 2003-08-02 | 2005-03-03 | Ishihara Sangyo:Kk | Optical fiber type fabry-perot resonator |
| CN103792619A (en) * | 2014-01-17 | 2014-05-14 | 北京航天时代光电科技有限公司 | Photonic crystal fiber grinding and polishing technology method |
| CN103869417A (en) * | 2014-02-28 | 2014-06-18 | 北京航天时代光电科技有限公司 | High-reliability single mode fiber reflector and preparing method thereof |
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Application publication date: 20211126 |