Miniaturized wavelength-adjustable fiber bragg grating packaging structure and use method thereof
By introducing fine-tuning units and fixed units into the fiber grating packaging structure, combining the drive motor and gear system, the center wavelength of the fiber grating is adjusted in real time, the problem of wavelength drift during the fiber grating production and packaging process is solved, and the secondary re-repair and qualification rate improvement of the fiber grating is achieved.
Patent Information
- Application Number
- CN202510646781.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-05-20
- Publication Date
- 2025-07-29
AI Technical Summary
During the existing fiber grating production and packaging process, the center wavelength drift causes the fiber grating to be unusable and cannot be re-renovated, and the pass rate is low.
The structural design of packaging shells, shells, fiber grating bodies and adjustment components is adopted. The two ends of the fiber grating bodies are fixed by fine-tuning units and fixing units, and the grating period length is adjusted by using the driving motor and gear system, and the center wavelength is monitored and adjusted in real time to achieve secondary re-repair.
The pass rate of fiber grating is improved, and the central wavelength reaches the expected value through secondary adjustment, which improves the product yield rate.
Smart Images
Figure CN120386060A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of fiber Bragg gratings, and particularly to a miniaturized adjustable wavelength fiber Bragg grating packaging structure and a using method thereof. Background Art
[0002] A fiber Bragg grating is a diffraction grating formed by axially periodically modulating the refractive index of the fiber core by a certain method. It has the characteristics of simple structure, small device volume, wide bandwidth range, good coupling, small additional loss, and can be integrated with other fiber devices, and has been widely used in fiber sensing and optical information processing.
[0003] Heating the optical fiber to produce a fiber Bragg grating is one of the ways of fiber Bragg grating production and manufacturing. Its principle is as follows: on the one hand, it is the thermo-optic effect. The refractive index of the optical fiber material (such as silica optical fiber) will change with the temperature. When the optical fiber is heated, the thermal motion of atoms or molecules inside the material intensifies, the electron energy level distribution changes, resulting in a change in the polarizability of the material, and thus the refractive index increases; on the other hand, it is the thermal expansion effect. The optical fiber will undergo thermal expansion when heated, and both its length and diameter will increase. For the manufacturing of fiber Bragg gratings, thermal expansion will change the periodic structure parameters (such as the grating period) inside the optical fiber.
[0004] During the production process of fiber Bragg gratings, if the heating temperature is not well controlled, or when the temperature changes, the central wavelength of the fiber Bragg grating may drift. In the existing processing methods, if the central wavelength of the fiber Bragg grating drifts, then the fiber Bragg grating is a non-conforming device and cannot be used; and in the existing packaging methods, the fiber Bragg grating and indium steel are fixed with glue, and the central wavelength of the fiber Bragg grating will shift again after the glue is cured, resulting in a packaging qualification rate of 85 - 90%, and the non-conforming devices cannot be repaired twice.
[0005] In view of this, overcoming the defects of this prior art is an urgent problem to be solved in this technical field. Summary of the Invention
[0006] The technical problem to be solved by the embodiments of the present invention is that in the production and packaging processes of existing fiber Bragg gratings, if the central wavelength of the fiber Bragg grating drifts, the fiber Bragg grating cannot be used and cannot be repaired twice.
[0007] The embodiments of the present invention adopt the following technical solutions: In a first aspect, the present invention provides a miniaturized adjustable wavelength fiber Bragg grating packaging structure, including: a packaging shell 1, a shell base 2, a fiber Bragg grating body 3, and an adjustment component 4; the packaging shell 1 is fixedly connected to the shell base 2, and the packaging shell 1 covers the outside of the shell base 2 and the fiber Bragg grating body 3; The adjustment assembly 4 includes a fine-tuning unit 40 and a fixing unit 41. The fine-tuning unit 40 and the fixing unit 41 are respectively arranged at two ends of the upper surface of the shell base 2. The fine-tuning unit 40 is slidably connected to the shell base 2, the fixing unit 41 is fixedly arranged on the shell base 2, and the positions of the optical fiber grating body 3 near both ends are respectively fixed on the fine-tuning unit 40 and the fixing unit 41.
[0008] Preferably, the fine-tuning unit 40 includes a gear 400, a first adjustment seat 401 and a first fixing block 402. The first adjustment seat 401 is slidably connected to the shell base 2; the first adjustment seat 401 includes a first rack portion 4010 and a first mounting portion 4011. The first rack portion 4010 and the first mounting portion 4011 are fixedly connected. The gear 400 meshes with the first rack portion 4010. The first fixing block 402 is fixedly arranged on the first mounting portion 4011, and the optical fiber grating body 3 is fixedly arranged on the first fixing block 402.
[0009] Preferably, a first accommodation groove 4012 is arranged on the first rack portion 4010, and the first accommodation groove 4012 is used for accommodating the pigtail of one end of the optical fiber grating body 3.
[0010] Preferably, the adjustment assembly 4 further includes a driving motor 42. The driving shaft of the driving motor 42 is coupled with the gear shaft 4000 of the gear 400, and the driving motor 42 is used to drive the gear 400 to rotate.
[0011] Preferably, adjustment holes 10 are arranged on two side surfaces of the encapsulation shell 1. The gear shaft 4000 of the gear 400 is respectively rotatably connected to the two adjustment holes 10, and the gear shaft 4000 of the gear 400 is coupled with the driving shaft of the driving motor 42.
[0012] Preferably, the expansion coefficient of the first fixing block 402 is greater than the expansion coefficients of the gear 400 and the first adjustment seat 401.
[0013] Preferably, the fixing unit 41 includes a second adjustment seat 410 and a second fixing block 411. The second adjustment seat 410 includes a second rack portion 4100 and a second mounting portion 4101. The second rack portion 4100 and the second mounting portion 4101 are fixedly connected. The second fixing block 411 is fixed on the second mounting portion 4101, and the optical fiber grating body 3 is fixedly arranged on the second fixing block 411.
[0014] Preferably, a second accommodation groove 4102 is arranged on the second rack portion 4100, and the second accommodation groove 4102 is used for accommodating the pigtail of the other end of the optical fiber grating body 3.
[0015] Preferably, the expansion coefficient of the second fixing block 411 is less than that of the second adjusting base 410.
[0016] In a second aspect, based on the first aspect, the present invention provides a method for using a miniaturized tunable wavelength fiber grating packaging structure, which is applicable to the miniaturized tunable wavelength fiber grating packaging structure described in the first aspect, including: Pre-tighten the fiber grating body 3, and fix both ends of the fiber grating body 3 on the fine-tuning unit 40 and the fixing unit 41 respectively, and reserve pigtails at both ends where the fiber grating body 3 is fixed for device connection; Place the whole packaging structure on a constant temperature furnace to heat the fiber grating body 3, and monitor the central wavelength of the fiber grating body 3 in real time; When the central wavelength deviates, control the fine-tuning unit 40 to move a preset distance until the central wavelength meets the expected wavelength value, lock the fine-tuning unit 40, and package the packaging shell 1 and the shell base 2; After the packaging is completed, keep the whole packaging structure stable for a preset time, and then measure the central wavelength again; if it meets the expected wavelength value, perform secondary packaging on the packaging shell 1 to obtain a finished product; if it does not meet the expected wavelength value, control the fine-tuning unit 40 to move again to tighten or relax the fiber grating body 3 until the central wavelength is adjusted to meet the expected wavelength value, and then perform secondary packaging on the packaging shell 1 to obtain a finished product.
[0017] Compared with the prior art, the beneficial effects of the embodiments of the present invention are as follows: By arranging the fine-tuning unit 40 and the fixing unit 41 on the shell base 2, and fixing the positions near both ends of the fiber grating body 3 on the fine-tuning unit 40 and the fixing unit 41 respectively, during the heating production process of the fiber grating body 3, if the central wavelength of the fiber grating body 3 drifts, the position of the fine-tuning unit 40 can be moved to straighten or relax the optical fiber, so as to adjust the grating period length of the fiber grating body 3, thereby adjusting the central wavelength of the fiber grating body 3 to approach the expected wavelength value; after the packaging shell 1 and the shell base 2 are packaged once, the packaged product is detected. If it does not meet the expected wavelength value, the fine-tuning unit 40 can be adjusted twice to make the central wavelength of the fiber grating body 3 approach the expected wavelength value, realizing secondary repair of the device, thereby improving the qualified rate of the product. Description of the Drawings
[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings required for the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can also be obtained based on these drawings.
[0019] Figure 1 It is a schematic diagram of the overall structure of a miniaturized tunable wavelength fiber grating packaging structure provided by an embodiment of the present invention; Figure 2 It is a schematic diagram of the fine-tuning unit and the fixing unit of a miniaturized tunable wavelength fiber grating packaging structure provided by an embodiment of the present invention; Figure 3a It is a schematic diagram of the first adjusting seat and the second adjusting seat of a miniaturized tunable wavelength fiber grating packaging structure provided by an embodiment of the present invention; Figure 3b It is a schematic diagram of the chute and the sliding protrusion of a miniaturized tunable wavelength fiber grating packaging structure provided by an embodiment of the present invention; Figure 4 It is a schematic diagram of the gear of a miniaturized tunable wavelength fiber grating packaging structure provided by an embodiment of the present invention; Figure 5 It is a schematic diagram of the packaging shell of a miniaturized tunable wavelength fiber grating packaging structure provided by an embodiment of the present invention; Figure 6 It is a schematic diagram of the grating of the fiber grating body of a miniaturized tunable wavelength fiber grating packaging structure provided by an embodiment of the present invention; Figure 7 It is a schematic diagram of the first receiving groove and the second receiving groove of a miniaturized tunable wavelength fiber grating packaging structure provided by an embodiment of the present invention; Figure 8 It is a schematic diagram of the usage process of a miniaturized tunable wavelength fiber grating packaging structure provided by an embodiment of the present invention; Figure 9 It is a schematic diagram of the linear stepper motor module of a miniaturized tunable wavelength fiber grating packaging structure provided by an embodiment of the present invention; Figure 10 It is a top view of the operating table of a miniaturized tunable wavelength fiber grating packaging structure provided by an embodiment of the present invention.
[0020] Among them, the reference numerals are: 1 - Encapsulation housing, 10 - Adjustment hole, 2 - Housing base, 20 - Slide groove, 3 - Fiber Bragg grating body, 4 - Adjustment assembly, 40 - Fine adjustment unit, 400 - Gear, 4000 - Gear shaft, 401 - First adjustment seat, 4010 - First rack portion, 4011 - First mounting portion, 4012 - First receiving groove, 4013 - Sliding projection, 402 - First fixing block, 41 - Fixing unit, 410 - Second adjustment seat, 4100 - Second rack portion, 4101 - Second mounting portion, 4102 - Second receiving groove, 411 - Second fixing block, 42 - Driving motor, 43 - Linear stepping motor module. Detailed implementation manner
[0021] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.
[0022] Unless otherwise required by the context, the term "comprising" is interpreted in an open and inclusive sense throughout the specification and claims, that is, "including, but not limited to". In the description of the specification, the terms "one embodiment", "some embodiments", "exemplary embodiments", "examples", "specific examples" or "some examples" etc. are intended to indicate that specific features, structures, materials or characteristics related to the embodiment or example are included in at least one embodiment or example of the present disclosure. The schematic representations of the above terms are not necessarily referring to the same embodiment or example. In addition, the specific features, structures, materials or characteristics may be included in any one or more embodiments or examples in any appropriate manner, that is, although they may be carried in the above-mentioned embodiments or examples due to reasons such as the order of appearance and position, etc., but it does not limit that they can be carried by one embodiment or example in a combined manner.
[0023] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present disclosure and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation to the present disclosure.
[0024] In the description of the present invention, the terms "first" and "second" are used for descriptive purposes only, and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the embodiments of the present disclosure, unless otherwise specified, the meaning of "a plurality" is two or more. In addition, for example, in the description, for the same type of nouns, the method of adding "A" and "B" at the end is used to describe them as two independent individuals. In this case, the features defined with "A" and "B" are only used for the purpose of distinguishing the same type of individuals, and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features.
[0025] In the description of some embodiments, the expressions "coupled", "coupled to" and "connected" and their derivatives may be used. For example, in the description of some embodiments, the term "connected" may be used to indicate that two or more components have direct physical contact or electrical contact with each other. Another example is that in the description of some embodiments, the term "coupled to" may be used to indicate that two or more components have direct physical contact or electrical contact. However, the term "connected" or "coupled" may also mean that two or more components do not have direct contact with each other, but still cooperate or interact with each other, such as "optical path coupling" and "wireless connection". The embodiments disclosed herein are not necessarily limited to the content of the present invention.
[0026] In the description of the present invention, the expression "A and / or B" (where A and B are used to formally represent specific feature contents) is involved, and the corresponding expression includes the following three combinations: only A, only B, and the combination of A and B.
[0027] In the present invention, "about", "substantially" or "approximately" includes the stated value and the average value within an acceptable deviation range of the specific value, where the acceptable deviation range is determined by those of ordinary skill in the art considering the measurement being discussed and the errors associated with the measurement of the specific quantity (i.e., the limitations of the measurement system).
[0028] Embodiment 1: Embodiment 1 of the present invention provides a miniaturized and tunable wavelength fiber grating packaging structure, as Figure 1 shown, including: a packaging shell 1, a shell base 2, a fiber grating body 3 and an adjustment component 4; the packaging shell 1 is fixedly connected to the shell base 2, and the packaging shell 1 covers the outside of the shell base 2 and the fiber grating body 3. Specifically, the packaging shell 1 and the shell base 2 can be fixed by laser welding. As Figure 2As shown, the adjustment component 4 includes a fine-tuning unit 40 and a fixing unit 41. The fine-tuning unit 40 and the fixing unit 41 are respectively arranged at two ends of the upper surface of the tube seat 2. The fine-tuning unit 40 is slidably connected to the tube seat 2, and the fixing unit 41 is fixedly arranged on the tube seat 2. The positions of the optical fiber grating body 3 near both ends are respectively fixed on the fine-tuning unit 40 and the fixing unit 41. Wherein, pigtails are respectively reserved at both ends of the optical fiber grating body 3 for connection with external devices, and the pigtails extend out of both ends of the encapsulation tube shell 1 and the tube seat 2.
[0029] By arranging the fine-tuning unit 40 and the fixing unit 41 on the tube seat 2, and fixing the positions of the optical fiber grating body 3 near both ends on the fine-tuning unit 40 and the fixing unit 41 respectively, during the heating production process of the optical fiber grating body 3, if the central wavelength of the optical fiber grating body 3 drifts, the position of the fine-tuning unit 40 can be moved and adjusted to straighten or relax the optical fiber, so as to adjust the grating period length of the optical fiber grating body 3, thereby adjusting the central wavelength of the optical fiber grating body 3 to approach the expected wavelength value; after the encapsulation tube shell 1 and the tube seat 2 are encapsulated once, the encapsulated product is detected. If it does not meet the expected wavelength value, the fine-tuning unit 40 can be adjusted secondly to make the central wavelength of the optical fiber grating body 3 approach the expected wavelength value, realizing the secondary repair of the device, thereby improving the qualified rate of the product.
[0030] To fully elaborate the technical solution provided by the embodiments of the present invention, the structures provided in the above content will be further elaborated in detail below.
[0031] For the fine-tuning unit 40 mentioned in the above structure, in the actual application scenario, the fine-tuning unit 40 drives one end of the optical fiber grating body 3 to move slightly, such as 0.1 mm, so as to slightly straighten or relax the optical fiber grating body 3. To achieve this function, as Figure 2 and Figure 3aAs shown, the fine-tuning unit 40 includes a gear 400, a first adjusting seat 401, and a first fixing block 402. The first adjusting seat 401 is slidably connected to the housing seat 2. The first adjusting seat 401 includes a first rack portion 4010 and a first mounting portion 4011. The first rack portion 4010 and the first mounting portion 4011 are fixedly connected. The gear 400 meshes with the first rack portion 4010. The first fixing block 402 is fixedly arranged on the first mounting portion 4011, and the fiber Bragg grating body 3 is fixedly arranged on the first fixing block 402. Among them, the fiber Bragg grating body 3 can be fixedly connected to the first fixing block 402 by using AC glue. In one embodiment, the number of teeth of the gear 400 can be 20, the number of teeth of the first rack portion 4010 can be 40, the tooth ratio of the gear 400 to the first rack is 1:2, and the tooth width of the gear 400 can be 0.5 mm to 1 mm.
[0032] In one embodiment, the slidable connection between the first adjusting seat 401 and the housing seat 2 can be as Figure 3b shown. A chute 20 is provided on the housing seat 2. At least two sliding protrusions 4013 are provided at the bottom of the first adjusting seat 401. The sliding protrusions 4013 are symmetrically arranged on both sides of the first adjusting seat 401, and the sliding protrusions 4013 are slidably connected to the chute 20.
[0033] The fine-tuning unit 40 drives one end of the fiber Bragg grating body 3 to move. The other end of the fiber Bragg grating body 3 is fixed on the fixing unit 41. Based on this, the fixing unit 41 includes a second adjusting seat 410 and a second fixing block 411. The second adjusting seat 410 includes a second rack portion 4100 and a second mounting portion 4101. The second rack portion 4100 and the second mounting portion 4101 are fixedly connected. The second fixing block 411 is fixed on the second mounting portion 4101, and the fiber Bragg grating body 3 is fixedly arranged on the second fixing block 411. Among them, the fiber Bragg grating body 3 can be fixedly connected to the second fixing block 411 by using AC glue.
[0034] In order to realize the adjustment function of the fine-tuning unit 40 so that the gear 400 can rotate, as Figure 4As shown, the adjustment assembly 4 further includes a drive motor 42. The drive shaft of the drive motor 42 is coupled to the gear shaft 4000 of the gear 400. The drive motor 42 is used to drive the gear 400 to rotate. The gear 400 drives the first adjustment seat 401 to move. After the first adjustment seat 401 is adjusted to a suitable position, in order to improve the stability of the encapsulation structure during operation, it is necessary to fix the first adjustment seat 401 at the adjusted position. Since the first rack portion 4010 of the first adjustment seat 401 and the gear 400 are in a meshed state, only by fixing the gear 400 can the first adjustment seat 401 be fixed. As Figure 5 shown, adjustment holes 10 are provided on two side surfaces of the encapsulation tube shell 1. The gear shafts 4000 of the gear 400 are respectively rotatably connected to the two adjustment holes 10, and the gear shafts 4000 of the gear 400 are coupled to the drive shaft of the drive motor 42. During final encapsulation, a high-strength structural adhesive can be used to fix the adjustment holes 10 and the gear shafts 4000 to prevent the gear 400 from rotating, thereby fixing the position of the first adjustment seat 401.
[0035] As Figure 6 shown, according to Bragg's equation , where represents the Bragg wavelength, that is, the central wavelength of the grating; is the effective refractive index of the grating; is the grating period, that is, the spatial period of refractive index modulation. During the heating production process of the fiber grating body 3, when the ambient temperature reaches the preset temperature value and remains stable, the center point of the optical fiber grating body will expand, increasing the length of the fiber grating body 3 and the length of the grating period. According to the above formula, the Bragg wavelength is positively correlated with the length of the grating period. As the length of the grating period increases, the Bragg wavelength drifts towards the long-wave direction.
[0036] In the actual production and processing process, the entire encapsulation shell 1 is placed on a constant temperature furnace. After the constant temperature furnace is heated to a preset temperature (e.g., 850 °C), it maintains the temperature and heats the fiber grating body 3. During the heating process of the fiber grating body 3, the length of the fiber grating body 3 increases, the grating period length increases, and the central wavelength shifts towards the long wavelength direction. During this period, if it is detected that the central wavelength shifts too much towards the long wavelength direction, it indicates that the grating period length is too large. The two fixed ends of the fiber grating body 3 can be made closer by rotating the gear 400 to relax the fiber grating body 3 and reduce the length of the grating period; after it is detected that the grating central wavelength reaches the preset wavelength value, the temperature is slowly decreased. During the cooling process, the fiber grating body 3 shrinks, the length decreases, the grating period length decreases, and the central wavelength shifts towards the short wavelength direction, and the central wavelength approaches the wavelength point specified by the International Telecommunication Union - Telecommunication Standardization Sector (ITU-T); after the fiber grating body 3 cools and stabilizes, a secondary detection is performed. If the central wavelength shifts, the gear 400 is rotated for fine adjustment. If the central wavelength is longer, the fiber grating body 3 is relaxed. If the central wavelength is shorter, the fiber grating body 3 is straightened.
[0037] According to the above production and processing process, the change in the central wavelength of the fiber grating body 3 can be reflected by the following formula: ; where is the change in the Bragg wavelength, represents the photoelastic coefficient of the fiber grating body 3, represents the thermo-optic coefficient, represents the change in the strain of the fiber grating body 3, represents the change in temperature. During the period when the constant temperature furnace maintains a constant temperature and after the entire encapsulation structure is placed and cooled to room temperature, , and at this time the only variable is . In the case where the fiber grating body 3 is relaxed, <0, the central wavelength decreases and shifts towards the short wavelength direction; in the case where the fiber grating body 3 is straightened, >0, the central wavelength increases and shifts towards the long wavelength direction.
[0038] According to the above principle and combined with the experience in the actual processing and production process, during the heating process of the constant temperature furnace, after the central wavelength reaches the expected wavelength value, it often shifts more towards the long wavelength. Therefore, in the overall design of the packaging structure, specific materials are used to reduce the stress of the fiber grating body 3 during the heating process. Based on this, in this embodiment, the expansion coefficient of the first fixing block 402 is greater than the expansion coefficients of the gear 400 and the first adjusting seat 401; the expansion coefficient of the second fixing block 411 is less than the expansion coefficient of the second adjusting seat 410. In a preferred solution, the material of the first fixing block 402 can be invar, the materials of the gear 400 and the first adjusting seat 401 can be brass; the material of the second fixing block 411 is invar, and the material of the second adjusting seat 410 is brass. The expansion coefficient of brass is greater than that of invar. Since the temperature of the fiber grating body 3 is relatively high during the heating process and the expansion coefficient of invar is relatively low, invar is not prone to deformation. Therefore, when the fiber grating body 3 is fixed on invar, the fiber grating body 3 is not easily separated from the invar; while brass is relatively wear-resistant, the gear 400 and the first adjusting seat 401 made of brass are more durable, and the expansion coefficient of brass is relatively high. During the heating process of the fiber grating body 3, the volume of the first mounting portion 4011 of the first adjusting seat 401 and the second mounting portion 4101 of the second adjusting seat 410 increases after expansion, so that the two fixed ends of the fiber grating body 3 approach each other, thus playing the same role as rotating the gear 400 to make the two fixed ends of the fiber grating body 3 approach each other as described above. And, in order to make the volumes of the first adjusting seat 401 and the second adjusting seat 410 equal after expansion, the first adjusting seat 401 and the second adjusting seat 410 have the same shape.
[0039] After the packaging structure is processed, the pigtails reserved at both ends of the fiber grating body 3 need to extend out of the packaging structure. Therefore, as Figure 7 shown, a first receiving groove 4012 is provided on the first rack portion 4010, and the first receiving groove 4012 is used to receive the pigtail at one end of the fiber grating body 3; a second receiving groove 4102 is provided on the second rack portion 4100, and the second receiving groove 4102 is used to receive the pigtail at the other end of the fiber grating body 3, so that both ends of the fiber grating body 3 can be connected to external devices.
[0040] In summary, the embodiment of the present invention further provides a method for using a miniaturized tunable wavelength fiber grating packaging structure, which is applicable to the miniaturized tunable wavelength fiber grating packaging structure described in the above solution. As Figure 8 shown, it includes: In step S1, the fiber grating body 3 is pre-tensioned, and both ends of the fiber grating body 3 are respectively fixed on the fine adjustment unit 40 and the fixing unit 41, and pigtails are reserved at both fixed ends of the fiber grating body 3 for device connection.
[0041] Specifically, both ends of the fiber grating body 3 are respectively fixed on the first fixing block 402 and the second fixing block 411, and both ends of the fiber grating body 3 are respectively placed in the first receiving groove 4012 and the second receiving groove 4102.
[0042] In step S2, the whole encapsulation structure is placed on a constant temperature furnace to heat the fiber grating body 3, and the central wavelength of the fiber grating body 3 is monitored in real time.
[0043] In one embodiment, a spectrum analyzer or a tunable laser combined with a power meter and other devices can be used to monitor the central wavelength of the fiber grating body 3.
[0044] In step S3, when the central wavelength deviates, the fine adjustment unit 40 is controlled to move a preset distance until the central wavelength meets the expected wavelength value, and the fine adjustment unit 40 is locked, and the encapsulation tube shell 1 and the tube seat 2 are encapsulated.
[0045] Specifically, during the heating process, the central wavelength of the fiber grating body 3 usually shifts towards the long wavelength. When the central wavelength shifts towards the long wavelength direction, the driving motor 42 can be driven to rotate the gear 400, so that the two fixed ends of the fiber grating body 3 approach each other, thereby reducing the tensile stress of the fiber grating body 3, shortening the length of the grating period, and making the central wavelength shift towards the short wavelength direction. The preset distance can be 0.1 mm. The way to lock the fine adjustment unit 40 can be, as Figure 9 shown, the driving motor 42 can be a stepping motor, and a linear stepping motor module 43 can be arranged outside the stepping motor. The linear stepping motor module 43 is used to drive the stepping motor to move in a direction parallel to the motor shaft of the stepping motor. After adjusting the position of the fine adjustment unit 40, the linear stepping motor module 43 is controlled to move backward, so that the motor shaft of the stepping motor withdraws from the coupling with the gear shaft 4000 of the gear 400, thereby locking the position of the fine adjustment unit 40. In one embodiment, the way to encapsulate the encapsulation tube shell 1 and the tube seat 2 can be laser welding. Among them, the stepping motor can be driven by microsteps, control the spiral controller, and realize precision adjustment. The control system of the stepping motor reads the encoder data, zeros the position of the gear 400, and the user inputs the target position (such as moving 0.1 mm) through the terminal interface. The control system calculates the difference between the target position and the current position and generates a control signal. The above control methods are all technical solutions that can be easily obtained by professionals in the technical field, and will not be elaborated here.
[0046] In step S4, after the encapsulation is completed, after the overall encapsulation structure is stably stayed for a preset time, the center wavelength is measured again; if it meets the expected wavelength value, the encapsulation shell 1 is secondarily encapsulated to obtain a finished product; if it does not meet the expected wavelength value, the fine adjustment unit 40 is controlled to move again to tighten or relax the fiber grating body 3 until the center wavelength is adjusted to meet the expected wavelength value, and then the encapsulation shell 1 is secondarily encapsulated to obtain a finished product.
[0047] In an actual application scenario, the preset time can be 20 minutes. The time for the overall encapsulation structure to stably stay needs to cool the overall encapsulation structure to room temperature, so the preset time for staying can be set according to the actual processing environment.
[0048] Among them, the main purpose of the secondary encapsulation is to fix the position of the fine adjustment unit 40. The gear shaft 4000 of the gear 400 and the adjustment hole 10 are fixed with a high-strength structural adhesive to prevent the fine adjustment unit 40 from displacing during subsequent work.
[0049] According to the above steps, before the processing operation, the encapsulation shell 1, the shell seat 2, the fiber grating body 3, and the adjustment assembly 4 need to be placed on the operating table for fixation, where the form of the operating table can be as Figure 10 shown.
[0050] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.
Claims
1. A miniaturized fiber grating packaging structure with adjustable wavelength, characterized in that Including: An encapsulation shell (1), a shell base (2), an optical fiber grating body (3), and an adjustment assembly (4); the encapsulation shell (1) is fixedly connected to the shell base (2), and the encapsulation shell (1) covers the outside of the shell base (2) and the optical fiber grating body (3). The adjustment assembly (4) includes a fine-tuning unit (40) and a fixing unit (41). The fine-tuning unit (40) and the fixing unit (41) are respectively arranged at both ends of the upper surface of the shell base (2). The fine-tuning unit (40) is slidably connected to the shell base (2), the fixing unit (41) is fixedly arranged on the shell base (2), and the positions of the optical fiber grating body (3) near both ends are respectively fixed on the fine-tuning unit (40) and the fixing unit (41).
2. The miniaturized and tunable wavelength fiber grating packaging structure according to claim 1, wherein The fine-tuning unit (40) includes a gear (400), a first adjustment seat (401), and a first fixing block (402). The first adjustment seat (401) is slidably connected to the shell base (2); the first adjustment seat (401) includes a first rack portion (4010) and a first mounting portion (4011). The first rack portion (4010) and the first mounting portion (4011) are fixedly connected. The gear (400) meshes with the first rack portion (4010). The first fixing block (402) is fixedly arranged on the first mounting portion (4011), and the optical fiber grating body (3) is fixedly arranged on the first fixing block (402).
3. The miniaturized and tunable wavelength fiber grating packaging structure according to claim 2, characterized in that, A first receiving groove (4012) is arranged on the first rack portion (4010), and the first receiving groove (4012) is used to receive the pigtail of one end of the optical fiber grating body (3).
4. The miniaturized fiber grating package structure with adjustable wavelength according to claim 2, characterized in that, The adjustment assembly (4) further includes a driving motor (42). The driving shaft of the driving motor (42) is coupled to the gear shaft (4000) of the gear (400), and the driving motor (42) is used to drive the gear (400) to rotate.
5. The miniaturized and tunable wavelength fiber grating packaging structure according to claim 4, wherein Adjustment holes (10) are arranged on two side surfaces of the encapsulation shell (1). The gear shafts (4000) of the gear (400) are respectively rotatably connected to the two adjustment holes (10), and the gear shaft (4000) of the gear (400) is coupled to the driving shaft of the driving motor (42).
6. The miniaturized tunable wavelength fiber grating packaging structure according to claim 2, wherein The expansion coefficient of the first fixing block (402) is greater than the expansion coefficients of the gear (400) and the first adjustment seat (401).
7. The miniaturized tunable wavelength fiber grating packaging structure according to claim 1, characterized in that, The fixing unit (41) includes a second adjustment seat (410) and a second fixing block (411). The second adjustment seat (410) includes a second rack portion (4100) and a second mounting portion (4101). The second rack portion (4100) and the second mounting portion (4101) are fixedly connected. The second fixing block (411) is fixed to the second mounting portion (4101), and the optical fiber grating body (3) is fixedly arranged on the second fixing block (411).
8. The miniaturized tunable wavelength fiber grating packaging structure according to claim 7, characterized in that, A second receiving groove (4102) is provided on the second rack portion (4100), and the second receiving groove (4102) is used to receive the pigtail at the other end of the fiber grating body (3).
9. The miniaturized and tunable wavelength fiber grating packaging structure according to claim 7, characterized in that The expansion coefficient of the second fixing block (411) is smaller than that of the second adjusting seat (410).
10. A method of using a miniaturized tunable wavelength fiber grating packaging structure, applicable to the miniaturized tunable wavelength fiber grating packaging structure according to any one of claims 1-9, characterized in that, Comprising: Pre-tightening the fiber grating body (3), and respectively fixing the two ends of the fiber grating body (3) on the fine adjustment unit (40) and the fixing unit (41), and leaving pigtails at the fixed two ends of the fiber grating body (3) for device connection; Placing the whole packaging structure on a constant temperature furnace to heat the fiber grating body (3), and monitoring the central wavelength of the fiber grating body (3) in real time; When the central wavelength deviates, controlling the fine adjustment unit (40) to move a preset distance until the central wavelength meets the expected wavelength value, locking the fine adjustment unit (40), and packaging the packaging tube shell (1) and the tube shell seat (2); After the packaging is completed, after the whole packaging structure is stably stayed for a preset time, the central wavelength is measured again; if it meets the expected wavelength value, the packaging tube shell (1) is secondarily packaged to obtain a finished product; if it does not meet the expected wavelength value, the fine adjustment unit (40) is controlled to move again to tighten or relax the fiber grating body (3) until the central wavelength is adjusted to meet the expected wavelength value, and then the packaging tube shell (1) is secondarily packaged to obtain a finished product.