Intelligent double-compensation optical fiber coupling system

Abstract

The invention discloses an intelligent double-compensation optical fiber coupling system which comprises a bottom plate, a linear displacement platform, two piezoelectric deflection mirrors, an optical fiber support, a temperature sensor, an acceleration sensor and a control device. Wherein the linear displacement platform, the at least two piezoelectric deflecting mirrors and the optical fiber bracket are fixed on the bottom plate through an independent supporting substrate; a lens assembly is mounted on the linear displacement platform; a plurality of SMA are arranged between the reflecting mirror of the piezoelectric deflecting mirror and the movable table board; an optical fiber is mounted on the optical fiber bracket, and a plurality of SMA are arranged at the mounting contact position; the lens assembly, the reflector and the optical fiber are sequentially distributed at intervals according to a preset light path; a semiconductor cooler is also mounted on the supporting substrate where the piezoelectric deflecting mirror and the optical fiber bracket are located; the linear displacement platform, the piezoelectric deflection mirror, the temperature sensor, the acceleration sensor and the semiconductor cooler are all electrically connected with the control device. The device has the dynamic alignment function and the temperature compensation function at the same time, and the overall structure is reasonable.

Description

Technical Field

[0001] The invention relates to the technical field of coupling control, and in particular to an intelligent double-compensation optical fiber coupling system. Background Art

[0002] Existing dynamic alignment technology is generally implemented using piezoelectric ceramic drivers and MEMS mirrors, which can compensate for coupling offsets caused by vibration or displacement, but does not consider the impact of temperature changes on material deformation, resulting in compensation failure at high temperatures. The general temperature compensation structure uses a one-way compensation structure with thermal expansion coefficient matching materials or shape memory alloys, which can suppress temperature drift but cannot cope with dynamic mechanical disturbances, and has a complex structure and slow response speed.

[0003] If the two are simply combined, the dynamic alignment and temperature compensation systems need to operate independently, requiring additional control modules for coordination, resulting in increased delays and energy consumption, and it is difficult to cope with scenarios where temperature and vibration interference occur. Summary of the invention

[0004] In view of this, the purpose of the present invention is to provide an intelligent dual-compensation fiber coupling system, which has dynamic alignment and temperature compensation functions and has a more reasonable overall structure.

[0005] In order to solve the above technical problems, the technical solution of the present invention is: An intelligent dual-compensation optical fiber coupling system comprises a base plate, a linear displacement platform, two piezoelectric deflection mirrors, an optical fiber bracket, a temperature sensor, an acceleration sensor and a control device; wherein the linear displacement platform, at least two piezoelectric deflection mirrors and the optical fiber bracket are all fixed on the base plate through a separate supporting substrate; A lens assembly is installed on the linear displacement platform; A plurality of SMAs are arranged between the reflector of the piezoelectric deflection mirror and the movable table; The optical fiber bracket is mounted with an optical fiber, and a plurality of SMAs are arranged at the mounting contact position; The lens assembly, reflector and optical fiber are sequentially spaced and distributed according to a preset optical path; A semiconductor refrigerator is also installed on the supporting substrate where the piezoelectric deflection mirror and the optical fiber bracket are located; the semiconductor refrigerator is used to adjust the temperature of the SMA on the supporting substrate one by one; The linear displacement platform, the piezoelectric deflection mirror, the temperature sensor, the acceleration sensor and the semiconductor refrigerator are all electrically connected to the control device.

[0006] Preferably, the support substrates are each formed by stacking heterogeneous materials with different thermal expansion coefficients, and the heterogeneous materials include quartz glass and titanium alloy.

[0007] Preferably, the ratio of quartz to titanium alloy is 1:1.2.

[0008] Preferably, a first beam splitter is installed on the base plate on a preset optical path, and an industrial camera is installed on one side of the first beam splitter; the second beam splitter is used to split the light to the industrial camera; the industrial camera is electrically connected to the control device.

[0009] Preferably, a second beam splitter is installed on the base plate on the preset optical path, and a four-quadrant detector is installed on one side of the second beam splitter; the second beam splitter is used to split the light into the four-quadrant detector; the four-quadrant detector is electrically connected to the control device.

[0010] Preferably, the linear displacement platform is a piezoelectric linear displacement platform.

[0011] Preferably, a silicon nitride thermal insulation layer is provided between the control device and the base plate.

[0012] Preferably, the bottom plate is made of an aluminum plate.

[0013] Preferably, it also includes a power meter, which is located at the end of the optical path and is used to calculate the optical fiber coupling efficiency; the power meter is electrically connected to the control device.

[0014] The technical effects of the present invention are mainly reflected in the following aspects: 1. Composite interference suppression: It simultaneously solves dynamic mechanical disturbances (vibration frequency>10Hz) and temperature drift (-40℃~85℃ range), and the coupling efficiency fluctuation is reduced from ±20% of traditional technology to within ±3%.

[0015] 2. Lightweight structure: Through heterogeneous material integration and MEMS technology, the volume is reduced by 60% compared with the traditional split system, which is suitable for space-constrained scenarios.

[0016] 3. Energy consumption optimization: The dynamic module is only activated when vibration is triggered, and the temperature compensation structure is mainly based on passive compensation, reducing the overall power consumption by 40%.

[0017] 4. Intelligent expansion: Support data interaction with external systems (such as vehicle-mounted inertial navigation and temperature control modules) to achieve predictive compensation. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the intelligent double compensation optical fiber coupling system in the embodiment; Figure 2 Schematic diagram of the installation of the lens assembly in the embodiment; Figure 3 Schematic diagram of the installation of the piezoelectric deflection mirror in the embodiment; Figure 4 This is a schematic diagram of the installation of optical fibers in the embodiment; Figure 5 4 is a working flow chart of the intelligent double compensation fiber coupling system in the embodiment.

[0019] Figure numerals: 1. base plate; 2. supporting substrate; 31. linear displacement platform; 32. industrial camera; 33. four-quadrant detector; 41. first beam splitter; 42. second beam splitter; 5. piezoelectric deflection mirror; 6. optical fiber holder; 61. optical fiber; 7. power meter; 8. acceleration sensor; 9. semiconductor refrigerator; 10. temperature sensor. DETAILED DESCRIPTION

[0020] The specific implementation modes of the present invention are further described below in conjunction with the accompanying drawings to make the technical solutions of the present invention easier to understand and grasp.

[0021] Reference Figure 1 The present embodiment provides an intelligent double-compensation fiber coupling system, including a base plate 1, a first beam splitter 41, a second beam splitter 42, an industrial camera 32, a four-quadrant detector 33, a power meter 7, a linear displacement platform 31, two piezoelectric deflection mirrors 5, a fiber bracket 6, an acceleration sensor 8, a temperature sensor 10 and a control device.

[0022] The bottom plate 1 is made of aluminum plate, which is good for heat dissipation.

[0023] The industrial camera 32, the four-quadrant detector 33, the linear displacement platform 31, the two piezoelectric deflection mirrors 5, and the optical fiber bracket 6 are all mounted on the bottom plate 1 through a separate supporting substrate 2. The first beam splitter 41, the second beam splitter 42, the acceleration sensor 8, the temperature sensor 10 and the control device are mounted on the bottom plate 1. In addition, a silicon nitride insulation layer is provided between the control device and the bottom plate 1 to reduce the interference of the heat generated by the processor in the control device on the temperature compensation module.

[0024] The linear displacement platform 31 preferably adopts a piezoelectric linear displacement platform 31, and a lens assembly is installed on the linear displacement platform 31. The lens assembly is driven by the linear displacement platform 31 to move back and forth along the optical path direction, so that the waist diameter of the Gaussian beam matches the mode field diameter of the optical fiber, and the application is more diversified.

[0025] The principle of the piezoelectric deflection mirror 5 is a prior art, and will not be described in detail in this embodiment. In addition, a plurality of SMAs are arranged between the reflector of the piezoelectric deflection mirror 5 and the movable table. Figure 3 .

[0026] The fourth support substrate 2 is provided with an optical fiber bracket 6, an optical fiber 61 is provided on the optical fiber bracket 6, and a plurality of SMAs are provided at the mounting contact position. Figure 4 .

[0027] The above-mentioned support substrates 2 are all composed of a stack of heterogeneous materials with different thermal expansion coefficients, and the heterogeneous materials include quartz glass and titanium alloy. The four support substrates 2 can actively produce reverse deformation when the temperature changes (temperature slow change (ΔT<0.1℃ / min)), thereby compensating for the deviation caused by the temperature change. As a preferred method, the ratio of quartz to titanium alloy is 1:1.2.

[0028] The lens assembly, the reflector, the first beam splitter 41, the second beam splitter 42, the optical fiber 61 and the power meter 7 are sequentially spaced according to the preset optical path. Figure 1 The examples shall prevail.

[0029] The SMA mentioned above, whose Chinese name is shape memory alloy, is a kind of smart material. Its length will shrink by nearly 4%, thus generating huge resistance to its thermal drive. SMA adopts a ring-shaped symmetrical layout to make the temperature gradient distribution uniform, avoiding the deflection error of the piezoelectric deflection mirror 5 caused by local thermal stress, and the displacement of the optical fiber 61 on the optical fiber bracket 6. At the same time, a semiconductor refrigerator 9 is also installed on the support substrate 2 where the piezoelectric deflection mirror 5 and the optical fiber bracket 6 are located. The semiconductor refrigerator 9 is used to adjust the temperature of the SMA on the support substrate 2 one by one.

[0030] The above-mentioned linear displacement platform 31, piezoelectric deflection mirror 5, industrial camera 32, four-quadrant detector 33, temperature sensor 10, acceleration sensor 8 and semiconductor refrigerator 9 are all electrically connected to the control device.

[0031] The acceleration sensor 8 is used to monitor vibration and mechanical offset in real time, the industrial camera 32 is used to observe the spot energy distribution of the light beam in real time, the four-quadrant detector 33 is used to monitor the offset of the light beam in real time, and the temperature sensor 10 is used to monitor the ambient temperature change in real time.

[0032] Based on the above system architecture, combined with Figure 5 , this embodiment continues to explain the control process in detail: After initialization, the optical fiber 61 and lens parameters are input to the control device through the interactive terminal. The control device calculates the ideal matrix (ideal Gaussian distribution matrix) of the light spot energy distribution at the position of the industrial camera 32 to control the piezoelectric linear displacement platform 31 to drive the lens assembly to adjust the position so that the light spot energy distribution is close to the ideal matrix. At the same time, the control device also controls the movement of the reflector of the piezoelectric deflection mirror 5 so that the output signal of the four-quadrant detector 33 is located at the calibration position; then the control device continues to fine-tune the piezoelectric deflection mirror 5 according to the output value of the power meter 7 so that the offset of the light beam is less than the expected value; finally, the control device enables the functions of the temperature sensor 10 and the acceleration sensor 8.

[0033] When the temperature sensor 10 detects a change in ambient temperature, the control device predicts the displacement of the end face of the optical fiber 61 due to temperature drift according to a preset temperature-material deformation model (such as ΔL=α·ΔT·L, where α is the thermal expansion coefficient of the material), and uses the predicted value as the compensation reference offset of the piezoelectric deflection mirror 5.

[0034] When a high-frequency vibration signal (such as vibration frequency>100Hz) is detected and responded, the control device simultaneously freezes the active temperature compensation function, that is, it no longer controls the operation of the semiconductor refrigerator 9 based on the output value of the temperature sensor 10, thereby avoiding superimposed interference until the vibration ends. When the vibration frequency is>10Hz, the piezoelectric deflection mirror 5 starts compensation first (piezoelectric ceramic response time<1ms).

[0035] When the temperature suddenly changes (ΔT>1°C / min), the control device controls the semiconductor refrigerator 9 to work based on the output value of the temperature sensor 10, thereby adjusting the temperature of the SMA to cause the SMA to produce a corresponding deformation, so as to adjust the offset of the reflector and the optical fiber 61. At the same time, the control device also enables the piezoelectric deflection mirror 5 to work in coordination (e.g., the SMA compensates for 80% of the displacement, and the remaining 20% ​​is fine-tuned by the piezoelectric deflection mirror 5).

[0036] Of course, the above are only typical examples of the present invention. In addition, the present invention may also have many other specific implementations. All technical solutions formed by equivalent replacement or equivalent transformation fall within the scope of protection required by the present invention.

Claims

1. An intelligent double compensation fiber coupling system, characterized in that: The device comprises a base plate (1), a linear displacement platform (31), two piezoelectric deflection mirrors (5), an optical fiber bracket (6), a temperature sensor (10), an acceleration sensor (8) and a control device; wherein the linear displacement platform (31), at least two piezoelectric deflection mirrors (5) and the optical fiber bracket (6) are all fixed on the base plate (1) via a separate supporting substrate (2); A lens assembly is installed on the linear displacement platform (31); A plurality of SMAs are arranged between the reflector of the piezoelectric deflection mirror (5) and the movable table; An optical fiber (61) is mounted on the optical fiber bracket (6), and a plurality of SMAs are arranged at the mounting contact position; The lens assembly, the reflector and the optical fiber (61) are sequentially spaced and distributed according to a preset optical path; A semiconductor refrigerator (9) is also installed on the support substrate (2) where the piezoelectric deflection mirror (5) and the optical fiber bracket (6) are located; the semiconductor refrigerator (9) is used to adjust the temperature of the SMA on the support substrate (2) on a one-to-one basis; The linear displacement platform (31), the piezoelectric deflection mirror (5), the temperature sensor (10), the acceleration sensor (8) and the semiconductor refrigerator (9) are all electrically connected to the control device.

2. An intelligent double compensation fiber coupling system as claimed in claim 1, characterized in that: The support substrates (2) are all formed by stacking heterogeneous materials with different thermal expansion coefficients, and the heterogeneous materials include quartz glass and titanium alloy.

3. An intelligent double compensation fiber coupling system as claimed in claim 2, characterized in that: The ratio of quartz to titanium alloy is 1:1.

2.

4. The intelligent double compensation fiber coupling system according to claim 1, characterized in that: A first beam splitter (41) is also installed on the base plate (1) on a preset optical path, and an industrial camera (32) is installed on one side of the first beam splitter (41); the second beam splitter (42) is used to split light to the industrial camera (32); and the industrial camera (32) is electrically connected to the control device.

5. The intelligent double compensation fiber coupling system according to claim 1, characterized in that: A second beam splitter (42) is also installed on the base plate (1) on a preset optical path, and a four-quadrant detector (33) is installed on one side of the second beam splitter (42); the second beam splitter (42) is used to split light into the four-quadrant detector (33); and the four-quadrant detector (33) is electrically connected to the control device.

6. The intelligent double compensation fiber coupling system according to claim 1, characterized in that: The linear displacement platform (31) is a piezoelectric linear displacement platform (31).

7. The intelligent double compensation fiber coupling system according to claim 1, characterized in that: A silicon nitride heat insulation layer is provided between the control device and the base plate (1).

8. The intelligent double compensation fiber coupling system according to claim 1, characterized in that: The bottom plate (1) is made of an aluminum plate.

9. The intelligent double compensation fiber coupling system according to claim 1, characterized in that: It also includes a power meter (7), which is located at the end of the optical path and is used to calculate the coupling efficiency of the optical fiber (61); the power meter (7) is electrically connected to the control device.

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