System capable of carrying out extinction ratio and polarization state comprehensive test
By integrating wave plates, polarization prisms and fiber spectrometers in the same system, combining support mechanisms and stepper motors, comprehensive testing of extinction ratios and polarization states is achieved, the problem of frequent replacement of test equipment in the prior art is solved, the testing efficiency and accuracy are improved, and the cost is reduced.
Patent Information
- Application Number
- CN202422137566.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-31
- Publication Date
- 2025-07-11
- Estimated Expiration
- 2034-08-31
AI Technical Summary
In the prior art, extinction ratio testers and polarization state detectors cannot achieve comprehensive testing of extinction ratio and polarization state, resulting in frequent replacement of test equipment, increasing cost and time, and affecting the continuity and efficiency of the test.
A system is designed, including a horizontal base plate, a wave plate with a coaxial optical path, a polarization prism and a fiber spectrometer, and a first and second support mechanisms for supporting and rotating the wave plate with a polarization prism. Through the cooperation of the support mechanism, a comprehensive test of extinction ratio and polarization state is achieved, and a stepper motor and an electric push rod are used for precise control, and combined with an optical path aligner improves measurement accuracy and stability.
The comprehensive testing of extinction ratio and polarization state is realized on the same device, which reduces the testing cost, improves measurement accuracy and efficiency, reduces the cumbersome process of equipment replacement, and enhances the stability and reliability of the test system.
Smart Images
Figure CN223091491U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the technical field of optical precision instruments, and particularly to a system capable of comprehensively testing extinction ratio and polarization state. Background Art
[0002] In the field of optical measurement, it is often necessary to measure the extinction ratio and polarization state of optical devices or optical systems, etc., in order to understand and evaluate the performance, polarization characteristics, and signal transmission quality of optical systems. This is of great significance for fields such as optical communication, optical research, and laser technology.
[0003] In the prior art, an extinction ratio tester is often used for extinction ratio testing, and a polarization state detector is used for polarization state detection.
[0004] However, traditional testing equipment can usually only perform single extinction ratio or polarization state testing and cannot achieve the integration of the two tests, which brings many inconveniences in practical applications. For example, it is necessary to replace different testing equipment, increasing the testing cost and time, and affecting the continuity and efficiency of testing. Summary of the Utility Model
[0005] In order to facilitate the comprehensive testing of the extinction ratio and polarization state of optical devices or optical systems, this application provides a system capable of comprehensively testing the extinction ratio and polarization state.
[0006] The system capable of comprehensively testing the extinction ratio and polarization state provided by this application adopts the following technical solutions:
[0007] A system capable of comprehensively testing the extinction ratio and polarization state includes a horizontal bottom plate. On the horizontal bottom plate, a wave plate, a polarization prism, and an optical fiber spectrometer with coaxial optical paths are sequentially arranged. A first support mechanism and a second support mechanism are also arranged on the horizontal bottom plate. The first support mechanism is used to support the polarization prism and drive the polarization prism to rotate. The second support mechanism is used to support the wave plate, drive the wave plate to rotate, and move the wave plate out.
[0008] By adopting the above technical scheme, when performing extinction ratio detection on an optical device or an optical system, the wave plate is first moved out of the light path by using the second supporting mechanism to ensure that the light can directly pass through the polarizing prism without obstacles and enter the fiber spectrometer; then the polarizing prism is rotated by the first supporting mechanism, and during the rotation of the polarizing prism, the fiber spectrometer is used to measure the light intensity at different angles respectively; the maximum and minimum values of the light intensity are recorded, and the extinction ratio is calculated; when performing polarization state detection on the optical device or the optical system, the wave plate is accurately moved into the light path by the second supporting mechanism; then the polarizing prism and the wave plate are rotated uniformly and orderly by the first supporting mechanism and the second supporting mechanism respectively; while rotating, the fiber spectrometer measures and records the light intensity and spectrum data at different combination angles in real time; and analyzes and processes these measurement data, such as calculating Stokes parameters, drawing polarization ellipses, etc., so as to accurately analyze the polarization state of the light; in summary, the comprehensive test system can realize the test of extinction ratio and polarization state on the same device, avoids the tediousness of changing equipment as much as possible, reduces the test cost, and can meet different test needs.
[0009] Preferably, a parallel light path aligner is further provided on the horizontal bottom plate, and the parallel light path aligner is located on the side of the wave plate away from the polarizing prism, and the parallel light path aligner is used to assist the light in aligning the wave plate or the polarizing prism.
[0010] By adopting the above technical solution, the parallel optical path aligner can improve the parallelism and accuracy of light before entering the wave plate and the polarization prism, thereby significantly improving the accuracy and reliability of the measurement results.
[0011] Preferably, the first supporting mechanism comprises a first hollow stepping motor, the first hollow stepping motor is fixedly disposed on a horizontal bottom plate, and the polarizing prism is coaxially fixed on an output shaft of the first hollow stepping motor.
[0012] By adopting the above technical solution, the rotation angle and speed of the polarizing prism can be accurately and stably controlled by driving the output shaft of the first hollow stepper motor to rotate; and because the stepper motor has high-precision positioning capability, it can ensure that the angle of each rotation is very accurate, obtain more accurate measurement data, and improve the stability and reliability of the entire test system. The hollow design ensures that light can pass smoothly, minimizing obstruction and influence on the light path.
[0013] Preferably, the second supporting mechanism comprises a second hollow stepping motor, the second hollow stepping motor is arranged on a horizontal bottom plate, and the polarizing prism is coaxially fixed on an output shaft of the second hollow stepping motor.
[0014] By adopting the above technical solution, the second hollow stepping motor can drive the wave plate to rotate precisely and smoothly. Its high-precision control performance ensures the accuracy of the rotation angle of the wave plate, enabling the relative angle between the wave plate and the polarization prism to be precisely adjusted during polarization state detection, thereby obtaining more accurate and comprehensive measurement data. The hollow design ensures that light can pass through smoothly, minimizing the obstruction and influence on the optical path to the greatest extent.
[0015] Preferably, the second hollow stepping motor is horizontally slidably arranged on the horizontal bottom plate, and the sliding direction of the second hollow stepping motor is perpendicular to the optical axis direction of the wave plate.
[0016] By adopting the above technical solution, the horizontal sliding function of the second hollow stepping motor provides greater flexibility for the position adjustment of the wave plate. During the extinction ratio test, the wave plate can be quickly moved out of the optical path through the second hollow stepping motor.
[0017] Preferably, the second support mechanism further includes an electric push rod, which is fixedly arranged on the horizontal bottom plate, and the output shaft of the electric push rod is fixedly connected to the second hollow stepping motor.
[0018] By adopting the above technical solution, the electric push rod can provide a stable and precise horizontal pushing force for the second hollow stepping motor, realizing the rapid and accurate adjustment of the wave plate position. Moreover, its automatic control method improves the convenience and efficiency of operation. During different types of tests, the electric push rod can respond quickly, enabling the wave plate to reach the specified position in time and ensuring the smooth progress of the test process.
[0019] Preferably, a positioning stop rod is fixedly arranged on the horizontal bottom plate, and the positioning stop rod can abut against the side wall of the second hollow stepping motor.
[0020] By adopting the above technical solution, the positioning stop rod can precisely limit the sliding position of the second hollow stepping motor. When the electric push rod pushes the second hollow stepping motor to slide, when the side wall of the second hollow stepping motor abuts against the positioning stop rod, it can ensure that the wave plate reaches the predetermined accurate position, minimizing over-sliding or position deviation, thereby improving the stability of the test system.
[0021] Preferably, a buffer pad is fixedly arranged on the inner side wall of the positioning stop rod.
[0022] By adopting the above technical solution, when the second hollow stepping motor contacts the positioning stop rod, the buffer pad can effectively absorb the impact force generated by the collision, reduce vibration and noise, protect components such as the stepping motor and the wave plate from being damaged by hard impacts, and extend the service life of the equipment.
[0023] In summary, the present application includes at least one of the following beneficial technical effects:
[0024] 1. By setting a wave plate, a polarization prism, and an optical fiber spectrometer with coaxial optical paths, as well as the first and second support mechanisms for supporting and rotating the wave plate and the polarization prism, comprehensive tests of the extinction ratio and polarization state of optical devices or systems are realized on the same device, improving the test efficiency and reducing the cost;
[0025] 2. By setting a parallel optical path aligner to assist the light to accurately align with the wave plate or the polarization prism, the accuracy and reliability of the measurement results are significantly improved, the error caused by the optical path deviation is reduced, and the stability of the test system is enhanced;
[0026] 3. By setting a first hollow stepping motor and a second hollow stepping motor to precisely control the rotation of the polarization prism and the wave plate respectively, and an electric push rod to push the second hollow stepping motor to horizontally slide, cooperating with the positioning stop rod and the buffer pad, precise adjustment of the position and angle of the optical element is realized, ensuring the accuracy and stability of the test process, while reducing the operation difficulty and improving the work efficiency. Description of the Drawings
[0027] Figure 1 It is a schematic structural diagram of a system capable of comprehensively testing the extinction ratio and polarization state provided in an embodiment of the present application.
[0028] Description of the reference numerals: 1, horizontal bottom plate; 2, wave plate; 3, polarization prism; 4, optical fiber spectrometer; 5, parallel optical path aligner; 6, first hollow stepping motor; 7, second hollow stepping motor; 8, electric push rod; 9, positioning stop rod; 91, buffer pad. Detailed Embodiment
[0029] The following will further describe the present application in detail Figure 1 with reference to the accompanying drawings.
[0030] An embodiment of the present application discloses a system capable of comprehensively testing the extinction ratio and polarization state. Referring to Figure 1 , it includes a horizontal bottom plate 1, and a wave plate 2, a polarization prism 3, and an optical fiber spectrometer 4 with coaxial optical paths are sequentially arranged on the horizontal bottom plate 1. The horizontal bottom plate 1 is also provided with a first support mechanism and a second support mechanism. Among them, the first support mechanism is used to support the polarization prism 3 and drive the polarization prism 3 to rotate. The second support mechanism is used to support the wave plate 2, drive the wave plate 2 to rotate, and move the wave plate 2 out of the optical path to meet the requirements of different test modes. In addition, a parallel optical path aligner 5 is also arranged on the horizontal bottom plate 1. The parallel optical path aligner 5 is located on the side of the wave plate 2 away from the polarization prism 3. The parallel optical path aligner 5 is used to assist the light to align with the wave plate 2 or the polarization prism 3, so that the light can maintain a high degree of parallelism and stability before entering the wave plate 2 and the polarization prism 3.
[0031] There are two detection states in this embodiment. In State 1, the light beam sequentially passes through the parallel optical path aligner 5, the wave plate 2, and the polarization prism 3, and is finally captured by the fiber optic spectrometer 4, which is mainly used for polarization state detection. In State 2, the light beam sequentially passes through the parallel optical path aligner 5, the wave plate 2, and the polarization prism 3, and is finally captured by the fiber optic spectrometer 4, which is mainly used for extinction ratio detection. In this way, the measurement of the extinction ratio and the polarization state can be realized on the same device, avoiding the cumbersome process of replacing equipment as much as possible, reducing the test cost, and meeting different test requirements.
[0032] For facilitating the support of the wave plate 2 and driving the wave plate 2 to rotate. Referring to Figure 1 , the first support mechanism includes a first hollow stepping motor 6. The first hollow stepping motor 6 is fixedly installed on the horizontal base plate 1 by bolts, and the polarization prism 3 is coaxially fixed on the output shaft of the first hollow stepping motor 6. The first hollow stepping motor 6 provides a stable power source for the rotation of the polarization prism 3, realizing high-precision control of the angle of the polarization prism 3.
[0033] For facilitating the support of the wave plate 2 and flexibly and accurately driving the wave plate 2 to rotate or move out the wave plate 2, referring to Figure 1 , the second support mechanism includes a second hollow stepping motor 7. The second hollow stepping motor 7 is horizontally slidably arranged on the horizontal base plate 1, and the sliding direction is perpendicular to the optical axis direction of the wave plate 2. The model specifications of the first hollow stepping motor 6 and the second hollow stepping motor 7 are the same. The second support mechanism further includes an electric push rod 8. The electric push rod 8 is fixedly arranged on the horizontal base plate 1, and the output shaft of the electric push rod 8 is fixedly connected to the second hollow stepping motor 7, providing a stable driving force for the sliding of the second hollow stepping motor 7. A positioning stop rod 9 is fixedly arranged on the horizontal base plate 1. The positioning stop rod 9 can abut against the side wall of the second hollow stepping motor 7, thereby limiting the final sliding position of the second hollow stepping motor 7. A buffer pad 91 is fixedly arranged on the inner side wall of the positioning stop rod 9. When the second hollow stepping motor 7 contacts the positioning stop rod 9, the buffer pad 91 can effectively absorb the impact energy, reduce vibration, protect the equipment and improve the stability of the system at the same time.
[0034] The implementation principle of a system for comprehensive measurement of extinction ratio and polarization state according to an embodiment of the present application is as follows: When detecting the extinction ratio of an optical device or an optical system, the electric push rod 8 drives the second hollow stepping motor 7 to slide, and the wave plate 2 is quickly moved out of the optical path. So that the light only enters the polarization prism 3 directly after passing through the parallel optical path aligner 5. Then, the polarization prism 3 is rotated by the first hollow stepping motor 6 in the first support mechanism. At different angles, the change of light intensity is measured by the fiber optic spectrometer 4. The maximum and minimum values of the light intensity are recorded, and thus the extinction ratio is calculated.
[0035] When detecting the polarization state of an optical device or an optical system, the electric push rod 8 is used to drive the second hollow stepping motor 7 to slide, so that the wave plate 2 is moved back into the optical path. The polarization prism 3 is rotated by the first hollow stepping motor 6, and the wave plate 2 is rotated by the second hollow stepping motor 7 to perform different polarization treatments on the light. Combining the rich data measured by the fiber optic spectrometer 4, such as light intensity, wavelength, polarization direction and other information, the polarization state of the light is analyzed to evaluate the polarization characteristics of the optical device or system. Thus, the extinction ratio and the polarization state can be tested on the same device, which avoids the cumbersome process of replacing equipment as much as possible, reduces the test cost, and can meet different test requirements.
[0036] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereby. Therefore, all equivalent changes made according to the structure, shape, and principle of the present application should be covered within the protection scope of the present application.
Claims
1. A system capable of comprehensively testing extinction ratio and polarization state, comprising a horizontal bottom plate (1), characterized in that: The horizontal bottom plate (1) is provided with a wave plate (2) with coaxial optical paths, a polarization prism (3), and a fiber spectrometer (4) in sequence. The horizontal bottom plate (1) is also provided with a first supporting mechanism and a second supporting mechanism. The first supporting mechanism is used to support the polarization prism (3) and drive the polarization prism (3) to rotate, and the second supporting mechanism is used to support the wave plate (2), drive the wave plate (2) to rotate, and move the wave plate (2) out.
2. The system for comprehensively testing extinction ratio and polarization state according to claim 1, characterized in that: A parallel light path aligner (5) is also provided on the horizontal bottom plate (1). The parallel light path aligner (5) is located on the side of the wave plate (2) away from the polarizing prism (3). The parallel light path aligner (5) is used to assist light in aligning the wave plate (2) or the polarizing prism (3).
3. A system for comprehensive testing of extinction ratio and polarization state according to claim 1, characterized in that: The first supporting mechanism comprises a first hollow stepping motor (6), the first hollow stepping motor (6) is fixedly arranged on the horizontal bottom plate (1), and the polarizing prism (3) is coaxially fixed on the output shaft of the first hollow stepping motor (6).
4. A system capable of comprehensively testing extinction ratio and polarization state according to claim 1, characterized in that: The second supporting mechanism comprises a second hollow stepping motor (7), the second hollow stepping motor (7) is arranged on the horizontal bottom plate (1), and the polarizing prism (3) is coaxially fixed on the output shaft of the second hollow stepping motor (7).
5. A system capable of comprehensively testing extinction ratio and polarization state according to claim 4, characterized in that: The second hollow stepping motor (7) is arranged to slide horizontally on the horizontal bottom plate (1), and the sliding direction of the second hollow stepping motor (7) is perpendicular to the optical axis direction of the wave plate (2).
6. A system capable of comprehensively testing extinction ratio and polarization state according to claim 4, characterized in that: The second supporting mechanism further comprises an electric push rod (8), the electric push rod (8) being fixedly arranged on the horizontal bottom plate (1), and the output shaft of the electric push rod (8) being fixedly connected to the second hollow stepping motor (7).
7. A system capable of comprehensively testing extinction ratio and polarization state according to claim 4, characterized in that: A positioning lever (9) is fixedly arranged on the horizontal bottom plate (1), and the positioning lever (9) can abut against the side wall of the second hollow stepping motor (7).
8. A system for comprehensively testing extinction ratio and polarization state according to claim 7, characterized in that: A buffer pad (91) is fixedly arranged on the inner side wall of the positioning lever (9).