Polarization control optimization method based on extruded optical fiber
By using a polarization control method based on extruded optical fibers, random polarization states are generated using piezoelectric ceramics and the voltage value is monitored in real time. This solves the problem of slow polarization state optimization speed in optical device testing and realizes fast and accurate polarization state testing.
Patent Information
- Application Number
- CN202511431288.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-10-09
- Publication Date
- 2026-02-13
AI Technical Summary
The lack of a targeted polarization state optimization method in the existing technology results in slow testing speed for optical devices and requires traversing a large number of polarization states.
A polarization control method based on extruded optical fiber is adopted. By generating and storing random driving voltage values, a new polarization state is generated by extruding optical fiber with piezoelectric ceramic. Combined with real-time monitoring and comparison of voltage values, the optimal polarization state is quickly found.
It achieves rapid and uniform coverage of the polarization bonding sphere, saves optimization time, improves the speed and accuracy of polarization state testing, and ensures experimental repeatability and system reliability.
Smart Images
Figure CN121521413A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of optoelectronic testing technology, and in particular to a polarization control optimization method based on extruded optical fiber. Background Technology
[0002] With the increasing development of the all-optical industry, the testing of optical device performance on production lines has become a research topic for major manufacturers. Many optical devices are sensitive to the polarization state of light, and other optical performance needs to be tested under the optimal polarization state. Therefore, finding the optimal polarization state corresponding to the device under test is particularly important.
[0003] In the existing technology, there is no specific and systematic optimization method. Generally, the method of full polarization state scanning is used to find the optimal polarization state corresponding to the test object. However, this is not a dedicated optimization method. Moreover, this method requires traversing all the corresponding polarization states on the Bonga spheres at equal intervals, resulting in a large number of polarization states and a slow optimization speed. Summary of the Invention
[0004] To overcome the aforementioned problems in the prior art, this invention proposes a polarization control optimization method based on extruded optical fibers.
[0005] The technical solution adopted by this invention to solve its technical problem is: a polarization control optimization method based on extruded optical fiber, comprising the following steps: Step 1: Generate m sets of random drive voltage values and store the m sets of random drive voltage values in Flash. Step 2: Retrieve the nth set of driving voltage values and use this driving voltage value to drive the piezoelectric ceramic to extrude the optical fiber to generate a new polarization state, where n=1,2…m; Step 3: Find the maximum value of the monitoring voltage and its corresponding driving voltage, and store them in Flash. Step 4: Read the driving voltage corresponding to the maximum voltage value and apply it to the piezoelectric ceramic to test other indicators of the test piece under this optimal polarization state.
[0006] In the above-mentioned polarization control optimization method based on extruded optical fiber, each group of random driving voltages in step 1 contains i driving voltage values, which correspond to i piezoelectric ceramics in the polarization controller.
[0007] In the aforementioned polarization control optimization method based on extruded optical fibers, step 3 specifically comprises: Step 3.1 Read the voltage value monitored by the voltmeter after the light passes through the test link under the nth group of driving voltages. ; Step 3.2: Determine the monitoring voltage value corresponding to the current driving voltage value. Compared with the current maximum monitored voltage value The size, if The current monitored voltage is the maximum. Its corresponding driving voltage sequence number rank=n, otherwise rank = rank, where n = 1, 2, ..., m; Step 3.3: Determine if n is equal to m. If n = m, go to step 3.4. If n is not equal to m, then n = n + 1 and go to step 3.1. Step 3.4, the maximum monitoring voltage value at this time This is the final maximum value of the monitoring voltage, and its corresponding driving voltage rank is the driving voltage rank required to generate the optimal polarization state.
[0008] In the above-mentioned polarization control optimization method based on extruded optical fiber, m is 2000 in step 1.
[0009] The above-mentioned polarization control optimization method based on extruded optical fiber, wherein the test link is specifically as follows: voltage drives piezoelectric ceramic to extrude optical fiber to generate different polarization states, the light source generates different polarization states through a polarization controller, and this polarized light enters the voltmeter to measure the voltage after photoelectric conversion by the device under test, and the different measured voltages correspond to the response of the device under test to different polarization states.
[0010] The beneficial effects of this invention are that it proposes a polarization control optimization method based on extruded optical fibers. This method generates multiple sets of random polarization states that uniformly cover the entire polarization Bonga sphere, allowing the identification of the optimal polarization region. All polarization states within this region meet the testing requirements, saving polarization optimization time and improving the overall optimization speed. Attached Figure Description
[0011] Figure 1 This is a schematic diagram of the test link of the present invention; Figure 2 This is a schematic diagram of the process of this invention. Detailed Implementation
[0012] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
[0013] This embodiment discloses a polarization control optimization method based on extruded optical fiber, the specific process of which is as follows: Figure 2 As shown, it includes the following steps: Step 1: Generate driving voltage The main control module generates 2000 sets of random drive voltage values. Each set of drive voltage contains 4 drive voltage values, which correspond to the 4 piezoelectric ceramics in the polarization controller. The 2000 sets of random drive voltage values are stored in Flash.
[0014] A large number of random voltage combinations are pre-generated to ensure uniform and sufficient sampling in the 4-dimensional voltage space. This greatly increases the probability of scanning for voltage combinations that can produce the globally optimal polarization state (i.e., the dominant polarization state PSP), thus avoiding the algorithm getting trapped in local optima.
[0015] Improving execution efficiency and real-time performance: The time-consuming "random number generation" process is completed before formal testing begins. When the algorithm runs, the main controller only needs to quickly read the pre-stored data from the high-speed Flash memory, without performing real-time calculations. This significantly shortens the control loop time, enabling the system to quickly switch polarization states, thereby accelerating the overall search speed.
[0016] Ensuring experimental reproducibility: Storing the voltage sets in non-volatile memory (Flash) means that the exact same 2000 polarization state sequences can be reproduced in every experiment. This is crucial for experimental verification, debugging, and comparison. If the voltages were randomly generated in real time each time, the experimental results would be unreproducible.
[0017] Reduce system complexity: Separating computation (generating random numbers) from execution (driving hardware) makes the system architecture clearer, the software logic simpler, and easier to maintain.
[0018] Step 2: Find the optimal polarization state Step 2.1: Read the nth set of driving voltage values from the Flash memory. Use this driving voltage value to drive the piezoelectric ceramic to extrude the optical fiber and generate a new polarization state, where n = 1, 2…2000. This achieves a fully automatic closed loop from "reading" to "driving," completely replacing the tedious process of manual adjustment, and is the core of the automated testing system.
[0019] Step 2.2: Find the maximum value of the monitored voltage and its corresponding driving voltage. The specific process is as follows: Step 2.2.1: Read the voltage value monitored by the voltmeter after the light passes through the test link diagram under this driving voltage. The test link is as follows: Figure 1 As shown, the polarization controller in this embodiment is based on the principle of piezoelectric ceramic extrusion of optical fiber. Voltage drives the piezoelectric ceramic to extrude optical fiber to generate different polarization states. The light source generates different polarization states after passing through the polarization controller. This polarized light is converted by photoelectric conversion of the device under test and then enters the voltmeter to measure the voltage. The different voltages measured correspond to the response of the device under test to different polarization states.
[0020] Step 2.2.2: Determine the magnitude of the current driving voltage value and the current maximum monitoring voltage value. If the current monitoring voltage is greater than the current maximum monitoring voltage value, then the current monitoring voltage is the maximum, and its corresponding driving voltage number rank=n. Otherwise, rank=rank, where n=1,2…2000.
[0021] This step is based on the fundamental principle of polarization optics—the dominant polarization state (PSP) is the polarization state in which the output power of an optical pulse is least sensitive to wavelength changes after undergoing polarization mode dispersion (PMD) in an optical fiber. At a fixed wavelength, this typically corresponds to the maximum output optical power (assuming no system gain). Therefore, finding the maximum value of the monitoring voltage is physically the most direct and effective method for finding the PSP.
[0022] Real-time decision-making and low memory overhead: The algorithm employs a "real-time comparison" strategy. It does not need to record all 2000 voltages and their corresponding monitored values, but only needs to maintain two variables in memory: V_max and rank. This significantly saves valuable memory resources (RAM), making it particularly suitable for embedded systems or resource-constrained hardware platforms. The comparison and judgment logic is extremely simple, the code is robust, error-free, and executes very quickly.
[0023] Step 2.2.3: Determine if n is equal to 2000. If n = 2000, proceed to step 2.2.4; otherwise, proceed to step 2.2.1.
[0024] Step 2.2.4: The maximum monitoring voltage value at this time is the final maximum monitoring voltage value, and its corresponding driving voltage rank is the driving voltage rank required to generate the optimal polarization state.
[0025] By exhaustively searching all possible states generated in advance, and by providing a sufficient number of sampling points, the optimal or near-optimal solution found globally is reliable.
[0026] Step 3: Optimal polarization state backtracking The driving voltage corresponding to the rank is read from the Flash and applied to the piezoelectric ceramic to test other parameters of the test piece under this optimal polarization state.
[0027] Piezoelectric ceramics exhibit hysteresis and creep effects. If the algorithm adopts a "record the optimal voltage value and hold it" approach, the voltage may drift slightly due to the characteristics of semiconductor materials, causing a slow change in polarization state. A backtracking (reapplying) approach can counteract this drift, ensuring that each applied voltage value is a precise value re-output from a stable power supply, thus guaranteeing the long-term stability and reproducibility accuracy of the optimal polarization state.
[0028] Single Source of Truth: The optimal state of the entire system is always based solely on the original data stored in Flash memory. This avoids the risk that voltage values stored in memory may be corrupted due to program crashes or interference, making system behavior more reliable and predictable.
[0029] To provide a stable foundation for subsequent testing: Only by conducting tests on other indicators (such as PMD value, loss, etc.) under this stable and optimal polarization state can the accuracy and validity of the test results be guaranteed.
[0030] This embodiment proposes a polarization control optimization method based on extruded optical fiber. This method generates multiple sets of random polarization states uniformly covering the entire polarization Bonga sphere, enabling the identification of the optimal polarization region. All polarization states within this region meet the testing requirements, saving polarization optimization time. The advantages of this method include: specifically addressing the problem of polarization state optimization for optical devices under test; and improving the overall optimization speed.
[0031] The above embodiments are merely exemplary embodiments of the present invention and are not intended to limit the present invention. Those skilled in the art can make various modifications or equivalent substitutions to the present invention within its scope and spirit, and such modifications or equivalent substitutions should also be considered to fall within the scope of protection of the present invention.
Claims
1. A polarization control optimization method based on extruded optical fiber, characterized in that, Includes the following steps: Step 1: Generate m sets of random drive voltage values and store the m sets of random drive voltage values in Flash. Step 2: Retrieve the nth set of driving voltage values and use this driving voltage value to drive the piezoelectric ceramic to extrude the optical fiber to generate a new polarization state, where n=1,2…m; Step 3: Find the maximum value of the monitoring voltage and its corresponding driving voltage, and store them in Flash. Step 4: Read the driving voltage corresponding to the maximum voltage value and apply it to the piezoelectric ceramic to test other indicators of the test piece under this optimal polarization state.
2. The polarization control optimization method based on extruded optical fiber according to claim 1, characterized in that, In step 1, each group of random driving voltages contains i driving voltage values, which correspond to i piezoelectric ceramics in the polarization controller.
3. The polarization control optimization method based on extruded optical fiber according to claim 1, characterized in that, Step 3 specifically involves: Step 3.1 Read the voltage value monitored by the voltmeter after the light passes through the test link under the nth group of driving voltages. ; Step 3.2: Determine the monitoring voltage value corresponding to the current driving voltage value. Compared with the current maximum monitored voltage value The size, if The current monitored voltage is the maximum. Its corresponding driving voltage sequence number rank=n, otherwise rank = rank, where n = 1, 2, ..., m; Step 3.3: Determine if n is equal to m. If n = m, go to step 3.
4. If n is not equal to m, then n = n + 1 and go to step 3.
1. Step 3.4, the maximum monitoring voltage value at this time This is the final maximum value of the monitoring voltage, and its corresponding driving voltage rank is the driving voltage rank required to generate the optimal polarization state.
4. The polarization control optimization method based on extruded optical fiber according to claim 1, characterized in that, In step 1, m is 2000.
5. The polarization control optimization method based on extruded optical fiber according to claim 3, characterized in that, The test link is as follows: voltage drives piezoelectric ceramics to extrude optical fibers to generate different polarization states, the light source generates different polarization states through a polarization controller, and this polarized light enters the voltmeter to measure the voltage after photoelectric conversion by the device under test. The different voltages measured correspond to the response of the device under test to different polarization states.