Optical system of wavelength tunable laser and its testing method

Abstract

The invention relates to the technical field of adjustable light sources, and discloses an optical system of a wavelength tunable laser and a test method thereof. The invention constructs an optical system consisting of a main frame, an excitation component, a resonance component and an output coupler. The resonance component consists of a main resonant cavity and a plurality of auxiliary resonant cavities. The auxiliary resonant cavities are selected to be aligned with the main resonant cavity through a switching mechanism. The main resonant cavity performs preliminary tuning on a laser signal, and each auxiliary resonant cavity further performs auxiliary tuning. Finally, the tuned laser signal is output by the output coupler. The system improves the tuning accuracy of the laser signal and expands the wavelength range through the combined tuning of the main and auxiliary resonant cavities. The switching mechanism ensures the rapid alignment and stability of the auxiliary resonant cavities, improves the flexibility and reliability of the system, and solves the problem of insufficient accuracy of the wavelength tunable laser of a single resonant cavity in the prior art.

Description

Technical Field

[0001] The invention relates to the technical field of adjustable light sources, and in particular to an optical system of a wavelength-tunable laser and a testing method thereof. Background Art

[0002] In modern optical and laser applications, wavelength-tunable lasers have been widely used in various high-precision scenarios, such as spectral analysis, communication, and medical treatment. Wavelength-tunable lasers can adjust the wavelength of the output laser by changing the gain medium or resonant cavity parameters in their optical systems to meet the needs of different applications. Traditional wavelength-tunable lasers generally include a gain medium and a resonant cavity, where the gain medium is used to generate laser light and the resonant cavity is used to tune and stabilize the laser signal.

[0003] Conventional wavelength tunable lasers use a single resonant cavity structure, which can tune the laser signal generated by the gain medium to a certain extent. However, the tuning capability of a single resonant cavity is limited and cannot achieve high-precision wavelength control over a wide wavelength range. Summary of the invention

[0004] The object of the present invention is to provide an optical system of a wavelength tunable laser and a test method thereof, aiming to solve the problem of insufficient precision of a wavelength tunable laser with a single resonant cavity in the prior art.

[0005] The present invention is implemented in this way. In a first aspect, the present invention provides an optical system of a wavelength tunable laser, comprising:

[0006] Main frame, excitation component, resonance component, output coupler;

[0007] The excitation component, the resonance component and the output coupler are sequentially arranged in the main frame;

[0008] The excitation component includes a pump source and a gain medium, wherein the pump source is used to provide energy to the gain medium, and the gain medium is used to receive energy and excite a corresponding laser signal;

[0009] The resonant component includes a main resonant cavity and a plurality of auxiliary resonant cavities, the main resonant cavity is used to perform preliminary tuning processing on the laser signal emitted by the gain medium to obtain a first-degree tuning signal, each of the auxiliary resonant cavities is arranged on the main frame through a switching mechanism, the switching mechanism is used to switch each of the auxiliary resonant cavities to select the auxiliary resonant cavity to be aligned with the main resonant cavity, and the auxiliary resonant cavity in the aligned state is used to perform auxiliary tuning processing on the first-degree tuning signal to obtain a second-degree tuning signal;

[0010] The output coupler is used to output the second-degree tuning signal.

[0011] In a second aspect, the present invention provides a method for testing an optical system of a wavelength tunable laser, which is used to test an optical system of a wavelength tunable laser according to any one of the first aspects, comprising:

[0012] Acquiring performance specifications of the optical system, and calculating a test scheme for the optical system according to the performance specifications to obtain a test scheme for the optical system; wherein the test scheme includes a plurality of test items, and each of the test items corresponds to each of the auxiliary resonant cavities of the optical system;

[0013] According to each of the test items of the test scheme, the auxiliary resonant cavity of the optical system is switched in sequence, so that the auxiliary resonant cavity corresponding to the test item is aligned with the main resonant cavity, and a laser signal tuning test is performed;

[0014] Data is recorded for the switching process of the auxiliary resonant cavity and the laser signal tuning test to obtain system test data, and the system performance of the optical system is analyzed based on the system test data to obtain system performance characteristics; wherein the system performance characteristics are used to provide feedback on the performance of the optical system.

[0015] The present invention provides an optical system of a wavelength tunable laser, which has the following beneficial effects:

[0016] The present invention constructs an optical system consisting of a main frame, an excitation component, a resonance component and an output coupler. The resonance component consists of a main resonance cavity and multiple auxiliary resonance cavities. The auxiliary resonance cavity is selected to be aligned with the main resonance cavity through a switching mechanism. The main resonance cavity performs preliminary tuning on the laser signal, and each auxiliary resonance cavity further performs auxiliary tuning. Finally, the tuned laser signal is output by the output coupler. The system improves the tuning accuracy of the laser signal and expands the wavelength range through the combined tuning of the main and auxiliary resonance cavities. The switching mechanism ensures the rapid alignment and stability of the auxiliary resonance cavities, improves the flexibility and reliability of the system, and solves the problem of insufficient accuracy of the wavelength tunable laser of a single resonance cavity in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic diagram of a foot bone of an optical system of a wavelength tunable laser provided by an embodiment of the present invention;

[0018] Figure 2 It is a schematic diagram of the steps of a method for testing an optical system of a wavelength tunable laser provided by an embodiment of the present invention.

[0019] Figure numerals: 1-main frame, 2-excitation component, 3-resonance component, 4-output coupler, 21-pump source, 22-gain medium, 31-main resonant cavity, 32-auxiliary resonant cavity, 33-switching mechanism. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with 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 intended to limit the present invention.

[0021] The implementation of the present invention is described in detail below in conjunction with specific embodiments.

[0022] Reference Figure 1 , Figure 2 As shown, a preferred embodiment of the present invention is provided.

[0023] In a first aspect, the present invention provides an optical system of a wavelength tunable laser, comprising:

[0024] Main frame 1, excitation component 2, resonance component 3, output coupler 4.

[0025] Specifically, the main frame 1 is the supporting structure of the entire system, accommodating various parts such as the excitation component 2, the resonance component 3, the wavelength selection element and the output coupler 4. It provides stable physical support to ensure that the various components can maintain accurate optical alignment. The stability and accuracy of the main frame 1 are essential to maintaining the overall performance of the laser. By ensuring the accurate position and alignment of each component, the main frame 1 improves the optical efficiency of the system and the tuning accuracy of the resonant cavity.

[0026] More specifically, the excitation component 2 includes a pump source 21 and a gain medium 22. The pump source 21 is the energy source of the laser system, usually an electric pump or an optical pump, and is responsible for inputting external energy into the gain medium 22. The gain medium 22 is a material that can be excited and is used to absorb the energy provided by the pump source 21 and generate stimulated radiation, and then emit laser. The excitation component 2 provides the basis for laser generation. The pump source 21 provides stable and controllable energy input to the gain medium 22. After receiving energy, the gain medium 22 amplifies the laser signal of a specific wavelength. The properties of the gain medium 22 (such as the gain spectrum range and amplification efficiency) determine the wavelength range and power output of the laser.

[0027] More specifically, the resonance component 3 is composed of a main resonance cavity 31 and a plurality of auxiliary resonance cavities 32. The main resonance cavity 31 (such as a rotating grating) is used to perform preliminary wavelength selection and tuning processing on the laser signal generated by the excitation component 2 to obtain a first-degree tuning signal. The auxiliary resonance cavity 32 (such as a fiber Bragg grating) is aligned with the main resonance cavity 31 through a switching mechanism 33 to fine tune the first-degree tuning signal. The function of the main resonance cavity 31 is to preliminarily select and tune the wavelength of the laser and provide a coarse tuning function. The rotating grating can achieve the selection of different wavelengths by changing the angle. The auxiliary resonance cavity 32 provides further fine tuning function and achieves more precise wavelength control through the fiber Bragg grating and the piezoelectric tuning mechanism. The switching mechanism of the auxiliary resonance cavity 32 can adjust the wavelength as needed, expand the tuning range, and provide high-precision output.

[0028] More specifically, the output coupler 4 is an optical element, usually a partial reflector or a beam splitter, which is used to extract the laser signal from the resonant cavity and output the tuned laser signal to the outside. The main function of the output coupler 4 is to extract and output the final tuned laser signal. It needs to precisely control the output power and ensure that the output laser signal maintains a stable wavelength and energy distribution. By optimizing the reflectivity and transmittance of the output coupler 4, the system can achieve higher output power and low loss, thereby improving the overall performance of the laser.

[0029] More specifically, the entire system can achieve a wide and precise wavelength tuning function through multi-stage resonant cavity tuning (main resonant cavity 31 and auxiliary resonant cavity 32) combined with piezoelectric tuning and switching mechanism 33. The design of the system enables it to have a high wavelength tuning range and resolution, which is suitable for different application scenarios, such as optical communication, spectral analysis and other fields. The precise tuning achieved by the piezoelectric tuning mechanism enables the system to have superior performance in wavelength fine-tuning, which is suitable for scenarios requiring high wavelength resolution. The modular design of the switching mechanism 33 improves the flexibility and operability of the system, and can switch freely between different wavelength ranges, making it suitable for a variety of experiments and industrial applications.

[0030] It can be understood that different auxiliary resonant cavities 32 are used to tune laser signals in different ranges, and the tuning performance of the piezoelectric tuning mechanism corresponding to each auxiliary resonant cavity 32 is different. Therefore, each auxiliary resonant cavity 32 has a different advantageous adjustment range. When the optical system is used to emit a laser signal of a specific wavelength, the auxiliary resonant cavity 32 that is most suitable for the target laser signal can be identified, and the auxiliary resonant cavity 32 can be switched to accurately adjust the laser signal to release the most stable and accurate laser signal. Compared with the single resonant cavity in the traditional design, the main resonant cavity 31 plus the auxiliary resonant cavity 32 of the present invention can provide a more accurate laser signal.

[0031] The present invention provides an optical system of a wavelength tunable laser, which has the following beneficial effects:

[0032] The present invention constructs an optical system consisting of a main frame 1, an excitation component 2, a resonance component 3 and an output coupler 4. The resonance component 3 consists of a main resonant cavity 31 and multiple auxiliary resonant cavities 32. The auxiliary resonant cavity 32 is selected to be aligned with the main resonant cavity 31 through a switching mechanism 33. The main resonant cavity 31 performs preliminary tuning on the laser signal, and each auxiliary resonant cavity 32 further performs auxiliary tuning. Finally, the tuned laser signal is output by the output coupler 4. The system improves the tuning accuracy of the laser signal and expands the wavelength range through the combined tuning of the main and auxiliary resonant cavities. The switching mechanism 33 ensures the rapid alignment and stability of the auxiliary resonant cavity 32, improves the flexibility and reliability of the system, and solves the problem of insufficient accuracy of the wavelength tunable laser of a single resonant cavity in the prior art.

[0033] Preferably, the switching mechanism 33 includes a plurality of mounting units, a switching unit and an alignment unit.

[0034] Specifically, the switching mechanism 33 includes a mounting unit, a switching unit and an alignment unit. The mounting unit is used to fix each auxiliary resonant cavity 32. The switching unit is responsible for switching between the auxiliary resonant cavities 32. The alignment unit ensures that optical alignment is maintained during the switching process.

[0035] It can be understood that the function of the switching mechanism 33 is to flexibly select different auxiliary resonant cavities 32 to adjust the output wavelength of the laser. Through precise positioning units, the optical alignment of the auxiliary resonant cavity 32 during the switching process is ensured, thereby ensuring the stability and accuracy of the system output. This switching mechanism enhances the versatility of the system, enabling it to output lasers of different wavelengths according to different application requirements.

[0036] Preferably, the main resonant cavity 31 is a rotating grating, and the auxiliary resonant cavity 32 is a fiber Bragg grating.

[0037] Specifically, each auxiliary resonant cavity 32 has a piezoelectric tuning mechanism of different specifications, and the piezoelectric tuning mechanism is used to physically deform the fiber Bragg grating through a piezoelectric element to achieve tuning processing of the auxiliary resonant cavity, so that the tuned auxiliary resonant cavity can perform auxiliary tuning processing of the first-order tuning signal in different tuning ranges.

[0038] More specifically, the piezoelectric tuning mechanism is used to assist in the tuning of the resonant cavity 32. The mechanism applies stress to the fiber Bragg grating through a piezoelectric element to produce physical deformation, thereby changing the reflection wavelength of the Bragg grating and performing fine wavelength tuning.

[0039] It can be understood that the piezoelectric tuning mechanism provides a precise wavelength tuning method that can achieve fine-tuning of the laser output wavelength and is suitable for application scenarios that require high-precision wavelength selection. Through the physical deformation of the fiber Bragg grating, the system can perform high-resolution tuning within a smaller wavelength range, thereby improving the accuracy and stability of the laser output.

[0040] Reference Figure 2 As shown, in a second aspect, the present invention provides a method for testing an optical system of a wavelength tunable laser, which is used to test an optical system of a wavelength tunable laser as described in any one of the first aspects, comprising:

[0041] S1: Acquire the performance specifications of the optical system, and calculate the test scheme of the optical system according to the performance specifications to obtain the test scheme of the optical system; wherein the test scheme includes a plurality of test items, and each of the test items corresponds to each of the auxiliary resonant cavities 32 of the optical system;

[0042] S2: switching the auxiliary resonant cavity 32 of the optical system in turn according to each test item of the test scheme, so that the auxiliary resonant cavity 32 corresponding to the test item is aligned with the main resonant cavity 31, and performing a laser signal tuning test;

[0043] S3: Recording data of the switching process of the auxiliary resonant cavity 32 and the laser signal tuning test to obtain system test data, and analyzing the system performance of the optical system based on the system test data to obtain system performance characteristics; wherein the system performance characteristics are used to provide feedback on the performance of the optical system.

[0044] Specifically, in step S1 of the present method, performance specification parameters of the optical system are obtained, such as wavelength tuning range, output power, line width, beam quality, noise level and other key indicators, and a reasonable test plan is calculated based on the obtained specification parameters to ensure that all key functions of the system are covered.

[0045] More specifically, the test scheme design includes several test items, each item corresponds to the auxiliary resonant cavity 32 in the system, ensuring that the independent performance of each auxiliary resonant cavity 32 is tested. This step ensures that the test scheme is targeted and comprehensive, laying the foundation for accurate testing of the system. Reasonable design of the test process according to performance specifications can avoid unnecessary test redundancy and improve test efficiency.

[0046] Specifically, in step S2 of the present method, according to the test items in the test scheme, different auxiliary resonant cavities 32 are switched one by one, and it is ensured that the optical alignment state with the main resonant cavity 31 meets the requirements. After each switching is completed, the excitation component 2 (pump source 21 and gain medium 22) generates a laser signal, and tunes it through the main resonant cavity 31 and the corresponding auxiliary resonant cavity 32. The wavelength, power, line width, beam mode and other performance tests of the laser signal are performed for each test item, and the tuning effect is recorded.

[0047] It can be understood that this step ensures the normal function of each resonant cavity by testing the tuning effect of the auxiliary resonant cavity 32 one by one, avoids the degradation of system performance due to resonant cavity switching problems, and accurately records the combined tuning effect of the main resonant cavity 31 and different auxiliary resonant cavities 32, which helps to analyze the overall wavelength tuning performance of the system.

[0048] Specifically, in step S3 of the present method, the switching state of the auxiliary resonant cavity 32 and the laser output data after tuning are recorded in detail in each test item. Based on the test recorded data, a systematic analysis is performed on the performance of the optical system to evaluate the system's performance characteristics such as wavelength tuning range, output power stability, switching speed, and beam quality. The analysis results are compared with predetermined performance specifications to form a performance feedback report for the system, providing a basis for further optimizing the design.

[0049] It can be understood that data recording and analysis ensure that every key performance of the system is tested in detail, and when problems are found, they can be quickly located and solved. The performance feedback report provides a reference for system optimization and provides technical support for subsequent system upgrades and maintenance.

[0050] Preferably, the steps of acquiring performance specifications of the optical system and calculating a test plan for the optical system according to the performance specifications to obtain the test plan for the optical system include:

[0051] S11: Acquiring performance specifications of the excitation component 2 and the resonance component 3 of the optical system to obtain performance characteristics of the excitation component 2 and the resonance component 3 of the optical system;

[0052] S12: analyzing the performance characteristics of the resonance component 3 to obtain the performance characteristics of the main resonance cavity 31 and the performance characteristics of each auxiliary resonance cavity 32;

[0053] S13: analyzing and processing the tuning range of each auxiliary resonant cavity 32 according to the performance characteristics of each auxiliary resonant cavity 32 to obtain the tuning distribution characteristics of each auxiliary resonant cavity 32; wherein the tuning distribution characteristics include a plurality of tuning regions and adaptation parameters corresponding to each tuning region;

[0054] S14: analyzing and processing the test targets of the auxiliary resonant cavities 32 according to the resonance distribution characteristics of the auxiliary resonant cavities 32 to obtain the test targets of the auxiliary resonant cavities 32;

[0055] S15: Perform project expansion processing on the test targets of each of the auxiliary resonant cavities 32 according to the performance characteristics of the excitation component 2 and the performance characteristics of the resonance component 3 to obtain test items corresponding to each of the test targets. The test items together constitute the test plan of the optical system.

[0056] Specifically, the performance specifications of the key components of the optical system (excitation component 2 and resonance component 3) are obtained, and their performance parameters are recorded separately, including the amplification capability of the gain medium 22, the power stability of the pump source 21, the selectivity of the main resonant cavity 31, and the tuning range of the auxiliary resonant cavity 32. The complete performance characteristics of the excitation component 2 and the resonance component 3 are obtained to provide accurate data for the subsequent test plan design, making the test more targeted and accurate.

[0057] More specifically, the performance characteristics of the resonance component 3 are analyzed in detail to determine the core performance of the main resonant cavity 31 (such as wavelength range, reflectivity, etc.) and the tuning range and selectivity of each auxiliary resonant cavity 32. The performance characteristics of the main resonant cavity 31 and the auxiliary resonant cavity 32 are obtained through analysis, making the test design more targeted and helping to optimize the tuning accuracy and stability of the laser.

[0058] More specifically, based on the performance characteristics of each auxiliary resonant cavity 32, its tuning range is further analyzed to determine the wavelength coverage and stability of different resonant cavities in practical applications. This step obtains the tuning distribution characteristics of each auxiliary resonant cavity 32, including multiple tuning areas and their adaptation parameters, which provides a key reference for the specific configuration of the test item and helps to optimize the tuning accuracy of the system.

[0059] More specifically, the tuning areas are divided according to the tuning distribution characteristics, and adaptation parameters are defined for each tuning area, such as wavelength deviation range, frequency response and stability, etc. The different tuning areas of each auxiliary resonant cavity 32 and the corresponding adaptability are clarified, providing support for refined testing and ensuring that the system can be flexibly adapted to different application scenarios.

[0060] More specifically, based on the tuning distribution characteristics of each auxiliary resonant cavity 32, specific test targets are defined for each resonant cavity. For example, these may include boundary detection of the tuning range, stability test of the frequency response, etc. Clear test targets ensure that each auxiliary resonant cavity 32 can be effectively tested within different wavelength ranges, providing clear indicators for subsequent optical system performance evaluation.

[0061] More specifically, the performance characteristics of the excitation component 2 and the resonance component 3 are combined with the test targets of each auxiliary resonant cavity 32, and the project expansion processing is performed on each test target. Finally, the test items for each resonant cavity and the excitation component 2 are obtained, and these items together constitute the test plan of the optical system. The comprehensive test plan covers the performance characteristics of all key components. Through the comprehensive expansion of the test items, the optical system is ensured to be fully and detailedly tested, providing complete support for performance optimization.

[0062] It can be understood that through detailed analysis of the performance characteristics, test objectives and tuning range of each component, it is ensured that the test plan can fully cover the key functions of the system, provide a full range of performance testing, and design test items and test objectives for each auxiliary resonant cavity 32 tuning range, so that the system can be stably and accurately tuned in different applications, thereby improving the overall performance of the optical system. The adaptive parameter setting of each tuning area makes the test plan highly flexible and adaptable, which can meet the needs of different environments and application scenarios and ensure the efficient operation of the system.

[0063] Preferably, the step of analyzing and processing the test target of each auxiliary resonant cavity 32 according to the resonance distribution characteristics of each auxiliary resonant cavity 32 to obtain the test target of each auxiliary resonant cavity 32 includes:

[0064] S141: performing statistical processing on the resonance distribution characteristics of each of the auxiliary resonant cavities 32 to obtain adaptation parameters of each of the tuning regions corresponding to each of the auxiliary resonant cavities 32;

[0065] S142: Compare and process the adaptation parameters of the auxiliary resonant cavities 32 corresponding to the tuning regions, and use the auxiliary resonant cavity 32 corresponding to the best adaptation parameter as the application subject of the tuning region;

[0066] S143: performing combination processing on the respective tuning regions corresponding to the auxiliary resonant cavity 32 as the application subject, so as to obtain the application region of the auxiliary resonant cavity 32;

[0067] S144: analyzing and processing the key test nodes of the auxiliary resonant cavity 32 based on the application area to obtain several key test nodes of the auxiliary resonant cavity 32 , and taking the key test nodes as test targets of the auxiliary resonant cavity 32 .

[0068] Specifically, the resonance distribution characteristics of each auxiliary resonant cavity 32 are statistically analyzed to identify its tuning areas in different wavelengths or frequency ranges, and the adaptation parameters of each area are determined, such as wavelength range, frequency range, signal stability, etc. The statistical processing provides a clear understanding of each tuning area, laying the foundation for the subsequent comparison of adaptation parameters and determination of the application subject.

[0069] More specifically, the adaptation parameters of each tuning area are compared horizontally, and the auxiliary resonant cavity 32 with the best adaptation parameters is screened out, and the resonant cavity is determined as the application subject of the tuning area. By comparing the adaptability of different auxiliary resonant cavities 32 in the same area, the best application subject can be determined, thereby improving the tuning effect and performance stability of the system.

[0070] More specifically, the various tuning areas of the auxiliary resonant cavity 32 determined as the application subject are combined to form their corresponding application areas, so that the resonant cavity can perform optimally in a specific application. The combined application area can provide clear guidance for the role positioning of each auxiliary resonant cavity 32 in the system, ensure the adaptability and consistency of different tuning areas, and improve the tuning effect.

[0071] More specifically, based on each application area, the key test nodes are further analyzed, such as wavelength boundaries, frequency response limits, etc., and these key test nodes are recorded. Clear key test nodes ensure the accuracy of the test plan, focus the test on the highly sensitive area of ​​the resonant cavity, and improve the targeted nature of the test.

[0072] More specifically, the key test nodes of each auxiliary resonant cavity 32 are integrated to form an overall test target for the resonant cavity, providing a clear direction for the tuning performance test of the resonant cavity in the system. After integrating the key test nodes, a clear test target can be formed, making the test more efficient and targeted, and ensuring the core performance of the optical system.

[0073] It can be understood that the best application subject is determined by statistics and comparison of adaptation parameters, ensuring that the tuning area of ​​each auxiliary resonant cavity 32 has high adaptability, improving the accuracy and stability of the overall tuning of the system, and through the combination of application areas and analysis of key nodes, each auxiliary resonant cavity 32 can maintain consistent performance for different applications during the tuning process, ensuring that the optical system has high adaptability in complex application scenarios. The integration of key test nodes provides accurate target positioning for the test of each resonant cavity, resulting in fewer test steps and better results, shortening the test cycle and improving the reliability of the test results.

[0074] Preferably, the step of performing project expansion processing on the test targets of each of the auxiliary resonant cavities 32 according to the performance characteristics of the excitation component 2 and the performance characteristics of the resonance component 3 to obtain the test items corresponding to each of the test targets includes:

[0075] S151: performing an extended analysis of the parameters required for testing the key test nodes on the excitation component 2 according to the performance characteristics of the excitation component 2, so as to obtain the excitation parameters of the excitation component 2 corresponding to each of the key test nodes;

[0076] S152: performing an extended analysis of the parameters required to test the key test nodes of the resonant component 3 according to the performance characteristics of the resonant component 3, so as to obtain the debugging parameters of the resonant component 3 corresponding to each of the key test nodes;

[0077] S153: combining the excitation parameters of the excitation component 2 and the debugging parameters of the resonance component 3 corresponding to the same key test node to obtain the test execution parameters corresponding to the key test node;

[0078] S154: Combining and processing the test execution parameters of the key test nodes corresponding to the same test target to obtain a test item corresponding to the test target.

[0079] Specifically, according to the performance characteristics of the excitation component 2, an extended analysis is performed on each key test node to determine the excitation parameters of the excitation component 2. For example, the power output, pulse width, excitation frequency, etc. of the laser are analyzed to ensure that these parameters can cover the requirements of each key test node. The extended analysis of the excitation parameters can provide accurate excitation conditions for each key test node, improve the accuracy and stability of the test, and ensure efficient excitation within different tuning ranges.

[0080] More specifically, based on the performance characteristics of the resonant component 3, an extended analysis is performed on the parameters required for each key test node to determine the debugging parameters of the resonant component 3. For example, the frequency range, tuning accuracy, bandwidth, etc. of the main resonant cavity 31 and the auxiliary resonant cavity 32 are analyzed to meet the requirements of each key test node. The extended analysis of the debugging parameters makes the test plan more complete and can adapt to the performance requirements of the system in different tuning areas, thereby ensuring the targeted and comprehensive nature of the test.

[0081] More specifically, for the same key test node, the excitation parameters of the excitation component 2 and the debugging parameters of the resonance component 3 are combined to generate the test execution parameters of the key test node. These parameters include specific excitation power, tuning range, frequency response, etc. The combination of excitation parameters and debugging parameters can provide comprehensive condition settings for the test, ensuring that the test execution process of each test node has clear guidance, thereby improving the efficiency and accuracy of the test.

[0082] More specifically, the test execution parameters of each key test node under the same test target are combined to generate a test item for the test target. The test item includes complete test steps, parameter settings and measurement methods. By combining the test execution parameters of each key test node, a highly targeted and comprehensive test item can be formed to ensure a comprehensive evaluation of the performance of the test target.

[0083] It can be understood that, through the parameter expansion analysis and combination processing of the excitation component 2 and the resonance component 3, it is ensured that the test items can cover the needs of each key test node, so that the test plan has high accuracy and operability. The combination of excitation parameters and debugging parameters makes the performance test of the system in different tuning ranges more accurate, optimizes the overall tuning capability of the system, and improves the stability of the optical system. By performing combined analysis on the key nodes of different test targets, it is ensured that the test can cover all important performance areas of the system and achieve a comprehensive evaluation of the optical system. The test items formed by the expansion analysis and parameter combination processing make the test process more targeted, reduce unnecessary test steps, shorten the test cycle, and improve test efficiency.

[0084] Preferably, the steps of switching the auxiliary resonant cavity 32 of the optical system in sequence according to each of the test items of the test scheme, aligning the auxiliary resonant cavity 32 corresponding to the test item with the main resonant cavity 31, and performing a laser signal tuning test include:

[0085] S21: switching the auxiliary resonant cavity 32 of the optical system in turn according to each test item of the test scheme, so that the auxiliary resonant cavity 32 corresponding to the test item is in a preliminary debugging state of alignment with the main resonant cavity 31;

[0086] S22: detecting the degree of alignment of the auxiliary resonant cavity 32 and the main resonant cavity 31, obtaining an alignment vector representing the degree of alignment of the auxiliary resonant cavity 32, and adjusting the auxiliary resonant cavity 32 according to the alignment vector until the alignment vector shows that the auxiliary resonant cavity 32 and the main resonant cavity 31 are in an aligned state;

[0087] S23: Execution parameter configuration is performed on the excitation component 2 and the resonance component 3 according to the test items, so that the excitation component 2 and the resonance component 3 are tested according to the test items.

[0088] Specifically, according to the test items of the test plan, the auxiliary resonant cavity 32 in the optical system is switched item by item, so that the auxiliary resonant cavity 32 specified by each test item is aligned with the main resonant cavity 31. During the switching process, each auxiliary resonant cavity 32 is guided to the test position to ensure that each meets the requirements of the corresponding test item. By switching and adjusting the auxiliary resonant cavity 32, the resonant cavity of each test item can be accurately aligned with the main resonant cavity 31, ensuring the performance stability of the system in each test stage.

[0089] More specifically, after the switching is completed, the degree of alignment between the auxiliary resonant cavity 32 and the main resonant cavity 31 is detected, and the alignment state is quantified by calculating the alignment vector (for example, angle deviation, displacement deviation, etc.). The alignment vector is a key parameter that describes the alignment accuracy of the auxiliary resonant cavity 32 and the main resonant cavity 31. The degree of alignment is detected and quantified to ensure that the auxiliary resonant cavity 32 reaches an ideal alignment state before testing, thereby providing support for the accuracy of the test results.

[0090] More specifically, according to the detected alignment vector, the position, angle and other parameters of the auxiliary resonant cavity 32 are fine-tuned until the alignment vector shows that the auxiliary resonant cavity 32 is completely aligned with the main resonant cavity 31. This process usually requires the use of precision control equipment, such as an electric translation stage or a fine-tuning mechanism, to ensure that the alignment state of the auxiliary resonant cavity 32 is optimal by adjusting the alignment vector, thereby reducing test errors and ensuring the tuning accuracy of the laser signal.

[0091] More specifically, after the auxiliary resonant cavity 32 is aligned, the parameters of the excitation component 2 and the resonant component 3 are configured according to the requirements of the test items. These parameters include the power, frequency, tuning range, spectral width, etc. of the laser, so that the system can perform specific test tasks in the current alignment state. Accurate execution parameter configuration ensures the uniformity of the test conditions and makes the results of each test item comparable and consistent.

[0092] More specifically, after configuring the execution parameters, a laser signal tuning test is performed. During the test, the system response is monitored and the signal characteristics are recorded to ensure that the test process and results meet expectations. The implementation of the laser signal tuning test verifies the performance of the optical system, especially the response under the resonant cavity alignment state, and finally obtains the performance data of each auxiliary resonant cavity 32 under different test items.

[0093] It can be understood that, through alignment detection and vector adjustment, it is ensured that the auxiliary resonant cavity 32 can be efficiently and stably aligned with the main resonant cavity 31, reducing system errors and laying the foundation for subsequent laser signal testing. Accurate alignment and parameter configuration reduce the test error caused by the position deviation of the resonant cavity, making the test results more valuable for reference, which is helpful for the performance optimization and parameter optimization of the optical system. Through precise tuning parameter configuration, the tuning test of the laser signal in each auxiliary resonant cavity 32 can achieve the best effect, thereby improving the spectral response quality of the system. Each test item is executed in sequence, and the resonance adjustment ability of the optical system is gradually optimized, which provides technical guarantee for the adaptability of the system in complex application scenarios. Through the standardized processing of alignment, adjustment, configuration and test steps, a repeatable and verifiable test process is formed, which provides a reliable foundation for the tuning test of the optical system.

[0094] Preferably, the switching process of the auxiliary resonant cavity 32 and the laser signal tuning test are recorded to obtain system test data, and the system performance of the optical system is analyzed according to the system test data to obtain the system performance characteristics, which includes:

[0095] S31: recording data on the alignment accuracy of the auxiliary resonant cavity 32 during the switching process to obtain alignment accuracy characteristics of the auxiliary resonant cavity 32;

[0096] S32: collecting data on the execution effect of the auxiliary resonant cavity 32 when executing the test item, and obtaining the test effect characteristics of the auxiliary resonant cavity 32 corresponding to the test item;

[0097] S33: combining and processing the alignment accuracy feature and the test effect feature of the auxiliary resonant cavity 32 to obtain the project test data of the test item, wherein the project test data of each of the test items together constitute the system test data;

[0098] S34: analyzing the performance characteristics of each of the auxiliary resonant cavities 32 according to the project test data of each of the test items of the system test data, to obtain the unit performance characteristics of each of the auxiliary resonant cavities 32;

[0099] S35: combining the unit performance characteristics of each of the auxiliary resonant cavities 32 to obtain system performance characteristics.

[0100] Specifically, during the switching process of the auxiliary resonant cavity 32, data on its alignment accuracy is recorded. By detecting the deviation angle, displacement, etc. between the auxiliary resonant cavity 32 and the main resonant cavity 31 during switching, alignment accuracy feature data is formed. The alignment accuracy data recording ensures the position accuracy of the auxiliary resonant cavity 32 during switching, reduces error accumulation, and provides a stable alignment basis for each test item.

[0101] More specifically, when executing each test item, data is collected on the execution effect of the auxiliary resonant cavity 32. The data collected includes the frequency response, stability, signal strength, etc. of the signal, so as to obtain the test effect characteristics of the auxiliary resonant cavity 32 in each test item. The collected test effect data can quantify the actual execution effect of each test item, and provide data support for the performance of the auxiliary resonant cavity 32 in actual applications.

[0102] More specifically, for each test item, the alignment accuracy feature of the auxiliary resonant cavity 32 is combined with the test effect feature to generate project test data. The project test data contains complete data on the alignment accuracy and actual execution effect of the auxiliary resonant cavity 32 in each test item. The combined project test data can comprehensively reflect the execution status of each test item and ensure the data relevance and accuracy of each test item.

[0103] More specifically, the project test data of each test item is integrated to form system test data. The system test data contains the test results of all test items and is used for subsequent analysis of the overall performance of the optical system. The generation of system test data ensures the integrity of the test data and provides reliable basic data for optical system performance analysis.

[0104] More specifically, based on the data of each test item in the system test data, a performance characteristic analysis is performed on each auxiliary resonant cavity 32. The analysis content includes the alignment accuracy, frequency response, signal stability, etc. of the auxiliary resonant cavity 32. The unit performance characteristic analysis obtains the characteristic performance of each auxiliary resonant cavity 32 under different test conditions, which helps to identify the advantages and disadvantages of each auxiliary resonant cavity 32.

[0105] More specifically, the unit performance characteristics of each auxiliary resonant cavity 32 are combined to obtain the overall performance characteristics of the optical system, including the system's alignment accuracy range, resonance adjustment capability, signal strength consistency, etc. The integrated system performance characteristics comprehensively reflect the overall performance of the optical system and provide a key reference for the optimal design and application of the system.

[0106] It can be understood that the detailed record of alignment accuracy and test effect data provides complete data support for each test item, ensuring the accuracy and completeness of the test data. By analyzing the alignment accuracy and execution effect of the auxiliary resonant cavity 32, the design and debugging strategy of the system can be further optimized, and the stability and accuracy of the system in practical applications can be improved. Through the unit performance characteristic analysis, the characteristics and limitations of each auxiliary resonant cavity 32 can be deeply identified, providing specific improvement directions for improving the overall performance of the optical system.

[0107] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An optical system of a wavelength tunable laser, characterized in that: include: Main frame, excitation component, resonance component, output coupler; The excitation component, the resonance component and the output coupler are sequentially arranged in the main frame; The excitation component includes a pump source and a gain medium, wherein the pump source is used to provide energy to the gain medium, and the gain medium is used to receive energy and excite a corresponding laser signal; The resonant component includes a main resonant cavity and a plurality of auxiliary resonant cavities, the main resonant cavity is used to perform preliminary tuning processing on the laser signal emitted by the gain medium to obtain a first-degree tuning signal, each of the auxiliary resonant cavities is arranged on the main frame through a switching mechanism, the switching mechanism is used to switch each of the auxiliary resonant cavities to select the auxiliary resonant cavity to be aligned with the main resonant cavity, and the auxiliary resonant cavity in the aligned state is used to perform auxiliary tuning processing on the first-degree tuning signal to obtain a second-degree tuning signal; The output coupler is used to output the second-degree tuning signal; The main resonant cavity is a rotating grating, and the auxiliary resonant cavity is a fiber Bragg grating; Each of the auxiliary resonant cavities has a piezoelectric tuning mechanism of different specifications, and the piezoelectric tuning mechanism is used to physically deform the fiber Bragg grating through a piezoelectric element to achieve tuning processing of the auxiliary resonant cavity, so that the auxiliary resonant cavity that has undergone the tuning processing can perform auxiliary tuning processing of the first-order tuning signal in different tuning ranges.

2. The optical system of the wavelength tunable laser according to claim 1, characterized in that: The switching mechanism includes a plurality of mounting units, a switching unit and an alignment unit; A plurality of the installation units are arranged on the switching unit, each of the installation units is used to respectively arrange each of the auxiliary resonant cavities, and the switching unit is used to perform position switching processing on each of the installation units to select the auxiliary resonant cavity to be aligned with the main resonant cavity; The alignment unit is arranged on the switching unit, and is used for performing an alignment test on the switching process of the switching unit to ensure that the switching unit accurately selects the auxiliary resonant cavity to be aligned with the main resonant cavity through the switching process.

3. A method for testing an optical system of a wavelength tunable laser, used for testing an optical system of a wavelength tunable laser according to any one of claims 1 to 2, characterized in that: include: Acquiring performance specifications of the optical system, and calculating a test scheme for the optical system according to the performance specifications to obtain a test scheme for the optical system; wherein the test scheme includes a plurality of test items, each of which corresponds to each auxiliary resonant cavity of the optical system; According to each of the test items of the test scheme, the auxiliary resonant cavity of the optical system is switched in sequence, so that the auxiliary resonant cavity corresponding to the test item is aligned with the main resonant cavity, and a laser signal tuning test is performed; Data is recorded for the switching process of the auxiliary resonant cavity and the laser signal tuning test to obtain system test data, and the system performance of the optical system is analyzed based on the system test data to obtain system performance characteristics; wherein the system performance characteristics are used to provide feedback on the performance of the optical system.

4. The method for testing an optical system of a wavelength tunable laser according to claim 3, characterized in that: The steps of obtaining the performance specifications of the optical system and calculating the test plan of the optical system according to the performance specifications to obtain the test plan of the optical system include: Acquiring performance specifications of an excitation component and a resonance component of an optical system to obtain performance characteristics of the excitation component and performance characteristics of the resonance component of the optical system; Analyzing the performance characteristics of the resonant component to obtain the performance characteristics of the main resonant cavity and the performance characteristics of each auxiliary resonant cavity; Analyzing and processing the tuning range of each auxiliary resonant cavity according to the performance characteristics of each auxiliary resonant cavity to obtain the tuning distribution characteristics of each auxiliary resonant cavity; wherein the tuning distribution characteristics include a plurality of tuning regions and adaptation parameters corresponding to each tuning region; Performing analysis and processing of test targets on each of the auxiliary resonant cavities according to the resonance distribution characteristics of each of the auxiliary resonant cavities to obtain test targets of each of the auxiliary resonant cavities; According to the performance characteristics of the excitation component and the performance characteristics of the resonance component, the test targets of each auxiliary resonant cavity are expanded to obtain test items corresponding to each test target, and each test item together constitutes a test plan for the optical system.

5. The method for testing an optical system of a wavelength tunable laser according to claim 4, characterized in that: The steps of analyzing and processing the test targets of the auxiliary resonant cavities according to the resonance distribution characteristics of the auxiliary resonant cavities to obtain the test targets of the auxiliary resonant cavities include: Performing statistical processing on the resonance distribution characteristics of each of the auxiliary resonant cavities to obtain adaptation parameters of each of the tuning regions corresponding to each of the auxiliary resonant cavities; Comparing and processing the adaptation parameters of the auxiliary resonant cavities corresponding to the tuning regions, and taking the auxiliary resonant cavity corresponding to the best adaptation parameter as the application subject of the tuning region; Combining the tuning regions corresponding to the auxiliary resonant cavity as the application subject to obtain the application region of the auxiliary resonant cavity; The key test nodes of the auxiliary resonant cavity are analyzed and processed based on the application area to obtain several key test nodes of the auxiliary resonant cavity, and each of the key test nodes is used as a test target of the auxiliary resonant cavity.

6. The method for testing an optical system of a wavelength tunable laser according to claim 5, characterized in that: The step of performing project expansion processing on the test targets of each auxiliary resonant cavity according to the performance characteristics of the excitation component and the performance characteristics of the resonance component to obtain the test items corresponding to each test target includes: Performing an extended analysis on the parameters required for testing the key test nodes on the excitation component according to the performance characteristics of the excitation component, so as to obtain excitation parameters of the excitation component corresponding to each of the key test nodes; Performing an extended analysis of the parameters required for testing the key test nodes of the resonant component according to the performance characteristics of the resonant component, so as to obtain the debugging parameters of the resonant component corresponding to each of the key test nodes; Combining and processing the excitation parameters of the excitation component and the debugging parameters of the resonance component corresponding to the same key test node to obtain the test execution parameters corresponding to the key test node; The test execution parameters of the key test nodes corresponding to the same test target are combined to obtain the test items corresponding to the test target.

7. The method for testing an optical system of a wavelength tunable laser according to claim 3, characterized in that: The steps of switching the auxiliary resonant cavity of the optical system in sequence according to each of the test items of the test scheme, aligning the auxiliary resonant cavity corresponding to the test item with the main resonant cavity, and performing a laser signal tuning test include: According to each of the test items of the test scheme, the auxiliary resonant cavity is sequentially switched on the optical system, so that the auxiliary resonant cavity corresponding to the test item is in a preliminary debugging state of alignment with the main resonant cavity; Detecting the degree of alignment between the auxiliary resonant cavity and the main resonant cavity to obtain an alignment vector representing the degree of alignment of the auxiliary resonant cavity, and adjusting the auxiliary resonant cavity according to the alignment vector until the alignment vector shows that the auxiliary resonant cavity is in an aligned state with the main resonant cavity; The excitation component and the resonance component are configured with execution parameters according to the test items, so that the excitation component and the resonance component are tested according to the test items.

8. The method for testing an optical system of a wavelength tunable laser according to claim 3, characterized in that: The steps of recording data of the switching process of the auxiliary resonant cavity and the laser signal tuning test to obtain system test data, and analyzing the system performance of the optical system according to the system test data to obtain system performance characteristics include: Recording data on the alignment accuracy of the auxiliary resonant cavity during the switching process to obtain alignment accuracy characteristics of the auxiliary resonant cavity; Collecting data on the execution effect of the auxiliary resonant cavity when executing the test item, and obtaining test effect characteristics of the auxiliary resonant cavity corresponding to the test item; Combining and processing the alignment accuracy feature and the test effect feature of the auxiliary resonant cavity to obtain the project test data of the test item, wherein the project test data of each of the test items together constitute the system test data; Analyzing the performance characteristics of each of the auxiliary resonant cavities according to the project test data of each of the test items of the system test data, to obtain unit performance characteristics of each of the auxiliary resonant cavities; The unit performance characteristics of each auxiliary resonant cavity are combined to obtain the system performance characteristics.

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