Rotating shaft abnormity test system and method based on tunable laser

Abstract

The invention belongs to the technical field of tunable lasers, and particularly relates to a rotating shaft abnormity test system and method based on a tunable laser, and the system comprises a spectrum analyzer, an optical switch, an optical wavelength meter, and a calculation module. The mode-hopping-free tunable laser serves as a testing device, whether the rotating shaft for the tunable laser is abnormal or not is tested, an obtained resonance output wavelength testing result is automatically analyzed, and therefore the optimal tunable output interval which can be achieved by the rotating shaft to be tested is obtained. And on the basis, accurate screening of non-abnormal rotating shafts suitable for tunable laser assembly is realized.

Description

Technical Field

[0001] This application belongs to the field of tunable laser technology, specifically relating to a shaft anomaly testing system and method based on a tunable laser. Background Technology

[0002] Current methods for detecting shaft anomalies often rely on techniques such as finger rotation, temperature monitoring, vibration monitoring, and sound monitoring to test the state parameters of shafts used in tunable lasers. These methods rely on limited data sources and involve complex, inefficient testing processes, posing a risk of significant errors introduced during data analysis and post-processing. Furthermore, these testing methods are divorced from the actual operating environment of tunable lasers, making it difficult to accurately determine the threshold for identifying shaft anomalies. Therefore, common methods are no longer sufficient to meet the needs of shaft anomaly detection in tunable lasers, especially in manufacturing processes operating in complex environments. Summary of the Invention

[0003] In view of this, the present invention proposes a shaft anomaly testing system and method based on a tunable laser, applicable to the accurate screening of non-abnormal shafts assembled with tunable lasers; the technical solution is as follows: A shaft anomaly testing system based on a tunable laser includes a spectrum analyzer, an optical switch, an optical wavelength meter, and a computing module; Optical switch: Used to separate the tunable laser output optical signal from the gain module in a tunable laser; Spectrum analyzer: When the optical switch is in the first channel, the test gain module outputs a spectrum to measure the external cavity mode spacing of the tunable laser; Optical wavelength meter: When the optical switch is in the second channel, test the output wavelength value of the gain module at different positions of the feedback module in the tunable laser; Calculation module: Used for programmable control of the connected gain module, feedback module, optical switch, spectrometer and wavelength meter.

[0004] Preferably, when the optical switch is in the first channel, n peak values ​​are read after a test time T1, where n is an odd number, and (n+1) / 2 is the intermediate peak value, marked as... , The two adjacent peak values ​​on the left are respectively , ; The two adjacent peak values ​​on the right are respectively , Calculate the wavelength differences PL1 and PR1 between two adjacent peaks on the left and right sides, where PL1 = - PR1= - ; Calculate the external cavity mode spacing Mode of the tunable laser, Mode = (PL1 + PR1) / 2.

[0005] Preferably, when the optical switch is in the second channel, the computing unit sends a reset signal Rset1 to the feedback module, and after time T2, it continuously sends step signals to make it move around the pivot point with a travel distance St. The computing unit reads the output wavelength value of the tunable laser, Wave[0~i], under the i*St motion distance in real time, where i is the number of step signals sent. Determine if |Wave[i]-Wave[i-1]| < Mode / p is true. If true, continue reading wavelength values ​​until all i wavelength values ​​have been scanned. Otherwise, the calculation unit sends a stop signal Stop1 to the feedback module. Calculate whether Wave[i]-Wave[i-1]<Mode is true. If it is true, the shaft under test is normal and is adapted to the tunable laser. The achievable tuning output range is Ran, Ran=Wave[i]-Wave[0]. Otherwise, use the peak finding algorithm to find a partial interval adapted to the tunable laser.

[0006] A method for testing shaft anomalies based on a tunable laser includes the following steps: S1. Testing phase; S2. The optical switch is switched to the first channel; S3. The spectrometer begins scanning. During the T1 time period, the start and end wavelengths of the scan are Wstart and Wend, respectively. S4. Calculate the external cavity mode spacing of the tunable laser based on the peak value; S5. The optical switch is switched to the second channel; S6. Use the feedback module to move around the axis point to obtain the output wavelength value of the tunable laser, and use the output wavelength range value to determine whether the axis under test is normal.

[0007] Preferably, the S1. testing phase includes: S101. Calculate the programmable gain module, power it on and preheat it; S102. The calculation module uses a programmable optical switch to switch it to the first channel; S103. Power on and preheat the programmable spectrum analyzer with the calculation module. S104. Calculate the programmable optical wavelength meter module, power it on and preheat it; S105. Calculation module: Programmable spectral analyzer, set its scan start and end wavelengths to Wstart and Wend respectively, and its resolution to Res.

[0008] Preferably, step S4 calculates the external cavity mode spacing of the tunable laser based on the peak value, as follows: S401. After a test time of T1, read n peak values, where n is an odd number, and (n+1) / 2 is the intermediate peak value, marked as... , The two adjacent peak values ​​on the left are respectively , ; The two adjacent peak values ​​on the right are respectively , ; S402. Calculate the wavelength differences PL1 and PR1 between the two adjacent peaks on the left and right sides, respectively, where PL1 = - PR1= - ; S403. Calculate the external cavity mode spacing Mode of the tunable laser, Mode = (PL1 + PR1) / 2.

[0009] Preferably, the S6 determination method is as follows: S601: The calculation unit sends a reset signal Rset1 to the feedback module. After time T2, it continuously sends step signals to make the module move around the pivot point with a travel distance St, and then proceeds to step S602. S602: The calculation unit reads the output wavelength value of the tunable laser, Wave[0~i], under the i*St motion distance in real time, where i is the number of step signals sent, and proceeds to step S603; S603: Determine whether |Wave[i]-Wave[i-1]|<Mode / p is true. If true, go to step S602 until all i wavelength values ​​have been scanned; otherwise, go to step S604. S604: The computing unit sends a stop signal Stop1 to the feedback module, and proceeds to step S605; S605: Calculate whether Wave[i]-Wave[i-1]<Mode is true. If it is true, go to step S606; otherwise, go to step S607. S606: End. The calculation unit gives the test conclusion: The shaft under test is normal and is compatible with the tunable laser. The achievable tuning output range is Ran, Ran = Wave[i] - Wave[0]. S607: Using a peak-finding algorithm, find a specific range that is suitable for the tunable laser.

[0010] Preferably, step S607 involves finding a suitable region for the tunable laser, as follows: S6070: Calculate the absolute value of the difference between adjacent wavelengths in Wave[0~i], generate a new dataset Ab1[0~i-1], and proceed to step S6071; S6071: Using the peak finding algorithm, find the data position P[k] in the dataset Ab1[0~i-1] that is greater than Mode, where k is the number of data that meet the judgment condition. Use the wavelength values ​​of the two endpoints generated by this data as the tuning interval Ran1[jj] that the shaft under test can achieve, where jj is the number of possible intervals. Proceed to step S6072. S6072: Determine whether the maximum value of Ran1[jj] is greater than the threshold Thr. If it is true, proceed to step S6073; otherwise, proceed to step S6074. S6073: End. The calculation unit gives the test conclusion: There is an abnormality in the shaft under test. Some ranges are compatible with tunable lasers. The achievable tunable output range is Ran2, Ran2=max(Ran1[jj]). Proceed to step S6075. S6074: End. The calculation unit gives the test conclusion: The shaft under test has an abnormality and is not suitable for assembly with a tunable laser. Proceed to step S6075. S6075: Replace the shaft under test and repeat steps S5 to S6.

[0011] Compared with the prior art, the beneficial effects of this application are as follows: (1) This invention proposes a method for testing abnormality of rotating shafts based on tunable lasers. Using a non-mode-hopping tunable laser as a testing device, it tests whether the rotating shaft of the tunable laser is abnormal (jamming, damage, or abnormal noise, etc.), and automatically analyzes the test results of the obtained resonant output wavelength to obtain the optimal tunable output range that the rotating shaft under test can achieve. Based on this, it achieves accurate screening of non-abnormal rotating shafts suitable for tunable laser assembly. (2) Compared with conventional testing methods, it has the advantages of being closer to the actual carrier, having explicit judgment thresholds, and high detection accuracy; (3) Further expand the application scope of tunable lasers, increase application scenarios for tunable lasers, and promote the rapid development of the tunable laser industry. Attached Figure Description

[0012] Figure 1 is a schematic diagram of this application. Detailed Implementation

[0013] To better understand the technical solution of this invention, the content of this invention includes, but is not limited to, the specific embodiments described below. Similar technologies and methods should be considered within the scope of protection of this invention. To make the technical problems to be solved, the technical solutions, and advantages of this invention clearer, a detailed description will be provided below in conjunction with the accompanying drawings and specific embodiments.

[0014] It should be understood that the embodiments described in this invention are merely some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without inventive effort are within the scope of protection of this invention.

[0015] This invention proposes a method for testing abnormal shafts in tunable lasers. Using a mode-skipping-free tunable laser as the testing device, it tests for abnormalities (jamming, damage, or unusual noises) in the shafts of the tunable laser. The method automatically analyzes the acquired resonant output wavelength test results to determine the optimal tunable output range achievable by the shaft under test. Based on this, it enables precise screening of non-abnormal shafts suitable for tunable laser assembly. A typical device structure diagram is shown below. Figure 1 As shown, the composition is as follows: Gain module 1 is used to generate the initial broadband signal of the tunable laser and amplify the feedback single-frequency optical signal. Typical devices include InP-based gain chips, semiconductor optical amplifiers, DFBs, or DBRs.

[0016] The beam splitting module 2 is used to shape and diffract the broadband signal emitted from the gain module 2. A typical structure includes a shaping lens, a grating, and a corresponding low thermal expansion coefficient metal support.

[0017] Feedback module 3 is used to reflect the laser beam emitted by the frequency-selective beam splitter 2 back to the active region of gain module 1. It also has the function of rotating around the designed pivot point, thereby realizing the tunability of the output wavelength. The rotation function is realized by the pivot under test.

[0018] Optical switch 4 is used to separate the tunable laser output optical signal of gain module 1, typically a 1*2 optical switch.

[0019] The spectrometer 5, when the optical switch 4 is in the first channel, tests the output spectrum of the gain module 1 to measure the external cavity mode interval of the tunable laser. The tunable laser consists of the gain module 1, the beam splitting module 2, the feedback module 3, and corresponding driving circuits.

[0020] The optical wavelength meter 6 measures the output wavelength value of the gain module 1 at different positions of the feedback module 3 when the optical switch 4 is in the second channel.

[0021] The computing unit uses computer 7 to program the connection of gain module 1, feedback module 3, optical switch 4, spectrometer 5, and wavelength meter 6.

[0022] This invention provides a method for testing shaft anomalies based on a tunable laser, the steps of which are as follows: Step 101: Power on and preheat the computer-controlled gain module, then proceed to step 102.

[0023] Step 102: Use the computer-controlled optical switch to switch it to the first channel, then proceed to step 103.

[0024] Step 103: Power on and preheat the computer-controlled spectrometer, then proceed to step 104.

[0025] Step 104: Power on and preheat the computer-controlled optical wavelength meter, then proceed to step 105.

[0026] Step 105: Set the computer-controlled spectrometer to scan start and end wavelengths Wstart (typical value 1400nm) and Wend (typical value 1700nm) respectively, and the resolution to Res (typical value 5pm). Proceed to step 106.

[0027] Step 106: The computer sends a single scan command to the spectrometer. After a test time T1, n peak values ​​are read, where n is an odd number, and (n+1) / 2 is the intermediate peak value, marked as... , The two adjacent peak values ​​on the left are respectively , ; The two adjacent peak values ​​on the right are respectively , Proceed to step 107.

[0028] Step 107: Calculate the wavelength differences PL1 and PR1 between the two adjacent peaks on the left and right sides, respectively, where PL1 = - PR1= - Proceed to step 108.

[0029] Step 108: Calculate the external cavity mode spacing Mode of the tunable laser; Mode = (PL1 + PR1) / 2, proceed to step 109.

[0030] Step 109: Use the computer-controlled optical switch to switch it to the second channel, then proceed to step 110.

[0031] Step 110: The computer sends a reset signal Rset1 to the feedback module. After time T2, it continuously sends step signals to make the module move around the pivot point at a travel distance St, and then proceeds to step 111.

[0032] Step 111: The computer reads the output wavelength value of the tunable laser, Wave[0~i], under the i*St motion distance in real time, where i is the number of step signals sent. Proceed to step 112.

[0033] Step 112: Determine whether |Wave[i]-Wave[i-1]| < Mode / p (p=10) is true. If true, go to step 111 until all i wavelength values ​​have been scanned; otherwise, go to step 113.

[0034] Step 113: The computer sends a stop signal (Stop1) to the feedback module, proceeding to step 114.

[0035] Step 114: Calculate whether Wave[i] - Wave[i-1] < Mode is true. If it is true, go to step 115; otherwise, go to step 116.

[0036] Step 115: End. The computer gives the test conclusion: The shaft under test is normal and is compatible with the tunable laser. The achievable tuning output range is Ran, Ran = Wave[i] - Wave[0]. Proceed to step 121.

[0037] Step 116: Calculate the absolute value of the difference between adjacent wavelengths in Wave[0~i] to generate a new dataset Ab1[0~i-1], and proceed to step 117.

[0038] Step 117: Using the peak finding algorithm, find the data position P[k] in the dataset Ab1[0~i-1] that is greater than Mode (k is the number of data that meet the judgment condition). Use the two endpoint wavelength values ​​generated by this data as the tuning interval Ran1[jj] that the shaft under test can achieve, where jj is the number of possible intervals. Proceed to step 118.

[0039] Step 118: Determine whether the maximum value of Ran1[jj] is greater than the threshold Thr (typical value 40nm). If it is true, proceed to step 119; otherwise, proceed to step 120.

[0040] Step 119: End. The computer gives the test conclusion: There is an abnormality in the shaft under test. Some ranges are compatible with tunable lasers. The achievable tuning output range is Ran2, Ran2=max(Ran1[jj]). Proceed to step 121.

[0041] Step 120: End. The computer gives the test conclusion: The shaft under test is abnormal and is not suitable for assembly with a tunable laser. Proceed to step 121.

[0042] Step 121: Replace the shaft to be tested and repeat steps 109 to 118.

[0043] Using a mode-skipping tunable laser as a testing device, this method tests for abnormalities (jamming, damage, or unusual noises) in the shafts used in tunable lasers. The acquired resonant output wavelength test results are automatically analyzed to determine the optimal tunable output range achievable by the shaft under test. Based on this, it enables precise screening of non-abnormal shafts suitable for tunable laser assembly. This solves the problem of traditional methods relying on finger rotation, temperature monitoring, vibration monitoring, and sound monitoring for testing the state parameters of tunable laser shafts, which suffer from limited data sources, complex and inefficient testing processes, and the risk of significant errors introduced during data analysis and post-processing. Furthermore, these testing methods are detached from the actual working environment of tunable lasers, making it difficult to accurately determine the threshold for judging whether a shaft is abnormal. This method has significant guiding significance for improving the mass production capacity of tunable lasers, thereby expanding the application scope of tunable lasers, increasing application scenarios, and promoting the rapid development of the tunable laser industry.

[0044] The above embodiments are merely illustrative of the technical concept of the present invention and should not be construed as limiting the scope of protection of the present invention. Any modifications made to the technical solutions based on the technical concept proposed in this invention shall fall within the scope of protection of this invention.

Claims

1. A shaft anomaly testing system based on a tunable laser, characterized in that, Includes a spectrum analyzer, optical switch, wavelength meter, and computing module; Optical switch: Used to separate the tunable laser output optical signal from the gain module in a tunable laser; Spectrum analyzer: When the optical switch is in the first channel, the test gain module outputs a spectrum to measure the external cavity mode spacing of the tunable laser; Optical wavelength meter: When the optical switch is in the second channel, test the output wavelength value of the gain module at different positions of the feedback module in the tunable laser; Calculation module: Used for programmable control of the connected gain module, feedback module, optical switch, spectrometer and wavelength meter.

2. The shaft anomaly testing system based on a tunable laser according to claim 1, characterized in that, When the optical switch is in the first channel, n peak values ​​are read after a test time T1, where n is an odd number, and (n+1) / 2 is the intermediate peak value, marked as... , The two adjacent peak values ​​on the left are respectively , ; The two adjacent peak values ​​on the right are respectively , ; Calculate the wavelength differences PL1 and PR1 between two adjacent peaks on the left and right sides, where PL1 = - PR1= - ; Calculate the external cavity mode spacing Mode of the tunable laser, Mode = (PL1 + PR1) / 2.

3. The shaft anomaly testing system based on a tunable laser according to claim 1, characterized in that, When the optical switch is in the second channel, the computing unit sends a reset signal Rset1 to the feedback module. After time T2, it continuously sends step signals to make it move around the pivot point with a travel distance St. The computing unit reads the output wavelength value of the tunable laser, Wave[0~i], under the i*St motion distance in real time, where i is the number of step signals sent. Determine if |Wave[i]-Wave[i-1]| < Mode / p is true. If true, continue reading wavelength values ​​until all i wavelength values ​​have been scanned. Otherwise, the calculation unit sends a stop signal (Stop1) to the feedback module. Calculate whether Wave[i]-Wave[i-1]<Mode is true. If it is true, the shaft under test is normal and is compatible with the tunable laser. The achievable tuning output range is Ran, Ran=Wave[i]-Wave[0]. Otherwise, a peak-finding algorithm is used to find a specific range that is suitable for the tunable laser.

4. A method for testing shaft anomalies based on a tunable laser, characterized in that, Includes the following steps: S1. Testing phase; S2. The optical switch is switched to the first channel; S3. The spectrometer begins scanning. During the T1 time period, the start and end wavelengths of the scan are Wstart and Wend, respectively. S4. Calculate the external cavity mode spacing of the tunable laser based on the peak value; S5. The optical switch is switched to the second channel; S6. Use the feedback module to move around the axis point to obtain the output wavelength value of the tunable laser, and use the output wavelength range value to determine whether the axis under test is normal.

5. The method for testing shaft anomalies based on a tunable laser according to claim 4, characterized in that, S1. The testing phase includes: S101. Calculate the programmable gain module, power it on and preheat it; S102. The calculation module uses a programmable optical switch to switch it to the first channel; S103. Power on and preheat the programmable spectrum analyzer with the calculation module. S104. Calculate the programmable optical wavelength meter module, power it on and preheat it; S105. Calculation module: Programmable spectral analyzer, set its scan start and end wavelengths to Wstart and Wend respectively, and its resolution to Res.

6. The method for testing shaft anomalies based on a tunable laser according to claim 4, characterized in that, Step S4 calculates the external cavity mode spacing of the tunable laser based on the peak value, as follows: S401. After a test time of T1, read n peak values, where n is an odd number, and (n+1) / 2 is the intermediate peak value, marked as... , The two adjacent peak values ​​on the left are respectively , ; The two adjacent peak values ​​on the right are respectively , ; S402. Calculate the wavelength differences PL1 and PR1 between the two adjacent peaks on the left and right sides, respectively, where PL1 = - PR1= - ; S403. Calculate the external cavity mode spacing Mode of the tunable laser, Mode = (PL1 + PR1) / 2.

7. The method for testing shaft anomalies based on a tunable laser according to claim 4, characterized in that, The S6 determination method is as follows: S601: The calculation unit sends a reset signal Rset1 to the feedback module. After time T2, it continuously sends step signals to make the module move around the pivot point with a travel distance St, and then proceeds to step S602. S602: The calculation unit reads the output wavelength value of the tunable laser, Wave[0~i], under the i*St motion distance in real time, where i is the number of step signals sent, and proceeds to step S603; S603: Determine whether |Wave[i]-Wave[i-1]|<Mode / p is true. If true, go to step S602 until all i wavelength values ​​have been scanned; otherwise, go to step S604. S604: The computing unit sends a stop signal Stop1 to the feedback module, and proceeds to step S605; S605: Calculate whether Wave[i]-Wave[i-1]<Mode is true. If it is true, go to step S606; otherwise, go to step S607. S606: End. The calculation unit gives the test conclusion: The shaft under test is normal and is compatible with the tunable laser. The achievable tuning output range is Ran, Ran = Wave[i] - Wave[0]. S607: Using a peak-finding algorithm, find a specific range that is suitable for the tunable laser.

8. The method for testing shaft anomalies based on a tunable laser according to claim 7, characterized in that, Step S607: Find a suitable region for the tunable laser, as follows: S6070: Calculate the absolute value of the difference between adjacent wavelengths in Wave[0~i], generate a new dataset Ab1[0~i-1], and proceed to step S6071; S6071: Using the peak finding algorithm, find the data position P[k] in the dataset Ab1[0~i-1] that is greater than Mode, where k is the number of data that meet the judgment condition. Use the wavelength values ​​of the two endpoints generated by this data as the tuning interval Ran1[jj] that the shaft under test can achieve, where jj is the number of possible intervals. Proceed to step S6072. S6072: Determine whether the maximum value of Ran1[jj] is greater than the threshold Thr. If it is true, proceed to step S6073; otherwise, proceed to step S6074. S6073: End. The calculation unit gives the test conclusion: There is an abnormality in the shaft under test. Some ranges are compatible with tunable lasers. The achievable tunable output range is Ran2, Ran2=max(Ran1[jj]). Proceed to step S6075. S6074: End. The calculation unit gives the test conclusion: The shaft under test has an abnormality and is not suitable for assembly with a tunable laser. Proceed to step S6075. S6075: Replace the shaft under test and repeat steps S5 to S6.

Images