A device and method for rapid initial wavelength positioning of a tunable laser source

Abstract

The application provides a tunable laser source initial wavelength fast positioning device and method, relates to the field of photoelectric testing technology, and comprises a motor, a light shield plate, a light unit and a light detector array; the output shaft tail end of the motor is connected with the light unit, drives the rotation of the internal reflector of the light unit, and the light unit outputs a wavelength monitoring value in real time; the coaxial light shield plate is arranged on the output shaft of the motor, and the light shield plate moves left and right along with the rotation of the motor; a plurality of photoelectric detectors are arranged on the light detector array, are arranged longitudinally along the output shaft of the motor, and collect photoelectric detection signals of the light detector array; the light shield plate of the application reaches the optical coupling quickly within a limited number of motor rotations, and cooperates with the light detector array to further improve the positioning speed; the wavelength monitoring function is used to monitor whether the initial wavelength is positioned accurately, and the initial wavelength position can be fine-tuned accordingly, so that the initial wavelength positioning precision is further ensured.

Description

Technical Field

[0001] This invention belongs to the field of optoelectronic testing technology, and in particular relates to a device and method for rapid positioning of the initial wavelength of a tunable laser source. Background Technology

[0002] The statements in this section are merely background information related to the present invention and do not necessarily constitute prior art.

[0003] Tunable laser sources are widely used in the 5G industry as the main excitation instruments for optical module testing and wavelength division multiplexing systems. Nowadays, users have increasingly higher requirements for wavelength accuracy, and the initial wavelength positioning accuracy determines the wavelength accuracy. Poor initial wavelength positioning accuracy and long positioning time are common problems of tunable laser sources.

[0004] In the existing technology, the initial wavelength positioning is achieved by a motor driving a light-shielding plate to slowly approach the optocoupler. Although this method can reduce the overshoot caused by the motor and improve the positioning accuracy of the initial wavelength to a certain extent, the positioning speed is too slow and the accuracy is still low, which does not meet the requirements of some users. Furthermore, the existing technology does not take into account the positioning error caused by environmental and other factors.

[0005] Therefore, there is an urgent need for a high-efficiency and accurate device for rapid positioning of the initial wavelength of a tunable laser source, in order to improve the positioning speed and ensure the positioning accuracy of the initial wavelength. Summary of the Invention

[0006] To overcome the shortcomings of the prior art, the present invention provides a device and method for rapid positioning of the initial wavelength of a tunable laser source. The light-shielding plate quickly reaches the optical coupler within a limited number of motor rotations, and the positioning speed is further improved in conjunction with the photodetector array. The wavelength monitoring function is used to monitor whether the initial wavelength is accurately positioned, and the position of the initial wavelength can be finely adjusted accordingly to further ensure the positioning accuracy of the initial wavelength.

[0007] To achieve the above objectives, one or more embodiments of the present invention provide the following technical solutions:

[0008] The first aspect of the present invention provides a device for rapid positioning of the initial wavelength of a tunable laser source;

[0009] A device for rapid positioning of the initial wavelength of a tunable laser source includes a motor, a light shield, an optical unit, and a photodetector array;

[0010] The output shaft of the motor is connected to the optical unit, which drives the reflector inside the optical unit to rotate, and the optical unit outputs the wavelength monitoring value in real time.

[0011] A coaxial light-shielding plate is provided on the output shaft of the motor, and the light-shielding plate moves left and right as the motor rotates;

[0012] The photodetector array has multiple photodetectors mounted on it and arranged longitudinally along the output shaft of the motor to collect photodetector signals from the photodetector array.

[0013] When the motor rotates, the light-shielding plate moves left and right. The relative position of the light-shielding plate and the photodetector array is adjusted using the photodetector on the photodetector array to determine the maximum value of the collected photodetector signal. Based on the wavelength monitoring value of the optical unit, the position of the light-shielding plate at the maximum value is finely adjusted to achieve the final positioning of the initial wavelength.

[0014] A second aspect of the present invention provides a method for rapid positioning of the initial wavelength of a tunable laser source.

[0015] A method for rapid initial wavelength positioning of a tunable laser source, based on a device for rapid initial wavelength positioning of a tunable laser source provided in the first aspect, includes:

[0016] Based on the collected photodetector array photodetector signals, the relative position of the light shield and the photodetector array is determined, and the light shield is moved to the edge of the photodetector array accordingly to coarsely locate the initial wavelength.

[0017] The light-shielding plate moves from the edge of the photodetector array to the inside of the photodetector array, and collects the photoelectric detection signal of the photodetector array in real time during the movement. Based on the maximum value of the photoelectric detection signal, the initial wavelength is precisely located.

[0018] Based on the wavelength monitoring value of the optical unit, the position of the light shield is finely adjusted to accurately locate the initial wavelength.

[0019] Furthermore, determining the relative position of the light-shielding plate and the photodetector array specifically involves:

[0020] If the values ​​of the photodetector array's photoelectric detection signals are all less than the first threshold, then the light-shielding plate is determined to be outside the photodetector array; if the value of any detection signal is greater than the second threshold, then the light-shielding plate is determined to be inside the photodetector array.

[0021] Furthermore, the moving of the light-shielding plate to the edge of the photodetector array specifically involves:

[0022] If the light-shielding plate is in the photodetector array, rotate the motor to move the light-shielding plate out of the photodetector array and obtain the moving distance; if the light-shielding plate is outside the photodetector array, rotate the motor to move the light-shielding plate into the photodetector array and obtain the moving distance.

[0023] Based on the relationship between the moving distance and the third threshold, it is determined whether the light shield is at the edge of the photodetector array. If not, the photoelectric detection signal of the photodetector array is collected again to move the light shield.

[0024] Furthermore, the real-time acquisition of photoelectric detection signals from the photodetector array during movement specifically includes:

[0025] During the movement, the photodetector array photoelectric detection signals are collected at each moment and stored in the photodetector signal array corresponding to each moment.

[0026] Furthermore, the precise positioning of the initial wavelength based on the maximum value of the photoelectric detection signal specifically involves:

[0027] (1) Search for the maximum value of the photoelectric detection signal at each time moment; search for the maximum value of the signal at each time moment from the maximum values ​​of the signal found at all times moment;

[0028] (2) Determine the signal values ​​on both sides of the maximum signal value at the corresponding time, and set the corresponding time of the initial wavelength based on the difference between the maximum signal value and the signal values ​​on both sides.

[0029] Furthermore, the step of setting the corresponding time for the initial wavelength based on the difference between the maximum signal value and the signal values ​​on both sides is specifically as follows:

[0030] Search for the signal values ​​on both sides of the maximum signal value in the photoelectric detection signal array at the moment corresponding to the maximum signal value;

[0031] If the difference between the maximum value and the signal values ​​on both sides is greater than the preset threshold, then the position corresponding to the maximum value of the signal is determined to be the initial wavelength position.

[0032] Otherwise, continue to locate the initial wavelength on both sides of the moment corresponding to the maximum signal value.

[0033] Furthermore, the precise positioning of the initial wavelength specifically involves:

[0034] After obtaining the wavelength monitoring value after fine positioning of the initial wavelength, adjust the position of the light shield to ensure that the difference between the wavelength monitoring value and the initial wavelength threshold is within the set range.

[0035] The above one or more technical solutions have the following beneficial effects:

[0036] The present invention provides a method for rapid initial wavelength positioning of a tunable laser source. The light-shielding plate quickly reaches the optical coupler within a limited number of motor rotations. Combined with a photodetector array and wavelength monitoring function, the initial wavelength positioning accuracy is further improved. The advantages of this method are:

[0037] 1) This method improves the initial wavelength positioning accuracy and reduces positioning time;

[0038] 2) This method has a verification function, which reduces positioning errors caused by environmental and other factors.

[0039] Additional advantages will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0040] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0041] Figure 1 This is a structural diagram of the device according to the first embodiment.

[0042] Figure 2 This is a flowchart of the method in the first embodiment. Detailed Implementation

[0043] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0044] Example 1

[0045] This embodiment discloses a device for rapid positioning of the initial wavelength of a tunable laser source, such as... Figure 1 As shown, it includes a motor, a light shield, a light unit, a photodetector array, LEDs, an AD converter, a processing unit, etc.

[0046] The output shaft of the motor is connected to the optical unit, which drives the reflector inside the optical unit to rotate, adjusting the output wavelength of the light source of the optical unit. That is, the optical unit outputs the wavelength monitoring value in real time, which is used to calibrate the initial wavelength position and complete the rapid and accurate positioning of the initial wavelength.

[0047] A coaxial light-shielding plate is installed on the output shaft of the motor. When the motor rotates, the coaxial light-shielding plate will move left and right as the motor rotates.

[0048] The LED serves as the source for the photodetector array. The photodetector array is equipped with multiple photodetectors. In this embodiment, 25 photodetectors are set longitudinally along the output shaft of the motor to collect the photodetector array's photodetector signals. When the light shield enters the photodetector array, the power values ​​detected by the 25 photodetectors on the photodetector array will change. The initial wavelength of the laser source is located using all the detected power values.

[0049] The function of AD is to convert the analog electrical signals generated by the photodetector into digital signals for processing by the CPU.

[0050] When the motor rotates, the light-shielding plate moves left and right. The relative position of the light-shielding plate and the photodetector array is adjusted by the photodetector on the photodetector array to determine the maximum value of the collected photodetector signal. Based on the wavelength monitoring value of the optical unit, the position of the light-shielding plate at the maximum value is finely adjusted to achieve the final positioning of the initial wavelength.

[0051] Example 2

[0052] This embodiment discloses a method for rapid initial wavelength localization of a tunable laser source;

[0053] like Figure 2 As shown, a method for rapid initial wavelength positioning of a tunable laser source, based on a device for rapid initial wavelength positioning of a tunable laser source disclosed in Embodiment 1, includes:

[0054] Step S1: Based on the acquired photodetector array photodetector signal, determine the relative position of the light shield and the photodetector array, and move the light shield to the edge of the photodetector array accordingly to perform coarse positioning of the initial wavelength.

[0055] Step S101: Acquisition of photoelectric detection signals from the photodetector array

[0056] Acquire photoelectric detection signals [s1,s2,…,s] from the photodetector array n ], where s i Let n be the signal detected by the i-th photodetector, where n = 25;

[0057] Step S102: Determine the relative position of the light-shielding plate and the photodetector array.

[0058] If any detection signal s i The values ​​of (i = 1, 2, ..., 25) are all less than the first threshold. In this embodiment, the first threshold is set to -60dBm. Therefore, it is determined that the light-shielding plate is outside the photodetector array. If there is a detection signal s i If the value of (i = 1, 2, ..., 25) is greater than the second threshold, and the second threshold is set to -40dBm in this embodiment, then it is determined that the light shield is in the photodetector array;

[0059] Step S103: Move the light shield to the edge of the photodetector array.

[0060] If the light-shielding plate is currently within the photodetector array, the motor is rotated to move the light-shielding plate out of the photodetector array by a distance of x; if the light-shielding plate is currently outside the photodetector array, the motor is rotated to move the light-shielding plate into the photodetector array by a distance of x; in this embodiment, the initial value of x is 30mm.

[0061] Determine the distance x and the third threshold x sThe size of x, in this embodiment the third threshold is set to 1, if x <x s If the light-shielding plate is located at the edge of the photodetector array, then proceed to step S2. If x ≥ x s Then reset the movement distance. Then proceed to step S101.

[0062] Step S2: The light-shielding plate moves from the edge of the photodetector array to the inside of the photodetector array, and collects the photoelectric detection signal of the photodetector array in real time during the movement. Based on the maximum value of the photoelectric detection signal, the initial wavelength is precisely located.

[0063] Step S201: The light-shielding plate enters the photodetector array.

[0064] The light-shielding plate moves from the edge of the photodetector array to inside the photodetector array; and during the movement, it collects the photoelectric detection signal array of the photodetector array in real time [s]. 1m ,s 2m …,s nm ], where s im Let n be the signal detected by the i-th detector at time m, where n = 25, m = 1, 2, ...;

[0065] Step S202: Locate the initial wavelength

[0066] (1) For the photoelectric detection signal array [s] at time m 1m s 2m ..., s nm Perform a maximum value search to find the maximum value s of the signal at time m. m ;

[0067] (2) The maximum value s of the signal found at all times m Perform a maximum value search to find the maximum value s of the signal. max The corresponding time is y, where y = 1, 2, ...;

[0068] (3) Search for s in the array of time y. max The values ​​s on both sides max1 and s max2 If; s max -s max1 >S s And s max -s max2 >S s If the position corresponding to y at that moment is determined to be the initial wavelength point, then proceed to step S3; otherwise, proceed to step (4). In this embodiment, S... s =0.1dB, y=1, 2..., m.

[0069] The values ​​on both sides represent the two sides in time; if the maximum value is s... yThe values ​​on both sides are s at time y-1. y s at times -1 and y+1 y+1 .

[0070] (4) Let y = y-1 or y = y+1, and search for the maximum signal value s in the detector signal array corresponding to the new time y. y .

[0071] Step S3: Based on the wavelength monitoring value of the optical unit, fine-tune the position of the light shield to accurately locate the initial wavelength.

[0072] Obtain the wavelength monitoring value W after initial wavelength fine positioning. r Determine the wavelength monitoring value W r Compared with the initial wavelength setting value W s Are they the same? If |W r -W s |<W t If the current position is determined to be the initial wavelength point, the positioning is complete; if |W r -W s |≥W t Then move the light-shielding plate, when |W r -W s |<W t Stop moving, determine the corresponding time y and the maximum value s of the probe signal array at time y. y , making s max =s y Then proceed to step S202. In this embodiment, W t =10pm.

[0073] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A device for rapid positioning of the initial wavelength of a tunable laser source, characterized in that, Includes motors, light shields, optical units, and photodetector arrays; The output shaft of the motor is connected to the optical unit, which drives the reflector inside the optical unit to rotate, and the optical unit outputs the wavelength monitoring value in real time. A coaxial light-shielding plate is provided on the output shaft of the motor, and the light-shielding plate moves left and right as the motor rotates; The photodetector array has multiple photodetectors mounted on it and arranged longitudinally along the output shaft of the motor to collect photodetector signals from the photodetector array. When the motor rotates, the light-shielding plate moves left and right. The relative position of the light-shielding plate and the photodetector array is adjusted using the photodetector on the photodetector array to determine the maximum value of the collected photodetector signal. Based on the wavelength monitoring value of the optical unit, the position of the light-shielding plate at the maximum value is finely adjusted to achieve the final positioning of the initial wavelength.

2. A method for rapid initial wavelength positioning of a tunable laser source, characterized in that, A rapid initial wavelength positioning device for a tunable laser source as described in claim 1 includes: Based on the collected photodetector array photodetector signals, the relative position of the light shield and the photodetector array is determined, and the light shield is moved to the edge of the photodetector array accordingly to coarsely locate the initial wavelength. The light-shielding plate moves from the edge of the photodetector array to the inside of the photodetector array, and collects the photoelectric detection signal of the photodetector array in real time during the movement. Based on the maximum value of the photoelectric detection signal, the initial wavelength is precisely located. Based on the wavelength monitoring value of the optical unit, the position of the light shield is finely adjusted to accurately locate the initial wavelength.

3. The method for rapid initial wavelength positioning of a tunable laser source as described in claim 2, characterized in that, The determination of the relative position between the light-shielding plate and the photodetector array specifically involves: If the values ​​of the photodetector array's photoelectric detection signals are all less than the first threshold, then the light-shielding plate is determined to be outside the photodetector array; if the value of any detection signal is greater than the second threshold, then the light-shielding plate is determined to be inside the photodetector array.

4. The method for rapid initial wavelength positioning of a tunable laser source as described in claim 3, characterized in that, The moving light-shielding plate to the edge of the photodetector array specifically refers to: If the light-shielding plate is in the photodetector array, rotate the motor to move the light-shielding plate out of the photodetector array and obtain the moving distance; if the light-shielding plate is outside the photodetector array, rotate the motor to move the light-shielding plate into the photodetector array and obtain the moving distance. Based on the relationship between the moving distance and the third threshold, it is determined whether the light shield is at the edge of the photodetector array. If not, the photoelectric detection signal of the photodetector array is collected again to move the light shield.

5. The method for rapid initial wavelength positioning of a tunable laser source as described in claim 4, characterized in that, The first threshold is set to -60dBm, the second threshold is set to -40dBm, and the third threshold is set to... .

6. The method for rapid initial wavelength positioning of a tunable laser source as described in claim 2, characterized in that, The real-time acquisition of photoelectric detection signals from the photodetector array during movement specifically includes: During the movement, the photodetector array photoelectric detection signals are collected at each moment and stored in the photodetector signal array corresponding to each moment.

7. The method for rapid initial wavelength positioning of a tunable laser source as described in claim 2, characterized in that, The method of finely locating the initial wavelength based on the maximum value of the photoelectric detection signal is as follows: (1) Search for the maximum value of the photoelectric detection signal at each time moment; search for the maximum value of the signal at each time moment from the maximum values ​​of the signal found at all times moment; (2) Determine the signal values ​​on both sides of the maximum signal value at the corresponding time, and set the corresponding time of the initial wavelength based on the difference between the maximum signal value and the signal values ​​on both sides.

8. The method for rapid initial wavelength positioning of a tunable laser source as described in claim 7, characterized in that, The step of setting the corresponding time for the initial wavelength based on the difference between the maximum signal value and the signal values ​​on both sides is as follows: Search for the signal values ​​on both sides of the maximum signal value in the photoelectric detection signal array at the moment corresponding to the maximum signal value; If the difference between the maximum value and the signal values ​​on both sides is greater than the preset threshold, then the position corresponding to the maximum value of the signal is determined to be the initial wavelength position. Otherwise, continue to locate the initial wavelength on both sides of the moment corresponding to the maximum signal value.

9. The method for rapid initial wavelength positioning of a tunable laser source as described in claim 8, characterized in that, The step of continuing to locate the initial wavelength on both sides of the moment corresponding to the maximum signal value is as follows: If the time corresponding to the maximum signal value is y, then we take both sides of the time corresponding to the maximum signal value, that is, let y = y-1 or y = y+1, and search for the maximum signal value in the detection signal array corresponding to the new time y. , The corresponding position is the initial wavelength position.

10. The method for rapid initial wavelength positioning of a tunable laser source as described in claim 2, characterized in that, The precise positioning of the initial wavelength specifically refers to: After obtaining the wavelength monitoring value after fine positioning of the initial wavelength, adjust the position of the light shield to ensure that the difference between the wavelength monitoring value and the initial wavelength threshold is within the set range.

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