Micro-ring resonant wavelength locking method and device, equipment and storage medium

Abstract

The invention discloses a micro-ring resonant wavelength locking method, device and equipment and a storage medium, and relates to the technical field of resonant wavelength locking, and the method comprises the steps: obtaining an initial power search range corresponding to a micro-ring heater; performing preset equal difference comparison on the initial power search range based on a preset power difference value to obtain optimized heating power; determining a target error signal according to a preset perturbation signal and the optimized heating power; and determining the locking direction of the resonant wavelength corresponding to the target micro-ring based on the target error signal. According to the method, the threshold value of the optical signal difference is set and the optical signal difference value is compared, so that the optimal heating power is gradually reduced and quickly determined, and the optimal heating power search range is obtained; and then, in the optimal heating power search range, determining the adjustment direction of the power of the micro-heater by using a perturbation technology and the target error signal, and accurately locking the resonant wavelength of the micro-ring at the target wavelength. Therefore, the micro-ring resonant wavelength can be quickly and accurately locked.

Description

Technical Field

[0001] The present application relates to the technical field of resonant wavelength locking, and in particular to a micro-ring resonant wavelength locking method, device, equipment and storage medium. Background Art

[0002] Microring is a basic optical unit with important applications in lasers, amplifiers, sensors, modulation, switches, etc. It can realize many functions and has the potential for large-scale integration. It is regarded as a key unit for realizing large-scale photonic integration. Due to various reasons such as unknown ambient temperature or light source signal wavelength, the resonant wavelength of the microring and the target working wavelength, such as the laser light signal wavelength, are often inconsistent.

[0003] In order to solve the problem of the micro-ring resonant wavelength offsetting the target working wavelength, a common method is to gradually increase the micro-heater power with a certain step size until the heater working range is covered, and by comparing the value of the through-end optical signal, the micro-heater working power corresponding to the minimum optical signal value is found. This heating power is the current optimal heating power that can adjust the micro-ring resonant wavelength to the target working wavelength. The disadvantage of this method is that if the step size is set too small, the search will take a long time; if the step size is set too large, the optimal heating power value corresponding to the resonance peak may be skipped, that is, the existing scheme is almost difficult to achieve the optimal search speed and accuracy at the same time.

[0004] Therefore, how to quickly and accurately lock the microring resonant wavelength has become an urgent problem to be solved. Summary of the invention

[0005] The main purpose of the present application is to provide a method, device, equipment and storage medium for locking the micro-ring resonance wavelength, aiming to solve the technical problem of how to quickly and accurately lock the micro-ring resonance wavelength.

[0006] To achieve the above object, the present application proposes a microring resonant wavelength locking method, the method comprising: obtaining an initial power search range corresponding to a microring heater;

[0007] Performing a preset arithmetic comparison on the initial power search range based on a preset power difference to obtain an optimized heating power;

[0008] Determining a target error signal according to a preset perturbation signal and the optimized heating power;

[0009] The locking direction of the resonant wavelength corresponding to the target microring is determined based on the target error signal.

[0010] In one embodiment, the step of determining the target error signal according to the preset perturbation signal and the optimized heating power comprises:

[0011] generating a perturbation driving signal according to a preset perturbation signal and the optimized heating power;

[0012] A target error signal is determined based on the real-time optical signal output by the target microring port and the perturbation driving signal.

[0013] In one embodiment, the step of performing a preset arithmetic comparison on the initial power search range based on the preset power difference to obtain the optimized heating power includes:

[0014] Determine an initial arithmetic progression according to an initial search upper limit and an initial search lower limit corresponding to the initial power search range;

[0015] Heating the target microring based on the initial arithmetic progression, and obtaining an initial optical signal array outputted corresponding to a port of the target microring;

[0016] Determining an optimized search range according to the initial optical signal array, and judging whether a boundary power difference value corresponding to the optimized search range is less than a preset power difference value;

[0017] If so, the optimal heating power corresponding to the optimization search range is used as the optimized heating power.

[0018] In one embodiment, the step of determining the optimized search range according to the initial optical signal array comprises:

[0019] Traversing the initial optical signal array to determine a minimum optical signal in the initial optical signal array;

[0020] Determining the heating power value corresponding to the minimum light signal as the reference heating power;

[0021] An optimization search range is determined based on the reference heating power.

[0022] In one embodiment, after determining whether the boundary power difference value corresponding to the optimization search range is less than the preset power difference value, the method further includes:

[0023] If not, reconstructing the arithmetic progression is determined according to the optimized search range;

[0024] Obtaining a reconstructed optical signal array corresponding to the reconstructed arithmetic progression to determine a reconstruction search range;

[0025] Return to the step of determining whether the boundary power difference value corresponding to the optimized search range is less than the preset power difference value, and update the optimized search range based on the reconstructed search range until it is detected that the boundary power difference value corresponding to the optimized search range is less than the preset power difference value.

[0026] In one embodiment, the step of determining the target error signal based on the real-time optical signal output by the target microring port and the perturbation driving signal comprises:

[0027] Determine a periodic power signal based on a real-time optical signal output by a target microring port and the perturbation driving signal;

[0028] The periodic power signal is subjected to high frequency filtering to obtain a target error signal.

[0029] In one embodiment, the step of determining the locking direction of the resonant wavelength corresponding to the target microring based on the target error signal includes:

[0030] Obtaining a current signal polarity corresponding to the target error signal;

[0031] Obtaining a target port type corresponding to the target microring port;

[0032] The locking direction of the resonant wavelength corresponding to the target microring is determined according to the current signal polarity and the target port type.

[0033] In addition, to achieve the above-mentioned purpose, the present application also proposes a micro-ring resonance wavelength locking device, the micro-ring resonance wavelength locking device comprising:

[0034] A range determination module, used to obtain an initial power search range corresponding to the micro-ring heater;

[0035] A coarse search module, used for performing a preset arithmetic comparison on the initial power search range based on a preset power difference value to obtain an optimized heating power;

[0036] An error determination module, used to determine a target error signal according to a preset perturbation signal and the optimized heating power;

[0037] The wavelength locking module is used to determine the locking direction of the resonant wavelength corresponding to the target microring based on the target error signal.

[0038] In addition, to achieve the above-mentioned purpose, the present application also proposes a micro-ring resonance wavelength locking device, the device comprising: a memory, a processor, and a micro-ring resonance wavelength locking program stored in the memory and executable on the processor, the micro-ring resonance wavelength locking program being configured to implement the steps of the micro-ring resonance wavelength locking method as described above.

[0039] In addition, to achieve the above-mentioned purpose, the present application also proposes a storage medium, which is a storage medium on which a micro-ring resonance wavelength locking program is stored. When the micro-ring resonance wavelength locking program is executed by a processor, the steps of the micro-ring resonance wavelength locking method as described above are implemented.

[0040] The present application provides a method, device, equipment and storage medium for locking a micro-ring resonant wavelength. The method includes: obtaining an initial power search range corresponding to a micro-ring heater; performing a preset arithmetic comparison on the initial power search range based on a preset power difference to obtain an optimized heating power; determining a target error signal based on a preset perturbation signal and the optimized heating power; and determining a locking direction of a resonant wavelength corresponding to a target micro-ring based on the target error signal. Compared with the existing step-by-step comparison method for locking a micro-ring resonant wavelength, the present application proposes a method for locking a micro-ring resonant wavelength based on a combination of an equal division comparison method and a perturbation technique. The micro-ring wavelength locking process of the present application is divided into two major steps. The first step is coarse alignment. The present application gradually narrows down and quickly determines the optimized heating power by setting a threshold of an optical signal difference and comparing the optical signal difference, that is, obtaining an optimal heating power search range; the second step is fine alignment. In the coarse alignment stage, the approximate range where the optimal heating power is located has been found. In this local range, the micro-heater power adjustment direction is determined using the perturbation technique and the target error signal. Then, on the basis of optimizing the heating power, the heating power is increased or decreased according to the determined adjustment direction, and the micro-ring resonant wavelength is gradually accurately locked at the target wavelength. Therefore, the present application can quickly and accurately lock the microring resonant wavelength. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0042] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0043] Figure 1 This is a first flow chart of the first embodiment of the micro-ring resonance wavelength locking method of the present application;

[0044] Figure 2 A schematic diagram of the working principle of a micro-ring according to the first embodiment of the micro-ring resonance wavelength locking method of the present application;

[0045] Figure 3 The transmission spectrum of the micro-ring through end of the first embodiment of the micro-ring resonance wavelength locking method of the present application;

[0046] Figure 4 This is a second flow chart of the first embodiment of the micro-ring resonance wavelength locking method of the present application;

[0047] Figure 5 This is a third flow chart of the first embodiment of the micro-ring resonance wavelength locking method of the present application;

[0048] Figure 6 This is a schematic diagram of a coarse search process of the first embodiment of the micro-ring resonance wavelength locking method of the present application;

[0049] Figure 7 This is a flow chart of the second embodiment of the micro-ring resonance wavelength locking method of the present application;

[0050] Figure 8 The transmission spectra of the micro-ring through-end under different heating powers of the second embodiment of the micro-ring resonance wavelength locking method of the present application;

[0051] Fig. 9 This is a schematic diagram of the module structure of the micro-ring resonant wavelength locking device according to an embodiment of the present application;

[0052] Fig.10 Schematic diagram of the device structure of the hardware operating environment involved in the micro-ring resonance wavelength locking method in the embodiment of the present application.

[0053] The purpose, features and advantages of this application will be further described in conjunction with the embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0054] It should be understood that the specific embodiments described herein are only used to explain the technical solutions of the present application and are not used to limit the present application.

[0055] In order to better understand the technical solution of the present application, a detailed description will be given below in conjunction with the accompanying drawings and specific implementation methods.

[0056] The main solution of this application is: to obtain the initial power search range corresponding to the microring heater; to perform a preset arithmetic comparison on the initial power search range based on a preset power difference to obtain the optimized heating power; to determine the target error signal based on the preset perturbation signal and the optimized heating power; and to determine the locking direction of the resonant wavelength corresponding to the target microring based on the target error signal.

[0057] At present, in order to solve the problem of the microring resonant wavelength offsetting the target working wavelength, the more common method is to change the thermo-optical or electro-optical characteristics of the microring by adjusting the integrated microheater on the microring or the microring bias voltage, thereby adjusting the microring resonant wavelength. Generally, the microring resonant wavelength is judged to be aligned with the light source signal wavelength by monitoring system parameters such as optical signal and temperature. The most direct solution is to gradually increase the microheater power with a certain step size until the heater working range is covered. By comparing the value of the through-end optical signal, the microheater working power corresponding to the minimum optical signal value is found. The heating power is the current optimal heating power that can adjust the microring resonant wavelength to the target working wavelength. This process of finding the optimal heating power can be regarded as the process of searching for the microring resonant wavelength. However, the disadvantage of this method is that if the step size is set too small, the search will take a long time; if the step size is set too large, the optimal heating power value corresponding to the resonance peak may be skipped. The disadvantage of this method is that it is almost difficult to achieve the optimal search speed and accuracy at the same time.

[0058] Therefore, in order to quickly and accurately determine the micro-ring resonant wavelength, the present application proposes a micro-ring resonant wavelength locking method based on a combination of an equal division comparison method and a perturbation technique. The micro-ring wavelength locking process of the present application is divided into two major steps. The first step is coarse alignment. By setting the threshold of the optical signal difference and comparing the optical signal difference, the optimal heating power search range is gradually narrowed and quickly obtained; the second step is fine alignment. In the coarse alignment stage, the approximate range where the optimal heating power is located has been found. Within this local range, the perturbation technique is used to determine the adjustment direction of the micro-heater power. According to the determined adjustment direction, the heating power is increased or decreased, and the micro-ring resonant wavelength is gradually accurately locked at the target wavelength. Therefore, the present application can quickly and accurately lock the micro-ring resonant wavelength.

[0059] It should be noted that the execution subject of this embodiment can be a micro-ring resonant wavelength locking system, or a computing service device with data processing, network communication and program running functions, such as a tablet computer, a personal computer, a mobile phone, etc., or a micro-ring resonant wavelength locking device capable of realizing the above functions, etc., and this embodiment does not specifically limit this. The following takes the micro-ring resonant wavelength locking device (referred to as the locking device) as the execution subject as an example to illustrate this embodiment and the following embodiments.

[0060] Based on this, the present application embodiment provides a micro-ring resonance wavelength locking method, referring to Figure 1 , Figure 1 This is a schematic diagram of the first process of the first embodiment of the micro-ring resonance wavelength locking method of the present application.

[0061] In this embodiment, the micro-ring resonance wavelength locking method includes steps S10 to S40:

[0062] Step S10, obtaining an initial power search range corresponding to the micro-ring heater;

[0063] It is understandable that the microring may be a silicon-based microring device body, and the above-mentioned initial power search range may be a power range in which the microring heater corresponding to the target microring can work. Figure 2 Taking the micro-ring work as an example, Figure 2 This is a schematic diagram of the micro-ring working principle of the first embodiment of the micro-ring resonance wavelength locking method of the present application. Figure 2 As shown, a micro-ring generally has four ports, namely, an input port, a through port, an add port, and a drop port, and the transmission power spectrum of each port is different. Figure 2 The microring in the microring is composed of two straight waveguides and one ring waveguide. The specific working principle is that the tunable laser module generates an optical signal of a certain wavelength and transmits it into the straight waveguide through the input end of the microring. Part of the optical signal of the straight waveguide is coupled to the ring waveguide, and part of it is retained in the straight waveguide. After the light coupled to the ring waveguide propagates in a circle, part of the optical signal returns to the straight waveguide again, and is coupled with the optical signal remaining in the straight waveguide for transmission and output from the straight-through end.

[0064] In addition, as mentioned above, the optical signal at the through end of the microring reaches a minimum at the resonant wavelength, e.g. Figure 3 As shown, Figure 3 The transmission spectrum of the micro-ring through port of the first embodiment of the micro-ring resonant wavelength locking method of the present application is shown in FIG. 1. At the resonance peak of the micro-ring through port transmission spectrum, the output optical signal is minimum. At this time, the resonance wavelength is aligned with the wavelength of the light source signal, but the micro-ring resonant wavelength is obviously inconsistent with the wavelength of the laser light signal, that is, the target wavelength. Therefore, the present embodiment needs to find the optimal working power corresponding to the micro-ring heater in the initial power search range. The optimal working power can lock the micro-ring resonant wavelength to the target wavelength output by the tunable laser module.

[0065] Step S20, performing a preset arithmetic difference comparison on the initial power search range based on a preset power difference value to obtain an optimized heating power;

[0066] It should be understood that, compared with the existing method of gradually comparing and locking the micro-ring resonant wavelength, the technical solution adopted in this embodiment is mainly composed of two major search stages: coarse search and fine alignment. Among them, when in the coarse search stage, the locking device needs to be responsible for finding the approximate range of the optimal heating power of the micro-ring heater to achieve rapid search; while in the fine alignment stage, the locking device can be responsible for judgment and fine-tuning, so that the microneedle resonant wavelength can be accurately locked at the target working wavelength to achieve precise locking.

[0067] Specifically, in the coarse search stage, the present embodiment can perform preset arithmetic comparisons on the initial power search range based on a pre-set power difference value, gradually narrow the power range of the micro-heat heater, and determine the heating power with the smallest corresponding optical power value near the optimal heating power, that is, the above-mentioned optimized heating power, and then perform precise alignment based on the optimized heating power.

[0068] It is understandable that in addition to the method of locking the resonant wavelength by monitoring the optical power mentioned in this embodiment, the resonant wavelength can also be locked by monitoring optical signals such as photocurrent and photovoltage. For example, at the implementation level, the optical signal at the direct end of the microring is generally converted into photoelectricity by a photodetector, and then amplified by a transimpedance amplifier to form a photovoltage signal, and the subsequent wavelength locking is achieved based on the monitored photovoltage signal. Therefore, this solution is not limited to a certain representation of the optical signal, and can be photocurrent or photovoltage, etc.

[0069] In one possible implementation, refer to Figure 4 , Figure 4 This is a second flow chart of the first embodiment of the micro-ring resonance wavelength locking method of the present application. In this embodiment, step S20 may include steps A1 to A4:

[0070] Step A1, determining an initial arithmetic progression according to an initial search upper limit and an initial search lower limit corresponding to the initial power search range;

[0071] It should be noted that, taking the acquisition of the micro-ring through-end signal as an example, the principle of performing a rough search based on the preset power difference and the initial power search range in this embodiment is to divide the initial power range into a certain number of arithmetic intervals, and then compare the optical power values ​​corresponding to the heating power at the boundaries of each equally divided interval, and continuously narrow the power search range based on the heating power at the minimum optical power value determined in each comparison result, until the boundary heating power difference corresponding to the narrowed power search range is less than the preset power difference, the rough search can be stopped, and the heating power with the smallest optical power value in the power search range finally determined is used as the optimized heating power. Therefore, this embodiment can use the binary method, the trisection method or other methods of dividing the search area to perform a preset arithmetic comparison on the initial power search range, thereby speeding up the search process.

[0072] Specifically, the preset arithmetic comparison process of this embodiment is illustrated by taking the three-part method as an example. In this embodiment, the locking device can first determine the initial search upper limit Pmax and the initial search lower limit Pmin corresponding to the initial power search range, and use the upper limit and the lower limit as the starting value and ending value of a 4-dimensional array, such as PO0=Pmin, PO3=Pmax. Further, the locking device can generate a set of arithmetic progressions PO=[PO0, PO1, PO2, PO3] according to the starting value and ending value of the four-dimensional array, where PO is the above-mentioned initial arithmetic progression.

[0073] Step A2, heating the target microring based on the initial arithmetic progression, and obtaining an initial optical signal array corresponding to the output of the target microring port;

[0074] It can be understood that in this embodiment, the control value of the microring heater can be set in sequence according to the order of the elements of the initial arithmetic sequence PO to heat the target microring, and the corresponding optical signal value of the target microring port (straight-through end or transparent end) can be read and recorded as PI=[PI0, PI1, PI2, PI3], where PI is the above-mentioned initial optical signal array.

[0075] Step A3, determining an optimized search range according to the initial optical signal array, and judging whether a boundary power difference corresponding to the optimized search range is less than a preset power difference;

[0076] It is easy to understand that in this embodiment, the initial optical signal array can be numerically compared, and a new search range, i.e., the above-mentioned optimized search range, can be determined based on the comparison result. Figure 5 , Figure 5 This is a third flow chart of the first embodiment of the micro-ring resonance wavelength locking method of the present application. In this embodiment, step A3 may include steps A31 to A33:

[0077] Step A31, traversing the initial optical signal array to determine the minimum optical signal in the initial optical signal array;

[0078] Step A32, determining the heating power value corresponding to the minimum light signal as the reference heating power;

[0079] Step A33, determining an optimized search range based on the reference heating power.

[0080] It is easy to understand that in this embodiment, each optical signal value in the initial optical signal value, namely, PI0, PI1, PI2 and PI3, needs to be compared item by item to obtain the minimum value, and the heating power value corresponding to the minimum value is determined as the reference heating power. Figure 3 It can be seen from the transmission spectrum characteristics shown that, in fact, this embodiment can only compare the two middle optical signal values, and determine the minimum optical signal based on the comparison result of the middle optical signal value. Furthermore, this embodiment can construct a new optimized search range with a narrowed search range based on the minimum optical signal as the middle value benchmark.

[0081] For ease of understanding, Figure 6 Take this as an example to illustrate: Figure 6 This is a schematic diagram of the rough search process of the first embodiment of the micro-ring resonance wavelength locking method of the present application. Figure 6As shown, in this embodiment, numerical comparison can be performed on PI1 and PI2, and the minimum optical signal can be determined based on the comparison result. If PI1 > PI2, then PI2 corresponds to the reference heating power. At this time, taking PI2 as the reference, the lower limit can be reset to PO0 = PO1, and then a new optimized search range can be formed according to the updated PO0, such as Figure 6 the process from (a) to (b) in; while if PI1 < PI2, then PI1 corresponds to the reference heating power. At this time, taking PI1 as the reference, the upper limit can be reset to PO3 = PO2, and then a new optimized search range can be formed according to the updated PO3, such as Figure 6 the process from (b) to (c) in.

[0082] Step A4, if so, then use the optimal heating power corresponding to the optimized search range as the optimized heating power.

[0083] It can be understood that after determining the optimized search range, if the boundary power difference corresponding to the optimized search range at this time is already less than the preset power difference, for example, ||PO3 - PO0|| < POs, where POs is the preset power difference, then the optimal heating power corresponding to the optimized search range can be directly used as the optimized heating power; if the boundary power difference corresponding to the optimized search range at this time is not less than the preset power difference, then this embodiment still needs to further narrow the power search range.

[0084] In a feasible implementation manner, in this embodiment, step S20 may further include steps A5 to A7:

[0085] Step A5, if not, then determine a reconstructed arithmetic progression according to the optimized search range;

[0086] Step A6, obtain the reconstructed optical signal array corresponding to the reconstructed arithmetic progression to determine the reconstructed search range;

[0087] Step A7, return to the step of judging whether the boundary power difference corresponding to the optimized search range is less than the preset power difference, and update the optimized search range based on the reconstructed search range until it is detected that the boundary power difference corresponding to the optimized search range is less than the preset power difference.

[0088] It is easy to understand that, as Figure 6 shown, if Figure 6In the result shown in (b), PO3-PO0 is not less than POs. In this embodiment, a new arithmetic array can be constructed based on PO3 and PO0 after the reset corresponding to the optimized search range, that is, the arithmetic progression can be reconstructed, and then the reconstructed arithmetic progression can be calculated and it can be determined whether the upper and lower limit difference of the new search array ||PO3-PO0|| is lower than the preset power difference. If the boundary power difference is still greater than the preset power difference, the power range is further narrowed; if it is lower than the preset power difference, the heating power corresponding to the minimum optical signal in the optimized search range can be used as the optimized heating power for the next step of fine alignment.

[0089] Step S30, determining a target error signal according to a preset perturbation signal and the optimized heating power;

[0090] Step S40: determining a locking direction of the resonant wavelength corresponding to the target microring based on the target error signal.

[0091] It is easy to understand that when the heating power with the smallest optical power value corresponding to the optimized search range is used as the optimized heating power, the fine alignment stage can be triggered. In the fine alignment stage, this embodiment can further perform dynamic and precise locking based on the preset perturbation signal and the optimized heating power. Therefore, compared with the existing method, this embodiment does not need to perform step-by-step locking, but performs fine alignment after a rapid coarse search, and the resonant wavelength locking speed is faster and more accurate.

[0092] In summary, compared with the existing micro-ring resonance wavelength locking method of step-by-step comparison, this embodiment proposes a micro-ring resonance wavelength locking method based on the combination of equal division comparison method and perturbation technology. The micro-ring wavelength locking process of this embodiment is divided into two major steps. The first step is coarse alignment. This embodiment gradually narrows and quickly determines the optimized heating power by setting the threshold of the optical signal difference and comparing the optical signal difference, that is, obtains the optimal heating power search range; the second step is fine alignment. In the coarse alignment stage, the approximate range where the optimal heating power is located has been found. In this local range, the perturbation technology and the target error signal are used to determine the adjustment direction of the micro-heater power. Then, on the basis of optimizing the heating power, the heating power is increased or decreased according to the determined adjustment direction, and the micro-ring resonance wavelength is gradually accurately locked at the target wavelength. Therefore, this embodiment can quickly and accurately lock the micro-ring resonance wavelength.

[0093] The present embodiment provides a method for locking a microring resonant wavelength, the method comprising: obtaining an initial power search range corresponding to a microring heater; performing a preset arithmetic comparison on the initial power search range based on a preset power difference to obtain an optimized heating power; determining a target error signal based on a preset perturbation signal and the optimized heating power; and determining a locking direction of a resonant wavelength corresponding to a target microring based on the target error signal. Compared with the existing microring resonant wavelength locking method based on step-by-step comparison, the present embodiment proposes a microring resonant wavelength locking method based on a combination of an equal division comparison method and a perturbation technique. The microring wavelength locking process of the present embodiment is divided into two major steps. The first step is coarse alignment. The present embodiment gradually narrows down and quickly determines the optimized heating power by setting a threshold of the optical signal difference and comparing the optical signal difference, that is, obtaining the optimal heating power search range; the second step is fine alignment. In the coarse alignment stage, the approximate range where the optimal heating power is located has been found. In this local range, the microheater power adjustment direction is determined using the perturbation technique and the target error signal. Then, on the basis of the optimized heating power, the heating power is increased or decreased according to the determined adjustment direction, and the microring resonant wavelength is gradually accurately locked at the target wavelength. Therefore, the present embodiment can quickly and accurately lock the microring resonant wavelength.

[0094] Based on the first embodiment of the present application, in the second embodiment of the present application, the same or similar contents as those in the above-mentioned embodiment 1 can be referred to the above introduction and will not be repeated later.

[0095] It is easy to understand that the existing micro-ring resonant wavelength has another defect, that is, it cannot be dynamically locked to the target wavelength in real time. Because once there is thermal disturbance inside and outside the system causing the micro-ring resonant wavelength to shift, the scanning process needs to be re-executed to obtain the optimal heating power under the current conditions.

[0096] In addition, combined Figure 3 It can be seen that if the wavelength of the laser light wave signal is to the right of the resonance wavelength, the output light signal increases, and the transmission spectrum is approximately a convex function. Therefore, no matter whether the wavelength of the light wave signal is to the left or right of the resonance wavelength, the output light signal at the through end will increase. In other words, there may be two microheater control quantities corresponding to one light signal measurement value. This feature brings certain challenges to the dynamic locking of the microring wavelength.

[0097] Therefore, based on the first embodiment, Figure 7 , Figure 7 This is a flow chart of the second embodiment of the micro-ring resonance wavelength locking method of the present application. In this embodiment, step S30 may include steps B1 to B2:

[0098] Step B1, generating a perturbation driving signal according to a preset perturbation signal and the optimized heating power;

[0099] Step B2, determining a target error signal based on the real-time optical signal output by the target microring port and the perturbation driving signal.

[0100] It is understandable that the present embodiment can generate a periodic perturbation signal, i.e., the above-mentioned preset perturbation signal, and superimpose it on the optimized heating power found in the coarse search stage to generate a new perturbation modulation drive signal, i.e., the above-mentioned perturbation drive signal. Among them, the preset perturbation signal includes but is not limited to various periodic signals such as sine, cosine or square wave. The following takes the superposition of a sinusoidal perturbation signal at the micro-ring through end as an example to specifically illustrate the precise alignment working principle of the present embodiment.

[0101] It is easy to understand that first, the perturbation modulation signal is superimposed on the constant heating power roughly searched, that is, the new heating mode generated after optimizing the heating power, that is, the perturbation driving signal can be expressed as:

[0102] PO dither (t) = PO[ind min ]+Asin(ωt); (1)

[0103] Among them, PO dither (t) is the perturbation driving signal, PO[ind min ] is to optimize the heating power, A is the amplitude of the sinusoidal signal, ω is the angular frequency, and t is the time.

[0104] In a feasible implementation manner, in this embodiment, step B2 may further include steps B21 to B22:

[0105] Step B21, determining a periodic power signal based on the real-time optical signal output by the target microring port and the perturbation driving signal;

[0106] Step B22, performing high frequency filtering on the periodic power signal to obtain a target error signal.

[0107] At this time, the locking device can monitor the real-time optical signal of the target microring port, that is, the through end, multiply it with the perturbation signal and then pass it through a low-pass filter, thereby filtering out the high-frequency signal and obtaining the target error signal.

[0108] Specifically, due to the application of a perturbation driving signal on the microheater, the measured optical signal value is also accompanied by a periodic performance. It is assumed that this periodic characteristic is expressed as:

[0109]

[0110] Where C is the thermal-optical response amplitude, ω is the angular frequency, Therefore, at this time, the optical signal measured after the target microring is modulated by the perturbation driving signal is multiplied by the perturbation thermal modulation signal itself, and the expression of the periodic power signal can be obtained as follows:

[0111]

[0112] It can be seen that the periodic power signal obtained after multiplication can be filtered out after low-pass filtering, leaving only a Related constants This is the target error signal mentioned above.

[0113] In a feasible implementation manner, in this embodiment, step S40 may include steps C1 to C3:

[0114] Step C1, obtaining the current signal polarity corresponding to the target error signal;

[0115] Step C2, obtaining the target port type corresponding to the target microring port;

[0116] Step C3, determining a locking direction of the resonant wavelength corresponding to the target microring according to the current signal polarity and the target port type.

[0117] It is important to understand that referring to Figure 8 , Figure 8 This is the transmission spectrum of the micro-ring through end under different heating power conditions of the second embodiment of the micro-ring resonance wavelength locking method of the present application. Figure 8 The different color curves correspond to the transmission spectra of different heating powers, where the horizontal axis is the wavelength (nm) and the vertical axis is the output light signal value (db). Figure 8 The heating powers corresponding to different colors on the right side are arranged in ascending order from top to bottom. Figure 8 It can be seen that as the heating power increases, the transmission spectrum moves to the right (in terms of red shift), and the resonant wavelength increases accordingly; as the heating power decreases, the transmission spectrum moves to the left (in terms of blue shift), and the resonant wavelength decreases accordingly. Therefore, this embodiment can determine whether the current microring resonant wavelength is to the left or right of the target wavelength based on the positive and negative polarity of the error signal, and then determine whether the next microheater power control direction should be increased or decreased.

[0118] In addition, it should be understood that for the target microring, the transmission characteristics of its straight-through end and the transmission end are exactly opposite, that is, the transmission end outputs the maximum optical signal at the resonant wavelength. Because the transmission spectrum characteristics of different ports are different, monitoring the optical signals of different ports will directly affect the judgment of the direction of the resonant wavelength shift, and thus affect the specific implementation of the wavelength locking method. Therefore, this embodiment also needs to determine whether the target port type of the current output optical signal port is a straight-through end or a transmission end, and finally determine the locking direction of the resonant wavelength corresponding to the final target microring based on the current signal polarity and the current port type.

[0119] Specifically, taking the through end as an example, assuming that the error constant obtained after high-frequency filtering is If the resonant wavelength is to the left of the target operating wavelength, the phase difference between the perturbation drive signal and the through-end optical signal response is The error constant should be positive; if the resonant wavelength is to the right of the target operating wavelength, the two are in phase The error constant should be a negative value. Therefore, by judging the positive or negative sign of the error constant, it is possible to determine whether the resonant wavelength is on the left or right side of the target wavelength, and then obtain the control direction of the microheater at the next moment. If the monitoring port is a through-port, the judgment of the resonant wavelength offset direction is opposite to that of the through-port. In addition, the judgment of the specific resonant wavelength offset direction may also be related to the type of perturbation drive signal and the setting of the initial phase (in this embodiment, the initial phase may be zero), but all of them belong to the application protection scope of the present technical method.

[0120] In summary, this embodiment can adjust the microring resonance wavelength in real time and dynamically to keep it aligned with the target operating wavelength, thereby effectively improving the microring resonance wavelength locking speed.

[0121] In this embodiment, a perturbation drive signal is generated according to a preset perturbation signal and an optimized heating power; a target error signal is determined based on a real-time optical signal output by a target microring port and a perturbation drive signal. A periodic power signal is determined based on a real-time optical signal output by a target microring port and a perturbation drive signal; a target error signal is obtained by high-frequency filtering the periodic power signal. The current signal polarity corresponding to the target error signal is obtained; the target port type corresponding to the target microring port is obtained; and the locking direction of the resonant wavelength corresponding to the target microring is determined according to the current signal polarity and the target port type. This embodiment can dynamically adjust the resonant wavelength of the microring in real time to keep it aligned with the target operating wavelength, thereby effectively improving the locking speed of the resonant wavelength of the microring.

[0122] It should be noted that the above examples are only used to understand the present application and do not constitute a limitation on the micro-ring resonance wavelength locking method of the present application. More simple transformations based on this technical concept are all within the protection scope of the present application.

[0123] This application also provides a micro-ring resonant wavelength locking device, please refer to Fig. 9 , Fig. 9 This is a schematic diagram of the module structure of the micro-ring resonant wavelength locking device in an embodiment of the present application. In this embodiment, the micro-ring resonant wavelength locking device includes:

[0124] A range determination module 901 is used to obtain an initial power search range corresponding to the micro-ring heater;

[0125] A coarse search module 902, configured to perform a preset arithmetic comparison on the initial power search range based on a preset power difference value to obtain an optimized heating power;

[0126] An error determination module 903, configured to determine a target error signal according to a preset perturbation signal and the optimized heating power;

[0127] The wavelength locking module 904 is used to determine the locking direction of the resonant wavelength corresponding to the target microring based on the target error signal.

[0128] As an implementable method, in this embodiment, the error determination module 903 is further used to generate a perturbation drive signal according to a preset perturbation signal and the optimized heating power;

[0129] The error determination module 903 is further configured to determine a target error signal based on the real-time optical signal output by the target micro-ring port and the perturbation driving signal.

[0130] As an implementable method, in this embodiment, the coarse search module 902 is further used to determine an initial arithmetic progression according to an initial search upper limit and an initial search lower limit corresponding to the initial power search range;

[0131] The coarse search module 902 is further used to heat the target microring based on the initial arithmetic progression and obtain an initial optical signal array corresponding to the output of the target microring port;

[0132] The coarse search module 902 is further used to determine an optimized search range according to the initial optical signal array, and determine whether a boundary power difference corresponding to the optimized search range is less than a preset power difference;

[0133] The coarse search module 902 is further configured to: if yes, use the best heating power corresponding to the optimization search range as the optimized heating power.

[0134] As an implementable method, in this embodiment, the coarse search module 902 is further used to traverse the initial optical signal array to determine the minimum optical signal in the initial optical signal array;

[0135] The coarse search module 902 is further configured to determine the heating power value corresponding to the minimum light signal as a reference heating power;

[0136] The coarse search module 902 is further configured to determine an optimized search range based on the reference heating power.

[0137] As an implementable method, in this embodiment, the rough search module 902 is further used to determine the reconstruction of the arithmetic progression according to the optimized search range if no;

[0138] The coarse search module 902 is further used to obtain a reconstructed optical signal array corresponding to the reconstructed arithmetic progression to determine a reconstruction search range;

[0139] The coarse search module 902 is also used to return to the step of determining whether the boundary power difference corresponding to the optimized search range is less than the preset power difference, and update the optimized search range based on the reconstructed search range until it is detected that the boundary power difference corresponding to the optimized search range is less than the preset power difference.

[0140] As an implementable method, in this embodiment, the error determination module 903 is further used to determine the periodic power signal based on the real-time optical signal output by the target micro-ring port and the perturbation driving signal;

[0141] The error determination module 903 is further configured to perform high frequency filtering on the periodic power signal to obtain a target error signal.

[0142] As an implementable method, in this embodiment, the wavelength locking module 904 is further used to obtain the current signal polarity corresponding to the target error signal;

[0143] The wavelength locking module 904 is further used to obtain the target port type corresponding to the target micro-ring port;

[0144] The wavelength locking module 904 is further configured to determine a locking direction of the resonant wavelength corresponding to the target microring according to the current signal polarity and the target port type.

[0145] The micro-ring resonant wavelength locking device provided by the present application adopts the micro-ring resonant wavelength locking method in the above-mentioned embodiment, which can solve the technical problem of micro-ring resonant wavelength locking. Compared with the prior art, the beneficial effects of the micro-ring resonant wavelength locking device provided by the present application are the same as the beneficial effects of the micro-ring resonant wavelength locking method provided by the above-mentioned embodiment, and other technical features in the micro-ring resonant wavelength locking device are the same as the features disclosed in the above-mentioned embodiment method, which will not be repeated here.

[0146] The present application provides a micro-ring resonance wavelength locking device, which includes: at least one processor; and a memory connected to the at least one processor in communication; wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor, so that the at least one processor can execute the micro-ring resonance wavelength locking method in the above-mentioned embodiment 1.

[0147] Reference below Fig.10, which shows a schematic diagram of the structure of a micro-ring resonant wavelength locking device suitable for implementing the embodiment of the present application. The micro-ring resonant wavelength locking device in the embodiment of the present application may include but is not limited to mobile terminals such as mobile phones, laptop computers, digital broadcast receivers, PDAs (Personal Digital Assistants), PADs (Portable Application Descriptions), PMPs (Portable Media Players), vehicle-mounted terminals (such as vehicle-mounted navigation terminals), etc., and fixed terminals such as digital TVs, desktop computers, etc. Fig.10 The micro-ring resonant wavelength locking device shown is only an example and should not bring any limitation to the functions and scope of use of the embodiments of the present application.

[0148] like Fig.10 As shown, the micro-ring resonant wavelength locking device may include a processing device 1001 (e.g., a central processing unit, a graphics processor, etc.), which can perform various appropriate actions and processes according to a program stored in a read-only memory (ROM: Read Only Memory) 1002 or a program loaded from a storage device 1003 to a random access memory (RAM: Random Access Memory) 1004. In RAM1004, various programs and data required for the operation of the micro-ring resonant wavelength locking device are also stored. The processing device 1001, ROM1002, and RAM1004 are connected to each other through a bus 1005. An input / output (I / O) interface 1006 is also connected to the bus. Generally, the following systems can be connected to the I / O interface 1006: an input device 1007 including, for example, a touch screen, a touch pad, a keyboard, a mouse, an image sensor, a microphone, an accelerometer, a gyroscope, etc.; an output device 1008 including, for example, a liquid crystal display (LCD: Liquid Crystal Display), a speaker, a vibrator, etc.; a storage device 1003 including, for example, a magnetic tape, a hard disk, etc.; and a communication device 1009. The communication device 1009 can allow the micro-ring resonant wavelength locking device to communicate with other devices wirelessly or by wire to exchange data. Although the micro-ring resonant wavelength locking device with various systems is shown in the figure, it should be understood that it is not required to implement or have all the systems shown. More or fewer systems can be implemented or have alternatively.

[0149] In particular, according to the embodiments disclosed in the present application, the process described above with reference to the flowchart can be implemented as a computer software program. For example, the embodiments disclosed in the present application include a micro-ring resonant wavelength locking program product, which includes a micro-ring resonant wavelength locking program carried on a computer-readable medium, and the micro-ring resonant wavelength locking program contains program code for executing the method shown in the flowchart. In such an embodiment, the micro-ring resonant wavelength locking program can be downloaded and installed from the network through a communication device, or installed from the storage device 1003, or installed from the ROM 1002. When the micro-ring resonant wavelength locking program is executed by the processing device 1001, the above functions defined in the method of the embodiment disclosed in the present application are executed.

[0150] The micro-ring resonant wavelength locking device provided by the present application adopts the micro-ring resonant wavelength locking method in the above-mentioned embodiment, which can solve the technical problem of micro-ring resonant wavelength locking. Compared with the prior art, the beneficial effects of the micro-ring resonant wavelength locking device provided by the present application are the same as the beneficial effects of the micro-ring resonant wavelength locking method provided by the above-mentioned embodiment, and the other technical features in the micro-ring resonant wavelength locking device are the same as the features disclosed in the method of the previous embodiment, which will not be repeated here.

[0151] It should be understood that the various parts disclosed in this application can be implemented by hardware, software, firmware or a combination thereof. In the description of the above embodiments, specific features, structures, materials or characteristics can be combined in any one or more embodiments or examples in a suitable manner.

[0152] The above are only specific implementations of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

[0153] The present application provides a storage medium having computer-readable program instructions (ie, a micro-ring resonance wavelength locking program) stored thereon, and the computer-readable program instructions are used to execute the micro-ring resonance wavelength locking method in the above-mentioned embodiment.

[0154] The storage medium provided in the present application may be, for example, a USB flash drive, but is not limited to electrical, magnetic, optical, electromagnetic, infrared, or semiconductor systems, systems or devices, or any combination of the above. More specific examples of storage media may include, but are not limited to: an electrical connection with one or more wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above. In this embodiment, the storage medium may be any tangible medium containing or storing a program that can be used by or in combination with an instruction execution system, system or device. The program code contained on the storage medium may be transmitted using any appropriate medium, including but not limited to: wires, optical cables, RF (Radio Frequency), etc., or any suitable combination of the above.

[0155] The storage medium may be included in the micro-ring resonance wavelength locking device; or may exist independently without being assembled into the micro-ring resonance wavelength locking device.

[0156] The storage medium carries one or more programs. When the one or more programs are executed by the micro-ring resonance wavelength locking device, the micro-ring resonance wavelength locking device: the micro-ring resonance wavelength is locked.

[0157] The micro-ring resonant wavelength locking program code for performing the operation of the present application can be written in one or more programming languages ​​or a combination thereof, including object-oriented programming languages ​​such as Java, Smalltalk, C++, and conventional procedural programming languages ​​such as "C" language or similar programming languages. The program code can be executed entirely on the user's computer, partially on the user's computer, as a separate software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In the case of a remote computer, the remote computer can be connected to the user's computer through any type of network, including a local area network (LAN) or a wide area network (WAN), or can be connected to an external computer (for example, through the Internet using an Internet service provider).

[0158] The flowcharts and block diagrams in the accompanying drawings illustrate the possible architecture, functions and operations of the systems, methods and micro-ring resonant wavelength locking program products according to various embodiments of the present application. In this regard, each box in the flowchart or block diagram may represent a module, a program segment, or a portion of a code, which contains one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative implementations, the functions marked in the boxes may also occur in an order different from that marked in the accompanying drawings. For example, two boxes represented in succession can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each box in the block diagram and / or flowchart, and the combination of boxes in the block diagram and / or flowchart, can be implemented with a dedicated hardware-based system that performs a specified function or operation, or can be implemented with a combination of dedicated hardware and computer instructions.

[0159] The modules involved in the embodiments described in this application may be implemented by software or hardware, wherein the name of the module does not constitute a limitation on the unit itself in some cases.

[0160] The readable storage medium provided by the present application is a storage medium, which stores computer-readable program instructions (i.e., micro-ring resonant wavelength locking program) for executing the above-mentioned micro-ring resonant wavelength locking method, and can solve the technical problem of micro-ring resonant wavelength locking. Compared with the prior art, the beneficial effects of the storage medium provided by the present application are the same as the beneficial effects of the micro-ring resonant wavelength locking method provided by the above-mentioned embodiment, and will not be repeated here.

[0161] The above are only some embodiments of the present application, and are not intended to limit the patent scope of the present application. All equivalent structural changes made using the contents of the present application specification and drawings under the technical concept of the present application, or direct / indirect application in other related technical fields are included in the patent protection scope of the present application.

Claims

1. A micro-ring resonance wavelength locking method, characterized in that: The method comprises: Obtain an initial power search range corresponding to the micro-ring heater; Performing a preset arithmetic comparison on the initial power search range based on a preset power difference to obtain an optimized heating power; Determining a target error signal according to a preset perturbation signal and the optimized heating power; The locking direction of the resonant wavelength corresponding to the target microring is determined based on the target error signal.

2. The micro-ring resonance wavelength locking method according to claim 1, characterized in that: The step of determining the target error signal according to the preset perturbation signal and the optimized heating power comprises: generating a perturbation driving signal according to a preset perturbation signal and the optimized heating power; A target error signal is determined based on the real-time optical signal output by the target microring port and the perturbation driving signal.

3. The micro-ring resonance wavelength locking method according to claim 2, characterized in that: The step of performing a preset arithmetic comparison on the initial power search range based on the preset power difference to obtain the optimized heating power comprises: Determine an initial arithmetic progression according to an initial search upper limit and an initial search lower limit corresponding to the initial power search range; Heating the target microring based on the initial arithmetic progression, and obtaining an initial optical signal array outputted corresponding to a port of the target microring; Determining an optimized search range according to the initial optical signal array, and judging whether a boundary power difference value corresponding to the optimized search range is less than a preset power difference value; If so, the optimal heating power corresponding to the optimization search range is used as the optimized heating power.

4. The micro-ring resonance wavelength locking method according to claim 3, characterized in that: The step of determining the optimized search range according to the initial optical signal array comprises: Traversing the initial optical signal array to determine a minimum optical signal in the initial optical signal array; Determining the heating power value corresponding to the minimum light signal as the reference heating power; An optimization search range is determined based on the reference heating power.

5. The micro-ring resonance wavelength locking method according to claim 4, characterized in that: After determining whether the boundary power difference value corresponding to the optimization search range is less than the preset power difference value, the method further includes: If not, reconstructing the arithmetic progression is determined according to the optimized search range; Obtaining a reconstructed optical signal array corresponding to the reconstructed arithmetic progression to determine a reconstruction search range; Return to the step of determining whether the boundary power difference value corresponding to the optimized search range is less than the preset power difference value, and update the optimized search range based on the reconstructed search range until it is detected that the boundary power difference value corresponding to the optimized search range is less than the preset power difference value.

6. The micro-ring resonance wavelength locking method according to claim 2, characterized in that: The step of determining the target error signal based on the real-time optical signal output by the target microring port and the perturbation drive signal comprises: Determine a periodic power signal based on a real-time optical signal output by a target microring port and the perturbation driving signal; The periodic power signal is subjected to high frequency filtering to obtain a target error signal.

7. The micro-ring resonance wavelength locking method according to claim 2, characterized in that: The step of determining the locking direction of the resonant wavelength corresponding to the target microring based on the target error signal comprises: Obtaining a current signal polarity corresponding to the target error signal; Obtaining a target port type corresponding to the target microring port; The locking direction of the resonant wavelength corresponding to the target microring is determined according to the current signal polarity and the target port type.

8. A micro-ring resonant wavelength locking device, characterized in that: The micro-ring resonant wavelength locking device comprises: A range determination module, used to obtain an initial power search range corresponding to the micro-ring heater; A coarse search module, used for performing a preset arithmetic comparison on the initial power search range based on a preset power difference value to obtain an optimized heating power; An error determination module, used to determine a target error signal according to a preset perturbation signal and the optimized heating power; The wavelength locking module is used to determine the locking direction of the resonant wavelength corresponding to the target microring based on the target error signal.

9. A micro-ring resonant wavelength locking device, characterized in that: The microring resonance wavelength locking device comprises: a memory, a processor, and a microring resonance wavelength locking program stored in the memory and executable on the processor, wherein the microring resonance wavelength locking program is configured to implement the steps of the microring resonance wavelength locking method according to any one of claims 1 to 7.

10. A storage medium, characterized in that: The storage medium is a storage medium on which a micro-ring resonance wavelength locking program is stored. When the micro-ring resonance wavelength locking program is executed by a processor, the steps of the micro-ring resonance wavelength locking method according to any one of claims 1 to 7 are implemented.

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