Resonant wavelength locking method and device, equipment, storage medium and computer program product

Abstract

The invention discloses a resonant wavelength locking method, device and equipment, a storage medium and a computer program product, and the method comprises the steps: respectively converting optical signals of an input end and a straight-through end of a micro-ring into electric signals, and obtaining a first electric signal and a second electric signal; filtering the first electric signal and the second electric signal to obtain an input electric signal and an output electric signal; normalizing the input electric signal and the output electric signal to obtain a normalized electric signal; and determining a corresponding electric signal intensity gradient value according to the normalized electric signal, and adjusting a next-step control decision of the micro-heater based on the electric signal intensity gradient value and a previous-step control decision of the micro-heater of the micro-ring. Compared with the prior art, light intensity changes generated by other ports of the micro-ring are eliminated through normalized electric signal processing, the next control decision of the micro-heater is adjusted based on the electric signal intensity gradient value and the previous control decision of the micro-heater, and tracking and locking of the resonant wavelength of the micro-ring are achieved.

Description

Technical Field

[0001] The present invention relates to the field of optical communication technology, and in particular to a resonance wavelength locking method, device, equipment, storage medium and computer program product. Background Art

[0002] Since silicon-based microring resonator (microring) devices are easily affected by external or system thermal disturbances in actual applications, causing the resonant wavelength to shift, this high thermal sensitivity makes the working state of microring-based devices unstable, which greatly limits the large-scale industrial application of such devices.

[0003] In order to solve the wavelength drift problem of silicon-based microring devices, corresponding wavelength locking schemes are required in practical applications. Common locking methods can be roughly divided into open-loop locking and closed-loop locking. The open-loop locking scheme is to reduce the thermal sensitivity of microring devices by introducing special materials or designing specific structures. This method is not suitable for large-scale integration due to the new materials introduced. It is a passive solution to stabilize the resonant wavelength. The closed-loop solution is more common than the open-loop solution, and there are more related research applications. The basic principle of the closed-loop locking scheme is to change the thermo-optical effect or electro-optical effect of the microring by monitoring system parameters such as output optical power, bit error rate or temperature, and adjusting the micro-heating module or bias voltage in real time to change the thermo-optical effect or electro-optical effect of the microring, so as to achieve the purpose of changing the resonant wavelength. However, the closed-loop locking scheme has poor signal processing flexibility and is not conducive to on-chip integration, which leads to poor locking effect of the microring resonant wavelength.

[0004] Therefore, there is an urgent need for a resonant wavelength locking method that can effectively solve the technical problem that the resonant wavelength of microring-based devices is shifted due to thermal disturbances in practical applications, and improve the locking effect of the resonant wavelength. Summary of the invention

[0005] The main purpose of the present invention is to provide a resonant wavelength locking method, device, equipment, storage medium and computer program product, aiming to solve the technical problem in the prior art that the resonant wavelength of micro-ring-based devices is shifted due to thermal disturbance in practical applications.

[0006] To achieve the above object, the present invention provides a resonance wavelength locking method, the method comprising the following steps:

[0007] Converting optical signals at the input end and the through end of the micro-ring into electrical signals respectively to obtain a first electrical signal and a second electrical signal;

[0008] Filtering the first electrical signal and the second electrical signal to obtain an input electrical signal and an output electrical signal;

[0009] Normalizing the input electrical signal and the output electrical signal to obtain a normalized electrical signal;

[0010] The corresponding electric signal intensity gradient value is determined according to the normalized electric signal, and the next control decision of the microheater is adjusted based on the electric signal intensity gradient value and the previous control decision of the microheater of the microring.

[0011] Optionally, the step of determining the corresponding electrical signal intensity gradient value according to the normalized electrical signal comprises:

[0012] Determining an electrical signal value within a preset sliding window based on the normalized electrical signal, and storing the electrical signal value within the preset sliding window in a register, wherein the register updates and stores the latest electrical signal value within the preset sliding window in real time;

[0013] The electrical signal strength gradient is estimated for the electrical signal value within the preset sliding window according to the first preset relationship to obtain the electrical signal strength gradient value.

[0014] Optionally, the first preset relationship is:

[0015]

[0016] In the formula, represents the electrical signal intensity gradient value, N represents the number of electrical signal values, V i represents the value of the ith electrical signal, X i represents the i-th serial number in the array storing the electrical signal value in the register, V represents the array storing the electrical signal value, X represents the serial number of the array storing the electrical signal value, and X=[1,2,...N].

[0017] Optionally, the step of adjusting the next control decision of the microheater based on the electrical signal intensity gradient value and the previous control decision of the microheater of the microring comprises:

[0018] Determining whether the gradient sign is positive based on the second preset relationship and the electrical signal intensity gradient value;

[0019] If the sign of the gradient is positive, determining the previous control decision of the microheater of the microring;

[0020] The next control decision of the microheater is adjusted according to the previous control decision of the microheater.

[0021] Optionally, the step of adjusting the next control decision of the microheater according to the previous control decision of the microheater includes:

[0022] If the previous control decision of the microheater is to increase the DC bias of the microheater, then the next control decision of the microheater is adjusted to reduce the DC bias of the microheater;

[0023] If the previous control decision of the microheater is to reduce the DC bias of the microheater, the next control decision of the microheater is adjusted to increase the DC bias of the microheater.

[0024] Optionally, the step of converting the optical signals at the input end and the through end of the microring into electrical signals respectively to obtain the first electrical signal and the second electrical signal comprises:

[0025] The optical signals at the input end and the through end of the micro-ring are converted into a first current signal and a second current signal respectively by using a photodetector;

[0026] The first current signal and the second current signal are respectively converted and amplified into photovoltage signals by using a transimpedance amplifier to obtain a first electrical signal and a second electrical signal.

[0027] In addition, to achieve the above object, the present invention also provides a resonant wavelength locking device, the device comprising:

[0028] The photoelectric conversion module is used to convert the optical signals at the input end and the through end of the micro-ring into electrical signals respectively, so as to obtain a first electrical signal and a second electrical signal;

[0029] A low-pass filtering module, used for filtering the first electrical signal and the second electrical signal to obtain an input electrical signal and an output electrical signal;

[0030] A first control module, used for normalizing the input electrical signal and the output electrical signal to obtain a normalized electrical signal;

[0031] The second control module is used to determine the corresponding electric signal intensity gradient value according to the normalized electric signal, and adjust the next control decision of the microheater based on the electric signal intensity gradient value and the previous control decision of the microheater of the microring.

[0032] In addition, to achieve the above-mentioned purpose, the present invention also proposes a resonant wavelength locking device, which includes: a memory, a processor, and a resonant wavelength locking program stored in the memory and executable on the processor, wherein the resonant wavelength locking program is configured to implement the steps of the resonant wavelength locking method described above.

[0033] In addition, to achieve the above objective, the present invention further proposes a storage medium, on which a resonance wavelength locking program is stored, and when the resonance wavelength locking program is executed by a processor, the steps of the resonance wavelength locking method described above are implemented.

[0034] In addition, to achieve the above-mentioned purpose, the present application also provides a computer program product, wherein the computer program product includes a computer program, and when the computer program is executed by a processor, the steps of the resonance wavelength locking method as described above are implemented.

[0035] The present invention discloses converting optical signals at the input end and the through end of a microring into electrical signals respectively to obtain a first electrical signal and a second electrical signal; filtering the first electrical signal and the second electrical signal to obtain an input electrical signal and an output electrical signal; normalizing the input electrical signal and the output electrical signal to obtain a normalized electrical signal; determining a corresponding electrical signal intensity gradient value according to the normalized electrical signal, and adjusting the next control decision of the microheater based on the electrical signal intensity gradient value and the previous control decision of the microheater of the microring. Compared with the prior art, the present invention eliminates the light intensity change caused by the input optical power change at the through end or other ports by using normalized electrical signal processing, and jointly adjusts the next control decision of the microheater according to the electrical signal intensity gradient value and the previous control decision of the microheater, thereby realizing the tracking and locking of the resonant wavelength of the microring, thereby improving the locking effect of the resonant wavelength. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a schematic diagram of the flow chart of the first embodiment of the resonant wavelength locking method of the present invention;

[0037] Figure 2 It is a schematic diagram of the basic working principle of the micro-ring in the resonant wavelength locking method of the present invention;

[0038] Figure 3 The transmission spectra of the straight-through end and the transmitted end of the microring;

[0039] Figure 4 It is a schematic diagram of the flow chart of the second embodiment of the resonant wavelength locking method of the present invention;

[0040] Figure 5 It is a schematic diagram of the flow chart of the third embodiment of the resonant wavelength locking method of the present invention;

[0041] Figure 6 is a structural block diagram of a first embodiment of a resonant wavelength locking device according to the present invention;

[0042] Figure 7 It is a schematic diagram of the implementation process of the resonant wavelength locking device of the present invention;

[0043] Figure 8 It is a schematic structural diagram of the resonant wavelength locking device of the present invention;

[0044] Fig. 9 A schematic diagram of the implementation logic of the first control module and the second control module in the resonant wavelength locking device of the present invention;

[0045] Fig.10 It is a schematic diagram of the structure of a resonant wavelength locking device in a hardware operating environment involved in an embodiment of the present invention.

[0046] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0047] It should be understood that the specific embodiments described herein are only used to explain the present invention, and are not used to limit the present invention.

[0048] The embodiment of the present invention provides a resonance wavelength locking method, referring to Figure 1 , Figure 1 FIG. 4 is a flow chart of a first embodiment of a resonance wavelength locking method according to the present invention.

[0049] In this embodiment, the resonance wavelength locking method includes the following steps:

[0050] Step S10: converting the optical signals at the input end and the through end of the micro-ring into electrical signals respectively to obtain a first electrical signal and a second electrical signal.

[0051] It should be noted that the execution subject of this embodiment can be a computer server device with data processing, network communication and program running functions used in the scenario of tracking and locking a certain unknown wavelength optical signal, such as a server, a tablet computer, a smart phone, a smart watch, etc., or an electronic device capable of realizing the above functions, a resonant wavelength locking device, etc. The following takes the resonant wavelength locking device as an example to illustrate this embodiment and the following embodiments.

[0052] It should be understood that the microring can be a silicon-based microring resonator. In optical communication systems, the microring is considered to be a key component for achieving low-cost, low-power large-scale on-chip optoelectronic integration due to its small size, good integration advantages, and low power consumption. Microring devices usually need to work on a certain wavelength of optical signal, but due to many factors such as process deviation and temperature, their working stability is poor. Therefore, it is usually necessary to use the thermo-optical or electro-optical properties of the microring to dynamically adjust the working state of the microring.

[0053] For example, refer to Figure 2 , Figure 2The schematic diagram of the basic working principle of the micro-ring in the resonant wavelength locking method of the present invention is shown in FIG. The micro-ring generally has four ports, namely: Input Port, Throughput Port, Add Port and Drop Port. The transmission power spectrum of each port is different. For example, the transmission optical power of the through-port reaches the minimum at the resonant wavelength, while the output optical power of the through-port reaches the maximum at the resonant wavelength. Therefore, monitoring the optical power of different ports of the micro-ring will directly affect the judgment of the resonant wavelength offset direction. Figure 2 The micro-ring is composed of two straight waveguides and one annular waveguide. The micro-heating module (i.e., micro-heater) on the annular waveguide can be a resistor in nature. The specific working principle of the micro-ring is that the tunable laser generates a light signal of a certain wavelength and transmits it into the straight waveguide through the input port of the micro-ring. Part of the light signal of the straight waveguide is coupled to the annular waveguide, and part of it is retained in the straight waveguide. After the light coupled to the annular waveguide propagates through a circle, part of the light signal returns to the straight waveguide again, and is coupled with the light signal remaining in the straight waveguide and output from the through-port. Part of the light signal coupled into the micro-ring rotates continuously in the annular waveguide and resonates, and is coupled with another straight waveguide, so that part of the signal light is coupled into the straight waveguide and output from the drop port.

[0054] It should be explained that since the power fluctuation of the input optical signal will directly affect the size of the output optical power at the through-end, in order to eliminate the changes in the output optical intensity that may be caused by the changes in the input optical signal intensity, two optical signal (input end and through-end) monitoring is introduced to convert the optical signals at the input end and the through-end of the micro-ring into electrical signals respectively.

[0055] In a specific implementation, a photodetector can be used to convert the optical signals at the input end and the through end of the microring into a first current signal and a second current signal respectively; a transimpedance amplifier can be used to convert the first current signal and the second current signal into photovoltage signals respectively to obtain a first electrical signal and a second electrical signal.

[0056] Step S20: filtering the first electrical signal and the second electrical signal to obtain an input electrical signal and an output electrical signal.

[0057] It should be understood that in order to improve the quality of the electrical signal, the first electrical signal and the second electrical signal may be filtered to filter out high-frequency noise in the first electrical signal and the second electrical signal to obtain an input electrical signal and an output electrical signal.

[0058] Step S30: normalizing the input electrical signal and the output electrical signal to obtain a normalized electrical signal.

[0059] It should be noted that the above normalization process may be to convert the input electrical signal and the output electrical signal into a normalized electrical signal through a normalization operation subcircuit, thereby eliminating the influence of the input electrical signal intensity change on the output optical signal.

[0060] For example, the input electrical signal and the output electrical signal are recorded as V in and V thr , then the normalized electrical signal can be expressed as V = V thr / V in .

[0061] Step S40: determining a corresponding electric signal intensity gradient value according to the normalized electric signal, and adjusting a next control decision of the microheater based on the electric signal intensity gradient value and a previous control decision of the microheater of the microring.

[0062] It should be understood that, since the first electrical signal and the second electrical signal can be photovoltage signals, the normalized electrical signal can also be a photovoltage signal, so the electrical signal intensity gradient value can be a value used to reflect the reverse increase or decrease of the photovoltage intensity.

[0063] In a specific implementation, the electric signal intensity gradient may be estimated based on the normalized electric signal to obtain a corresponding electric signal intensity gradient value; then, it is determined whether the electric signal intensity gradient value satisfies a preset condition; if the electric signal intensity gradient value satisfies the preset condition, the next control decision of the microheater is adjusted based on the previous control decision of the microheater of the microring.

[0064] It should be understood that this embodiment can effectively utilize the thermo-optical effect of the microring to change its working resonant wavelength, so that the resonant wavelength of the microring is equal to the wavelength of the target optical signal.

[0065] It should be explained that the wavelength alignment, or equal wavelengths, or consistent wavelengths in the present application case refers to the small difference between the microring resonant wavelength and the target working wavelength. If the deviation between the two is kept within a certain small range, it is considered to be wavelength alignment, or equal wavelengths, or consistent wavelengths.

[0066] It is understandable that the above-mentioned previous control decision and next control decision may refer to control strategies for the power, current or voltage of the micro-heater, which is not limited in this embodiment.

[0067] It should be understood that the above-mentioned preset condition may be a custom setting, for example, the preset condition may be that the electrical signal intensity gradient value is greater than a certain value.

[0068] Figure 3The transmission spectra of the through-end and through-end of the microring are shown in Figure 1. The FSR (Free Spectral Range) is an important parameter. FSR is defined as the wavelength span or frequency interval between two adjacent resonance peaks. For microring resonators, FSR is closely related to parameters such as the radius, refractive index, and coupling coefficient of the microring. Figure 3 It can be seen that when the micro-ring resonates, the output power of the Throughput Port reaches the minimum, and the Drop Port reaches the maximum at this time. Therefore, if the ambient temperature changes, the resonant wavelength of the micro-ring shifts, which will cause the optical power of the Throughput Port and the Drop Port to change in opposite directions. It can be seen that monitoring different ports will directly affect the specific judgment conditions set in the scheme, but fundamentally, no matter which port or multiple ports are monitored, the method idea is no different from the application example in this embodiment.

[0069] This embodiment discloses converting the optical signals at the input end and the through end of the microring into electrical signals respectively to obtain a first electrical signal and a second electrical signal; filtering the first electrical signal and the second electrical signal to obtain an input electrical signal and an output electrical signal; normalizing the input electrical signal and the output electrical signal to obtain a normalized electrical signal; determining the corresponding electrical signal intensity gradient value according to the normalized electrical signal, and adjusting the next control decision of the microheater based on the electrical signal intensity gradient value and the previous control decision of the microheater of the microring. Compared with the prior art, since this embodiment uses normalized electrical signal processing to eliminate the light intensity change caused by the input optical power change at the through end or other ports, and jointly adjusts the next control decision of the microheater according to the electrical signal intensity gradient value and the previous control decision of the microheater, the tracking and locking of the resonant wavelength of the microring is achieved, thereby improving the locking effect of the resonant wavelength.

[0070] refer to Figure 4 , Figure 4 FIG. 4 is a flow chart of a second embodiment of a resonance wavelength locking method according to the present invention.

[0071] Based on the above first embodiment, in this embodiment, step S40 includes:

[0072] Step S401: Determine the electrical signal value within a preset sliding window based on the normalized electrical signal, and store the electrical signal value within the preset sliding window into a register, which updates and stores the latest electrical signal value within the preset sliding window in real time.

[0073] Step S402: Estimating the electrical signal strength gradient of the electrical signal value within the preset sliding window according to the first preset relationship to obtain the electrical signal strength gradient value.

[0074] In a specific implementation, the normalized electrical signal is updated in real time by a register to store the latest electrical signal value with a data length of N, and then the gradient of the array with a length of N stored in the register is calculated in real time based on the first preset relationship, that is, the electrical signal intensity gradient value is calculated.

[0075] It should be noted that the register stores an array of length N, which updates the latest sensed photoelectric signal data in real time, which is equivalent to setting a sliding window with a data length of N on the data history time axis. By calculating and analyzing the data in the sliding window, the real-time or quasi-real-time gradient of the signal can be obtained. The electrical signal intensity gradient value is calculated in real time according to the first preset relationship.

[0076] Assume that at the current time k, the register stores the latest N electrical signal values ​​detected, which is recorded as the sliding window V at the current time = [V k-(N-1) ,V k-(N-2) ,…,V k ] T ,Assuming that the serial number of the array is recorded as X=[1,2,...N], the electric signal intensity gradient value can be calculated using a linear regression method. Therefore, the first preset relationship can be:

[0077]

[0078] In the formula, represents the electrical signal intensity gradient value, N represents the number of electrical signal values, V i represents the value of the ith electrical signal, X i represents the i-th serial number in the array storing the electrical signal value in the register, V represents the array storing the electrical signal value, X represents the serial number of the array storing the electrical signal value, and X=[1,2,...N].

[0079] It should be understood that the above-mentioned electrical signal intensity gradient value can be calculated using a linear regression method or other methods, and the specific implementation is not limited to various methods such as electronic hardware or software.

[0080] This embodiment discloses converting the optical signals at the input end and the through end of the microring into electrical signals respectively to obtain a first electrical signal and a second electrical signal; filtering the first electrical signal and the second electrical signal to obtain an input electrical signal and an output electrical signal; normalizing the input electrical signal and the output electrical signal to obtain a normalized electrical signal; determining the electrical signal value within a preset sliding window based on the normalized electrical signal, and storing the electrical signal value within the preset sliding window to a register, the register updating and storing the latest electrical signal value within the preset sliding window in real time; estimating the electrical signal intensity gradient of the electrical signal value within the preset sliding window according to a first preset relationship to obtain an electrical signal intensity gradient value; adjusting the next control decision of the microheater based on the electrical signal intensity gradient value and the previous control decision of the microheater of the microring. Compared with the prior art, this embodiment monitors the photoelectric signal in real time based on the sliding window, estimates the electrical signal intensity gradient of the electrical signal value within the sliding window according to the first preset relationship, and then jointly adjusts the next control decision of the microheater according to the electrical signal intensity gradient value and the previous control decision of the microheater, further improving the flexibility of signal processing and the microring wavelength locking effect.

[0081] refer to Figure 5 , Figure 5 FIG. 4 is a flow chart of a third embodiment of a resonance wavelength locking method according to the present invention.

[0082] Based on the above embodiments, in this embodiment, step S40 further includes:

[0083] Step S403: determining whether the gradient sign is positive based on the second preset relationship and the electrical signal strength gradient value.

[0084] Step S404: If the sign of the gradient is positive, then determining the previous control decision of the microheater of the microring.

[0085] Step S405: adjusting the next control decision of the microheater according to the previous control decision of the microheater.

[0086] It should be noted that the above second preset relationship can be expressed as:

[0087] The electrical signal intensity gradient value is ≥ the preset threshold;

[0088] If the electrical signal intensity gradient value is greater than or equal to the preset threshold, it indicates that the gradient sign is positive, otherwise, it indicates that the gradient sign is negative.

[0089] It should be explained that the preset threshold in the second preset relationship can be selected as 0 or a smaller value. The smaller the preset threshold, the looser the judgment condition and the greater the possibility of misjudgment; the larger the preset threshold, the stricter the judgment condition and the more accurate the judgment result.

[0090] It should be noted that step S405 includes: if the previous control decision of the microheater is to increase the DC bias of the microheater (i.e., increase the power of the microheater), then the next control decision of the microheater is adjusted to reduce the DC bias of the microheater; if the previous control decision of the microheater is to reduce the DC bias of the microheater, then the next control decision of the microheater is adjusted to increase the DC bias of the microheater.

[0091] This embodiment discloses converting the optical signals at the input end and the through end of the microring into electrical signals respectively to obtain a first electrical signal and a second electrical signal; filtering the first electrical signal and the second electrical signal to obtain an input electrical signal and an output electrical signal; normalizing the input electrical signal and the output electrical signal to obtain a normalized electrical signal; determining the corresponding electrical signal intensity gradient value according to the normalized electrical signal; judging whether the gradient sign is positive based on a second preset relationship and the electrical signal intensity gradient value; if the gradient sign is positive, determining the previous control decision of the microheater of the microring; adjusting the next control decision of the microheater according to the previous control decision of the microheater. Compared with the prior art, since this embodiment illustrates the specific implementation content of jointly adjusting the next control decision of the microheater according to the electrical signal intensity gradient value and the previous control decision of the microheater, the tracking and locking of the resonant wavelength of the microring is realized.

[0092] In addition, an embodiment of the present invention further provides a storage medium, on which a resonance wavelength locking program is stored, and when the resonance wavelength locking program is executed by a processor, the steps of the resonance wavelength locking method described above are implemented.

[0093] Reference Figure 6 , Figure 6 FIG. 4 is a structural block diagram of a first embodiment of a resonant wavelength locking device according to the present invention.

[0094] like Figure 6 As shown, the resonance wavelength locking device provided in the embodiment of the present invention includes: a photoelectric conversion module 501 , a low-pass filtering module 502 , a first control module 503 and a second control module 504 .

[0095] The photoelectric conversion module 501 is used to convert the optical signals at the input end and the through end of the micro-ring into electrical signals respectively, to obtain a first electrical signal and a second electrical signal.

[0096] The low-pass filtering module 502 is used to filter the first electrical signal and the second electrical signal to obtain an input electrical signal and an output electrical signal.

[0097] The first control module 503 is used to perform normalization processing on the input electrical signal and the output electrical signal to obtain a normalized electrical signal.

[0098] The second control module 504 is used to determine the corresponding electric signal intensity gradient value according to the normalized electric signal, and adjust the next control decision of the microheater based on the electric signal intensity gradient value and the previous control decision of the microheater of the microring.

[0099] The photoelectric conversion module 501 is also used to use a photodetector to convert the optical signals at the input end and the through end of the microring into a first current signal and a second current signal respectively; use a transimpedance amplifier to convert and amplify the first current signal and the second current signal into photovoltage signals respectively, to obtain a first electrical signal and a second electrical signal.

[0100] refer to Figure 7 , Figure 7 The figure is a schematic diagram of the implementation process of the resonant wavelength locking device of the present invention. The two optical signals at the input port and the through-port of the micro-ring are monitored and processed, and the heating module of the micro-ring is the micro-heater of the micro-ring. The resonant wavelength locking device in the figure includes a photoelectric conversion module, a low-pass filter module and a control module (i.e., a first control module and a second control module). In order to increase the power of the signal, the device can also include a power amplification module (i.e., a power amplifier in the figure).

[0101] refer to Figure 8 , Figure 8 The laser is used to generate an optical signal of a certain wavelength, and this embodiment monitors and processes two optical signals at the input port and the through-port. Figure 3 In the example, the photoelectric conversion module is composed of a photodetector (PD) and a transimpedance amplifier (TIA), which are used to detect optical signals and convert them into corresponding electrical signals; the filtering module is used to filter noise signals in the electrical signals. The original optical signal is monitored, amplified and filtered to obtain an electrical signal, which is then transmitted to the first control module (i.e., the gradient monitoring submodule) in the control module to estimate the electrical signal intensity gradient; the next control decision of the microheater is adjusted by the first control module (i.e., the control strategy submodule) in the control module. Finally, in order to increase the power of the signal, the device can also include a power amplifier module (i.e., the power amplifier in the figure).

[0102] refer to Fig. 9 , Fig. 9The present invention is a schematic diagram of the implementation logic of the first control module (gradient monitoring submodule in the control module) and the second control module (control strategy submodule in the control module) in the resonant wavelength locking device. In the figure, the input electrical signal and the output electrical signal are input into the gradient monitoring submodule in the control module. First, the two electrical signals are converted into a normalized electrical signal through the normalization operation subcircuit, eliminating the influence of the input electrical signal intensity change on the output optical signal. The normalized electrical signal is updated in real time by the register to store the latest data length N electrical signal value. The judgment circuit calculates the gradient of the array of length N stored in the register in real time based on the first preset relationship, and then judges whether the gradient sign is positive based on the second preset relationship. If the gradient sign of the normalized electrical signal intensity is positive, the next step of the control strategy submodule is entered. The control decision submodule is responsible for jointly deciding the control amount at the next moment based on the real-time light intensity gradient sign and the control amount at the previous moment. Specifically, if the control decision at the last moment is to increase the DC bias of the microheater (i.e., increase the power of the microheater), and the electrical signal gradient is positive, the control strategy will be adjusted to reduce the DC bias of the microheater; if the control strategy at the last step is to reduce the DC bias of the microheater, and the electrical signal gradient is positive, the control strategy will be adjusted to increase the DC bias of the microheater. The control module illustrated in this embodiment can effectively utilize the thermo-optical effect of the microring to change its working resonant wavelength, so that the resonant wavelength of the microring is equal to the wavelength of the target optical signal. The integrated heater microring device in the figure is a photonic integrated device that combines a microring resonator with a heater.

[0103] The embodiment of the device discloses converting the optical signals at the input end and the through end of the microring into electrical signals respectively to obtain a first electrical signal and a second electrical signal; filtering the first electrical signal and the second electrical signal to obtain an input electrical signal and an output electrical signal; normalizing the input electrical signal and the output electrical signal to obtain a normalized electrical signal; determining the corresponding electrical signal intensity gradient value according to the normalized electrical signal, and adjusting the next control decision of the microheater based on the electrical signal intensity gradient value and the previous control decision of the microheater of the microring. Compared with the prior art, since the embodiment of the device uses normalized electrical signal processing to eliminate the light intensity change caused by the input optical power change at the through end or other ports, the next control decision of the microheater is adjusted according to the electrical signal intensity gradient value and the previous control decision of the microheater, so as to realize the tracking and locking of the resonant wavelength of the microring, thereby improving the locking effect of the resonant wavelength.

[0104] Based on the above-mentioned first embodiment of the resonant wavelength locking device of the present invention, a second embodiment of the resonant wavelength locking device of the present invention is proposed.

[0105] In this embodiment, the first control module 503 is also used to determine the electrical signal value within a preset sliding window based on the normalized electrical signal, and store the electrical signal value within the preset sliding window in a register, which updates and stores the latest electrical signal value within the preset sliding window in real time; and estimates the electrical signal strength gradient of the electrical signal value within the preset sliding window according to the first preset relationship to obtain the electrical signal strength gradient value.

[0106] Other embodiments or specific implementations of the resonant wavelength locking device of the present invention may refer to the above-mentioned method embodiments, which will not be described in detail here.

[0107] The present application provides a resonant 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 resonant wavelength locking method in the above-mentioned embodiment 1.

[0108] Reference below Fig.10 , which shows a schematic diagram of the structure of a resonant wavelength locking device suitable for implementing the embodiment of the present application. The 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 resonance 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.

[0109] like Fig.10As shown, the 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) 1002 or a program loaded from a storage device 1003 to a random access memory (RAM) 1004. In the RAM 1004, various programs and data required for the operation of the resonant wavelength locking device are also stored. The processing device 1001, the ROM 1002, and the RAM 1004 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), 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 resonant wavelength locking device to communicate with other devices wirelessly or by wire to exchange data. Although the figure shows a resonant wavelength locking device with various systems, 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.

[0110] 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 computer program product, which includes a computer program carried on a computer-readable medium, and the computer program includes a program code for executing the method shown in the flowchart. In such an embodiment, the computer program can be downloaded and installed from a network through a communication device, or installed from a storage device 1003, or installed from a ROM 1002. When the computer program is executed by the processing device 1001, the above-mentioned functions defined in the method of the embodiment disclosed in the present application are executed.

[0111] The resonant wavelength locking device provided by the present application adopts the resonant wavelength locking method in the above embodiment, which can solve the technical problem that the resonant wavelength of the micro-ring-based device in the prior art is shifted due to thermal disturbance in practical applications. Compared with the prior art, the beneficial effects of the resonant wavelength locking device provided by the present application are the same as the beneficial effects of the resonant wavelength locking method provided by the above embodiment, and the other technical features in the resonant wavelength locking device are the same as the features disclosed in the method of the previous embodiment, which will not be repeated here.

[0112] 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.

[0113] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present 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.

[0114] The flow chart and block diagram in the accompanying drawings illustrate the possible architecture, function and operation of the system, method and computer program product according to various embodiments of the present application. In this regard, each square box in the flow chart or block diagram can represent a module, a program segment or a part of a code, and the module, the program segment or a part of the code contains one or more executable instructions for realizing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the square box can also occur in a sequence different from that marked in the accompanying drawings. For example, two square 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 square box in the block diagram and / or flow chart, and the combination of the square boxes in the block diagram and / or flow chart 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.

[0115] 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.

[0116] The present application also provides a computer program product, including a computer program, wherein when the computer program is executed by a processor, the steps of the resonance wavelength locking method as described above are implemented.

[0117] The computer program product provided by the present application can solve the technical problem in the prior art that the resonant wavelength of a micro-ring-based device is shifted by thermal disturbance in practical applications. Compared with the prior art, the beneficial effects of the computer program product provided by the present application are the same as the beneficial effects of the resonant wavelength locking method provided by the above embodiment, and will not be described in detail here.

[0118] It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or system including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or system. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or system including the element.

[0119] The serial numbers of the above embodiments of the present invention are only for description and do not represent the advantages or disadvantages of the embodiments.

[0120] Through the description of the above implementation methods, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus a necessary general hardware platform, and of course can also be implemented by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present invention, or the part that contributes to the prior art, can be embodied in the form of a software product, which is stored in a storage medium (such as a read-only memory / random access memory, a magnetic disk, or an optical disk), and includes a number of instructions for a terminal device (which can be a mobile phone, a computer, a server, an air conditioner, or a network device, etc.) to execute the methods described in each embodiment of the present invention.

[0121] The above are only preferred embodiments of the present invention, and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A resonance wavelength locking method, characterized in that: The method comprises: Converting optical signals at the input end and the through end of the micro-ring into electrical signals respectively to obtain a first electrical signal and a second electrical signal; Filtering the first electrical signal and the second electrical signal to obtain an input electrical signal and an output electrical signal; Normalizing the input electrical signal and the output electrical signal to obtain a normalized electrical signal; The corresponding electric signal intensity gradient value is determined according to the normalized electric signal, and the next control decision of the microheater is adjusted based on the electric signal intensity gradient value and the previous control decision of the microheater of the microring.

2. The resonance wavelength locking method according to claim 1, characterized in that: The step of determining the corresponding electrical signal intensity gradient value according to the normalized electrical signal comprises: Determining an electrical signal value within a preset sliding window based on the normalized electrical signal, and storing the electrical signal value within the preset sliding window in a register, wherein the register updates and stores the latest electrical signal value within the preset sliding window in real time; The electrical signal strength gradient is estimated for the electrical signal value within the preset sliding window according to the first preset relationship to obtain the electrical signal strength gradient value.

3. The resonance wavelength locking method according to claim 2, characterized in that: The first preset relationship is: In the formula, represents the electrical signal intensity gradient value, N represents the number of electrical signal values, V i represents the value of the ith electrical signal, X i represents the i-th serial number in the array storing the electrical signal value in the register, V represents the array storing the electrical signal value, X represents the serial number of the array storing the electrical signal value, and X=[1,2,...N].

4. The resonance wavelength locking method according to claim 1, characterized in that: The step of adjusting the next control decision of the microheater based on the electrical signal intensity gradient value and the previous control decision of the microheater of the microring comprises: Determining whether the gradient sign is positive based on the second preset relationship and the electrical signal intensity gradient value; If the sign of the gradient is positive, determining the previous control decision of the microheater of the microring; The next control decision of the microheater is adjusted according to the previous control decision of the microheater.

5. The resonance wavelength locking method according to claim 4, characterized in that: The step of adjusting the next control decision of the microheater according to the previous control decision of the microheater comprises: If the previous control decision of the microheater is to increase the DC bias of the microheater, then the next control decision of the microheater is adjusted to reduce the DC bias of the microheater; If the previous control decision of the microheater is to reduce the DC bias of the microheater, the next control decision of the microheater is adjusted to increase the DC bias of the microheater.

6. The resonant wavelength locking method according to any one of claims 1 to 5, characterized in that: The step of converting the optical signals at the input end and the through end of the micro-ring into electrical signals respectively to obtain the first electrical signal and the second electrical signal comprises: The optical signals at the input end and the through end of the micro-ring are converted into a first current signal and a second current signal respectively by using a photodetector; The first current signal and the second current signal are respectively converted and amplified into photovoltage signals by using a transimpedance amplifier to obtain a first electrical signal and a second electrical signal.

7. A resonant wavelength locking device, characterized in that: The device comprises: The photoelectric conversion module is used to convert the optical signals at the input end and the through end of the micro-ring into electrical signals respectively, so as to obtain a first electrical signal and a second electrical signal; A low-pass filtering module, used for filtering the first electrical signal and the second electrical signal to obtain an input electrical signal and an output electrical signal; A first control module, used for normalizing the input electrical signal and the output electrical signal to obtain a normalized electrical signal; The second control module is used to determine the corresponding electric signal intensity gradient value according to the normalized electric signal, and adjust the next control decision of the microheater based on the electric signal intensity gradient value and the previous control decision of the microheater of the microring.

8. A resonant wavelength locking device, characterized in that: The device comprises: a memory, a processor, and a resonance wavelength locking program stored in the memory and executable on the processor, wherein the resonance wavelength locking program is configured to implement the steps of the resonance wavelength locking method according to any one of claims 1 to 6.

9. A storage medium, characterized in that: The storage medium stores a resonance wavelength locking program, and when the resonance wavelength locking program is executed by the processor, the steps of the resonance wavelength locking method according to any one of claims 1 to 6 are implemented.

10. A computer program product, characterized in that The computer program product comprises a computer program, and when the computer program is executed by a processor, the steps of the resonance wavelength locking method according to any one of claims 1 to 6 are implemented.

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