Spectral reconstruction method, chip, device and medium of multi-source spectrometer chip

Abstract

The application discloses a spectrum reconstruction method, a chip, an equipment and a medium of a multi-light-source spectrometer, relates to the technical field of spectrum reconstruction, and comprises the following steps: a spectrometer module modulates at least one level in a multi-level Mach-Zehnder interferometer based on a control signal, so that the spectrometer module has a specific spectral response function in a current modulation state, and modulates an input light source signal; a disturbed light signal with corresponding disturbance is irradiated to a to-be-measured object; a photodetector detects reflected light signals generated after the disturbed light signal irradiates the to-be-measured object; a transmission response matrix of the spectrometer module is acquired, and a detection signal vector output by the photodetector is acquired; and the detection signal vector and the transmission response matrix are used to reconstruct an absorption spectrum of the to-be-measured object. The application has the advantages that the accuracy and the dynamic range of spectrum reconstruction can be improved.

Description

Technical Field

[0001] This invention relates to the field of spectral reconstruction technology, specifically to spectral reconstruction methods, chips, devices, and media for multi-source spectrometer chips. Background Technology

[0002] As spectrometers evolve towards miniaturization, portability, and on-chip integration, microchip-based light sources have become the mainstream choice for spectrometer chips due to their advantages such as small size and low power consumption. However, limited by the luminescent properties of materials and chip manufacturing processes, the emission bandwidth of these micro-light sources is typically only tens of nanometers to hundreds of nanometers, making it difficult to meet the requirements for continuous and wide-range wavelength coverage in broadband detection scenarios.

[0003] To address the issue of insufficient bandwidth in micro-light sources, the mainstream technology is to employ a multi-light source combining scheme. This involves using a specific combining device to combine the wavelengths of multiple micro-light sources in different bands to form a broadband light source that covers the detection range.

[0004] However, the original design intent of a wavelength multiplexer is to combine discrete wavelength channels, thus requiring a deliberate increase in light loss between adjacent wavelengths to ensure channel isolation. Furthermore, when a wavelength multiplexer combines the outputs of multiple micro-light sources from different wavelength bands, although adjusting the structural parameters of the multiplexer can partially alleviate the loss problem in the intermediate wavelengths, the inherent characteristic of the multiplexer—trading high loss for isolation—cannot be changed. This inevitably leads to attenuation of light energy in non-target wavelength bands, thus affecting the accuracy and dynamic range of spectral reconstruction. Summary of the Invention

[0005] This invention aims to address one of the technical problems in related technologies to a certain extent. To this end, this invention provides a spectral reconstruction method, chip, device, and medium for a multi-source spectrometer chip, which has the advantages of improving the accuracy and dynamic range of spectral reconstruction.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A spectral reconstruction method for a multi-source spectrometer chip, the multi-source spectrometer chip comprising a narrowband light source module, a spectrometer module, and a photodetector, the narrowband light source module comprising multiple narrowband light sources, the spectrometer module comprising a multi-stage Mach-Zehnder interferometer cascade structure, and the spectrometer module having multiple light input ports whose number matches the number of the multiple narrowband light sources; The method includes: A control signal is provided to the multi-source spectrometer chip to control multiple narrowband light sources to provide light source signals to multiple light input ports in a one-to-one correspondence. At the same time, the spectrometer module modulates at least one stage of the multi-stage Mach-Zehnder interferometer based on the control signal, so that the spectrometer module has a specific spectral response function in the current modulation state, and modulates the input light source signal, so that the perturbed light signal with corresponding perturbation illuminates the test object, and the photodetector detects the reflected light signal generated after the perturbed light signal illuminates the test object; Obtain the pre-calibrated transmission response matrix of the spectrometer module and the detection signal vector output by the photodetector; The absorption spectrum of the analyte is reconstructed using the detection signal vector and the transmission response matrix.

[0007] Optionally, the plurality of narrowband light sources have corresponding emission band ranges, and the combination of the emission band ranges corresponding to each narrowband light source constitutes the detection broadband of the light source spectrometer.

[0008] Optionally, the number of narrowband light sources is two, and the multi-stage Mach-Zehnder interferometer cascade structure of the spectrometer module includes a series-type Mach-Zehnder interferometer (MZI) one-dimensional array, which has two input ports and two output ports. The step of illuminating the test object with a disturbed optical signal having a corresponding disturbance includes: the series-connected MZI one-dimensional array processing the light source signal to obtain the disturbed optical signal, and the two light output ports of the series-connected MZI one-dimensional array illuminating the test object with the disturbed optical signal.

[0009] Optionally, the number of narrowband light sources is at least three; the multi-stage Mach-Zehnder interferometer cascade structure of the spectrometer module includes a converging Mach-Zehnder interferometer (MZI) array and a series-connected tandem MZI one-dimensional array, wherein the converging MZI array has the multiple input ports and two output ports. The step of illuminating the test object with a disturbed optical signal containing a corresponding disturbance includes: the converging MZI array processing the light source signal to obtain a converged optical signal; the two output ports transmitting the converged optical signal to the two input ports of the series-connected MZI one-dimensional array; the series-connected MZI one-dimensional array processing the converged optical signal to obtain a disturbed optical signal; and the two output ports of the series-connected MZI one-dimensional array illuminating the test object with the disturbed optical signal.

[0010] Optionally, the convergent MZI array includes multiple MZI unit groups connected in sequence. The input ports of the multiple MZIs in the first MZI unit group constitute multiple optical input ports of the convergent MZI array, and the last MZI unit group includes two MZIs and the output ports of the two MZIs constitute two optical output ports of the convergent MZI array. For any MZI unit group connected first, the number of MZIs in it is greater than the number of MZIs in the MZI unit group connected to it, and optical signals are transmitted from one of the output ports of each MZI to the MZI unit group connected to it.

[0011] Optionally, the absorption spectrum of the analyte can be reconstructed according to the following linear equation: ,in, This represents the transmission response matrix. This represents the probe signal vector. This indicates the absorption spectrum.

[0012] Optionally, the narrowband light source is coupled to the light input port via a lens or optical fiber.

[0013] Secondly, the present invention also provides a multi-source spectrometer chip, the multi-source spectrometer chip comprising a narrowband light source module, a spectrometer module and a photodetector, the narrowband light source module comprising multiple narrowband light sources, the spectrometer module comprising a multi-stage Mach-Zehnder interferometer cascade structure, and the spectrometer module having multiple light input ports in a number matching the number of the multiple narrowband light sources; Multiple narrowband light sources are used to provide light source signals to multiple light input ports in a one-to-one correspondence with control signals. The spectrometer module is used to modulate at least one stage of the multi-stage Mach-Zehnder interferometer in response to control signals, so that the spectrometer module has a specific spectral response function in the current modulation state, and modulates the input light source signal to illuminate the test object with a perturbed light signal. The photodetector is used to detect the reflected light signal generated after the perturbed light signal illuminates the test object in response to control signals to obtain a detection signal vector. The detection signal vector is used together with the pre-calibrated transmission response matrix of the spectrometer module to reconstruct the absorption spectrum of the analyte.

[0014] Thirdly, the present invention also provides a computer device, including a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to implement the spectral reconstruction method of the multi-source spectrometer chip described in any of the above claims.

[0015] Fourthly, the present invention also provides a computer-readable medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the spectral reconstruction method of the multi-source spectrometer chip described in any of the preceding claims.

[0016] In this invention, the spectral reconstruction method relies on the unique hardware architecture of the multi-source spectrometer chip. Through a one-to-one correspondence between multiple narrowband light sources and multiple input ports of the spectrometer module, and leveraging the cascaded interference characteristics of the multi-stage Mach-Zehnder interferometer (MZI) in the spectrometer module, it achieves natural superposition and perturbation control of multi-source signals without the need for additional multiplexing devices. Combined with a pre-calibrated transmission response matrix, this method not only effectively overcomes the bottleneck of limited bandwidth of a single micro narrowband light source, enabling flexible expansion of the wide-spectrum detection range, but also avoids the energy attenuation of non-target bands introduced by traditional multiplexing devices due to the deliberate protection of channel isolation. It maximizes the preservation of the original signal energy of the light source, improving the information integrity and accuracy of the detection signal vector. Simultaneously, this method is deeply integrated with the chip's design, eliminating the need for complex multiplexing control logic. While simplifying the overall system complexity and reducing hardware cost and size, the precise matching calculation between the transmission response matrix and the detection signal vector ensures high accuracy and a wide dynamic range in the reconstruction results of the analyte's absorption spectrum.

[0017] These features and advantages of the present invention will be disclosed in detail in the following specific embodiments and accompanying drawings. The preferred embodiments or means of the present invention will be shown in detail in conjunction with the accompanying drawings, but are not intended to limit the technical solutions of the present invention. In addition, each of these features, elements and components appearing in the following text and drawings is a plurality of, and different symbols or numbers are used for convenience of representation, but all represent parts with the same or similar construction or function. Attached Figure Description

[0018] The present invention will be further described below with reference to the accompanying drawings: Figure 1 A flowchart illustrating one embodiment of the spectral reconstruction method for the multi-source spectrometer chip provided by the present invention; Figure 2 This is a schematic diagram of the tandem Mach-Zehnder interferometer MZI one-dimensional array provided by the present invention; Figure 3 A schematic diagram of a converging Mach-Zehnder interferometer (MZI) array with four narrowband light sources and its connected tandem MZI one-dimensional array provided by the present invention. Figure 4 A schematic diagram of a converging Mach-Zehnder interferometer (MZI) array with eight narrowband light sources and its connected tandem MZI one-dimensional array provided by the present invention. Figure 5 This is a schematic diagram of the structure of the electronic device provided by the present invention.

[0019] Explanation of reference numerals in the attached figures: 101: Processor; 102: Memory; 103: I / O interface; 104: Bus; 11: MZI input port; 12: MZI output port. Detailed Implementation

[0020] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described are intended to explain the present invention and should not be construed as limiting the invention.

[0021] The terms "an embodiment," "example," or "trademark" used in this specification refer to a particular feature, structure, or characteristic described in connection with the embodiment itself that may be included in at least one embodiment disclosed in this invention. The phrase "in an embodiment" appearing in various places throughout the specification does not necessarily refer to the same embodiment.

[0022] As a first aspect of the present invention, a method for spectral reconstruction of a multi-source spectrometer chip is provided, such as... Figure 1 As shown, the method includes: In step S110, a control signal is provided to the multi-source spectrometer chip to control the multiple narrowband light sources to provide light source signals to the multiple light input ports in a one-to-one correspondence. At the same time, the spectrometer module modulates at least one stage of the multi-stage Mach-Zehnder interferometer based on the control signal, so that the spectrometer module has a specific spectral response function in the current modulation state, and modulates the input light source signal, so that the perturbed light signal with corresponding disturbance illuminates the test object, and the photodetector detects the reflected light signal generated after the perturbed light signal illuminates the test object.

[0023] In this embodiment, the multi-source spectrometer chip includes a narrowband light source module, a spectrometer module, and a photodetector. The narrowband light source module includes multiple narrowband light sources, and the spectrometer module includes a cascaded structure of multi-stage Mach-Zehnder interferometers. The spectrometer module has multiple input ports, the number of which matches the number of the multiple narrowband light sources. The multiple narrowband light sources have corresponding emission wavelength ranges, and the combination of the emission wavelength ranges corresponding to each narrowband light source constitutes the detection broadband of the light source spectrometer. For example, the narrowband light sources include narrowband light source 1, narrowband light source 2, narrowband light source 3, and narrowband light source 4. The emission wavelength range of narrowband light source 1 is 400nm-450nm, the emission wavelength range of narrowband light source 2 is 450nm-475nm, the emission wavelength range of narrowband light source 3 is 475nm-525nm, and the emission wavelength range of narrowband light source 4 is 525nm-600nm. The continuous connection of the wavelengths of narrowband light sources 1 to 4 constitutes a detection broadband of 400nm-600nm.

[0024] Specifically, each Mach-Zehnder interferometer (MZI) unit in the spectrometer module can integrate an independently controllable phase modulator, such as a thermo-optic modulator or an electro-optic modulator. By applying different control signals to change the optical path difference between the two arms of the MZI, it can be placed in different combined light states, i.e., different modulation states. During spectral measurement, instead of a single optical signal acquisition, a series of different control signals are output to the spectrometer chip. Under the action of each specific set of control signals, multiple narrowband light sources are simultaneously illuminated, providing light source signals to their corresponding input ports. The phase modulators of each stage of the MZI are set to a specific set of values, so that the entire cascaded network produces a specific and complex spectral filtering effect on the input multi-channel broadband combined light, i.e., the spectral response function. The reflected light signal from the test object corresponding to this modulation state is then acquired using a photodetector. Immediately afterwards, the system quickly switches to the next set of control signals, switching each MZI stage to a different modulation state, obtaining another spectral response function and the corresponding reflected light signal. This process is repeated M times to obtain M different measurement values.

[0025] It should be noted that the number of narrowband light sources in this embodiment is two or at least three. When the number of narrowband light sources is two, the multi-stage Mach-Zehnder interferometer cascade structure of the spectrometer module includes a tandem Mach-Zehnder interferometer (MZI) one-dimensional array, which has two input ports and two output ports. Alternatively, as another optional implementation, the tandem MZI one-dimensional array processes the light source signal to obtain a perturbed optical signal, and the two output ports of the tandem MZI one-dimensional array illuminate the object under test with the perturbed optical signal. Figure 2 As shown, Figure 2This is a schematic diagram of a tandem Mach-Zehnder interferometer (MZI) one-dimensional array.

[0026] Accordingly, when the number of narrowband light sources is at least three, the multi-stage Mach-Zehnder interferometer cascade structure of the spectrometer module includes a converging Mach-Zehnder interferometer (MZI) array and a connected series-connected one-dimensional MZI array. The converging MZI array has the multiple input ports and two output ports. The converging MZI array processes the light source signal to obtain a converged light signal. The two output ports transmit the converged light signal to the two input ports of the series-connected one-dimensional MZI array. The series-connected one-dimensional MZI array processes the converged light signal to obtain a perturbed light signal. The two output ports of the series-connected one-dimensional MZI array illuminate the object under test with the perturbed light signal. Meanwhile, as another optional implementation, the convergent MZI array includes multiple MZI unit groups connected sequentially. The input ports of multiple MZIs in the first MZI unit group constitute multiple input ports of the convergent MZI array. The last MZI unit group includes two MZIs, and the output ports of the two MZIs constitute two output ports of the convergent MZI array. For any MZI unit group connected first, the number of MZIs in it is greater than the number of MZIs in the subsequent MZI unit groups. Furthermore, optical signals are transmitted from one output port of each MZI to the subsequent MZI unit groups. Here, the MZIs are active asymmetric MZIs.

[0027] Specifically, for a series-connected MZI one-dimensional array, the explanation will focus on two narrowband light sources, referring to... Figure 2 As shown, a narrowband light source can be connected to two input ports of a cascaded MZI one-dimensional array via a lens or fiber optic coupling. Under the control of a control signal, it provides light source signals to the two input ports of the cascaded MZI one-dimensional array. For example, narrowband light source 1 provides a light source signal to the upper arm input port of the cascaded MZI one-dimensional array, and narrowband light source 2 provides a light source signal to the lower arm input port of the cascaded MZI one-dimensional array. After multiple MZIs are cascaded, for the input light source signal, the output light source signal after perturbation can be determined using the input photoelectric field intensity of the input light source signal and the response matrix of the cascaded MZI one-dimensional array. ,in, The photoelectric field intensity represents the light source signal of narrowband light source 1. The photoelectric field intensity represents the light source signal of narrowband light source 2. This represents the photoelectric field intensity of the perturbed optical signal output from the upper arm output port of a series-connected MZI one-dimensional array. The response matrix represents a cascaded MZI one-dimensional array, which can be the product of the response matrices of each MZI in cascaded order.

[0028] For example, taking a tandem MZI one-dimensional array consisting of two MZIs as an example, the response matrix of each MZI is a 2×2 matrix. The response matrix of each MZI can be calculated using wave optics methods such as coupled-mode theory and beam propagation, based on parameters such as the asymmetric arm length, waveguide refractive index, beam splitter combining ratio, and phase modulation unit characteristics of each MZI. The response matrix of the first MZI is denoted as... The response matrix of the second MZI is denoted as Subsequently, according to the cascading order of the preceding and succeeding stages, the product of the response matrices of each MZI is taken as the response matrix of the cascaded one-dimensional MZI array, i.e. , , , .

[0029] After obtaining the photoelectric field intensity of the disturbed optical signal, the conversion relationship between light intensity and electric field can be used, i.e., the light intensity is proportional to the square of the magnitude of the electric field, to... Convert to , The intensity spectrum of the light source signals of two narrowband light sources after being perturbed by a series-type MZI one-dimensional array is the light intensity form of the perturbed light signal. Its spectral width can cover the joint wavelength of the two light sources, providing a broadband light source for subsequent irradiation of the test object. This represents the intensity spectrum of the light source signals from two narrowband light sources, which can be a physical quantity directly calibrated by a light source spectrometer.

[0030] Accordingly, for the spectrometer module consisting of a convergent Mach-Zehnder interferometer (MZI) array and its connected tandem MZI one-dimensional array, the description will be based on four or eight narrowband light sources, referring to... Figure 3 and Figure 4 As shown, Figure 3 This is a schematic diagram of a converging Mach-Zehnder interferometer (MZI) array with four narrowband light sources and its connected tandem MZI one-dimensional array. Figure 4 This is a schematic diagram of a converging Mach-Zehnder interferometer (MZI) array with eight narrowband light sources and its connected tandem MZI one-dimensional array.

[0031] exist Figure 3In this convergent MZI array, there is a group of MZI units, each containing two MZIs. The input ports of the two MZIs constitute multiple input ports of the convergent MZI array, and any output port of each MZI constitutes one of the two output ports of the convergent MZI array. Specifically, the upper arm input port and lower arm input port of the first-stage MZI serve as the input ports of narrowband light source 1 and narrowband light source 2, respectively, and one of the upper arm output ports or lower arm output ports of the first-stage MZI serves as one output port of the convergent MZI array. Similarly, the upper arm input port and lower arm input port of the second-stage MZI serve as the input ports of narrowband light source 3 and narrowband light source 4, respectively, and one of the upper arm output ports or lower arm output ports of the second-stage MZI serves as the other output port of the convergent MZI array. Figure 3 In this design, the lower arm output port of the first-stage MZI and the upper arm output port of the second-stage MZI serve as the two output ports of the converging MZI array, which are then connected to the two input ports of the tandem MZI one-dimensional array. This allows the tandem MZI one-dimensional array to receive the converged optical signal output from the output ports of the converging MZI array through its two input ports. The tandem MZI one-dimensional array processes the converged optical signal using a similar procedure described above, obtaining a perturbed optical signal. This perturbed optical signal is then projected onto the object under test through the two output ports of the tandem MZI one-dimensional array.

[0032] exist Figure 4In the convergent MZI array, there are two groups of MZI units. The first MZI unit group includes four MZIs, and the second MZI unit group includes two MZIs. The input ports 11 of each MZI in the first MZI unit group constitute multiple input ports of the convergent MZI array. Any output port 12 of each MZI in the first MZI unit group is connected to the input port 11 of each MZI in the second MZI unit group. One output port 12 of each MZI in the second MZI unit group constitutes two output ports of the convergent MZI array. That is, the upper arm input port and lower arm input port of the first-stage MZI in the first MZI unit group serve as the light input ports of narrowband light source 1 and narrowband light source 2, respectively, and the lower arm output port of the first-stage MZI is connected to the upper arm input port of the first-stage MZI in the second MZI unit group; the upper arm input port and lower arm input port of the second-stage MZI in the first MZI unit group serve as the light input ports of narrowband light source 3 and narrowband light source 4, respectively, and the upper arm output port of the second-stage MZI is connected to the lower arm input port of the first-stage MZI in the second MZI unit group; the upper arm input port and lower arm input port of the third-stage MZI in the first MZI unit group serve as narrowband light source 5 and narrowband light source 6, respectively. The input port of the first MZI unit group is connected to the upper arm input port of the second MZI unit group. The upper arm input port and lower arm input port of the fourth MZI unit group are respectively used as the input ports of the narrowband light source 7 and the narrowband light source 8. The lower arm output port of the fourth MZI unit group is connected to the lower arm input port of the second MZI unit group. The lower arm output port of the first MZI unit group and the upper arm output port of the second MZI unit group are respectively used as the two output ports of the convergent MZI array. The two output ports of the convergent MZI array are respectively connected to the two input ports of the serial MZI one-dimensional array. Each MZI in the first MZI unit group can perturb the narrowband light source signal according to the aforementioned operation, and transmit the perturbed light signal to the second MZI unit group. Each MZI in the second MZI unit group performs secondary perturbation processing on the perturbed light signal transmitted from the first MZI unit group, and uses the light signal after secondary perturbation as a converged light signal, which is transmitted to the tandem MZI one-dimensional array through the output port and the input port of the tandem MZI one-dimensional array. The tandem MZI one-dimensional array perturbs the converged light signal transmitted from the converged MZI array to obtain a perturbed light signal, and illuminates the object under test through the two output ports of the tandem MZI one-dimensional array.

[0033] In the case where the number of narrowband light sources is greater than two and is odd, let's take three narrowband light sources as an example. Three narrowband light sources of different wavelengths can be connected to input ports 1, 2, and 3 of a converging MZI array, respectively, while input port 4 remains unconnected. When the three light source signals simultaneously enter the converging MZI array from input ports 1, 2, and 3, the array performs optical processing through interference and coupling, merging the three signals into two output signals. These two signals then enter a tandem MZI one-dimensional array for further perturbation modulation to obtain a perturbed optical signal, which is finally used to illuminate the object under test.

[0034] In this embodiment, for an application scenario with two narrowband light sources, the light source signals are directly received through the dual input ports of a series-connected MZI one-dimensional array. This not only enables the integration and perturbation processing of the two light source signals without the need for additional multiplexing devices, but also avoids any loss of light source energy. Compared to on-chip multiplexing devices such as MUX, which require deliberate design of adjacent wavelength loss structures to ensure channel isolation, resulting in energy attenuation in non-target wavelength bands, the two input ports of the series-connected MZI one-dimensional array in this embodiment are directly matched with the two narrowband light sources one by one. The light source signals directly enter the MZI array for processing, and virtual multiplexing can be achieved through the interference characteristics of MZI without the need for additional multiplexing devices, thereby avoiding the insertion loss caused by multiplexing devices and achieving zero additional loss of light source energy.

[0035] For scenarios with at least three narrowband light sources, a combined architecture of a converging MZI array and a tandem MZI one-dimensional array is used. The converging MZI array first achieves efficient convergence of signals from multiple light sources, and then transmits the signals to the tandem MZI one-dimensional array for perturbation processing. This enables flexible expansion of the wide spectral range, adapting to diverse detection needs from conventional spectral width to wide spectral coverage, and solving the problems of limited number of light sources and difficulty in spectral width expansion in traditional spectrometers.

[0036] Furthermore, compared to traditional MUX multiplexing, the combined architecture of the converging MZI array and the serial MZI one-dimensional array in this embodiment can reduce the energy loss of the light source. The core design goal of a MUX is to separate and combine discrete wavelength channels. To ensure low crosstalk between channels, an isolation structure needs to be designed, i.e., channel differentiation is achieved by increasing the energy loss of adjacent wavelengths. However, this operation leads to attenuation of energy in non-target wavelength bands, and the more narrowband light sources there are, the more significant the isolation loss becomes. To address this issue, the input port of the converging MZI array in this embodiment is matched one-to-one with the number of narrowband light sources. Each MZI stage only integrates the two input light source signals through interference superposition, without any isolation operation, thereby avoiding the additional losses caused by channel isolation in the MUX and thus reducing the energy loss of the light source.

[0037] Meanwhile, whether it is a single serial MZI one-dimensional array in a two-source scenario or a combination of a converging MZI array and a serial MZI one-dimensional array in a multi-source scenario, both achieve the functions of converging, integrating, and perturbing optical signals based on the MZI core structure. There is no need to configure additional complex multiplexing devices, such as Z-blocks and AWGs, which effectively simplifies the hardware architecture of the spectrometer module, reduces the size of the device, and is more conducive to on-chip integration. At the same time, the modular design and orderly connection logic of the MZI array reduces the debugging difficulty of multi-source access, reduces hardware deployment and maintenance costs, and enhances the practicality and industrialization potential of the spectrometer chip.

[0038] In step S120, the transmission response matrix of the pre-calibrated spectrometer module and the detection signal vector output by the photodetector are obtained.

[0039] In step S130, the absorption spectrum of the analyte is reconstructed using the detection signal vector and the transmission response matrix.

[0040] Specifically, before executing step S110, a mapping relationship between the phase modulation configuration of the spectrometer module and the light intensity transmission characteristics can be established using a standard light source with known spectral characteristics, to generate an M×N dimension transmission response matrix, where M represents the number of phase modulations and N represents the number of wavelength pixels, M≥N. That is, the output port of the standard light source with known spectral characteristics can be connected one-to-one with the input port of the spectrometer module, and the output port of the spectrometer module can be connected to a photodetector. When controlling the standard light source to output a light signal covering the target wavelength, the output light intensity corresponding to the standard light source can be collected by the photodetector to obtain the standard input light intensity spectrum. Subsequently, the first set of phase modulation signals is sent to the spectrometer module to control the phase state of the MZI. Simultaneously, after the spectrometer module performs the first phase modulation on the input light signal, the photodetector acquires the output light intensity of the spectrometer module, obtaining the first set of standard output light intensity spectra. Repeat the above operation, switch the M group phase modulation configurations, and obtain the M group standard output intensity spectra. to After obtaining the M sets of standard output light intensity spectra, the perturbation characteristics corresponding to each modulation configuration, i.e., the spectral response function, can be calculated using the light intensity relationships. ,Right now , and the disturbance characteristics of group M Arranged in rows, forming an M×N dimension transmission response matrix. The transmission response matrix is ​​then stored locally on the electronic device.

[0041] The spectrometer module works by illuminating the analyte with a light source signal, followed by a perturbed light signal. A photodetector then collects the reflected light signal, converts it into an analog electrical signal, and finally, an on-chip ADC converts the analog electrical signal into a digital signal. , Indicates the sampling time. For the first... The original digitized signal can be processed using formulas. Integrating over the wavelength dimension, we obtain the first... The detection signal value corresponding to the sub-modulation , Indicates the first The reflected light signal corresponding to the modulation is then M. Arranged in modulation order, they form a detection signal vector of length M.

[0042] After obtaining the detector signal vector and the transmission response matrix, the absorption spectrum of the analyte can be reconstructed using these parameters. ,in, This represents the transmission response matrix. This represents the probe signal vector. This indicates the absorption spectrum.

[0043] In this embodiment, the spectral reconstruction method relies on the unique hardware architecture of the multi-source spectrometer chip. Through a one-to-one correspondence between multiple narrowband light sources and multiple input ports of the spectrometer module, and leveraging the cascaded interference characteristics of the multi-stage Mach-Zehnder interferometer (MZI) in the spectrometer module, it achieves natural superposition and perturbation control of multi-source signals without the need for additional multiplexing devices. Combined with a pre-calibrated transmission response matrix, this method not only effectively overcomes the bottleneck of limited bandwidth of a single micro narrowband light source, enabling flexible expansion of the wide-spectrum detection range, but also avoids the energy attenuation of non-target bands introduced by traditional multiplexing devices due to the deliberate protection of channel isolation. It maximizes the preservation of the original signal energy of the light source, improving the information integrity and accuracy of the detection signal vector. Simultaneously, the method is deeply integrated with the chip's design, eliminating the need for complex multiplexing control logic. This simplifies the overall system complexity, reduces hardware cost and size, and ensures high accuracy and wide dynamic range of the analyte absorption spectrum reconstruction results through precise matching calculation of the transmission response matrix and the detection signal vector.

[0044] Secondly, this embodiment also provides a multi-source spectrometer chip, which includes a narrowband light source module, a spectrometer module, and a photodetector. The narrowband light source module includes multiple narrowband light sources, and the spectrometer module includes a multi-stage Mach-Zehnder interferometer cascade structure. The spectrometer module has multiple light input ports, the number of which matches the number of the multiple narrowband light sources. Multiple narrowband light sources are used to provide light source signals to multiple light input ports in a one-to-one correspondence with control signals. The spectrometer module is used to modulate at least one stage of the multi-stage Mach-Zehnder interferometer in response to control signals, so that the spectrometer module has a specific spectral response function in the current modulation state, and modulates the input light source signal to illuminate the test object with a perturbed light signal. The photodetector is used to detect the reflected light signal generated after the perturbed light signal illuminates the test object in response to control signals to obtain a detection signal vector. The detection signal vector is used together with the pre-calibrated transmission response matrix of the spectrometer module to reconstruct the absorption spectrum of the analyte.

[0045] The working principle of this multi-source spectrometer chip has been described in detail above and will not be repeated here.

[0046] Meanwhile, this embodiment also provides an electronic device, referring to Figure 5 As shown, Figure 5 This is a schematic diagram of the structure of an electronic device, which includes: One or more processors; A memory having stored one or more computer programs that, when executed by one or more processors, cause the one or more processors to implement the spectral reconstruction method of the multi-source spectrometer chip according to the first aspect of the invention.

[0047] The electronic device may also include one or more I / O interfaces connected between the processor and the memory, configured to enable information interaction between the processor and the memory.

[0048] Among them, the processor is a device with data processing capabilities, including but not limited to the central processing unit (CPU); the first memory is a device with data storage capabilities, including but not limited to random access memory (RAM, more specifically such as SDRAM, DDR, etc.), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory (FLASH); the I / O interface (read-write interface) is connected between the processor and the memory, enabling information exchange between the processor and the memory, including but not limited to the data bus (Bus).

[0049] In some embodiments, the processor, memory, and I / O interfaces are interconnected via a bus, and thus connected to other components of the computing device.

[0050] As a fourth aspect of the present invention, a computer-readable medium is provided, on which a computer program is stored, which, when executed by a processor, implements the spectral reconstruction method of the multi-source spectrometer chip provided in the first aspect of the present disclosure.

[0051] Those skilled in the art will understand that all or part of the processes in the methods of the above embodiments can be implemented by a computer program instructing related hardware. Accordingly, the computer program can be stored in a non-volatile computer-readable storage medium, and when executed, it can implement the methods of any of the above embodiments. Any references to memory, storage, databases, or other media used in the embodiments provided in this application can include non-volatile and / or volatile memory. Non-volatile memory may include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM), or flash memory. Volatile memory may include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in a variety of forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), dual data rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous link DRAM (SLDRAM), RAMbus direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).

[0052] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Those skilled in the art should understand that the present invention includes, but is not limited to, the contents described in the accompanying drawings and the specific embodiments above. Any modifications that do not depart from the functional and structural principles of the present invention will be included within the scope of the claims.

Claims

1. A method for spectral reconstruction of a multi-source spectrometer chip, characterized in that, The multi-source spectrometer chip includes a narrowband light source module, a spectrometer module, and a photodetector. The narrowband light source module includes multiple narrowband light sources, and the spectrometer module includes a multi-stage Mach-Zehnder interferometer cascade structure. The spectrometer module has multiple light input ports, the number of which matches the number of the multiple narrowband light sources. The method includes: A control signal is provided to the multi-source spectrometer chip to control multiple narrowband light sources to provide light source signals to multiple light input ports in a one-to-one correspondence. At the same time, the spectrometer module modulates at least one stage of the multi-stage Mach-Zehnder interferometer based on the control signal, so that the spectrometer module has a specific spectral response function in the current modulation state, and modulates the input light source signal, so that the perturbed light signal with corresponding perturbation illuminates the test object, and the photodetector detects the reflected light signal generated after the perturbed light signal illuminates the test object; Obtain the pre-calibrated transmission response matrix of the spectrometer module and the detection signal vector output by the photodetector; The absorption spectrum of the analyte is reconstructed using the detection signal vector and the transmission response matrix.

2. The spectral reconstruction method for a multi-source spectrometer chip according to claim 1, characterized in that, The multiple narrowband light sources have corresponding emission band ranges, and the combination of the emission band ranges corresponding to each narrowband light source constitutes the detection broadband of the light source spectrometer.

3. The spectral reconstruction method for a multi-source spectrometer chip according to claim 1, characterized in that, The number of narrowband light sources is two, and the multi-stage Mach-Zehnder interferometer cascade structure of the spectrometer module includes a series-type Mach-Zehnder interferometer (MZI) one-dimensional array, which has two input ports and two output ports. The step of illuminating the test object with a disturbed optical signal having a corresponding disturbance includes: the series-connected MZI one-dimensional array processing the light source signal to obtain the disturbed optical signal, and the two light output ports of the series-connected MZI one-dimensional array illuminating the test object with the disturbed optical signal.

4. The spectral reconstruction method for a multi-source spectrometer chip according to claim 1, characterized in that, The number of narrowband light sources is at least three; the multi-stage Mach-Zehnder interferometer cascade structure of the spectrometer module includes a convergent Mach-Zehnder interferometer (MZI) array and a series-connected tandem MZI one-dimensional array, wherein the convergent MZI array has the multiple input ports and two output ports. The step of illuminating the test object with a disturbed optical signal containing a corresponding disturbance includes: the converging MZI array processing the light source signal to obtain a converged optical signal; the two output ports transmitting the converged optical signal to the two input ports of the series-connected MZI one-dimensional array; the series-connected MZI one-dimensional array processing the converged optical signal to obtain a disturbed optical signal; and the two output ports of the series-connected MZI one-dimensional array illuminating the test object with the disturbed optical signal.

5. The spectral reconstruction method for a multi-source spectrometer chip according to claim 4, characterized in that, The convergent MZI array includes multiple MZI unit groups connected in sequence. The input ports of multiple MZIs in the first MZI unit group constitute multiple optical input ports of the convergent MZI array. The last MZI unit group includes two MZIs and the output ports of the two MZIs constitute two optical output ports of the convergent MZI array. For any MZI unit group connected first, the number of MZIs in it is greater than the number of MZIs in the MZI unit group connected to it, and optical signals are transmitted from one of the output ports of each MZI to the MZI unit group connected to it.

6. The spectral reconstruction method for a multi-source spectrometer chip according to any one of claims 1-5, characterized in that, The absorption spectrum of the analyte can be reconstructed using the following linear equation: ,in, This represents the transmission response matrix. This represents the probe signal vector. This indicates the absorption spectrum.

7. The spectral reconstruction method for a multi-source spectrometer chip according to claim 1, characterized in that, The narrowband light source is connected to the light input port via a lens or optical fiber coupling.

8. A multi-source spectrometer chip, characterized in that, The multi-source spectrometer chip includes a narrowband light source module, a spectrometer module, and a photodetector. The narrowband light source module includes multiple narrowband light sources, and the spectrometer module includes a multi-stage Mach-Zehnder interferometer cascade structure. The spectrometer module has multiple light input ports, the number of which matches the number of the multiple narrowband light sources. Multiple narrowband light sources are used to provide light source signals to multiple light input ports in a one-to-one correspondence with control signals. The spectrometer module is used to modulate at least one stage of the multi-stage Mach-Zehnder interferometer in response to control signals, so that the spectrometer module has a specific spectral response function in the current modulation state, and modulates the input light source signal to illuminate the test object with a perturbed light signal. The photodetector is used to detect the reflected light signal generated after the perturbed light signal illuminates the test object in response to control signals to obtain a detection signal vector. The detection signal vector is used together with the pre-calibrated transmission response matrix of the spectrometer module to reconstruct the absorption spectrum of the analyte.

9. An electronic device, characterized in that, include: One or more processors; A memory having stored one or more computer programs that, when executed by one or more processors, cause the one or more processors to implement the spectral reconstruction method for a multi-source spectrometer chip according to any one of claims 1 to 7.

10. A computer-readable medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the spectral reconstruction method of the multi-source spectrometer chip according to any one of claims 1 to 7.

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