Spatial electromagnetic radiation suppression device based on optical interference and method for configuring parameters thereof

Abstract

The application relates to a spatial electromagnetic radiation suppression device based on optical interference and a parameter configuration method thereof, and the spatial electromagnetic radiation suppression device comprises N-stage asymmetric Mach-Zehnder interference optical paths connected in a cascade mode, wherein N is an integer greater than or equal to 1; and the splitting ratio a of the N-stage asymmetric Mach-Zehnder interference optical paths n and the delay difference of two-arm optical paths Delta tau n meet the suppression amplitude requirement of each electromagnetic radiation leakage frequency and the power loss requirement of each system demand frequency. In the application, the structure of the N-stage asymmetric Mach-Zehnder interference optical paths connected in the cascade mode increases the suppression amplitude of the electromagnetic radiation leakage frequency, reduces the power loss of the system demand frequency, fully plays the anti-electromagnetic interference advantage of the optical, and the adopted structure is a mature technology, is simple to realize, and is cost-effective.

Description

Technical Field

[0001] This invention belongs to the field of microwave photonics technology and relates to a space electromagnetic radiation suppression device based on optical interference and its parameter configuration method. Background Technology

[0002] Optical frequency combs, composed of a series of equally spaced frequency teeth in the optical spectrum, have become one of the most popular research directions in the field of optics over the past decade. Since the concept of optical frequency combs was first proposed, their generation methods can be broadly classified into four categories based on their different principles: mode-locked laser method, cyclic frequency shifter method, fiber nonlinear effect method, and external modulator method. Due to their advantages such as large bandwidth, high stability, and rich spectrum, optical frequency combs have significant application value in fields such as satellite navigation, aerospace, deep space exploration, and reconnaissance and early warning.

[0003] Electronic information equipment is often characterized by system complexity, high integration, and a large number and variety of interconnected interfaces, resulting in diverse sources of electromagnetic interference (EMI) and their occurrence at various times. Furthermore, due to limitations in size, weight, and installation location, different types of electronic information equipment are often densely installed in confined spaces, placing particularly stringent requirements on the EMI of each electronic device. Failure to comply can lead to reduced performance, malfunction, or even safety incidents. Because optical frequency combs have a rich spectrum, containing numerous redundant spectral components for user equipment, photoelectric conversion and its back-end processing circuits (modules) can become sources of EMI. Therefore, it is necessary to suppress the electromagnetic radiation of unwanted frequency components from optical frequency combs. Summary of the Invention

[0004] To address the shortcomings of the prior art, the technical problem to be solved by the present invention is to provide a space electromagnetic radiation suppression device based on optical interference and its parameter configuration method.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A space electromagnetic radiation suppression device based on optical interferometry, comprising: N The stages employ an asymmetric Mach-Zehnder interferometer optical path connected in a cascaded manner, wherein... N For any electromagnetic radiation leakage frequency and system required frequency, the splitting ratio and the time delay difference between the two arms of the asymmetric Mach-Zehnder interferometer optical path at each stage satisfy the following conditions:

[0007]

[0008] In the formula, Indicates the first n The splitting ratio of an asymmetric Mach-Zehnder interference optical path; Dt n Indicates the firstn The time delay difference between the two arms of the asymmetric Mach-Zehnder interferometer optical path; f i Indicates the pre-set number i One electromagnetic radiation leakage frequency; 1≤ i ≤ G , G This represents the total number of electromagnetic radiation leakage frequencies. A i express f i The amplitude needs to be suppressed; A i ≥ A min , A min This represents the minimum suppression amplitude for electromagnetic radiation leakage frequency; f k Indicates the pre-set number k The system demand frequency; 1≤ k ≤ H , H This represents the total number of frequencies required by the system. T k express f k The allowable power loss; T k ≤ T max , T max This indicates the maximum power loss allowed by the system's required frequency.

[0009] Furthermore, the aforementioned N The asymmetric Mach-Zehnder interferometer optical path connected in a cascade manner includes ( N +1) The optical couplers are cascaded using optical fibers; wherein, the first-stage optical coupler is a 1×2 optical coupler or a 2×2 optical coupler, the last-stage optical coupler is a 2×1 optical coupler or a 2×2 optical coupler, and the remaining optical couplers are all 2×2 optical couplers; the 1×2 optical coupler has one input terminal and two output terminals, the 2×2 optical coupler has two input terminals and two output terminals, and the 2×1 optical coupler has two input terminals and one output terminal.

[0010] Furthermore, the input terminal of the first-stage optical coupler serves as the input terminal of the space electromagnetic radiation suppression device for connecting to the optical frequency comb;

[0011] The two inputs of the last stage optical coupler are connected to the two outputs of the previous stage optical coupler via optical fibers. The output of the last stage optical coupler is used as the output of the space electromagnetic radiation suppression device to connect to the back-end system equipment.

[0012] when N When ≥2, the two input ends of each 2×2 optical coupler between the first and last stages are connected to the two output ends of the previous stage optical coupler via optical fibers.

[0013] Furthermore, the 1×2 optical coupler includes a first “Y” branch waveguide for splitting and two first output arms respectively connected to the two output ends of the first “Y” branch waveguide. The input end of the first “Y” branch waveguide is the input end of the 1×2 optical coupler, and the non-connected ends of the two first output arms are the two output ends of the 1×2 optical coupler.

[0014] The 2×2 optical coupler includes a second "Y" branch waveguide for combining and a third "Y" branch waveguide for splitting; the two input terminals of the second "Y" branch waveguide are respectively connected to a second input arm, the output terminal of the second "Y" branch waveguide is connected to the input terminal of the third "Y" branch waveguide, and the two output terminals of the third "Y" branch waveguide are respectively connected to a second output arm; the non-connected terminals of the two second input arms are the two input terminals of the 2×2 optical coupler, and the non-connected terminals of the two second output arms are the two output terminals of the 2×2 optical coupler;

[0015] The 2×1 optical coupler includes a fourth “Y” branch waveguide for combining and two first input arms connected to the two input ends of the fourth “Y” branch waveguide respectively; the non-connected ends of the two first input arms are the two input ends of the 2×1 optical coupler, and the output end of the fourth “Y” branch waveguide is the output end of the 2×1 optical coupler.

[0016] Furthermore, when N =1, and when the first-stage optical coupler is a 1×2 optical coupler and the second-stage optical coupler is a 2×1 optical coupler, the first-stage asymmetric Mach-Zehnder interference optical path includes a 1×2 optical coupler, a 2×1 optical coupler, and an optical fiber connecting the two first output arms of the 1×2 optical coupler and the two first input arms of the 2×1 optical coupler.

[0017] Furthermore, when the first-stage optical coupler is a 1×2 optical coupler and the second-stage optical coupler is a 2×2 optical coupler, the first-stage asymmetric Mach-Zehnder interference optical path includes the 1×2 optical coupler, the second "Y" branch waveguide and two second input arms in the cascaded 2×2 optical coupler, and the optical fiber connecting the two second input arms of the 2×2 optical coupler to the two first output arms of the 1×2 optical coupler;

[0018] When both the first-stage and second-stage optical couplers are 2×2 optical couplers, the first-stage asymmetric Mach-Zehnder interference optical path includes the third “Y” branch waveguide and two second output arms in the first-stage 2×2 optical coupler, the second “Y” branch waveguide and two second input arms in the second-stage 2×2 optical coupler, and the optical fiber connecting the two second input arms of the second-stage 2×2 optical coupler and the two second output arms of the first-stage 2×2 optical coupler.

[0019] When the last stage optical coupler is a 2×1 optical coupler and its preceding stage optical coupler is a 2×2 optical coupler, the last stage asymmetric Mach-Zehnder interference optical path includes a 2×1 optical coupler, a third “Y” branch waveguide in the cascaded 2×2 optical coupler and two second output arms, and an optical fiber connecting the two first input arms of the 2×1 optical coupler and the two second output arms of the 2×2 optical coupler.

[0020] When both the last-stage optical coupler and its preceding stage optical coupler are 2×2 optical couplers, the last-stage asymmetric Mach-Zehnder interference optical path includes the second “Y” branch waveguide and two second input arms in the last-stage 2×2 optical coupler, the third “Y” branch waveguide and two second output arms in its preceding stage 2×2 optical coupler, and the optical fiber connecting the two second input arms of the last-stage 2×2 optical coupler and the two second output arms of its preceding stage 2×2 optical coupler.

[0021] Furthermore, when N When ≥3, each asymmetric Mach-Zehnder interference optical path between the first and last stages includes the third “Y” branch waveguide and two second output arms in the previous stage 2×2 optical coupler, the second “Y” branch waveguide and two second input arms in the next stage 2×2 optical coupler, and the optical fiber connecting the two second input arms of the next stage 2×2 optical coupler and the two second output arms of the previous stage 2×2 optical coupler.

[0022] A parameter configuration method for a space electromagnetic radiation suppression device based on optical interferometry, comprising the following steps:

[0023] S1. Set the initial order of the asymmetric Mach-Zehnder interference optical path to 1; and determine the parameter boundaries of the asymmetric Mach-Zehnder interference optical path as follows:

[0024] 1≤ N ≤ +∞ ;

[0025] 0≤ ≤1;

[0026] 0≤ Dt n ≤1 / f0;

[0027] S2. Set the electromagnetic radiation leakage frequencies. f i and the corresponding required suppression amplitude A i ; A i ≥ A min Set the required frequencies for each system. f k and the corresponding allowable power loss T k ; T k ≤ T max ; and setting the splitting ratio of each level of asymmetric Mach-Zehnder interference optical path. and the time difference of optical path delay between the two arms Dt n The initial value;

[0028] S3. Calculate the leakage frequency for any given electromagnetic radiation. f i and system demand frequency f k , and Dt n Do all of the following conditions be met:

[0029]

[0030] If the above conditions are met, the configuration process ends; if there is one or more electromagnetic radiation leakage frequencies... f i or system demand frequency f k If the above conditions are not met, proceed to step S4;

[0031] S4. Spectroscopy ratio for each level of asymmetric Mach-Zehnder interference optical path and the time difference of optical path delay between the two arms Dt n Adjust the value and return to execute step S3; if all values ​​have been adjusted... and Dt n If the condition still cannot be met after taking the value, then step S5 is executed;

[0032] S5, Judgment A i Is it greater than A min ,like A i > Amin Then decrease A i If the condition is met, proceed to step S3; otherwise, proceed to step S6.

[0033] S6, Judgment T k Is it less than T max ,like T k < T max Then increase T k and reset A i If the condition is met, proceed to step S3; otherwise, proceed to step S7.

[0034] S7. The order of asymmetric Mach-Zehnder interference optical paths N Add one level, reset A i and T k Return to step S3.

[0035] Furthermore, the time delay difference between the two arms of the asymmetric Mach-Zehnder interferometer optical path Dt n The measurement method is one of the following: oscilloscope time-domain electrical pulse interval measurement, vector network analyzer time-domain transformation and / or amplitude-phase analysis, optical time-domain reflection length measurement, and optical frequency-domain reflection length measurement.

[0036] Furthermore, the time delay difference between the two arms of the asymmetric Mach-Zehnder interferometer optical path Dt n The adjustment method is to perform high-precision fiber optic cutting or fiber end face grinding.

[0037] In this invention, by N The structure of the asymmetric Mach-Zehnder interferometer optical path, which uses a cascaded connection, increases the suppression amplitude of electromagnetic radiation leakage frequencies while reducing power loss at the required system frequencies. This structure fully leverages the electromagnetic interference resistance advantages of optics, and the structures employed are all mature technologies, making implementation simple and cost-effective. By sequentially adjusting the splitting ratio and the delay difference between the two arms of the asymmetric Mach-Zehnder interferometer optical path, the required suppression amplitude of electromagnetic radiation leakage frequencies, the allowable power loss at the required system frequencies, and the number of stages of the asymmetric Mach-Zehnder interferometer optical path, a space electromagnetic radiation suppression device structure with the minimum number of stages can be obtained, satisfying both the suppression amplitude of electromagnetic radiation leakage frequencies and the allowable power loss at the required system frequencies. The suppression amplitude and power loss indicators of the space electromagnetic radiation suppression device are also obtained. Attached Figure Description

[0038] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0039] Figure 1 This is a structural block diagram of an embodiment of the space electromagnetic radiation suppression device based on optical interference of the present invention.

[0040] Figure 2 This is a schematic diagram of a 1×2 optical coupler.

[0041] Figure 3 This is a schematic diagram of a 2×2 optical coupler.

[0042] Figure 4 This is a schematic diagram of a 2×1 optical coupler.

[0043] Figure 5 This is a schematic diagram of the asymmetric Mach-Zehnder interference optical path in Example 1, where the three stages are connected in a cascade manner.

[0044] Figure 6 This is a schematic diagram of the asymmetric Mach-Zehnder interference optical path in Example 2, where the two stages are connected in a cascade manner.

[0045] Figure 7 This is a flowchart of an embodiment of the parameter configuration method for the space electromagnetic radiation suppression device based on optical interference according to the present invention.

[0046] The meanings of the labels in the attached diagram are as follows:

[0047] 1×2 optical coupler-101; First “Y” branch waveguide-111; First output arm-121;

[0048] 2×2 optical couplers - 201, 202, 203, 204, 205; second "Y" branch waveguide - 211; third "Y" branch waveguide - 212; first input arm - 221; second output arm - 222;

[0049] 2×1 optical coupler-301; fourth “Y” branch waveguide-311; second input arm-321;

[0050] Fiber optic cable - 400; First-order asymmetric Mach-Zehnder interferometer optical path - 910; Second-order asymmetric Mach-Zehnder interferometer optical path - 920; Third-order asymmetric Mach-Zehnder interferometer optical path - 930. Detailed Implementation

[0051] The following specific examples illustrate the implementation of the present invention. The illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0052] Example 1

[0053] Please see Figure 1 , Figure 1 This is a structural block diagram of an embodiment of the space electromagnetic radiation suppression device based on optical interferometry of the present invention. The space electromagnetic radiation suppression device based on optical interferometry in this embodiment includes... N The stages employ an asymmetric Mach-Zehnder interferometer optical path connected in a cascaded manner, wherein... N ≥1, and N The integers are given. For any electromagnetic radiation leakage frequency and the system requirement frequency, the splitting ratio and the time delay difference between the two arms of the asymmetric Mach-Zehnder interferometer optical path at each stage satisfy the following conditions:

[0054]

[0055] In the formula, ( n (integer) represents the first n The splitting ratio of an asymmetric Mach-Zehnder interference optical path; Dt n Indicates the first n The time delay difference between the two arms of the asymmetric Mach-Zehnder interferometer optical path. f i Indicates the pre-set number i One electromagnetic radiation leakage frequency; 1≤ i ≤ G , G This represents the total number of electromagnetic radiation leakage frequencies. A i express f i The amplitude needs to be suppressed; A i ≥ A min , A min This represents the minimum suppression level for electromagnetic radiation leakage frequency, and can be used as the suppression level that the customer / system requires to achieve. A min . f k ( k (integer) represents the pre-defined first... k The system demand frequency; 1≤ k ≤ H , H This represents the total number of frequencies required by the system.T k express f k The allowable power loss; T k ≤ T max , T max This indicates the maximum allowable power loss at the required system frequency. The power loss value that the customer / system is not allowed to exceed can be used as... T max .

[0056] In this embodiment, the N The asymmetric Mach-Zehnder interferometer optical path, which is cascaded, includes a 1×2 optical coupler 101, a 2×1 optical coupler 301, and optical fibers 400 cascaded between the 1×2 optical coupler 101 and the 2×1 optical coupler 301. N -1 level) 2×2 optical coupler.

[0057] Please see Figure 2 The 1×2 optical coupler 101 has one input terminal and two output terminals. The input terminal of the 1×2 optical coupler 101 serves as the input terminal of a space electromagnetic radiation suppression device for connecting to an optical frequency comb. The 1×2 optical coupler 101 includes a first "Y" branch waveguide 111 for branching and two first output arms 121 respectively connected to the two output terminals of the first "Y" branch waveguide 111. The input terminal of the first "Y" branch waveguide 111 is the input terminal of the 1×2 optical coupler 101, and the non-connected terminals of the two first output arms 121 are the two output terminals of the 1×2 optical coupler 101.

[0058] Please see Figure 3 The second-stage 2×2 optical coupler has two input terminals and two output terminals. The two input terminals of each stage of the 2×2 optical coupler are connected to the two output terminals of the previous stage optical coupler via optical fiber 400. The 2×2 optical coupler includes a second "Y" branch waveguide 211 for combining and a third "Y" branch waveguide 212 for splitting. The two input terminals of the second "Y" branch waveguide 211 are each connected to a first input arm 221. The output terminal of the second "Y" branch waveguide 211 is connected to the input terminal of the third "Y" branch waveguide 212. The two output terminals of the third "Y" branch waveguide 212 are each connected to a second output arm 222. The non-connected terminals of the two first input arms 221 are the two input terminals of the 2×2 optical coupler, and the non-connected terminals of the two second output arms 222 are the two output terminals of the 2×2 optical coupler.

[0059] Please see Figure 4The 2×1 optical coupler 301 has two input terminals and one output terminal. The two input terminals of the 2×1 optical coupler 301 are respectively connected to the two output terminals of the preceding optical coupler via optical fibers 400. The output terminal of the 2×1 optical coupler 301 serves as the output terminal of the space electromagnetic radiation suppression device for connecting to system equipment. The 2×1 optical coupler 301 includes a fourth "Y" branch waveguide 311 for combining and two second input arms 321 respectively connected to the two input terminals of the fourth "Y" branch waveguide 311. The non-connected ends of the two second input arms 321 are the two input terminals of the 2×1 optical coupler 301, and the output terminal of the fourth "Y" branch waveguide 311 is the output terminal of the 2×1 optical coupler 301.

[0060] The following is based on N The structure of the space electromagnetic radiation suppression device in this embodiment will be described using example 3. Please refer to [reference needed]. Figure 5 The third-order asymmetric Mach-Zehnder interferometer optical path includes a 1×2 optical coupler 101, two 2×2 optical couplers (201, 202), and a 2×1 optical coupler 301. The first-order asymmetric Mach-Zehnder interferometer optical path 910 includes the 1×2 optical coupler 101, the second “Y” branch waveguide 211 in the 2×2 optical coupler 201, two first input arms 221, and an optical fiber 400 connecting the two first input arms 221 of the 2×2 optical coupler 201 to the two first output arms 121 of the 1×2 optical coupler 101.

[0061] The second-stage asymmetric Mach-Zehnder interferometer optical path 920 includes a third “Y” branch waveguide 212 and two second output arms 222 in a 2×2 optical coupler 201, a second “Y” branch waveguide 211 and two first input arms 221 in a 2×2 optical coupler 202, and an optical fiber 400 connecting the two first input arms 221 of the 2×2 optical coupler 202 and the two second output arms 222 of the 2×2 optical coupler 201.

[0062] The third-order asymmetric Mach-Zehnder interferometer optical path 930 includes a 2×1 optical coupler 301, a third “Y” branch waveguide 212 in a 2×2 optical coupler 202, two second output arms 222, and an optical fiber 400 connecting the two second input arms 321 of the 2×1 optical coupler 301 and the two second output arms 222 of the 2×2 optical coupler 202.

[0063] Based on the example above, it's easy to understand that adding a 2×2 optical coupler between the 1×2 optical coupler 101 and the 2×1 optical coupler 301 adds one stage of asymmetric Mach-Zehnder interference optical path. Similarly, removing one 2×2 optical coupler reduces the corresponding stage of asymmetric Mach-Zehnder interference optical path. When NWhen =1, the asymmetric Mach-Zehnder interference optical path includes only a 1×2 optical coupler 101 and a 2×1 optical coupler 301, as well as an optical fiber 400 connecting the two first output arms 121 of the 1×2 optical coupler 101 and the two second input arms 321 of the 2×1 optical coupler 301.

[0064] In this embodiment, through N The structure of the asymmetric Mach-Zehnder interference optical path, which is connected in a cascade manner, increases the suppression of electromagnetic radiation leakage frequencies (i.e., unwanted frequencies) while reducing power loss at the system's required frequencies (i.e., the frequencies needed by the system). The above structure fully leverages the electromagnetic interference resistance advantages of optics, and the structures used are all mature technologies, which are simple to implement and cost-effective.

[0065] Example 2

[0066] In this embodiment, () N +1) The optocouplers are connected in a cascaded manner to form a... N The optical path employs a cascaded asymmetric Mach-Zehnder interference pattern; and each stage of the optical coupler is a 2×2 optical coupler, the structure of which is the same as in Embodiment 1. The two input terminals of the first-stage 2×2 optical coupler serve as input terminals for a space electromagnetic radiation suppression device, each used to connect to an optical frequency comb; the two output terminals of the last-stage 2×2 optical coupler serve as output terminals for the space electromagnetic radiation suppression device, used to connect to system equipment; the two input terminals of each 2×2 optical coupler between the first and last stages are connected to the two output terminals of the preceding stage optical coupler via optical fiber 400.

[0067] The structure of the space electromagnetic radiation suppression device in this embodiment will be described below using N=2 as an example. Please refer to [link / reference]. Figure 6 The two-stage asymmetric Mach-Zehnder interference optical path includes three 2×2 optical couplers (203, 204, 205). The first-stage asymmetric Mach-Zehnder interference optical path 910 includes a third “Y” branch waveguide 212 and two second output arms 222 in the 2×2 optical coupler 203, a second “Y” branch waveguide 211 and two second input arms 221 in the 2×2 optical coupler 204, and two optical fibers 400 connecting the two second input arms 221 of the 2×2 optical coupler 204 and the two second output arms 222 of the 2×2 optical coupler 203. The non-connection ends of the two second input arms 221 of the 2×2 optical coupler 203 serve as the two input ends of a space electromagnetic radiation suppression device, each used to connect to an optical frequency comb.

[0068] The second-stage asymmetric Mach-Zehnder interferometer optical path 920 includes a third “Y” branch waveguide 212 and two second output arms 222 in a 2×2 optical coupler 204, a second “Y” branch waveguide 211 and two second input arms 221 in a 2×2 optical coupler 205, and two optical fibers 400 connecting the two second input arms 221 of the 2×2 optical coupler 205 and the two second output arms 222 of the 2×2 optical coupler 204. The non-connection ends of the two second output arms 222 of the 2×2 optical coupler 205 serve as the two output ends of a space electromagnetic radiation suppression device, each used to connect to a system device.

[0069] As can be easily understood from the example above, each additional 2×2 optical coupler after the 2×2 optical coupler 203 adds one stage of asymmetric Mach-Zehnder interference optical path. Similarly, each removal of a 2×2 optical coupler reduces one stage of asymmetric Mach-Zehnder interference optical path.

[0070] With the structure of this embodiment, since the space electromagnetic radiation suppression device has two input terminals and two output terminals, the two connected optical frequency combs can be used as one main and one backup through time division multiplexing, and can provide output signals to two system devices at the same time.

[0071] Based on Embodiments 1 and 2, it is easy to understand that the first-stage optical coupler can also be set as a 2×2 optical coupler and the last-stage optical coupler can be set as a 2×1 optical coupler 301; or the first-stage optical coupler can be set as a 1×2 optical coupler 101 and the last-stage optical coupler can be set as a 2×2 optical coupler.

[0072] Example 3

[0073] Please see Figure 7 , Figure 7 This is a flowchart of an embodiment of the parameter configuration method for a space electromagnetic radiation suppression device based on optical interferometry according to the present invention. The parameter configuration method of this embodiment is used to configure the parameters of the space electromagnetic radiation suppression device based on optical interferometry, thereby obtaining a space electromagnetic radiation suppression device structure with the minimum number of stages that meets the requirements for both the suppression amplitude at the electromagnetic radiation leakage frequency and the allowable power loss at the system's required frequency, and obtaining the suppression amplitude index and power loss index of the space electromagnetic radiation suppression device. The parameter configuration method of this embodiment includes the following steps:

[0074] S1. Set the initial order of the asymmetric Mach-Zehnder interference optical path. Generally, the initial order of the asymmetric Mach-Zehnder interference optical path is set to... N =1. And the parameter boundary of the asymmetric Mach-Zehnder interference optical path is determined as follows:

[0075] 1≤ N ≤ +∞ ;

[0076] 0≤ ≤1;

[0077] 0≤ Dt n ≤1 / f 0;

[0078] S2. Set the electromagnetic radiation leakage frequencies. f i and the corresponding required suppression amplitude A i And set the required frequency for each system. f k and the corresponding allowable power loss T k . A i The value needs to satisfy A i ≥ A min ; T k The value needs to satisfy T k ≤ T max Therefore, under the conditions of satisfying the minimum suppression amplitude of electromagnetic radiation leakage frequency and the maximum allowable power loss of the system demand frequency, it is possible to find the suppression amplitude value of electromagnetic radiation leakage frequency and the power loss value of the system demand frequency that are close to the actual performance of the space electromagnetic radiation suppression device.

[0079] Setting the splitting ratio of each level of the asymmetric Mach-Zehnder interference optical path and the time difference of optical path delay between the two arms Dt n The initial values. For example, the parameters of each level of the asymmetric Mach-Zehnder interference optical path can be set as follows: =0; Dt i =0.

[0080] S3. Calculate the leakage frequency for any given electromagnetic radiation. f i and system demand frequency f k , and Dt n Do all of the following conditions be met:

[0081]

[0082] For any electromagnetic radiation leakage frequency fi and the frequency required by any system f k , and Dt n If all values ​​satisfy the above conditions, then it means and Dt n The values ​​now meet the requirements, and the configuration can be completed. This will allow for the adjustment of the asymmetric Mach-Zehnder interferometer optical paths at each stage. and Dt n The value of is used as the parameter of each level of the asymmetric Mach-Zehnder interference optical path, at which point A i This value can be used as the suppression amplitude parameter for the electromagnetic radiation leakage frequency of a space electromagnetic radiation suppression device. T k This can be used as the value of the power loss parameter for the system's required frequency in a space electromagnetic radiation suppression device. If and Dt n The value for one or more electromagnetic radiation leakage frequencies f i or system demand frequency f k If the above conditions are not met, then it means and Dt n The value does not meet the requirements. Perform step S4 to adjust it.

[0083] S4. Spectroscopy ratio for each level of asymmetric Mach-Zehnder interference optical path and the time difference of optical path delay between the two arms Dt n The value is adjusted. If after adjustment and Dt n The value for any electromagnetic radiation leakage frequency f i and the frequency required by any system f k If all conditions are met, the configuration ends, and the asymmetric Mach-Zehnder interferometer optical paths at each stage are then configured. and Dt n The value of is used as the parameter of each level of the asymmetric Mach-Zehnder interference optical path; at this time A i The value of the suppression amplitude parameter, which is the electromagnetic radiation leakage frequency of the space electromagnetic radiation suppression device, will be used at this time. T k The value of the power loss parameter at the system's required frequency, which is used as a space electromagnetic radiation suppression device. Otherwise, continue with... and Dt n Adjust the value until... and Dt n The value for any electromagnetic radiation leakage frequency f i and the frequency required by any system f k All conditions are met. If all are adjusted... and Dt n If even after considering all possible values, the conditions still cannot be fully met, then it means that the existing conditions cannot be achieved. T k and A i To meet the requirements, perform step S5 first. T k Adjustments will be made.

[0084] S5, Judgment A i Is it greater than A min ,like A i > A min Then decrease A i Return to step S3 to continue the judgment and adjustment. If A i = A min This indicates an adjustment. A i Unable to make and Dt n If the value meets the requirement, execute step S6. T k Adjustments will be made.

[0085] S6, Judgment T k Is it less than T max ,like T k < T max Then increase T k and reset A i Return to step S3 to continue the judgment and adjustment. If T k = T max This indicates that the existing series of asymmetric Mach-Zehnder interference optical paths are being used. and Dt n If the value cannot meet the requirements, execute step S7 to increase the order of the asymmetric Mach-Zehnder interference optical path.

[0086] S7. Increase the order of the asymmetric Mach-Zehnder interference optical path by one level, i.e. N=N +1; Reset A i and T k Then return to step S3 to continue the judgment and adjustment. This allows the number of stages to be increased only when the existing number of stages in the asymmetric Mach-Zehnder interference optical path is indeed insufficient to meet the requirements, so as to meet the electromagnetic radiation leakage frequency requirements, suppression amplitude requirements, and allowable power loss requirements of the system's required frequency with the simplest structure.

[0087] After obtaining the parameters of each level of the asymmetric Mach-Zehnder interference optical path, the asymmetric Mach-Zehnder interference optical path can be fabricated according to the parameter values. During the fabrication process, the splitting ratio of each level of the asymmetric Mach-Zehnder interference optical path is measured. and the time difference of optical path delay between the two arms Dt n The method can be one of the following: oscilloscope time-domain electrical pulse interval measurement, vector network analyzer time-domain analysis and amplitude-phase analysis, optical time-domain reflection length measurement, or optical frequency-domain reflection length measurement. The time delay difference between the two arms of the asymmetric Mach-Zehnder interferometer optical path is also considered. Dt n The adjustment method is to perform high-precision fiber 400 cutting or fiber 400 end face grinding.

[0088] In this embodiment, the connection is made using a cascaded method. N By setting parameters for the structure of the asymmetric Mach-Zehnder interferometer optical path, and by sequentially adjusting the splitting ratio and delay difference of the two arms, the required suppression amplitude of electromagnetic radiation leakage frequency, the allowable power loss of the system's required frequency, and the number of stages of the asymmetric Mach-Zehnder interferometer optical path, a space electromagnetic radiation suppression device structure with the minimum number of stages that meets the requirements for both the suppression amplitude of electromagnetic radiation leakage frequency and the allowable power loss of the system's required frequency can be obtained. The suppression amplitude index and power loss index of the space electromagnetic radiation suppression device are also obtained.

[0089] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A space electromagnetic radiation suppression device based on optical interference, characterized in that: include N The stages employ an asymmetric Mach-Zehnder interferometer optical path connected in a cascaded manner, wherein... N For any electromagnetic radiation leakage frequency and system required frequency, the splitting ratio and the time delay difference between the two arms of the asymmetric Mach-Zehnder interferometer optical path at each stage satisfy the following conditions: In the formula, Indicates the first n The splitting ratio of an asymmetric Mach-Zehnder interference optical path; Δτ n Indicates the first n The time delay difference between the two arms of the asymmetric Mach-Zehnder interferometer optical path; f i Indicates the pre-set number i One electromagnetic radiation leakage frequency; 1≤ i ≤ G , G This represents the total number of electromagnetic radiation leakage frequencies. A i express f i The amplitude needs to be suppressed; A i ≥ A min , A min This represents the minimum suppression amplitude for electromagnetic radiation leakage frequency; f k Indicates the pre-set number k The system demand frequency; 1≤ k ≤ H , H This represents the total number of frequencies required by the system. T k express f k The allowable power loss; T k ≤ T max , T max This indicates the maximum power loss allowed by the system's required frequency.

2. The space electromagnetic radiation suppression device based on optical interference according to claim 1, characterized in that: The N The asymmetric Mach-Zehnder interferometer optical path connected in a cascade manner includes ( N +1) The optical couplers are cascaded using optical fibers; wherein, the first-stage optical coupler is a 1×2 optical coupler or a 2×2 optical coupler, the last-stage optical coupler is a 2×1 optical coupler or a 2×2 optical coupler, and the remaining optical couplers are all 2×2 optical couplers; the 1×2 optical coupler has one input terminal and two output terminals, the 2×2 optical coupler has two input terminals and two output terminals, and the 2×1 optical coupler has two input terminals and one output terminal.

3. The space electromagnetic radiation suppression device based on optical interference according to claim 2, characterized in that: The input terminal of the first-stage optical coupler serves as the input terminal of the space electromagnetic radiation suppression device and is used to connect to the optical frequency comb. The two inputs of the last stage optical coupler are connected to the two outputs of the previous stage optical coupler via optical fibers. The output of the last stage optical coupler is used as the output of the space electromagnetic radiation suppression device to connect to the back-end system equipment. when N When ≥2, the two input ends of each 2×2 optical coupler between the first and last stages are connected to the two output ends of the previous stage optical coupler via optical fibers.

4. The space electromagnetic radiation suppression device based on optical interference according to claim 3, characterized in that: The 1×2 optical coupler includes a first "Y" branch waveguide for splitting and two first output arms connected to the two output ends of the first "Y" branch waveguide respectively. The input end of the first "Y" branch waveguide is the input end of the 1×2 optical coupler, and the non-connected ends of the two first output arms are the two output ends of the 1×2 optical coupler. The 2×2 optical coupler includes a second "Y" branch waveguide for combining and a third "Y" branch waveguide for splitting; the two input terminals of the second "Y" branch waveguide are respectively connected to a second input arm, the output terminal of the second "Y" branch waveguide is connected to the input terminal of the third "Y" branch waveguide, and the two output terminals of the third "Y" branch waveguide are respectively connected to a second output arm; the non-connected terminals of the two second input arms are the two input terminals of the 2×2 optical coupler, and the non-connected terminals of the two second output arms are the two output terminals of the 2×2 optical coupler; The 2×1 optical coupler includes a fourth "Y" branch waveguide for combining and two first input arms connected to the two input ends of the fourth "Y" branch waveguide respectively; the non-connected ends of the two first input arms are the two input ends of the 2×1 optical coupler, and the output end of the fourth "Y" branch waveguide is the output end of the 2×1 optical coupler.

5. The space electromagnetic radiation suppression device based on optical interference according to claim 4, characterized in that: when N =1, and when the first-stage optical coupler is a 1×2 optical coupler and the second-stage optical coupler is a 2×1 optical coupler, the first-stage asymmetric Mach-Zehnder interference optical path includes a 1×2 optical coupler, a 2×1 optical coupler, and an optical fiber connecting the two first output arms of the 1×2 optical coupler and the two first input arms of the 2×1 optical coupler.

6. The space electromagnetic radiation suppression device based on optical interference according to claim 4, characterized in that: When the first-stage optical coupler is a 1×2 optical coupler and the second-stage optical coupler is a 2×2 optical coupler, the first-stage asymmetric Mach-Zehnder interference optical path includes a 1×2 optical coupler, a second "Y" branch waveguide in the cascaded 2×2 optical coupler, two second input arms, and an optical fiber connecting the two second input arms of the 2×2 optical coupler to the two first output arms of the 1×2 optical coupler. When both the first-stage and second-stage optical couplers are 2×2 optical couplers, the first-stage asymmetric Mach-Zehnder interference optical path includes the third "Y" branch waveguide and two second output arms in the first-stage 2×2 optical coupler, the second "Y" branch waveguide and two second input arms in the second-stage 2×2 optical coupler, and the optical fiber connecting the two second input arms of the second-stage 2×2 optical coupler and the two second output arms of the first-stage 2×2 optical coupler. When the last stage optical coupler is a 2×1 optical coupler and its preceding stage optical coupler is a 2×2 optical coupler, the last stage asymmetric Mach-Zehnder interference optical path includes a 2×1 optical coupler, a third "Y" branch waveguide in the cascaded 2×2 optical coupler, two second output arms, and an optical fiber connecting the two first input arms of the 2×1 optical coupler to the two second output arms of the 2×2 optical coupler. When both the last-stage optical coupler and its preceding stage optical coupler are 2×2 optical couplers, the last-stage asymmetric Mach-Zehnder interference optical path includes the second "Y" branch waveguide and two second input arms in the last-stage 2×2 optical coupler, the third "Y" branch waveguide and two second output arms in its preceding stage 2×2 optical coupler, and the optical fiber connecting the two second input arms of the last-stage 2×2 optical coupler and the two second output arms of its preceding stage 2×2 optical coupler.

7. The space electromagnetic radiation suppression device based on optical interference according to claim 6, characterized in that: when N When ≥3, each asymmetric Mach-Zehnder interferometer optical path between the first and last stages includes the third "Y" branch waveguide and two second output arms in the previous 2×2 optical coupler, the second "Y" branch waveguide and two second input arms in the next 2×2 optical coupler, and the optical fiber connecting the two second input arms of the next 2×2 optical coupler and the two second output arms of the previous 2×2 optical coupler.

8. A parameter configuration method for a space electromagnetic radiation device based on optical interferometry, characterized in that, Configuring the parameters of the optical interference-based space electromagnetic radiation suppression device as described in any one of claims 1 to 7 includes the following steps: S1. Set the initial order of the asymmetric Mach-Zehnder interference optical path to 1; and determine the parameter boundaries of the asymmetric Mach-Zehnder interference optical path as follows: 1≤ N ≤ +∞ ； 0≤ ≤1； 0≤ Δτ n ≤1 / f 0； S2. Set the electromagnetic radiation leakage frequencies. f i and the corresponding required suppression amplitude A i ; A i ≥ A min Set the required frequencies for each system. f k and the corresponding allowable power loss T k ; T k ≤ T max ; and setting the splitting ratio and the time delay difference between the two arms of the asymmetric Mach-Zehnder interferometer optical path at each stage. Δτ n The initial value; S3. Calculate the leakage frequency for any given electromagnetic radiation. f i and system demand frequency f k , and Δτ n Do all of the following conditions be met: If the above conditions are met, the configuration process ends; if there is one or more electromagnetic radiation leakage frequencies... f i Or system demand frequency f k If the above conditions are not met, proceed to step S4; S4. Spectroscopy ratio for each level of asymmetric Mach-Zehnder interference optical path and the time difference of optical path delay between the two arms Δτ n Adjust the value and return to execute step S3; if all values ​​have been adjusted... and Δτ n If the condition still cannot be met after taking the value, then step S5 is executed; S5, Judgment A i Is it greater than A min ,like A i > A min Then decrease A i If the condition is met, proceed to step S3; otherwise, proceed to step S6. S6, Judgment T k Is it less than T max ,like T k < T max Then increase T k and reset A i If the condition is met, proceed to step S3; otherwise, proceed to step S7. S7. The order of asymmetric Mach-Zehnder interference optical paths N Add one level, reset A i and T k Return to step S3.

9. The parameter configuration method for a space electromagnetic radiation device based on optical interferometry according to claim 8, characterized in that: The time delay difference between the two arms of the asymmetric Mach-Zehnder interferometer optical path Δτ n The measurement method is one of the following: oscilloscope time-domain electrical pulse interval measurement, vector network analyzer time-domain transformation and / or amplitude-phase analysis, optical time-domain reflection length measurement, and optical frequency-domain reflection length measurement.

10. The parameter configuration method for a space electromagnetic radiation device based on optical interferometry according to claim 8, characterized in that: The time delay difference between the two arms of the asymmetric Mach-Zehnder interferometer optical path Δτ n The adjustment method is to perform high-precision fiber optic cutting or fiber end face grinding.

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