CN116996129A - Space electromagnetic radiation suppression device based on optical interference and parameter configuration method thereof - Google Patents

Space electromagnetic radiation suppression device based on optical interference and parameter configuration method thereof Download PDF

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CN116996129A
CN116996129A CN202310983157.XA CN202310983157A CN116996129A CN 116996129 A CN116996129 A CN 116996129A CN 202310983157 A CN202310983157 A CN 202310983157A CN 116996129 A CN116996129 A CN 116996129A
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optical
optical coupler
stage
electromagnetic radiation
arms
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张�浩
宋坤
王伯涛
何庆
何磊
刘禹圻
瞿鹏飞
陈林
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CETC 44 Research Institute
CETC 29 Research Institute
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CETC 29 Research Institute
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/50—Transmitters
    • H04B10/564—Power control
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/10—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type
    • G02B6/12—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type of the integrated circuit kind
    • G02B6/122—Basic optical elements, e.g. light-guiding paths
    • G02B6/125—Bends, branchings or intersections
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/24—Coupling light guides
    • G02B6/26—Optical coupling means
    • G02B6/28—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals
    • G02B6/2804—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals forming multipart couplers without wavelength selective elements, e.g. "T" couplers, star couplers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/50—Transmitters
    • H04B10/516—Details of coding or modulation
    • H04B10/54—Intensity modulation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/50—Transmitters
    • H04B10/516—Details of coding or modulation
    • H04B10/548—Phase or frequency modulation

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Electromagnetism (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Instruments For Measurement Of Length By Optical Means (AREA)

Abstract

The application relates to a space electromagnetic radiation suppression device based on optical interference and a parameter configuration method thereof, wherein the space electromagnetic radiation suppression device comprises N stages of asymmetric Mach-Zehnder interference light paths which are connected in a cascading mode, wherein N is an integer greater than or equal to 1; and the spectral ratio a of the N-stage asymmetric Mach-Zehnder interference optical path n And the two-arm optical path delay delta tau n The suppression amplitude requirement of each electromagnetic radiation leakage frequency and the power loss requirement of each system demand frequency are met. In the application, the asymmetric Mach-Zehnder connected in cascade through N stagesThe structure of the Deer interference light path increases the suppression amplitude of electromagnetic radiation leakage frequency, reduces the power loss of system demand frequency, fully exerts the optical anti-electromagnetic interference advantage, adopts mature technology, and has simple realization and high cost performance.

Description

Space electromagnetic radiation suppression device based on optical interference and parameter configuration method thereof
Technical Field
The application belongs to the technical field of microwave photons, and relates to a space electromagnetic radiation suppression device based on optical interference and a parameter configuration method thereof.
Background
The optical frequency comb is formed by a series of equally spaced frequency comb teeth in frequency spectrum, and becomes one of the most popular research directions in the optical field in the last ten years. Hitherto proposed from the concept of optical frequency combs, the methods of generation can be broadly divided into the following four categories according to the generation principle thereof: mode-locked laser method, cyclic frequency shifter method, fiber nonlinear effect method, and external modulator method. The optical frequency comb has the advantages of large bandwidth, high stability, rich frequency spectrum and the like, and has important application value in the fields of satellite navigation, aerospace, deep space exploration, reconnaissance and early warning and the like.
Electronic information equipment often has characteristics such as the system is complicated, integrated level is high, cross-linking interface type is many and quantity is big, and electromagnetic interference source type and emergence opportunity are various. In addition, because of the limitation of volume, weight and installation position, different kinds of electronic information equipment are often densely installed in a narrow and crowded space, and the requirement on electromagnetic compatibility of each electronic equipment is especially severe, once failure occurs, the performance is reduced when the electronic equipment is light, the function is lost when the electronic equipment is heavy, and even safety accidents can be caused. Because of the abundance of optical frequency comb spectrum, there are a large number of redundant spectral components for the user equipment, and the photoelectric conversion and its back-end processing circuits (modules) will form electromagnetic interference sources. Therefore, it is necessary to suppress electromagnetic radiation of unwanted frequency components of the optical frequency comb.
Disclosure of Invention
Aiming at the defects in the prior art, the application aims to solve the technical problems that: a space electromagnetic radiation suppression device based on optical interference and a parameter configuration method thereof are provided.
In order to achieve the above purpose, the present application provides the following technical solutions:
a space electromagnetic radiation suppression device based on optical interference comprises N stages of asymmetric Mach-Zehnder interference light paths which are connected in a cascading manner, wherein N is an integer greater than or equal to 1; for any electromagnetic radiation leakage frequency and system demand frequency, the spectral ratio of each stage of asymmetric Mach-Zehnder interference optical path and the delay difference of two arms of optical paths meet the following conditions:
wherein a is n The beam splitting ratio of the n-th-stage asymmetric Mach-Zehnder interference optical path is represented; Δτ n Representing the two-arm optical path delay difference of the n-th-stage asymmetric Mach-Zehnder interference optical path; f (f) i Representing a preset ith electromagnetic radiation leakage frequency; i is more than or equal to 1 and less than or equal to G, wherein G is the total number of electromagnetic radiation leakage frequencies; a is that i Represents f i The amplitude needs to be suppressed; a is that i ≥A min ，A min Representing a minimum suppression amplitude of the electromagnetic radiation leakage frequency; f (f) k Representing a preset kth system demand frequency; k is more than or equal to 1 and less than or equal to H, wherein H is the total number of system demand frequencies; t (T) k Represents f k Is a permissible power loss of (1); t (T) k ≤T max ，T max Representing the maximum power loss allowed by the system demand frequency.
Further, the N-stage asymmetric Mach-Zehnder interference optical path connected in a cascade mode comprises an optical coupler with an (n+1) stage adopting optical fiber cascade; 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 rest optical couplers are all 2×2 optical couplers; the 1 x 2 optocoupler has one input and two outputs, the 2 x 2 optocoupler has two inputs and two outputs, and the 2 x 1 optocoupler has two inputs and one output.
Further, the input end of the first-stage optical coupler is used as the input end of the space electromagnetic radiation suppression device and is used for being connected with an optical frequency comb;
the two input ends of the final-stage optical coupler are respectively connected with the two output ends of the front-stage optical coupler through optical fibers, and the output end of the final-stage optical coupler is used as the output end of the space electromagnetic radiation suppression device and is used for connecting with system equipment at the rear end;
when N is more than or equal to 2, the two input ends of each stage of 2X 2 optical coupler between the first stage and the last stage are respectively connected with the two output ends of the previous stage of optical coupler through optical fibers.
Further, the 1×2 optical coupler includes a first "Y" branch waveguide for branching and two first output arms connected to two output ends of the first "Y" branch waveguide, where an input end of the first "Y" branch waveguide is an input end of the 1×2 optical coupler, and non-connection ends of the two first output arms are two output ends of the 1×2 optical coupler;
the 2 x 2 optical coupler includes a second "Y" branch waveguide for combining and a third "Y" branch waveguide for splitting; two input ends of the second Y-shaped branch waveguide are respectively connected with a second input arm, and the output end of the second Y-shaped branch waveguide is connected with the input end of a third Y-shaped branch waveguide; the non-connection ends of the two second input arms are two input ends of a 2 x 2 optical coupler, and the non-connection ends of the two second output arms are two output ends of the 2 x 2 optical coupler;
the 2X 1 optical coupler comprises a fourth Y-branch waveguide for combining and two first input arms respectively connected with two input ends of the fourth Y-branch waveguide; the non-connection ends of the two first input arms are two input ends of the 2 x 1 optical coupler, and the output end of the fourth Y-branch waveguide is the output end of the 2 x 1 optical coupler.
Further, when n=1 and 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 the 1×2 optical coupler, the 2×1 optical coupler, and an optical fiber connecting between two first output arms of the 1×2 optical coupler and two first input arms of the 2×1 optical coupler.
Further, 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, a second "Y" branch waveguide and two second input arms in the 2×2 optical coupler cascaded therewith, and an optical fiber connecting between the two second input arms of the 2×2 optical coupler and the two first output arms of the 1×2 optical coupler;
when the first-stage optical coupler and the second-stage optical coupler are both 2×2 optical couplers, the first-stage asymmetric mach-zehnder interference optical path includes a third "Y" branch waveguide and two second output arms in the first-stage 2×2 optical coupler, a second "Y" branch waveguide and two second input arms in the second-stage 2×2 optical coupler, and an optical fiber between 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 final-stage optical coupler is a 2×1 optical coupler and the previous-stage optical coupler is a 2×2 optical coupler, the final-stage asymmetric mach-zehnder interference optical path comprises the 2×1 optical coupler, a third 'Y' branch waveguide and two second output arms in the 2×2 optical coupler cascaded with the 2×1 optical coupler, and optical fibers connected between the two first input arms of the 2×1 optical coupler and the two second output arms of the 2×2 optical coupler;
when the last-stage optical coupler and the preceding-stage optical coupler are both 2×2 optical couplers, the last-stage asymmetric mach-zehnder interference optical path includes a second "Y" branch waveguide and two second input arms in the last-stage 2×2 optical coupler, a third "Y" branch waveguide and two second output arms in the preceding-stage 2×2 optical coupler, and an optical fiber connecting between the two second input arms of the last-stage 2×2 optical coupler and the two second output arms of the preceding-stage 2×2 optical coupler.
Further, when N is more than or equal to 3, each asymmetric Mach-Zehnder interference optical path between the first stage and the last stage respectively comprises a third Y branch waveguide and two second output arms in the previous stage 2X 2 optical coupler, a second Y branch waveguide and two second input arms in the next stage 2X 2 optical coupler, and optical fibers between the two second input arms of the next stage 2X 2 optical coupler and the two second output arms of the previous stage 2X 2 optical coupler.
A method for configuring parameters of a spatial electromagnetic radiation device based on optical interference, for configuring parameters of a spatial electromagnetic radiation suppression device based on optical interference, comprising the steps of:
s1, setting the initial series of an asymmetric Mach-Zehnder interference light path to be 1; and determining the parameter boundaries of the asymmetric Mach-Zehnder interference optical paths as follows:
1≤N≤+∞；
0≤a n ≤1；
0≤Δτ n ≤1/f 0 ；
s2, setting the leakage frequency f of each electromagnetic radiation i And corresponding required suppression amplitude A i ；A i ≥A min The method comprises the steps of carrying out a first treatment on the surface of the Setting the required frequency f of each system k And corresponding allowable power loss T k ；T k ≤T max The method comprises the steps of carrying out a first treatment on the surface of the Setting the light splitting ratio a of each stage of asymmetric Mach-Zehnder interference light path n And the two-arm optical path delay delta tau n Is set to an initial value of (1);
s3, calculating the leakage frequency f of any electromagnetic radiation i And system demand frequency f k ，a n And Deltaτ n Whether or not the following conditions are satisfied:
ending the configuration if the above conditions are met; if there are one or more electromagnetic radiation leakage frequencies f i Or system demand frequency f k If the above condition is not satisfied, executing the step S4;
s4, the beam splitting ratio a of each stage of asymmetric Mach-Zehnder interference light path n And the two-arm optical path delay delta tau n The value of (2) is adjusted, and the step S3 is executed in a return manner; if all a are adjusted n And Deltaτ n After the value of (2) is still unable to meet the condition, executing S5;
s5, judging A i Whether or not it is greater than A min If A i ＞A min Then decrease A i Returning to execute the step S3; otherwise, executing the step S6;
s6, judging T k Whether or not it is smaller than T max If T k ＜T max Then increase T k Resetting A i Returning to execute the step S3; otherwise, executing the step S7;
s7, adding one level to the asymmetric Mach-Zehnder interference optical path series N, and resetting A i And T k And returning to the step S3.
Further, the two-arm optical path delay difference delta tau of the asymmetric Mach-Zehnder interference optical path n The measuring method is one of oscilloscope time domain electric pulse interval measurement, vector network analyzer time domain transformation or/and amplitude phase analysis, optical time domain reflection length measurement and optical frequency domain reflection length measurement.
Further, the two-arm optical path delay difference delta tau of the asymmetric Mach-Zehnder interference optical path n The adjusting method is to cut the optical fiber with high precision or grind the end face of the optical fiber.
In the application, the structure of the asymmetric Mach-Zehnder interference optical path connected in a cascade mode through N stages increases the suppression amplitude of electromagnetic radiation leakage frequency, and reduces the power loss of system demand frequency. By sequentially adjusting the splitting ratio and the two-arm optical path delay difference of the asymmetric Mach-Zehnder interference optical path, the required suppression amplitude of the electromagnetic radiation leakage frequency, the allowable power loss of the system required frequency and the series of the asymmetric Mach-Zehnder interference optical path, the spatial electromagnetic radiation suppression device structure with the minimum series, in which the suppression amplitude of the electromagnetic radiation leakage frequency and the allowable power loss of the system required frequency meet the requirements, can be obtained, and the suppression amplitude index and the power loss index of the spatial electromagnetic radiation suppression device can be obtained.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application and do not constitute a limitation on the application. In the drawings:
FIG. 1 is a block diagram illustrating an embodiment of a spatial electromagnetic radiation suppressing apparatus based on optical interference according to the present application.
Fig. 2 is a schematic diagram of a 1×2 optocoupler.
Fig. 3 is a schematic diagram of a 2×2 optocoupler.
Fig. 4 is a schematic structural diagram of a 2×1 optocoupler.
Fig. 5 is a schematic structural diagram of an asymmetric mach-zehnder interferometer optical path in which three stages are connected in cascade in embodiment 1.
Fig. 6 is a schematic structural diagram of an asymmetric mach-zehnder interferometer optical path in which two stages are connected in cascade in embodiment 2.
FIG. 7 is a flow chart of a method for configuring parameters of a spatial electromagnetic radiation suppressing apparatus based on optical interference according to an embodiment of the present application.
The meaning of the reference numerals in the drawings are:
1 x 2 optocoupler-101; a first "Y" branched waveguide-111; a first output arm-121;
2 x 2 optocouplers-201, 202, 203, 204, 205; a second "Y" branched waveguide-211; a third "Y" branch waveguide-212; a first input arm-221; a second output arm-222;
2 x 1 optocoupler-301; a fourth "Y" branch waveguide-311; a second input arm-321;
fiber-400; a first-stage asymmetric mach-zehnder interferometer optical path-910; a second stage asymmetric mach-zehnder interferometer optical path-920; third-stage asymmetric mach-zehnder interferometer optical path-930.
Detailed Description
The following description of the embodiments of the application is given by way of specific examples, the illustrations provided in the following examples merely illustrate the basic idea of the application, and the following examples and features of the examples can be combined with one another without conflict.
Example 1
Referring to fig. 1, fig. 1 is a block diagram illustrating an embodiment of a spatial electromagnetic radiation suppressing apparatus based on optical interference according to the present application. The spatial electromagnetic radiation suppression device based on optical interference comprises N stages of asymmetric Mach-Zehnder interference light paths which are connected in a cascading mode, wherein N is more than or equal to 1, and N is an integer. For any electromagnetic radiation leakage frequency and system demand frequency, the split ratio of each stage of asymmetric Mach-Zehnder interference optical path and the delay difference of two arms of optical paths meet the following conditions:
wherein a is n (n is an integer) represents the spectral ratio of the n-th asymmetric Mach-Zehnder interferometer path; Δτ n Representing the two-arm optical path delay difference of the n-th stage asymmetric Mach-Zehnder interference optical path. f (f) i Representing a preset ith electromagnetic radiation leakage frequency; and i is more than or equal to 1 and G is more than or equal to the total leakage frequency of electromagnetic radiation. A is that i Represents f i The amplitude needs to be suppressed; a is that i ≥A min ，A min Representing the minimum suppression amplitude of the electromagnetic radiation leakage frequency, the suppression amplitude value which must be achieved by the client/system requirement can be taken as A min 。f k (k is an integer) representsPreset kth system demand frequency; k is more than or equal to 1 and less than or equal to H, wherein H is the total number of system demand frequencies. T (T) k Represents f k Is a permissible power loss of (1); t (T) k ≤T max ，T max Indicating the maximum power loss allowed by the system demand frequency, the power loss value which is not allowed to be exceeded by the client/system demand can be taken as T max 。
In this embodiment, the N-stage asymmetric mach-zehnder interferometer includes a 1×2 optical coupler 101, a 2×1 optical coupler 301, and an (N-1-stage) 2×2 optical coupler cascade-connected between the 1×2 optical coupler 101 and the 2×1 optical coupler 301 via an optical fiber 400.
Referring to fig. 2, the 1×2 optical coupler 101 has one input end and two output ends, and the input end of the 1×2 optical coupler 101 is used as an input end of the spatial electromagnetic radiation suppressing device for connecting 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 connected to two output ends of the first "Y" branch waveguide 111, respectively, where an input end of the first "Y" branch waveguide 111 is an input end of the 1×2 optical coupler 101, and non-connection ends of the two first output arms 121 are two output ends of the 1×2 optical coupler 101.
Referring to fig. 3, the second stage 2×2 optical coupler has two input ends and two output ends, and the two input ends of each stage of the 2×2 optical coupler are connected to the two output ends of the previous stage of optical coupler through optical fibers 400, respectively. The 2 x 2 optical coupler includes a second "Y" branch waveguide 211 for combining and a third "Y" branch waveguide 212 for splitting. Two input ends of the second "Y" branch waveguide 211 are respectively connected with a first input arm 221, an output end of the second "Y" branch waveguide 211 is connected with an input end of the third "Y" branch waveguide 212, and two output ends of the third "Y" branch waveguide 212 are respectively connected with a second output arm 222. The non-connection ends of the two first input arms 221 are two input ends of a 2×2 optical coupler, and the non-connection ends of the two second output arms 222 are two output ends of the 2×2 optical coupler.
Referring to fig. 4, the 2×1 optical coupler 301 has two input ends and one output end, the two input ends of the 2×1 optical coupler 301 are respectively connected to the two output ends of the previous stage optical coupler through optical fibers 400, and the output end of the 2×1 optical coupler 301 is used as an output end of the spatial electromagnetic radiation suppression device for connecting to a system device. The 2 x 1 optical coupler 301 includes a fourth "Y" branch waveguide 311 for combining and two second input arms 321 connected to two input ends of the fourth "Y" branch waveguide 311, respectively. The non-connection ends of the two second input arms 321 are two input ends of the 2×1 optical coupler 301, and the output end of the fourth "Y" branch waveguide 311 is the output end of the 2×1 optical coupler 301.
The structure of the spatial electromagnetic radiation suppressing apparatus of the present embodiment will be described below taking n=3 as an example. Referring to fig. 5, the three-stage asymmetric mach-zehnder interferometer optical path includes a 1 x 2 optical coupler 101, two 2 x 2 optical couplers (201, 202), and a 2 x 1 optical coupler 301. Wherein the first-stage asymmetric mach-zehnder interferometer optical path 910 comprises a 1 x 2 optical coupler 101, a second "Y" branching waveguide 211 and two first input arms 221 in the 2 x 2 optical coupler 201, and an optical fiber 400 connecting between the two first input arms 221 in the 2 x 2 optical coupler 201 and the two first output arms 121 of the 1 x 2 optical coupler 101.
The second stage asymmetric mach-zehnder interferometer optical path 920 comprises a third "Y" branch waveguide 212 in the 2 x 2 optical coupler 201 and two second output arms 222, a second "Y" branch waveguide 211 in the 2 x 2 optical coupler 202 and two first input arms 221, and an optical fiber 400 connecting between the two first input arms 221 of the 2 x 2 optical coupler 202 and the two second output arms 222 of the 2 x 2 optical coupler 201.
The third stage asymmetric mach-zehnder interferometer optical path 930 comprises a 2 x 1 optical coupler 301, a third "Y" branching waveguide 212 and two second output arms 222 in the 2 x 2 optical coupler 202, and an optical fiber 400 connecting between the two second input arms 321 of the 2 x 1 optical coupler 301 and the two second output arms 222 of the 2 x 2 optical coupler 202.
As can be readily appreciated from the above examples, each 2×2 optical coupler added between the 1×2 optical coupler 101 and the 2×1 optical coupler 301, a first-order asymmetric mach-zehnder interference optical path is correspondingly added. Similarly, each 2×2 optical coupler is reduced, the first-order asymmetric mach-zehnder interference optical path is correspondingly reduced. When n=1, the asymmetric mach-zehnder interference optical path includes only one 1×2 optical coupler 101 and one 2×1 optical coupler 301, and an optical fiber 400 connecting between 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.
In this embodiment, the structure of the asymmetric mach-zehnder interference optical path connected in cascade through the N stages increases the suppression amplitude to the electromagnetic radiation leakage frequency (i.e., the unnecessary frequency), and reduces the power loss of the system demand frequency (i.e., the system required frequency), so that the above structure fully plays the optical anti-electromagnetic interference advantage, and the adopted structures are all mature technologies, and are simple to implement and high in cost performance.
Example 2
In the embodiment, an optical coupler with (n+1) stages connected in a cascading manner is adopted to form an asymmetric Mach-Zehnder interference optical path with N stages connected in a cascading manner; and each of the optical couplers is a 2×2 optical coupler, and the structure of the 2×2 optical coupler is the same as that of example 1. Two input ends of the first-stage 2 x 2 optical coupler are used as input ends of the space electromagnetic radiation suppression device and are respectively connected with an optical frequency comb; two output ends of the final stage 2 x 2 optical coupler are used as output ends of the space electromagnetic radiation suppression device and are used for connecting system equipment; the two input ends of each of the 2 x 2 optical couplers between the first stage and the last stage are connected to the two output ends of the previous stage optical coupler through optical fibers 400, respectively.
The structure of the spatial electromagnetic radiation suppressing apparatus of the present embodiment will be described below taking n=2 as an example. Referring to fig. 6, the two-stage asymmetric mach-zehnder interferometer optical path includes three 2 x 2 optical couplers (203, 204, 205). Wherein the first-stage asymmetric mach-zehnder interferometer optical path 910 comprises a third "Y" branch waveguide 212 and two second output arms 222 in the 2 x 2 optical coupler 203, a second "Y" branch waveguide 211 and two second input arms 221 in the 2 x 2 optical coupler 204, and two optical fibers 400 connecting between the two second input arms 221 of the 2 x 2 optical coupler 204 and the two second output arms 222 of the 2 x 2 optical coupler 203. The non-connection ends of the two second input arms 221 of the 2×2 optical coupler 203 serve as two input ends of the spatial electromagnetic radiation suppressing apparatus, respectively, for connecting one optical frequency comb.
The second stage asymmetric mach-zehnder interferometer optical path 920 comprises a third "Y" branch waveguide 212 in the 2 x 2 optical coupler 204 and two second output arms 222, a second "Y" branch waveguide 211 in the 2 x 2 optical coupler 205 and two second input arms 221, and two optical fibers 400 connecting between the two second input arms 221 of the 2 x 2 optical coupler 205 and the two second output arms 222 of the 2 x 2 optical coupler 204. The non-connection ends of the two second output arms 222 of the 2×2 optical coupler 205 serve as two output ends of the spatial electromagnetic radiation suppressing apparatus, respectively, for connecting to one system device.
As can be readily appreciated from the above example, each 2 x 2 optical coupler added after the 2 x 2 optical coupler 203, a corresponding one-stage asymmetric mach-zehnder interference optical path is added. Similarly, each 2×2 optical coupler is reduced, the first-order asymmetric mach-zehnder interference optical path is correspondingly reduced.
With the structure of this embodiment, since the spatial electromagnetic radiation suppressing apparatus has two input terminals and two output terminals, the two optical frequency combs connected can be used as a main one by one through time division multiplexing, and output signals can be provided to two system devices at the same time.
On the basis of embodiment 1 and embodiment 2, it is easy to understand that the first-stage optocoupler may be set as a 2×2 optocoupler and the last-stage optocoupler as a 2×1 optocoupler 301; or the first-stage optocoupler is set as a 1×2 optocoupler 101 and the last-stage optocoupler is set as a 2×2 optocoupler.
Example 3
Referring to fig. 7, fig. 7 is a flowchart illustrating an embodiment of a parameter configuration method of a spatial electromagnetic radiation suppressing apparatus based on optical interference according to the present application. The parameter configuration method of the spatial electromagnetic radiation device based on optical interference of the embodiment is used for configuring parameters of the spatial electromagnetic radiation suppression device based on optical interference, so that a spatial electromagnetic radiation suppression device structure with minimum series of levels, in which the suppression amplitude of electromagnetic radiation leakage frequency and the allowable power loss of system demand frequency meet requirements, is obtained, and a suppression amplitude index and a power loss index of the spatial electromagnetic radiation suppression device are obtained. The parameter configuration method of the spatial electromagnetic radiation device based on optical interference of the embodiment comprises the following steps:
s1, an initial order of the asymmetric mach-zehnder interference optical path is set, and generally, the initial order of the asymmetric mach-zehnder interference optical path is set to n=1. And determining the parameter boundaries of the asymmetric Mach-Zehnder interference optical paths as follows:
1≤N≤+∞；
0≤a n ≤1；
0≤Δτ n ≤1/f 0 ；
s2, setting the leakage frequency f of each electromagnetic radiation i And corresponding required suppression amplitude A i And setting the required frequency f of each system k And corresponding allowable power loss T k 。A i The value of (2) is required to satisfy A i ≥A min ；T k The value of (2) needs to satisfy T k ≤T max . Therefore, under the condition of meeting the minimum suppression amplitude of the electromagnetic radiation leakage frequency and the maximum allowable power loss of the system demand frequency, the suppression amplitude value of the electromagnetic radiation leakage frequency and the power loss value of the system demand frequency, which are close to the actual performance of the space electromagnetic radiation suppression device, can be found.
Setting the light splitting ratio a of each-stage asymmetric Mach-Zehnder interference light path n And the two-arm optical path delay delta tau n Is set to be a constant value. For example, parameters of each stage of asymmetric mach-zehnder interference optical paths may be set to be: a, a i ＝0；Δτ i ＝0。
S3, calculating the leakage frequency f of any electromagnetic radiation i And system demand frequency f k ，a n And Deltaτ n Whether or not the following conditions are satisfied:
if for any electromagnetic radiation leakage frequency f i And any system demand frequency f k ，a n And Deltaτ n The values of (a) satisfy the above conditions, a is described n And Deltaτ n The configuration can be ended when the values of the (a) meet the requirements, so that the a of each stage of asymmetric Mach-Zehnder interference optical paths n And Deltaτ n Takes the value of (A) as the parameter of each stage of asymmetric Mach-Zehnder interference optical path i I.e. the value of the suppression amplitude parameter of the electromagnetic radiation leakage frequency of the space electromagnetic radiation suppression device, T at the moment k I.e. the value of the power loss parameter which can be the system demand frequency of the spatial electromagnetic radiation suppression device. If a is n And Deltaτ n For one or more electromagnetic radiation leakage frequencies f i Or system demand frequency f k If the above condition is not satisfied, then a is described n And Deltaτ n The value of (2) is not satisfactory, and the step S4 is executed for adjustment.
S4, the beam splitting ratio a of each stage of asymmetric Mach-Zehnder interference light path n And the two-arm optical path delay delta tau n And the value of (2) is adjusted. If adjusted a n And Deltaτ n For any electromagnetic radiation leakage frequency f i And any system demand frequency f k Ending the configuration when the conditions are satisfied, and carrying out a on each stage of asymmetric Mach-Zehnder interference light paths at the moment n And Deltaτ n Is used as the parameter of each stage of asymmetric Mach-Zehnder interference light path; a at this time is i As the value of the suppression amplitude parameter of the electromagnetic radiation leakage frequency of the spatial electromagnetic radiation suppression device, T at this time is taken as k As a value of a power loss parameter of a system demand frequency of the spatial electromagnetic radiation suppressing apparatus. Otherwise continue to pair a n And Deltaτ n Is adjusted until a n And Deltaτ n For any electromagnetic radiation leakage frequency f i And any system demand frequency f k The condition is satisfied. If all a are adjusted n And Deltaτ n After the value of (2) is taken, the conditions still cannot be fully met, and the current T cannot be reached k And A i S5 is executed, firstly, for T k And (5) adjusting.
S5, judging A i Whether or not it is greater than A min If A i ＞A min Then decrease A i And returning to the step S3, and continuing to judge and adjust. If A i ＝A min Description of adjustment A i Failure to make a n And Deltaτ n The value of (2) reaches the requirement, and S6 is performed on T k And (5) adjusting.
S6, judging T k Whether or not it is smaller than T max If T k ＜T max Then increase T k Resetting A i And returning to the step S3, and continuing to judge and adjust. If T k ＝T max The number of stages, a, of the existing asymmetric Mach-Zehnder interferometer paths is described n And Deltaτ n And the value of (2) cannot meet the requirement, and the step S7 is executed to increase the number of stages of the asymmetric Mach-Zehnder interference optical path.
S7, increasing the number of stages of the asymmetric Mach-Zehnder interference optical path by one stage, namely N=N+1; reset A i And T k And returning to the step S3, and continuing to judge and adjust. Therefore, the number of stages can be increased when the number of stages of the existing asymmetric Mach-Zehnder interference optical path does not meet the requirement, and the requirement of suppressing amplitude of electromagnetic radiation leakage frequency and the requirement of allowing power loss of system demand frequency can be met by the simplest structure.
After obtaining parameters of each stage of asymmetric Mach-Zehnder interference optical path, the asymmetric Mach-Zehnder interference optical path can be manufactured according to the values of the parameters, and in the manufacturing process, the light splitting ratio a of each stage of asymmetric Mach-Zehnder interference optical path is measured n And the two-arm optical path delay delta tau n The method can be one of oscilloscope time domain electric pulse interval measurement, vector network analyzer time domain analysis and amplitude phase analysis, optical time domain reflection length measurement and optical frequency domain reflection length measurement. Delay delta tau of two-arm optical path of the asymmetric Mach-Zehnder interference optical path n The adjustment method is to cut the optical fiber 400 with high precision or grind the end face of the optical fiber 400.
In this embodiment, parameter setting is performed for the structure of the N-stage asymmetric mach-zehnder interference optical path connected in a cascade manner, and by sequentially adjusting the splitting ratio of the asymmetric mach-zehnder interference optical path, the delay difference of the two-arm optical path, the required suppression amplitude of the electromagnetic radiation leakage frequency, the allowable power loss of the system demand frequency and the number of stages of the asymmetric mach-zehnder interference optical path, the spatial electromagnetic radiation suppression device structure with the minimum number of stages, in which the suppression amplitude of the electromagnetic radiation leakage frequency and the allowable power loss of the system demand frequency meet the requirements, can be obtained, and the suppression amplitude index and the power loss index of the spatial electromagnetic radiation suppression device are obtained.
Finally, it is noted that the above embodiments are only for illustrating the technical solution of the present application and not for limiting the same, and although the present application has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications and equivalents may be made thereto without departing from the spirit and scope of the present application, which is intended to be covered by the claims of the present application.

Claims (10)

1. A spatial electromagnetic radiation suppression device based on optical interference, characterized in that: the optical system comprises N stages of asymmetric Mach-Zehnder interference optical paths which are connected in a cascading manner, wherein N is an integer greater than or equal to 1; for any electromagnetic radiation leakage frequency and system demand frequency, the spectral ratio of each stage of asymmetric Mach-Zehnder interference optical path and the delay difference of two arms of optical paths meet the following conditions:
wherein a is n The beam splitting ratio of the n-th-stage asymmetric Mach-Zehnder interference optical path is represented; Δτ n Representing the two-arm optical path delay difference of the n-th-stage asymmetric Mach-Zehnder interference optical path; f (f) i Indicating the preset firsti electromagnetic radiation leakage frequencies; i is more than or equal to 1 and less than or equal to G, wherein G is the total number of electromagnetic radiation leakage frequencies; a is that i Represents f i The amplitude needs to be suppressed; a is that i ≥A min ，A min Representing a minimum suppression amplitude of the electromagnetic radiation leakage frequency; f (f) k Representing a preset kth system demand frequency; k is more than or equal to 1 and less than or equal to H, wherein H is the total number of system demand frequencies; t (T) k Represents f k Is a permissible power loss of (1); t (T) k ≤T max ，T max Representing the maximum power loss allowed by the system demand frequency.
2. The spatial electromagnetic radiation suppression device based on optical interference of claim 1, wherein: the N-stage asymmetric Mach-Zehnder interference optical path connected in a cascading manner comprises an optical coupler with an (N+1) stage adopting optical fiber cascading; 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 rest optical couplers are all 2×2 optical couplers; the 1 x 2 optocoupler has one input and two outputs, the 2 x 2 optocoupler has two inputs and two outputs, and the 2 x 1 optocoupler has two inputs and one output.
3. The spatial electromagnetic radiation suppression device based on optical interference of claim 2, wherein: the input end of the first-stage optical coupler is used as the input end of the space electromagnetic radiation suppression device and is connected with an optical frequency comb;
the two input ends of the final-stage optical coupler are respectively connected with the two output ends of the front-stage optical coupler through optical fibers, and the output end of the final-stage optical coupler is used as the output end of the space electromagnetic radiation suppression device and is used for connecting with system equipment at the rear end;
when N is more than or equal to 2, the two input ends of each stage of 2X 2 optical coupler between the first stage and the last stage are respectively connected with the two output ends of the previous stage of optical coupler through optical fibers.
4. A spatial electromagnetic radiation suppression device based on optical interferometry according to claim 3, wherein: the 1X 2 optical coupler comprises a first Y-shaped branch waveguide for branching and two first output arms respectively connected with two output ends of the first Y-shaped branch waveguide, wherein the input end of the first Y-shaped branch waveguide is a 1X 2 optical coupler input end, and the non-connection ends of the two first output arms are two output ends of the 1X 2 optical coupler;
the 2 x 2 optical coupler includes a second "Y" branch waveguide for combining and a third "Y" branch waveguide for splitting; two input ends of the second Y-shaped branch waveguide are respectively connected with a second input arm, and the output end of the second Y-shaped branch waveguide is connected with the input end of a third Y-shaped branch waveguide; the non-connection ends of the two second input arms are two input ends of a 2 x 2 optical coupler, and the non-connection ends of the two second output arms are two output ends of the 2 x 2 optical coupler;
the 2X 1 optical coupler comprises a fourth Y-branch waveguide for combining and two first input arms respectively connected with two input ends of the fourth Y-branch waveguide; the non-connection ends of the two first input arms are two input ends of the 2 x 1 optical coupler, and the output end of the fourth Y-branch waveguide is the output end of the 2 x 1 optical coupler.
5. The spatial electromagnetic radiation suppression device based on optical interference of claim 4, wherein: when n=1 and 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 the 1×2 optical coupler, the 2×1 optical coupler, and an optical fiber connecting between two first output arms of the 1×2 optical coupler and two first input arms of the 2×1 optical coupler.
6. The spatial electromagnetic radiation suppression device based on optical interference of claim 4, wherein: 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 comprises the 1×2 optical coupler, a second 'Y' branch waveguide and two second input arms in the 2×2 optical coupler cascaded with the first-stage optical coupler, and an optical fiber connecting the two second input arms of the 2×2 optical coupler and the two first output arms of the 1×2 optical coupler;
when the first-stage optical coupler and the second-stage optical coupler are both 2×2 optical couplers, the first-stage asymmetric mach-zehnder interference optical path includes a third "Y" branch waveguide and two second output arms in the first-stage 2×2 optical coupler, a second "Y" branch waveguide and two second input arms in the second-stage 2×2 optical coupler, and an optical fiber between 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 final-stage optical coupler is a 2×1 optical coupler and the previous-stage optical coupler is a 2×2 optical coupler, the final-stage asymmetric mach-zehnder interference optical path comprises the 2×1 optical coupler, a third 'Y' branch waveguide and two second output arms in the 2×2 optical coupler cascaded with the 2×1 optical coupler, and optical fibers connected between the two first input arms of the 2×1 optical coupler and the two second output arms of the 2×2 optical coupler;
when the last-stage optical coupler and the preceding-stage optical coupler are both 2×2 optical couplers, the last-stage asymmetric mach-zehnder interference optical path includes a second "Y" branch waveguide and two second input arms in the last-stage 2×2 optical coupler, a third "Y" branch waveguide and two second output arms in the preceding-stage 2×2 optical coupler, and an optical fiber connecting between the two second input arms of the last-stage 2×2 optical coupler and the two second output arms of the preceding-stage 2×2 optical coupler.
7. The spatial electromagnetic radiation suppression device based on optical interference of claim 6, wherein: when N is more than or equal to 3, each asymmetric Mach-Zehnder interference optical path between the first stage and the last stage respectively comprises a third Y branch waveguide and two second output arms in the previous stage 2X 2 optical coupler, a second Y branch waveguide and two second input arms in the next stage 2X 2 optical coupler, and optical fibers connected between the two second input arms of the next stage 2X 2 optical coupler and the two second output arms of the previous stage 2X 2 optical coupler.
8. A method for configuring parameters of an optical interference-based spatial electromagnetic radiation device, characterized by comprising the steps of:
s1, setting the initial series of an asymmetric Mach-Zehnder interference light path to be 1; and determining the parameter boundaries of the asymmetric Mach-Zehnder interference optical paths as follows:
1≤N≤+∞；
0≤a n ≤1；
0≤Δτ n ≤1/f 0 ；
s2, setting the leakage frequency f of each electromagnetic radiation i And corresponding required suppression amplitude A i ；A i ≥A min The method comprises the steps of carrying out a first treatment on the surface of the Setting the required frequency f of each system k And corresponding allowable power loss T k ；T k ≤T max The method comprises the steps of carrying out a first treatment on the surface of the Setting the light splitting ratio a of each stage of asymmetric Mach-Zehnder interference light path n And the two-arm optical path delay delta tau n Is set to an initial value of (1);
s3, calculating the leakage frequency f of any electromagnetic radiation i And system demand frequency f k ，a n And Deltaτ n Whether or not the following conditions are satisfied:
ending the configuration if the above conditions are met; if there are one or more electromagnetic radiation leakage frequencies f i Or system demand frequency f k If the above condition is not satisfied, executing the step S4;
s4, the beam splitting ratio a of each stage of asymmetric Mach-Zehnder interference light path n And the two-arm optical path delay delta tau n The value of (2) is adjusted, and the step S3 is executed in a return manner; if all a are adjusted n And Deltaτ n After the value of (2) is still unable to meet the condition, executing S5;
s5, judging A i Whether or not it is greater than A min If A i ＞A min Then decrease A i Returning to execute the step S3; otherwise, executing the step S6;
s6, judging T k Whether or not it is smaller than T max If T k ＜T max Then increase T k Resetting A i Returning to execute the step S3; otherwise, executing the step S7;
s7, adding one level to the asymmetric Mach-Zehnder interference optical path series N, and resetting A i And T k And returning to the step S3.
9. The method for configuring parameters of an optical interference-based spatial electromagnetic radiation apparatus according to claim 8, wherein: the two-arm optical path delay difference delta tau of the asymmetric Mach-Zehnder interference optical path n The measuring method is one of oscilloscope time domain electric pulse interval measurement, vector network analyzer time domain transformation or/and amplitude phase analysis, optical time domain reflection length measurement and optical frequency domain reflection length measurement.
10. The method for configuring parameters of an optical interference-based spatial electromagnetic radiation apparatus according to claim 8, wherein: the two-arm optical path delay difference delta tau of the asymmetric Mach-Zehnder interference optical path n The adjusting method is to cut the optical fiber with high precision or grind the end face of the optical fiber.
CN202310983157.XA 2023-08-04 2023-08-04 Space electromagnetic radiation suppression device based on optical interference and parameter configuration method thereof Pending CN116996129A (en)

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