Interference signal detection device, system and method

Abstract

The invention relates to the field of optical detection, and discloses an interference signal detection device, system and method. The device comprises a coupling module, a polarization adjusting module, an interference module and a detector. According to the device, a coupling module couples a received original optical signal to a polarization adjustment module; the polarization adjustment module adjusts the original optical signal and sends the adjusted original optical signal to the interference module; the interference module reflects the received original optical signal to obtain an interference signal, and returns the interference signal to the coupling module through the polarization adjustment module; when receiving the interference signals, the coupling module couples the interference signals and outputs the coupled interference signals to the detector; and finally, the detector detects the coupled interference signal. Due to the fact that the device is simple in structural connection, compared with an existing measuring mode, the adjusting process of a focusing lens and a calibration lens is omitted, and stable detection of interference signals is achieved under the condition that excessive limitation is not needed.

Description

Technical Field

[0001] The present invention relates to the technical field of optical detection, and particularly relates to an interference signal detection device, system and method. Background Art

[0002] An interference signal is generated by the superposition of two or more light waves. By detecting the interference signal, information related to the interference of light waves can be obtained, thereby meeting different measurement requirements. For example, the principle of the Michelson interferometer designed based on the optical interference effect is the basic principle of many current optical depth and length distance detections. It splits the same beam of light and reflects it through corresponding plane mirrors, and interference occurs under the conditions that the optical path difference is within the coherence length range and other interference conditions.

[0003] Currently, the detection of interference signals can be divided into two types. One is the spatial light beam convergence method, which allows the measurement light to freely propagate in space and then converge on a photoelectric sensor (APD) for signal acquisition; the other is the fiber optic transmission method, which requires a combination of relatively expensive components such as a fiber optic circulator and polarization-maintaining fiber. Therefore, in practical applications, based on the above two methods for detecting interference signals, professional instruments need to be arranged, and there is a problem of complex installation and adjustment processes.

[0004] The above content is only used to assist in understanding the technical solution of the present invention, and does not represent an admission that the above content is related art. Summary of the Invention

[0005] The main purpose of the present invention is to provide an interference signal detection device, system and method, aiming to solve the technical problem that the existing methods for detecting interference signals require the arrangement of professional instruments and have a complex installation and adjustment process in actual use.

[0006] To achieve the above purpose, the present invention provides an interference signal detection device, which includes: a coupling module, a polarization adjustment module, an interference module, and a detector;

[0007] Among them, the coupling module is respectively connected to the polarization adjustment module and the detector, and the polarization adjustment module is connected to the interference module;

[0008] The coupling module is used to couple the received original optical signal to the polarization adjustment module;

[0009] The polarization adjustment module is used to adjust the original optical signal and send the adjusted original optical signal to the interference module;

[0010] The interference module is used to reflect the received original optical signal, obtain an interference signal, and return the interference signal to the coupling module through the polarization adjustment module;

[0011] The coupling module is further configured to, when receiving the interference signal, couple the interference signal and output the coupled interference signal to the detector;

[0012] The detector is configured to detect the coupled interference signal.

[0013] Optionally, the coupling module includes a first fiber optic coupler and a second fiber optic coupler. The first fiber optic coupler is respectively connected to the second fiber optic coupler and the detector, and the second fiber optic coupler is respectively connected to the detector and the polarization adjustment module;

[0014] The first fiber optic coupler is configured to couple the original optical signal sent by the signal source through the optical fiber and send the original optical signal to the second fiber optic coupler and the detector;

[0015] The second fiber optic coupler is configured to, when receiving the original optical signal, send the original optical signal to the polarization adjustment module;

[0016] The second fiber optic coupler is further configured to couple the interference signal returned by the interference module based on the polarization adjustment module and send the interference signal to the detector;

[0017] The detector is further configured to detect the original optical signal and the coupled interference signal.

[0018] Optionally, the polarization adjustment module includes: a first polarization controller and a second polarization controller, and the interference module includes: a reference arm and a measurement arm;

[0019] Wherein, the first polarization controller is respectively connected to the reference arm and the second fiber optic coupler, and the second polarization controller is respectively connected to the measurement arm and the second fiber optic coupler;

[0020] The first polarization controller is configured to perform a first polarization adjustment on the original optical signal to obtain a first optical signal and send the first optical signal to the reference arm;

[0021] The reference arm is configured to reflect the first optical signal to obtain a first interference optical signal and send the first interference optical signal to the second fiber optic coupler;

[0022] The second polarization controller is configured to perform a second polarization adjustment on the original optical signal to obtain a second optical signal and send the second optical signal to the measurement arm;

[0023] The measurement arm is used to reflect the second optical signal to obtain a second interference optical signal and send the second interference optical signal to the second fiber optic coupler;

[0024] The second fiber optic coupler is used to couple the first interference optical signal and the second interference optical signal to obtain the interference signal and send the coupled interference signal to the detector.

[0025] Optionally, the detector is further configured to receive a background signal input by the signal source and perform noise reduction processing on the interference signal according to the background signal;

[0026] The detector is further configured to convert the noise-reduced interference signal to obtain an electrical signal and send the electrical signal to the data processing device.

[0027] In addition, to achieve the above object, the present invention also provides an interference signal detection system, which includes: a data processing device and the interference signal detection device described above;

[0028] Wherein, the data processing device is connected to the detector in the interference signal detection device;

[0029] The detector is configured to convert the interference signal to obtain an electrical signal when receiving the interference signal and send the electrical signal to the data processing device;

[0030] The data processing device is configured to analyze the electrical signal when receiving the electrical signal, obtain an optical waveform image of the interference signal corresponding to the electrical signal, and display the optical waveform image.

[0031] In addition, to achieve the above object, the present invention also provides an interference signal detection method based on the interference signal detection device described above, and the method includes the following steps:

[0032] Obtain the original optical signal sent by the signal source through the optical fiber;

[0033] Perform polarization adjustment on the original optical signal to obtain an adjusted original optical signal;

[0034] Reflect the adjusted original optical signal to obtain an interference signal;

[0035] Couple the interference signal to obtain the coupled interference signal;

[0036] Detect the coupled interference signal.

[0037] Optionally, the performing polarization adjustment on the original optical signal to obtain an adjusted original optical signal includes:

[0038] Perform a first polarization adjustment on the original optical signal to obtain a first optical signal;

[0039] Perform a second polarization adjustment on the original optical signal to obtain a second optical signal;

[0040] Correspondingly, reflecting the adjusted original optical signal to obtain an interference signal includes:

[0041] Reflect the first optical signal to obtain a first interference optical signal;

[0042] Reflect the second optical signal to obtain a second interference optical signal.

[0043] Optionally, coupling the interference signal to obtain the coupled interference signal includes:

[0044] When receiving the first interference optical signal and the second interference optical signal, couple the first interference optical signal and the second interference optical signal to obtain the coupled interference signal.

[0045] Optionally, detecting the coupled interference signal includes:

[0046] Detect the original optical signal and the coupled interference signal;

[0047] Convert the detection result to obtain an electrical signal;

[0048] Send the electrical signal to a data processing device so that the data processing device obtains and displays an optical waveform image corresponding to the electrical signal according to the electrical signal.

[0049] Optionally, before converting the detection result to obtain an electrical signal, it further includes:

[0050] Receive a background signal input by the signal source, and perform denoising processing on the detection result according to the background signal;

[0051] Correspondingly, converting the detection result to obtain an electrical signal includes:

[0052] Convert the denoised test result to obtain an electrical signal.

[0053] In the present invention, the interference signal detection device includes: a coupling module, a polarization adjustment module, an interference module, and a detector. First, the received original optical signal is coupled to the polarization adjustment module through the coupling module; then the polarization adjustment module adjusts the original optical signal and sends the adjusted original optical signal to the interference module; then the interference module reflects the received original optical signal to obtain an interference signal, and returns the interference signal to the coupling module through the polarization adjustment module; further, when the coupling module receives the interference signal, it couples the interference signal and outputs the coupled interference signal to the detector; finally, the detector detects the coupled interference signal. Since the coupling module in the device is respectively connected to the polarization adjustment module and the detector, and the polarization adjustment module is connected to the interference module, the structural connection is convenient and simple. Compared with the existing measurement method of interference signals, the adjustment process of focusing and calibration lenses is eliminated, and the stable detection of interference signals is achieved under the condition of without too many restrictions. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] Figure 1 is the structural block diagram of the first embodiment of the interference signal detection device of the present invention;

[0055] Figure 2 is the structural block diagram of the second embodiment of the interference signal detection device of the present invention;

[0056] Figure 3 is the structural block diagram of the third embodiment of the interference signal detection device of the present invention;

[0057] Figure 4 is the structural block diagram of the first embodiment of the interference signal detection system of the present invention;

[0058] Figure 5 is the schematic diagram of the detected waveform in the first embodiment of the interference signal detection system of the present invention;

[0059] Figure 6 is the flow schematic diagram of the first embodiment of the interference signal detection method of the present invention.

[0060] The realization, functional features, and advantages of the object of the present invention will be further described with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0061] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0062] Reference Figure 1 , Figure 1It is a structural block diagram of the first embodiment of the interference signal detection device of the present invention. The device includes: a coupling module 10, a polarization adjustment module 20, an interference module 30, and a detector 40. Among them, the coupling module 10 is respectively connected to the polarization adjustment module 20 and the detector 40, and the polarization adjustment module 20 is connected to the interference module 30;

[0063] The coupling module 10 is used to couple the received original optical signal to the polarization adjustment module 20.

[0064] It should be noted that the original optical signal can be a stable optical signal emitted by a fixed single light source (signal source 00). This optical signal can be transmitted in an optical fiber and then sent to the polarization adjustment module 20 through the coupling module 10.

[0065] It should be understood that the coupling module 10 can adopt an optical fiber coupler for optical fiber coupling. This optical fiber coupler can connect different optical fibers, realize the connection between different optical fibers, enable the optical signal to be transmitted from one optical fiber to another optical fiber, and realize the transmission of the optical signal.

[0066] The polarization adjustment module 20 is used to adjust the original optical signal and send the adjusted original optical signal to the interference module 30.

[0067] It should be understood that the polarization adjustment module 20 can rotate and adjust the polarization direction of the original optical signal, and can also control the polarization intensity of the original optical signal to match different experimental requirements and measurement purposes, so as to achieve accurate measurement. The polarization adjustment module 20 can specifically select a polarization controller.

[0068] The interference module 30 is used to reflect the received original optical signal to obtain an interference signal, and send the interference signal back to the coupling module 10 through the polarization adjustment module 20.

[0069] It should be understood that the interference module 30 can be designed based on the principle of a Michelson interferometer. The interference module can include a retroreflective device for optical reflection, such as a half mirror or a mirror, etc., for reflecting the received original optical signal to obtain an interference signal. And send the interference signal back to the coupling module 10 through the polarization adjustment module 20.

[0070] The coupling module 10 is further used to couple the interference signal when receiving the interference signal, and output the coupled interference signal to the detector.

[0071] It should be noted that after receiving the interference signal obtained by reflection, the coupling module 10 can couple the original optical signal to obtain an interference signal that can be used for subsequent measurement and analysis, and send the interference signal to the detector 40.

[0072] The detector 40 is used to detect the coupled interference signal.

[0073] It should be understood that the detector 40 can play the role of detecting and measuring the interference signal, such as interference fringes, interference light intensity, etc. The detector can also amplify the interference signal with a weak amplitude, which is beneficial to detecting low-intensity interference signals and improving the reliability of measurement.

[0074] In a specific implementation, after receiving the above interference signal, the detector 40 can detect information including interference fringes, interference light intensity, etc., which can provide information about the sample to be measured or the environmental characteristics.

[0075] Furthermore, the detector 40 can output the information and measurement data of the above interference signal. By analyzing and processing this data, relevant parameters for research, measurement, or control processes can be obtained.

[0076] In this embodiment, first, the received original optical signal is coupled to the polarization adjustment module through the coupling module; then the polarization adjustment module adjusts the original optical signal and sends the adjusted original optical signal to the interference module; then the interference module reflects the received original optical signal to obtain an interference signal, and returns the interference signal to the coupling module through the polarization adjustment module; further, when the coupling module receives the interference signal, it couples the interference signal and outputs the coupled interference signal to the detector; finally, the detector detects the coupled interference signal. Since the coupling module in the device is respectively connected to the polarization adjustment module and the detector, and the polarization adjustment module is connected to the interference module, the structural connection is convenient and simple. Compared with the existing measurement method of interference signals, the adjustment process of focusing and calibration lenses is omitted, and the stable detection of interference signals is achieved under the condition of not too many restrictions.

[0077] Reference Figure 2 , Figure 2 is the structural block diagram of the second embodiment of the interference signal detection device of the present invention.

[0078] Based on the above embodiment, the second embodiment of the interference signal detection device of the present invention is proposed.

[0079] In this embodiment, the coupling module 10 includes a first fiber optic coupler 101 and a second fiber optic coupler 102. The first fiber optic coupler 101 is respectively connected to the second fiber optic coupler 102 and the detector 40, and the second fiber optic coupler 102 is respectively connected to the detector 40 and the polarization adjustment module 20.

[0080] The first fiber optic coupler 101 is configured to couple the original optical signal transmitted by the signal source 00 through the optical fiber, and send the original optical signal to the second fiber optic coupler 102 and the detector 40.

[0081] It should be understood that the first fiber optic coupler and the second fiber optic coupler can adopt fiber optic couplers with the same coupler structure to realize the splitting and coupling of the original optical signal. The fiber optic coupler can be a common four-wire coupler with two inputs and two outputs, which can reduce the device construction cost.

[0082] It should also be noted that the optical fiber can be a non-polarization-maintaining optical fiber. Compared with the relatively expensive polarization-maintaining optical fiber, since there is a polarization adjustment module for adjusting the optical polarization in this device, using a non-polarization-maintaining optical fiber for optical signal transmission can further reduce the device construction cost while improving the transmission quality compared with the direct transmission method of spatial light.

[0083] In a specific implementation, the first fiber optic coupler 101 can receive the original optical signal transmitted by the signal source 00 based on the non-polarization-maintaining optical fiber, and send the original optical signal to the second fiber optic coupler 102 and the detector 40 respectively.

[0084] The second fiber optic coupler 102 is configured to send the original optical signal to the polarization adjustment module 20 when receiving the original optical signal.

[0085] The second fiber optic coupler 102 is further configured to couple the interference signal returned by the interference module 30 based on the polarization adjustment module 20, and send the interference signal to the detector 40.

[0086] It should be understood that when the second fiber optic coupler 102 receives the original optical signal, it transmits the original optical signal to the polarization adjustment module 20 for optical polarization adjustment, so that after the interference module 30 receives the adjusted original optical signal, it reflects the signal, that is, an interference signal is obtained at the second fiber optic coupler 102, and the interference signal is sent to the detector 40 for subsequent detection of the interference signal.

[0087] The detector 40 is further configured to detect the original optical signal and the coupled interference signal.

[0088] It should be understood that when the coupled interference signal is obtained, in order to analyze the interference signal, the original optical signal can be further combined to obtain the final interference signal, thereby realizing the measurement and analysis of the interference signal and obtaining the information required for the experimental requirements and measurement purposes.

[0089] Furthermore, the detector 40 can also be used to convert the optical signal into an electrical signal, and by transmitting the electrical signal to a data processing and analysis device outside the device, a visual analysis result of the interference signal can be obtained.

[0090] In this embodiment, the first optical fiber coupler and the second optical fiber coupler with the same coupler structure are adopted, which can realize the splitting and coupling of the original optical signal. Since the optical fiber coupler can be a common four-wire coupler with double input and double output, the device construction cost can be reduced; and because there is a polarization adjustment module for optical polarization adjustment in this device, non-polarization-maintaining optical fibers can be used for the transmission of optical signals. Compared with the direct transmission method of spatial light, the transmission quality can be improved while further reducing the device construction cost.

[0091] Reference Figure 3 , Figure 3 is the structural block diagram of the third embodiment of the interference signal detection device of the present invention.

[0092] Based on the above embodiments, the third embodiment of the interference signal detection device of the present invention is proposed.

[0093] In this embodiment, the polarization adjustment module 20 includes: a first polarization controller 201 and a second polarization controller 202, and the interference module 30 includes: a reference arm 301 and a measurement arm 302;

[0094] Among them, the first polarization controller 201 is respectively connected to the reference arm 301 and the second optical fiber coupler 102, and the second polarization controller 202 is respectively connected to the measurement arm 302 and the second optical fiber coupler 102;

[0095] The first polarization controller 201 is used to perform a first polarization adjustment on the original optical signal to obtain a first optical signal and send the first optical signal to the reference arm 301.

[0096] It should be understood that the first polarization controller 201 and the second polarization controller 202 can adopt polarization controllers with the same structure to perform polarization adjustment on the input original optical signal.

[0097] It should also be noted that the second optical fiber coupler 102 can split the original optical signal after obtaining the original optical signal, split the original optical signal into two identical original optical signals, upper and lower, and input them into the first polarization controller 201 and the second polarization controller 202 respectively.

[0098] In a specific implementation, the first polarization controller 201 can perform personalized polarization adjustment on the original optical signal transmitted after splitting by the second optical fiber coupler 102 based on the current experimental requirements or measurement purposes, obtain a first optical signal, and transmit the first optical signal to the reference arm 301.

[0099] The reference arm 301 is configured to reflect the first optical signal to obtain a first interference optical signal, and send the first interference optical signal to the second optical fiber coupler 102.

[0100] It should be understood that a retroreflector device for reflection, such as a half mirror or a reflector, can be connected in the reference arm 301. The first optical signal passes through this retroreflector device to achieve optical reflection and obtain a first interference optical signal.

[0101] The second polarization controller 202 is configured to perform a second polarization adjustment on the original optical signal to obtain a second optical signal, and send the second optical signal to the measurement arm 302.

[0102] It should also be noted that this second polarization adjustment can adopt the same or different adjustment methods as the above first polarization adjustment. The specific adjustment method can be set personalized based on the current experimental requirements or measurement purposes, and this embodiment does not limit this.

[0103] In a specific implementation, the second polarization controller 202 can perform personalized polarization adjustment on the original optical signal transmitted after splitting by the second optical fiber coupler 102 based on the current experimental requirements or measurement purposes, obtain a second optical signal, and transmit the second optical signal to the measurement arm 302.

[0104] The measurement arm 302 is configured to reflect the second optical signal to obtain a second interference optical signal, and send the second interference optical signal to the second optical fiber coupler.

[0105] It should be understood that a retroreflector device for reflection, such as a half mirror or a reflector, can be connected in the measurement arm 302. The second optical signal passes through this retroreflector device to achieve optical reflection and obtain a second interference optical signal.

[0106] The second optical fiber coupler 102 is configured to couple the first interference optical signal and the second interference optical signal to obtain the interference signal, and send the coupled interference signal to the detector 40.

[0107] In a specific implementation, when the second optical fiber coupler 102 receives the first interference optical signal and the second interference optical signal that are respectively reflected back by the reference arm 301 and the measurement arm 302 after the original optical signal is split and polarization-adjusted, it couples them to obtain a coupled interference signal, and sends the coupled interference signal to the detector 40 for subsequent processing and analysis.

[0108] Further, in order to reduce the interference of background noise on the interference signal, the detector 40 is further configured to receive the background signal input by the signal source 00, and perform denoising processing on the interference signal according to the background signal.

[0109] It should be understood that the background signal of the current device environment can be obtained in advance according to the measurement environment where the signal source 00 is located, and then the background noise can be eliminated by using the method of cancellation denoising and combining the interference signal.

[0110] The detector 40 is further configured to convert the denoised interference signal to obtain an electrical signal, and send the electrical signal to the data processing device.

[0111] It should be understood that in order to further analyze the interference signal after obtaining it, the output of the detector can be connected to an external data processing device for visual display such as waveform capture and restoration.

[0112] In a specific implementation, when the detector 40 obtains the denoised interference signal, it can perform optoelectronic conversion on the interference signal to obtain an electrical signal that can be input to an external data processing device, and then the waveform of the interference signal can be captured and restored by the external data processing device.

[0113] In this embodiment, the original optical signal emitted by the signal source is propagated through an optical fiber, passes through an optical fiber coupler, and is then adjusted by a polarization controller. It is respectively reflected by the measurement arm and the reference arm to obtain the first interference optical signal and the second interference optical signal. After being coupled, it is input to the detector. At the same time, the detector can access the background signal to denoise the coupled interference signal. When the detector obtains the denoised interference signal, it can perform optoelectronic conversion on the interference signal to obtain an electrical signal that can be input to an external data processing device, and then the waveform of the interference signal can be captured and restored by the external data processing device. Since the connection of each structure of the device in this embodiment is convenient and simple, the construction cost is low, which is beneficial to production and debugging, and can eliminate background noise, an interference signal with a high signal-to-noise ratio can be obtained.

[0114] Reference Figure 4 , Figure 4 is the structural block diagram of the first embodiment of the interference signal detection system of the present invention.

[0115] Based on the above embodiments, the present invention further provides an interference signal detection system, which includes: a data processing device A1 and the interference signal detection device B1 described above.

[0116] Among them, the data processing device A1 is connected to the detector 40 in the interference signal detection device B1.

[0117] The detector 40 is configured to convert the interference signal into an electrical signal when receiving the interference signal, and send the electrical signal to the data processing device A1.

[0118] It should be understood that since the interference signal is an optical signal, when it is necessary to input the interference signal into the data processing device, the interference signal can be subjected to optoelectronic conversion to obtain the electrical signal corresponding to the interference signal.

[0119] The data processing device A1 is configured to analyze the electrical signal when receiving the electrical signal, obtain the optical waveform image of the interference signal corresponding to the electrical signal, and display the optical waveform image.

[0120] It should be noted that the data processing device A1 can be a computing electronic device with data processing, network communication, program running, and image display functions, such as a personal computer, an interference signal analyzer, etc.

[0121] In a specific implementation, when the data processing device A1 receives the electrical signal transmitted by the detector 40, it can analyze and restore the electrical signal to obtain relevant information of the interference signal corresponding to the electrical signal, such as the optical waveform image of the interference signal, and display the optical waveform image to obtain a detection waveform.

[0122] Reference can be made here Figure 5 , Figure 5 For the schematic diagram of the detection waveform, taking the detected object as a transparent sphere as an example, in Figure 5 , the total vertical axis is the signal amplitude, the horizontal axis is the data position, and the two amplitudes respectively represent the reflection signals of the front and back surfaces of the detected object.

[0123] In this embodiment, the interference signal detection system includes a data processing device and the interference signal detection device described above. The data processing device is connected to the detector in the interference signal detection device. When the detector receives the interference signal, it converts the interference signal to obtain an electrical signal and sends the electrical signal to the data processing device. When the data processing device receives the electrical signal, it analyzes the electrical signal, obtains the optical waveform image of the interference signal corresponding to the electrical signal, and displays the optical waveform image. It can obtain a visual detection result of the interference signal according to the experimental requirements and test purposes, and realizes the capture and restoration of the waveform.

[0124] The embodiment of the present invention also provides an interference signal detection method, refer to Figure 6 , Figure 6 which is a schematic flowchart of the first embodiment of the interference signal detection method of the present invention. In this embodiment, the interference signal detection method includes the following steps:

[0125] Step S10: Obtain the original optical signal sent by the signal source through the optical fiber.

[0126] It should be noted that the method of this embodiment can be applied to the scenario of signal detection of a low-power Michelson interferometer device, or to the scenario of capturing and detecting various optical interference signals. The execution subject of this embodiment can be the interference signal detection device described above.

[0127] It should be noted that the original optical signal can be a stable optical signal emitted by a fixed single light source. This optical signal can be transmitted in the optical fiber and sent to the interference signal detection device of the present invention.

[0128] Step S20: Perform polarization adjustment on the original optical signal to obtain the adjusted original optical signal.

[0129] It should be understood that the interference signal detection device can rotate and adjust the polarization direction of the original optical signal, and can also control the polarization intensity of the original optical signal to match different experimental requirements and measurement purposes, and achieve precise measurement.

[0130] In a specific implementation, the interference signal detection device can perform a first polarization adjustment on the original optical signal to obtain a first optical signal; perform a second polarization adjustment on the original optical signal to obtain a second optical signal.

[0131] Step S30: Reflect the adjusted original optical signal to obtain an interference signal.

[0132] It should be understood that the interference signal detection device can include a retroreflective device for optical reflection, such as a half mirror or a mirror, etc., for reflecting the received original optical signal to obtain an interference signal.

[0133] In a specific implementation, the interference signal detection device can perform a first polarization adjustment on the original optical signal to obtain a first optical signal; and perform a second polarization adjustment on the original optical signal to obtain a second optical signal.

[0134] Step S40: Couple the interference signal to obtain the coupled interference signal.

[0135] In a specific implementation, when the interference signal detection device receives the first interference optical signal and the second interference optical signal, it couples the first interference optical signal and the second interference optical signal to obtain the coupled interference signal.

[0136] Step S50: Detect the coupled interference signal.

[0137] In a specific implementation, the interference signal detection device can detect the original optical signal and the coupled interference signal; convert the detection result to obtain an electrical signal; and send the electrical signal to the data processing device so that the data processing device can obtain and display an optical waveform image corresponding to the electrical signal according to the electrical signal. Among them, the data processing device can be a computing electronic device with data processing, network communication, program running, and image display functions, such as a personal computer, an interference signal analyzer, etc.

[0138] Further, in order to obtain an interference signal with a relatively high signal-to-noise ratio, before the step of converting the detection result to obtain an electrical signal, it is also possible to receive a background signal input by the signal source, perform noise reduction processing on the detection result according to the background signal, and then convert the noise-reduced test result to obtain an electrical signal.

[0139] This embodiment obtains the original optical signal sent by the signal source through an optical fiber; performs polarization adjustment on the original optical signal to obtain the adjusted original optical signal; reflects the adjusted original optical signal to obtain an interference signal; couples the interference signal to obtain the coupled interference signal; and detects the coupled interference signal. It can use an interference signal detection device with a simple connection structure to stably detect the interference signal.

[0140] For other embodiments or specific implementation manners of the interference signal detection method of the present invention, reference can be made to the above embodiments, and details are not described herein again.

[0141] It should be noted that in this text, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, such that a process, method, article or system comprising a series of elements not only includes those elements but also includes other elements not expressly listed, or elements inherent to such process, method, article or system. Without further limitation, an element defined by the statement "comprising one..." does not exclude the existence of additional identical elements in the process, method, article or system comprising such element.

[0142] The serial numbers of the above embodiments of the present invention are only for description and do not represent the superiority or inferiority of the embodiments.

[0143] Through the description of the above embodiments, those skilled in the art can clearly understand that the above embodiment methods can be implemented by means of software plus a necessary general hardware platform. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation. Based on such an understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art can be embodied in the form of a software product. This computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disc) and includes several instructions for causing a terminal device (which can be a mobile phone, computer, server, or network device, etc.) to execute the methods described in the various embodiments of the present invention.

[0144] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structure or equivalent process transformation made by using the description of the present invention and the accompanying drawings, or directly or indirectly applied in other related technical fields, shall be equally included in the patent protection scope of the present invention.

Claims

1. An interference signal detection device, characterized in that, The device includes: a coupling module, a polarization adjustment module, an interference module, and a detector; Among them, the coupling module is respectively connected to the polarization adjustment module and the detector, and the polarization adjustment module is connected to the interference module; The coupling module is used to couple the received original optical signal to the polarization adjustment module; The polarization adjustment module is used to adjust the original optical signal and send the adjusted original optical signal to the interference module; The interference module is used to reflect the received original optical signal to obtain an interference signal, and send the interference signal back to the coupling module through the polarization adjustment module; The coupling module is further used to couple the interference signal when receiving the interference signal, and output the coupled interference signal to the detector; The detector is used to detect the coupled interference signal.

2. The interference signal detection device according to claim 1, wherein The coupling module includes a first fiber optic coupler and a second fiber optic coupler. The first fiber optic coupler is respectively connected to the second fiber optic coupler and the detector, and the second fiber optic coupler is respectively connected to the detector and the polarization adjustment module; The first fiber optic coupler is used to couple the original optical signal sent by the signal source through the optical fiber, and send the original optical signal to the second fiber optic coupler and the detector; The second fiber optic coupler is used to send the original optical signal to the polarization adjustment module when receiving the original optical signal; The second fiber optic coupler is further used to couple the interference signal returned by the interference module based on the polarization adjustment module, and send the interference signal to the detector; The detector is further used to detect the original optical signal and the coupled interference signal.

3. The interference signal detection device according to claim 2, characterized in that, The polarization adjustment module includes: a first polarization controller and a second polarization controller, and the interference module includes: a reference arm and a measurement arm; Among them, the first polarization controller is respectively connected to the reference arm and the second fiber optic coupler, and the second polarization controller is respectively connected to the measurement arm and the second fiber optic coupler; The first polarization controller is used to perform a first polarization adjustment on the original optical signal to obtain a first optical signal, and send the first optical signal to the reference arm; The reference arm is used to reflect the first optical signal to obtain a first interference optical signal, and send the first interference optical signal to the second fiber optic coupler; The second polarization controller is used to perform a second polarization adjustment on the original optical signal to obtain a second optical signal, and send the second optical signal to the measurement arm; The measurement arm is used to reflect the second optical signal to obtain a second interference optical signal, and send the second interference optical signal to the second fiber optic coupler; The second fiber optic coupler is used to couple the first interference optical signal and the second interference optical signal to obtain the interference signal, and send the coupled interference signal to the detector.

4. The interference signal detection device according to claim 3, characterized in that The detector is further configured to receive a background signal input by the signal source, and perform noise reduction processing on the interference signal according to the background signal; The detector is further configured to convert the denoised interference signal to obtain an electrical signal, and send the electrical signal to the data processing device.

5. An interference signal detection system, characterized in that, The system includes: a data processing device and the interference signal detection device according to any one of claims 1 to 4; Wherein, the data processing device is connected to a detector in the interference signal detection device; The detector is configured to, when receiving an interference signal, convert the interference signal to obtain an electrical signal, and send the electrical signal to the data processing device; The data processing device is configured to, when receiving the electrical signal, analyze the electrical signal, obtain an optical waveform image of the interference signal corresponding to the electrical signal, and display the optical waveform image.

6. An interference signal detection method based on the interference signal detection device according to any one of claims 1 to 4, characterized in that, The method includes: Obtaining an original optical signal transmitted by a signal source through an optical fiber; Performing polarization adjustment on the original optical signal to obtain an adjusted original optical signal; Reflecting the adjusted original optical signal to obtain an interference signal; Coupling the interference signal to obtain the coupled interference signal; Detecting the coupled interference signal.

7. The interference signal detection method according to claim 6, characterized in that The performing polarization adjustment on the original optical signal to obtain an adjusted original optical signal includes: Performing first polarization adjustment on the original optical signal to obtain a first optical signal; Performing second polarization adjustment on the original optical signal to obtain a second optical signal; Correspondingly, the reflecting the adjusted original optical signal to obtain an interference signal includes: Reflecting the first optical signal to obtain a first interference optical signal; Reflecting the second optical signal to obtain a second interference optical signal.

8. The interference signal detection method according to claim 7, wherein The coupling the interference signal to obtain the coupled interference signal includes: When receiving the first interference optical signal and the second interference optical signal, coupling the first interference optical signal and the second interference optical signal to obtain the coupled interference signal.

9. The interference signal detection method according to claim 8, wherein, The detecting the coupled interference signal includes: Detecting the original optical signal and the coupled interference signal; Converting the detection result to obtain an electrical signal; Sending the electrical signal to the data processing device so that the data processing device obtains and displays an optical waveform image corresponding to the electrical signal according to the electrical signal.

10. The interference signal detection method according to claim 9, wherein Before the converting the detection result to obtain an electrical signal, it further includes: Receiving a background signal input by the signal source, and performing noise reduction processing on the detection result according to the background signal; Correspondingly, the converting the detection result to obtain an electrical signal includes: Converting the denoised test result to obtain an electrical signal.

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