Photon filtering device and photon filtering system

Abstract

The present invention discloses a photon filtering device and a photon filtering system. The photon filtering device includes an optical signal input module, an electrical signal input module, a modulation module, a polarization delay device, a polarizer, and a photoelectric conversion module. The optical signal input module receives an initial optical signal, and the electrical signal input module receives a control signal. The modulation module generates a coupled polarization signal based on the control signal and the initial optical signal, and the polarization delay device performs a center frequency adjustment operation on the coupled polarization signal. The polarizer performs a polarization operation on the coupled polarization signal and generates a target polarization signal, and the photoelectric conversion module generates a target electrical signal based on the target polarization signal. The photon filtering device of an embodiment of the present invention can modulate the input initial optical signal using a control signal, thereby improving the stability of the relative phase.

Description

Technical Field

[0001] The present invention relates to the field of optoelectronic communication technology, and in particular to a photon filtering device and a photon filtering system. Background Art

[0002] At present, photon filtering devices can use radio frequency signals to modulate optical carrier signals, and photon filtering devices have the advantages of high compactness, high compatibility in electromagnetic environments, and small size.

[0003] In related technologies, photon filtering devices process optical signals through two branches: the first branch performs single-sideband modulation on the optical signal, while the second branch delays the optical signal to adjust its central wavelength. However, the relative phase between the optical signals in the two branches of the photon filtering device can vary randomly, resulting in unstable relative phase of the signal output by the photon filtering device. Summary of the Invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a photon filter device that can improve the relative phase stability of the output signal of the photon filter device.

[0005] The present invention also provides a photon filtering system having the photon filtering device.

[0006] A photon filtering device according to an embodiment of the first aspect of the present invention includes:

[0007] An optical signal input module, configured to receive an initial optical signal;

[0008] An electrical signal input module, configured to receive a control signal;

[0009] a modulation module, the modulation module being configured to be communicatively connected to the optical signal input module and the electrical signal input module, respectively, and the modulation module being configured to generate a coupled polarization signal according to the control signal and the initial optical signal;

[0010] A polarization delay device, the polarization delay device is used to communicate with the modulation module, and the polarization delay device is used to perform a delay adjustment operation on the coupled polarization signal;

[0011] a polarizer, the polarizer being used to communicate with the polarization delay device, the polarizer being used to perform a polarization operation on the coupled polarization signal and generate a target polarization signal;

[0012] A photoelectric conversion module is configured to be communicatively connected to the polarizer, and is configured to generate a target electrical signal based on the target polarization signal.

[0013] The photon filter device according to an embodiment of the present invention has at least the following beneficial effects: the optical signal input module receives an initial optical signal, and the electrical signal input module receives a control signal. The modulation module generates a coupled polarization signal based on the control signal and the initial optical signal, and the polarization delay device performs a center frequency adjustment operation on the coupled polarization signal. The polarizer performs a polarization operation on the coupled polarization signal to generate a target polarization signal, and the optoelectronic conversion module generates a target electrical signal based on the target polarization signal. The photon filter device of this embodiment can modulate the input initial optical signal using the control signal, thereby improving relative phase stability.

[0014] According to some embodiments of the present invention, the optical signal input module includes:

[0015] an optical comb, the optical comb being used to receive the initial optical signal;

[0016] A filter is used to communicate with the optical comb and the modulation module respectively, and the filter is used to perform a frequency selection operation on the initial optical signal.

[0017] According to some embodiments of the present invention, the modulation module includes:

[0018] at least two modulation units, each of which is used to communicate with the filter and the electrical signal input module respectively, and each of which is used to perform a single-sideband modulation operation on the initial optical signal according to the control signal to generate an initial polarization signal;

[0019] A polarization control unit is configured to be coupled to all of the modulation units respectively, the polarization control unit is configured to be communicatively connected to the polarization delay device, and the polarization control unit is configured to generate the coupled polarization signal based on the two initial polarization signals.

[0020] According to some embodiments of the present invention, the initial optical signal includes an in-phase optical signal and an orthogonal optical signal, the control signal includes an in-phase control signal, an orthogonal control signal, and a phase difference control signal, and the modulation unit includes:

[0021] an in-phase modulator, the in-phase modulator being respectively connected to the filter, the electrical signal input module, and the polarization control unit, and being configured to generate an in-phase amplitude modulation signal according to the in-phase control signal and the in-phase optical signal;

[0022] an orthogonal modulator, the orthogonal modulator being configured to be communicatively connected to the filter and the electrical signal input module, respectively, and configured to generate a quadrature amplitude modulation signal according to the orthogonal control signal and the orthogonal optical signal;

[0023] a phase delayer, the phase delayer being respectively connected to the orthogonal modulator, the electrical signal input module, and the polarization control unit, and the phase delayer being used to perform a phase difference adjustment operation on the orthogonal amplitude modulation signal according to the phase difference control signal;

[0024] The in-phase amplitude modulation signal and the quadrature amplitude modulation signal constitute the initial polarization signal.

[0025] According to some embodiments of the present invention, the polarization retarder includes:

[0026] A beam splitter, the beam splitter being used to be communicatively connected to the polarization control units respectively, and the beam splitter being used to perform a signal separation or signal combination operation on the coupled polarization signal;

[0027] at least two phase difference adjusting members, the two phase difference adjusting members being respectively coupled to the beam splitter, and both being used to perform a phase difference adjustment operation on the coupled polarization signal;

[0028] A time delay adjusting component is used to be coupled to one of the beam splitters, and the time delay adjusting component is used to perform a time delay adjustment operation according to the coupled polarization signal.

[0029] According to some embodiments of the present invention, the photoelectric conversion module includes:

[0030] A photoelectric detector is used to communicate with the polarizer, and the photoelectric detector is used to perform a beat frequency operation on the target polarization signal.

[0031] According to some embodiments of the present invention, the photon filtering device further comprises:

[0032] An optical fiber is used to connect to the polarizer and the photodetector respectively.

[0033] According to some embodiments of the present invention, the electrical signal input module includes an antenna.

[0034] A photon filtering system according to an embodiment of the second aspect of the present invention includes:

[0035] The photon filtering device according to the embodiment of the first aspect of the present invention;

[0036] A light source module is configured to be coupled to the optical signal input module and to provide an initial optical signal.

[0037] The photon filtering system according to the embodiment of the present invention has at least the following beneficial effects: the photon filtering system can improve the stability of the relative phase by adopting the above-mentioned photon filtering device.

[0038] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:

[0040] Figure 1 A module block diagram of a specific embodiment of the photon filtering device of the present invention;

[0041] Figure 2 is a schematic diagram of a specific embodiment of a modulation module of the present invention;

[0042] Figure 3 is a schematic diagram of a specific embodiment of a modulation unit of the present invention;

[0043] Figure 4 FIG. 4 is a schematic diagram of a specific embodiment of the polarization delay device of the present invention.

[0044] Reference numerals:

[0045] Optical signal input module 100, electrical signal input module 200, modulation module 300, modulation unit 310, in-phase modulator 311, orthogonal modulator 312, phase delay 313, polarization control unit 320, polarization delay device 400, beam splitter 410, phase difference adjustment device 420, delay adjustment device 430, polarizer 500, photoelectric conversion module 600. DETAILED DESCRIPTION

[0046] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0047] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention.

[0048] In the description of the present invention, "several" means more than one, "plurality" means more than two, "greater than," "less than," and "exceed" are understood to exclude the number itself, while "above," "below," and "within" are understood to include the number itself. The use of "first" and "second" in the description is solely for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, implicitly specifying the number of the indicated technical features, or implicitly specifying the order of the indicated technical features.

[0049] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, and connecting should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0050] In the description of the present invention, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the exemplary expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0051] First, let’s analyze some of the terms used in this application:

[0052] Radio Remote Unit (RRU): Converts baseband optical signals into radio frequency signals at the remote end, amplifies them, and transmits them. This separates the baseband unit and radio frequency unit of the base station. Only baseband signals are transmitted between the two, thus preventing noise from being amplified.

[0053] Radiofrequency (RF): This refers to electromagnetic frequencies that can be radiated into space, ranging from 300kHz to 300GHz. RF, short for radiofrequency current, is a type of high-frequency alternating electromagnetic wave. Alternating current that changes less than 1,000 times per second is considered low-frequency current, while current that changes more than 10,000 times per second is considered high-frequency current, and RF is one such high-frequency current.

[0054] Building Baseband Unit (BBU): 3G networks utilize a distributed base station architecture. Optical fiber is required to connect the Remote Radio Unit (RRU) and the BBU. One BBU can support multiple RRUs.

[0055] Ordinary Wave (O light): When this light propagates in a crystal, no matter from which direction the light is incident, the refractive index remains constant and exhibits isotropic properties.

[0056] Extraordinary Wave (E light): Light that vibrates perpendicularly to O light. This type of light has a different refractive index when propagating in different directions because its vibration direction is perpendicular to that of O light.

[0057] Polarization Controller (PC): When polarized light propagates through a birefringent medium, the different propagation speeds of the O and E light cause one ray to experience a phase delay relative to the other, thus changing the polarization state of the light. Polarization controllers are developed based on this theory.

[0058] Center frequency: The center frequency is the frequency in the middle of the passband of the filter device. Taking the center frequency as the standard, the frequency higher than the center frequency until the frequency voltage is attenuated to 0.707 times is the upper sidefrequency, and the opposite is the lower sidefrequency. The frequency between the upper and lower sidefrequency is the passband.

[0059] In related technologies, photon filters can modulate optical carrier signals using radio frequency signals. These devices offer advantages such as high compactness, high compatibility in electromagnetic environments, and a small size. These devices process optical signals through two branches: the first branch performs single-sideband modulation on the optical signal, while the second branch delays the optical signal to adjust its central wavelength. However, the relative phase between the optical signals in the two branches of the photon filter can vary randomly, resulting in unstable relative phases of the output signals.

[0060] Based on this, an embodiment of the present invention provides a photon filtering device and a photon filtering system, which can improve the relative phase stability of the output signal of the photon filtering device.

[0061] like Figure 1As shown, an embodiment of the present invention provides a photon filtering device, comprising: an optical signal input module 100, an electrical signal input module 200, a modulation module 300, a polarization delay device 400, a polarizer 500, and a photoelectric conversion module 600. The optical signal input module 100 is used to receive an initial optical signal; the electrical signal input module 200 is used to receive a control signal; the modulation module 300 is used to communicate with the optical signal input module 100 and the electrical signal input module 200, respectively, and is used to generate a coupled polarization signal based on the control signal and the initial optical signal; the polarization delay device 400 is used to communicate with the modulation module 300, and is used to perform a time delay adjustment operation on the coupled polarization signal; the polarizer 500 is used to communicate with the polarization delay device 400, and is used to perform a polarization operation on the coupled polarization signal and generate a target polarization signal; the photoelectric conversion module 600 is used to communicate with the polarizer 500, and is used to generate a target electrical signal based on the target polarization signal.

[0062] Specifically, the initial optical signal is a high-energy or high-frequency carrier optical signal. High-energy or high-frequency carrier optical signals are less susceptible to external interference, and therefore have a long propagation distance. The control signal is an analog electrical signal, and its voltage can be adjusted as needed. The initial optical signal is received by the optical signal input module 100, and the control signal is received by the electrical signal input module 200.

[0063] The modulation module 300 is communicatively connected to the optical signal input module 100 and the electrical signal input module 200, respectively. The modulation module 300 receives the initial optical signal and the control signal, and performs single-sideband modulation on the initial optical signal using the control signal to obtain a coupled polarization signal. The coupled polarization signal can include optical signals in multiple polarization states, for example, optical signals in two polarization states are coupled into the coupled polarization signal. The modulation module 300 uses the control signal to modulate the input initial optical signal to obtain a coupled polarization signal comprising optical signals in multiple polarization states. Each of these multiple polarization state optical signals is independently modulated by the control signal, thereby improving relative phase stability.

[0064] The polarization delay device 400 is communicatively connected to the adjustment module. The polarization delay device 400 receives the coupled polarization signal and changes the center frequency of the coupled polarization signal by adjusting the delay of the coupled polarization signal. The polarizer is communicatively connected to the polarization delay device 400 and the photoelectric conversion module 600 respectively. After receiving the coupled polarization signal, the polarizer performs a polarization operation on the coupled polarization signal, adjusting the multiple polarization state optical signals in the coupled polarization signal to an optical signal of a uniform polarization state, thereby obtaining a target polarization signal. The photoelectric conversion module 600 receives the target polarization signal and converts the target polarization signal in the form of an optical signal into a target electrical signal in the form of an electrical signal. Finally, the photoelectric conversion module 600 outputs the target electrical signal to the subsequent circuit to realize the function of the subsequent circuit.

[0065] According to the photon filtering device of an embodiment of the present invention, the optical signal input module 100 receives an initial optical signal, and the electrical signal input module 200 receives a control signal. The modulation module 300 generates a coupled polarization signal based on the control signal and the initial optical signal, and the polarization delay device 400 performs a center frequency adjustment operation on the coupled polarization signal. The polarizer 500 performs a polarization operation on the coupled polarization signal and generates a target polarization signal, and the photoelectric conversion module 600 generates a target electrical signal based on the target polarization signal. The photon filtering device of this embodiment can modulate the input initial optical signal using the control signal, thereby improving the relative phase stability.

[0066] In some specific embodiments of the present invention, the optical signal input module 100 includes an optical comb and a filter. The optical comb is used to receive the initial optical signal; the filter is used to communicate with the optical comb and the modulation module 300, respectively, and is used to perform frequency selection on the initial optical signal.

[0067] Specifically, after receiving the initial optical signal, the optical comb locks the frequency of the initial optical signal to keep it within a certain range. A filter is connected to the optical comb and the adjustment module, respectively. The filter selects an initial optical signal of a specific frequency from the initial optical signals within the certain frequency range, allowing the modulation module 300 to receive the initial optical signal of the specific frequency.

[0068] like Figure 2 、 Figure 3As shown, in some specific embodiments of the present invention, the modulation module 300 includes: at least two modulation units 310 and a polarization control unit 320. Each modulation unit 310 is used to communicate with the filter and the electrical signal input module 200 respectively, and each modulation unit 310 is used to perform single-sideband modulation on the initial optical signal according to the control signal and generate an initial polarization signal; the polarization control unit 320 is used to couple with all the modulation units 310 respectively, and the polarization control unit 320 is used to communicate with the polarization delay 400, and the polarization control unit 320 is used to generate a coupled polarization signal based on the two initial polarization signals.

[0069] Specifically, each modulation unit 310 is respectively connected to the filter and the electrical signal input module 200 for communication. After receiving the control signal and the initial optical signal, each modulation unit 310 performs single-sideband modulation on the initial optical signal according to the control signal to generate an initial polarization signal. The polarization states of the initial polarization signals generated by each modulation unit 310 are different. The polarization control unit 320 is coupled to all the modulation units 310. After receiving the initial polarization signals of different polarization states, the polarization control unit 320 orthogonally couples the initial polarization signals of different polarization states to obtain a coupled polarization signal. For example, the modulation module 300 includes two modulation units 310, one of which modulates the initial optical signal into an initial polarization signal of an X polarization state, and the other modulation unit 310 modulates the initial optical signal into an initial polarization signal of a Y polarization state. The initial polarization signal of the X polarization state and the initial polarization signal of the Y polarization state are independent of and orthogonal to each other. The polarization control unit 320 then orthogonally couples the initial polarization signal in the X polarization state and the initial polarization signal in the Y polarization state to generate a coupled polarization signal, and outputs the coupled polarization signal to the polarization delay device 400. The polarization control unit 320 may include a polarization controller. In this embodiment, by providing at least two modulation units 310, single-sideband modulation is performed on the initial optical signal to generate two independent and orthogonal initial polarization signals, thereby improving the system capacity of the photon filtering device and increasing spectrum utilization.

[0070] like Figure 2 、 Figure 3As shown, in some specific embodiments of the present invention, the initial optical signal includes an in-phase optical signal and an orthogonal optical signal, the control signal includes an in-phase control signal, an orthogonal control signal, and a phase difference control signal, and the modulation unit 310 includes: an in-phase modulator 311, an orthogonal modulator 312, and a phase delay 313. The in-phase modulator 311 is used to communicate with the filter, the electrical signal input module 200, and the polarization control unit 320 respectively, and the in-phase modulator 311 is used to generate an in-phase amplitude modulation signal according to the in-phase control signal and the in-phase optical signal; the orthogonal modulator 312 is used to communicate with the filter and the electrical signal input module 200 respectively, and the orthogonal modulator 312 is used to generate an orthogonal amplitude modulation signal according to the orthogonal control signal and the orthogonal optical signal; the phase delayer 313 is used to communicate with the orthogonal modulator 312, the electrical signal input module 200, and the polarization control unit 320 respectively, and the phase delayer 313 is used to perform a phase difference adjustment operation on the orthogonal amplitude modulation signal according to the phase difference control signal; wherein, the in-phase amplitude modulation signal and the orthogonal amplitude modulation signal constitute the initial polarization signal.

[0071] Specifically, the in-phase optical signal is the in-phase component of the initial optical signal, and the quadrature optical signal is the quadrature component of the initial optical signal. The control signals received by the electrical signal input module 200 include an in-phase control signal BiasI, a quadrature control signal BiasQ, and a phase difference control signal BiasP.

[0072] Each modulation unit 310 includes an in-phase modulator 311, a quadrature modulator 312, and a phase delay 313. The in-phase modulator 311 is communicatively connected to the filter, the electrical signal input module 200, and the polarization control unit 320, respectively. The quadrature modulator 312 is communicatively connected to the filter and the electrical signal input module 200, respectively. The phase delay 313 is communicatively connected to the quadrature modulator 312, the electrical signal input module 200, and the polarization control unit 320, respectively. The in-phase modulator 311 receives an in-phase optical signal and adjusts its amplitude based on the voltage value of the in-phase control signal BiasI to produce an in-phase amplitude modulated signal. The quadrature modulator 312 receives a quadrature optical signal and adjusts its amplitude based on the voltage value of the quadrature control signal BiasQ to produce a quadrature amplitude modulated signal. The phase delay 313 receives a quadrature amplitude modulated signal and adjusts its phase difference based on the voltage value of the phase difference control signal BiasP. The in-phase and quadrature amplitude modulated signals obtained through the above operations now constitute the initial polarization signal, effectively completing single-sideband modulation of the initial optical signal. The voltages of the in-phase control signal BiasI, the quadrature control signal BiasQ, and the phase difference control signal BiasP can be adjusted as needed, thereby providing greater flexibility in the single-sideband modulation operation of modulation unit 310.

[0073] like Figure 2 、 Figure 4 As shown, in some specific embodiments of the present invention, the polarization delay device 400 includes: a beam splitter 410, a delay adjustment element 430, and at least two phase difference adjustment elements 420. The beam splitter 410 is used to communicate with the polarization control unit 320 respectively, and the beam splitter 410 is used to perform signal separation or signal combination operations on the coupled polarization signal; the two phase difference adjustment elements 420 are used to couple with the beam splitter 410 respectively, and both of the two phase difference adjustment elements 420 are used to perform phase difference adjustment operations on the coupled polarization signal; the delay adjustment element 430 is used to couple with one beam splitter 410, and the delay adjustment element 430 is used to adjust the delay according to the coupled polarization signal.

[0074] Specifically, after the beam splitter 410 receives the coupled polarization signal, it separates the optical signal A in the X polarization state and the optical signal B in the Y polarization state in the coupled polarization signal. The optical signal in the X polarization state passes through one of the phase difference adjustment components 420, and the optical signal in the Y polarization state passes through the other phase difference adjustment component 420. Among them, both phase difference adjustment components 420 can be selected as quarter wave plates. After the optical signal is vertically incident and passes through the quarter wave plate, the phase difference between the ordinary light and the extraordinary light of the outgoing optical signal is 1 / 4 wavelength. After the phase difference of one of the separated optical signals A passes through the phase difference adjustment component 420, it returns to the beam splitter 410 through mirror reflection. The other phase difference adjustment component 420 is coupled to the time delay adjustment component 430. After receiving the other separated optical signal B, the phase difference adjustment component 420 adjusts the inner cavity width (i.e. Figure 4 The width L in the delay adjustment member 430 is used to adjust the distance that the optical signal travels in the inner cavity of the delay adjustment member 430, thereby adjusting the transmission time of the optical signal, that is, realizing the delay adjustment of the optical signal. By adjusting the delay of the coupled polarization signal, the center frequency of the coupled polarization signal can be changed so that the center frequency of the coupled polarization signal meets the requirements. The optical signal B after delay adjustment is returned to the beam splitter 410. Finally, the beam splitter 410 combines the returned optical signal A and the optical signal B to form a coupled polarization signal that completes the delay adjustment, and outputs the coupled polarization signal to the polarizer 500. Among them, the relationship between the signal delay and the center frequency can be referred to the RF transfer function of the following formula (1):

[0075]

[0076] in, is the differential delay between the comb lines, and the center frequency offset is The free spectral range is is the group delay dispersion, Δω is the comb line spacing, P n is the power of the nth comb line, and τ is the time delay between the two branches.

[0077] In some specific embodiments of the present invention, the photoelectric conversion module 600 includes a photoelectric detector, which is used to communicate with the polarizer and perform a beat frequency operation on the target polarization signal.

[0078] Specifically, the photodetector receives the target polarization signal and beats it to the fundamental frequency, transferring the high-frequency and phase information in the target polarization signal to the difference frequency signal, making it easier to measure. Finally, the photodetector converts the target polarization signal into a target electrical signal and outputs it.

[0079] In some specific embodiments of the present invention, the photon filtering device further comprises an optical fiber, which is used to connect to the polarizer and the photodetector respectively.

[0080] Specifically, the optical fiber transmits the target polarization signal generated by the polarizer to the photodetector. During transmission, fiber dispersion introduces linear time differences between different frequencies, thereby distinguishing the information in the target polarization signal. The optical fiber length can range from 50m to 10km, and the specific length can be adjusted to meet specific needs.

[0081] In some specific embodiments of the present invention, the electrical signal input module 200 includes an antenna.

[0082] Specifically, the antenna receives the in-phase control signal BiasI, the orthogonal control signal BiasQ and the phase difference control signal BiasP in the above embodiment, so that the modulation unit completes the single sideband modulation of the initial optical signal according to BiasI, BiasQ and BiasP to obtain a coupled polarization signal.

[0083] In a specific embodiment of the present invention, the optical signal input module 100, electrical signal input module 200, modulation module 300, polarization delay device 400, and polarizer 500 in the above embodiment can form an RRU, and the optoelectronic conversion module 600 can form a BBU. The modulation module 300 can be a dual-polarization IQ modulator.

[0084] The embodiment of the present invention further provides a photon filtering system, comprising: a light source module and a photon filtering device as described in any of the above embodiments. The light source module is coupled to the optical signal input module and is used to provide an initial optical signal.

[0085] It can be seen that the contents of the above-mentioned photon filter device embodiment are all applicable to the embodiment of this photon filter system. The functions specifically implemented by this photon filter system embodiment are the same as those of the above-mentioned photon filter device embodiment, and the beneficial effects achieved are also the same as those achieved by the above-mentioned photon filter device embodiment.

[0086] While the embodiments of the present invention have been described in detail above with reference to the accompanying drawings, the present invention is not limited to the embodiments described above. Various modifications may be made within the scope of knowledge possessed by a person skilled in the art without departing from the spirit of the present invention. Furthermore, the embodiments of the present invention and the features thereof may be combined with one another unless there is a conflict.

Claims

1. A photon filtering device, characterized in that: include: An optical signal input module, configured to receive an initial optical signal; An electrical signal input module, configured to receive a control signal; A modulation module, wherein the modulation module is used to communicate with the optical signal input module and the electrical signal input module respectively, the initial optical signal includes an in-phase optical signal and an orthogonal optical signal, the control signal includes an in-phase control signal, an orthogonal control signal, and a phase difference control signal, the modulation module includes at least two modulation units and a polarization control unit, each of the modulation units is used to communicate with the optical signal input module and the electrical signal input module respectively, the modulation unit includes an in-phase modulator, an orthogonal modulator and a phase delayer, the in-phase modulator is used to communicate with the optical signal input module, the electrical signal input module and the polarization control unit respectively, the in-phase modulator is used to generate an in-phase amplitude modulation signal according to the in-phase control signal and the in-phase optical signal; the orthogonal modulator is used to communicate with the optical signal input module, the electrical signal input module and the polarization control unit respectively. The electrical signal input module is communicatively connected, and the orthogonal modulator is used to generate an orthogonal amplitude modulation signal according to the orthogonal control signal and the orthogonal optical signal; the phase delayer is used to communicate with the orthogonal modulator, the electrical signal input module, and the polarization control unit respectively, and the phase delayer is used to perform a phase difference adjustment operation on the orthogonal amplitude modulation signal according to the phase difference control signal; the polarization control unit is used to be coupled with all the modulation units respectively, and the polarization control unit is used to generate a coupled polarization signal according to the initial polarization signals output by at least two of the modulation units, and the initial polarization signal includes the in-phase amplitude modulation signal and the orthogonal amplitude modulation signal after the phase difference is adjusted, so that there is a fixed phase difference between the in-phase amplitude modulation signal and the orthogonal amplitude modulation signal in the initial polarization signal to maintain the stability of the relative phase between the signals; A polarization delay device, the polarization delay device is used to communicate with the polarization control unit in the modulation module, and the polarization delay device is used to perform a delay adjustment operation on the coupled polarization signal; a polarizer, the polarizer being used to communicate with the polarization delay device, the polarizer being used to perform a polarization operation on the coupled polarization signal and generate a target polarization signal; A photoelectric conversion module is configured to be communicatively connected to the polarizer, and is configured to generate a target electrical signal based on the target polarization signal.

2. The photon filter device according to claim 1, characterized in that The optical signal input module includes: an optical comb, the optical comb being used to receive the initial optical signal; A filter is used to communicate with the optical comb and the modulation module respectively, and the filter is used to perform a frequency selection operation on the initial optical signal.

3. The photon filter device according to claim 2, characterized in that: The polarization retarder comprises: A beam splitter, configured to perform signal separation or signal combination operations on the coupled polarization signals; at least two phase difference adjusting members, the two phase difference adjusting members being respectively coupled to the beam splitter, and both being used to perform a phase difference adjustment operation on the coupled polarization signal; A time delay adjusting component is used to be coupled to one of the beam splitters, and the time delay adjusting component is used to perform a time delay adjustment operation according to the coupled polarization signal.

4. The photon filter device according to any one of claims 1 to 3, characterized in that: The photoelectric conversion module includes: A photoelectric detector is used to communicate with the polarizer, and the photoelectric detector is used to perform a beat frequency operation on the target polarization signal.

5. The photon filter device according to claim 4, characterized in that: Also includes: An optical fiber is used to connect to the polarizer and the photodetector respectively.

6. The photon filter device according to claim 5, characterized in that: The electrical signal input module includes an antenna.

7. Photon filtering system, characterized in that, include: The photon filtering device according to any one of claims 1 to 6; A light source module is configured to be coupled to the optical signal input module and to provide an initial optical signal.

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