Microwave photon space-frequency cooperative processing device and method for all-optical signal transmission

Abstract

The invention discloses a microwave photon space-frequency cooperative processing device and method for all-optical signal transmission. The device comprises a light source unit, a space-domain optical beam forming processing unit and a frequency-domain optical channelization processing unit. The light source unit comprises a laser module and a first optical power division module; the spatial domain optical beam forming processing unit comprises a second optical power division module, a carrier suppression single side band electro-optical modulation module, an optical delay network module and a first optical combination module; the frequency domain optical channelization processing unit comprises a second optical combination module, an optical comb local oscillator module, a parallel optical filtering and channel separation module and a plurality of photoelectric detection modules. According to the device, a microwave interface is prevented from being used between optical beam forming processing and optical channelization processing, integration is facilitated, meanwhile, loss of signals in the photoelectric conversion process and the electro-optical conversion process is avoided, and the bandwidth limitation problem of the microwave interface is effectively solved.

Description

Technical Field

[0001] The present invention relates to the field of microwave photon technology, and in particular to a microwave photon space-frequency coordinated processing device and method for all-optical signal transmission. Background Art

[0002] Microwave photonic technology has been increasingly used in electronic information systems due to its advantages such as large bandwidth, high parallelism, and fast response. Currently, a variety of processing technologies have been or will be applied to actual systems. Generally, related processing technologies can be classified according to signal processing domains. For example, spatial domain processing typically uses optical beamforming technology, and frequency domain processing typically uses optical channelization technology.

[0003] However, when different microwave photon processing technologies are integrated and applied in the system, microwave interfaces are usually used for signal transmission between different microwave photon processing units. The advantage of this is that microwave interfaces are used as isolation between microwave photon processing units, which not only makes the design of each microwave photon processing unit less affected by the upstream and downstream links, but also avoids problems such as conflicts in optical device parameter settings.

[0004] However, the above method has a serious drawback. The microwave photon processing unit uses optical signals to complete the processing process. If the microwave interface is used for signal transmission, then an electro-optical conversion and an optoelectronic conversion must be added between every two microwave photon processing units. At present, the signal conversion efficiency of electro-optical conversion and optoelectronic conversion is not high, which will lead to a serious increase in signal insertion loss (without considering amplifier compensation, the current signal loss of one electro-optical conversion plus optoelectronic conversion is more than 25dB, which is equivalent to the signal power after conversion being only 0.3% of the initial power). Even if the power loss can be compensated by the amplifier, it will inevitably lead to a series of problems such as increased system noise coefficient, dynamic range compression, increased power consumption and cost. In addition, the bandwidth of microwave devices usually has a certain octave limit. Using a microwave interface as a signal transmission will offset the advantages of microwave photon processing units in ultra-large bandwidth. Summary of the invention

[0005] To solve the above problems, the present invention provides a microwave photonic space-frequency collaborative processing device and method for all-optical signal transmission, which realizes the use of optical interface to transmit signals between two processing technologies: optical beamforming in the spatial domain and optical channelization in the frequency domain. Compared with the use of microwave interface to transmit signals, it can reduce signal transmission loss, eliminate bandwidth limitations, and improve key performance of microwave photonic systems such as large bandwidth and large dynamics.

[0006] The present invention provides a microwave photon space-frequency coordinated processing device for all-optical signal transmission, and the specific technical solution is as follows: The device includes a light source unit, a spatial domain optical beamforming processing unit, and a frequency domain optical channelization processing unit; The light source unit includes a laser module and a first optical power splitter module; the laser module outputs a single-frequency laser, and the first optical power splitter module splits the single-frequency laser into two paths according to a set power ratio, and inputs the two paths into the spatial domain optical beam forming processing unit and the frequency domain optical channelization processing unit respectively; The spatial optical beamforming processing unit includes a second optical power division module, a carrier suppressed single sideband electro-optical modulation module, an optical delay network module and a first optical combiner module; the second optical power division module divides a received laser signal into a plurality of paths according to power; the divided laser signals are processed by the carrier suppressed single sideband electro-optical modulation module and the optical delay network module, and then combined and outputted by the first optical combiner module, and the carrier suppressed single sideband electro-optical modulation module is connected to an external radio frequency signal input; The frequency domain optical channelization processing unit includes a second optical combining module, an optical comb local oscillator module, a parallel optical filtering and channel separation module and a plurality of photoelectric detection modules; the optical comb local oscillator module inputs a received laser signal and a signal output by the first optical combining module into the second optical combining module for combined output; the output of the frequency domain optical channelization processing unit is connected to an acquisition processing module, and the output of the acquisition processing module is connected to a digital processing module.

[0007] Furthermore, the laser module adopts a laser in the 1550nm band, the output laser frequency is 193400GHz, and the output power is 200mW.

[0008] Furthermore, the power of the single-frequency laser beam output to the spatial optical beamforming processing unit through the first optical power division module is higher than the power of the single-frequency laser beam output to the frequency-domain optical channelization processing unit.

[0009] Furthermore, the first optical power division module performs two-way power division output on the single-frequency laser with a power ratio of no less than 9:1.

[0010] Furthermore, the second optical power division module inputs each branch laser signal output according to power equalization into the carrier suppressed single sideband electro-optical modulation module, the carrier suppressed single sideband electro-optical modulation module receives an external radio frequency signal to perform carrier suppressed electro-optical modulation on the laser signal, and outputs several single sideband optical signals to the optical delay network module after modulation, the optical delay network module performs delay processing on the received single sideband optical signal and outputs it to the first optical combiner module for combined output.

[0011] Furthermore, the carrier suppressed electro-optical modulation removes the laser carrier and the signal sideband on one side in each output optical signal, and only retains the signal sideband on the other side.

[0012] Furthermore, the optical comb local oscillator module modulates a received single-frequency laser to generate multi-frequency lasers with equal frequency intervals, and outputs the multi-frequency lasers to the second optical combining module.

[0013] Furthermore, the frequency interval of the optical comb local oscillator module for modulating and outputting multi-frequency laser light is the same as the channel bandwidth of the optical channelization processing.

[0014] Furthermore, the parallel optical filtering and channel separation module filters the optical signal output by the second optical combiner module in an end-to-end manner on the spectrum, separates each filtered channel on the transmission path, and inputs the separated output optical signals into the corresponding photoelectric detection module for photoelectric conversion.

[0015] The present invention also provides a microwave photon space-frequency coordinated processing method for all-optical signal transmission, the specific process is as follows: S1: Obtain a single-frequency laser and perform power division to divide the single-frequency laser into two laser outputs with different powers; S2: The power of a high-power single-frequency laser is evenly divided to obtain several lasers; a low-power single-frequency laser is modulated to obtain multi-frequency lasers with equally spaced frequencies; S3: performing carrier suppression wave electro-optical modulation on the obtained laser beams to remove the laser carrier and the signal sideband on one side; S4: delay processing is performed on the modulated optical signal after the carrier suppression wave electro-optical modulation, and synthesizes it into one optical signal; S5: combining the optical signal synthesized into one channel after the delay processing with the multi-frequency lasers with equal frequency intervals; S6: filtering the optical signals after the combined processing in a spectrum end-to-end manner, and separating each filtered channel on the transmission path; S7: Perform photoelectric conversion on the separated output optical signal and output it.

[0016] The beneficial effects of the present invention are as follows: The device of the present invention generates a single-frequency laser through a laser unit, and performs two-way power division of the single-frequency laser with a high power ratio. The two-way signal is processed and combined by a spatial optical beam forming processing unit and a frequency domain optical channelization processing unit respectively, thereby realizing all-optical signal transmission between the spatial domain and the frequency domain, avoiding signal loss caused by photoelectric conversion and electro-optical conversion, eliminating the bandwidth limitation caused by the microwave interface, and being conducive to improving the processing bandwidth; the device avoids the use of a microwave interface between the optical beam forming processing and the optical channelization processing, and compared with the integration of microwave interface signal transmission, which requires optical chip + microwave chip + optical chip integration, only the problem of optical chip integration needs to be solved, which is easy to integrate. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the device architecture of the present invention.

[0018] Figure 2 It is a schematic flow chart of the method of the present invention. DETAILED DESCRIPTION

[0019] The following description clearly and completely describes the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] In the description of the embodiments of the present invention, it should be noted that the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the invention product is usually placed when in use, or the orientation or positional relationship commonly understood by those skilled in the art, or the orientation or positional relationship in which the invention product is usually placed when in use, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first" and "second" are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0021] In the description of the embodiments of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0022] Example 1 Embodiment 1 of the present invention discloses a microwave photon space-frequency coordinated processing device for all-optical signal transmission, such as Figure 1 As shown, the device includes a light source unit, a spatial domain optical beam forming processing unit, and a frequency domain optical channelization processing unit; The light source unit includes a laser module and a first optical power splitter module; the laser module outputs a single-frequency laser, and the first optical power splitter module splits the single-frequency laser into two paths according to a set power ratio, which are respectively recorded as an upper branch and a lower branch, and the laser signal of the upper branch is input to a spatial domain optical beam forming processing unit, and the laser signal of the lower branch is input to a frequency domain optical channelization processing unit; Specifically, the power of the laser signal of the upper branch is greater than the power of the laser signal of the upper branch; As a preferred embodiment, the power ratio of the upper and lower branches outputting laser light is 9:1 or higher; the specific power ratio is set according to the actual situation and is not specifically limited here; In this embodiment, the power ratio of the upper and lower branches is 9:1 as an example, 90% of the power is output in the upper branch, that is, 180mW, and 10% of the power is output in the lower branch, that is, 20mW; the frequency of the laser remains unchanged at 193400GHz; As a preferred embodiment, the laser module adopts a laser in the 1550nm band, the output laser frequency is set to 193400GHz (this frequency is C34 of the ITU standard wavelength), and the output power is set to 200mW.

[0023] The spatial optical beamforming processing unit comprises a second optical power division module, a carrier suppression single sideband electro-optical modulation module, an optical delay network module and a first optical combining module which are connected in sequence; The second optical power division module divides the received laser signal into a plurality of paths according to power; Specifically, the single-frequency laser of the upper branch enters the 1-to-4 equal-division optical power splitter, outputting 4 channels of single-frequency lasers, each with a power of 45mW and a frequency of 193400GHz; The first optical combining module combines the four equally divided laser signals and outputs them; As a preferred embodiment, the second optical power division module inputs 4 single-frequency lasers output according to power equalization into the 4-channel carrier suppressed single-sideband electro-optical modulation module, modulates with the 4-channel RF signal input from the outside, and after modulation, outputs several single-sideband optical signals to the 4-channel optical delay network module; The carrier suppressed electro-optical modulation removes the laser carrier and the signal sideband on one side in each output optical signal, and only retains the signal sideband on the other side; for example, only the +1 order signal sideband is retained in each optical signal.

[0024] Since carrier suppressed single sideband electro-optical modulation is adopted, the output 4 optical signals are still single frequency signals, but the frequency becomes (193400+ ) GHz, is the frequency of the external input RF signal, in GHz; The optical delay network module performs delay processing on the received single-sideband optical signal and then outputs it to the first optical combiner module for combined output; Specifically, the 4-channel frequency after delay processing is (193400+ )GHz optical signal is input into the 4-in-1 optical combiner module and synthesized into a single channel with a frequency of (193400+ ) GHz optical signal.

[0025] The frequency domain optical channelization processing unit includes a second optical combining module, an optical comb local oscillator module, a parallel optical filtering and channel separation module and a plurality of photoelectric detection modules; As a preferred embodiment, the optical comb local oscillator module modulates a received single-frequency laser to generate multi-frequency lasers with equal frequency intervals, and outputs them to the second optical combining module; In this embodiment, the frequency interval of the optical comb local oscillator module for modulating and outputting multi-frequency laser light is the same as the channel bandwidth of the optical channelization processing.

[0026] Specifically, the optical signal with a power of 20mW and a frequency of 193400GHz in the lower branch is input into the optical comb local oscillator module, and after processing, an optical signal with four frequencies is output, namely 193400GHz, 193401GHz, 193402GHz, and 193403GHz, that is, a single-frequency optical signal is generated every 1GHz. The optical comb local oscillator module inputs a received laser signal and a signal output by the first optical combiner module into the second optical combiner module for combined output; Specifically, the frequency of channel 1 is (193400+ )GHz optical signal and 1 channel containing 4 frequencies of 193400GHz, 193401GHz, 193402GHz, and 193403GHz enter the 2-in-1 optical combiner module and are combined into one channel containing 193400GHz, 193401GHz, 193402GHz, 193403GHz and (193400+ ) GHz frequency optical signal and output it.

[0027] As a preferred embodiment, the optical signal containing the above-mentioned frequency is input into a 4-channel parallel optical filtering and channel separation module; Specifically, the filter passbands of the parallel filter modules are set to: channel 1 covers [193400 GHz ~ 193401 GHz), channel 2 covers [193401 GHz ~ 193402 GHz), channel 3 covers [193402 GHz ~ 193403 GHz) and channel 4 covers [193403 GHz ~ 193404 GHz); Therefore, among the optical signals containing multiple frequencies, the 193400 GHz optical signal is allocated to channel 1, the 193401 GHz optical signal is allocated to channel 2, the 193402 GHz optical signal is allocated to channel 3, and the 193403 GHz optical signal is allocated to channel 4. ) GHz signal is based on The size of is assigned to one of channels 1 to 4. For example, ∈[0,1) GHz, the signal enters channel 1; ∈[1,2) GHz, the signal enters channel 2; ∈[2,3) GHz, the signal enters channel 3; ∈[3,4) GHz, the signal enters channel 4.

[0028] The parallel optical filtering and channel separation module filters the optical signals output by the second optical combiner module in an end-to-end manner on the spectrum, separates each filtered channel on the transmission path, and inputs the separated output 4 optical signals into the corresponding photoelectric detection module for photoelectric conversion.

[0029] Specifically, the photoelectric detection module is provided with 4, and the optical signals in the 4 channels enter the 4 photoelectric detection modules simultaneously. When there are (193400+ )GHz optical signal and an optical signal with a frequency of 193400GHz, 193401GHz, 193402GHz, 193403GHz, will output an intermediate frequency signal under the action of the optical beat frequency effect, without (193400+ ) Other channels of GHz optical signals will have no output signal because the photodetector cannot respond to single-frequency DC optical signals; The output of the frequency domain optical channelization processing unit is connected to an acquisition processing module, and the output of the acquisition processing module is connected to the digital processing module; The channel with the intermediate frequency signal is converted into a digital signal after the corresponding acquisition processing, and then the digital signal processing is completed.

[0030] Example 2 Embodiment 2 of the present invention discloses a microwave photon space-frequency coordinated processing method for all-optical signal transmission, based on the device described in embodiment 1 above, such as Figure 2 As shown, the specific steps are as follows: S1: Obtain a single-frequency laser and perform power division to divide the single-frequency laser into two laser outputs with different powers; Specifically, through a 1550nm band laser, the output laser frequency is set to 193400GHz (this frequency is C34 of the ITU standard wavelength), and the output power is set to 200mW to obtain a single-frequency laser.

[0031] S2: The power of a high-power single-frequency laser is evenly divided to obtain four lasers; a low-power single-frequency laser is modulated to obtain multi-frequency lasers with equally spaced frequencies; The power ratio between the power of a high-power single-frequency laser and the power of a low-power single-frequency laser is not less than 9:1; In this embodiment, 90% power, i.e. 180 mW, is output in the upper branch, and the frequency of the laser remains unchanged at 193400 GHz; After 4 equal power divisions, 4 single-frequency lasers are output, each with a power of 45mW and a frequency of 193400GHz; In this embodiment, 10% power, i.e. 20 mW, is output in the lower branch, and the frequency of the laser remains unchanged at 193400 GHz; After modulation, an optical signal with four frequencies is output, namely 193400 GHz, 193401 GHz, 193402 GHz, and 193403 GHz, that is, a single-frequency optical signal is generated every 1 GHz.

[0032] S3: Carrier suppression wave electro-optical modulation is performed on the obtained 4-channel laser and the external input 4-channel RF signal to remove the laser carrier and the signal sideband on one side, and the output frequency of the 4 channels is (193400+ ) GHz single frequency optical signal, The frequency of the external RF signal, in GHz.

[0033] S4: The 4-channel frequency after carrier suppression wave electro-optical modulation is (193400+ )GHz optical signal is delayed and synthesized into a frequency of (193400+ ) GHz optical signal; S5: Combine the optical signal after delay processing with the multi-frequency laser with equal frequency intervals to obtain a channel containing 193400GHz, 193401GHz, 193402GHz, 193403GHz and (193400+ ) GHz frequency optical signal; S6: filtering the optical signals after the combined processing in a spectrum end-to-end manner, and separating each filtered channel on the transmission path; S7: Perform photoelectric conversion on the separated output optical signal and output it.

[0034] The present invention is not limited to the above-mentioned specific embodiments, but extends to any new features or any new combination disclosed in this specification, as well as any new method or process steps or any new combination disclosed.

Claims

1. A microwave photon space-frequency coordinated processing device for all-optical signal transmission, characterized in that: It includes a light source unit, a spatial domain optical beam forming processing unit and a frequency domain optical channelization processing unit; The light source unit includes a laser module and a first optical power splitter module; the laser module outputs a single-frequency laser, and the first optical power splitter module splits the single-frequency laser into two paths according to a set power ratio, and inputs the two paths into the spatial domain optical beam forming processing unit and the frequency domain optical channelization processing unit respectively; The spatial optical beamforming processing unit includes a second optical power division module, a carrier suppressed single sideband electro-optical modulation module, an optical delay network module and a first optical combiner module; the second optical power division module divides a received laser signal into a plurality of paths according to power; the divided laser signals are processed by the carrier suppressed single sideband electro-optical modulation module and the optical delay network module, and then combined and outputted by the first optical combiner module, and the carrier suppressed single sideband electro-optical modulation module is connected to an external radio frequency signal input; The frequency domain optical channelization processing unit includes a second optical combining module, an optical comb local oscillator module, a parallel optical filtering and channel separation module and a plurality of photoelectric detection modules; the optical comb local oscillator module inputs a received laser signal and a signal output by the first optical combining module into the second optical combining module for combined output; the output of the frequency domain optical channelization processing unit is connected to an acquisition processing module, and the output of the acquisition processing module is connected to a digital processing module.

2. The microwave photon space-frequency coordinated processing device for all-optical signal transmission according to claim 1, characterized in that: The laser module adopts a laser in the 1550nm band, the output laser frequency is 193400GHz, and the output power is 200mW.

3. The microwave photon space-frequency coordinated processing device for all-optical signal transmission according to claim 1, characterized in that: The power of the single-frequency laser beam output to the spatial optical beamforming processing unit through the first optical power division module is higher than the power of the single-frequency laser beam output to the frequency domain optical channelization processing unit.

4. The microwave photon space-frequency coordinated processing device for all-optical signal transmission according to claim 3, characterized in that: The first optical power division module performs two-way power division output on the single-frequency laser with a power ratio of no less than 9:

1.

5. The microwave photon space-frequency coordinated processing device for all-optical signal transmission according to claim 1, characterized in that: The second optical power division module inputs each branch laser signal output according to power equalization into the carrier suppressed single sideband electro-optical modulation module, and the carrier suppressed single sideband electro-optical modulation module receives an external radio frequency signal to perform carrier suppressed electro-optical modulation on the laser signal, and outputs several single sideband optical signals to the optical delay network module after modulation, and the optical delay network module performs delay processing on the received single sideband optical signal and outputs it to the first optical combiner module for combined output.

6. The microwave photon space-frequency coordinated processing device for all-optical signal transmission according to claim 5, characterized in that: The carrier suppressed electro-optical modulation removes the laser carrier and the signal sideband on one side from each output optical signal, and only retains the signal sideband on the other side.

7. The microwave photon space-frequency coordinated processing device for all-optical signal transmission according to claim 1, characterized in that: The optical comb local oscillator module modulates a received single-frequency laser to generate multi-frequency lasers with equal frequency intervals, and outputs the multi-frequency lasers to the second optical combining module.

8. The microwave photon space-frequency coordinated processing device for all-optical signal transmission according to claim 7, characterized in that: The frequency interval size of the multi-frequency laser output by the optical comb local oscillator module is the same as the channel bandwidth of the optical channelization processing.

9. The microwave photon space-frequency coordinated processing device for all-optical signal transmission according to claim 1, characterized in that: The parallel optical filtering and channel separation module filters the optical signals output by the second optical combiner module in an end-to-end manner on the spectrum, separates each filtered channel on the transmission path, and inputs the separated output optical signals into the corresponding photoelectric detection modules for photoelectric conversion.

10. A microwave photon space-frequency coordinated processing method for all-optical signal transmission, characterized in that: include: S1: Obtain a single-frequency laser and perform power division to divide the single-frequency laser into two laser outputs with different powers; S2: The power of a high-power single-frequency laser is evenly divided to obtain several lasers; a low-power single-frequency laser is modulated to obtain multi-frequency lasers with equally spaced frequencies; S3: performing carrier suppression wave electro-optical modulation on the obtained laser beams to remove the laser carrier and the signal sideband on one side; S4: delay processing is performed on the modulated optical signal after the carrier suppression wave electro-optical modulation, and synthesizes it into one optical signal; S5: combining the optical signal synthesized into one channel after the delay processing with the multi-frequency lasers with equal frequency intervals; S6: filtering the optical signals after the combined processing in a spectrum end-to-end manner, and separating each filtered channel on the transmission path; S7: Perform photoelectric conversion on the separated output optical signal and output it.

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