CN113691315A - Reconfigurable integrated microwave photon band-pass filter - Google Patents
Reconfigurable integrated microwave photon band-pass filter Download PDFInfo
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- CN113691315A CN113691315A CN202110973046.1A CN202110973046A CN113691315A CN 113691315 A CN113691315 A CN 113691315A CN 202110973046 A CN202110973046 A CN 202110973046A CN 113691315 A CN113691315 A CN 113691315A
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- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
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- G02B6/28—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals
- G02B6/293—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means
- G02B6/29331—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means operating by evanescent wave coupling
- G02B6/29335—Evanescent coupling to a resonator cavity, i.e. between a waveguide mode and a resonant mode of the cavity
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Abstract
The invention discloses a reconfigurable integrated microwave photon band-pass filter, and belongs to the field of microwave photon signal processing. The method comprises the following steps: a semiconductor laser for outputting a continuous optical carrier signal; the optical beam splitter divides the continuous optical carrier signal into two paths of light beams; the microwave optical signal generating module is used for generating a microwave modulation signal and modulating the microwave modulation signal with one path of light beam output by the optical beam splitter to generate a microwave optical signal; integrating a multistage cascade second-order micro-ring filter, and performing bandwidth reconstruction, suppression ratio and center frequency tuning on the generated microwave optical signals; the optical coupler is used for combining the microwave optical signal and the other path of optical beam output by the optical beam splitter; and the microwave electric signal receiving module is used for converting the combined microwave optical signal into an electric signal and receiving the microwave electric signal. The invention can realize narrow-band filtering on the basis of high radio frequency out-of-band rejection ratio, and realize the bandwidth reconstruction and the flexible tuning of the center frequency of the microwave optical signal in a wider range.
Description
Technical Field
The invention belongs to the field of microwave photon signal processing, and particularly relates to a reconfigurable integrated microwave photon band-pass filter.
Background
The microwave photon filter is a device which adopts an optical method and an optical element to realize a filtering function in a microwave frequency band. The microwave photon filter is different from the traditional microwave filter in that the microwave photon filter processes signals in an optical domain, so that the microwave photon filter has the advantages that an optical element has huge bandwidth advantage and can directly filter high-frequency signals, meanwhile, the microwave optical filter has good tunability and reconfigurability, the central wavelength and the filtering effect of the filter can be adjusted according to actual needs, and the microwave photon filter has the characteristics of low loss, electromagnetic interference resistance and the like when microwave signals are processed in the optical domain, so that the microwave photon filter has huge technical advantages.
At present, microwave photonic filters based on discrete devices have been developed relatively well, but discrete devices have disadvantages of large size, high power consumption, low stability, and obvious limitation in terms of practicability, so that the microwave photonic filters based on integrated devices are currently mainly researched. In the prior art, a part of microwave photonic filters based on integrated devices have the problems of jitter of a filtering area and high insertion loss; in order to solve the problem of filter area jitter and to realize passband flatness, microwave photonic filters based in part on integrated devices generally design the coupling coefficients of the micro-ring symmetrically, but such a symmetric design usually has a great limitation on bandwidth tuning. In the prior art, the microwave photonic filter based on an integrated device still has defects in the aspects of narrow bandwidth, high rejection ratio and high flexibility, and is difficult to adapt to different filtering performance requirements in various application approaches.
Disclosure of Invention
Aiming at the defects and improvement requirements of the prior art, the invention provides a reconfigurable integrated microwave photonic band-pass filter, aiming at realizing narrow-band filtering on the basis of high radio frequency out-of-band rejection ratio and realizing the bandwidth reconfiguration and flexible tuning of the central frequency of a microwave optical signal in a wider range.
To achieve the above object, the present invention provides a reconfigurable integrated microwave photonic band-pass filter, comprising:
a semiconductor laser for outputting a continuous optical carrier signal;
the optical beam splitter is used for splitting the continuous optical carrier signal into two paths of light beams;
the microwave optical signal generating module is used for generating a microwave modulation signal and modulating the microwave modulation signal with one path of light beam output by the optical beam splitter to generate a microwave optical signal;
integrating a multistage cascade second-order micro-ring filter, and performing bandwidth reconstruction on the generated microwave optical signal, and tuning the suppression ratio and the center frequency;
the optical coupler is used for combining the microwave optical signal processed by the integrated multistage cascade second-order micro-ring filter with the other path of optical beam output by the optical beam splitter;
and the microwave electric signal receiving module is used for converting the combined microwave optical signal into a microwave electric signal and receiving the microwave signal.
Further, the integrated multistage cascade second-order micro-ring filter includes: the cascade-connected second-order micro-ring unit comprises a plurality of second-order micro-ring units, wherein the input of each second-order micro-ring unit is connected with the output of the previous second-order micro-ring unit through a waveguide.
Further, the second order microring unit includes:
at least one coupling area is an adjustable coupling area and is used for controlling the bandwidth and the rejection ratio of the second-order micro-ring unit;
at least two micro-rings which form a resonant cavity together with the adjustable coupling area and select the frequency of input light;
and the optical phase shifters are respectively positioned on the micro-rings and the adjustable coupling areas and are respectively used for controlling the resonance wavelength of each micro-ring and regulating and controlling the coupling coefficient of the adjustable coupling areas.
Further, the adjustable coupling region comprises: two curved coupled waveguide arms and equal length waveguides on the two curved coupled waveguide arms.
Further, the optical phase shifter is a heating electrode, a PN junction, an optical force.
Further, the integrated multistage cascade second-order micro-ring filter is made of the following materials: silicon, silicon nitride, silicon oxynitride, silicon oxide, silicon dioxide, or an organic polymer.
Further, the integrated multistage cascade second-order micro-ring filter is a strip waveguide, a ridge waveguide, a slit waveguide or a surface plasma waveguide.
Further, the microwave optical signal generating module includes:
the radio frequency signal receiving antenna is used for outputting radio frequency microwave signals with different microwave frequencies as modulation signals;
and the electro-optical modulator is used for modulating one path of light beam output by the optical beam splitter and a modulation signal output by the radio-frequency signal receiving antenna to generate a microwave optical signal.
Further, the microwave electric signal receiving module comprises:
the photoelectric detector is used for converting the combined microwave optical signal into a microwave electric signal;
and the radio frequency signal transmitting antenna is used for receiving the microwave signal.
Further, still include:
the first polarization controller is used for controlling the polarization direction of one path of light beam output by the optical beam splitter to be consistent with the polarization direction of the electro-optical modulator;
and the second polarization controller is used for controlling the polarization direction of the other path of light beam output by the optical beam splitter to be consistent with the polarization direction of the microwave optical signal processed by the integrated multistage cascade second-order micro-ring filter.
Generally, by the above technical solution conceived by the present invention, the following beneficial effects can be obtained:
(1) the reconfigurable integrated microwave photon band-pass filter provided by the invention can realize narrow-band filtering on the basis of high radio frequency out-of-band rejection ratio through the arranged integrated multistage cascade second-order micro-ring filter, and realize the bandwidth reconfiguration and the flexible tuning of the central frequency of a microwave optical signal in a wider range.
(2) The reconfigurable integrated microwave photon band-pass filter provided by the invention has the advantages of series micro-rings and Coupled Resonant Optical Waveguides (CROWs) on the performance by adopting the multistage cascade second-order micro-ring units, and the series structure can effectively reduce the bandwidth of the micro-rings, realize the effect of narrow-band filtering and improve the bandwidth adjusting range of devices; based on the CROW structure, the jitter of a filtering area can be reduced, the effect of flattening a pass band is realized, and compared with the traditional mode of directly connecting micro-rings in series, the low-insertion-loss micro-ring filter has lower insertion loss; meanwhile, the suppression ratio of the optical filter can be effectively improved by adopting the multistage cascade second-order micro-ring units, and the microwave photon filter with high suppression ratio is further realized.
(3) According to the reconfigurable integrated microwave photonic band-pass filter provided by the invention, each coupling region adopts the optical phase shifter, the adjustable design of the coupling region is realized, different coupling states are realized by controlling the coupling coefficient of the coupling region, the design with asymmetric coupling coefficient can realize the filtering with narrower bandwidth, and the bandwidth tuning range of the microwave photonic filter is improved; the design of the optical phase shifter is adopted on each micro-ring, so that the resonance wavelength of each micro-ring can be independently tuned, and the bandwidth reconstruction range of the microwave photonic filter is further expanded.
(4) According to the reconfigurable integrated microwave photonic band-pass filter provided by the invention, each second-order micro-ring unit can be independently tuned and tested, each unit can be independently tuned through the test port, and the filtering shapes of a plurality of units can be monitored simultaneously, so that an ideal effect can be conveniently obtained; in addition, compared with the existing high-order cascade micro-ring, the distance between the coupling regions has strict process precision requirements, the tolerance of the second-order micro-ring unit in the invention on manufacturing is larger, and the process requirements are reduced.
(5) The transmission loss of the waveguide of the integrated multistage cascade second-order micro-ring filter can be reduced by adopting different waveguide materials or waveguide structures.
In conclusion, the reconfigurable integrated microwave photonic band-pass filter provided by the invention can achieve the effects of narrow bandwidth, reconfigurable bandwidth and tunable center frequency on the basis of high radio frequency out-of-band rejection ratio; the method has high flexibility, and can meet the frequency band resource application requirements under different scenes and different services.
Drawings
Fig. 1 is a schematic structural diagram of a reconfigurable integrated microwave photonic band-pass filter according to an embodiment of the present invention.
Fig. 2 is a schematic diagram of an integrated multistage cascaded second-order micro-ring filter according to an embodiment of the present invention.
Fig. 3 is a schematic structural diagram of a second-order microring unit according to an embodiment of the present invention.
Fig. 4 is a diagram of a simulation result of bandwidth reconstruction of the integrated microwave photonic band-pass filter according to the embodiment of the present invention.
Fig. 5 is a diagram of a simulation result of center frequency tuning of the integrated microwave photonic band-pass filter according to the embodiment of the present invention.
The same reference numbers will be used throughout the drawings to refer to the same or like elements or structures, wherein:
11-a semiconductor laser, 12-an optical beam splitter, 13-a first polarization controller, 14-a second polarization controller, 15-an electro-optical modulator, 16-a radio-frequency signal receiving antenna, 17-an integrated multistage cascade second-order micro-ring filter, 18-an optical coupler, 19-a radio-frequency signal transmitting antenna, 20-a photoelectric detector, 21-a second-order micro-ring unit, 22-a coupling grating, 211-a first micro-ring, 212-a second micro-ring, 213-a first adjustable coupling region, 214-a second adjustable coupling region, 215-a third adjustable coupling region, 216-an optical phase shifter, 217-a curved coupling waveguide arm, 219-an isometric waveguide.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
In the description of the embodiments of the present invention, it should be noted that the terms "upper" and "lower" are used for describing the orientation relation based on the orientation relation shown in the drawings or the orientation relation of the product which is usually placed when the product is used, and are only used for facilitating the description of the present invention and simplifying the description, but do not indicate or imply that the device or the element which is referred to must have a specific orientation structure and operation, and thus, cannot be understood as limiting the present invention.
In the present invention, the terms "first", "second", and the like in the description and the drawings are used for distinguishing similar objects, and are not necessarily used for describing a particular order or sequence.
As shown in fig. 1, a schematic structural diagram of a reconfigurable integrated microwave photonic band-pass filter of the present invention includes a semiconductor laser 11, an optical beam splitter 12, a first polarization controller 13, a second polarization controller 14, an electro-optical modulator 15, an optical coupler 18, a photodetector 20, a radio frequency signal receiving antenna 16, a radio frequency signal transmitting antenna 19, and an integrated multistage cascade second-order micro-ring filter 17.
The semiconductor laser 11 outputs a continuous optical carrier signal, and after being input to the optical beam splitter 12, the continuous optical carrier signal is divided into two beams, one beam is used for loading a modulation signal, and the other beam is used for recovering the carrier signal. The path of light beam for loading the modulation signal passes through the first polarization controller 13, and the polarization direction of the light beam is controlled to be consistent with the polarization direction of the electro-optical modulator 15, so that the modulation efficiency is improved; then, the microwave signals are input into an electro-optical modulator 15, a radio frequency signal receiving antenna 16 outputs radio frequency microwave signals with different microwave frequencies to serve as modulation signals to the electro-optical modulator 15, the electro-optical modulator 15 modulates the received loading modulation signals and the modulation signals to generate microwave optical signals, and conversion from the microwave electrical signals to the microwave optical signals is achieved; the microwave photon signals modulated by the electro-optical modulator 15 are transmitted through optical fibers and input to the integrated multistage cascade second-order micro-ring filter 17 through the coupling grating 22 on the integrated multistage cascade second-order micro-ring filter 17, and the integrated multistage cascade second-order micro-ring filter is used for realizing the tuning of the bandwidth reconstruction, the rejection ratio and the center frequency of the filter. After the path of light beam for recovering the carrier signal passes through the second polarization controller 14, the polarization direction of the light beam is consistent with the polarization direction of the microwave optical signal processed by the integrated multistage cascade second-order micro-ring filter 17, and then the light beam is transmitted into the optical coupler 18 through the optical fiber or the optical waveguide on the integrated chip and is combined with the microwave optical signal processed by the integrated multistage cascade second-order micro-ring filter 17, so that the carrier signal is provided for the beat frequency of the photoelectric detector; the combined microwave optical signal is output to the photodetector 20, the photodetector 20 is configured to convert the received combined microwave optical signal into a microwave electrical signal, and complete photoelectric conversion, and the finally converted microwave electrical signal is received by the radio frequency signal transmitting antenna 19. In other embodiments, the radio frequency signal receiving antenna and the electro-optical modulator may be other microwave optical signal generating modules capable of generating microwave modulation signals and modulating the microwave modulation signals with one path of light beam output by the optical beam splitter to generate microwave optical signals; the photoelectric detector and the radio frequency signal transmitting antenna can be other microwave electric signal receiving modules which can convert the combined microwave optical signal into a microwave electric signal and receive the microwave signal.
As shown in fig. 2, the integrated multistage cascade second-order micro-ring filter 17 includes N cascade second-order micro-ring units, where N is a positive integer. Each cascaded second-order microring is a unit, the input of each unit is directly connected with the output of the previous unit through a waveguide, and the effect of the optical filter is improved through the combined action of the second-order microring units 21.
The coupling grating 22 is positioned at the input end of the first second-order micro-ring unit and the output end of the last second-order micro-ring unit, and is used for coupling the microwave photon signal output from the electro-optical modulator 15 into the input waveguide in the first second-order micro-ring unit; and couples the signal output in the last second order micro-ring cell into the optical coupler 18. In other embodiments, coupling gratings may be disposed at other ports of the second order micro-ring unit besides the input and output ports, so as to perform separate testing on each second order micro-ring unit.
The second-order micro-ring unit 21 is a component unit of an integrated multistage cascade second-order micro-ring filter, each unit can be controlled and tested independently, and the effect of the final optical filter device is determined by the superposition of the filtering effects of the units.
As shown in fig. 3, the second-order microring unit 21 in the present embodiment includes: two microrings, three coupling regions, and an optical phase shifter 216 located on the microrings and the coupling regions, wherein the coupling regions are tunable coupling regions. In other embodiments, the number of the micro-rings may be other numbers of two or more, and the structures of the plurality of micro-rings may be the same or different; the structures of the coupling regions can be the same or different, and the number of the adjustable coupling regions can be one or other numbers.
The two micro rings, namely the first micro ring 211 and the second micro ring 212, are respectively located between the three adjustable coupling areas, and the two micro rings jointly form a resonant cavity through the connection of the adjustable coupling areas, so that the frequency of input light is selected, and the function of optical filtering is realized.
Three adjustable coupling regions, namely a first adjustable coupling region 213, a second adjustable coupling region 214 and a third adjustable coupling region 215, are used to control the bandwidth and rejection ratio of each stage of the second-order micro-ring unit.
The tunable coupling region includes: two curved coupled waveguide arms 217 and equal length waveguides 219 on the two curved coupled waveguide arms.
The optical phase shifters on the tunable coupling regions are disposed on the upper and lower curved coupling waveguide arms 217 for controlling the phase difference between the upper and lower arms of the coupling region, thereby adjusting the coupling coefficient of each tunable coupling region. The optical phase shifter is positioned on the micro-rings and used for controlling the resonant wavelength of each micro-ring to change the frequency difference between a resonant peak and an optical carrier, so that the filtering center frequency is adjustable, the resonant wavelength of each level of second-order micro-ring is controlled to be aligned, the effects of each level of second-order micro-ring are superposed, and the microwave photon filter with high rejection ratio and narrow bandwidth is realized. The optical phase shifter in this embodiment may be a device for adjusting and controlling phase, such as a heating electrode, a PN junction, and an optical force. Note that, in fig. 3, only the positions of some of the optical phase shifters are shown.
Parameters such as bandwidth, central frequency and the like of the microwave photon filter are adjusted by adjusting the optical phase shifter of the micro-ring and the coupling area. The method comprises the following specific steps that microwave optical signals loaded with different microwave frequencies and output from an electro-optical modulator 15 are input into an integrated multistage cascade second-order micro-ring filter 17 through a coupling grating, enter a first adjustable coupling area through an input waveguide of a first cascade second-order micro-ring unit, the phase difference of an upper arm and a lower arm is changed by adjusting and controlling optical phase shifters on the upper bending coupling waveguide arm and the lower bending coupling waveguide arm, the light passing through the upper bending coupling waveguide arm and the lower bending coupling waveguide arm interferes when entering a first micro-ring due to the phase difference, the intensity of the input first micro-ring optical signal can be controlled by controlling the phase difference, the coupling coefficient of the first adjustable coupling area is adjusted, and the resonant wavelength of the first micro-ring is controlled by adjusting and controlling the optical phase shifters on the first micro-ring after entering the first micro-ring; the optical signal entering the first micro-ring is coupled into the second micro-ring again through the same principle after being transmitted to the second adjustable coupling area, the intensity of the optical signal which is input into the second micro-ring is also controlled, the coupling coefficient of the second adjustable coupling area is regulated, and the resonant wavelength of the second micro-ring is controlled by regulating and controlling the optical phase shifter on the second micro-ring; after light beams are transmitted to a third adjustable coupling area in a second micro ring, the intensity of output light signals of a first second-order micro ring is adjusted and controlled by adjusting and controlling the coupling coefficient of the third adjustable coupling area, signal processing of one unit is completed, the output light signals are output to an input waveguide of the next unit through the output waveguide for subsequent optical filtering, after the optical filtering of a plurality of units, the light signals are output to a coupling grating, the light signals enter an optical fiber and the optical carrier of the other path for beam combination, and an input photoelectric detector carries out beat frequency to obtain electric signals.
Adjusting the optical phase shifters on the two micro-rings, and controlling the resonance wavelengths of the two micro-rings to be consistent or close to each other to realize the effect of optical band-pass filtering; adjusting the optical phase shifter on the adjustable coupling area to an appropriate coupling coefficient to obtain a required bandwidth, namely when a filter with large bandwidth and high flatness is required, adjusting the coupling coefficient of the second-order micro-ring unit of each stage to be symmetrical, namely the coupling coefficients of the first adjustable coupling area and the third adjustable coupling area are the same, and adjusting the resonance of the second-order micro-ring unit of each stage to be the same in wavelength or slightly different in wavelength; when a narrow bandwidth is needed, the coupling coefficients of the second-order micro-ring units of each level are adjusted to be asymmetric, namely the coupling coefficients of the first adjustable coupling area and the third adjustable coupling area are different, the filtering effect after the bandwidth and the rejection ratio of all the second-order micro-rings are superposed is ensured to be a desired result, and then the resonance of the second-order micro-ring units of each level is adjusted to be the same wavelength, so that the filtering effect of the second-order micro-rings is superposed, and the bandwidth reconstruction range and the radio frequency out-of-band rejection ratio of the microwave photonic filter are further improved. The adopted second-order micro-ring unit can keep the pass band flat and low insertion loss, each level of second-order micro-ring unit can be independently regulated, the process precision requirement on the micro-ring interval is reduced in the manufacturing process, and tuning and alignment are more conveniently carried out in the test process.
The integrated multistage second-order cascade micro-ring optical filter can simultaneously change the resonance wavelength of all micro-rings by adjusting the phase shifters on all the micro-rings, thereby moving the phase center frequency of the all-pass filter.
The optical phase shifter in this embodiment is a heating electrode, and tuning of the central wavelength of the micro-ring and the coupling coefficient of the coupling region is realized by adjusting the bias voltage of each heating electrode, so that tuning of the bandwidth, the rejection ratio and the central frequency of the filter is realized.
As shown in fig. 4, which is a simulation result of bandwidth reconstruction according to an embodiment of the present invention, in this embodiment, signals near the center frequency of 9GHz are selected, and signals far from the center frequency are filtered: when the required signal bandwidth is small, the microwave photon filter can be adjusted to a narrow bandwidth state to filter out unnecessary signals; when the required signal bandwidth is large, the microwave photon filter can be adjusted to a large bandwidth state, and the required signal can be completely selected. Meanwhile, it can be seen that, in the narrow bandwidth state and the large bandwidth state, the difference between the highest point and the lowest point of the signal can reach more than 60dB, which indicates that the reconfigurable integrated microwave photonic band-pass filter in the embodiment can effectively select the required signal, and has a strong suppression effect on the unnecessary signal, that is, a high suppression ratio in the whole bandwidth reconfiguration range. The device can reconstruct the bandwidth of the microwave photon filter in a large range and has higher rejection ratio.
As shown in fig. 5, in this embodiment, the center frequency is selected at 6GHz, 18GHz, and 32GHz to perform selective filtering of signals, and different bias voltages are applied to the heating electrodes on the micro-ring to change the effective refractive index of the micro-ring waveguide, so as to change the resonant wavelength of the micro-ring, change the frequency difference between the resonant peak and the optical carrier, and achieve adjustable filtering center frequency. It can be seen from the figure that the out-of-band rejection ratio can reach more than 60dB at different center frequencies, no matter at low frequency or high frequency, the same bandwidth reconstruction effect and high rejection ratio can be achieved, and the invention is demonstrated to have good center frequency tuning performance.
The integrated multistage cascade second-order micro-ring filter can adopt but is not limited to the following material systems: silicon, organic polymers, silicon nitride, silicon oxynitride, silicon oxide, silicon dioxide, or the like.
The integrated multistage cascade second-order micro-ring filter of the invention can adopt but is not limited to the following waveguide structure: a strip waveguide, a ridge waveguide, a slit waveguide, a surface plasmon waveguide, or the like.
By adopting different waveguide materials or waveguide structures, the transmission loss of the waveguide of the integrated multistage cascade second-order micro-ring filter can be reduced, the lower limit of the bandwidth adjusting range is further reduced, and narrow-band filtering is realized.
The microwave photon filter has the structure that devices such as a laser, an electro-optical modulator, an optical filter device, a photoelectric detector, an optical beam splitter, a coupler and the like can be integrated on a chip, and optical fibers in a link can be replaced by integrated optical waveguides, so that the integrated microwave photon filter on the chip is realized.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. A reconfigurable integrated microwave photonic band pass filter, comprising:
a semiconductor laser (11) for outputting a continuous optical carrier signal;
the optical beam splitter (12) is used for splitting the continuous optical carrier signal into two paths of light beams;
the microwave optical signal generating module is used for generating a microwave modulation signal and modulating the microwave modulation signal with one path of light beam output by the optical beam splitter (12) to generate a microwave optical signal;
the integrated multistage cascade second-order micro-ring filter (17) carries out bandwidth reconstruction on the generated microwave optical signal, and the suppression ratio and the center frequency are tuned;
the optical coupler (18) is used for combining the microwave optical signal processed by the integrated multistage cascade second-order micro-ring filter (17) with the other path of optical beam output by the optical beam splitter (12);
and the microwave electric signal receiving module is used for converting the combined microwave optical signal into a microwave electric signal and receiving the microwave signal.
2. A reconfigurable integrated microwave photonic band-pass filter according to claim 1, characterized in that the integrated multistage cascaded second-order microring filter (17) comprises: the cascade-connected second-order micro-ring unit comprises a plurality of second-order micro-ring units (21), wherein the input of each second-order micro-ring unit (21) is connected with the output of the previous second-order micro-ring unit (21) through a waveguide.
3. A reconfigurable integrated microwave photonic band-pass filter according to claim 2, characterized in that the second-order microring unit (21) comprises:
at least one coupling area is an adjustable coupling area and is used for controlling the bandwidth and the rejection ratio of the second-order micro-ring unit;
at least two micro-rings which form a resonant cavity together with the adjustable coupling area and select the frequency of input light;
and the optical phase shifters (216) are respectively positioned on the micro-rings and the adjustable coupling areas and are respectively used for controlling the resonance wavelength of each micro-ring and regulating and controlling the coupling coefficient of the adjustable coupling areas.
4. A reconfigurable integrated microwave photonic band pass filter according to claim 3, wherein the tunable coupling region comprises: two curved coupled waveguide arms (217) and equal length waveguides (219) on the two curved coupled waveguide arms (217).
5. A reconfigurable integrated microwave photonic band-pass filter according to claim 4, characterized in that the optical phase shifters (216) are heating electrodes, PN junctions, optical power.
6. A reconfigurable integrated microwave photonic band-pass filter according to claim 5, characterized in that the integrated multistage cascaded second-order microring filter (17) is made of: silicon, silicon nitride, silicon oxynitride, silicon oxide, silicon dioxide, or an organic polymer.
7. A reconfigurable integrated microwave photonic band-pass filter according to claim 6, characterized in that the integrated multistage cascaded second-order microring filter (17) is a strip waveguide, a ridge waveguide, a slit waveguide or a surface plasmon waveguide.
8. A reconfigurable integrated microwave photonic band pass filter according to claim 7, wherein the microwave optical signal generation module comprises:
the radio frequency signal receiving antenna (16) is used for outputting radio frequency microwave signals with different microwave frequencies as modulation signals;
and the electro-optical modulator (15) is used for modulating one path of light beam output by the optical beam splitter (12) and a modulation signal output by the radio-frequency signal receiving antenna (16) to generate a microwave optical signal.
9. A reconfigurable integrated microwave photonic band pass filter according to claim 8, wherein the microwave electrical signal receiving module comprises:
the photoelectric detector (20) is used for converting the combined microwave optical signal into a microwave electric signal;
a radio frequency signal transmitting antenna (19) for receiving the microwave signal.
10. A reconfigurable integrated microwave photonic band pass filter according to any of claims 1-9, further comprising:
the first polarization controller (13) is used for controlling the polarization direction of one path of light beam output by the optical beam splitter (12) to be consistent with the polarization direction of the electro-optical modulator (15);
and the second polarization controller (14) is used for controlling the polarization direction of the other path of light beam output by the optical beam splitter (12) to be consistent with the polarization direction of the microwave optical signal processed by the integrated multistage cascade second-order micro-ring filter (17).
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114337842A (en) * | 2021-11-26 | 2022-04-12 | 军事科学院***工程研究院网络信息研究所 | Polarization programmable multifunctional microwave photon signal processing method |
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| CN114337842A (en) * | 2021-11-26 | 2022-04-12 | 军事科学院***工程研究院网络信息研究所 | Polarization programmable multifunctional microwave photon signal processing method |
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| CN114389704A (en) * | 2021-12-15 | 2022-04-22 | 光子集成(温州)创新研究院 | Microwave photonic filter based on MZI-MRR structure |
| CN114389704B (en) * | 2021-12-15 | 2023-10-20 | 光子集成(温州)创新研究院 | Microwave photon filter based on MZI-MRR structure |
| CN114826412A (en) * | 2022-03-09 | 2022-07-29 | 清华大学 | Reconfigurable rectangular microwave photon filter and filtering method |
| WO2024087863A1 (en) * | 2022-10-24 | 2024-05-02 | 中兴通讯股份有限公司 | Multi-channel frequency-hopping transmitting device, multi-channel frequency-hopping receiving device, multi-channel frequency-hopping communication method, and storage medium |
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