Wireless signal generation device and method based on integrated optical comb synchronization

Abstract

The invention provides a wireless signal generation device and method based on integrated optical comb synchronization. The device comprises an integrated optical comb repetition frequency signal generation unit which generates an optical comb signal, filters the optical comb signal to obtain a first optical signal and a second optical signal which are adjacent in wave beam, and a third optical signal and a fourth optical signal which are different in frequency, and performs beam combination, amplification and beat frequency on the first optical signal and the second optical signal to obtain an integrated optical comb repetition frequency signal; the frequency of the high-frequency clock signal is the same as that of the optical comb signal; the standard microwave clock signal generation unit is used for amplifying and filtering the high-frequency clock signal and then sequentially performing integer frequency division and fractional frequency division to obtain a microwave clock signal with standard frequency and synchronous with the high-frequency clock signal; and the wireless signal generation unit is used for converting the microwave clock signal into a low-frequency baseband signal, carrying out single-sideband modulation on the fourth optical signal through the low-frequency baseband signal to generate an optical carrier microwave signal, and carrying out beam combination and frequency beating on the optical carrier microwave signal and the third optical signal to obtain a high-frequency coherent wireless signal.

Description

Technical Field

[0001] The present invention relates to the fields of wireless communication and sensing imaging, and particularly to a wireless signal generation device and method based on integrated optical comb synchronization. Background Art

[0002] In the future, 6G networks will provide extremely high-speed data transmission exceeding 1 Tbps per second, which is dozens of times faster than the existing 5G technology, meeting the requirements of high-traffic applications such as AR, VR, tactile Internet, and holographic experiences. At the same time, 6G also needs to achieve sensing technology with centimeter-level accuracy to support applications in fields such as extended reality, intelligent transportation, and healthcare.

[0003] However, traditional electronic wireless communication systems are limited by electronic bottlenecks, with limited operating frequencies and bandwidths. Photonic-assisted technologies, especially photonic up-conversion technologies, with their ultra-wideband millimeter-wave and terahertz signal processing capabilities, have opened up new directions for high-frequency communication and radar systems. Optical comb technology has achieved remarkable results in the fields of wireless sensing and communication, but existing electro-optical comb systems rely on high-frequency microwave sources and are costly.

[0004] With the progress of micro-nano processing technology, the generation and regulation of new optical comb systems have brought possibilities for miniaturized and low-power integrated optical comb systems, which have obvious advantages in photonic-assisted wireless communication sensing systems. However, to achieve clock synchronization between the optical comb system and the electronic system, technical problems such as complex traditional electrical locking architectures and difficult operations still need to be solved. Summary of the Invention

[0005] In view of the above problems, the present invention provides a wireless signal generation device and method based on integrated optical comb synchronization, which are used to at least partially solve the above technical problems.

[0006] The first aspect of the present invention provides a wireless signal generation device based on integrated optical comb synchronization, including: an integrated optical comb repetition frequency signal generation unit, configured to generate an optical comb signal, filter the optical comb signal to obtain a first single-frequency optical signal and a second single-frequency optical signal with adjacent beams, and a third single-frequency optical signal and a fourth single-frequency optical signal with different frequencies, combine, amplify, and beat the first single-frequency optical signal and the second single-frequency optical signal to obtain a high-frequency clock signal with the same frequency as the optical comb signal; a standard microwave clock signal generation unit, configured to amplify and filter the high-frequency clock signal, and then successively perform integer frequency division and fractional frequency division to obtain a microwave clock signal with a standard frequency and synchronized with the high-frequency clock signal; a wireless signal generation unit, configured to convert the microwave clock signal into a low-frequency baseband signal, perform single-sideband modulation on the fourth single-frequency optical signal through the low-frequency baseband signal to generate an optical carrier microwave signal, combine and beat the optical carrier microwave signal and the third single-frequency optical signal to obtain a high-frequency coherent wireless signal.

[0007] According to an embodiment of the present invention, the integrated optical comb repetition frequency signal generation unit includes a distributed feedback laser, a high-quality factor silicon nitride micro-ring, a multi-channel tunable optical filter, a first optical coupler, a first optical amplifier, and a first optical detector connected in sequence, where: the distributed feedback laser generates pump light, and the pump light is self-injected and locked into the high-quality factor silicon nitride micro-ring to generate an optical comb signal; the multi-channel tunable optical filter filters the optical comb signal and selects comb teeth to obtain a first single-frequency optical signal and a second single-frequency optical signal with adjacent beams, as well as a third single-frequency optical signal and a fourth single-frequency optical signal with different frequencies; the first optical coupler combines the first single-frequency optical signal and the second single-frequency optical signal to obtain a first combined signal, and the first combined signal enters the first optical detector after being amplified by the first optical amplifier to obtain a high-frequency clock signal with the same frequency as the optical comb signal.

[0008] According to an embodiment of the present invention, the distributed feedback laser and the high-quality factor silicon nitride micro-ring are integrated on the same optical chip.

[0009] According to an embodiment of the present invention, the standard microwave clock signal generation unit includes a radio frequency amplifier, a radio frequency filter, a radio frequency integer divider, and a radio frequency fractional divider connected in sequence, where: the radio frequency amplifier amplifies the power of the high-frequency clock signal, and the amplified high-frequency clock signal is filtered by the radio frequency filter and then undergoes integer division by the radio frequency integer divider to obtain a low-frequency signal with a frequency of one Nth of the high-frequency clock signal, where N is a positive integer; the low-frequency signal is frequency-converted to a microwave clock signal with a standard frequency by the radio frequency fractional divider.

[0010] According to an embodiment of the present invention, the wireless signal generation unit includes: a first optical polarization controller and a second optical polarization controller, which are respectively used to control the polarization states of the third single-frequency optical signal and the fourth single-frequency optical signal; a second optical amplifier and a third optical amplifier, which are respectively used to amplify the power of the third single-frequency optical signal and the fourth single-frequency optical signal after polarization control; an arbitrary waveform generator, a radio frequency bridge, a single-sideband modulation module, a second optical coupler, and a second optical detector connected in sequence, where: the arbitrary waveform generator generates a low-frequency baseband signal based on the received microwave clock signal; the low-frequency baseband signal is split into two electrical signals by the radio frequency bridge; the single-sideband modulation module performs carrier-suppressed single-sideband modulation on the fourth single-frequency optical signal with amplified power through the two electrical signals to obtain an optical carrier microwave signal; the second optical coupler combines the optical carrier microwave signal and the third single-frequency optical signal with amplified power to obtain a second combined signal, and the second combined signal enters the second optical detector for power detection to obtain a wireless signal.

[0011] According to an embodiment of the present invention, the radio frequency bridge is a radio frequency 90° bridge, which is used to split the low-frequency baseband signal into a first electrical signal and a second electrical signal with a phase difference of 90°.

[0012] According to an embodiment of the present invention, the standard frequency is 10 MHz or 100 MHz.

[0013] A second aspect of the present invention provides a method for generating a wireless signal based on integrated optical comb synchronization, including: generating an optical comb signal, filtering the optical comb signal to obtain a first single-frequency optical signal and a second single-frequency optical signal with adjacent beams, and a third single-frequency optical signal and a fourth single-frequency optical signal with different frequencies, combining, amplifying, and beating the first single-frequency optical signal and the second single-frequency optical signal to obtain a high-frequency clock signal with the same frequency as the optical comb signal; after amplifying and filtering the high-frequency clock signal, successively passing through integer frequency division and fractional frequency division to obtain a microwave clock signal with a standard frequency and synchronized with the high-frequency clock signal; converting the microwave clock signal into a low-frequency baseband signal, performing single-sideband modulation on the fourth single-frequency optical signal through the low-frequency baseband signal to generate an optical carrier microwave signal, combining and beating the optical carrier microwave signal and the third single-frequency optical signal to obtain a high-frequency coherent wireless signal.

[0014] According to an embodiment of the present invention, generating the optical comb signal includes: generating pump light through a distributed feedback laser, self-injecting and locking the pump light into a high-quality factor silicon nitride micro-ring to generate an optical comb signal, wherein the distributed feedback laser and the high-quality factor silicon nitride micro-ring are integrated on the same optical chip.

[0015] According to an embodiment of the present invention, performing single-sideband modulation on the fourth single-frequency optical signal through the low-frequency baseband signal to generate an optical carrier microwave signal, combining and beating the optical carrier microwave signal and the third single-frequency optical signal to obtain a high-frequency coherent wireless signal, includes: controlling the polarization states of the third single-frequency optical signal and the fourth single-frequency optical signal respectively through a first optical polarization controller and a second optical polarization controller; respectively performing power amplification on the polarization-controlled third single-frequency optical signal and fourth single-frequency optical signal through a second optical amplifier and a third optical amplifier; splitting the low-frequency baseband signal into two electrical signals through a radio frequency bridge; performing carrier-suppressed single-sideband modulation on the power-amplified fourth single-frequency optical signal according to the two electrical signals through a single-sideband modulation module to obtain an optical carrier microwave signal; combining the optical carrier microwave signal and the power-amplified third single-frequency optical signal through a second optical coupler to obtain a second combined signal.

[0016] Compared with the prior art, the wireless signal generating device and method based on integrated optical comb synchronization provided by the present invention have at least the following technical effects:

[0017] (1) Using an on-chip distributed feedback laser and an on-chip high-quality factor silicon nitride micro-ring to generate an optical comb signal, the light source has high integration; utilizing the principle of self-injection locking to narrow the linewidth, a high-quality microcavity optical comb is obtained.

[0018] (2) The scheme of dividing the high-frequency clock signal with the same frequency as the optical comb signal into the standard microwave clock frequency and using it as the synchronization clock of the entire optoelectronic system. Since the high-frequency clock signal has great potential in achieving ultra-low phase noise performance, using it as the clock signal can improve the overall parameter level of the optoelectronic system.

[0019] (3) By utilizing the high coherence of the optical comb teeth and the carrier suppression single-sideband modulation of the IQ modulator, the tunability of the output electrical signal is ensured, and the tuning of various signals (such as single-frequency signals, Chirp signals, QPSK signals, etc.) can be achieved.

[0020] (4) The device link structure is simple and easy to operate, reducing the hardware complexity, and at the same time being easy to miniaturize and integrate. Description of the Drawings

[0021] Through the following description of the embodiments of the present invention with reference to the drawings, the above and other objects, features, and advantages of the present invention will become clearer. In the drawings:

[0022] Figure 1 Schematically shows the structural diagram of a wireless signal generation device based on integrated optical comb synchronization according to an embodiment of the present invention;

[0023] Figure 2 Schematically shows the flowchart of a wireless signal generation method based on integrated optical comb synchronization according to an embodiment of the present invention.

[0024] Description of the Reference Numerals:

[0025] OC - optical comb signal; OC1 - first single-frequency optical signal; OC2 - second single-frequency optical signal; OC3 - third single-frequency optical signal; OC4 - fourth single-frequency optical signal; OC12 - first combined signal; E - high-frequency clock signal; E2 - low-frequency signal; Ref - microwave clock signal; IF - low-frequency baseband signal; IF1 - first electrical signal; IF2 - second electrical signal; OC5 - optical carrier microwave signal; OC35 - second combined signal; ET - wireless signal. Detailed Embodiments

[0026] To make the objectives, technical solutions, and advantages of the present invention clearer and more understandable, the following further describes the present invention in detail with reference to specific embodiments and the accompanying drawings. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0027] The terms used herein are merely for describing specific embodiments and are not intended to limit the present invention. The terms "including", "comprising", etc. used herein indicate the presence of the described features, steps, operations, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, or components.

[0028] All terms used herein (including technical and scientific terms) have the meanings commonly understood by those skilled in the art, unless otherwise defined. It should be noted that the terms used herein should be interpreted as having a meaning consistent with the context of this specification and should not be interpreted in an idealized or overly rigid manner.

[0029] Figure 1 The structural diagram of a wireless signal generation device based on integrated optical comb synchronization according to an embodiment of the present invention is schematically shown.

[0030] As Figure 1 shown, the wireless signal generation device based on integrated optical comb synchronization of this embodiment includes:

[0031] An integrated optical comb repetition frequency signal generation unit for generating an optical comb signal OC, filtering the optical comb signal OC to obtain a first single-frequency optical signal OC1 and a second single-frequency optical signal OC2 with adjacent beams, and a third single-frequency optical signal OC3 and a fourth single-frequency optical signal OC4 with different frequencies, combining, amplifying, and beating the first single-frequency optical signal OC1 and the second single-frequency optical signal OC2 to obtain a high-frequency clock signal E having the same frequency as the optical comb signal OC;

[0032] A standard microwave clock signal generation unit for successively performing integer division and fractional division on the high-frequency clock signal E after amplification and filtering to obtain a microwave clock signal Ref having a standard frequency and synchronized with the high-frequency clock signal E;

[0033] A wireless signal generation unit for converting the microwave clock signal Ref into a low-frequency baseband signal IF, performing single-sideband modulation on the fourth single-frequency optical signal OC4 through the low-frequency baseband signal IF to generate an optically carried microwave signal OC5, and combining and beating the optically carried microwave signal OC5 and the third single-frequency optical signal OC3 to obtain a high-frequency coherent wireless signal ET.

[0034] The following will be based on Figure 1 the structure to describe in detail the integrated optical comb repetition frequency signal generation unit, the standard microwave clock signal generation unit, and the wireless signal generation unit therein.

[0035] In this embodiment, the integrated optical comb repetition frequency signal generation unit includes a distributed feedback laser, a high-quality factor (Q-value) silicon nitride micro-ring, a multi-channel tunable optical filter, a first optical coupler, a first optical amplifier, and a first photodetector connected in sequence, wherein:

[0036] The distributed feedback laser generates pump light, and the pump light is self-injected and locked into a high-quality factor silicon nitride micro-ring to generate an optical comb signal OC;

[0037] The multi-channel tunable optical filter filters the optical comb signal OC and selects the teeth of the comb to obtain the first single-frequency optical signal OC1 and the second single-frequency optical signal OC2 with adjacent beams, as well as the third single-frequency optical signal OC3 and the fourth single-frequency optical signal OC4 with different frequencies;

[0038] The first optical coupler combines the first single-frequency optical signal OC1 and the second single-frequency optical signal OC2 to obtain a first combined signal OC12. The first combined signal OC12 is amplified by the first optical amplifier and then enters the first optical detector, and a high-frequency clock signal E with the same frequency as the optical comb signal OC is obtained at the output end of the first optical detector.

[0039] Preferably, the distributed feedback laser and the high-quality factor silicon nitride micro-ring are integrated on the same optical chip. That is to say, the distributed feedback laser can be an on-chip distributed feedback laser, and the high-quality factor silicon nitride micro-ring can be an on-chip high-quality factor silicon nitride micro-ring.

[0040] It can be understood that the high-quality factor silicon nitride micro-ring can provide accumulated backward Rayleigh scattering optical feedback. By hybrid integrating it with a distributed feedback semiconductor laser, an optical comb signal OC can be obtained, which is a high-integration self-injected locking on-chip narrow linewidth light source. Thus, the integration can be improved, which is applicable to fields such as high-speed communication and optical sensing.

[0041] In this way, the integrated optical comb repetition frequency signal generation unit can generate the repetition frequency signal of the integrated optical comb, which is used as the high-frequency clock signal E. Among them, the third single-frequency optical signal OC3 and the fourth single-frequency optical signal OC4 enter the wireless signal generation unit and are used as the optical carriers for providing beat frequency to generate high-frequency wireless signals.

[0042] In this embodiment, the standard microwave clock signal generation unit includes a radio frequency amplifier, a radio frequency filter, a radio frequency integer divider, and a radio frequency fractional divider connected in sequence, where:

[0043] The radio frequency amplifier amplifies the power of the high-frequency clock signal E. After the amplified high-frequency clock signal E is filtered by the radio frequency filter, it is integer-divided by the radio frequency integer divider to obtain a low-frequency signal E2 with a frequency of one Nth of the high-frequency clock signal, where N is a positive integer;

[0044] The radio frequency fractional divider frequency-converts the low-frequency signal E2 into a microwave clock signal Ref with a standard frequency.

[0045] For example, a radio frequency amplifier is connected to the output terminal of the first photodetector of the integrated optical comb repetition frequency signal generation unit, and can amplify the power of the high-frequency clock signal E. The radio frequency filter filters the amplified high-frequency clock signal E to make it purer.

[0046] For example, the standard frequency is 10 MHz or 100 MHz. Thus, the radio frequency fractional divider can convert the low-frequency signal E2 into a microwave clock signal Ref with a standard frequency of 10 MHz or 100 MHz.

[0047] In this way, the standard microwave clock signal generation unit can generate a microwave clock signal Ref with a standard frequency, and the microwave clock signal Ref is synchronized with the high-frequency clock signal E.

[0048] In this embodiment, the wireless signal generation unit includes:

[0049] A first optical polarization controller and a second optical polarization controller, which are respectively used to control the polarization states of the third single-frequency optical signal OC3 and the fourth single-frequency optical signal OC4;

[0050] A second optical amplifier and a third optical amplifier, which are respectively used to amplify the power of the polarization-controlled third single-frequency optical signal OC3 and the fourth single-frequency optical signal OC4;

[0051] An arbitrary waveform generator, a radio frequency bridge, a single-sideband modulation module, a second optical coupler, and a second photodetector connected in sequence, wherein the second optical amplifier is connected to the second optical coupler, and the third optical amplifier is connected to the single-sideband modulation module:

[0052] The arbitrary waveform generator generates a low-frequency baseband signal IF based on the received microwave clock signal Ref;

[0053] The low-frequency baseband signal IF is split into two electrical signals by the radio frequency bridge;

[0054] The single-sideband modulation module performs carrier-suppressed single-sideband modulation on the polarization-controlled fourth single-frequency optical signal OC4 through the two electrical signals to obtain an optical carrier microwave signal OC5;

[0055] The second optical coupler combines the optical carrier microwave signal OC5 and the polarization-controlled third single-frequency optical signal OC3 to obtain a second combined signal OC35, and the second combined signal OC35 enters the second photodetector, and a high-frequency coherent wireless signal ET is obtained at the output terminal of the second photodetector.

[0056] For example, the first optical polarization controller and the second optical polarization controller are respectively connected to the output terminal of the multi-channel tunable optical filter of the integrated optical comb repetition frequency signal generation unit to respectively control the polarization states of the third single-frequency optical signal OC3 and the fourth single-frequency optical signal OC4,

[0057] For example, an arbitrary waveform generator is connected to the output of the radio frequency fractional divider of the standard microwave clock signal generation unit to receive the microwave clock signal Ref, achieve synchronization with the optical comb signal OC, and use the microwave clock signal Ref as an external reference to generate a low-frequency baseband signal IF.

[0058] For example, the radio frequency bridge is a radio frequency 90° bridge, which can split the low-frequency baseband signal IF into a first electrical signal IF1 and a second electrical signal IF2 with a 90° phase difference. The single-sideband modulation module can perform carrier-suppressed single-sideband modulation on the polarization-controlled fourth single-frequency optical signal OC4 through the first electrical signal IF1 and the second electrical signal IF2 to achieve the loading of the low-frequency baseband signal IF and obtain an optically carried microwave signal OC5.

[0059] In this way, the wireless signal generation unit can generate a high-frequency coherent wireless signal ET.

[0060] Based on this, the wireless signal generation device based on integrated optical comb synchronization provided by the embodiments of the present invention can organically combine the integrated optical comb technology with the wireless communication sensing system to meet the requirements of high-speed communication and high positioning accuracy perception in the 6G network. The wireless communication sensing system based on the integrated optical comb generates coherent signals, which is a low-cost, low-resource-consuming, and clock-synchronized wireless signal generation device and method.

[0061] Based on the same technical concept, the present invention also provides a wireless signal generation method based on integrated optical comb synchronization.

[0062] Figure 2 The flowchart of the wireless signal generation method based on integrated optical comb synchronization according to the embodiments of the present invention is schematically shown.

[0063] As Figure 2 shown, the wireless signal generation method based on integrated optical comb synchronization in this embodiment may include step S1 to step S3.

[0064] Step S1, generate an optical comb signal OC, filter the optical comb signal OC to obtain a first single-frequency optical signal OC1 and a second single-frequency optical signal OC2 with adjacent beams, and a third single-frequency optical signal OC3 and a fourth single-frequency optical signal OC4 with different frequencies. Combine, amplify, and beat the first single-frequency optical signal OC1 and the second single-frequency optical signal OC2 to obtain a high-frequency clock signal E with the same frequency as the optical comb signal OC.

[0065] This step can be executed by the integrated optical comb repetition frequency signal generation unit. Specifically, a pump light can be generated by a distributed feedback laser, and the pump light is self-injected and locked into a high-quality factor silicon nitride micro-ring to generate an optical comb signal OC, where the distributed feedback laser and the high-quality factor silicon nitride micro-ring are integrated on the same optical chip.

[0066] An optical comb signal OC can be input into a multi-channel tunable optical filter for filtering and comb tooth selection. Among them, the first single-frequency optical signal OC1 and the second single-frequency optical signal OC2 adjacent to two beams are selected and output from two channels respectively; the third single-frequency optical signal OC3 and the fourth single-frequency optical signal OC4 with different frequencies are also selected simultaneously as the optical carriers for providing beat frequency to generate high-frequency wireless signals.

[0067] The first single-frequency optical signal OC1 and the second single-frequency optical signal OC2 are combined by a first optical coupler, and then amplified by a first optical amplifier and enter a first optical detector, and a high-frequency clock signal E is obtained at the output end of the first optical detector.

[0068] Step S2: After the high-frequency clock signal is amplified and filtered, it passes through integer frequency division and fractional frequency division in sequence to obtain a microwave clock signal with a standard frequency and synchronized with the high-frequency clock signal.

[0069] This step can be executed by a standard microwave clock signal generating unit. In the standard microwave clock signal generating unit, a radio frequency amplifier amplifies the power of the high-frequency clock signal E. After the amplified high-frequency clock signal E is filtered by a radio frequency filter, it is subjected to integer frequency division by a radio frequency integer frequency divider to obtain a low-frequency signal E2 with a frequency of one Nth of the high-frequency clock signal, where N is a positive integer.

[0070] The low-frequency signal E2 is frequency-converted to a standard 10 MHz or 100 MHz microwave clock signal Ref through a radio frequency fractional frequency divider.

[0071] Step S3: Convert the microwave clock signal into a low-frequency baseband signal, perform single-sideband modulation on the fourth single-frequency optical signal through the low-frequency baseband signal to generate an optical carrier microwave signal, and combine and beat the optical carrier microwave signal and the third single-frequency optical signal to obtain a high-frequency coherent wireless signal.

[0072] This step can be executed by a wireless signal generating unit. Specifically, in the wireless signal generating unit, the polarization states of the third single-frequency optical signal OC3 and the fourth single-frequency optical signal OC4 can be controlled by a first optical polarization controller and a second optical polarization controller respectively;

[0073] The third single-frequency optical signal OC3 and the fourth single-frequency optical signal OC4 after polarization control are respectively power-amplified by a second optical amplifier and a third optical amplifier;

[0074] The low-frequency baseband signal IF is split into a first electrical signal IF1 and a second electrical signal IF2 with a 90° phase difference through a radio frequency bridge;

[0075] Through the single-sideband modulation module, carrier-suppressed single-sideband modulation is performed on the fourth single-frequency optical signal OC4 after power amplification according to the first electrical signal IF1 and the second electrical signal IF2 to realize the loading of the low-frequency baseband signal IF, and an optical carrier microwave signal OC5 is obtained.

[0076] Through the second optical coupler, the optical carrier microwave signal OC5 and the third single-frequency optical signal OC3 after power amplification are combined to obtain a second combined signal OC35.

[0077] It should be noted that the implementation manners in the method part are correspondingly similar to those in the above-mentioned device part, and the achieved technical effects are also correspondingly similar. For specific details, please refer to the implementation manners in the above-mentioned device part, which will not be elaborated here.

[0078] In summary, the embodiments of the present invention provide a wireless signal generation device and method based on integrated optical comb synchronization. Facing the requirements of high-speed communication and high positioning accuracy perception in the 6G network, the integrated optical comb technology can be organically combined with the wireless communication perception system. The wireless communication perception system based on the integrated optical comb generates coherent signals, which is a wireless signal generation device and method with low cost, low resource consumption, and clock synchronization.

[0079] It can be seen from the above description that the above embodiments of the present invention at least achieve the following technical effects:

[0080] (1) An optical comb signal is generated using an on-chip distributed feedback laser and an on-chip high-quality factor silicon nitride micro-ring, with high light source integration; the principle of self-injection locking is used to narrow the linewidth, and a high-quality micro-cavity optical comb is obtained.

[0081] (2) The scheme of dividing the high-frequency clock signal with the same frequency as the optical comb signal into the standard microwave clock frequency and using it as the synchronization clock for the entire optoelectronic system. Since the high-frequency clock signal has great potential in achieving ultra-low phase noise performance, using it as the clock signal can improve the overall parameter level of the optoelectronic system.

[0082] (3) Utilizing the high coherence of the optical comb teeth and the carrier-suppressed single-sideband modulation of the IQ modulator ensures the tunability of the output electrical signal, and the tuning of various signals (such as single-frequency signals, Chirp signals, QPSK signals, etc.) can be achieved.

[0083] (4) The device link structure is simple and easy to operate, reducing the hardware complexity, and at the same time being easy to miniaturize and integrate.

[0084] It should be noted that in the drawings or the description of the specification, similar or identical parts are all assigned the same reference numerals. Implementations not depicted or described in the drawings are in forms known to those of ordinary skill in the relevant art. Additionally, although this document may provide examples of parameters containing specific values, it should be understood that the parameters do not necessarily have to be exactly equal to the corresponding values, but may approximate the corresponding values within acceptable error tolerances or design constraints.

[0085] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features.

[0086] Those skilled in the art can understand that the features described in the various embodiments of the present invention can be combined and / or combined in various ways, even if such combinations or combinations are not explicitly described in the present invention. In particular, without departing from the spirit and teachings of the present invention, the features described in the various embodiments of the present invention can be combined and / or combined in various ways. All such combinations and / or combinations fall within the scope of the present invention.

[0087] The above describes the embodiments of the present invention. However, these embodiments are for illustrative purposes only and are not intended to limit the scope of the present invention. Although the embodiments are described separately above, this does not mean that the measures in the respective embodiments cannot be used advantageously in combination. Without departing from the scope of the present invention, those skilled in the art can make various substitutions and modifications, and all such substitutions and modifications should fall within the scope of the present invention.

Claims

1. A wireless signal generating device based on integrated optical comb synchronization, characterized in that: include: An integrated optical comb repetition frequency signal generating unit is used to generate an optical comb signal, filter the optical comb signal to obtain a first single-frequency optical signal and a second single-frequency optical signal with adjacent beams, and a third single-frequency optical signal and a fourth single-frequency optical signal with different frequencies, and combine, amplify and beat the first single-frequency optical signal and the second single-frequency optical signal to obtain a high-frequency clock signal with the same frequency as the optical comb signal; A standard microwave clock signal generating unit, used to amplify and filter the high-frequency clock signal, and then perform integer frequency division and fractional frequency division in sequence to obtain a microwave clock signal with a standard frequency and synchronized with the high-frequency clock signal; The wireless signal generating unit is used to convert the microwave clock signal into a low-frequency baseband signal, perform single-sideband modulation on the fourth single-frequency optical signal through the low-frequency baseband signal to generate a light-carrying microwave signal, and combine and beat the light-carrying microwave signal with the third single-frequency optical signal to obtain a high-frequency coherent wireless signal.

2. The device according to claim 1, characterized in that The integrated optical comb repetition frequency signal generating unit comprises a distributed feedback laser, a high quality factor silicon nitride microring, a multi-channel tunable optical filter, a first optical coupler, a first optical amplifier and a first optical detector connected in sequence, wherein: The distributed feedback laser generates pump light, and the pump light is self-injected and locked into the high-quality factor silicon nitride microring to generate the optical comb signal; The multi-channel tunable optical filter filters and selects comb teeth of the optical comb signal to obtain a first single-frequency optical signal and a second single-frequency optical signal with adjacent beams, and a third single-frequency optical signal and a fourth single-frequency optical signal with different frequencies; The first optical coupler combines the first single-frequency optical signal and the second single-frequency optical signal to obtain a first combined signal. The first combined signal is amplified by the first optical amplifier and then enters the first optical detector to obtain a high-frequency clock signal with the same frequency as the optical comb signal.

3. The device according to claim 2, characterized in that The distributed feedback laser and the high quality factor silicon nitride microring are integrated on the same optical chip.

4. The device according to claim 1 or 2, characterized in that: The standard microwave clock signal generating unit comprises a radio frequency amplifier, a radio frequency filter, a radio frequency integer frequency divider and a radio frequency fractional frequency divider connected in sequence, wherein: The RF amplifier performs power amplification on the high-frequency clock signal. The amplified high-frequency clock signal is filtered by the RF filter and then integer-divided by the RF integer divider to obtain a low-frequency signal having a frequency of one N times the high-frequency clock signal, where N is a positive integer. The low frequency signal is converted into the microwave clock signal of standard frequency by the radio frequency fractional divider.

5. The device according to claim 1 or 2, characterized in that: The wireless signal generating unit comprises: A first optical polarization controller and a second optical polarization controller, respectively used to control the polarization states of the third single-frequency optical signal and the fourth single-frequency optical signal; The second optical amplifier and the third optical amplifier are used to power amplify the third single-frequency optical signal and the fourth single-frequency optical signal after polarization control, respectively; An arbitrary waveform generator, a radio frequency bridge, a single-sideband modulation module, a second optical coupler and a second optical detector are connected in sequence, wherein: The arbitrary waveform generator generates a low frequency baseband signal based on the received microwave clock signal; The low-frequency baseband signal is split into two beams of electrical signals through the radio frequency bridge; The single sideband modulation module performs carrier suppressed single sideband modulation on the power amplified fourth single frequency optical signal through the two electrical signals to obtain an optically carried microwave signal; The second optical coupler combines the optically-carried microwave signal and the power-amplified third single-frequency optical signal to obtain a second combined signal. The second combined signal enters the second optical detector for power detection to obtain the wireless signal.

6. The device according to claim 5, characterized in that The radio frequency bridge is a radio frequency 90° bridge, which is used to split the low-frequency baseband signal into a first electrical signal and a second electrical signal with a phase difference of 90°.

7. The device according to claim 1, characterized in that The standard frequency is 10 MHz or 100 MHz.

8. A wireless signal generation method based on integrated optical comb synchronization, characterized in that: include: generating an optical comb signal, filtering the optical comb signal to obtain a first single-frequency optical signal and a second single-frequency optical signal with adjacent beams, and a third single-frequency optical signal and a fourth single-frequency optical signal with different frequencies, and combining, amplifying and beating the first single-frequency optical signal and the second single-frequency optical signal to obtain a high-frequency clock signal with the same frequency as the optical comb signal; After amplifying and filtering the high-frequency clock signal, the high-frequency clock signal is divided by integer and fractional frequencies in sequence to obtain a microwave clock signal with a standard frequency and synchronized with the high-frequency clock signal; The microwave clock signal is converted into a low-frequency baseband signal, the fourth single-frequency optical signal is single-sideband modulated by the low-frequency baseband signal to generate an optically-carried microwave signal, and the optically-carried microwave signal and the third single-frequency optical signal are combined and frequency-beaten to obtain a high-frequency coherent wireless signal.

9. The method according to claim 8, characterized in that Generating an optical comb signal comprises: Pump light is generated by a distributed feedback laser, and the pump light is self-injected and locked into a high-quality factor silicon nitride microring to generate the optical comb signal, wherein the distributed feedback laser and the high-quality factor silicon nitride microring are integrated on the same optical chip.

10. The method according to claim 8, characterized in that The method of performing single-sideband modulation on the fourth single-frequency optical signal by using the low-frequency baseband signal to generate an optically-carried microwave signal, and combining and beating the optically-carried microwave signal with the third single-frequency optical signal to obtain a high-frequency coherent wireless signal includes: Controlling the polarization states of the third single-frequency optical signal and the fourth single-frequency optical signal respectively by means of a first optical polarization controller and a second optical polarization controller; Amplifying the power of the third single-frequency optical signal and the fourth single-frequency optical signal after polarization control by the second optical amplifier and the third optical amplifier respectively; Splitting the low-frequency baseband signal into two electrical signals through a radio frequency bridge; The fourth single-frequency optical signal after power amplification is subjected to carrier suppressed single-sideband modulation by a single-sideband modulation module according to the two electrical signals to obtain an optically-carried microwave signal; The optically-carried microwave signal and the power-amplified third single-frequency optical signal are combined by a second optical coupler to obtain a second combined signal.

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