An optoelectronic phase-locked loop, an electrical component, a laser ranging device, and an electronic device

Abstract

The present application discloses an optoelectronic phase-locked loop, which includes an optical component and an electrical component. The electrical component includes a multi-phase signal generator, a mixing circuit, a control circuit, and an integration driving circuit. The optical component converts a laser signal into an electrical signal. The multi-phase signal generator converts the electrical signal into an electrical signal with an initial phase and an electrical signal with an offset phase. The mixing circuit mixes the electrical signal with the initial phase with a first reference signal of a corresponding phase, and mixes the electrical signal with the offset phase with a second reference signal of a corresponding phase, and then superimposes the mixed signals to obtain a first output signal and a second output signal. The control circuit processes the first output signal and the second output signal to obtain a slope voltage signal. The integration driving circuit generates a driving signal according to the slope voltage signal to drive the laser signal to be emitted in the optical component. The present application can suppress high-order harmonics in the mixed signal and improve the linearity of the laser signal output by the laser.

Description

Technical Field

[0001] The present application relates to the field of optoelectronic technologies, and particularly to an electro-optical phase-locked loop, an electrical component, a laser ranging device, and an electronic device. Background Art

[0002] Frequency modulation continuous wave (FMCW) lidar, as a type of coherent lidar, can greatly improve the detection sensitivity of the lidar. Its detection principle is to utilize the characteristics of a linearly frequency-modulated signal, enabling the local oscillator signal and the echo signal to generate a beat frequency signal. Then, based on the frequency magnitude of the beat frequency signal, the distance information and velocity information of the object to be measured can be calculated.

[0003] The quality, i.e., linearity, of the linearly frequency-modulated signal is closely related to the accuracy of the measurement results of the FMCW lidar. Most of the laser signals of the FMCW lidar are generated by directly modulating a laser. The direct modulation scheme of the laser has serious nonlinear problems, reducing the linearity of the output signal. An electro-optical phase lock loop (EOPLL), as an efficient nonlinear compensation scheme for FMCW lidar signals, is widely adopted. The electro-optical phase lock loop uses an unbalanced Mach-Zehnder Interferometer (MZI) to perform self-heterodyne mixing on the signal output by the laser, uses a balanced photodetector to detect the optical signal after self-heterodyne mixing, converts the optical signal into an electrical signal, and then mixes the electrical signal and the reference signal respectively to obtain the error between the electrical signal and the reference signal, and feeds the error back into the drive signal of the laser to achieve the correction of the subsequent output signal of the laser, completing one round of feedback iteration; through continuous feedback iteration, the linearity of the laser signal output by the laser finally reaches an acceptable level.

[0004] The current electro-optical phase lock loop is affected by high-order harmonic components during the mixing process, thereby affecting the linearity of the laser signal emitted by the laser. Summary of the Invention

[0005] The present application provides an electro-optical phase lock loop that can reduce the influence of high-order harmonic components during the mixing process and improve the linearity of the laser signal emitted by the laser. The present application also provides an electrical component, a laser ranging device, and an electronic device applied to the electro-optical phase lock loop.

[0006] The first aspect of the present application provides an optoelectronic phase-locked loop, including: an optical component and an electrical component. The electrical component includes a multi-phase signal generator, a mixing circuit, a control circuit, and an integration driving circuit. The multi-phase signal generator is connected to the optical component, and the multi-phase signal generator, the mixing circuit, the control circuit, and the integration driving circuit are connected in sequence. The integration driving circuit is connected to the optical component.

[0007] The optical component is used to convert a laser signal into an electrical signal.

[0008] The multi-phase signal generator is used to convert an electrical signal into electrical signals with 4 different initial phases, and generate at least one set of 4 offset-phase electrical signals with the same phase offset according to the 4 electrical signals with different initial phases. The 4 different initial phases are evenly distributed between 0° and 360°. When there are at least two sets of offset-phase electrical signals, the phase offset of the electrical signals in the same set is the same, and the phase offsets of the electrical signals in different sets are different.

[0009] The mixing circuit is used to mix the 4 electrical signals with different initial phases and the first reference signals with corresponding phases respectively to obtain 4 initial mixing signals, and mix the offset-phase electrical signals of each group and the second reference signals with corresponding phases respectively to obtain at least one set of offset mixing signals. Each set of offset mixing signals includes 4 offset mixing signals. The initial mixing signals obtained by mixing the electrical signals with the initial phases in the first phase space and the offset mixing signals obtained by mixing the electrical signals with the offset phases in the first phase space are superimposed to obtain a first output signal. The initial mixing signals obtained by mixing the electrical signals with the initial phases in the second phase space and the offset mixing signals obtained by mixing the electrical signals with the offset phases in the second phase space are superimposed to obtain a second output signal. The union of the first phase space and the second phase space is 0° to 360°, and the intersection is empty.

[0010] The control circuit is used to process the first output signal and the second output signal to obtain a slope voltage signal.

[0011] The integration driving circuit is used to generate a driving signal according to the slope voltage signal, and the driving signal is used to drive the laser signal to be emitted in the optical component.

[0012] In the present application, the optoelectronic phase-locked loop is a feedback circuit that corrects the driving signal of the optical signal through the electrical signal after optoelectronic conversion, so that the laser emits a laser signal with linearity meeting the requirements. The optoelectronic phase-locked loop generally includes an optical component and an electrical component, and the optical component and the electrical component form a loop. The components in the optical component are used to emit a laser signal, and after processing the laser signal, convert the optical signal into an electrical signal. The components in the electrical component process the electrical signal received from the optical component, and then correct the driving signal for driving the laser signal.

[0013] In this application, the initial phase is relative to the offset phase. The electrical signal of the offset phase can be obtained by vector addition on the electrical signal of the initial phase. By adding the same offset phase amount to each initial phase, a set of electrical signals of the offset phase can be obtained. The phase offset amounts added to different groups are different. When there are two or more sets of electrical signals of the offset phase, the phase offset amount of each set is usually evenly distributed between 0° and 90°.

[0014] In this application, usually two or more mixers are connected in parallel in the mixing circuit. The mixers connected in parallel can be four-phase mixers, or a combination of two-phase mixers and four-phase mixers, or eight-phase mixers, or a combination of four-phase mixers and eight-phase mixers. Of course, it can also be a combination of other different types of mixers.

[0015] In this application, the "corresponding phase" can be understood as the same phase. For example: the initial signal of 0° is mixed with the first reference signal of 0°, the initial signal of 90° is mixed with the first reference signal of 90°, the initial signal of 180° is mixed with the first reference signal of 180°, and the initial signal of 270° is mixed with the first reference signal of 270°. The mixing process of the electrical signal of the offset phase and the second reference signal can also be understood by referring to the explanation here.

[0016] In this first aspect, when mixing, an electrical signal of an offset phase with a phase offset from the electrical signal of the initial phase is introduced. In this way, by superimposing the mixing signal of the electrical signal of the offset phase and the mixing signal of the electrical signal of the initial phase, the high-order harmonics in the electrical signal after mixing can be well suppressed, the ability of the optoelectronic phase-locked loop is improved, and the linearity of the laser signal output by the laser is also enhanced.

[0017] In a possible implementation manner of the first aspect, the mixing circuit includes a first four-phase mixer, a second four-phase mixer, a first adder, and a second adder. The first four-phase mixer and the second four-phase mixer are connected in parallel, and the first adder and the second adder are respectively connected to the first four-phase mixer and the second four-phase mixer. There is one set of electrical signals of the offset phase.

[0018] The first four-phase mixer is used to mix and superimpose the two electrical signals of the initial phase located in the first phase space, and to mix and superimpose the two electrical signals of the initial phase located in the second phase space.

[0019] The second four-phase mixer is used to mix and superimpose the two electrical signals of the offset phase located in the first phase space, and to mix and superimpose the two electrical signals of the offset phase located in the second phase space.

[0020] The first adder superimposes the signal obtained by mixing and superimposing the electrical signal of the initial phase in the first phase space and the signal obtained by mixing and superimposing the electrical signal of the offset phase in the first phase space, so as to obtain the first output signal.

[0021] The second adder superimposes the signal obtained by mixing and superimposing the electrical signal of the initial phase in the second phase space and the signal obtained by mixing and superimposing the electrical signal of the offset phase in the second phase space, so as to obtain the second output signal.

[0022] In this possible implementation, two quadrature mixers are connected in parallel in the mixing circuit. In this way, the electrical signal of the initial phase can be mixed by one quadrature mixer, and the electrical signal of the offset phase can be mixed by the other quadrature mixer. Then, the signals output by these two quadrature mixers are superimposed, which can well suppress the high-order harmonics in the mixed electrical signal output by the first quadrature mixer.

[0023] In a possible implementation of the first aspect, the four different initial phases are 0°, 90°, 180°, and 270° respectively, the phase offset of the electrical signal of the offset phase is 45°, and the offset phases corresponding to each initial phase are 45°, 135°, 225°, and 315° respectively.

[0024] The first quadrature mixer is used to mix the four-way electrical signals of 0°, 90°, 180°, and 270° with the four-way first reference signals of 0°, 90°, 180°, and 270° respectively, and superimpose the electrical signal after mixing 0° and the electrical signal after mixing 90° to obtain the first superimposed signal, and superimpose the electrical signal after mixing 180° and the electrical signal after mixing 270° to obtain the second superimposed signal.

[0025] The second quadrature mixer is used to mix the four-way electrical signals of 45°, 135°, 225°, and 315° with the four-way second reference signals of 45°, 135°, 225°, and 315° respectively, and superimpose the electrical signal after mixing 45° and the electrical signal after mixing 135° to obtain the third superimposed signal, and superimpose the electrical signal after mixing 225° and the electrical signal after mixing 315° to obtain the fourth superimposed signal.

[0026] The first adder is used to superimpose the first superimposed signal and the third superimposed signal to obtain the first output signal.

[0027] The second adder is used to superimpose the second superimposed signal and the fourth superimposed signal to obtain the second output signal.

[0028] In this possible implementation, by performing mixing processing on the determined electrical signals of four initial phases and the electrical signals of four offset phases respectively, the high-order harmonics in the mixed electrical signals output by the first quadrature mixer are well suppressed.

[0029] In a possible implementation of the first aspect, the mixing circuit includes a first quadrature mixer, a second quadrature mixer, a third quadrature mixer, a fourth quadrature mixer, a first adder, and a second adder connected in parallel. The first quadrature mixer, the second quadrature mixer, the third quadrature mixer, and the fourth quadrature mixer are connected in parallel, and the first adder and the second adder are respectively connected to the first quadrature mixer, the second quadrature mixer, the third quadrature mixer, and the fourth quadrature mixer. There are three groups of electrical signals with offset phases.

[0030] The first quadrature mixer is used to mix and superimpose the electrical signals of two initial phases located in the first phase space, and to mix and superimpose the electrical signals of two initial phases located in the second phase space.

[0031] The second quadrature mixer is used to mix and superimpose the electrical signals of two offset phases located in the first phase space in the first group of offset-phase electrical signals among the three groups, and to mix and superimpose the electrical signals of two offset phases located in the second phase space.

[0032] The third quadrature mixer is used to mix and superimpose the electrical signals of two offset phases located in the first phase space in the second group of offset-phase electrical signals among the three groups, and to mix and superimpose the electrical signals of two offset phases located in the second phase space.

[0033] The fourth quadrature mixer is used to mix and superimpose the electrical signals of two offset phases located in the first phase space in the third group of offset-phase electrical signals among the three groups, and to mix and superimpose the electrical signals of two offset phases located in the second phase space.

[0034] The first adder superimposes the signal obtained by mixing and superimposing the electrical signals of the initial phase located in the first phase space with the signals obtained by mixing and superimposing the electrical signals of the offset phase located in the first phase space in each group among the three groups to obtain a first output signal.

[0035] The second adder superimposes the signal obtained by mixing and superimposing the electrical signals of the initial phase located in the second phase space with the signals obtained by mixing and superimposing the electrical signals of the offset phase located in the second phase space in each group among the three groups to obtain a second output signal.

[0036] In this possible implementation, four quadrature mixers are connected in parallel in the mixing circuit. In this way, an electrical signal with an initial phase can be mixed by one quadrature mixer, and electrical signals with different offset phases can be mixed by the other three quadrature mixers. Then, the signals output by these four quadrature mixers are superimposed, which can effectively suppress the high-order harmonics in the mixed electrical signal output by the first quadrature mixer.

[0037] In a possible implementation of the first aspect, the four different initial phases are 0°, 90°, 180°, and 270° respectively, and the phase offset amounts in each of the three groups are 22.5°, 45°, and 67.5° respectively; the three offset phases corresponding to each initial phase are 22.5°, 112.5°, 202.5°, and 292.5°, 45°, 135°, 225°, and 315°, and 67.5°, 157.5°, 247.5°, and 337.5°.

[0038] The first quadrature mixer is used to mix four electrical signals of 0°, 90°, 180°, and 270° with four first reference signals of 0°, 90°, 180°, and 270° respectively, and superimpose the electrical signal mixed at 0° and the electrical signal mixed at 90° to obtain a first superimposed signal, and superimpose the electrical signal mixed at 180° and the electrical signal mixed at 270° to obtain a second superimposed signal.

[0039] The second quadrature mixer is used to mix four electrical signals of 45°, 135°, 225°, and 315° with four second reference signals of 45°, 135°, 225°, and 315° respectively, and superimpose the electrical signal mixed at 45° and the electrical signal mixed at 135° to obtain a third superimposed signal, and superimpose the electrical signal mixed at 225° and the electrical signal mixed at 315° to obtain a fourth superimposed signal.

[0040] The third quadrature mixer is used to mix four electrical signals of 22.5°, 112.5°, 202.5°, and 292.5° with four second reference signals of 22.5°, 112.5°, 202.5°, and 292.5° respectively, and superimpose the electrical signal mixed at 22.5° and the electrical signal mixed at 112.5° to obtain a fifth superimposed signal, and superimpose the electrical signal mixed at 202.5° and the electrical signal mixed at 292.5° to obtain a sixth superimposed signal.

[0041] The fourth four-phase mixer is used to mix four electrical signals of 67.5°, 157.5°, 247.5°, and 337.5° with four second reference signals of 67.5°, 157.5°, 247.5°, and 337.5° that correspond one by one respectively, and superimpose the electrical signal after mixing at 67.5° and the electrical signal after mixing at 157.5° to obtain a seventh superimposed signal, and superimpose the electrical signal after mixing at 247.5° and the electrical signal after mixing at 337.5° to obtain an eighth superimposed signal.

[0042] The first adder is used to superimpose the first superimposed signal, the third superimposed signal, the fifth superimposed signal, and the seventh superimposed signal to obtain a first output signal.

[0043] The second adder is used to superimpose the second superimposed signal, the fourth superimposed signal, the sixth superimposed signal, and the eighth superimposed signal to obtain a second output signal.

[0044] In this possible implementation, by performing mixing processing on the electrical signals of the determined 4 initial phases and the electrical signals of three groups of different offset phases respectively, the high-order harmonics in the electrical signals after mixing output by the first four-phase mixer are well suppressed.

[0045] In a possible implementation of the first aspect, the mixing circuit includes a first two-phase mixer, a second two-phase mixer, a four-phase mixer, a first adder, and a second adder. The first two-phase mixer, the second two-phase mixer, and the four-phase mixer are in parallel. The first adder is connected to the first two-phase mixer and the four-phase mixer, and the second adder is connected to the second two-phase mixer and the four-phase mixer. There is one group of electrical signals with offset phases.

[0046] The first two-phase mixer is used to mix and superimpose two electrical signals of initial phases located in the first phase space.

[0047] The second two-phase mixer is used to mix and superimpose two electrical signals of initial phases located in the second phase space.

[0048] The four-phase mixer is used to mix and superimpose two electrical signals of offset phases located in the first phase space, and to mix and superimpose two electrical signals of offset phases located in the second phase space.

[0049] The first adder superimposes the signal after mixing and superimposing the electrical signals of initial phases located in the first phase space and the signal after mixing and superimposing the electrical signals of offset phases located in the first phase space again to obtain a first output signal.

[0050] The second adder superimposes the signal obtained by mixing and superimposing the electrical signal of the initial phase in the second phase space with the signal obtained by mixing and superimposing the electrical signal of the offset phase in the second phase space to obtain a second output signal.

[0051] In this possible implementation, two two-phase mixers and one four-phase mixer are connected in parallel in the mixing circuit, which can achieve the same effect as connecting two four-phase mixers in parallel, and can effectively suppress the high-order harmonics in the mixed electrical signals output by the first two-phase mixer and the second two-phase mixer.

[0052] In a possible implementation of the first aspect, the four different initial phases are 0°, 90°, 180°, and 270° respectively, the phase offset of the electrical signal of the offset phase is 45°, and the offset phases corresponding to each initial phase are 45°, 135°, 225°, and 315° respectively.

[0053] The first two-phase mixer is used to mix two electrical signals with initial phases of 0° and 90° respectively with two first reference signals of 0° and 90° corresponding one by one, and superimpose the electrical signal after mixing at 0° and the electrical signal after mixing at 90° to obtain a first superimposed signal. The second two-phase mixer is used to mix two electrical signals with initial phases of 180° and 270° respectively with two first reference signals of 180° and 270° corresponding one by one, and superimpose the electrical signal after mixing at 180° and the electrical signal after mixing at 270° to obtain a second superimposed signal.

[0054] The four-phase mixer is used to mix four electrical signals of 45°, 135°, 225°, and 315° respectively with four second reference signals of 45°, 135°, 225°, and 315° corresponding one by one, and superimpose the electrical signal after mixing at 45° and the electrical signal after mixing at 135° to obtain a third superimposed signal, and superimpose the electrical signal after mixing at 225° and the electrical signal after mixing at 315° to obtain a fourth superimposed signal.

[0055] The first adder is used to superimpose the first superimposed signal and the third superimposed signal to obtain a first output signal.

[0056] The second adder is used to superimpose the second superimposed signal and the fourth superimposed signal to obtain a second output signal.

[0057] In this possible implementation, by performing mixing processing on the electrical signals of the determined four initial phases and the electrical signals of the four offset phases respectively, the high-order harmonics in the mixed electrical signals output by the first two-phase mixer and the second two-phase mixer can be effectively suppressed.

[0058] In a possible implementation of the first aspect, the multi-phase signal generator includes: a single-ended to differential converter, a multi-phase filter, and a phase conversion filter.

[0059] The single-ended to differential converter is used to convert an electrical signal into two electrical signals with initial phases of 0° and 180°.

[0060] The multi-phase filter is used to obtain four electrical signals with initial phases of 0°, 90°, 180°, and 270° through two electrical signals of 0° and 180°.

[0061] The phase conversion filter is used to obtain electrical signals of 4 offset phases with at least one set of the same phase offset according to the four electrical signals.

[0062] In a possible implementation of the first aspect, the control circuit includes a charge pump and a switch switching circuit.

[0063] The charge pump is used to process the first output signal and the second output signal into a target voltage signal.

[0064] The switch switching circuit is used to control the first voltage signal or the second voltage signal that operates with the target voltage signal by switching the switch to obtain a slope voltage signal.

[0065] In a possible implementation of the first aspect, the integration driving circuit includes an integrator and a driving amplifier;

[0066] The integrator is used to generate a driving signal according to the slope voltage signal.

[0067] The driving amplifier is used to amplify the driving signal, and the amplified driving signal is used to drive the laser signal to be output by the laser.

[0068] In a possible implementation of the first aspect, the first phase space is [0°, 180°), and the second phase space is [180° to 360°).

[0069] In a possible implementation of the first aspect, the optical component includes a laser, a beam splitter, an unequal-arm interferometer, and a photodetector. The laser, the beam splitter, the unequal-arm interferometer, and the photodetector are connected in sequence. The photodetector is connected to the multi-phase signal generator, and the laser is connected to the integration driving circuit.

[0070] The laser is used to emit a laser signal.

[0071] The beam splitter is used to divide the laser signal into a first optical signal and a second optical signal. The first optical signal is used to detect the target object, and the second optical signal is transmitted to the unequal-arm interferometer.

[0072] The unequal-arm interferometer is used to generate a mixed optical signal according to the second optical signal.

[0073] The photodetector is used to convert the mixed optical signal into an electrical signal.

[0074] The second aspect of the present application provides an electrical component applied to an optoelectronic phase-locked loop. The optoelectronic phase-locked loop includes an optical component and an electrical component. The electrical component includes a multi-phase signal generator, a mixing circuit, a control circuit, and an integration driving circuit. The multi-phase signal generator is connected to the optical component. The multi-phase signal generator, the mixing circuit, the control circuit, and the integration driving circuit are connected in sequence. The integration driving circuit is connected to the optical component.

[0075] The multi-phase signal generator is used to convert the electrical signal output by the optical component into electrical signals with 4 different initial phases, and generate at least one set of 4 offset-phase electrical signals with the same phase offset according to the 4 electrical signals with different initial phases. The 4 different initial phases are evenly distributed between 0° and 360°. When there are at least two sets of offset-phase electrical signals, the phase offset of the electrical signals in the same set is the same, and the phase offsets of the electrical signals in different sets are different.

[0076] The mixing circuit is used to mix the 4 electrical signals with different initial phases with the first reference signals corresponding to their phases respectively to obtain 4 initial mixed signals, and mix the offset-phase electrical signals of each group with the second reference signals corresponding to their phases respectively to obtain at least one set of offset mixed signals. Each set of offset mixed signals includes 4 offset mixed signals. The initial mixed signals obtained by mixing the electrical signals with initial phases located in the first phase space, and the offset mixed signals obtained by mixing the offset-phase electrical signals located in the first phase space are superimposed to obtain a first output signal. The initial mixed signals obtained by mixing the electrical signals with initial phases located in the second phase space and the offset mixed signals obtained by mixing the offset-phase electrical signals located in the second phase space are superimposed to obtain a second output signal. The union of the first phase space and the second phase space is 0° to 360°, and the intersection is empty.

[0077] The control circuit is used to process the first output signal and the second output signal to obtain a slope voltage signal.

[0078] The integration driving circuit is used to generate a driving signal according to the slope voltage signal. The driving signal is used to drive the laser signal to be emitted in the optical component.

[0079] The relevant content in this second aspect can be understood by referring to the introduction in the above first aspect, and will not be elaborated here.

[0080] In a possible implementation of the second aspect, the mixing circuit includes a first quadrature mixer, a second quadrature mixer, a first adder, and a second adder. The first quadrature mixer and the second quadrature mixer are connected in parallel, and the first adder and the second adder are respectively connected to the first quadrature mixer and the second quadrature mixer. There is a group of electrical signals with an offset phase.

[0081] The first quadrature mixer is configured to mix and superimpose two electrical signals with initial phases located in the first phase space, and mix and superimpose two electrical signals with initial phases located in the second phase space.

[0082] The second quadrature mixer is configured to mix and superimpose two electrical signals with offset phases located in the first phase space, and mix and superimpose two electrical signals with offset phases located in the second phase space.

[0083] The first adder superimposes the signal obtained by mixing and superimposing the electrical signals with initial phases in the first phase space and the signal obtained by mixing and superimposing the electrical signals with offset phases in the first phase space to obtain a first output signal.

[0084] The second adder superimposes the signal obtained by mixing and superimposing the electrical signals with initial phases in the second phase space and the signal obtained by mixing and superimposing the electrical signals with offset phases in the second phase space to obtain a second output signal.

[0085] In a possible implementation of the second aspect, the four different initial phases are 0°, 90°, 180°, and 270° respectively, the phase offset of the electrical signal with the offset phase is 45°, and the offset phases corresponding to each initial phase are 45°, 135°, 225°, and 315° respectively.

[0086] The first quadrature mixer is configured to mix four electrical signals of 0°, 90°, 180°, and 270° with four first reference signals of 0°, 90°, 180°, and 270° respectively, superimpose the electrical signal after mixing 0° and the electrical signal after mixing 90° to obtain a first superimposed signal, and superimpose the electrical signal after mixing 180° and the electrical signal after mixing 270° to obtain a second superimposed signal.

[0087] The second quadrature mixer is configured to mix four electrical signals of 45°, 135°, 225°, and 315° with four second reference signals of 45°, 135°, 225°, and 315° respectively, superimpose the electrical signal after mixing 45° and the electrical signal after mixing 135° to obtain a third superimposed signal, and superimpose the electrical signal after mixing 225° and the electrical signal after mixing 315° to obtain a fourth superimposed signal.

[0088] The first adder is used to superimpose the first superimposed signal and the third superimposed signal to obtain a first output signal.

[0089] The second adder is used to superimpose the second superimposed signal and the fourth superimposed signal to obtain a second output signal.

[0090] In a possible implementation of the second aspect, the mixing circuit includes a first quadrature mixer, a second quadrature mixer, a third quadrature mixer, a fourth quadrature mixer, a first adder, and a second adder connected in parallel. The first quadrature mixer, the second quadrature mixer, the third quadrature mixer, and the fourth quadrature mixer are connected in parallel. The first adder and the second adder are respectively connected to the first quadrature mixer, the second quadrature mixer, the third quadrature mixer, and the fourth quadrature mixer. There are three sets of electrical signals with offset phases.

[0091] The first quadrature mixer is used to mix and superimpose two electrical signals with initial phases in the first phase space, and to mix and superimpose two electrical signals with initial phases in the second phase space.

[0092] The second quadrature mixer is used to mix and superimpose two electrical signals with offset phases in the first phase space among the first set of offset-phase electrical signals in the three sets, and to mix and superimpose two electrical signals with offset phases in the second phase space.

[0093] The third quadrature mixer is used to mix and superimpose two electrical signals with offset phases in the first phase space among the second set of offset-phase electrical signals in the three sets, and to mix and superimpose two electrical signals with offset phases in the second phase space.

[0094] The fourth quadrature mixer is used to mix and superimpose two electrical signals with offset phases in the first phase space among the third set of offset-phase electrical signals in the three sets, and to mix and superimpose two electrical signals with offset phases in the second phase space.

[0095] The first adder superimposes the signal obtained by mixing and superimposing the electrical signals with initial phases in the first phase space and the signals obtained by mixing and superimposing the electrical signals with offset phases in the first phase space of each set in the three sets to obtain a first output signal.

[0096] The second adder superimposes the signal obtained by mixing and superimposing the electrical signals with initial phases in the second phase space and the signals obtained by mixing and superimposing the electrical signals with offset phases in the second phase space of each set in the three sets to obtain a second output signal.

[0097] In a possible implementation of the second aspect, the four different initial phases are 0°, 90°, 180°, and 270° respectively, and the phase offsets of each group in the three groups are 22.5°, 45°, and 67.5° respectively; the three offset phases corresponding to each initial phase are 22.5°, 112.5°, 202.5°, and 292.5°, 45°, 135°, 225°, and 315°, and 67.5°, 157.5°, 247.5°, and 337.5°.

[0098] The first four-phase mixer is used to mix the four electrical signals of 0°, 90°, 180°, and 270° with the four first reference signals of 0°, 90°, 180°, and 270° respectively, and superimpose the electrical signal after mixing at 0° and the electrical signal after mixing at 90° to obtain a first superimposed signal, and superimpose the electrical signal after mixing at 180° and the electrical signal after mixing at 270° to obtain a second superimposed signal.

[0099] The second four-phase mixer is used to mix the four electrical signals of 45°, 135°, 225°, and 315° with the four second reference signals of 45°, 135°, 225°, and 315° respectively, and superimpose the electrical signal after mixing at 45° and the electrical signal after mixing at 135° to obtain a third superimposed signal, and superimpose the electrical signal after mixing at 225° and the electrical signal after mixing at 315° to obtain a fourth superimposed signal.

[0100] The third four-phase mixer is used to mix the four electrical signals of 22.5°, 112.5°, 202.5°, and 292.5° with the four second reference signals of 22.5°, 112.5°, 202.5°, and 292.5° respectively, and superimpose the electrical signal after mixing at 22.5° and the electrical signal after mixing at 112.5° to obtain a fifth superimposed signal, and superimpose the electrical signal after mixing at 202.5° and the electrical signal after mixing at 292.5° to obtain a sixth superimposed signal.

[0101] The fourth four-phase mixer is used to mix the four electrical signals of 67.5°, 157.5°, 247.5°, and 337.5° with the four second reference signals of 67.5°, 157.5°, 247.5°, and 337.5° respectively, and superimpose the electrical signal after mixing at 67.5° and the electrical signal after mixing at 157.5° to obtain a seventh superimposed signal, and superimpose the electrical signal after mixing at 247.5° and the electrical signal after mixing at 337.5° to obtain an eighth superimposed signal.

[0102] The first adder is used to superimpose the first superimposed signal, the third superimposed signal, the fifth superimposed signal, and the seventh superimposed signal to obtain a first output signal.

[0103] The second adder is used to superimpose the second superimposed signal, the fourth superimposed signal, the sixth superimposed signal, and the eighth superimposed signal to obtain a second output signal.

[0104] In a possible implementation of the second aspect, the mixing circuit includes a first two-phase mixer, a second two-phase mixer, a four-phase mixer, a first adder, and a second adder. The first two-phase mixer, the second two-phase mixer, and the four-phase mixer are connected in parallel. The first adder is connected to the first two-phase mixer and the four-phase mixer, and the second adder is connected to the second two-phase mixer and the four-phase mixer. There is a set of electrical signals with an offset phase.

[0105] The first two-phase mixer is used to mix and superimpose two electrical signals with initial phases located in the first phase space.

[0106] The second two-phase mixer is used to mix and superimpose two electrical signals with initial phases located in the second phase space.

[0107] The four-phase mixer is used to mix and superimpose two electrical signals with offset phases located in the first phase space, and to mix and superimpose two electrical signals with offset phases located in the second phase space.

[0108] The first adder superimposes the signal obtained by mixing and superimposing the electrical signals with the initial phase in the first phase space and the signal obtained by mixing and superimposing the electrical signals with the offset phase in the first phase space to obtain a first output signal.

[0109] The second adder superimposes the signal obtained by mixing and superimposing the electrical signals with the initial phase in the second phase space and the signal obtained by mixing and superimposing the electrical signals with the offset phase in the second phase space to obtain a second output signal.

[0110] In a possible implementation of the second aspect, the four different initial phases are 0°, 90°, 180°, and 270° respectively, the phase offset of the electrical signal with the offset phase is 45°, and the phase offsets corresponding to each initial phase are 45°, 135°, 225°, and 315° respectively.

[0111] The first two-phase mixer is used to mix two electrical signals with initial phases of 0° and 90° respectively with two first reference signals of 0° and 90° corresponding one by one, and superimpose the electrical signal after mixing 0° and the electrical signal after mixing 90° to obtain a first superimposed signal. The second two-phase mixer is used to mix two electrical signals with initial phases of 180° and 270° respectively with two first reference signals of 180° and 270° corresponding one by one, and superimpose the electrical signal after mixing 180° and the electrical signal after mixing 270° to obtain a second superimposed signal.

[0112] The four-phase mixer is used to mix four electrical signals at 45°, 135°, 225°, and 315° with four second reference signals at 45°, 135°, 225°, and 315° respectively, and superimpose the electrical signal after 45° mixing and the electrical signal after 135° mixing to obtain a third superimposed signal, and superimpose the electrical signal after 225° mixing and the electrical signal after 315° mixing to obtain a fourth superimposed signal.

[0113] The first adder is used to superimpose the first superimposed signal and the third superimposed signal to obtain a first output signal.

[0114] The second adder is used to superimpose the second superimposed signal and the fourth superimposed signal to obtain a second output signal.

[0115] In a possible implementation of the second aspect, the multi-phase signal generator includes: a single-ended to differential converter, a multi-phase filter, and a phase conversion filter.

[0116] The single-ended to differential converter is used to convert an electrical signal into two electrical signals with initial phases of 0° and 180°.

[0117] The multi-phase filter is used to obtain four electrical signals with initial phases of 0°, 90°, 180°, and 270° through two electrical signals of 0° and 180°.

[0118] The phase conversion filter is used to obtain four electrical signals with offset phases of at least one set of the same phase offset according to the four electrical signals.

[0119] In a possible implementation of the second aspect, the control circuit includes a charge pump and a switch switching circuit.

[0120] The charge pump is used to process the first output signal and the second output signal into a target voltage signal.

[0121] The switch switching circuit is used to control the first voltage signal or the second voltage signal operating with the target voltage signal by switching the switch to obtain a slope voltage signal.

[0122] In a possible implementation of the second aspect, the integration driving circuit includes an integrator and a driving amplifier.

[0123] The integrator is used to generate a driving signal according to the slope voltage signal.

[0124] The driving amplifier is used to amplify the driving signal, and the amplified driving signal is used to drive the laser signal to be output by the laser.

[0125] In a possible implementation of the second aspect, the electrical component is an electrical chip or an electrical chip system.

[0126] For the above, the effects of any possible implementation manner provided in the second aspect of the present application can refer to the optoelectronic phase-locked loop described in the above first aspect or any possible implementation manner of the first aspect.

[0127] The third aspect of the present application provides a laser ranging device, which is characterized by including a detector and an optoelectronic phase-locked loop; the detector is used to detect a target object; the optoelectronic phase-locked loop is the optoelectronic phase-locked loop described in the above first aspect or any possible implementation manner of the first aspect.

[0128] The fourth aspect of the present application provides an electronic device, and the laser ranging device described in the third aspect is installed in the electronic device. Description of the Drawings

[0129] Figure 1 It is a schematic diagram of a scenario of the application of the lidar provided by the embodiment of the present application;

[0130] Figure 2 It is another schematic diagram of a scenario of the application of the lidar provided by the embodiment of the present application;

[0131] Figure 3 It is a schematic diagram of a structure of the optoelectronic phase-locked loop provided by the embodiment of the present application;

[0132] Figure 4 It is another schematic diagram of a structure of the optoelectronic phase-locked loop provided by the embodiment of the present application;

[0133] Figure 5 It is a schematic diagram of a structure of the optical component in the optoelectronic phase-locked loop provided by the embodiment of the present application;

[0134] Figure 6 It is a schematic diagram of a structure of the multi-phase signal generator in the optoelectronic phase-locked loop provided by the embodiment of the present application;

[0135] Figure 7A It is a schematic diagram of a structure of the mixing circuit in the optoelectronic phase-locked loop provided by the embodiment of the present application;

[0136] Figure 7B It is another schematic diagram of a structure of the mixing circuit in the optoelectronic phase-locked loop provided by the embodiment of the present application;

[0137] Figure 8A It is another schematic diagram of a structure of the mixing circuit in the optoelectronic phase-locked loop provided by the embodiment of the present application;

[0138] Figure 8B It is another schematic diagram of a structure of the mixing circuit in the optoelectronic phase-locked loop provided by the embodiment of the present application;

[0139] Figure 9AIt is another schematic structural diagram of the mixing circuit in the optoelectronic phase-locked loop provided by the embodiment of the present application;

[0140] Figure 9B It is another schematic structural diagram of the mixing circuit in the optoelectronic phase-locked loop provided by the embodiment of the present application;

[0141] Figure 10 It is a schematic structural diagram of the control circuit in the optoelectronic phase-locked loop provided by the embodiment of the present application;

[0142] Figure 11 It is a schematic structural diagram of the integral driving circuit in the optoelectronic phase-locked loop provided by the embodiment of the present application;

[0143] Figure 12 It is another schematic structural diagram of the optoelectronic phase-locked loop provided by the embodiment of the present application;

[0144] Figure 13A It is another schematic structural diagram of the optoelectronic phase-locked loop provided by the embodiment of the present application;

[0145] Figure 13B It is an exemplary schematic diagram of the signal mixing process provided by the embodiment of the present application;

[0146] Figure 14A It is another schematic structural diagram of the optoelectronic phase-locked loop provided by the embodiment of the present application;

[0147] Figure 14B It is an exemplary schematic diagram of the signal mixing process provided by the embodiment of the present application. Detailed implementation manners

[0148] Next, in conjunction with the accompanying drawings, the embodiments of the present application will be described. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. Those of ordinary skill in the art will know that with the development of technology and the emergence of new scenarios, the technical solutions provided by the embodiments of the present application are equally applicable to similar technical problems.

[0149] Terms such as "first" and "second" in the specification, claims and above-mentioned drawings of the present application are used to distinguish similar objects, and do not have to be used to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so that the embodiments described here can be implemented in an order different from that shown or described here. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device that includes a series of steps or units does not have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0150] Embodiments of the present application provide an electro-optical phase-locked loop, which can reduce the influence of high-order harmonic components during the mixing process and improve the linearity of the laser signal emitted by the laser. The present application also provides an electrical component, a laser ranging device, and an electronic device applied to the electro-optical phase-locked loop. The following will be described in detail respectively.

[0151] As an efficient non-linear compensation scheme for frequency modulation continuous wave (FMCW) laser ranging devices, the electro-optical phase lock loop (EOPLL) is widely adopted.

[0152] The laser ranging device provided by the embodiments of the present application may include a laser rangefinder, a lidar, an optical frequency domain reflection (OFDR) device, etc.

[0153] The laser ranging device provided by the embodiments of the present application can be applied to some electronic devices, such as electronic devices that require ranging, such as vehicles, robots, and biological ranging devices.

[0154] Taking the application scenario of a vehicle as an example for the laser ranging device, as Figure 1 shown, there are two vehicles, vehicle A and vehicle B, driving in front and behind on the road. A lidar is installed on vehicle A. The lidar can emit a laser signal. After the laser signal detects vehicle B, it will return an echo signal. In this way, the lidar can determine a beat signal based on the emitted laser signal and the returned echo signal, and then calculate the distance information and speed information of the measured vehicle B according to the frequency of the beat signal.

[0155] Of course, Figure 1 only vehicle A and vehicle B are shown in , and only one lidar is shown on vehicle A. In fact, a lidar will be installed on each vehicle, and multiple lidars will be installed at different positions on one vehicle to measure target objects in different directions.

[0156] The above-mentioned Figure 1 lidar in can not only detect external target objects, but also correct the laser signal of the laser in the lidar through an electro-optical phase-locked loop inside. This process can be understood by referring to Figure 2 as Figure 2 shown, the lidar includes an electro-optical phase-locked loop, a detector, and a circulator. The electro-optical phase-locked loop includes a laser, a beam splitter, and some other devices. The laser is used to emit a laser signal. The beam splitter will divide the laser signal emitted by the laser into two paths. One path is used to detect target objects, such as Figure 1The vehicle in [description], and other devices on the other path entering the optoelectronic phase-locked loop, are used to correct the laser signal emitted by the laser. The circulator is used to loop back the local oscillator signal for detecting the target object and the echo signal returned by the detected target object, which are separated by the optical splitter, to the detector. The detector is used to determine a beat frequency signal based on the local oscillator signal and the echo signal, and then calculate the distance information and speed information of the measured vehicle according to the frequency magnitude of the beat frequency signal. In the embodiments of the present application, the local oscillator signal and the echo signal may be signals in the form of triangular waves, and the beat frequency signal may be a signal in the form of a sine wave.

[0157] The optoelectronic phase-locked loop provided by the embodiments of the present application can be referred to Figure 3 for understanding.

[0158] As Figure 3 shown, the optoelectronic phase-locked loop 10 provided by the embodiments of the present application includes an optical component 101 and an electrical component 102. The electrical component 102 includes a multi-phase signal generator 1021, a mixing circuit 1022, a control circuit 1023, and an integration driving circuit 1024. The multi-phase signal generator 1021 is connected to the optical component 101, and the multi-phase signal generator 1021, the mixing circuit 1022, the control circuit 1023, and the integration driving circuit 1024 are connected in sequence. The integration driving circuit 1024 is connected to the optical component 101. A plurality of four-phase mixers may be connected in parallel in the mixing circuit 1022.

[0159] The optical component 101 is used to convert the laser signal into an electrical signal.

[0160] The multi-phase signal generator 1021 is used to convert the electrical signal into electrical signals with 4 different initial phases, and generate at least one set of 4 offset-phase electrical signals with the same phase offset based on the electrical signals with 4 different initial phases. The 4 different initial phases are evenly distributed between 0° and 360°. When there are at least two sets of offset-phase electrical signals, the phase offset of the electrical signals in the same set is the same, and the phase offsets of the electrical signals in different sets are different.

[0161] The mixing circuit 1022 is configured to mix four electrical signals with different initial phases and the first reference signals corresponding to the respective phases to obtain four initial mixed signals, and to mix the electrical signals with offset phases in each group and the second reference signals corresponding to the respective phases to obtain at least one group of offset mixed signals, where each group of offset mixed signals includes four offset mixed signals. The initial mixed signals obtained by mixing the electrical signals with the initial phases in the first phase space and the offset mixed signals obtained by mixing the electrical signals with the offset phases in the first phase space are superimposed to obtain a first output signal. The initial mixed signals obtained by mixing the electrical signals with the initial phases in the second phase space and the offset mixed signals obtained by mixing the electrical signals with the offset phases in the second phase space are superimposed to obtain a second output signal. The union of the first phase space and the second phase space is from 0° to 360°, and the intersection is empty.

[0162] The control circuit 1023 is configured to process the first output signal and the second output signal to obtain a slope voltage signal.

[0163] The integration driving circuit 1024 is configured to generate a driving signal according to the slope voltage signal, and the driving signal is used to drive the laser signal to be emitted in the optical component.

[0164] In the embodiment of the present application, the optoelectronic phase-locked loop is a feedback circuit that corrects the driving signal of the optical signal through the electrical signal after optoelectronic conversion, so that the laser emits a laser signal with a linearity meeting the requirements. The optoelectronic phase-locked loop generally includes an optical component and an electrical component, and the optical component and the electrical component form a loop. The components in the optical component are configured to emit a laser signal, and after processing the laser signal, convert the optical signal into an electrical signal. The components in the electrical component process the electrical signal received from the optical component, and then correct the driving signal for driving the laser signal.

[0165] In the embodiment of the present application, the initial phase is relative to the offset phase. The electrical signal with the offset phase can be obtained by vector addition on the electrical signal with the initial phase. By adding the same offset phase amount to each initial phase, a group of electrical signals with offset phases can be obtained. The phase offset amounts added to different groups are different. When there are two or more groups of electrical signals with offset phases, the phase offset amount of each group is usually evenly distributed between 0° and 90°.

[0166] In the embodiment of the present application, usually two or more mixers are connected in parallel in the mixing circuit. The mixers connected in parallel can be four-phase mixers, or a combination of two-phase mixers and four-phase mixers, or eight-phase mixers, or a combination of four-phase mixers and eight-phase mixers. Of course, it can also be a combination of other different types of mixers.

[0167] In the embodiments of the present application, the "corresponding phase" can be understood as the same phase. For example, the initial signal of 0° is mixed with the first reference signal of 0°, the initial signal of 90° is mixed with the first reference signal of 90°, the initial signal of 180° is mixed with the first reference signal of 180°, and the initial signal of 270° is mixed with the first reference signal of 270°. The mixing process of the electrical signal with the offset phase and the second reference signal can also be understood by referring to the explanation here.

[0168] In the embodiments of the present application, an electrical signal with an offset phase having a phase offset from the electrical signal of the initial phase is introduced during mixing. Thus, by superimposing the mixed signal of the electrical signal with the offset phase and the mixed signal of the electrical signal of the initial phase, the high-order harmonics in the electrical signal after mixing can be well suppressed, the ability of the optoelectronic phase-locked loop is improved, and the linearity of the laser signal output by the laser is also enhanced.

[0169] In the above embodiments, as Figure 4 shown, the optical component 101 may include a laser 1011, a beam splitter 1012, an unbalanced interferometer 1013, and a photodetector (PD) 1014. The laser 1011, the beam splitter 1012, the unbalanced interferometer (Mach-Zehnder Interferometer, MZI) 1013, and the photodetector 1014 are connected in sequence. The photodetector 1014 is connected to the multi-phase signal generator 1021, and the laser 1011 is connected to the integral drive circuit 1024.

[0170] The laser 1011 is configured to emit a laser signal.

[0171] The beam splitter 1012 is configured to divide the laser signal into a first optical signal and a second optical signal. The first optical signal is used to detect the target object, and the second optical signal is transmitted to the unbalanced interferometer.

[0172] The unbalanced interferometer 1013 is configured to generate a mixed optical signal based on the second optical signal.

[0173] The photodetector 1014 is configured to convert the mixed optical signal into an electrical signal.

[0174] The electrical signal output by the photodetector 1014 will be processed by the multi-phase signal generator 1021 of the electrical component. The processing process can be understood by referring to the corresponding content of the corresponding embodiment part above. Figure 3 The corresponding content of the corresponding embodiment part above can be referred to for understanding.

[0175] The structure of the optical component 101 can also be understood by referring to Figure 5 For understanding, as Figure 5As shown, the laser emits a laser signal 301 which is transmitted to a beam splitter. The beam splitter divides the laser signal 301 into a first optical signal 302 and a second optical signal 303. The first optical signal 302 is used to detect the target object, and the second optical signal 303 is transmitted to an unbalanced interferometer.

[0176] The working principle of the unbalanced interferometer is that it can divide the second optical signal 303 into two paths. One path directly transmits an analog local oscillator signal, and the other path is delayed by a delay device and then the two paths of signals are subjected to beat frequency processing to obtain a mixed optical signal 304. The mixed optical signal 304 is transmitted to a photodetector, and the photodetector converts the mixed optical signal 304 into an electrical signal 305 and outputs the electrical signal 305 to an electrical component.

[0177] In the embodiment of the present application, as Figure 6 shown, the multi-phase signal generator 1021 may include: a single-ended to differential converter 10211, a multi-phase filter 10212, and a phase conversion filter 10213. The single-ended to differential converter 10211, the multi-phase filter 10212, and the phase conversion filter 10213 are connected in sequence. The single-ended to differential converter 10211 can receive the electrical signal output by the photodetector 1014, and the phase conversion filter 10213 is connected to the mixing circuit 1022.

[0178] The single-ended to differential converter 10211 is used to convert the electrical signal into two paths of electrical signals with an initial phase of 0° and 180°.

[0179] The multi-phase filter 10212 is used to obtain four paths of electrical signals with initial phases of 0°, 90°, 180°, and 270° through the two paths of electrical signals of 0° and 180°.

[0180] The phase conversion filter 10213 is used to obtain at least one group of four electrical signals with the same phase offset according to the four paths of electrical signals.

[0181] The phase conversion filter 10213 can be a 4-phase to 8-phase filter or a 4-phase to 16-phase filter. Of course, it can also be other types of phase conversion filters.

[0182] The phase conversion filter 10213 in the embodiment of the present application is corresponding to the number or type of mixers in the mixing circuit. Next, the mixing circuit 1022 will be introduced in conjunction with the accompanying drawings.

[0183] As Figure 7A shown, the mixing circuit 1022 may include two parallel four-phase mixers and two adders, as Figure 7AThe first four-phase mixer, the second four-phase mixer, the first adder, and the second adder shown in [figure reference] are such that the first four-phase mixer and the second four-phase mixer are in parallel, and the first adder and the second adder are respectively connected to the first four-phase mixer and the second four-phase mixer. At this time, the phase conversion filter 10213 can be a 4-phase to 8-phase filter. This 4-phase to 8-phase filter only needs to obtain a set of offset phases based on 4 initial phases.

[0184] In this Figure 7A scenario, the working process of each device in the mixer circuit can include:

[0185] The first four-phase mixer is used to mix and superimpose the electrical signals of two initial phases located in the first phase space, and to mix and superimpose the electrical signals of two initial phases located in the second phase space.

[0186] The second four-phase mixer is used to mix and superimpose the electrical signals of two offset phases located in the first phase space, and to mix and superimpose the electrical signals of two offset phases located in the second phase space.

[0187] The first adder superimposes the signal obtained by mixing and superimposing the electrical signal of the initial phase in the first phase space and the signal obtained by mixing and superimposing the electrical signal of the offset phase in the first phase space again to obtain a first output signal.

[0188] The second adder superimposes the signal obtained by mixing and superimposing the electrical signal of the initial phase in the second phase space and the signal obtained by mixing and superimposing the electrical signal of the offset phase in the second phase space again to obtain a second output signal.

[0189] The 4 different initial phases can be 0°, 90°, 180°, and 270° respectively, the phase offset of the electrical signal of the offset phase is 45°, and the offset phases corresponding to each initial phase are 45°, 135°, 225°, and 315° respectively.

[0190] It should be noted that in the embodiments of the present application, the electrical signal of the initial phase can be referred to as the initial signal, and the electrical signal of the offset phase can be referred to as the offset signal. For example: the electrical signal of the 0° initial phase can be described as the 0° initial signal, the electrical signal of the 90° initial phase can be described as the 90° initial signal, the electrical signal of the 180° initial phase can be described as the 180° initial signal, the electrical signal of the 270° initial phase can be described as the 270° initial signal, the electrical signal of the 45° offset phase can be described as the 45° offset signal, the electrical signal of the 135° offset phase can be described as the 135° offset signal, the electrical signal of the 225° offset phase can be described as the 225° offset signal, and the electrical signal of the 315° offset phase can be described as the 315° offset signal.

[0191] AsFigure 7B As shown, the first quadrature mixer is configured to mix four electrical signals at 0°, 90°, 180°, and 270° with four first reference signals at 0°, 90°, 180°, and 270° respectively, and superimpose the electrical signal after 0° mixing and the electrical signal after 90° mixing to obtain a first superimposed signal, and superimpose the electrical signal after 180° mixing and the electrical signal after 270° mixing to obtain a second superimposed signal.

[0192] The second quadrature mixer is configured to mix four electrical signals at 45°, 135°, 225°, and 315° with four second reference signals at 45°, 135°, 225°, and 315° respectively, and superimpose the electrical signal after 45° mixing and the electrical signal after 135° mixing to obtain a third superimposed signal, and superimpose the electrical signal after 225° mixing and the electrical signal after 315° mixing to obtain a fourth superimposed signal.

[0193] The first adder is configured to superimpose the first superimposed signal and the third superimposed signal to obtain a first output signal.

[0194] The second adder is configured to superimpose the second superimposed signal and the fourth superimposed signal to obtain a second output signal.

[0195] In the embodiment of the present application, two quadrature mixers are connected in parallel in the mixing circuit. In this way, the electrical signals with the initial phase can be mixed by one quadrature mixer, and the electrical signals with the offset phase can be mixed by the other quadrature mixer. Then, the signals output by these two quadrature mixers are superimposed, which can effectively suppress the high-order harmonics in the electrical signals after mixing output by the first quadrature mixer.

[0196] As Figure 8A shown, the mixing circuit 1022 may include four quadrature mixers connected in parallel and two adders, such as the first quadrature mixer, the second quadrature mixer, the third quadrature mixer, the fourth quadrature mixer, the first adder, and the second adder shown in Figure 8A . The first quadrature mixer, the second quadrature mixer, the third quadrature mixer, and the fourth quadrature mixer are connected in parallel, and the first adder and the second adder are respectively connected to the first quadrature mixer, the second quadrature mixer, the third quadrature mixer, and the fourth quadrature mixer. At this time, the phase conversion filter 10213 may be a 4-phase to 16-phase filter. The 4-phase to 16-phase filter needs to obtain three groups of offset phases according to 4 initial phases.

[0197] In this Figure 8A scenario, the working process of each device in the mixing circuit may include:

[0198] The first four-phase mixer is used to mix and superimpose two electrical signals with initial phases in the first phase space, and to mix and superimpose two electrical signals with initial phases in the second phase space.

[0199] The second four-phase mixer is used to mix and superimpose two electrical signals with offset phases in the first phase space among the first group of offset-phase electrical signals in the three groups, and to mix and superimpose two electrical signals with offset phases in the second phase space.

[0200] The third four-phase mixer is used to mix and superimpose two electrical signals with offset phases in the first phase space among the second group of offset-phase electrical signals in the three groups, and to mix and superimpose two electrical signals with offset phases in the second phase space.

[0201] The fourth four-phase mixer is used to mix and superimpose two electrical signals with offset phases in the first phase space among the third group of offset-phase electrical signals in the three groups, and to mix and superimpose two electrical signals with offset phases in the second phase space.

[0202] The first adder superimposes the signal obtained by mixing and superimposing the electrical signals with initial phases in the first phase space with the signals obtained by mixing and superimposing the electrical signals with offset phases in the first phase space of each group in the three groups, so as to obtain a first output signal.

[0203] The second adder superimposes the signal obtained by mixing and superimposing the electrical signals with initial phases in the second phase space with the signals obtained by mixing and superimposing the electrical signals with offset phases in the second phase space of each group in the three groups, so as to obtain a second output signal.

[0204] The 4 different initial phases can be 0°, 90°, 180°, and 270° respectively, and the phase offset amounts of each group in the three groups are 22.5°, 45°, and 67.5° respectively; the three groups of offset phases corresponding to each initial phase are 22.5°, 112.5°, 202.5°, and 292.5°, 45°, 135°, 225°, and 315°, and 67.5°, 157.5°, 247.5°, and 337.5°.

[0205] As Figure 8B shown, the first four-phase mixer is used to mix four electrical signals of 0°, 90°, 180°, and 270° with four first reference signals of 0°, 90°, 180°, and 270° corresponding one by one respectively, superimpose the electrical signal after mixing 0° and the electrical signal after mixing 90° to obtain a first superimposed signal, and superimpose the electrical signal after mixing 180° and the electrical signal after mixing 270° to obtain a second superimposed signal.

[0206] The second quadrature mixer is used to mix four electrical signals at 45°, 135°, 225°, and 315° with four second reference signals at 45°, 135°, 225°, and 315° respectively, and superimpose the electrical signals after mixing at 45° and the electrical signals after mixing at 135° to obtain a third superimposed signal, and superimpose the electrical signals after mixing at 225° and the electrical signals after mixing at 315° to obtain a fourth superimposed signal.

[0207] The third quadrature mixer is used to mix four electrical signals at 22.5°, 112.5°, 202.5°, and 292.5° with four second reference signals at 22.5°, 112.5°, 202.5°, and 292.5° respectively, and superimpose the electrical signals after mixing at 22.5° and the electrical signals after mixing at 112.5° to obtain a fifth superimposed signal, and superimpose the electrical signals after mixing at 202.5° and the electrical signals after mixing at 292.5° to obtain a sixth superimposed signal.

[0208] The fourth quadrature mixer is used to mix four electrical signals at 67.5°, 157.5°, 247.5°, and 337.5° with four second reference signals at 67.5°, 157.5°, 247.5°, and 337.5° respectively, and superimpose the electrical signals after mixing at 67.5° and the electrical signals after mixing at 157.5° to obtain a seventh superimposed signal, and superimpose the electrical signals after mixing at 247.5° and the electrical signals after mixing at 337.5° to obtain an eighth superimposed signal.

[0209] The first adder is used to superimpose the first superimposed signal, the third superimposed signal, the fifth superimposed signal, and the seventh superimposed signal to obtain a first output signal.

[0210] The second adder is used to superimpose the second superimposed signal, the fourth superimposed signal, the sixth superimposed signal, and the eighth superimposed signal to obtain a second output signal.

[0211] In the embodiment of the present application, four quadrature mixers are connected in parallel in the mixing circuit. In this way, the electrical signals with the initial phase can be mixed by one quadrature mixer, and the electrical signals with different offset phases can be mixed by the other three quadrature mixers. Then, the signals output by these four quadrature mixers are superimposed, which can well suppress the high-order harmonics in the electrical signals after mixing output by the first quadrature mixer.

[0212] As Figure 9A shown, the mixing circuit 1022 may include two two-phase mixers connected in parallel, one quadrature mixer, and two adders. As Figure 9AThe first two-phase mixer, the second two-phase mixer, the four-phase mixer, the first adder, and the second adder shown in the figure. The first two-phase mixer, the second two-phase mixer, and the four-phase mixer are connected in parallel. The first adder is connected to the first two-phase mixer and the four-phase mixer, and the second adder is connected to the second two-phase mixer and the four-phase mixer. At this time, the phase conversion filter 10213 can be a 4-phase to 8-phase filter. The 4-phase to 8-phase filter only needs to obtain a set of offset phases based on four initial phases.

[0213] In this Figure 9A scenario, the working process of each device in the mixing circuit may include:

[0214] The first two-phase mixer is used to mix and superimpose the electrical signals of two initial phases located in the first phase space.

[0215] The second two-phase mixer is used to mix and superimpose the electrical signals of two initial phases located in the second phase space.

[0216] The four-phase mixer is used to mix and superimpose the electrical signals of two offset phases located in the first phase space, and to mix and superimpose the electrical signals of two offset phases located in the second phase space.

[0217] The first adder superimposes the signal after mixing and superimposing the electrical signal of the initial phase in the first phase space and the signal after mixing and superimposing the electrical signal of the offset phase in the first phase space to obtain a first output signal.

[0218] The second adder superimposes the signal after mixing and superimposing the electrical signal of the initial phase in the second phase space and the signal after mixing and superimposing the electrical signal of the offset phase in the second phase space to obtain a second output signal.

[0219] The four different initial phases are 0°, 90°, 180°, and 270° respectively. The phase offset of the electrical signal of the offset phase is 45°. The offset phases corresponding to each initial phase are 45°, 135°, 225°, and 315° respectively.

[0220] As Figure 9B shown, the first two-phase mixer is used to mix the electrical signals of two paths with initial phases of 0° and 90° respectively with the first reference signals of two paths corresponding to 0° and 90° respectively, and superimpose the electrical signal after mixing at 0° and the electrical signal after mixing at 90° to obtain a first superimposed signal. The second two-phase mixer is used to mix the electrical signals of two paths with initial phases of 180° and 270° respectively with the first reference signals of two paths corresponding to 180° and 270° respectively, and superimpose the electrical signal after mixing at 180° and the electrical signal after mixing at 270° to obtain a second superimposed signal.

[0221] The four-phase mixer is used to mix four electrical signals at 45°, 135°, 225°, and 315° with four second reference signals at 45°, 135°, 225°, and 315° respectively, and superimpose the electrical signal after mixing at 45° and the electrical signal after mixing at 135° to obtain a third superimposed signal, and superimpose the electrical signal after mixing at 225° and the electrical signal after mixing at 315° to obtain a fourth superimposed signal.

[0222] The first adder is used to superimpose the first superimposed signal and the third superimposed signal to obtain a first output signal.

[0223] The second adder is used to superimpose the second superimposed signal and the fourth superimposed signal to obtain a second output signal.

[0224] In the embodiment of the present application, two two-phase mixers and a four-phase mixer are connected in parallel in the mixing circuit, and the same effect as connecting two four-phase mixers in parallel can be obtained, and the high-order harmonics in the electrical signals after mixing output by the first two-phase mixer and the second two-phase mixer can be well suppressed.

[0225] In the embodiment of the present application, both the first reference signal and the second reference signal can be clock reference signals. The first reference signal is a reference signal used to mix with an initial signal or an offset signal located in the first phase space respectively, and the second reference signal is a reference signal used to mix with an initial signal or an offset signal located in the second phase space respectively. The first phase space is usually [0°, 180°), and the second phase space is usually [180° to 360°).

[0226] Of course, the above Figure 7A , Figure 8A and Figure 9A The combination relationship is only several examples. In fact, any combination of two-phase, four-phase, eight-phase or more-phase mixers, as long as the idea of the embodiment of the present application is applied, can be the solution protected by the embodiment of the present application.

[0227] The control circuit 1023 in the above embodiment is as Figure 10 shown, including a charge pump 10231 and a switch switching circuit 10232. The charge pump 10231 and the switch switching circuit 10232 are connected. The charge pump 10231 is connected to the mixing circuit 1022, and the switch switching circuit 10232 is connected to the integration driving circuit 1024.

[0228] The charge pump 10231 is used to process the first output signal and the second output signal into a target voltage signal. The switch switching circuit 10232 is used to control the first voltage signal or the second voltage signal that operates with the target voltage signal by switching the switch to obtain a slope voltage signal.

[0229] The integration driving circuit 1024 in the above embodiments is as Figure 11 shown, including an integrator 10241 and a driving amplifier 10242; the integrator 10241 is connected to the driving amplifier 10242, the integrator 10241 is connected to the control circuit 1023, and the driving amplifier 10242 is connected to the laser 1011.

[0230] The integrator 10241 is used to generate a driving signal according to the slope voltage signal. The driving amplifier 10242 is used to amplify the driving signal, and the amplified driving signal is used to drive the laser signal to be output by the laser.

[0231] The branch devices of the optoelectronic phase-locked loop have been described above. Next, the overall working process of the optoelectronic phase-locked loop will be described with the scenario where the mixer circuit is composed of two parallel quadrature mixers and four parallel quadrature mixers.

[0232] 1. The mixer circuit is composed of two parallel quadrature mixers.

[0233] As Figure 13A shown, in the optoelectronic phase-locked loop 10, the laser 1011 emits a laser signal, the optical splitter 1012 divides the laser signal into a first optical signal and a second optical signal. The first optical signal is used to detect the target, and the second optical signal is transmitted to the unbalanced interferometer 1013. The unbalanced interferometer 1013 divides the second optical signal into two paths, one path directly transmits the analog local oscillator signal, and the other path undergoes a delay process, and then these two paths of signals are subjected to a beat frequency process to obtain a mixed optical signal. This mixed optical signal is transmitted to the photodetector 1014, and the photodetector 1014 converts this mixed optical signal into an electrical signal and outputs the electrical signal to the single-ended to differential converter 10211.

[0234] The single-ended to differential converter 10211 converts the electrical signal into two paths of electrical signals with an initial phase of 0° and 180°. Then, the two paths of electrical signals with 0° and 180° are transmitted to the multi-phase filter 10212. The multi-phase filter 10212 obtains four paths of electrical signals with initial phases of 0°, 90°, 180°, and 270° through the two paths of electrical signals with 0° and 180°. These four paths of electrical signals can be used as the input signals of the first quadrature mixer in the mixer circuit 1022.

[0235] The single-ended to differential converter 10211 transmits the four paths of electrical signals with initial phases of 0°, 90°, 180°, and 270° to the 4-phase to 8-phase filter. The 4-phase to 8-phase filter obtains four paths of electrical signals with offset phases of 45°, 135°, 225°, and 315° through vector addition according to the four paths of electrical signals with initial phases of 0°, 90°, 180°, and 270°. These four paths of electrical signals can be used as the input signals of the second quadrature mixer in the mixer circuit 1022.

[0236] The four electrical signals with initial phases and the four electrical signals with offset phases are respectively mixed with the corresponding reference signals with the same phases. This process can be referred to Figure 13B for understanding, such as Figure 13B in:

[0237] In the first four-phase mixer, the 0° initial signal is mixed with the 0° reference signal to generate mixing signal 1, the 90° initial signal is mixed with the 90° reference signal to generate mixing signal 2, the 180° initial signal is mixed with the 180° reference signal to generate mixing signal 3, the 270° initial signal is mixed with the 270° reference signal to generate mixing signal 4. Mixing signal 1 and mixing signal 2 are added together to generate mixing signal 5 output in the positive phase of the first four-phase mixer; mixing signal 3 and mixing signal 4 are added together to generate mixing signal 6 output in the negative phase of the first four-phase mixer.

[0238] In the second four-phase mixer, the 45° offset signal is mixed with the 45° reference signal to generate mixing signal 7, the 135° offset signal is mixed with the 135° reference signal to generate mixing signal 8, the 225° offset signal is mixed with the 225° reference signal to generate mixing signal 9, the 315° offset signal is mixed with the 315° reference signal to generate mixing signal 10. Mixing signal 7 and mixing signal 8 are added together to generate mixing signal 11 output in the positive phase of the second four-phase mixer; mixing signal 9 and mixing signal 10 are added together to generate mixing signal 12 output in the negative phase of the second four-phase mixer.

[0239] The first adder adds mixing signal 5 and mixing signal 11 to generate mixing signal 13, which is used as the final positive-phase output signal, that is, the first output signal.

[0240] The second adder adds mixing signal 6 and mixing signal 12 to generate mixing signal 14, which is used as the final negative-phase output signal, that is, the second output signal.

[0241] The first output signal and the second output signal are transmitted to charge pump 10231. Charge pump 10231 converts the first output signal and the second output signal into single-ended current signals. The conversion process can be to take the difference between the first output signal and the second output signal, and then convert the single-ended current signal into a target voltage signal. This target voltage signal is transmitted to switch switching circuit 10232.

[0242] The switch switching circuit 10232 can select the first voltage signal (high voltage signal) or the second voltage signal (low voltage signal) through a switching switch, and then perform an operation on the selected first voltage signal or second voltage signal and the target voltage signal, which can be a subtraction operation, to obtain a slope voltage signal. The slope voltage signal can be a voltage signal in the form of a triangular wave, or a voltage signal in the form of a trapezoidal wave, or a voltage signal after a combination of a triangle and a trapezoid. This application does not make specific limitations on this. The switch switching circuit 10232 will transmit the slope voltage signal to the integrator 10241.

[0243] The integrator 10241 will generate a drive signal according to the slope voltage signal through an integration operation. During the integration operation, the integrator will also perform a correction process on the laser signal to be emitted according to the slope voltage signal, so that the linearity of the subsequent emitted laser signal will be better. The integrator 10241 will transmit the generated drive signal to the drive amplifier 10242.

[0244] The drive amplifier 10242 will amplify the drive signal and then transmit the amplified drive signal to the laser.

[0245] After receiving the amplified drive signal, the laser 1011 will emit a laser signal again, thus entering the next round of detection and photoelectric phase-locked processing.

[0246] 2. The mixing circuit is composed of four four-phase mixers in parallel.

[0247] As Figure 14A shown, in the photoelectric phase-locked loop 10, the laser 1011 emits a laser signal, and the optical splitter 1012 divides the laser signal into a first optical signal and a second optical signal. The first optical signal is used to detect the target object, and the second optical signal is transmitted to the unequal-arm interferometer 1013. The unequal-arm interferometer 1013 will divide the second optical signal into two paths, one path directly transmits the analog local oscillator signal, and the other path performs a delay process, and then performs a beat frequency process on these two paths of signals to obtain a mixed optical signal. The mixed optical signal is transmitted to the photodetector 1014, and the photodetector 1014 converts the mixed optical signal into an electrical signal and outputs the electrical signal to the single-ended to differential converter 10211.

[0248] The single-ended to differential converter 10211 converts the electrical signal into two paths of electrical signals with initial phases of 0° and 180°. Then, the two paths of electrical signals with 0° and 180° are transmitted to the multi-phase filter 10212. The multi-phase filter 10212 obtains four paths of electrical signals with initial phases of 0°, 90°, 180°, and 270° through the two paths of electrical signals with 0° and 180°. These four paths of electrical signals can be used as the input signals of the first four-phase mixer in the mixing circuit 1022.

[0249] The single-ended to differential converter 10211 transmits four electrical signals with initial phases of 0°, 90°, 180°, and 270° to the 4-phase to 16-phase filter. The 4-phase to 16-phase filter performs vector addition on the four electrical signals with initial phases of 0°, 90°, 180°, and 270° and phase offsets of 22.5°, 45°, and 67.5° respectively to obtain three sets of electrical signals with offset phases of 22.5°, 112.5°, 202.5°, and 292.5°, 45°, 135°, 225°, and 315°, and 67.5°, 157.5°, 247.5°, and 337.5° respectively.

[0250] The four electrical signals with offset phases of 45°, 135°, 225°, and 315° can be used as the input signals of the second four-phase mixer in the mixing circuit 1022.

[0251] The four electrical signals with offset phases of 22.5°, 112.5°, 202.5°, and 292.5° can be used as the input signals of the third four-phase mixer in the mixing circuit 1022.

[0252] The four electrical signals with offset phases of 67.5°, 157.5°, 247.5°, and 337.5° can be used as the input signals of the fourth four-phase mixer in the mixing circuit 1022.

[0253] The four electrical signals with the initial phases and the four electrical signals with the three offset phases are respectively mixed with the corresponding reference signals with the same phases. This process can be referred to Figure 14B for understanding, as Figure 14B follows:

[0254] In the first four-phase mixer, the 0° initial signal is mixed with the 0° reference signal to generate the mixed signal 1, the 90° initial signal is mixed with the 90° reference signal to generate the mixed signal 2, the 180° initial signal is mixed with the 180° reference signal to generate the mixed signal 3, the 270° initial signal is mixed with the 270° reference signal to generate the mixed signal 4. The mixed signal 1 and the mixed signal 2 are added to generate the mixed signal 5 output in the positive phase of the first four-phase mixer; the mixed signal 3 and the mixed signal 4 are added to generate the mixed signal 6 output in the negative phase of the first four-phase mixer.

[0255] In the second four-phase mixer, the 45° offset signal is mixed with the 45° reference signal to generate the mixed signal 7, the 135° offset signal is mixed with the 135° reference signal to generate the mixed signal 8, the 225° offset signal is mixed with the 225° reference signal to generate the mixed signal 9, the 315° offset signal is mixed with the 315° reference signal to generate the mixed signal 10. The mixed signal 7 and the mixed signal 8 are added to generate the mixed signal 11 output in the positive phase of the second four-phase mixer; the mixed signal 9 and the mixed signal 10 are added to generate the mixed signal 12 output in the negative phase of the second four-phase mixer.

[0256] In the third four-phase mixer, the 22.5° offset signal is mixed with the 22.5° reference signal to generate the mixed signal 13, the 112.5° offset signal is mixed with the 112.5° reference signal to generate the mixed signal 14, the 202.5° offset signal is mixed with the 202.5° reference signal to generate the mixed signal 15, and the 292.5° offset signal is mixed with the 292.5° reference signal to generate the mixed signal 16. The mixed signal 13 and the mixed signal 14 are added together to generate the mixed signal 17 which is the positive-phase output of the third four-phase mixer; the mixed signal 15 and the mixed signal 16 are added together to generate the mixed signal 18 which is the anti-phase output of the third four-phase mixer.

[0257] In the fourth four-phase mixer, the 67.5° offset signal is mixed with the 67.5° reference signal to generate the mixed signal 19, the 157.5° offset signal is mixed with the 157.5° reference signal to generate the mixed signal 20, the 247.5° offset signal is mixed with the 247.5° reference signal to generate the mixed signal 21, and the 337.5° offset signal is mixed with the 337.5° reference signal to generate the mixed signal 22. The mixed signal 19 and the mixed signal 20 are added together to generate the mixed signal 23 which is the positive-phase output of the fourth four-phase mixer, and the mixed signal 21 and the mixed signal 22 are added together to generate the mixed signal 24 which is the anti-phase output of the fourth four-phase mixer.

[0258] The first adder adds the mixed signal 5, the mixed signal 11, the mixed signal 17, and the mixed signal 23 to generate the mixed signal 25, which is the final positive-phase output signal, that is, the first output signal.

[0259] The second adder adds the mixed signal 6, the mixed signal 12, the mixed signal 18, and the mixed signal 24 to generate the mixed signal 26, which is the final anti-phase output signal, that is, the second output signal.

[0260] The first output signal and the second output signal are transmitted to the charge pump 10231. The charge pump 10231 converts the first output signal and the second output signal into a single-ended current signal. The conversion process can be to subtract the first output signal and the second output signal, and then convert the single-ended current signal into a target voltage signal. This target voltage signal is transmitted to the switch switching circuit 10232.

[0261] The switch switching circuit 10232 can select the first voltage signal (high voltage signal) or the second voltage signal (low voltage signal) through the switching switch, and then perform an operation on the selected first voltage signal or second voltage signal and the target voltage signal, which can be a subtraction operation, to obtain a slope voltage signal. The slope voltage signal can be a voltage signal in the form of a triangular wave, a trapezoidal wave, or a voltage signal combined by a triangle and a trapezoid. This application does not make specific limitations on this. The switch switching circuit 10232 will transmit the slope voltage signal to the integrator 10241.

[0262] The integrator 10241 will generate a drive signal according to the slope voltage signal through integration operation. During the integration operation, the integrator will also perform correction processing on the laser signal to be emitted according to the slope voltage signal, so that the linearity of the subsequent emitted laser signal will be better. The integrator 10241 will transmit the generated drive signal to the drive amplifier 10242.

[0263] The drive amplifier 10242 will amplify the drive signal and then transmit the amplified drive signal to the laser.

[0264] After receiving the amplified drive signal, the laser 1011 will emit a laser signal again, thus entering the next round of detection and optoelectronic phase-locked processing.

[0265] The embodiment of this application also provides an electrical component applied to the optoelectronic phase-locked loop. The corresponding content of this electrical component can be understood by referring to the corresponding content of the electrical component 102 in the above optoelectronic phase-locked loop, and will not be repeated here.

[0266] The above is only the specific implementation manner of the embodiment of this application, but the protection scope of the embodiment of this application is not limited thereto.

Claims

1. An optoelectronic phase-locked loop, characterized in that, Comprising: An optical component and an electrical component, the electrical component includes a multi-phase signal generator, a mixing circuit, a control circuit, and an integration driving circuit. The multi-phase signal generator is connected to the optical component, and the multi-phase signal generator, the mixing circuit, the control circuit, and the integration driving circuit are connected in sequence, and the integration driving circuit is connected to the optical component; The optical component is used to convert a laser signal into an electrical signal; The multi-phase signal generator is used to convert the electrical signal into electrical signals with 4 different initial phases, and generate at least one set of 4 offset-phase electrical signals with the same phase offset according to the 4 electrical signals with different initial phases. The 4 different initial phases are evenly distributed between 0° and 360°. When there are at least two sets of offset-phase electrical signals, the phase offset of the electrical signals in the same set is the same, and the phase offsets of the electrical signals in different sets are different; The mixing circuit is used to mix the 4 electrical signals with different initial phases with the first reference signals with corresponding phases respectively to obtain 4 initial mixing signals, and mix each set of offset-phase electrical signals with the second reference signals with corresponding phases respectively to obtain at least one set of offset mixing signals. Each set of offset mixing signals includes 4 offset mixing signals. The initial mixing signals after mixing the electrical signals with the initial phases in the first phase space and the offset mixing signals after mixing the electrical signals with the offset phases in the first phase space are superimposed to obtain a first output signal. The initial mixing signals after mixing the electrical signals with the initial phases in the second phase space and the offset mixing signals after mixing the electrical signals with the offset phases in the second phase space are superimposed to obtain a second output signal. The union of the first phase space and the second phase space is 0° to 360°, and the intersection is empty; The control circuit is used to process the first output signal and the second output signal to obtain a slope voltage signal; The integration driving circuit is used to generate a driving signal according to the slope voltage signal, and the driving signal is used to drive the laser signal to be emitted in the optical component.

2. The optoelectronic phase-locked loop according to claim 1, characterized in that, The mixing circuit includes a first four-phase mixer, a second four-phase mixer, a first adder, and a second adder. The first four-phase mixer and the second four-phase mixer are in parallel, and the first adder and the second adder are respectively connected to the first four-phase mixer and the second four-phase mixer. There is one set of offset-phase electrical signals; The first four-phase mixer is used to mix and superimpose two electrical signals with initial phases in the first phase space, and mix and superimpose two electrical signals with initial phases in the second phase space; The second four-phase mixer is used to mix and superimpose two electrical signals with offset phases in the first phase space, and mix and superimpose two electrical signals with offset phases in the second phase space; The first adder superimposes the signal obtained by mixing and superimposing the electrical signal of the initial phase in the first phase space with the signal obtained by mixing and superimposing the electrical signal of the offset phase in the first phase space, so as to obtain a first output signal; The second adder superimposes the signal obtained by mixing and superimposing the electrical signal of the initial phase in the second phase space with the signal obtained by mixing and superimposing the electrical signal of the offset phase in the second phase space, so as to obtain a second output signal.

3. The optoelectronic phase-locked loop according to claim 2, wherein, The four different initial phases are 0°, 90°, 180° and 270° respectively, the phase offset of the electrical signal of the offset phase is 45°, and the offset phases corresponding to each initial phase are 45°, 135°, 225° and 315° respectively; The first four-phase mixer is used to mix four electrical signals of 0°, 90°, 180° and 270° with four first reference signals of 0°, 90°, 180° and 270° in one-to-one correspondence respectively, and superimpose the electrical signal after mixing 0° and the electrical signal after mixing 90° to obtain a first superimposed signal, and superimpose the electrical signal after mixing 180° and the electrical signal after mixing 270° to obtain a second superimposed signal; The second four-phase mixer is used to mix four electrical signals of 45°, 135°, 225° and 315° with four second reference signals of 45°, 135°, 225° and 315° in one-to-one correspondence respectively, and superimpose the electrical signal after mixing 45° and the electrical signal after mixing 135° to obtain a third superimposed signal, and superimpose the electrical signal after mixing 225° and the electrical signal after mixing 315° to obtain a fourth superimposed signal; The first adder is used to superimpose the first superimposed signal and the third superimposed signal to obtain the first output signal; The second adder is used to superimpose the second superimposed signal and the fourth superimposed signal to obtain the second output signal.

4. The optoelectronic phase-locked loop according to claim 1, wherein The mixing circuit includes a first four-phase mixer, a second four-phase mixer, a third four-phase mixer, a fourth four-phase mixer, a first adder and a second adder connected in parallel. The first four-phase mixer, the second four-phase mixer, the third four-phase mixer and the fourth four-phase mixer are connected in parallel. The first adder and the second adder are respectively connected to the first four-phase mixer, the second four-phase mixer, the third four-phase mixer and the fourth four-phase mixer. There are three groups of electrical signals of the offset phase; The first four-phase mixer is used to mix and superimpose two electrical signals of the initial phase in the first phase space, and mix and superimpose two electrical signals of the initial phase in the second phase space; The second four-phase mixer is used to mix and superimpose two electrical signals of the offset phase in the first phase space among the first group of offset-phase electrical signals in the three groups, and mix and superimpose two electrical signals of the offset phase in the second phase space; The third four-phase mixer is used to mix and superimpose two offset-phase electrical signals in the first phase space among the second group of offset-phase electrical signals in the three groups, and mix and superimpose two offset-phase electrical signals in the second phase space; The fourth four-phase mixer is used to mix and superimpose two offset-phase electrical signals in the first phase space among the third group of offset-phase electrical signals in the three groups, and mix and superimpose two offset-phase electrical signals in the second phase space; The first adder superimposes the signal after mixing and superimposing the electrical signals with the initial phase in the first phase space and the signals after mixing and superimposing the offset-phase electrical signals in the first phase space of each group in the three groups to obtain a first output signal; The second adder superimposes the signal after mixing and superimposing the electrical signals with the initial phase in the second phase space and the signals after mixing and superimposing the offset-phase electrical signals in the second phase space of each group in the three groups to obtain a second output signal.

5. The optoelectronic phase-locked loop according to claim 4, characterized in that, The four different initial phases are 0°, 90°, 180°, and 270° respectively, and the phase offset amounts of each group in the three groups are 22.5°, 45°, and 67.5° respectively; the three groups of offset phases corresponding to each initial phase are 22.5°, 112.5°, 202.5°, and 292.5°, 45°, 135°, 225°, and 315°, and 67.5°, 157.5°, 247.5°, and 337.5°; The first four-phase mixer is used to mix four electrical signals of 0°, 90°, 180°, and 270° with four first reference signals of 0°, 90°, 180°, and 270° corresponding one by one, superimpose the electrical signal after mixing 0° and the electrical signal after mixing 90° to obtain a first superimposed signal, and superimpose the electrical signal after mixing 180° and the electrical signal after mixing 270° to obtain a second superimposed signal; The second four-phase mixer is used to mix four electrical signals of 45°, 135°, 225°, and 315° with four second reference signals of 45°, 135°, 225°, and 315° corresponding one by one, superimpose the electrical signal after mixing 45° and the electrical signal after mixing 135° to obtain a third superimposed signal, and superimpose the electrical signal after mixing 225° and the electrical signal after mixing 315° to obtain a fourth superimposed signal; The third four-phase mixer is used to mix four electrical signals of 22.5°, 112.5°, 202.5°, and 292.5° with four second reference signals of 22.5°, 112.5°, 202.5°, and 292.5° corresponding one by one, superimpose the electrical signal after mixing 22.5° and the electrical signal after mixing 112.5° to obtain a fifth superimposed signal, and superimpose the electrical signal after mixing 202.5° and the electrical signal after mixing 292.5° to obtain a sixth superimposed signal; The fourth four-phase mixer is used to mix four electrical signals of 67.5°, 157.5°, 247.5° and 337.5° with four second reference signals of 67.5°, 157.5°, 247.5° and 337.5° respectively, and superimpose the electrical signal after mixing at 67.5° and the electrical signal after mixing at 157.5° to obtain a seventh superimposed signal, and superimpose the electrical signal after mixing at 247.5° and the electrical signal after mixing at 337.5° to obtain an eighth superimposed signal; The first adder is used to superimpose the first superimposed signal, the third superimposed signal, the fifth superimposed signal and the seventh superimposed signal to obtain the first output signal; The second adder is used to superimpose the second superimposed signal, the fourth superimposed signal, the sixth superimposed signal and the eighth superimposed signal to obtain the second output signal.

6. The optoelectronic phase-locked loop according to claim 1, characterized in that, The mixing circuit includes a first two-phase mixer, a second two-phase mixer, a four-phase mixer, a first adder and a second adder. The first two-phase mixer, the second two-phase mixer and the four-phase mixer are connected in parallel. The first adder is connected to the first two-phase mixer and the four-phase mixer. The second adder is connected to the second two-phase mixer and the four-phase mixer. There is a set of electrical signals with an offset phase; The first two-phase mixer is used to mix and superimpose two electrical signals with initial phases located in the first phase space; The second two-phase mixer is used to mix and superimpose two electrical signals with initial phases located in the second phase space; The four-phase mixer is used to mix and superimpose two electrical signals with offset phases located in the first phase space, and mix and superimpose two electrical signals with offset phases located in the second phase space; The first adder superimposes the signal obtained by mixing and superimposing the electrical signal with the initial phase in the first phase space and the signal obtained by mixing and superimposing the electrical signal with the offset phase in the first phase space again to obtain a first output signal; The second adder superimposes the signal obtained by mixing and superimposing the electrical signal with the initial phase in the second phase space and the signal obtained by mixing and superimposing the electrical signal with the offset phase in the second phase space again to obtain a second output signal.

7. The optoelectronic phase-locked loop according to claim 6, wherein The 4 different initial phases are 0°, 90°, 180° and 270° respectively. The phase offset of the electrical signal with the offset phase is 45°. The offset phases corresponding to each initial phase are 45°, 135°, 225° and 315° respectively; The first two-phase mixer is configured to mix two electrical signals with initial phases of 0° and 90° respectively with two first reference signals of 0° and 90° respectively corresponding thereto, and superimpose the electrical signal after 0° mixing and the electrical signal after 90° mixing to obtain a first superimposed signal. The second two-phase mixer is configured to mix two electrical signals with initial phases of 180° and 270° respectively with two first reference signals of 180° and 270° respectively corresponding thereto, and superimpose the electrical signal after 180° mixing and the electrical signal after 270° mixing to obtain a second superimposed signal; The four-phase mixer is configured to mix four electrical signals of 45°, 135°, 225° and 315° respectively with four second reference signals of 45°, 135°, 225° and 315° respectively corresponding thereto, and superimpose the electrical signal after 45° mixing and the electrical signal after 135° mixing to obtain a third superimposed signal, and superimpose the electrical signal after 225° mixing and the electrical signal after 315° mixing to obtain a fourth superimposed signal; The first adder is configured to superimpose the first superimposed signal and the third superimposed signal to obtain the first output signal; The second adder is configured to superimpose the second superimposed signal and the fourth superimposed signal to obtain the second output signal.

8. The optoelectronic phase-locked loop according to any one of claims 1-7, characterized in that, The multi-phase signal generator includes: a single-ended to differential converter, a multi-phase filter and a phase conversion filter; The single-ended to differential converter is configured to convert the electrical signal into two electrical signals with initial phases of 0° and 180°; The multi-phase filter is configured to obtain four electrical signals with initial phases of 0°, 90°, 180° and 270° through the two electrical signals of 0° and 180°; The phase conversion filter is configured to obtain electrical signals of 4 offset phases with the same phase offset amount according to the four electrical signals.

9. The optoelectronic phase-locked loop according to any one of claims 1-7, characterized in that, The control circuit includes a charge pump and a switch switching circuit; The charge pump is configured to process the first output signal and the second output signal into a target voltage signal; The switch switching circuit is configured to control, by switching a switch, a first voltage signal or a second voltage signal that operates with the target voltage signal to obtain the slope voltage signal.

10. The optoelectronic phase-locked loop according to any one of claims 1-7, characterized in that, The integration driving circuit includes an integrator and a driving amplifier; The integrator is configured to generate a driving signal according to the slope voltage signal; The driving amplifier is configured to amplify the driving signal, and the amplified driving signal is used to drive the laser signal to be output by the laser in the optical component.

11. The optoelectronic phase-locked loop according to any one of claims 1-7, characterized in that, The first phase space is [0°, 180°), and the second phase space is [180° to 360°).

12. The optoelectronic phase-locked loop according to any one of claims 1-7, characterized in that, The optical component includes a laser, a beam splitter, an unequal-arm interferometer and a photodetector. The laser, the beam splitter, the unequal-arm interferometer and the photodetector are connected in sequence. The photodetector is connected to the multi-phase signal generator, and the laser is connected to the integration driving circuit; The laser is configured to emit a laser signal; The optical splitter is used to divide the laser signal into a first optical signal and a second optical signal. The first optical signal is used to detect the target object, and the second optical signal is transmitted to the unbalanced interferometer; The unbalanced interferometer is used to generate a mixed optical signal according to the second optical signal; The photodetector is used to convert the mixed optical signal into an electrical signal.

13. An electrical component applied to an optoelectronic phase-locked loop, characterized in that, The photoelectric phase-locked loop includes an optical component and the electrical component. The electrical component includes a multi-phase signal generator, a mixing circuit, a control circuit, and an integration driving circuit. The multi-phase signal generator is connected to the optical component. The multi-phase signal generator, the mixing circuit, the control circuit, and the integration driving circuit are connected in sequence, and the integration driving circuit is connected to the optical component; The multi-phase signal generator is used to convert the electrical signal output by the optical component into electrical signals with 4 different initial phases, and generate at least one set of electrical signals with 4 offset phases having the same phase offset according to the electrical signals with 4 different initial phases. The 4 different initial phases are evenly distributed between 0° and 360°. When there are at least two sets of electrical signals with offset phases, the phase offset of the electrical signals in the same set is the same, and the phase offsets of the electrical signals in different sets are different; The mixing circuit is used to mix the electrical signals with 4 different initial phases and the first reference signals with corresponding phases respectively to obtain 4 initial mixing signals, and mix the electrical signals with offset phases in each group and the second reference signals with corresponding phases respectively to obtain at least one set of offset mixing signals. Each set of offset mixing signals includes 4 offset mixing signals. The initial mixing signals obtained by mixing the electrical signals with initial phases located in the first phase space and the offset mixing signals obtained by mixing the electrical signals with offset phases located in the first phase space are superimposed to obtain a first output signal. The initial mixing signals obtained by mixing the electrical signals with initial phases located in the second phase space and the offset mixing signals obtained by mixing the electrical signals with offset phases located in the second phase space are superimposed to obtain a second output signal. The union of the first phase space and the second phase space is 0° to 360°, and the intersection is empty; The control circuit is used to process the first output signal and the second output signal to obtain a slope voltage signal; The integration driving circuit is used to generate a driving signal according to the slope voltage signal, and the driving signal is used to drive the laser signal to be emitted in the optical component.

14. The electrical component according to claim 13, characterized in that, The mixing circuit includes a first four-phase mixer, a second four-phase mixer, a first adder, and a second adder. The first four-phase mixer and the second four-phase mixer are connected in parallel. The first adder and the second adder are respectively connected to the first four-phase mixer and the second four-phase mixer. There is one set of electrical signals with offset phases; The first four-phase mixer is used to mix and superimpose two electrical signals with initial phases located in the first phase space, and mix and superimpose two electrical signals with initial phases located in the second phase space; The second four-phase mixer is used to mix and superimpose two offset-phase electrical signals located in the first phase space, and to mix and superimpose two offset-phase electrical signals located in the second phase space; The first adder superimposes the signal obtained by mixing and superimposing the electrical signal of the initial phase located in the first phase space and the signal obtained by mixing and superimposing the electrical signal of the offset phase located in the first phase space, so as to obtain a first output signal; The second adder superimposes the signal obtained by mixing and superimposing the electrical signal of the initial phase located in the second phase space and the signal obtained by mixing and superimposing the electrical signal of the offset phase located in the second phase space, so as to obtain a second output signal.

15. The electrical component according to claim 14, characterized in that, The four different initial phases are 0°, 90°, 180°, and 270° respectively, the phase offset of the electrical signal of the offset phase is 45°, and the offset phases corresponding to each initial phase are 45°, 135°, 225°, and 315° respectively; The first four-phase mixer is used to mix four electrical signals of 0°, 90°, 180°, and 270° with four first reference signals of 0°, 90°, 180°, and 270° corresponding one by one, and superimpose the electrical signal after mixing 0° and the electrical signal after mixing 90°, so as to obtain a first superimposed signal, and superimpose the electrical signal after mixing 180° and the electrical signal after mixing 270°, so as to obtain a second superimposed signal; The second four-phase mixer is used to mix four electrical signals of 45°, 135°, 225°, and 315° with four second reference signals of 45°, 135°, 225°, and 315° corresponding one by one, and superimpose the electrical signal after mixing 45° and the electrical signal after mixing 135°, so as to obtain a third superimposed signal, and superimpose the electrical signal after mixing 225° and the electrical signal after mixing 315°, so as to obtain a fourth superimposed signal; The first adder is used to superimpose the first superimposed signal and the third superimposed signal, so as to obtain the first output signal; The second adder is used to superimpose the second superimposed signal and the fourth superimposed signal, so as to obtain the second output signal.

16. The electrical component according to claim 13, characterized in that, The mixing circuit includes a first four-phase mixer, a second four-phase mixer, a third four-phase mixer, a fourth four-phase mixer, a first adder, and a second adder connected in parallel. The first four-phase mixer, the second four-phase mixer, the third four-phase mixer, and the fourth four-phase mixer are connected in parallel. The first adder and the second adder are respectively connected to the first four-phase mixer, the second four-phase mixer, the third four-phase mixer, and the fourth four-phase mixer. There are three groups of electrical signals of the offset phase; The first four-phase mixer is used to mix and superimpose two electrical signals of the initial phase located in the first phase space, and to mix and superimpose two electrical signals of the initial phase located in the second phase space; The second four-phase mixer is configured to mix and superimpose two offset-phase electrical signals located in the first phase space among the electrical signals with offset phases in the first group of the three groups, and mix and superimpose two offset-phase electrical signals located in the second phase space; The third four-phase mixer is configured to mix and superimpose two offset-phase electrical signals located in the first phase space among the electrical signals with offset phases in the second group of the three groups, and mix and superimpose two offset-phase electrical signals located in the second phase space; The fourth four-phase mixer is configured to mix and superimpose two offset-phase electrical signals located in the first phase space among the electrical signals with offset phases in the third group of the three groups, and mix and superimpose two offset-phase electrical signals located in the second phase space; The first adder superimposes the signal obtained by mixing and superimposing the electrical signals with the initial phase in the first phase space and the signals obtained by mixing and superimposing the electrical signals with the offset phases in each of the three groups in the first phase space to obtain a first output signal; The second adder superimposes the signal obtained by mixing and superimposing the electrical signals with the initial phase in the second phase space and the signals obtained by mixing and superimposing the electrical signals with the offset phases in each of the three groups in the second phase space to obtain a second output signal.

17. The electrical component according to claim 16, wherein, The four different initial phases are 0°, 90°, 180°, and 270° respectively, and the phase offset amounts for each of the three groups are 22.5°, 45°, and 67.5° respectively; the three groups of offset phases corresponding to each initial phase are 22.5°, 112.5°, 202.5°, and 292.5°, 45°, 135°, 225°, and 315°, and 67.5°, 157.5°, 247.5°, and 337.5° respectively; The first four-phase mixer is configured to mix four electrical signals of 0°, 90°, 180°, and 270° with four first reference signals of 0°, 90°, 180°, and 270° respectively, superimpose the electrical signal after mixing 0° and the electrical signal after mixing 90° to obtain a first superimposed signal, and superimpose the electrical signal after mixing 180° and the electrical signal after mixing 270° to obtain a second superimposed signal; The second four-phase mixer is configured to mix four electrical signals of 45°, 135°, 225°, and 315° with four second reference signals of 45°, 135°, 225°, and 315° respectively, superimpose the electrical signal after mixing 45° and the electrical signal after mixing 135° to obtain a third superimposed signal, and superimpose the electrical signal after mixing 225° and the electrical signal after mixing 315° to obtain a fourth superimposed signal; The third four-phase mixer is used to mix four electrical signals of 22.5°, 112.5°, 202.5° and 292.5° with four corresponding second reference signals of 22.5°, 112.5°, 202.5° and 292.5° respectively, and superimpose the electrical signal after mixing at 22.5° and the electrical signal after mixing at 112.5° to obtain a fifth superimposed signal, and superimpose the electrical signal after mixing at 202.5° and the electrical signal after mixing at 292.5° to obtain a sixth superimposed signal; The fourth four-phase mixer is used to mix four electrical signals of 67.5°, 157.5°, 247.5° and 337.5° with four corresponding second reference signals of 67.5°, 157.5°, 247.5° and 337.5° respectively, and superimpose the electrical signal after mixing at 67.5° and the electrical signal after mixing at 157.5° to obtain a seventh superimposed signal, and superimpose the electrical signal after mixing at 247.5° and the electrical signal after mixing at 337.5° to obtain an eighth superimposed signal; The first adder is used to superimpose the first superimposed signal, the third superimposed signal, the fifth superimposed signal and the seventh superimposed signal to obtain the first output signal; The second adder is used to superimpose the second superimposed signal, the fourth superimposed signal, the sixth superimposed signal and the eighth superimposed signal to obtain the second output signal.

18. The electrical component according to claim 13, characterized in that, The mixing circuit includes a first two-phase mixer, a second two-phase mixer, a four-phase mixer, a first adder and a second adder. The first two-phase mixer, the second two-phase mixer and the four-phase mixer are connected in parallel. The first adder is connected to the first two-phase mixer and the four-phase mixer. The second adder is connected to the second two-phase mixer and the four-phase mixer. There is a group of electrical signals with offset phases; The first two-phase mixer is used to mix and superimpose two electrical signals with initial phases located in the first phase space; The second two-phase mixer is used to mix and superimpose two electrical signals with initial phases located in the second phase space; The four-phase mixer is used to mix and superimpose two electrical signals with offset phases located in the first phase space, and mix and superimpose two electrical signals with offset phases located in the second phase space; The first adder superimposes the signal obtained by mixing and superimposing the electrical signals with initial phases located in the first phase space and the signal obtained by mixing and superimposing the electrical signals with offset phases located in the first phase space to obtain a first output signal; The second adder superimposes the signal obtained by mixing and superimposing the electrical signals with initial phases located in the second phase space and the signal obtained by mixing and superimposing the electrical signals with offset phases located in the second phase space to obtain a second output signal.

19. The electrical component according to claim 18, characterized in that, The four different initial phases are 0°, 90°, 180°, and 270° respectively. The phase offset of the electrical signal with the offset phase is 45°. The offset phases corresponding to each initial phase are 45°, 135°, 225°, and 315° respectively; The first two-phase mixer is used to mix two electrical signals with initial phases of 0° and 90° respectively with two first reference signals of 0° and 90° corresponding one by one, and superimpose the electrical signals after 0° mixing and the electrical signals after 90° mixing to obtain a first superimposed signal. The second two-phase mixer is used to mix two electrical signals with initial phases of 180° and 270° respectively with two first reference signals of 180° and 270° corresponding one by one, and superimpose the electrical signals after 180° mixing and the electrical signals after 270° mixing to obtain a second superimposed signal; The four-phase mixer is used to mix four electrical signals of 45°, 135°, 225°, and 315° respectively with four second reference signals of 45°, 135°, 225°, and 315° corresponding one by one, and superimpose the electrical signals after 45° mixing and the electrical signals after 135° mixing to obtain a third superimposed signal, and superimpose the electrical signals after 225° mixing and the electrical signals after 315° mixing to obtain a fourth superimposed signal; The first adder is used to superimpose the first superimposed signal and the third superimposed signal to obtain the first output signal; The second adder is used to superimpose the second superimposed signal and the fourth superimposed signal to obtain the second output signal.

20. The electrical component according to any one of claims 13-19, characterized in that, The multi-phase signal generator includes: a single-ended to differential converter, a multi-phase filter, and a phase conversion filter; The single-ended to differential converter is used to convert the electrical signal into two electrical signals with initial phases of 0° and 180°; The multi-phase filter is used to obtain four electrical signals with initial phases of 0°, 90°, 180°, and 270° through the two electrical signals of 0° and 180°; The phase conversion filter is used to obtain electrical signals with 4 offset phases of at least one group of the same phase offset according to the four electrical signals.

21. The electrical component according to any one of claims 13-19, characterized in that, The control circuit includes a charge pump and a switch switching circuit; The charge pump is used to process the first output signal and the second output signal into a target voltage signal; The switch switching circuit is used to control the first voltage signal or the second voltage signal operating with the target voltage signal through a switching switch to obtain the slope voltage signal.

22. The electrical component according to any one of claims 13-19, characterized in that, The integration driving circuit includes an integrator and a driving amplifier; The integrator is used to generate a driving signal according to the slope voltage signal; The driving amplifier is used to amplify the driving signal, and the amplified driving signal is used to drive the laser signal to be output in the optical component.

23. The electrical component according to any one of claims 13-19, characterized in that, The first phase space is [0°, 180°), and the second phase space is [180° to 360°).

24. The electrical component according to any one of claims 13-19, characterized in that, The electrical component is an electrical chip or an electrical chip system.

25. A laser ranging device, characterized in that, It includes a detector and an optoelectronic phase-locked loop; The detector is used to detect the target object; The optoelectronic phase-locked loop is the optoelectronic phase-locked loop described in any one of claims 1-12 above.

26. An electronic device, characterized in that, The electronic device is equipped with the laser ranging device described in claim 25.

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