Device and method for determining signal correlation quantity

Abstract

The embodiment of the invention provides a signal correlation quantity determination device and method, and the method comprises the steps: inputting a first signal to a first electro-optical conversion unit, enabling the first electro-optical conversion unit to modulate light to be modulated according to the inputted first signal, and obtaining a signal to be measured; inputting the second signal to a second electro-optical conversion unit, so that the second electro-optical conversion unit modulates the light to be modulated according to the input second signal to obtain a related signal; determining a first product signal of the signal to be detected and the correlation signal through a photoelectric method or an optical method; and performing electrical averaging operation on the first product signal, and determining the correlation quantity of the signal to be detected and the correlation signal. Therefore, the use of a large-bandwidth multiplier is avoided, and the correlation quantity of the two high-speed signals can be obtained only by using a low-bandwidth electrical device.

Description

Technical Field

[0001] Embodiments of the present application relate to the field of optical communication technologies. Background Art

[0002] In the field of optical communication, in order to achieve a larger communication capacity, the signal rate output by a transmitter is very high, for example, 100 Gbaud. These signals often consist of multiple sub-signals. For example, a dual-polarization system has two polarization components, x and y; a coherent system has an in-phase component I and a quadrature component Q; in a DAC architecture, PAM8 is a superposition of three 0 / 1 sequences, and each 0 / 1 sequence constitutes a sub-signal; in a multi-segment modulation, the total signal is a superposition of signals of each modulation unit (segment), and each modulation unit constitutes a sub-signal. These sub-signals are often generated by different electrical and optical components. If there are deviations in their analog characteristics, it will lead to a reduction in the performance of a high-speed optical transmitter. Therefore, monitoring the characteristics of high-speed signals and sub-signals is a necessary function of a high-speed transmitter. Currently, the acquisition of relevant quantities is a basic method for monitoring the characteristics of high-speed signals / sub-signals.

[0003] It should be noted that the above introduction of the technical background is only for the convenience of clearly and completely explaining the technical solutions of the present application and facilitating the understanding of those skilled in the art. It cannot be considered that the above technical solutions are well-known to those skilled in the art just because these solutions are described in the background art part of the present application. Summary of the Invention

[0004] However, the inventors have found that: for the convenience of applying and processing the monitored high-speed signals / sub-signals, the finally monitored signals still need to be converted into electrical signals for using signal processing algorithms. The basic units of related operations include two parts: multiplication operation and averaging operation. However, since the output signal speed of the transmitter is very high, such as 100 Gbaud, it is very difficult to obtain the relevant quantities of two high-speed signals, especially it is very difficult to directly implement a signal multiplier with a bandwidth of dozens of GHz.

[0005] In view of at least one of the above technical problems, embodiments of the present application provide a device and method for determining signal correlation quantities. By means of electro-optical, opto-electronic, optical, electrical and other technologies, the correlation quantities of two high-speed signals are obtained, with flexible implementation methods and many application scenarios.

[0006] According to one aspect of the embodiments of the present application, a device for determining signal correlation quantities is provided. The device includes:

[0007] A first signal input unit, which is configured to input a first signal to a first electro-optical conversion unit, so that the first electro-optical conversion unit modulates the optical to be modulated according to the input first signal to obtain a signal to be measured;

[0008] A second signal input unit, which is configured to input a second signal into a second electro-optical conversion unit, so that the second electro-optical conversion unit modulates the optical signal to be modulated according to the input second signal to obtain a correlation signal;

[0009] A first signal processing unit, which is configured to determine a first product signal of the signal to be measured and the correlation signal by an optoelectronic method or an optical method;

[0010] A second signal processing unit, which is configured to perform an electrical averaging operation on the first product signal to determine a correlation quantity between the signal to be measured and the correlation signal.

[0011] According to one aspect of the embodiments of the present application, a method for determining a signal correlation quantity is provided. The method includes:

[0012] Input a first signal into a first electro-optical conversion unit, so that the first electro-optical conversion unit modulates the optical signal to be modulated according to the input first signal to obtain a signal to be measured;

[0013] Input a second signal into a second electro-optical conversion unit, so that the second electro-optical conversion unit modulates the optical signal to be modulated according to the input second signal to obtain a correlation signal;

[0014] Determine a first product signal of the signal to be measured and the correlation signal by an optoelectronic method or an optical method;

[0015] Perform an electrical averaging operation on the first product signal to determine a correlation quantity between the signal to be measured and the correlation signal.

[0016] One of the beneficial effects of the embodiments of the present application is that: it avoids using a multiplier with a large bandwidth, and only uses low-bandwidth electrical devices to obtain the correlation quantity of two high-speed signals; the implementation method is flexible and can be implemented in an integrated or non-integrated manner; the application scenarios are rich and suitable for the characteristic monitoring of high-speed signals / sub-signals in various transmitters.

[0017] Referring to the following description and drawings, specific embodiments of the embodiments of the present application are disclosed in detail, indicating the ways in which the principles of the embodiments of the present application can be adopted. It should be understood that the embodiments of the present application are not limited in scope thereby. Within the spirit and terms of the appended claims, the embodiments of the present application include many changes, modifications, and equivalents. Description of the Drawings

[0018] The accompanying drawings included are used to provide a further understanding of the embodiments of the present application, which form a part of the specification, illustrate the implementation manners of the present application, and, together with the written description, explain the principles of the present application. Obviously, the accompanying drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other implementation manners can be obtained based on these drawings without creative efforts. In the drawings:

[0019] Figure 1 is a schematic diagram of a method for determining a signal-related quantity according to an embodiment of the present application;

[0020] Figures 2A to 2E is a schematic diagram of a first electro-optical conversion unit according to an embodiment of the present application;

[0021] Figures 3A to 3E is a schematic diagram of a second electro-optical conversion unit according to an embodiment of the present application;

[0022] Figures 4A to 4D is a schematic diagram of a photoelectric multiplier according to an embodiment of the present application;

[0023] Figures 5A to 5C is a schematic diagram of an electrical averaging unit according to an embodiment of the present application;

[0024] Figure 6 is a schematic diagram of a method for determining a signal-related quantity using an optoelectronic method according to an embodiment of the present application;

[0025] Figures 7 to 10 is provided by an embodiment of the present application to implement Figure 6 a schematic diagram of the hardware structure for the method shown;

[0026] Figure 11 is a schematic diagram of a method for determining a signal-related quantity using an optical method according to an embodiment of the present application;

[0027] Figures 12 to 14 The embodiment of the present application provides a schematic diagram of the hardware structure for implementing Figure 11 the method shown;

[0028] Figure 15 is another schematic diagram of a method for determining a signal-related quantity according to an embodiment of the present application;

[0029] Figure 16 is for implementing an embodiment of the present application Figure 15 a partial schematic diagram of the hardware structure of the method shown;

[0030] Figure 17 is a schematic diagram of a device for determining a signal-related quantity according to an embodiment of the present application;

[0031] Figure 18 is a schematic diagram of an electronic device according to an embodiment of the present application. Detailed implementation manners

[0032] Referring to the accompanying drawings and through the following description, the foregoing and other features of the embodiments of the present application will become apparent. In the description and drawings, specific embodiments of the present application are specifically disclosed, which show some embodiments in which the principles of the embodiments of the present application can be adopted. It should be understood that the present application is not limited to the described embodiments. On the contrary, the embodiments of the present application include all modifications, variations, and equivalents falling within the scope of the appended claims.

[0033] In the embodiments of the present application, terms such as "first", "second", etc. are used to distinguish different elements in terms of name, but do not represent the spatial arrangement or time sequence of these elements, and these elements should not be limited by these terms. The term "and / or" includes any one and all combinations of one or more of the associated listed terms. Terms such as "comprising", "including", "having", etc. mean the presence of the stated features, elements, components, or assemblies, but do not exclude the presence or addition of one or more other features, elements, components, or assemblies.

[0034] In the embodiments of the present application, the singular forms "a", "the", etc. include the plural forms and should be broadly understood as "a kind" or "a class" rather than being limited to the meaning of "one"; in addition, the term "the" should be understood to include both the singular form and the plural form unless the context clearly indicates otherwise. In addition, the term "according to" should be understood as "at least partially according to...", and the term "based on" should be understood as "at least partially based on...", unless the context clearly indicates otherwise.

[0035] Features described and / or illustrated for one embodiment can be used in the same or similar manner in one or more other embodiments, combined with the features in other embodiments, or replace the features in other embodiments. The term "comprising / including" as used herein means the presence of features, whole, steps, or components, but does not exclude the presence or addition of one or more other features, whole, steps, or components.

[0036] Embodiments of the first aspect

[0037] The embodiments of the present application provide a method for determining a signal correlation quantity. Figure 1 is a schematic diagram of the method for determining the signal correlation quantity of the embodiments of the present application. As Figure 1 shown, the method includes:

[0038] 101. Input a first signal into a first electro-optical conversion unit, so that the first electro-optical conversion unit modulates a light to be modulated according to the input first signal to obtain a signal to be measured;

[0039] 102. Input the second signal into the second electro-optical conversion unit, so that the second electro-optical conversion unit modulates the optical signal to be modulated according to the input second signal to obtain a correlation signal;

[0040] 103. Determine the first product signal of the signal to be measured and the correlation signal by an optoelectronic method or an optical method;

[0041] 104. Perform an electrical averaging operation on the first product signal to determine the correlation quantity between the signal to be measured and the correlation signal.

[0042] It should be noted that the above attachments Figure 1 only schematically illustrate the embodiments of the present application, but the present application is not limited thereto. For example, some of the above steps can be executed simultaneously, or can be executed in sequence, the execution order between each operation can be appropriately adjusted, and in addition, some other operations can be added or some of the operations can be reduced. Those skilled in the art can make appropriate modifications according to the above content, not limited to the records in the above attachments Figure 1 only.

[0043] In some embodiments, in step 101, the first signal is the symbol sequence of the first electro-optical conversion unit, which is referred to as the first symbol sequence A[n] in the present application. The first electro-optical conversion unit modulates the optical signal to be modulated input therein according to the first symbol sequence A[n] to obtain a signal to be measured, and the signal to be measured is a high-speed signal and an optical signal. The optical signal to be modulated is, for example, a direct current optical signal, or an optical signal output by the upper-level unit connected to the first electro-optical conversion unit, etc.

[0044] In some embodiments, the first electro-optical conversion unit is a unit that has a modulation function and can generate high-speed signals. For example, the first electro-optical conversion unit is the transmitter itself, or a partial modulation unit of the transmitter. For example, the transmitter includes, but is not limited to, a coherent transmitter, an intensity modulation transmitter, a directly modulated laser, a phase modulator, a combined signal transmitter based on an optical frequency comb, etc.

[0045] Figures 2A to 2E is a schematic diagram of the first electro-optical conversion unit of the embodiment of the present application. Figure 2A shows an IQ modulator with multiple sub-signal branches in a coherent transmitter. Both the I path and the Q path of the IQ modulator have multiple modulation units. Figure 2A In, the first electro-optical conversion unit can be any one of the modulation units in the IQ modulator. For example, it is the modulation unit corresponding to the first symbol sequence A[n] on the I path, that is, the modulation unit into which the first symbol sequence A[n] is input. Figure 2B In, the first electro-optical conversion unit is the modulation unit corresponding to the first symbol sequence A[n] in a segmented intensity modulator. Figure 2CAmong them, the first electro-optical conversion unit is a Directly Modulated Laser (DML) or an External Modulated Laser (EML). Figure 2D Among them, the first electro-optical conversion unit is the modulation unit corresponding to the first symbol sequence A[n] in the segmented phase modulator. Figure 2E Among them, the first electro-optical conversion unit is the EO MOD unit corresponding to the first symbol sequence A[n] in the combined signal transmitter based on an optical frequency comb.

[0046] In some embodiments, when the first electro-optical conversion unit is a laser or a partial modulation unit of a laser, the signal to be measured is correspondingly the output signal of the transmitter or a sub-signal of the transmitter.

[0047] In some embodiments, in step 102, the second signal is the symbol sequence of the second electro-optical conversion unit, which is referred to as the second symbol sequence B[n] in this application. The second electro-optical conversion unit modulates the optical signal to be modulated input thereto according to the second symbol sequence B[n] to obtain a relevant signal, and this relevant signal is also a high-speed signal and an optical signal. The optical signal to be modulated corresponding to the second electro-optical conversion unit and the optical signal to be modulated corresponding to the first electro-optical conversion unit may be the same or different.

[0048] In some embodiments, the second electro-optical conversion unit is a unit that has a modulation function and can generate a high-speed signal. In this application, the second electro-optical conversion unit may be an existing electro-optical conversion unit. Figures 3A to 3E It is a schematic diagram of the second electro-optical conversion unit of the embodiment of this application. Figure 3A Among them, the second electro-optical conversion unit is an MZ type modulator (MZM) with one modulation unit; Figure 3B Among them, the second electro-optical conversion unit is an MZ type modulator (MZM) with two modulation units of equal length; Figure 3C Among them, the second electro-optical conversion unit is an electro-absorption modulator (EAM);

[0049] Figure 3D Among them, the second electro-optical conversion unit is a phase modulator (PM); Figure 3E Among them, the second electro-optical conversion unit is a structure in which an amplitude modulator (such as an MZ type modulator (MZM) or an electro-absorption modulator (EAM)) and a phase modulator (PM) are connected in series.

[0050] In some embodiments, the second electro-optical conversion unit outputs a finite number of states. At this time, the second electro-optical conversion unit outputs a symbol sequence with a finite number of values. For example, the value set of the symbol sequence output by the second electro-optical conversion unit may be {1, -1}, {1, 0} or {1, 0, -1}, etc. For example, for Figure 3AThe second electro-optical conversion unit shown, where the values of the second symbol sequence B[n] input thereto are ±1, and the values of the symbol sequence output therefrom can be {1, -1}, {1, 0} or {1, 0, -1}; for Figure 3B The second electro-optical conversion unit shown, where the values of the second symbol sequence B[n] input thereto are ±1, and the values of the symbol sequence output therefrom can be {1, 0, -1}; for Figure 3C The second electro-optical conversion unit shown, where the values of the second symbol sequence B[n] input thereto are 1 and 0, and the values of the symbol sequence output therefrom can be {1, 0}; for Figure 3D The second electro-optical conversion unit shown, where the values of the second symbol sequence B[n] input thereto are ±1, and the values of the symbol sequence output therefrom can be {1, -1}; for Figure 3E For the second electro-optical conversion unit shown, when it is a structure in which a Mach-Zehnder modulator (MZM) is connected in series with a phase modulator (PM), the values of the second symbol sequence B[n] input to the MZM are ±1, the values of the second symbol sequence B[n] input to the PM are ±1, and the values of the symbol sequence output from the second electro-optical conversion unit can be {1, 0, -1}; when it is a structure in which an electro-absorption modulator (EAM) is connected in series with a phase modulator (PM), the values of the second symbol sequence B[n] input to the EAM are 1 and 0, the values of the second symbol sequence B[n] input to the PM are ±1, and the values of the symbol sequence output from the second electro-optical conversion unit can be {1, 0, -1}.

[0051] When the second electro-optical conversion unit only outputs a finite number of states, the second electro-optical conversion unit only requires logical operations, and the complexity and power consumption of the system are greatly reduced; at the same time, the requirements of the system for the non-linear effects of the second electro-optical conversion unit are also greatly reduced.

[0052] In some embodiments, in step 103, the first product signal of the signal to be measured and the correlation signal is determined by an optoelectronic method.

[0053] And determining the first product signal of the signal to be measured and the correlation signal by an optoelectronic method includes:

[0054] Performing optoelectronic conversion and multiplication operations on the sum of the optical signal of the signal to be measured and the optical signal of the correlation signal to obtain the first product signal.

[0055] As described above, both the signal to be measured output by the first electro-optical conversion unit and the correlation signal output by the second electro-optical conversion unit are optical signals. When using the optoelectronic method, these two optical signals, namely the signal to be measured and the correlation signal, are combined into one optical signal, and then optoelectronic conversion and multiplication operations are performed on the combined optical signal, thereby obtaining the first product signal of the signal to be measured and the correlation signal, and this first product signal is an electrical signal.

[0056] In some embodiments, when determining the first product signal of the signal to be measured and the correlation signal by an optoelectronic method, the first electro-optic conversion unit and the second electro-optic conversion unit are connected in parallel, and the optical signal of the signal to be measured and the optical signal of the correlation signal are respectively output by the first electro-optic conversion unit and the second electro-optic conversion unit.

[0057] In some embodiments, when determining the first product signal of the signal to be measured and the correlation signal by an optoelectronic method, the first electro-optic conversion unit and the second electro-optic conversion unit are modulation units of different modulators. For example, the first electro-optic conversion unit is Figures 2A to 2E any one of the first electro-optic conversion units shown, and the second electro-optic conversion unit is Figures 3A to 3E any one of the second electro-optic conversion units shown. For another example, for a coherent transmitter, it includes two sub-modulators on the I path and the Q path. The first electro-optic conversion unit is a modulation unit on the I path, and the second electro-optic conversion unit is one or more modulation units on the Q path correspondingly; or the first electro-optic conversion unit is a modulation unit on the Q path, and the second electro-optic conversion unit is one or more modulation units on the I path correspondingly.

[0058] In some embodiments, when determining the first product signal of the signal to be measured and the correlation signal by an optoelectronic method, the first electro-optic conversion unit and the second electro-optic conversion unit are different modulation units of the same modulator. For example, for a transmitter including multiple modulation units, one of the modulation units included is used as the first electro-optic conversion unit, and the remaining one or more modulation units are used as the second electro-optic conversion unit. For a coherent transmitter, it includes two sub-modulators on the I path and the Q path. The first electro-optic conversion unit is a modulation unit on the I path, and the second electro-optic conversion unit is the remaining one or more modulation units on the I path correspondingly; or the first electro-optic conversion unit is a modulation unit on the Q path, and the second electro-optic conversion unit is the remaining one or more modulation units on the Q path correspondingly.

[0059] In some embodiments, the optoelectronic method is implemented by an optoelectronic multiplier, where an optoelectronic detector, a balanced detector, a coherent detector, etc. can be used for optoelectronic conversion. Figures 4A to 4D is a schematic diagram of the optoelectronic multiplier according to an embodiment of the present application. Figure 4A In it, the optoelectronic multiplier includes a phase shifter Figure 4B In it, the optoelectronic multiplier includes a phase shifter Figure 4C it, the optoelectronic multiplier includes a phase shifter A beam combiner and a single detector (PD), where the beam combiner is, for example, a 2*1 MMI or a Y beam combiner, etc. Figure 4D In [it], the optoelectronic multiplier includes a phase shifter A 120-degree mixer (120° hybrid) and multiple single detectors (PD), for example, it includes three PDs.

[0060] Figures 4A to 4D In [it], the phase shifter is optional, that is Figures 4A to 4D It may include a phase shifter or may not include a phase shifter.

[0061] Figures 4A to 4D In [it], the optoelectronic multiplier has two input signals, namely signal 1 and signal 2. In this application, one of signal 1 and signal 2 is the signal to be measured output by the first electro-optic conversion unit, and the other of signal 1 and signal 2 is the correlation signal output by the second electro-optic conversion unit. Among the output signals of the optoelectronic multiplier, it includes the product of the signal to be measured and the correlation signal, that is, the first product signal.

[0062] In some embodiments, in step 103, the first product signal of the signal to be measured and the correlation signal is determined by an optical method.

[0063] And determining the first product signal of the signal to be measured and the correlation signal by an optical method includes:

[0064] Performing optoelectronic conversion on the product of the optical signal of the signal to be measured and the optical signal of the correlation signal to obtain the first product signal.

[0065] As mentioned above, both the signal to be measured output by the first electro-optic conversion unit and the correlation signal output by the second electro-optic conversion unit are optical signals. When using an optical method, first multiply these two optical signals of the signal to be measured and the correlation signal to obtain the optical signal of the product of the signal to be measured and the correlation signal, and then perform optoelectronic conversion on the optical signal of the product to obtain the electrical signal of the product of the signal to be measured and the correlation signal, that is, the first product signal.

[0066] In some embodiments, when determining the first product signal of the signal to be measured and the correlation signal by an optical method, the first electro-optic conversion unit and the second electro-optic conversion unit are connected in series, and the product of the optical signal of the signal to be measured and the optical signal of the correlation signal is output after the first electro-optic conversion unit and the second electro-optic conversion unit are connected in series.

[0067] In some embodiments, when determining the first product signal of the signal to be measured and the correlation signal by an optical method, the first electro-optic conversion unit and the second electro-optic conversion unit are modulation units of different modulators. For example, the first electro-optic conversion unit isFigures 2A to 2E any of the first electro-optical conversion units shown, and the second electro-optical conversion unit is Figures 3A to 3E any of the second electro-optical conversion units shown.

[0068] In some embodiments, the optical method is implemented by an optical multiplier. Among them, the structure in which the first electro-optical conversion unit and the second electro-optical conversion unit are connected in series is equivalent to an optical multiplier, which multiplies the signal to be measured and the correlation signal in the optical domain. Therefore, the signal output after the first electro-optical conversion unit and the second electro-optical conversion unit are connected in series is the optical signal of the product of the signal to be measured and the correlation signal. Subsequently, the optical signal of the product of the signal to be measured and the correlation signal is converted into an electrical signal by a photoelectric conversion unit to obtain the first product signal.

[0069] The structure of this photoelectric conversion unit is, for example, similar to that of Figures 4A to 4D the photoelectric multiplier shown. The difference is that when using the optical method, Figures 4A to 4D the photoelectric multiplier is used as the photoelectric conversion unit. At this time, one of its two input signals, signal 1 and signal 2, is the signal output after the first electro-optical conversion unit and the second electro-optical conversion unit are connected in series, that is, the optical signal of the product of the signal to be measured and the correlation signal, and the other is the DC light.

[0070] This photoelectric conversion unit may also be, for example, a single detector (PD). When both the first electro-optical conversion unit and the second electro-optical conversion unit are modulation units of amplitude modulators, the signal to be measured output by the first electro-optical conversion unit and the correlation signal output by the second electro-optical conversion unit are both amplitude modulation signals. The series structure of the first electro-optical conversion unit and the second electro-optical conversion unit multiplies the two amplitude modulation signals of the signal to be measured and the correlation signal to obtain the product of these two signals in the optical domain, that is, the optical signal of the product of the signal to be measured and the correlation signal, which is manifested as a change in the signal amplitude. At this time, the optical signal of this product can be detected by a single detector (PD), and the electrical signal of this product, that is, the first product signal of the signal to be measured and the correlation signal, is output.

[0071] In some embodiments, in step 104, an electrical averaging operation is performed on the first product signal to determine the correlation quantity between the signal to be measured and the correlation signal.

[0072] Among them, the electrical averaging operation can be implemented in the analog domain. For example, the electrical averaging operation on the first product signal can be implemented by an analog circuit; the electrical averaging operation can also be implemented in the digital domain. For example, after the first product signal is subjected to analog-to-digital conversion, the electrical averaging operation on the digital signal corresponding to the first product signal is implemented by a digital circuit.

[0073] In some embodiments, the electrical averaging operation is implemented by an electrical averaging unit. For example, the averaging of a signal is implemented by a low-pass filter or a low-speed DSP. Figures 5A to 5C is a schematic diagram of the electrical averaging unit according to an embodiment of the present application. In Figure 5A , the electrical averaging unit includes two low-pass filters and one low-speed digital signal processor (Low-speed DSP). Figure 5B , the electrical averaging unit includes two filters of electrical devices TIA / DC block and one low-speed digital signal processor (Low-speed DSP). Figure 5C , the electrical averaging unit includes one low-pass filter and one low-speed digital signal processor (Low-speed DSP).

[0074] Hereinafter, the method for determining the signal-related quantity using the optoelectronic method will be specifically described by way of embodiments.

[0075] Figure 6 is a schematic diagram of the method for determining the signal-related quantity using the optoelectronic method according to an embodiment of the present application. Please refer to Figure 1 , when using the optoelectronic method, the first electro-optic conversion unit and the second electro-optic conversion unit are connected in parallel. At this time, the first signal, that is, the first symbol sequence A[n], is input to the first electro-optic conversion unit, so that the first electro-optic conversion unit modulates the light to be modulated 1 and outputs the signal to be measured; the second signal, that is, the second symbol sequence B[n], is input to the second electro-optic conversion unit, so that the second electro-optic conversion unit modulates the light to be modulated 2 and outputs the correlation signal; then the independent signal to be measured and the correlation signal are respectively input to the optoelectronic multiplier, and the optoelectronic multiplier is used for optoelectronic conversion to obtain the first product signal of the signal to be measured and the correlation signal; subsequently, the first product signal is input to the electrical averaging unit, and the electrical averaging unit is used for electrical averaging operation and outputs the correlation quantity of the signal to be measured and the correlation signal.

[0076] Figures 7 to 10 is a schematic diagram of the hardware structure for implementing the Figure 6 method shown in the present application embodiment. The structure includes a first electro-optic conversion unit, a second electro-optic conversion unit, an optoelectronic multiplier, and an electrical averaging unit. Among them, the first electro-optic conversion unit can be Figures 2A to 2E any of the first electro-optic conversion units shown or other structures, the second electro-optic conversion unit can be Figures 3A to 3E any of the second electro-optic conversion units shown or other structures, the optoelectronic multiplier can be Figures 4A to 4D any of the optoelectronic multipliers shown or other structures, and the electrical averaging unit can be Figures 5A to 5C any of the electrical averaging units shown or other structures.

[0077] For example, Figure 7 in the structure shown, the first electro-optic conversion unit adopts Figure 2A the structure shown, the second electro-optic conversion unit adopts Figure 3A the structure shown, the optoelectronic multiplier adopts Figure 4A the structure shown, and the electrical averaging unit adopts Figure 5A the structure shown. Figure 7 In [the structure], the first electro-optic conversion unit is part of the transmitter. The first electro-optic conversion unit and the second electro-optic conversion unit are in parallel, and the multiplication of the signal to be measured and the correlation signal respectively output by the first electro-optic conversion unit and the second electro-optic conversion unit is realized by coherent reception. Therefore, Figure 7 the implementation scheme shown is also called the "parallel modulation + coherent detection" scheme.

[0078] Figure 7 In [the structure], the optical signals to be modulated by the first electro-optic conversion unit and the second electro-optic conversion unit are both DC lights. Before the modulator, a part (such as 95%) of the DC light is delivered to the first electro-optic conversion unit, and another part (such as 5%) is delivered to the second electro-optic conversion unit. Among them, the coherent transmitter has multiple output ports. Therefore, the signal to be measured output by it can be included in the output signal I + jQ of the I + jQ detection end, or included in the output signal I - jQ of the I - jQ detection end, or included in the output signals of other detection branches. The acquisition of the output signal can be realized by a beam splitter. A part (such as 5%) of the output signal is split by the beam splitter and applied in this application. For details, reference can be made to the prior art. Figure 7 Taking the case where the signal to be measured is included in the output signal I - jQ of the I - jQ detection end as an example, but this application is not limited thereto.

[0079] The input of the optoelectronic multiplier is the signal to be measured output by the first electro-optic conversion unit and the correlation signal output by the second electro-optic conversion unit. The output of the optoelectronic multiplier is two electrical signals, namely the in-phase path and the quadrature path. The low-pass filtering of the electrical signals and the low-speed DSP constitute the electrical averaging unit. The electrical averaging operation can be realized in the analog domain or the digital domain.

[0080] Figure 7 The principle of determining the correlation quantity by the structure shown is as follows:

[0081] Denote the output signal of the coherent transmitter including the first electro-optic conversion unit as E Sig (t), which includes the signal to be measured E1(t) output by the first electro-optic conversion unit. The correlation signal output by the second electro-optic conversion unit is E2(t). The optical phase difference between E Sig (t) and E2(t) is After passing through an ideal 90-degree mixer (90° hybrid), the output optical signal can be expressed as:

[0082]

[0083] Subsequently, the output currents of the two balanced photodetectors (BPDs) can be written respectively as:

[0084]

[0085]

[0086] In the above formula, R BPD is the response of the balanced photodetector, is a constant phase. Since E sig (t) contains E1(t), the I BPD1 (t) and I BPD2 (t) output by the photomultiplier contain the information of E1(t)E2(t). Through the electrical averaging unit, the correlation of the two high-speed signals can be obtained.

[0087] In some embodiments, the second electro-optical conversion unit and the first electro-optical conversion unit are on the same modulator. As Figure 8 shown, the first electro-optical conversion unit adopts the structure shown in Figure 2A . On the modulator where the first electro-optical conversion unit is located, an additional modulation section can be added as the second electro-optical conversion unit, that is, the modulation unit that inputs the second symbol sequence B[n] in Figure 8 . Taking the structure shown in Figure 8 as an example, both the first electro-optical conversion unit and the second electro-optical conversion unit convert high-speed electrical signals into optical phase information, that is, the signal to be measured and the correlation signal. After the phases of the two signals are superimposed, they are output through the MZ modulator. The photomultiplier is implemented by a single detector (PD), and the square operation of the PD multiplies the two signals. The electrical averaging operation is implemented by the electrical averaging unit shown in Figure 5C .

[0088] In Figure 8 the shown scheme, one modulation section is used as the second electro-optical conversion unit. In some other embodiments, if the influence of the correlation signal on the main signal is not considered, other available modulation sections on the modulator where the first electro-optical conversion unit is located can be used as the second electro-optical conversion unit, as shown in Figure 9 .

[0089] In some embodiments, the second electro-optical conversion unit and the first electro-optical conversion unit are on different modulators. As Figure 10 shown, the first electro-optical conversion unit adopts the structure shown in Figure 2AThe structure shown is such that the first electro-optical conversion unit is a modulation unit on a sub-modulator of a branch of a coherent transmitter. The second electro-optical conversion unit employs one or more modulation units on a sub-modulator of another branch of the coherent transmitter. When the first electro-optical conversion unit is a certain modulation segment on the I path of the coherent transmitter, the second electro-optical conversion unit is one or more modulation segments on the Q path of the coherent transmitter, and vice versa. In Figure 10 it is required that the I path and the Q path of the coherent transmitter are not orthogonal, that is, the phase difference (phase bias) between the I path and the Q path is not equal to 90° or -90°, and for example, it can be 0°.

[0090] The following will specifically describe the method for determining the signal correlation quantity using an optical method through embodiments.

[0091] Figure 11 is a schematic diagram of the method for determining the signal correlation quantity using an optical method in an embodiment of the present application. Please combine Figure 11 , when using an optical method, the first electro-optical conversion unit and the second electro-optical conversion unit are connected in series to form an optical multiplier. At this time, the first signal, that is, the first symbol sequence A[n], is input to the first electro-optical conversion unit to cause the first electro-optical conversion unit to modulate the light to be modulated 3 to form a signal to be measured; the second signal, that is, the second symbol sequence B[n], is input to the second electro-optical conversion unit to cause the second electro-optical conversion unit to modulate the light to be modulated 4 to form a correlation signal. As Figure 11 shown, when the output end of the first electro-optical conversion unit is connected in series with the input end of the second electro-optical conversion unit, the light to be modulated 3 can be direct current light, and the light to be modulated 4 includes the signal to be measured output by the first electro-optical conversion unit; conversely, when the output end of the second electro-optical conversion unit is connected in series with the input end of the first electro-optical conversion unit (not shown), the light to be modulated 4 can be direct current light, and the light to be modulated 3 includes the correlation signal output by the second electro-optical conversion unit. Since the first electro-optical conversion unit and the second electro-optical conversion unit are connected in series to form an optical multiplier, therefore, this series structure will output the product of the signal to be measured and the correlation signal in the optical domain, that is, the optical signal of the product of the signal to be measured and the correlation signal; then the optical signal of the product of the signal to be measured and the correlation signal is input to the photoelectric conversion unit, and the photoelectric conversion unit is used for photoelectric conversion to obtain the electrical signal of the product of the signal to be measured and the correlation signal, that is, the first product signal of the signal to be measured and the correlation signal; subsequently, the first product signal is input to the electrical averaging unit, and the electrical averaging unit is used for electrical averaging operation and outputs the correlation quantity of the signal to be measured and the correlation signal.

[0092] Figures 12 to 10 provided by an embodiment of the present application to achieve Figure 11Schematic diagram of the hardware structure of the method shown. This structure includes a first electro-optic conversion unit, a second electro-optic conversion unit, a photoelectric conversion unit, and an electrical averaging unit. Among them, the first electro-optic conversion unit can be Figures 2A to 2E any of the first electro-optic conversion units shown or other structures, and the second electro-optic conversion unit can be Figures 3A to 3E any of the second electro-optic conversion units shown or other structures, and the photoelectric conversion unit can be Figures 4A to 4D the structure of any photoelectric multiplier shown or other structures, and the electrical averaging unit can be Figures 5A to 5C any of the electrical averaging units shown or other structures.

[0093] For example, Figure 12 in the structure shown, the first electro-optic conversion unit adopts Figure 2A the structure shown, the second electro-optic conversion unit adopts Figure 3A the structure shown, the photoelectric conversion unit adopts Figure 4A the structure shown, and the electrical averaging unit adopts Figure 5B the structure shown. Figure 12 In, the first electro-optic conversion unit is part of a coherent transmitter. The first electro-optic conversion unit and the second electro-optic conversion unit are in series, forming an optical multiplier, so that the signal to be measured and the correlation signal are multiplied in the optical domain. Before the modulator, a part (such as 95%) of the DC light is delivered to the first electro-optic conversion unit, and the first electro-optic conversion unit forms the signal to be measured. The signal to be measured is included in the output signal of the output port (such as the I + jQ detection end or the I - jQ detection end or other detection ends) of the coherent transmitter. The input end of the second electro-optic conversion unit is connected to the corresponding output port of the coherent transmitter, and modulates the input signal containing the signal to be measured, and then outputs the product of the signal to be measured and the correlation signal in the optical domain.

[0094] The two inputs of the photoelectric conversion unit are respectively the product of the signal to be measured and the correlation signal in the optical domain and a part (such as 5%) of the DC light that is split off.

[0095] Figure 12 The implementation scheme shown is also called the "series modulation + coherent detection" scheme.

[0096] Again, for example, Figure 13 in the structure shown, the first electro-optic conversion unit adopts Figure 2A the structure shown, the second electro-optic conversion unit adopts Figure 3A the structure shown, the photoelectric conversion unit adopts a single detector (PD), and the electrical averaging unit adopts Figure 5C the structure shown. Figure 13In [the figure], the first electro-optical conversion unit and the second electro-optical conversion unit are connected in series and form an optical multiplier through a waveguide structure, so that the signal to be measured and the correlation signal are multiplied in the optical domain. A single detector (PD) realizes the optoelectronic conversion function and obtains the electrical signal of the product of the signal to be measured and the correlation signal, that is, the first product signal. The electrical averaging unit performs an electrical averaging operation on the first product signal and outputs the correlation quantity of the signal to be measured and the correlation signal.

[0097] Figure 13 The implementation scheme shown is also called the "series modulation + direct detection" scheme.

[0098] Figure 12 and Figure 13 The optical multiplier in [the figure] is implemented as follows:

[0099] Taking Figure 13 as an example, assuming that all beam combiners MMI in the coherent transmitter use 2*2 MMI, the signals at the two output ports of the I-channel modulator can be written as and is the optical phase modulated by the I-channel electrical signal.

[0100] The main output signal of the IQ modulator is the signal at one path after the 2*2 MMI of the mother MZ and can be simplified as: The other output is The output signals at the other ports of the I modulator and the Q modulator can also be combined with a phase shifter and a 2*2 MMI to obtain the signal Combining these two signals with a beam combiner, the following signal can be obtained:

[0101]

[0102] Equation (13-1) shows that through optical methods, two amplitude modulation signals (equivalent to the signals output by a modulator biased at the quadrature point) can be constructed, which act as the real and imaginary parts of the total output signal.

[0103] At the same time, the second electro-optical conversion unit can also output an amplitude modulation signal (such as an MZ modulator biased at the quadrature point).

[0104] For another example, Figure 14 in the structure shown, the first electro-optical conversion unit adopts the structure shown in Figure 2C the second electro-optical conversion unit adopts the structure shown in Figure 3A , Figure 3B or Figure 3C the structure shown, the optoelectronic conversion unit adopts a single detector (PD), and the electrical averaging unit adopts Figure 5CThe structure shown. Figure 14 In it, the first electro-optic conversion unit and the second electro-optic conversion unit are connected in series to form an optical multiplier, so that the signal to be measured and the correlation signal are multiplied in the optical domain. A single detector (PD) realizes the photoelectric conversion function to obtain the electrical signal of the product of the signal to be measured and the correlation signal, that is, the first product signal. The electrical averaging unit performs an electrical averaging operation on the first product signal and outputs the correlation quantity of the signal to be measured and the correlation signal.

[0105] Before the modulator, a part (such as 95%) of the DC light is delivered to the first electro-optic conversion unit, and the first electro-optic conversion unit forms the signal to be measured. The signal to be measured is included in the output signal of the output port of the coherent transmitter (such as the I + jQ detection end or the I - jQ detection end or other detection ends). The input end of the second electro-optic conversion unit is connected to the corresponding output port of the coherent transmitter, and modulates the input signal including the signal to be measured, and then outputs the product of the signal to be measured and the correlation signal in the optical domain.

[0106] Through the above embodiments, the present application determines the product of the high-speed signals output by the two electro-optic conversion units by an optical method or an optoelectronic method, and further obtains the correlation quantity of the two high-speed signals through an electrical averaging operation. Through the present application, it is possible to avoid using a multiplier with a large bandwidth, and only use low-bandwidth electrical devices to obtain the correlation quantity of the two high-speed signals; the implementation method is flexible and can be implemented in an integrated or non-integrated manner; the application scenarios are rich and suitable for the characteristic monitoring of high-speed signals / sub-signals in various transmitters.

[0107] Figure 15 is a schematic diagram of the method for determining the correlation quantity of the signals in the embodiments of the present application, as Figure 15 shown, the method includes:

[0108] 1501, input the first signal into the first electro-optic conversion unit, and enable the first electro-optic conversion unit to modulate the light to be modulated according to the input first signal to obtain the signal to be measured;

[0109] 1502, multiply the second signal by a low-frequency square wave to obtain a second product signal;

[0110] 1503, input the second product signal into the second electro-optic conversion unit, and enable the second electro-optic conversion unit to modulate the light to be modulated according to the input second product signal to obtain the correlation signal;

[0111] 1504, determine the first product signal of the signal to be measured and the correlation signal by an optoelectronic method or an optical method;

[0112] 1505, multiply the first product signal by the low-frequency square wave to obtain a third product signal;

[0113] In 1506, an electrical averaging operation is performed on the third product signal obtained by multiplying the first product signal by the low-frequency square wave to determine the correlation quantity between the signal to be measured and the correlation signal.

[0114] It should be noted that the above appendix Figure 15 only schematically illustrates the embodiments of the present application, but the present application is not limited thereto. For example, some of the above steps can be executed simultaneously or in a sequential order. The execution order between various operations can be appropriately adjusted. In addition, some other operations can be added or some of the operations can be reduced. Those skilled in the art can make appropriate modifications according to the above content, not limited to the records in the above appendix Figure 15 .

[0115] In some embodiments, in step 1501, the first signal is the input symbol sequence of the first electro-optic conversion unit, that is, the first input symbol sequence A[n]. The first electro-optic conversion unit is the transmitter itself or a partial modulation unit of the transmitter. The first electro-optic conversion unit is, for example, Figures 2A to 2E the structure shown or other structures. The signal to be measured is a high-speed signal and an optical signal. For the content related to the first signal, the first electro-optic conversion unit, and the signal to be measured, please refer to the implementation of step 101.

[0116] In some embodiments, in step 1502, the second signal is multiplied by the low-frequency square wave, which can be implemented by a multiplier, for example. Figure 16 is a partial schematic diagram of the hardware structure for implementing the method of the embodiments of the present application Figure 15 shown. As Figure 16 shown, the second signal B[n] is multiplied by the low-frequency square wave, and then the product of B[n] and the low-frequency square wave is used as the symbol sequence of the second electro-optic conversion unit and input into the second electro-optic conversion unit. Although Figure 16 the hardware structures such as the first electro-optic conversion unit, the second electro-optic conversion unit, and the optoelectronic multiplier / optoelectronic conversion unit are not shown, those skilled in the art should understand that Figure 16 can be combined with any of the hardware structures shown in Figures 7 to 10 , Figures 12 to 14 .

[0117] In some embodiments, in step 1503, the second electro-optic conversion unit is, for example, Figures 3A to 3E the structure shown or other structures. The correlation signal is also a high-speed signal and an optical signal. For the content related to the second signal, the second electro-optic conversion unit, and the correlation signal, please refer to the implementation of step 102.

[0118] In some embodiments, in step 1504, a first product signal of the signal to be measured and the correlation signal is determined by an optoelectronic method. The sum of the optical signal of the signal to be measured and the optical signal of the correlation signal is subjected to optoelectronic conversion and multiplication operations to obtain the first product signal. When using the optoelectronic method, the first electro-optic conversion unit and the second electro-optic conversion unit are connected in parallel, and the optoelectronic conversion and multiplication operations of the signal to be measured and the correlation signal can be realized by an optoelectronic multiplier. For the content related to the implementation of the optoelectronic method and the optoelectronic multiplier, please refer to the implementation of step 103.

[0119] In some embodiments, in step 1504, a first product signal of the signal to be measured and the correlation signal is determined by an optical method. The product of the optical signal of the signal to be measured and the optical signal of the correlation signal is subjected to optoelectronic conversion to obtain the first product signal. When using the optoelectronic method, the first electro-optic conversion unit and the second electro-optic conversion unit are connected in series to form an optical multiplier to realize the multiplication of the signal to be measured and the correlation signal in the optical domain. In addition, the optoelectronic conversion of the product of the signal to be measured and the correlation signal can be realized by an optoelectronic conversion unit. For the content related to the implementation of the optical method and the optoelectronic conversion unit, please refer to the implementation of step 103.

[0120] In some embodiments, in step 1505, the first product signal is multiplied by the low-frequency square wave to obtain a third product signal, which can be realized by a multiplier, for example. The low-frequency square wave in this step is the same low-frequency square wave as that in step 1052.

[0121] In some embodiments, in step 1506, an electrical averaging operation is performed on the third product signal obtained by multiplying the first product signal by the low-frequency square wave to determine the correlation quantity between the signal to be measured and the correlation signal. The electrical averaging operation can be realized by an electrical averaging unit, and the multiplier in step 1505 can be arranged in the electrical averaging unit. For example, please refer to Figure 16 , taking Figure 5A the electrical averaging unit shown as an example. A multiplier is arranged between the low-pass filter (Filter) and the low-speed digital signal processor (Low-speed DSP) of the electrical averaging unit. The two inputs of the multiplier are respectively the low-frequency square wave and the first product signal of the signal to be measured and the correlation signal, and the output is the above-mentioned third product signal. The low-speed digital signal processor (Low-speed DSP) performs an electrical averaging operation on the third product signal to obtain the correlation quantity between the signal to be measured and the correlation signal. For the content related to the electrical averaging unit and determining the correlation quantity between the signal to be measured and the correlation signal, please refer to the implementation of step 104.

[0122] Through the above embodiments, in the method for determining the signal-related quantity, the present application adds a step of multiplying a square wave to shift the frequency, that is, using the second product signal obtained by multiplying a low-frequency square wave with a symbol sequence as the symbol sequence of the second electro-optic conversion unit, and performing an electrical averaging operation on the third product signal obtained by multiplying the first product signal of the signal to be measured and the correlation signal with the low-frequency square wave in the electrical averaging operation to obtain the correlation quantity between the signal to be measured and the correlation signal. After adding the step of multiplying the square wave to shift the frequency, the calculated correlation quantity can be transferred from DC to the frequency of the low-frequency square wave, thereby avoiding the 1 / f noise near DC.

[0123] The above has schematically described the method for determining the signal-related quantity and the hardware structure for implementing this method, but the present application is not limited thereto. The determination of the signal-related quantity may also include other steps or processes. For the specific content of these steps or processes, reference may be made to the prior art. In addition, the above has made an exemplary description of the hardware structure for implementing the method for determining the signal-related quantity, but the present application is not limited to these hardware structures, and these structures may also be appropriately modified, and the implementation manners of these modifications should all be included within the scope of the embodiments of the present application.

[0124] Each of the above embodiments only makes an exemplary description of the embodiments of the present application, but the present application is not limited thereto, and appropriate modifications may also be made on the basis of each of the above embodiments. For example, each of the above embodiments may be used alone, or one or more of the above embodiments may be combined.

[0125] As can be seen from the above embodiments, the present application determines the product of the high-speed signals output by two electro-optic conversion units by an optical method or an optoelectronic method, and further obtains the correlation quantity between these two high-speed signals through an electrical averaging operation. Through the present application, it is possible to avoid using a multiplier with a large bandwidth, and only use low-bandwidth electrical devices to obtain the correlation quantity between two high-speed signals; the implementation method is flexible and can be implemented in an integrated or non-integrated manner; the application scenarios are rich and suitable for the characteristic monitoring of high-speed signals / sub-signals in various transmitters. In addition, the function of multiplying a square wave to shift the frequency can also be added to transfer the correlation quantity from DC to the frequency of the low-frequency square wave, thereby avoiding the 1 / f noise near DC.

[0126] Embodiments of the second aspect

[0127] The embodiments of the present application provide a device for determining a signal-related quantity. The same content as that in the embodiments of the first aspect will not be repeated.

[0128] Figure 17 is a schematic diagram of the device for determining the signal-related quantity in the embodiments of the present application. As Figure 17 shown, the device 1700 for determining the signal-related quantity includes:

[0129] A first signal input unit 1701, which is configured to input a first signal into a first electro-optic conversion unit, so that the first electro-optic conversion unit modulates the optical signal to be modulated according to the input first signal to obtain a signal to be measured;

[0130] A second signal input unit 1702, which is configured to input a second signal into a second electro-optic conversion unit, so that the second electro-optic conversion unit modulates the optical signal to be modulated according to the input second signal to obtain a correlation signal;

[0131] A first signal processing unit 1703, which is configured to determine a first product signal of the signal to be measured and the correlation signal by an optoelectronic method or an optical method;

[0132] A second signal processing unit 1704, which is configured to perform an electrical averaging operation on the first product signal to determine a correlation quantity between the signal to be measured and the correlation signal.

[0133] In some embodiments, the first electro-optic conversion unit is a transmitter or a partial modulation unit of a transmitter.

[0134] In some embodiments, the second electro-optic conversion unit outputs a finite number of states.

[0135] In some embodiments, the first electro-optic conversion unit and the second electro-optic conversion unit are connected in parallel;

[0136] And the first electro-optic conversion unit and the second electro-optic conversion unit respectively output an optical signal of the signal to be measured and an optical signal of the correlation signal.

[0137] In some embodiments, the first signal processing unit 1703 includes an optical multiplier, and the optical multiplier is configured to:

[0138] Perform optoelectronic conversion and multiplication operations on the sum of the optical signal of the signal to be measured and the optical signal of the correlation signal to obtain the first product signal.

[0139] In some embodiments, the first electro-optic conversion unit and the second electro-optic conversion unit are modulation units of different modulators; or

[0140] The first electro-optic conversion unit and the second electro-optic conversion unit are different modulation units of the same modulator.

[0141] In some embodiments, the first electro-optic conversion unit and the second electro-optic conversion unit are connected in series;

[0142] And after the first electro-optic conversion unit and the second electro-optic conversion unit are connected in series, they output a product of the optical signal of the signal to be measured and the optical signal of the correlation signal.

[0143] In some embodiments, the first signal processing unit 1703 includes a photoelectric conversion unit, and the photoelectric conversion unit is configured to:

[0144] perform photoelectric conversion on the product of the optical signal of the signal to be measured and the optical signal of the correlation signal to obtain the first product signal.

[0145] In some embodiments, the first electro-optic conversion unit and the second electro-optic conversion unit are modulation units of different modulators.

[0146] In some embodiments, the device further includes (not shown):

[0147] a first multiplication unit, which is configured to multiply the second signal by a low-frequency square wave to obtain a second product signal before inputting the second signal to the second electro-optic conversion unit;

[0148] And the second signal input unit 1702 is specifically configured to:

[0149] input the second product signal into the second electro-optic conversion unit, so that the second electro-optic conversion unit modulates the optical signal to be modulated according to the second product signal to obtain the correlation signal.

[0150] In some embodiments, the device further includes (not shown):

[0151] a second multiplication unit, which is configured to multiply the first product signal by the low-frequency square wave to obtain a third product signal before performing an electrical averaging operation on the first product signal;

[0152] And the second signal processing unit 1704 includes an electrical averaging unit, and the electrical averaging unit is specifically configured to:

[0153] perform an electrical averaging operation on the third product signal obtained by multiplying the first product signal by the low-frequency square wave to determine the correlation quantity between the signal to be measured and the correlation signal.

[0154] It should be noted that only the components or modules related to the present application are described above, but the present application is not limited thereto. The device 1700 for determining the signal correlation quantity may further include other components or modules. For the specific content of these components or modules, reference may be made to related technologies.

[0155] For simplicity, Figure 17 only the connection relationships or signal directions between the various components or modules are exemplarily shown, but those skilled in the art should clearly understand that various related technologies such as bus connection can be adopted. The above-mentioned various components or modules can be implemented by hardware facilities such as a processor and a memory; the embodiments of the present application do not limit this.

[0156] The above embodiments only exemplarily illustrate the embodiments of the present application, but the present application is not limited thereto, and appropriate modifications can be made on the basis of the above embodiments. For example, the above embodiments can be used alone, or one or more of the above embodiments can be combined.

[0157] As can be seen from the above embodiments, the present application determines the product of high-speed signals output by two electro-optical conversion units through an optical method or an optoelectronic method, and further obtains the correlation quantity of these two high-speed signals through an electrical averaging operation. Through the present application, the use of a large-bandwidth multiplier can be avoided, and the correlation quantity of two high-speed signals can be obtained only by using low-bandwidth electrical devices; the implementation method is flexible and can be implemented in an integrated or non-integrated manner; the application scenarios are rich and suitable for the characteristic monitoring of high-speed signals / sub-signals in various transmitters. In addition, the function of multiplying the square wave and frequency shifting can be added to transfer the correlation quantity from direct current to the frequency of the low-frequency square wave, thereby avoiding the 1 / f noise near direct current.

[0158] Embodiments of the third aspect

[0159] The embodiments of the present application provide an electronic device, including a determining device 1700 for signal correlation quantity as described in the embodiments of the second aspect, the content of which is incorporated herein. The electronic device can be, for example, a computer, a server, a workstation, a laptop computer, a smart phone, etc.; however, the embodiments of the present application are not limited thereto.

[0160] Figure 18 is a schematic diagram of the electronic device according to the embodiments of the present application. As Figure 18 shown, the electronic device 1800 may include: a processor (such as a central processing unit CPU) 1810 and a memory 1820; the memory 1820 is coupled to the central processor 1810. The memory 1820 can store various data; in addition, a program 1821 for information processing is stored, and the program 1821 is executed under the control of the processor 1810.

[0161] In some embodiments, the function of the determining device 1700 for signal correlation quantity is integrated into the processor 1810. Among them, the processor 1810 is configured to implement the method for determining the signal correlation quantity as described in the embodiments of the first aspect.

[0162] In some embodiments, the determining device 1700 for signal correlation quantity is separately configured from the processor 1810. For example, the determining device 1700 for signal correlation quantity can be configured as a chip connected to the processor 1810, and the function of the determining device 1700 for signal correlation quantity is realized through the control of the processor 1810.

[0163] For example, the processor 1810 is configured to perform the following control:

[0164] Input the first signal into the first electro-optic conversion unit, so that the first electro-optic conversion unit modulates the light to be modulated according to the input first signal to obtain a signal to be measured; input the second signal into the second electro-optic conversion unit, so that the second electro-optic conversion unit modulates the light to be modulated according to the input second signal to obtain a correlation signal; determine the first product signal of the signal to be measured and the correlation signal by an optoelectronic method or an optical method; perform an electrical averaging operation on the first product signal to determine the correlation quantity between the signal to be measured and the correlation signal.

[0165] In addition, as Figure 18 shown, the electronic device 1800 may further include: an input / output (I / O) device 1830, a display 1840, etc.; among them, the functions of the above components are similar to those in the prior art and will not be elaborated here. It should be noted that the electronic device 1800 does not necessarily have to include Figure 18 all the components shown in Figure 18 ; in addition, the electronic device 1800 may further include components not shown in

[0166] The embodiment of the present application further provides a computer-readable program, wherein when the program is executed in an electronic device, the program causes the computer to execute the method for determining the correlation quantity of signals as described in the embodiment of the first aspect in the electronic device.

[0167] The embodiment of the present application further provides a storage medium storing a computer-readable program, wherein the computer-readable program causes the computer to execute the method for determining the correlation quantity of signals as described in the embodiment of the first aspect in the electronic device.

[0168] The above device and method of the present application can be implemented by hardware or by a combination of hardware and software. The present application relates to such a computer-readable program, which when executed by a logic component, can enable the logic component to implement the above-mentioned device or component, or enable the logic component to implement the above-mentioned various methods or steps. The present application also relates to a storage medium for storing the above program, such as a hard disk, a magnetic disk, an optical disk, a DVD, a flash memory, etc.

[0169] The method / apparatus described in combination with the embodiments of the present application can be directly embodied as hardware, a software module executed by a processor, or a combination of both. For example, one or more of the functional block diagrams shown in the figures and / or a combination of one or more of the functional block diagrams can correspond to each of the software modules in the computer program flow, and can also correspond to each of the hardware modules. These software modules can respectively correspond to the respective steps shown in the figures. These hardware modules can be implemented, for example, by using a field-programmable gate array (FPGA) to solidify these software modules.

[0170] The software module can be located in a RAM memory, a flash memory, a ROM memory, an EPROM memory, an EEPROM memory, a register, a hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art. A storage medium can be coupled to the processor so that the processor can read information from the storage medium and write information to the storage medium; or the storage medium can be a component of the processor. The processor and the storage medium can be located in an ASIC. The software module can be stored in the memory of the mobile terminal or in a memory card that can be inserted into the mobile terminal. For example, if the device (such as a mobile terminal) uses a larger-capacity MEGA-SIM card or a large-capacity flash memory device, the software module can be stored in the MEGA-SIM card or the large-capacity flash memory device.

[0171] One or more of the functional block diagrams described in the accompanying drawings and / or a combination of one or more of the functional block diagrams can be implemented as a general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or other programmable logic device, discrete gate or transistor logic device, discrete hardware component, or any suitable combination thereof for performing the functions described in the present application. One or more of the functional block diagrams described in the accompanying drawings and / or a combination of one or more of the functional block diagrams can also be implemented as a combination of computing devices, for example, a combination of a DSP and a microprocessor, multiple microprocessors, one or more microprocessors in communication combination with a DSP, or any other such configuration.

[0172] The present application has been described in combination with specific embodiments, but those skilled in the art should understand that these descriptions are exemplary and not a limitation on the protection scope of the present application. Those skilled in the art can make various variations and modifications to the present application based on the principles of the present application, and these variations and modifications are also within the scope of the present application.

[0173] Regarding the embodiments including the above embodiments, the following supplementary notes are also disclosed:

[0174] Supplementary Note 1. A method for determining a signal-related quantity, the method comprising:

[0175] Input a first signal into a first electro-optical conversion unit, such that the first electro-optical conversion unit modulates the optical signal to be modulated according to the input first signal to obtain a signal to be measured;

[0176] Input a second signal into a second electro-optical conversion unit, such that the second electro-optical conversion unit modulates the optical signal to be modulated according to the input second signal to obtain a correlation signal;

[0177] Determine a first product signal of the signal to be measured and the correlation signal by an optoelectronic method or an optical method;

[0178] Perform an electrical averaging operation on the first product signal to determine a correlation quantity between the signal to be measured and the correlation signal.

[0179] Remark 2. The method according to Remark 1, wherein the first electro-optical conversion unit is a transmitter or a partial modulation unit of a transmitter.

[0180] Remark 3. The method according to Remark 1, wherein the second electro-optical conversion unit outputs a finite number of states.

[0181] Remark 4. The method according to Remark 1, wherein determining the first product signal of the signal to be measured and the correlation signal by an optoelectronic method includes:

[0182] Perform optoelectronic conversion and multiplication operations on the sum of the optical signal of the signal to be measured and the optical signal of the correlation signal to obtain the first product signal;

[0183] Wherein, the first electro-optical conversion unit and the second electro-optical conversion unit are in parallel, and the optical signal of the signal to be measured and the optical signal of the correlation signal are respectively output by the first electro-optical conversion unit and the second electro-optical conversion unit.

[0184] Remark 5. The method according to Remark 4, wherein the first electro-optical conversion unit and the second electro-optical conversion unit are modulation units of different modulators; or

[0185] The first electro-optical conversion unit and the second electro-optical conversion unit are different modulation units of the same modulator.

[0186] Remark 6. The method according to Remark 1, wherein determining the first product signal of the signal to be measured and the correlation signal by an optical method includes:

[0187] Perform optoelectronic conversion on the product of the optical signal of the signal to be measured and the optical signal of the correlation signal to obtain the first product signal;

[0188] Wherein, the first electro-optical conversion unit and the second electro-optical conversion unit are connected in series, and the product of the optical signal of the signal to be measured and the optical signal of the correlation signal is output after the first electro-optical conversion unit and the second electro-optical conversion unit are connected in series.

[0189] Remark 7. The method according to Remark 6, wherein the first electro-optical conversion unit and the second electro-optical conversion unit are modulation units of different modulators.

[0190] Remark 8. The method according to any one of Remarks 1 to 7, wherein before the second signal is input into the second electro-optical conversion unit, the method further comprises:

[0191] Multiplying the second signal by a low-frequency square wave to obtain a second product signal;

[0192] And, the inputting the second signal into the second electro-optical conversion unit to modulate the optical signal to be modulated to obtain a correlation signal, comprising:

[0193] Inputting the product of the second product signal and the low-frequency square wave into the second electro-optical conversion unit to modulate the direct-current optical signal to obtain the correlation signal.

[0194] Remark 9. The method according to Remark 8, wherein before the electrical averaging operation is performed on the first product signal, the method further comprises:

[0195] Multiplying the first product signal by the low-frequency square wave to obtain a third product signal;

[0196] And the performing the electrical averaging operation on the first product signal to determine the correlation quantity between the signal to be measured and the correlation signal, comprising:

[0197] Performing an electrical averaging operation on the product of the first product signal and the low-frequency square wave to determine the correlation quantity between the signal to be measured and the correlation signal.

[0198] Remark 10. An electronic device, comprising a memory and a processor, wherein the memory stores a computer program, and the processor is configured to execute the computer program to implement the method for determining the correlation quantity of the signal according to any one of Remarks 1 to 9.

[0199] Remark 11. A storage medium storing a computer-readable program, wherein the computer-readable program causes a computer to execute the method for determining the correlation quantity of the signal according to any one of Remarks 1 to 9 in an electronic device.

Claims

1. A device for determining a signal-related quantity, characterized in that, The device includes: A first signal input unit, which is used to input a first signal into a first electro-optical conversion unit, so that the first electro-optical conversion unit modulates the light to be modulated according to the input first signal to obtain a signal to be measured; A second signal input unit, which is used to input a second signal into a second electro-optical conversion unit, so that the second electro-optical conversion unit modulates the light to be modulated according to the input second signal to obtain a correlation signal; A first signal processing unit, which is used to determine a first product signal of the signal to be measured and the correlation signal by an optoelectronic method or an optical method; A second signal processing unit, which is used to perform an electrical averaging operation on the first product signal to determine the correlation quantity between the signal to be measured and the correlation signal.

2. The device according to claim 1, wherein, The first electro-optical conversion unit is a transmitter or a partial modulation unit of a transmitter.

3. The apparatus according to claim 1, wherein The second electro-optical conversion unit outputs a finite number of states.

4. The device according to claim 1, wherein The first electro-optical conversion unit and the second electro-optical conversion unit are connected in parallel; And the first electro-optical conversion unit and the second electro-optical conversion unit respectively output the optical signal of the signal to be measured and the optical signal of the correlation signal; The first signal processing unit includes an optoelectronic multiplier, and the optoelectronic multiplier is used for: Performing optoelectronic conversion and multiplication operations on the sum of the optical signal of the signal to be measured and the optical signal of the correlation signal to obtain the first product signal.

5. The device according to claim 4, wherein, The first electro-optical conversion unit and the second electro-optical conversion unit are modulation units of different modulators; or The first electro-optical conversion unit and the second electro-optical conversion unit are different modulation units of the same modulator.

6. The device according to claim 1, wherein The first electro-optical conversion unit and the second electro-optical conversion unit are connected in series; And after the first electro-optical conversion unit and the second electro-optical conversion unit are connected in series, they output the product of the optical signal of the signal to be measured and the optical signal of the correlation signal; The first signal processing unit includes an optoelectronic conversion unit, and the optoelectronic conversion unit is used for: Performing optoelectronic conversion on the product of the optical signal of the signal to be measured and the optical signal of the correlation signal to obtain the first product signal.

7. The device according to claim 6, wherein, The first electro-optical conversion unit and the second electro-optical conversion unit are modulation units of different modulators.

8. The device according to claim 1, wherein The device further includes: A first multiplication unit, which is used to multiply the second signal by a low-frequency square wave to obtain a second product signal before inputting the second signal into the second electro-optical conversion unit; And the second signal input unit is specifically used for: Inputting the second product signal into the second electro-optical conversion unit, so that the second electro-optical conversion unit modulates the light to be modulated according to the second product signal to obtain the correlation signal.

9. The device according to claim 8, wherein, The device further includes: A second multiplication unit, which is used to multiply the first product signal by the low-frequency square wave to obtain a third product signal before performing an electrical averaging operation on the first product signal; And the second signal processing unit is specifically used for: Performing an electrical averaging operation on the third product signal after multiplying the first product signal by the low-frequency square wave to determine the correlation quantity between the signal to be measured and the correlation signal.

10. A method for determining a signal-related quantity, characterized in that The method includes: Input the first signal into the first electro-optical conversion unit, so that the first electro-optical conversion unit modulates the light to be modulated according to the input first signal to obtain a signal to be measured; Input the second signal into the second electro-optical conversion unit, so that the second electro-optical conversion unit modulates the light to be modulated according to the input second signal to obtain a correlation signal; Determine the first product signal of the signal to be measured and the correlation signal by an optoelectronic method or an optical method; Perform an electrical averaging operation on the first product signal to determine the correlation quantity between the signal to be measured and the correlation signal.

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