CN111130649B - Pilot signal generation method and device and optical module - Google Patents
Pilot signal generation method and device and optical module Download PDFInfo
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- CN111130649B CN111130649B CN201911333505.9A CN201911333505A CN111130649B CN 111130649 B CN111130649 B CN 111130649B CN 201911333505 A CN201911333505 A CN 201911333505A CN 111130649 B CN111130649 B CN 111130649B
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/60—Receivers
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- H04B14/02—Transmission systems not characterised by the medium used for transmission characterised by the use of pulse modulation
- H04B14/04—Transmission systems not characterised by the medium used for transmission characterised by the use of pulse modulation using pulse code modulation
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Abstract
The embodiment of the application provides a pilot signal generation method, a pilot signal generation device and an optical module, wherein the method comprises the following steps: generating a first square wave signal; adjusting the duty ratio of the first square wave signal to obtain a second square wave signal; obtaining a pilot signal with preset amplitude according to the second square wave signal; wherein one of the first square wave signal or the second square wave signal is a modulation signal carrying a management maintenance signal. An object of the embodiments of the present application is to provide a pilot signal generating method and an optical module, which can load a disturbing signal with a predetermined amplitude on a traffic signal for optical signal transmission.
Description
Technical Field
The present application relates to the field of optical modules, and in particular, to a pilot signal generation method and apparatus, and an optical module.
Background
In order to increase an Operation, Administration, and Maintenance (OAM) function of the optical modules, the optical modules additionally add secondary pilot modulation on the basis of normally transmitting optical service signals, that is, modulate an amplitude modulation ASK signal with relatively low amplitude or a frequency modulation FSK signal or a continuous periodic wave signal on the normal optical service signals, where the relatively low amplitude modulation signal is used to transmit the OAM signals between the optical modules, as shown in fig. 1. At present, most of pilot frequency generation modules are DDS (digital frequency synthesizer) devices actually, and the devices not only increase the complexity of an optical module, but also increase the cost of the optical module.
Disclosure of Invention
An object of the embodiments of the present application is to provide a pilot signal generating method and an optical module, which can load a disturbing signal with a predetermined amplitude on a traffic signal for optical signal transmission.
In a first aspect, an embodiment of the present application provides a method for generating a pilot signal, where the method includes: generating a first square wave signal; adjusting the duty ratio of the first square wave signal to obtain a second square wave signal; and obtaining a pilot signal with preset amplitude according to the second square wave signal.
According to the embodiment of the application, the amplitude of the generated pilot signal (namely the disturbing signal) is controlled by controlling the duty ratio of the square wave signal, so that the disturbing signal and the service signal can be transmitted in the optical fiber.
In some embodiments, the adjusting the duty cycle of the first square wave signal comprises: acquiring the relation between the amplitude of the periodic signal corresponding to the first square wave signal and the preset amplitude; determining a duty ratio adjustment direction according to the relationship; and adjusting the duty ratio of the first square wave signal according to the adjusting direction.
According to the method and the device, the relation between the amplitude of the target disturbance signal and the amplitude of the generated first square wave signal is compared to determine how to adjust the duty ratio of the first square wave signal, and finally the disturbance signal meeting the amplitude requirement is output.
In some embodiments, said determining a duty cycle adjustment direction from said relationship comprises: when the relation represents that the amplitude of the periodic signal corresponding to the first square wave signal is larger than the preset amplitude, determining to adjust the duty ratio of the first square wave signal in a direction away from fifty percent; when the relation represents that the amplitude of the periodic signal corresponding to the first square wave signal is smaller than the preset amplitude, determining to adjust the duty ratio of the first square wave signal to a direction close to fifty percent.
According to the embodiment of the application, the adjustment direction of the first square wave signal is determined through the magnitude relation between the duty ratio and the amplitude of the output periodic signal.
In some embodiments, the generating a first square wave signal comprises: acquiring a modulated signal; generating an initial square wave signal; and modulating the initial square wave signal according to the modulated signal to obtain the first square wave signal.
According to the embodiment of the application, the first square wave signal is used for carrying the modulated signal, and then the duty ratio of the first square wave signal is adjusted to control the amplitude of the disturbance signal carrying the management and maintenance signal.
In some embodiments, said modulating said initial square wave signal according to said modulated signal to obtain said first square wave signal comprises: modulating the amplitude of the initial square wave signal according to the modulated signal to obtain a first square wave signal; or modulating the frequency of the initial square wave signal according to the modulated signal to obtain the first square wave signal. According to the embodiment of the application, the frequency and the amplitude of the square wave signal are modulated by the management maintenance signal, and a frequency modulation signal or an amplitude modulation signal is obtained.
In some embodiments, the pilot signal generation method comprises: acquiring a modulated signal; wherein the obtaining a pilot signal according to the second square wave signal includes: and modulating the second square wave signal according to the modulated signal to obtain the pilot signal.
According to the embodiment of the application, the second square wave signal after amplitude limiting is used for carrying the management maintenance signal, and the pilot signal with the preset amplitude is obtained.
In some embodiments, said modulating said second square wave signal according to said modulated signal comprises: modulating the amplitude of the second square wave signal according to the modulated signal; or modulating the second square wave signal frequency according to the modulated signal.
According to the embodiment of the application, the amplitude or the frequency of the second square wave signal after the amplitude is modulated and controlled by the management maintenance signal is used for obtaining the frequency modulation signal or the amplitude modulation signal.
In some embodiments, said modulating the amplitude of the initial square wave signal according to the modulated signal or modulating the amplitude of the second square wave signal according to the modulated signal comprises: determining the length of an adjusting time window according to the transmission duration of unit bit data of the modulated signal; and switching the initial square wave signal or the second square wave signal by taking the length of the adjusting time window as a unit to obtain an amplitude modulation signal, wherein the amplitude modulation signal is the pilot signal.
The embodiment of the application modulates the management maintenance signal to the square wave signal by controlling the switch of the square wave signal within the unit bit transmission time of the management maintenance signal.
In some embodiments, said modulating said initial square wave signal frequency according to said modulated signal or said second square wave signal frequency according to said modulated signal comprises: determining the length of an adjusting time window according to the transmission duration of unit bit data of the modulated signal; and adjusting the frequency of the initial square wave signal or the second square wave signal by taking the length of the adjusting time window as a unit.
The embodiment of the application controls the frequency of the square wave signal in the unit bit transmission time of the management maintenance signal to modulate the management maintenance signal to the square wave signal.
In a second aspect, an embodiment of the present application further provides a pilot signal generating apparatus, including: a first square wave signal generation unit configured to generate a first square wave signal; a duty ratio adjusting unit configured to adjust a duty ratio of the first square wave signal to obtain a second square wave signal; a pilot signal generating unit configured to generate a pilot signal of a predetermined amplitude based on the second square wave signal.
In a third aspect, an embodiment of the present application further provides an optical module, where the optical module includes: the signal processing module is configured to produce a first square wave signal, and adjust the duty ratio of the first square wave signal to generate a second square wave signal; and the filter is configured to filter the second square wave signal to obtain a pilot signal.
In some embodiments, the signal processing module is a DSP device, an MCU device, or an FPGA device.
In some embodiments, the light module further comprises: a pilot loading module configured to couple the pilot signal to a traffic electrical signal, generating a traffic electrical signal with pilot modulation; and a laser: and converting the service electric signal into an optical signal.
In a fourth aspect, an embodiment of the present application further provides an information processing apparatus, including a memory, a processor, and a computer program stored on the memory and executable on the processor, where the program, when executed by the processor, may implement one or more of the methods in the corresponding aspects described in the first aspect.
In a fifth aspect, the present application further provides a computer-readable storage medium, on which a computer program is stored, where the program can implement one or more methods in the corresponding schemes described in the first aspect when executed by a processor.
In a sixth aspect, the present application provides a computer program product which, when run on a computer, causes the computer to perform the method of any possible implementation of the first aspect.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments of the present application will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and that those skilled in the art can also obtain other related drawings based on the drawings without inventive efforts.
Fig. 1 is a schematic diagram of optical signal transmission provided in an embodiment of the present application;
fig. 2 is a flowchart of a method for generating a pilot signal according to an embodiment of the present application;
fig. 3 is a graph illustrating a relationship between a duty ratio of a square wave signal and an amplitude of an output periodic signal according to an embodiment of the present disclosure;
FIG. 4 is a graph illustrating the relationship between the duty ratio of another square wave signal and the amplitude of the output periodic signal provided by the embodiment of the present application;
fig. 5 is a schematic diagram of obtaining a pilot signal by using an amplitude modulation signal of a first square wave signal carrying a management maintenance signal according to an embodiment of the present application;
fig. 6 is a schematic diagram of obtaining a pilot signal by using a frequency modulation signal of a first square wave signal carrying a management maintenance signal according to an embodiment of the present application;
fig. 7 is a schematic diagram of obtaining a pilot signal by using an amplitude modulation signal of a third party wave signal carrying a management maintenance signal according to an embodiment of the present application;
fig. 8 is a schematic diagram of obtaining a pilot signal by using a frequency modulation signal of a fourth wave signal carrying a management maintenance signal according to an embodiment of the present application;
fig. 9 is a block diagram of a pilot signal generating apparatus according to an embodiment of the present disclosure;
fig. 10 is a block diagram of an optical module provided in an embodiment of the present application;
fig. 11 is a further block diagram of an optical module provided in the embodiment of the present application;
fig. 12 is a block diagram of an electronic device according to an embodiment of the present disclosure.
Detailed Description
The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures. Meanwhile, in the description of the present application, the terms "first", "second", and the like are used only for distinguishing the description, and are not to be construed as indicating or implying relative importance.
In order to increase an Operation, Administration, and Maintenance (OAM) function of the optical modules, the optical modules additionally add secondary pilot modulation on the basis of normally transmitting optical service signals, that is, modulate an amplitude modulation ASK signal with relatively low amplitude or a frequency modulation FSK signal or a continuous periodic wave signal on the normal optical service signals, where the relatively low amplitude modulation signal is used to transmit the OAM signals between the optical modules, as shown in fig. 1. At present, most of pilot frequency generation modules are DDS (digital frequency synthesizer) devices actually, and the devices not only increase the complexity of an optical module, but also increase the cost of the optical module.
As an example, fig. 1 shows an optical module 1 and an optical module 2 that communicate with each other, where the optical module 1 includes a transmitting end and a receiving end, and the optical module 2 includes a receiving end and a transmitting end. The transmission end of the optical module 1 in fig. 1 generates a management maintenance signal to the optical module 2, and the binary signal corresponding to the management maintenance signal is "0110011010". The OAM modulation signal shown in fig. 1 is a modulation signal obtained by modulating the amplitude of the management maintenance signal, and the service modulation signal is a modulation signal obtained by modulating the service signal. The traffic modulation signal (i.e., the signal obtained by modulating the traffic signal) and the management and maintenance modulation signal (i.e., the signal obtained by modulating the OAM) in fig. 1 are transmitted to the receiving end of the optical module 2 through an optical fiber. According to the embodiment of the application, the amplitude of the OAM modulation signal can be controlled at least by controlling the duty ratio of the square wave, and the amplitude of the disturbance signal is controlled.
An object of the embodiments of the present application is to provide a pilot signal generating method and an optical module, which can load a disturbing signal with a predetermined amplitude on a traffic signal for optical signal transmission.
As shown in fig. 2, an embodiment of the present application provides a pilot signal generating method 100, where the pilot signal generating method 100 includes: s101, generating a first square wave signal; s102, adjusting the duty ratio of the first square wave signal to obtain a second square wave signal; and S103, obtaining a pilot signal with a preset amplitude according to the second square wave signal.
It should be noted that, in some examples, the first square wave signal is a modulated signal carrying a management maintenance signal. In some examples, the first square wave signal is a frequency modulation signal or an amplitude modulation signal obtained based on a management maintenance signal (e.g., a management maintenance signal between optical modules), and then the second square wave signal controls or adjusts the amplitude of the frequency modulation signal or the amplitude modulation signal to obtain a pilot signal with a predetermined amplitude. For example, the pilot signal is the OAM modulated signal shown in fig. 1.
In other examples, the first square wave signal is a square wave signal that does not carry the management maintenance signal, and at this time, the second square wave signal may be modulated by the management maintenance signal to obtain a modulation type that carries the management maintenance signal.
The inventor of the application creatively discovers the relationship between the duty ratio of the square wave signal and the amplitude of the periodic signal output after filtering in the research and development process.
The difference between the amplitudes of the output periodic signals caused by the difference in the duty ratios of the square wave signals is briefly shown below by means of fig. 3 and 4.
Fig. 3 shows that the square wave signal has an amplitude of K, a frequency of F and a duty ratio of 50%, and is filtered by the analog filter to obtain a first periodic signal, which may be a sine wave signal, a similar sine wave signal or a triangular wave signal having an amplitude of a and a frequency of F; fig. 4 is a diagram illustrating the duty ratio of the square wave signal of fig. 3 adjusted to twenty-five percent (i.e., the square wave signal of fig. 4 has an amplitude of K, a frequency of F, and a duty ratio of 25%), and the square wave signal of fig. 4 is analog-filtered to obtain a second periodic signal, which is a similar sine wave signal or triangle wave signal having an amplitude of a/2 and a frequency of F.
The inventors of the present application found that: when the duty ratio of the square wave signal is 50%, the amplitude value of the output periodic signal is maximum; when the duty ratio of the adjusted square wave signal is more than 50%, the amplitude value of the output periodic signal is reduced in proportion with the increase of the duty ratio; when the duty ratio of the adjusted square wave signal is less than 50%, the amplitude value of the output periodic signal is reduced in proportion to the reduction of the duty ratio. In addition, the frequency of the output periodic signal is consistent with the frequency of the input square wave signal, so that the frequency of the output periodic signal can be adjusted by adjusting the frequency of the square wave signal.
The above and following embodiments of the present application utilize the control relationship between the duty ratio of the square wave signal and the amplitude of the output periodic signal shown in fig. 3 and fig. 4, and control the amplitude of the generated pilot signal (i.e., the disturbing signal) by controlling the duty ratio of the square wave signal, so that the pilot signal (or, referred to as the disturbing signal) and the traffic signal can be simultaneously transmitted in the optical fiber.
In some embodiments, S102 adjusts a duty cycle of the first square wave signal, including: 102-1, acquiring the relation between the amplitude of the periodic signal corresponding to the first square wave signal and the preset amplitude; 102-2, determining the duty ratio adjusting direction according to the relation; and 102-3, adjusting the duty ratio of the first square wave signal according to the adjusting direction.
In some embodiments, the determining the duty cycle adjustment direction according to the relationship of step 102-2 includes: when the relationship indicates that the amplitude of the first square wave signal is greater than the predetermined amplitude, determining to adjust the duty cycle of the first square wave signal in a direction away from fifty percent; determining to adjust the duty cycle of the first square wave signal toward a direction approaching fifty percent when the relationship characterizes that the first square wave signal amplitude is less than the predetermined amplitude.
The above-described steps 102-1, 102-2, and 102-3 are exemplarily described below with reference to fig. 3 and 4.
Assuming that the square wave signal of fig. 3 is the first square wave signal, the system requires that the predetermined amplitude of the finally produced pilot signal be a/2. Therefore, the adjusting the duty ratio of the first square wave signal in step S102 may include: obtaining an amplitude a of the periodic signal corresponding to the first square wave signal in fig. 3 (for example, obtaining the amplitude of the periodic signal by filtering the first square wave signal through a filter, that is, obtaining the periodic signal by filtering the first square wave signal through an analog filter, where the amplitude of the periodic signal is the amplitude of the first square wave signal), and reading the predetermined amplitude of the pilot signal from the system to be a/2 (that is, the amplitude of the periodic signal shown in fig. 4); comparing the two amplitude values to obtain the relationship between the two amplitude values, namely 1/2 that the predetermined amplitude value A/2 is the amplitude value A of the periodic signal corresponding to the first square wave signal; then, according to a rule (for example, the rule shown in fig. 3 and 4) between the duty ratio change and the amplitude change of the corresponding periodic signal, it is determined that the duty ratio of the first square wave signal should be adjusted to be smaller, that is, the duty ratio of the first square wave signal should be adjusted in a direction away from fifty percent; and adjusting the duty ratio of the first square wave signal according to the determined adjustment direction, namely adjusting the duty ratio to be twenty-five percent.
According to the embodiment of the application, the relation between the amplitude of the pilot signal and the amplitude of the periodic signal corresponding to the first square wave signal is compared to determine how to adjust the duty ratio of the first square wave signal, and finally the disturbing signal meeting the amplitude requirement is output, so that the amplitude of the disturbing signal is effectively controlled. For example, the embodiment of the application determines the adjustment direction of the first square wave signal through the magnitude relation between the duty ratio and the amplitude of the output periodic signal.
An example 1 corresponding to the first square wave signal being a modulated signal carrying a management maintenance signal will be described.
The first square wave signal of step S101 may be a modulated signal obtained by modulating a management maintenance signal between optical modules, and the process of S101 generating the first square wave signal may include: s101-1, acquiring modulated signals (for example, acquiring management and maintenance signals between optical modules); s101-2, generating an initial square wave signal (for example, the amplitude of the initial square wave signal is M, the frequency is L, and the duty ratio is x%); s101-3, modulating the initial square wave signal according to the modulated signal to obtain the first square wave signal. Correspondingly, S102 adjusts the duty ratio of the first square wave signal to obtain a second square wave signal, that is, adjusts the duty ratio of the square wave signal carrying the management and maintenance signal to obtain the second square wave signal.
According to the embodiment of the application, the first square wave signal is used for carrying the modulated signal, and then the duty ratio of the first square wave signal is adjusted to control the amplitude of the disturbance signal carrying the management and maintenance signal.
S101-3, modulating the initial square wave signal according to the modulated signal to obtain the first square wave signal, may include: modulating the amplitude of the initial square wave signal according to the modulated signal to obtain a first square wave signal; or modulating the frequency of the initial square wave signal according to the modulated signal to obtain the first square wave signal. According to the embodiment of the application, the frequency and the amplitude of the square wave signal are modulated by the management maintenance signal, and a frequency modulation signal or an amplitude modulation signal is obtained. Correspondingly, S102 adjusts the duty ratio of the first square wave signal to obtain a second square wave signal, that is, adjusts the duty ratio of the square wave signal carrying the management and maintenance signal in an amplitude modulation or frequency modulation manner to obtain the second square wave signal.
Two forms of the first square wave signal carrying the management maintenance signal, i.e., an amplitude modulation signal (e.g., the first square wave signal of fig. 5) and a frequency modulation signal (e.g., the first square wave signal of fig. 6), are described below with reference to fig. 5 and 6.
The first square wave signal shown in fig. 5 is an amplitude modulation signal carrying a management maintenance signal, and then the amplitude modulation signal needs to be duty-adjusted to generate a second square wave signal (not shown in the figure), and then the second square wave signal is filtered by the analog filter shown in fig. 5 to obtain a pilot signal, where the pilot signal is a sine-form amplitude modulation signal.
The first square wave signal shown in fig. 6 is a frequency modulation signal carrying a management maintenance signal, and the subsequent frequency modulation signal needs to be duty-adjusted to generate a second square wave signal (not shown in the figure), and then the second square wave signal is filtered by the analog filter shown in fig. 6 to obtain a pilot signal, which is a frequency modulation signal in a sinusoidal form.
An example 2 of modulating the second square wave signal with the management maintenance signal to obtain the pilot signal is described below.
In some embodiments, the pilot signal generation method 100 may further include: acquiring a modulated signal; at this time, S103 obtains a pilot signal with a predetermined amplitude according to the second square wave signal, including: and modulating the second square wave signal according to the modulated signal to obtain the pilot signal. For example, the modulating the second square wave signal according to the modulated signal may include: modulating the amplitude of the second square wave signal according to the modulated signal; or modulating the second square wave signal frequency according to the modulated signal. According to the embodiment of the application, the amplitude or the frequency of the second square wave signal is modulated through the management maintenance signal, so that a frequency modulation signal or an amplitude modulation signal is obtained.
The types of the third square wave signal obtained after modulating the second square wave signal according to the management maintenance signal, that is, the amplitude modulation signal (e.g., the third square wave signal of fig. 7) and the frequency modulation signal (e.g., the fourth square wave signal of fig. 8) will be described below with reference to fig. 7 and 8.
The third square wave signal shown in fig. 7 is a square wave signal obtained by modulating the amplitude of the second square wave signal according to the management maintenance signal, where the third square wave signal is an amplitude modulation signal carrying the management maintenance signal (for example, the third square wave signal may be obtained by using an amplitude modulation method shown below), and then the third square wave signal is filtered by the analog filter shown in fig. 5 to obtain a pilot signal, where the pilot signal is an amplitude modulation signal in a sinusoidal form.
The fourth wave signal illustrated in fig. 8 is a square wave signal obtained by modulating the frequency of the second square wave signal according to the management maintenance signal, the fourth wave signal (for example, the fourth wave signal may be obtained by using a frequency modulation method shown below) is a frequency modulation signal carrying the management maintenance signal, and then the fourth wave signal is filtered by the analog filter shown in fig. 6 to obtain a pilot signal, which is a frequency modulation signal in a sinusoidal form.
The detailed generation process of the amplitude modulation signal in fig. 5 or fig. 7 is exemplarily described below.
The process of modulating the amplitude of the initial square wave signal according to the modulated signal (i.e., the management maintenance signal between optical modules) to obtain the first square wave signal of fig. 5, or modulating the amplitude of the second square wave signal according to the modulated signal to obtain the third square wave signal of fig. 7 may include: determining an adjustment time window length according to a transmission duration of unit bit data of the modulated signal (for example, a management maintenance signal between optical modules); and performing switching processing on the initial square wave signal (not shown in the figure) or the second square wave signal (not shown in the figure) by taking the length of the adjustment time window as a unit to obtain an amplitude modulation signal (i.e. obtaining the first square wave signal shown in fig. 5 or obtaining the third square wave signal shown in fig. 7).
The embodiment of the application modulates the management maintenance signal to the square wave signal by controlling the switch of the square wave signal within the unit bit transmission time of the management maintenance signal.
The detailed generation process of the frequency modulation signal in fig. 6 or fig. 8 is exemplarily described below.
The aforementioned modulating the frequency of the initial square wave signal according to the modulated signal to obtain the first square wave signal of fig. 6, or modulating the frequency of the second square wave signal according to the modulated signal to obtain the fourth square wave signal of fig. 8 includes: determining the length of an adjusting time window according to the transmission duration of unit bit data of the modulated signal (namely, a management and maintenance signal between optical modules); and adjusting the frequency of the initial square wave signal or the second square wave signal by taking the length of the adjusting time window as a unit. For example, the first square wave signal shown in fig. 6 and the third square wave signal shown in fig. 8 are frequency modulated signals.
The embodiment of the application controls the frequency of the square wave signal in the unit bit transmission time of the management maintenance signal to modulate the management maintenance signal to the square wave signal.
The pilot signal generating apparatus 900 is described below with reference to fig. 9.
Fig. 9 shows a pilot signal generating apparatus 900 according to an embodiment of the present application, and it should be understood that the apparatus 900 corresponds to the embodiment of the pilot signal generating method 100 in fig. 2, and can perform various steps related to the embodiment of the method 100, and specific functions of the apparatus 900 may be referred to the description above, and detailed descriptions are appropriately omitted herein to avoid repetition. The apparatus 900 includes at least one software functional module that can be stored in a memory in the form of software or firmware or be solidified in an operating system of the apparatus 900, and the pilot signal generating apparatus 900 may include: a first square wave signal generating unit 910 configured to generate a first square wave signal; a duty ratio adjusting unit 920 configured to adjust a duty ratio of the first square wave signal to obtain a second square wave signal; a pilot signal generating unit 930 configured to obtain a pilot signal of a predetermined amplitude from the second square wave signal.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working process of the apparatus 900 described above may refer to the corresponding process in the method 100, and will not be described in detail herein.
As shown in fig. 10, an embodiment of the present application further provides an optical module, where the optical module includes: a signal processing module 1001 configured to generate a first square wave signal, and adjust a duty ratio of the first square wave signal to obtain a second square wave signal; a filter 1002 configured to perform filtering processing on the second square wave signal to obtain a pilot signal.
In some embodiments, the signal processing module is a DSP device, an MCU device, or an FPGA device.
As shown in fig. 11, the optical module further includes: a pilot loading module configured to couple the pilot signal to a traffic electrical signal, generating a traffic electrical signal with pilot modulation; and a laser: and converting the service electric signal and the pilot signal into an optical signal. For example, the light module of fig. 11 also includes a driver module.
As shown in fig. 12, an information processing apparatus 1200 is further provided in an embodiment of the present application, and includes a memory 1210, a processor 1220, and a computer program stored on the memory 1210 and executable on the processor 1220, where the computer program can implement one or more methods in the corresponding schemes described in fig. 2 when executed by the processor 1220. For example, the processor 1220 reads a program from the memory 1210 through the bus 1230 to generate a first square wave signal, adjusts the duty ratio of the first square wave signal, and generates a pilot signal. Similar steps to the pilot signal generation method are not described in detail herein.
Embodiments of the present application further provide a computer-readable storage medium, on which a computer program is stored, where the computer program can implement one or more methods in the corresponding schemes described in fig. 2 above when being executed by a processor.
The present application provides a computer program product which, when run on a computer, causes the computer to perform the method of any of the possible implementations set forth in fig. 2.
In the embodiments provided in the present application, it should be understood that the disclosed apparatus and method can be implemented in other ways. The apparatus embodiments described above are merely illustrative, and for example, the flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of apparatus, methods and computer program products according to various embodiments of the present application. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
In addition, functional modules in the embodiments of the present application may be integrated together to form an independent part, or each module may exist separately, or two or more modules may be integrated to form an independent part.
The functions, if implemented in the form of software functional modules and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application or portions thereof that substantially contribute to the prior art may be embodied in the form of a software product stored in a storage medium and including instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
The above description is only an example of the present application and is not intended to limit the scope of the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
Claims (11)
1. A method for generating a pilot signal, the method comprising:
generating a first square wave signal;
adjusting the duty ratio of the first square wave signal to obtain a second square wave signal;
obtaining a pilot signal with preset amplitude according to the second square wave signal;
wherein the adjusting the duty cycle of the first square wave signal comprises:
acquiring the relation between the amplitude of the periodic signal corresponding to the first square wave signal and the preset amplitude;
determining a duty ratio adjustment direction according to the relationship;
adjusting the duty ratio of the first square wave signal according to the adjusting direction;
the determining the duty ratio adjustment direction according to the relationship includes:
when the relation represents that the amplitude of the periodic signal corresponding to the first square wave signal is larger than the preset amplitude, determining to adjust the duty ratio of the first square wave signal in a direction away from fifty percent;
when the relation represents that the amplitude of the periodic signal corresponding to the first square wave signal is smaller than the preset amplitude, determining to adjust the duty ratio of the first square wave signal to a direction close to fifty percent.
2. The pilot signal generation method of claim 1, wherein said generating the first square wave signal comprises:
acquiring a modulated signal;
generating an initial square wave signal;
and modulating the initial square wave signal according to the modulated signal to obtain the first square wave signal.
3. The pilot signal generating method according to claim 2, wherein said modulating the initial square wave signal according to the modulated signal to obtain the first square wave signal comprises:
modulating the amplitude of the initial square wave signal according to the modulated signal to obtain a first square wave signal; or
And modulating the frequency of the initial square wave signal according to the modulated signal to obtain the first square wave signal.
4. The pilot signal generation method of claim 1, wherein the pilot signal generation method comprises:
acquiring a modulated signal; wherein the content of the first and second substances,
the obtaining a pilot signal according to the second square wave signal includes: and modulating the second square wave signal according to the modulated signal to obtain the pilot signal.
5. The pilot signal generating method according to claim 4, wherein said modulating said second square wave signal according to said modulated signal comprises:
modulating the amplitude of the second square wave signal according to the modulated signal; or
Modulating the second square wave signal frequency according to the modulated signal.
6. The pilot signal generation method according to claim 3 or 5, wherein said modulating the amplitude of the initial square wave signal according to the modulated signal or modulating the amplitude of the second square wave signal according to the modulated signal comprises:
determining the length of an adjusting time window according to the transmission duration of unit bit data of the modulated signal;
and switching the initial square wave signal or the second square wave signal by taking the length of the adjusting time window as a unit to obtain an amplitude modulation signal, wherein the amplitude modulation signal is the pilot signal.
7. The pilot signal generation method of claim 3 or 5, wherein said modulating the initial square wave signal frequency according to the modulated signal or modulating the second square wave signal frequency according to the modulated signal comprises:
determining the length of an adjusting time window according to the transmission duration of unit bit data of the modulated signal;
and adjusting the frequency of the initial square wave signal or the second square wave signal by taking the length of the adjusting time window as a unit.
8. A pilot signal generating apparatus, characterized in that the pilot signal generating apparatus comprises:
a first square wave signal generation unit configured to generate a first square wave signal;
a duty ratio adjusting unit configured to adjust a duty ratio of the first square wave signal to obtain a second square wave signal;
a pilot signal generating unit configured to generate a pilot signal of a predetermined amplitude based on the second square wave signal;
wherein the content of the first and second substances,
the duty ratio adjustment unit is further configured to:
acquiring the relation between the amplitude of the periodic signal corresponding to the first square wave signal and the preset amplitude;
determining a duty ratio adjustment direction according to the relationship, wherein when the relationship represents that the amplitude of the periodic signal corresponding to the first square wave signal is larger than the preset amplitude, the duty ratio of the first square wave signal is determined to be adjusted in a direction away from fifty percent; when the relation represents that the amplitude of the periodic signal corresponding to the first square wave signal is smaller than the preset amplitude, determining to adjust the duty ratio of the first square wave signal to a direction close to fifty percent;
and adjusting the duty ratio of the first square wave signal according to the adjusting direction.
9. A light module, characterized in that the light module comprises:
a signal processing module configured to generate a first square wave signal and adjust a duty cycle of the first square wave signal to generate a second square wave signal, wherein the signal processing module is further configured to: acquiring the relation between the amplitude of the periodic signal corresponding to the first square wave signal and a preset amplitude; determining a duty ratio adjustment direction according to the relationship, wherein when the relationship represents that the amplitude of the periodic signal corresponding to the first square wave signal is larger than the preset amplitude, the duty ratio of the first square wave signal is determined to be adjusted in a direction away from fifty percent; when the relation represents that the amplitude of the periodic signal corresponding to the first square wave signal is smaller than the preset amplitude, determining to adjust the duty ratio of the first square wave signal to a direction close to fifty percent; adjusting the duty ratio of the first square wave signal according to the adjusting direction;
and the filter is configured to filter the second square wave signal to obtain a pilot signal.
10. The optical module of claim 9, wherein the signal processing module is a DSP device, an MCU device, or an FPGA device.
11. The light module of claim 9, further comprising:
a pilot loading module configured to couple the pilot signal to a traffic electrical signal, generating a traffic electrical signal with pilot modulation; and
a laser: and converting the service electric signal into an optical signal.
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