CN113438029A - OAM signal demodulation method, system and storage medium - Google Patents
OAM signal demodulation method, system and storage medium Download PDFInfo
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Abstract
The invention discloses an OAM signal demodulation method, a system and a storage medium, wherein the method comprises the following steps: the optical module receiving end converts the OAM optical signal into an OAM electric signal and sends the OAM electric signal to the optical module OAM electric signal acquisition extraction coupling part; the OAM electric signal acquisition, extraction and coupling part of the optical module updates the signal intensity of the OAM electric signal in real time, is isolated from a direct current signal received by the optical module and is sent to the OAM electric signal acquisition, extraction and coupling part of the optical module; an optical module OAM electrical signal hardware integrity processing part processes the OAM electrical signal by adopting a corresponding filtering frequency band and a corresponding amplification factor according to the power intensity of the OAM electrical signal and then sends the OAM electrical signal to an optical module OAM data demodulation processing part; and the OAM data demodulation processing part of the optical module converts the processed OAM electric signal into a digital signal and performs data extraction and storage processing according to a protocol. The invention can effectively improve the sensitivity of the OAM signal demodulation system.
Description
Technical Field
The invention relates to the technical field of OAM mechanism optical module demodulation, in particular to an OAM signal demodulation method, a system and a storage medium.
Background
The ordinary optical module only transmits one optical signal, but the OAM mechanism optical module transmits two optical signals, one is a high frequency signal used for transmitting normal service data, and the other is a low frequency signal loaded on the high frequency signal, that is, an OAM signal, which is used for conveniently managing the optical module and transmitting data of the conditions of DDM information, module state, etc. of the optical module itself. The OAM transmitting unit loads an OAM electric signal on a BIAS current driving circuit of the optical module, and then the optical module laser transmitting unit converts the OAM electric signal into an OAM optical signal which is transmitted along with a normal optical link; the receiving unit of the optical module can convert the OAM optical signal into an OAM electric signal, and the OAM electric signal is extracted and demodulated by an OAM electric signal demodulation circuit of the optical module and then is sent to the single chip microcomputer of the optical module for processing.
At present, the multi-stage demodulation circuit is mostly adopted, and a single FPGA or an additional MCU is used for understanding the modulation signal, so that the circuit layout space is increased, the cost is increased, and the following defects are also existed:
1. it is difficult to demodulate correct OAM data after RX LOS occurs on the optical module, because OAM signals are loaded on high frequency signals, if the modulation depth is too large, normal service transmission is affected, so the modulation depth of OAM signals needs to be controlled at 3% -5%, and such small modulation depth, in addition, the optical power intensity of RX LOS point of the optical module is generally very small, so it is difficult to demodulate complete OAM data after RX LOS occurs on the optical module;
2. the demodulation system is unstable, and other clutter and noise can be demodulated while the demodulation circuit at the receiving end of the optical module demodulates the OAM electric signal without filtering out high-frequency noise signals;
3. when clutter and noise are processed, the demodulation effect of the OAM electric signal is affected, and the OAM electric signal is distorted.
Disclosure of Invention
The invention mainly aims to provide an OAM signal demodulation method, an OAM signal demodulation system and a storage medium, and aims to improve the OAM data demodulation sensitivity.
In order to achieve the above object, the present invention provides an OAM signal demodulation method, which is applied to an OAM electrical signal data demodulation system, the system includes an optical module receiving end ROSA, an optical module OAM electrical signal acquisition, extraction, coupling, optical module OAM electrical signal hardware integrity processing and optical module OAM data demodulation processing, the method includes the following steps:
when the optical module receiving end ROSA receives an OAM optical signal, the OAM optical signal is converted into an OAM electrical signal, and the OAM electrical signal is sent to the optical module OAM electrical signal acquisition extraction coupling part;
the optical module OAM electric signal acquisition, extraction and coupling part updates the signal intensity of the OAM electric signal in real time, separates the OAM electric signal from a direct current signal received by an optical module, and sends the OAM electric signal to the optical module OAM electric signal acquisition, extraction and coupling part;
the optical module OAM electrical signal hardware integrity processing part processes the OAM electrical signal by adopting a corresponding filtering frequency band and a corresponding amplification factor according to the power intensity of the OAM electrical signal and then sends the OAM electrical signal to the optical module OAM data demodulation processing part;
and the OAM data demodulation processing part of the optical module converts the processed OAM electric signal into a digital signal and performs data extraction and storage processing according to a protocol.
The technical scheme of the invention is that the optical module OAM electric signal acquisition, extraction and coupling part comprises an RSSI sampling circuit and a coupling circuit, and the optical module OAM electric signal acquisition, extraction and coupling part updates the signal intensity of the OAM electric signal in real time and isolates the OAM electric signal from the optical module receiving optical direct current signal, and the method comprises the following steps:
the RSSI sampling circuit updates the signal intensity of the OAM electric signal in real time, and the coupling circuit isolates the OAM electric signal from a light receiving direct current signal of the optical module.
The optical module OAM electrical signal hardware integrity processing part adopts corresponding amplification times and filtering ranges to process the OAM electrical signal according to the power intensity of the OAM electrical signal, and comprises the following steps:
the filter circuit performs filtering processing on the OAM electric signal by adopting a corresponding filtering frequency band according to the power intensity of the OAM electric signal, the primary amplification circuit performs amplification processing on the OAM electric signal by adopting a corresponding amplification factor according to the power intensity of the OAM electric signal, and then the high and low levels which can be identified by the OAM data demodulation processing part of the optical module are obtained after the delay ratio is subjected to strong processing.
According to a further technical scheme, the main frequency of the OAM electric signal is 500Hz to 10kHz, and in the step of filtering the OAM electric signal by the filter circuit according to the power intensity of the OAM electric signal and by adopting a corresponding filter frequency band, the filter frequency band is set according to the main frequency of the OAM electric signal.
The invention further adopts the technical scheme that the optical module OAM data demodulation processing part comprises a single chip microcomputer, converts the processed OAM electric signal into a digital signal, and performs data extraction and storage processing according to a protocol, wherein the steps of:
the single chip microcomputer converts the processed OAM electric signal into a digital signal, and data extraction and storage processing are carried out according to a protocol.
In order to achieve the above object, the present invention further provides an OAM signal demodulation system, where the system includes an optical module receiving end ROSA, an optical module OAM electrical signal acquisition, extraction, coupling, optical module OAM electrical signal hardware integrity processing, an optical module OAM data demodulation processing, a memory and a processor, where the memory stores an OAM signal demodulation program, and the OAM signal demodulation program executes the following steps when called by the processor:
when the OAM optical signal is received by the optical module receiving end ROSA, the OAM optical signal is converted into an OAM electrical signal, and the OAM electrical signal is sent to the optical module OAM electrical signal acquisition extraction coupling part;
the optical module OAM electric signal acquisition, extraction and coupling part updates the signal intensity of the OAM electric signal in real time, isolates the OAM electric signal from an optical module receiving optical direct current signal and sends the OAM electric signal to the optical module OAM electric signal acquisition, extraction and coupling part;
the optical module OAM electrical signal hardware integrity processing part processes the OAM electrical signal by adopting a corresponding filtering frequency band and a corresponding amplification factor according to the power intensity of the OAM electrical signal and then sends the OAM electrical signal to the optical module OAM data demodulation processing part;
and the OAM data demodulation processing part of the optical module converts the processed OAM electric signal into a digital signal and performs data extraction and storage processing according to a protocol.
The technical scheme of the invention is that the optical module OAM electric signal acquisition, extraction and coupling part comprises an RSSI sampling circuit and a coupling circuit, and the optical module OAM electric signal acquisition, extraction and coupling part updates the signal intensity of the OAM electric signal in real time and isolates the OAM electric signal from the optical module receiving optical direct current signal, and the method comprises the following steps:
the RSSI sampling circuit updates the signal intensity of the OAM electric signal in real time, and the coupling circuit isolates the OAM electric signal from a light receiving direct current signal of the optical module.
The optical module OAM electrical signal hardware integrity processing part adopts corresponding amplification times and filtering ranges to process the OAM electrical signal according to the power intensity of the OAM electrical signal, and comprises the following steps:
the filter circuit performs filtering processing on the OAM electric signal by adopting a corresponding filtering frequency band according to the power intensity of the OAM electric signal, the primary amplification circuit performs amplification processing on the OAM electric signal by adopting a corresponding amplification factor according to the power intensity of the OAM electric signal, and then the high and low levels which can be identified by the OAM data demodulation processing part of the optical module are obtained after the delay ratio is subjected to strong processing.
According to a further technical scheme, the main frequency of the OAM electric signal is 500Hz to 10kHz, and in the step of filtering the OAM electric signal by the filter circuit according to the power intensity of the OAM electric signal and by adopting a corresponding filter frequency band, the filter frequency band is set according to the main frequency of the OAM electric signal.
To achieve the above object, the present invention also provides a computer readable storage medium storing an OAM signal demodulation program which, when called by a processor, performs the steps of the method as described above.
The OAM signal demodulation method, the system and the storage medium have the advantages that: the invention obtains the clean and complete OAM electric signal by peripheral hardware integrity processing and emphasizing on specific filtering, amplification and stability processing on the received OAM electric signal, and can effectively improve the sensitivity of an OAM signal demodulation system.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
Fig. 1 is a flow chart illustrating a preferred embodiment of an OAM signal demodulation method according to the present invention;
fig. 2 is a block diagram of a structure of an OAM electrical signal data demodulation system;
FIG. 3 is a schematic diagram showing simulation of amplitude-frequency characteristics of a circuit;
FIG. 4 is a diagram illustrating the demodulation result of an actual large optical signal;
fig. 5 is a diagram showing the demodulation result of an actual small optical signal.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1 to 5, the present invention provides an OAM signal demodulation method, which is mainly a method for demodulating and processing an OAM signal loaded on an optical signal, and can improve OAM data demodulation sensitivity.
The technical scheme adopted by the invention is mainly that when the receiving end of the optical module receives a carrier frequency optical signal, the optical signal is converted into an electric signal by the receiving end of the optical module. The optical module demodulation system collects and extracts the OAM signals, isolates the OAM signals from normal service data, performs hardware integrity processing on the OAM electrical signals, and finally performs demodulation processing on the OAM data through the single chip microcomputer.
Specifically, the OAM signal demodulation method of the present invention is applied to an OAM electrical signal data demodulation system, as shown in fig. 2, the OAM electrical signal data demodulation system includes an optical module receiving end ROSA, an optical module OAM electrical signal acquisition, extraction, coupling portion, an optical module OAM electrical signal hardware integrity processing portion, and an optical module OAM data demodulation processing portion, as shown in fig. 1, the preferred embodiment of the OAM signal demodulation method of the present invention includes the following steps:
step S10, when receiving the OAM optical signal, the optical module receiving end ROSA converts the OAM optical signal into an OAM electrical signal, and sends the OAM electrical signal to the optical module OAM electrical signal acquisition, extraction, and coupling part.
Step S20, the optical module OAM electrical signal acquisition, extraction, and coupling section updates the signal intensity of the OAM electrical signal in real time, separates the OAM electrical signal from the optical module received dc signal, and sends the separated OAM electrical signal to the optical module OAM electrical signal acquisition, extraction, and coupling section.
Specifically, the optical module OAM electrical signal acquisition, extraction and coupling part mainly comprises an RSSI sampling circuit and a coupling circuit.
The RSSI sampling circuit can update the OAM signal intensity in real time, the coupling circuit can isolate an OAM electric signal from a direct current signal received by the optical module, and the OAM electric signal at the moment is an alternating current small signal and is doped with various clutter and noise.
The optical module OAM electric signal acquisition, extraction and coupling part updates the signal intensity of the OAM electric signal in real time, and the steps of isolating the OAM electric signal from an optical module receiving optical direct current signal comprise:
the RSSI sampling circuit updates the signal intensity of the OAM electric signal in real time, and the coupling circuit isolates the OAM electric signal from a light receiving direct current signal of the optical module.
In step S30, the optical module OAM electrical signal hardware integrity processing part processes the OAM electrical signal by using the corresponding filtering frequency band and amplification factor according to the power intensity of the OAM electrical signal, and then sends the OAM electrical signal to the optical module OAM data demodulation processing part.
Specifically, the optical module OAM electrical signal hardware integrity processing part mainly includes a filter circuit, a first-stage amplifying circuit and a hysteresis comparator. The OAM electric signal extracted and isolated is filtered and amplified simultaneously, the OAM electric signal passes through a band-pass filter circuit firstly and then is amplified through a primary amplifying circuit, and meanwhile operational amplifier phase compensation and high-frequency filtering processing are needed to be carried out, so that the stability of the system is improved, and the inhibiting effect on high-frequency noise is further improved. The OAM electric signal after filtering and amplifying is processed by a hysteresis comparator to obtain high and low levels which can be identified by the single chip microcomputer.
As an embodiment, the optical module OAM electrical signal hardware integrity processing part processes the OAM electrical signal according to the power intensity of the OAM electrical signal by using the corresponding amplification factor and filtering range, including:
the filter circuit performs filtering processing on the OAM electric signal by adopting a corresponding filtering frequency band according to the power intensity of the OAM electric signal, the primary amplification circuit performs amplification processing on the OAM electric signal by adopting a corresponding amplification factor according to the power intensity of the OAM electric signal, and then the high and low levels which can be identified by the OAM data demodulation processing part of the optical module are obtained after the delay ratio is subjected to strong processing.
In this embodiment, the main frequency of the OAM electrical signal is between 500Hz and 10kHz, and in the step of performing filtering processing on the OAM electrical signal by the filter circuit according to the power intensity of the OAM electrical signal and using a corresponding filter frequency band, the filter frequency band is set according to the main frequency of the OAM electrical signal.
In this embodiment, under the condition that it is ensured that normal service transmission of the optical module is not affected by the OAM signal, in an actual OAM signal demodulation process, and under the condition that the optical module ROSA receives optical power signals of different intensities, a main problem is that it cannot be ensured that a clean and complete OAM electrical signal can be demodulated, and OAM sensitivity is low.
In case the optical module ROSA receives a small light, i.e. a small intensity optical power signal, e.g. an optical power as small as-28 dBm, a demodulation failure may result, mainly due to the fact that the OAM modulation depth cannot be too large and the amplification of the demodulation system is insufficient. And at this moment, the duty ratio of the high level and the low level output by the hysteresis comparator cannot be ensured to be 50:50, which affects the processing of the OAM data by the singlechip. Therefore, the demodulation of the OAM tiny electrical signal is ensured by increasing the amplification factor, but the blind increase of the amplification factor simultaneously amplifies the noise of the system, which affects the integrity of the OAM electrical signal.
When the optical module ROSA receives a large light, i.e. a high-intensity optical power signal, the large light, i.e. the high-intensity optical power signal, is amplified together with the optical noise and the electrical noise of the system, which results in a large amount of noise being demodulated. In order to ensure that a complete and clean OAM electric signal is demodulated, filtering processing needs to be performed on the OAM electric signal, but excessive filtering affects the amplification factor of the OAM electric signal, and even causes distortion of the OAM electric signal. The main frequency of the OAM electrical signal is generally between 500Hz and 10kHz, and in this embodiment, a filtering frequency band is designed according to the main frequency of the OAM electrical signal, as shown in the amplitude-frequency characteristic of fig. 3, the demodulation system can filter out the high-frequency signal noise above 30 kHz.
The reason why the hysteresis comparator is selected instead of the ordinary comparator in the embodiment is that a problem is encountered in an actual process, and when received optical power is weakly jumped due to peripheral optical fiber touch or optical module temperature change near a threshold point of the comparator, the voltage output high and low levels of the comparator are frequently changed, which may cause misjudgment of a normal OAM electrical signal by a single chip microcomputer, resulting in demodulation failure, so that the hysteresis comparator is improved.
In the optical module OAM electrical signal hardware integrity processing, if the amplification factor of a demodulation system is too large, the influence degree of extra noise is increased; if the amplification factor of the demodulation system is too small, the sensitivity of the OAM demodulation system is reduced; the filtering range of the demodulation system is too close to the frequency of the OAM electric signal, so that the distortion degree of the OAM electric signal can be increased; if the filtering range of the demodulation system is too wide, it is difficult to suppress the high-frequency noise of the system. Therefore, the present embodiment performs a trade-off between the amplification factor of the OAM signal and the filtering frequency, the amplification factor cannot be too large or too small, and the filtering range cannot be too wide or too narrow.
In order to improve the sensitivity of the OAM demodulation system, it is necessary to suppress the high-frequency noise of the system as much as possible while increasing the amplification factor of the system, and ensure the stability of the system and the distortion degree of the OAM electrical signal, according to the specific OAM sensitivity requirement, while ensuring the sensitivity of the OAM demodulation system, this embodiment selects to mainly filter the high-frequency signal noise above 30kHz, and the amplification factor is 68 times.
In this embodiment, a graph of an actual demodulation result of a large optical signal is shown in fig. 4, where an upper waveform in fig. 4 is an OAM electrical signal after filtering and amplifying processing, and a lower waveform is an OAM electrical signal recognized by the single chip microcomputer.
Fig. 5 shows a graph of an actual demodulation result of a small optical signal, where the upper waveform in fig. 5 is an OAM electrical signal after filtering and amplifying processing, and the lower waveform is an OAM electrical signal recognized by the single chip microcomputer.
In step S40, the optical module OAM data demodulation processing section converts the processed OAM electrical signal into a digital signal, and performs data extraction and storage processing according to a protocol.
Specifically, the optical module OAM data demodulation processing part mainly includes a single chip, and the single chip converts the acquired OAM electrical signal into a digital signal, and performs data extraction and storage processing according to a protocol.
The OAM signal demodulation method has the beneficial effects that: the invention obtains the clean and complete OAM electric signal by peripheral hardware integrity processing and emphasizing on specific filtering, amplification and stability processing on the received OAM electric signal, and can effectively improve the sensitivity of an OAM signal demodulation system.
In order to achieve the above object, the present invention further provides an OAM signal demodulation system, which is characterized in that the system includes an optical module receiving end ROSA, an optical module OAM electrical signal acquisition, extraction, coupling, optical module OAM electrical signal hardware integrity processing, an optical module OAM data demodulation processing, a memory and a processor, wherein an OAM signal demodulation program is stored in the memory, and when called by the processor, the OAM signal demodulation program executes the following steps:
step S10, when the optical module receiving end ROSA receives an OAM optical signal, converts the OAM optical signal into an OAM electrical signal, and sends the OAM electrical signal to the optical module OAM electrical signal acquisition extraction coupling part.
Step S20, the optical module OAM electrical signal acquisition, extraction, and coupling section updates the signal strength of the OAM electrical signal in real time, isolates the OAM electrical signal from the optical module received optical dc signal, and sends the OAM electrical signal to the optical module OAM electrical signal acquisition, extraction, and coupling section.
Specifically, the optical module OAM electrical signal acquisition, extraction and coupling part mainly comprises an RSSI sampling circuit and a coupling circuit.
The RSSI sampling circuit can update the OAM signal intensity in real time, the coupling circuit can isolate an OAM electric signal from a direct current signal received by the optical module, and the OAM electric signal at the moment is an alternating current small signal and is doped with various clutter and noise.
The optical module OAM electric signal acquisition, extraction and coupling part updates the signal intensity of the OAM electric signal in real time, and the steps of isolating the OAM electric signal from an optical module receiving optical direct current signal comprise:
the RSSI sampling circuit updates the signal intensity of the OAM electric signal in real time, and the coupling circuit isolates the OAM electric signal from a light receiving direct current signal of the optical module.
In step S30, the optical module OAM electrical signal hardware integrity processing part processes the OAM electrical signal by using the corresponding filtering frequency band and amplification factor according to the power intensity of the OAM electrical signal, and then sends the OAM electrical signal to the optical module OAM data demodulation processing part.
Specifically, the optical module OAM electrical signal hardware integrity processing part mainly includes a filter circuit, a first-stage amplifying circuit and a hysteresis comparator. The OAM electric signal extracted and isolated is filtered and amplified simultaneously, the OAM electric signal passes through a band-pass filter circuit firstly and then is amplified through a primary amplifying circuit, and meanwhile operational amplifier phase compensation and high-frequency filtering processing are needed to be carried out, so that the stability of the system is improved, and the inhibiting effect on high-frequency noise is further improved. The OAM electric signal after filtering and amplifying is processed by a hysteresis comparator to obtain high and low levels which can be identified by the single chip microcomputer.
As an embodiment, the optical module OAM electrical signal hardware integrity processing part processes the OAM electrical signal according to the power intensity of the OAM electrical signal by using the corresponding amplification factor and filtering range, including:
the filter circuit performs filtering processing on the OAM electric signal by adopting a corresponding filtering frequency band according to the power intensity of the OAM electric signal, the primary amplification circuit performs amplification processing on the OAM electric signal by adopting a corresponding amplification factor according to the power intensity of the OAM electric signal, and then the high and low levels which can be identified by the OAM data demodulation processing part of the optical module are obtained after the delay ratio is subjected to strong processing.
In this embodiment, the main frequency of the OAM electrical signal is between 500Hz and 10kHz, and in the step of performing filtering processing on the OAM electrical signal by the filter circuit according to the power intensity of the OAM electrical signal and using a corresponding filter frequency band, the filter frequency band is set according to the main frequency of the OAM electrical signal.
In this embodiment, under the condition that it is ensured that normal service transmission of the optical module is not affected by the OAM signal, in an actual OAM signal demodulation process, and under the condition that the optical module ROSA receives optical power signals of different intensities, a main problem is that it cannot be ensured that a clean and complete OAM electrical signal can be demodulated, and OAM sensitivity is low.
In case the optical module ROSA receives a small light, i.e. a small intensity optical power signal, e.g. an optical power as small as-28 dBm, a demodulation failure may result, mainly due to the fact that the OAM modulation depth cannot be too large and the amplification of the demodulation system is insufficient. And at this moment, the duty ratio of the high level and the low level output by the hysteresis comparator cannot be ensured to be 50:50, which affects the processing of the OAM data by the singlechip. Therefore, the demodulation of the OAM tiny electrical signal is ensured by increasing the amplification factor, but the blind increase of the amplification factor simultaneously amplifies the noise of the system, which affects the integrity of the OAM electrical signal.
When the optical module ROSA receives a large light, i.e. a high-intensity optical power signal, the large light, i.e. the high-intensity optical power signal, is amplified together with the optical noise and the electrical noise of the system, which results in a large amount of noise being demodulated. In order to ensure that a complete and clean OAM electric signal is demodulated, filtering processing needs to be performed on the OAM electric signal, but excessive filtering affects the amplification factor of the OAM electric signal, and even causes distortion of the OAM electric signal. The main frequency of the OAM electrical signal is generally between 500Hz and 10kHz, and in this embodiment, a filtering frequency band is designed according to the main frequency of the OAM electrical signal, as shown in the amplitude-frequency characteristic of fig. 3, the demodulation system can filter out the high-frequency signal noise above 30 kHz.
The reason why the hysteresis comparator is selected instead of the ordinary comparator in the embodiment is that a problem is encountered in an actual process, and when received optical power is weakly jumped due to peripheral optical fiber touch or optical module temperature change near a threshold point of the comparator, the voltage output high and low levels of the comparator are frequently changed, which may cause misjudgment of a normal OAM electrical signal by a single chip microcomputer, resulting in demodulation failure, so that the hysteresis comparator is improved.
In the optical module OAM electrical signal hardware integrity processing, if the amplification factor of a demodulation system is too large, the influence degree of extra noise is increased; if the amplification factor of the demodulation system is too small, the sensitivity of the OAM demodulation system is reduced; the filtering range of the demodulation system is too close to the frequency of the OAM electric signal, so that the distortion degree of the OAM electric signal can be increased; if the filtering range of the demodulation system is too wide, it is difficult to suppress the high-frequency noise of the system. Therefore, the present embodiment performs a trade-off between the amplification factor of the OAM signal and the filtering frequency, the amplification factor cannot be too large or too small, and the filtering range cannot be too wide or too narrow.
In order to improve the sensitivity of the OAM demodulation system, it is necessary to suppress the high-frequency noise of the system as much as possible while increasing the amplification factor of the system, and ensure the stability of the system and the distortion degree of the OAM electrical signal, according to the specific OAM sensitivity requirement, while ensuring the sensitivity of the OAM demodulation system, this embodiment selects to mainly filter the high-frequency signal noise above 30kHz, and the amplification factor is 68 times.
In this embodiment, a graph of an actual demodulation result of a large optical signal is shown in fig. 4, where an upper waveform in fig. 4 is an OAM electrical signal after filtering and amplifying processing, and a lower waveform is an OAM electrical signal recognized by the single chip microcomputer.
Fig. 5 shows a graph of an actual demodulation result of a small optical signal, where the upper waveform in fig. 5 is an OAM electrical signal after filtering and amplifying processing, and the lower waveform is an OAM electrical signal recognized by the single chip microcomputer.
In step S40, the optical module OAM data demodulation processing section converts the processed OAM electrical signal into a digital signal, and performs data extraction and storage processing according to a protocol.
The OAM signal demodulation system has the beneficial effects that: the invention obtains the clean and complete OAM electric signal by peripheral hardware integrity processing and emphasizing on specific filtering, amplification and stability processing on the received OAM electric signal, and can effectively improve the sensitivity of an OAM signal demodulation system.
In order to achieve the above object, the present invention further provides a computer-readable storage medium, wherein the computer-readable storage medium stores an OAM signal demodulation program, and when the OAM signal demodulation program is called by a processor, the steps of the method according to the above embodiment are executed, which is not described herein again.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. An OAM signal demodulation method is characterized in that the method is applied to an OAM electric signal data demodulation system, the system comprises an optical module receiving end ROSA, an optical module OAM electric signal acquisition, extraction and coupling part, an optical module OAM electric signal hardware integrity processing part and an optical module OAM data demodulation processing part, and the method comprises the following steps:
when the optical module receiving end ROSA receives an OAM optical signal, the OAM optical signal is converted into an OAM electrical signal, and the OAM electrical signal is sent to the optical module OAM electrical signal acquisition extraction coupling part;
the optical module OAM electric signal acquisition, extraction and coupling part updates the signal intensity of the OAM electric signal in real time, separates the OAM electric signal from a direct current signal received by an optical module, and sends the OAM electric signal to the optical module OAM electric signal acquisition, extraction and coupling part;
the optical module OAM electrical signal hardware integrity processing part processes the OAM electrical signal by adopting a corresponding filtering frequency band and a corresponding amplification factor according to the power intensity of the OAM electrical signal and then sends the OAM electrical signal to the optical module OAM data demodulation processing part;
and the OAM data demodulation processing part of the optical module converts the processed OAM electric signal into a digital signal and performs data extraction and storage processing according to a protocol.
2. The OAM signal demodulation method of claim 1, wherein the optical module OAM electrical signal acquisition, extraction, and coupling section includes an RSSI sampling circuit and a coupling circuit, and the step of the optical module OAM electrical signal acquisition, extraction, and coupling section updating the signal strength of the OAM electrical signal in real time and isolating the OAM electrical signal from the optical module received optical dc signal includes:
the RSSI sampling circuit updates the signal intensity of the OAM electric signal in real time, and the coupling circuit isolates the OAM electric signal from a light receiving direct current signal of the optical module.
3. The OAM signal demodulation method of claim 2, wherein the optical module OAM electrical signal hardware integrity processing section includes a filter circuit, a primary amplifier circuit, and a hysteresis comparator, and the step of processing the OAM electrical signal by the optical module OAM electrical signal hardware integrity processing section according to the power intensity of the OAM electrical signal with a corresponding amplification factor and a corresponding filtering range includes:
the filter circuit performs filtering processing on the OAM electric signal by adopting a corresponding filtering frequency band according to the power intensity of the OAM electric signal, the primary amplification circuit performs amplification processing on the OAM electric signal by adopting a corresponding amplification factor according to the power intensity of the OAM electric signal, and then the high and low levels which can be identified by the OAM data demodulation processing part of the optical module are obtained after the delay ratio is subjected to strong processing.
4. The OAM signal demodulation method according to claim 3, wherein a main frequency of the OAM electrical signal is between 500Hz and 10kHz, and in the step of performing, by the filter circuit, the filtering process on the OAM electrical signal by using a corresponding filter band according to the power intensity of the OAM electrical signal, the filter band is set according to the main frequency of the OAM electrical signal.
5. The OAM signal demodulation method of claim 3, wherein the optical module OAM data demodulation processing section includes a single chip microcomputer, the optical module OAM data demodulation processing section converts the processed OAM electrical signal into a digital signal, and the step of performing data extraction and storage processing according to a protocol includes:
the single chip microcomputer converts the processed OAM electric signal into a digital signal, and data extraction and storage processing are carried out according to a protocol.
6. An OAM signal demodulation system is characterized by comprising an optical module receiving end ROSA, an optical module OAM electric signal acquisition, extraction and coupling part, an optical module OAM electric signal hardware integrity processing part, an optical module OAM data demodulation processing part, a memory and a processor, wherein an OAM signal demodulation program is stored in the memory, and when the OAM signal demodulation program is called by the processor, the following steps are executed:
when the OAM optical signal is received by the optical module receiving end ROSA, the OAM optical signal is converted into an OAM electrical signal, and the OAM electrical signal is sent to the optical module OAM electrical signal acquisition extraction coupling part;
the optical module OAM electric signal acquisition, extraction and coupling part updates the signal intensity of the OAM electric signal in real time, isolates the OAM electric signal from an optical module receiving optical direct current signal and sends the OAM electric signal to the optical module OAM electric signal acquisition, extraction and coupling part;
the optical module OAM electrical signal hardware integrity processing part processes the OAM electrical signal by adopting a corresponding filtering frequency band and a corresponding amplification factor according to the power intensity of the OAM electrical signal and then sends the OAM electrical signal to the optical module OAM data demodulation processing part;
and the OAM data demodulation processing part of the optical module converts the processed OAM electric signal into a digital signal and performs data extraction and storage processing according to a protocol.
7. The OAM signal demodulation system of claim 6, wherein the optical module OAM electrical signal acquisition, extraction, and coupling section comprises an RSSI sampling circuit and a coupling circuit, and the step of the optical module OAM electrical signal acquisition, extraction, and coupling section updating the signal strength of the OAM electrical signal in real time and isolating the OAM electrical signal from the optical module received optical dc signal comprises:
the RSSI sampling circuit updates the signal intensity of the OAM electric signal in real time, and the coupling circuit isolates the OAM electric signal from a light receiving direct current signal of the optical module.
8. The OAM signal demodulation system of claim 7, wherein the optical module OAM electrical signal hardware integrity processing section includes a filter circuit, a primary amplification circuit, and a hysteresis comparator, and the step of the optical module OAM electrical signal hardware integrity processing section processing the OAM electrical signal according to the power strength of the OAM electrical signal with a corresponding amplification factor and filter range includes:
the filter circuit performs filtering processing on the OAM electric signal by adopting a corresponding filtering frequency band according to the power intensity of the OAM electric signal, the primary amplification circuit performs amplification processing on the OAM electric signal by adopting a corresponding amplification factor according to the power intensity of the OAM electric signal, and then the high and low levels which can be identified by the OAM data demodulation processing part of the optical module are obtained after the delay ratio is subjected to strong processing.
9. The OAM signal demodulation system of claim 8, wherein a main frequency of the OAM electrical signal is between 500Hz and 10kHz, and in the step of the filtering circuit filtering the OAM electrical signal by using a corresponding filtering band according to the power intensity of the OAM electrical signal, the filtering band is set according to the main frequency of the OAM electrical signal.
10. A computer-readable storage medium storing an OAM signal demodulation program that when invoked by a processor performs the steps of the method of any of claims 1 to 5.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106375058A (en) * | 2016-09-09 | 2017-02-01 | 青岛海信宽带多媒体技术有限公司 | Optical module |
| WO2020019845A1 (en) * | 2018-07-27 | 2020-01-30 | 中兴通讯股份有限公司 | Oam message transmission method, sending device, receiving device, and readable storage device |
| CN111371498A (en) * | 2020-03-11 | 2020-07-03 | 东莞铭普光磁股份有限公司 | Optical module signal processing method and device and optical module |
| CN111970053A (en) * | 2020-08-11 | 2020-11-20 | 瑞泰(威海)电子科技有限公司 | Demodulation device for top modulation signal and optical module |
-
2021
- 2021-05-31 CN CN202110601179.6A patent/CN113438029A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106375058A (en) * | 2016-09-09 | 2017-02-01 | 青岛海信宽带多媒体技术有限公司 | Optical module |
| WO2020019845A1 (en) * | 2018-07-27 | 2020-01-30 | 中兴通讯股份有限公司 | Oam message transmission method, sending device, receiving device, and readable storage device |
| CN111371498A (en) * | 2020-03-11 | 2020-07-03 | 东莞铭普光磁股份有限公司 | Optical module signal processing method and device and optical module |
| CN111970053A (en) * | 2020-08-11 | 2020-11-20 | 瑞泰(威海)电子科技有限公司 | Demodulation device for top modulation signal and optical module |
Non-Patent Citations (1)
| Title |
|---|
| 高建党: "《模拟电子技术实验实训与仿真》", 28 February 2011 * |
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