CN114696827A - Optical pilot tone adjusting method and device - Google Patents
Optical pilot tone adjusting method and device Download PDFInfo
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Abstract
The embodiment of the application discloses a light modulation signal adjusting method and a light modulation signal adjusting device, which are used for saving the cost of a micro-processing unit comprising an analog-digital converter and not influencing other operation and use of the analog-digital converter. The method is applied to a light pilot tone adjusting scene, an adjusting device converts light signals for adjustment into digital signals, then the digital signals are counted and accumulated in a preset period to obtain an accumulated value, the modulation amplitude of modulation signals in the light pilot tone is adjusted according to a preset threshold value, and the adjusted pilot tone is used as the light signals for adjustment in the next period to be readjusted.
Description
Technical Field
The present application relates to the field of communications, and in particular, to a method and an apparatus for adjusting an optical pilot tone.
Background
The Light Sensor (LS) is an in-band monitoring technique, and a single channel is monitored by loading a low-frequency (below several tens of megahertz (MHz)) modulation (pilot tone) on an optical wavelength channel at a high speed (above several gigahertz (GHz)). The frequency division technology is utilized, different LS pilot frequencies are loaded on different wavelengths, and multi-channel monitoring can be achieved. In the optical power detection and overhead transfer scenario, the optical modulation intensity (M _ op) is kept constant, the larger the modulation intensity is, the better the modulation intensity is, while the LS pilot is actually only an auxiliary channel, the most important function of the channel is to transfer traffic information, the LS pilot is noise relative to the traffic channel information, the larger the modulation depth is, the higher the corresponding cost is, therefore, M _ op needs to select a proper value and keep constant. However, in the actual use process, even if the electrical modulation signal loaded on the modulator can be maintained to be unchanged, the transfer characteristic of the modulator itself will change with temperature and pressure drift and aging, so the optical modulation depth needs to be adjusted, and the modulation depth represents the ratio of the amplitude of the low frequency component modulated on the original service signal dc power to the dc component.
The method comprises the steps of continuously sampling optical signal intensity at a sending end, carrying out Fourier transform on the time sequence optical signal intensity obtained by continuous sampling to obtain corresponding frequency domain data, respectively searching low frequency bands corresponding to direct current signals and frequency spectrum data corresponding to maximum frequency spectrums corresponding to modulation signals, and calculating the ratio of the low frequency bands to the modulation signals to obtain the light modulation depth.
However, in the above scheme, the sampling rate of the analog-to-digital converter (ADC) needs to be at least twice the pilot frequency, a Micro Control Unit (MCU) with a high sampling rate ADC has high cost, and continuous sampling of the ADC cannot be performed for other operations.
Disclosure of Invention
The application provides an optical pilot tone adjusting method and an optical pilot tone adjusting device, which are used for saving cost and do not influence other operation and use of an ADC.
A first aspect of the present application provides an optical pilot tone adjusting method, including: the adjusting device converts the target optical signal into a digital signal, wherein the target optical signal is an optical signal which is acquired in real time and is used for adjusting the modulation depth; the adjusting device counts and accumulates the digital signals in a preset period to obtain an accumulated value; the adjusting device adjusts the modulation amplitude of the pilot tone top signal according to the relation between the accumulated value and the preset threshold value, and outputs the pilot tone top signal, the pilot tone top signal is generated according to the digital signal and the adjustment amplitude, the pilot tone top signal comprises the pilot tone top signal, and the pilot tone top signal is the target optical signal of the next period.
In the first aspect, the adjusting device first obtains a target optical signal for adjusting the modulation depth or an optical pilot tone adjusted in a previous period in real time, then converts the target optical signal into a digital signal, so as to count and accumulate the digital signal in a preset period to obtain an accumulated value, and adaptively adjusts the modulation amplitude of the pilot tone in the optical pilot tone by comparing the accumulated value with a preset threshold value, so as to output the adjusted optical pilot tone. The adjusting device can also adjust the adjusted optical pilot tone signal again until the modulation depth of the optical pilot tone signal meets the requirements. Continuous sampling by the analog-to-digital converter is not needed, so that the cost can be saved, and other operation and use of the analog-to-digital converter are not influenced.
In one possible embodiment, the step of adjusting means adjusting the modulation amplitude of the pilot tone signal according to the relationship between the accumulated value and the preset threshold, and outputting the optical pilot tone signal includes: when the accumulated value is larger than a preset threshold value, the adjusting device reduces the modulation amplitude of the top-adjusting signal; when the accumulated value is smaller than a preset threshold value, the adjusting device increases the modulation amplitude of the top-adjusting signal; the adjusting device outputs an optical pilot tone signal comprising a modulation signal after the modulation amplitude is adjusted, so that the optical pilot tone signal is used as a target optical signal of the next period, and the modulation amplitude corresponding to the accumulated value with a smaller difference between the accumulated value and the preset threshold value is selected until the accumulated values of two adjacent periods are positioned at two sides of the preset threshold value.
In the above possible embodiment, for the target optical signal in each adjustment period, the adjustment device may adjust the modulation amplitude of the pilot tone signal, increase the modulation amplitude of the pilot tone signal when the accumulated value is smaller than the preset threshold, and decrease the modulation amplitude of the pilot tone signal when the accumulated value is larger than the preset threshold, so that the accumulated value of the optical pilot tone signal in the next period is closer to the preset threshold until the accumulated value in the previous period and the accumulated value in the present period are on both sides of the preset threshold, respectively, and then select the modulation amplitude in the period with a smaller difference between the accumulated value and the preset threshold as the final modulation amplitude, so that the modulation amplitude may be locked to ensure the auxiliary channel signal-to-noise ratio and the communication reliability.
In a possible embodiment, the step adjusting means adjusts the modulation amplitude of the pilot tone signal according to the relationship between the accumulated value and the preset threshold, and outputs the optical pilot tone signal includes: when the accumulated value is smaller than a preset threshold value, the adjusting device increases the modulation amplitude of the top-adjusting signal; the adjusting device outputs a light pilot tone signal including the modulation signal after the modulation amplitude is adjusted to take the light pilot tone signal as a target light signal of a next period until the accumulated value is greater than a preset threshold value.
In the above possible embodiment, for the target optical signal in each adjustment period, the adjustment device may adjust the modulation amplitude of the pilot signal, and increase the modulation amplitude of the pilot signal when the accumulated value is smaller than the preset threshold value until the accumulated value is larger than the preset threshold value, so as to provide a sufficiently large signal-to-noise ratio for the pilot information.
In one possible embodiment, the step of converting the target optical signal into a digital signal by the adjusting device comprises: the adjusting device converts the target optical signal into an electric signal and divides the electric signal into a direct current component and an alternating current component; the adjustment device amplifies the alternating current component and converts the amplified alternating current component into a digital signal according to a threshold level calculated from the direct current component.
In the above possible embodiment, the adjusting device converts the target optical signal into the electrical signal through the photoelectric effect, and since the average optical power value of the optical signal is not changed, the modulation depth can be adjusted by adjusting the amplitude of the optical signal.
In one possible embodiment, before the step of converting the amplified ac component into the digital signal according to the threshold level calculated by the dc component, the method further comprises: the adjusting device calculates the average light power value according to the direct current component; the adjusting device calculates modulation amplitude according to the average light power value and the preset light modulation depth; the adjusting means sets the threshold level in dependence on the modulation amplitude.
In the above possible embodiment, the adjusting device may receive the dc component through the analog-to-digital converter, calculate the average optical power, and obtain the preset optical modulation depth based on the relationship between the average optical power value, the modulation depth, and the modulation amplitude, and calculate the modulation amplitude. After the modulation amplitude is obtained by the adjusting means, the threshold level of the comparator converting the electrical signal into a digital signal can be set, which improves the feasibility of the solution.
The second aspect of the present application provides an adjustment device, comprising: the conversion unit is used for converting the target optical signal into a digital signal, wherein the target optical signal is an optical signal which is acquired in real time and is used for adjusting the modulation depth; the accumulation unit is used for counting and accumulating the digital signals in a preset period to obtain an accumulated value; and the sending unit is used for adjusting the modulation amplitude of the pilot tone top signal according to the relation between the accumulated value and the preset threshold value and outputting the pilot tone top signal, wherein the pilot tone top signal is generated according to the digital signal and the adjustment amplitude, the pilot tone top signal comprises the pilot tone top signal, and the pilot tone top signal is a target optical signal of the next period.
The adjusting device is configured to perform the method of the first aspect or any one of the embodiments of the first aspect.
A third aspect of the present application provides a computer device comprising: a processor for executing instructions stored in the memory to cause a computer device to perform the method provided by the first aspect or any of the alternatives of the first aspect, and a communication interface for receiving or sending an indication. For specific details of the computer device provided by the third aspect, reference may be made to the first aspect or any optional manner of the first aspect, and details are not described here.
A fourth aspect of the present application provides a computer-readable storage medium having a program stored therein, where the program, when executed by a computer, performs the method of the first aspect or any of the alternatives of the first aspect.
A fifth aspect of the present application provides a computer program product for performing the method of the first aspect or any of the alternatives of the first aspect when the computer program product is executed on a computer.
Drawings
Fig. 1 is an LS signal originating modulation architecture provided in an embodiment of the present application;
fig. 2 is a diagram illustrating an embodiment of a method for adjusting a pilot tone according to an embodiment of the present disclosure;
FIG. 3 is a flow chart of an adjustment method provided by an embodiment of the present application;
fig. 4 is another embodiment of a method for adjusting a pilot tone signal according to an embodiment of the present application;
FIG. 5 is a flow chart of an adjustment method provided by an embodiment of the present application;
FIG. 6 is a schematic diagram of an architecture of an adjusting device according to an embodiment of the present application;
FIG. 7 is a schematic diagram of a hysteresis comparator according to an embodiment of the present application;
FIG. 8 is a schematic structural diagram of an adjusting device provided in an embodiment of the present application;
fig. 9 is a schematic structural diagram of a computer device according to an embodiment of the present application.
Detailed Description
The embodiment of the application provides a method and a device for adjusting a light modulation and demodulation signal, which are used for saving the cost of an MCU (micro control unit) with a high sampling rate ADC (analog to digital converter) and avoiding influencing other operations and uses of the ADC.
Embodiments of the present application will now be described with reference to the accompanying drawings, and it is to be understood that the described embodiments are merely illustrative of some, but not all, embodiments of the present application. As can be known to those skilled in the art, with the development of technology and the emergence of new scenarios, the technical solution provided in the embodiments of the present application is also applicable to similar technical problems.
The terms "first," "second," and the like in the description and in the claims of the present application and in the above-described drawings are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It will be appreciated that the data so used may be interchanged under appropriate circumstances such that the embodiments described herein may be practiced otherwise than as specifically illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The word "exemplary" is used exclusively herein to mean "serving as an example, embodiment, or illustration. Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments.
Furthermore, in the following detailed description, numerous specific details are set forth in order to provide a better understanding of the present application. It will be understood by those skilled in the art that the present disclosure may be practiced without some of these specific details. In some instances, methods, means, elements and circuits that are well known to those skilled in the art have not been described in detail so as not to obscure the present disclosure.
The Light Sensor (LS) is an in-band monitoring technique, and a single channel is monitored by loading a low frequency (below several tens of megahertz (MHz)) modulation (pilot tone) on an optical wavelength channel at a high speed (above several gigahertz (GHz)). By using frequency division technology, different LS pilot frequencies are loaded on different wavelengths, and multi-channel monitoring can be realized.
The wavelength tracking technology (LS) is an optical channel state detection technology that identifies Dense Wavelength Division Multiplexing (DWDM) optical wavelength signals by using pilot signals based on amplitude modulation, and further implements wavelength path tracking, optical power reporting, and the like. The wavelength tracking technology can greatly improve the soft strength of the wavelength division product.
The modulation depth represents the ratio of the amplitude of the low frequency component modulated on the original traffic signal dc power to the dc component. The modulation depth is in turn divided into an electrical modulation depth M _ rf and an optical modulation depth M _ op.
Electrical modulation depth M _ rf:
in the above formula:
m _ rf: the depth is electrically modulated.
RF WT _ Vp: the peak-to-peak value of the oscillation amplitude is electrically modulated.
RF Vp: the electrical modulation signal mean.
RF Vpp _ wt: and adding the peak value of the electric signal of the low-frequency modulation signal.
RF Vpp _ avg: the peak-to-peak value of the electrical signal of the low-frequency modulation signal is not added.
Light modulation depth M _ op:
in the above formula:
m _ op: the light modulation depth.
P _ wt: the optical power modulates the peak-to-peak value of the oscillation amplitude.
P _ avg: average value of optical power.
The electrical modulation signal is set (i.e. the actual controllable signal) and then modulated onto the optical signal by the modulator, but the actual optical signal is influenced by the modulation amplitude and modulation depth after modulation, which is determined by the electrical modulation signal, as well as the transfer function of the modulator, and the threshold current of the laser in the directly modulated laser.
In the LS signal detection, ideally, the optical modulation depth M _ op is not changed by Wavelength Division Multiplexing (WDM) transmission, and the optical modulation depth M _ op may be detected by detecting the f in the optical signalnThe power of the frequency component estimates the optical carrier power. Each DWDM wavelength λnAre all by a unique frequency fnModulation depth M _ op is the same, and optical carrier central wavelength lambdanOptical power of and fnThe powers of (a) and (b) form a one-to-one correspondence. If the presence of a low-frequency signal f is detected at a certain detection point of the transmission systemnThen it can be judged that the center wavelength λ existsnWhile being dependent on the signal fnThe corresponding WDM channel wavelength lambda can be calculatednOf the optical power of (c).By recovering the lower frequency digital modulation ftx (t) on the Amplitude Modulation (AM) modulation, an auxiliary signal channel is realized, and more DWDM channel identification information is obtained.
Hereinafter, an application scenario of the present application is exemplarily described. The LS signal originating modulation architecture provided by the embodiment of the present application as shown in fig. 1 includes a central micro-processing unit, a traffic signal and pilot signal synthesizing unit, a modulator, and a Laser Diode (LD). The central micro-processing unit comprises an amplitude control subunit and a channel associated information subunit. The amplitude control subunit controls the modulation amplitude of the top-modulation signal, and the channel associated information subunit controls the overhead of the channel associated, i.e. the information of the top-modulation signal. The service signal and the tuning signal synthesis unit synthesizes a high-frequency service signal and a low-frequency tuning signal and then loads the synthesized signals on the modulator together, and the modulator modulates the synthesized signals into stable high-frequency radio frequency oscillation signals and converts the signals into optical signals through LD (laser diode) for output.
In the scene of optical power detection and overhead transmission, the light modulation intensity (M _ op) is kept constant, the larger the intensity is, the better the intensity is, while the LS pilot is actually an auxiliary channel, the most important function of the channel is to transmit traffic information, the LS pilot is noise relative to the traffic channel information, the larger the modulation depth is, the higher the corresponding cost is, and therefore, the M _ op needs to be selected to be a proper value and kept constant. However, in the actual usage process, even if the electrical modulation signal loaded on the modulator can be kept unchanged, the transmission characteristic of the modulator itself will change with temperature and pressure drift and aging, and therefore, the optical modulation depth needs to be adjusted, wherein the optical signal intensity is continuously sampled at the transmitting end, the time series optical signal intensity obtained by continuous sampling is fourier-transformed to obtain corresponding frequency domain data, the low frequency band corresponding to the dc signal and the spectral data corresponding to the maximum value of the spectrum corresponding to the modulation signal are respectively searched, and the optical modulation depth obtained by calculating the ratio of the two values can be used for adjusting the optical modulation depth, but in this scheme, the continuous sampling needs to be at least twice the pilot frequency, the Micro Control Unit (MCU) of the analog to digital converter (ADC) with a high sampling rate is costly, and the ADC continuous sampling cannot perform other operations, in order to solve the above problem, the present application provides a method for adjusting a tune-top signal, including: the adjusting device converts a target optical signal into a digital signal, wherein the target optical signal is an optical signal which is acquired in real time and used for adjusting the modulation depth; the adjusting device counts and accumulates the digital signals in a preset period to obtain an accumulated value; the adjusting device adjusts the modulation amplitude of the modulation signal according to the relation between the accumulated value and the preset threshold value, and outputs the optical pilot tone signal, wherein the modulation signal is generated according to the digital signal and the adjustment amplitude, the optical pilot tone signal comprises the modulation signal, and the optical pilot tone signal is the target optical signal of the next period. In this way, the cost of the MCU can be saved and other operational uses of the ADC avoided being affected.
Based on the above application scenarios, a method for adjusting a tune signal provided in the embodiment of the present application is described below.
The adjusting device of the embodiment of the application can keep the tuning-top depth at a constant value, and can only keep the tuning-top depth large enough to enable the pilot frequency information to have a signal-to-noise ratio large enough, so that the overhead information can be demodulated more conveniently.
First, the set top depth is maintained at a constant value.
Please refer to fig. 2, which illustrates an embodiment of a method for adjusting a pilot tone signal according to an embodiment of the present disclosure.
201. The conditioning device receives a target optical signal.
The target optical signal is a signal synthesized by a service signal and a pilot signal, wherein the modulation depth of the pilot signal needs to be adjusted correspondingly in order to avoid the influence that the transmission characteristic of the modulator can also change along with temperature and pressure drift and aging. In the embodiment of the application, the adjusting device acquires the target optical signal for adjusting the modulation depth in real time.
202. The conditioning device converts the target optical signal into an electrical signal.
After monitoring the target optical signal, the adjusting device can convert the target optical signal into an electrical signal by a photoelectric effect in order to process the optical signal.
203. The regulating device divides the electrical signal into a direct current component and an alternating current component.
After the adjusting device obtains the electrical signal, since the average optical power value of the optical signal is not changed, adjusting the modulation depth only requires adjusting the amplitude of the optical signal, so that the electrical signal can be divided into a direct current component and an alternating current component, so as to adjust the modulation amplitude of the alternating current component in the following.
204. The adjusting device calculates an average light power value based on the direct current component.
In this embodiment, the adjusting device may perform correlation calculation on the dc component divided by the electrical signal based on the correlation description of the calculated optical power in the LS signal detection, so as to obtain an average optical power value.
205. And the adjusting device calculates the modulation amplitude according to the average light power value and the preset light modulation depth.
In this embodiment, the average optical power P _ avg, the preset optical modulation depth M _ op, and the modulation amplitude P _ wt are preset constant modulation depths of the set top signal. The present embodiment can be based on the following formula
And calculating to obtain the modulation amplitude.
206. The adjusting means sets the threshold level in dependence on the modulation amplitude.
In this embodiment, the module for converting the ac component into the digital signal may be a comparator or an analog-to-digital converter, the comparator does not need to determine a specific value of the ac component and can quickly convert the ac component into the digital signal, the two analog-to-digital converters need a high-speed ADC for realizing quick conversion, and the MCU including the ADC has a high cost. The present embodiment can set the comparison threshold level V _ ref of the comparator according to the modulation amplitude P _ wt and the modulation depth M _ op as described above. The threshold level may be used for calculation of a decision level in the comparator, i.e. a decision level for the ac component may be obtained by calculation of the threshold level and the associated resistance value.
207. The adjustment means amplifies the alternating current component.
In the photoelectric module, the optical power of the detected optical signal is generally in the magnitude from μ W to mW, the current for converting the optical signal into an electrical signal is in the magnitude of nA, and for such weak current, the input current value cannot be accurately obtained by a general measurement method. The ac component can be amplified for processing by both current-to-voltage conversion (IV conversion) and current-to-frequency conversion (IF conversion).
Step 204 to step 206 may also be executed simultaneously with step 207 or after step 207, and only need to be executed before step 208.
208. The regulating device converts the amplified alternating current component into a digital signal.
In this embodiment, the adjusting device may convert the amplified alternating current component into a digital signal according to a relationship between the alternating current component and the decision level.
209. The adjusting device counts and accumulates the digital signals in a preset period to obtain an accumulated value.
In this embodiment, the predetermined period is a modulation period, and the modulation period is a continuous "1" signal whose ac component is greater than the decision level in step 208. Since the general overhead-carrying pilot signal is a "1" signal that modulates a sinusoidal signal of a particular frequency, while the "0" signal has no low-frequency modulation signal, the effective count period should be within one clock cycle and the duration of the overhead signal being a "1". The adjusting device counts and accumulates the "1" signal to obtain an accumulated value, for example, the adjusting device triggers the counter to clear and start counting at a rising edge of one clock of the digital signal, and triggers reading back the counting result at the next rising edge of the clock, such as the accumulated value mentioned above.
210. When the accumulated value is larger than the preset threshold value, the adjusting device reduces the modulation amplitude of the top-adjusting signal.
211. And when the accumulated value is smaller than the preset threshold value, the adjusting device increases the modulation amplitude of the tuning signal.
In steps 210 and 211, the adjusting device may adjust the modulation amplitude of the modulation signal based on the relationship between the accumulated value and the preset threshold, for example, as shown in the adjustment method flowchart shown in fig. 3, step 301 is to read the accumulated value counter by the adjusting device, step 302 is to calculate the comparison result Flag _ old of the counter and the preset threshold T as counter-T, that is, step 303 may be executed to adjust the modulation amplitude of the modulation signal according to the sign of Flag _ old, for example, when Flag _ old is a positive number, the adjusting device decreases the modulation amplitude of the pilot signal, and when Flag _ old is a negative number, the adjusting device increases the modulation amplitude of the pilot signal.
212. The adjusting device outputs an optical pilot tone signal including the pilot tone signal after adjusting the modulation amplitude to use the optical pilot tone signal as the target optical signal of the next period, and step 201 is executed again until the accumulated values of two adjacent periods are on both sides of the preset threshold, and the modulation amplitude corresponding to the accumulated value with a smaller difference between the accumulated value and the preset threshold is selected.
After the adjusting device adjusts the top-tone signal, the top-tone signal and the service signal are synthesized and converted into an optical signal to be sent out, and the adjusted optical signal can be used as a target optical signal of the next period for further adjustment. For example, as shown in fig. 3, in step 304, the adjusting apparatus reads the accumulated value counter again based on the target optical signal of the next cycle, step 305 is a new comparison result, Flag _ new is counter-T, step 306 determines whether the signs of Flag _ new and Flag _ old are the same, i.e. it can determine whether Flag _ new Flag _ old < 0 is accurate, if not, step 307 is executed, Flag _ old Flag _ new waits for the next target optical signal to execute step 303 again, if accurate, step 308 is executed to determine whether abs (Flag _ new) < abs (Flag _ old) is accurate, if abs (Flag _ new) is greater than abs (Flag _ old), step 309 is executed to reduce the amplitude of the top-modulated signal by one step cycle (step), if abs (Flag _ new) is less than abs (Flag _ old), then the adjustment depth is set to the minimum value, the adjustment depth is adjusted to the minimum value, and the adjustment depth is set to the minimum value of the top-modulated signal, step 310 may be performed to stop the adjustment.
The adjusting device converts the target optical signal into a digital signal and counts and accumulates the digital signal in a preset period to obtain an accumulated value, adjusts the modulation amplitude of the modulation signal in the optical pilot tone signal according to the accumulated value and a preset threshold value, and readjusts the adjusted pilot tone signal as the target optical signal of the next period without continuously sampling by the ADC, so that the cost can be saved, and other operations and uses of the ADC are not influenced.
Furthermore, an operational amplifier comparator (most of the MCUs are integrated in the MCU) is added, and even a digital input/output (IO) can be used in a part of scenes instead of the comparator, so that the method has no extra cost or hardware cost.
And secondly, only enough great topping depth is kept.
Please refer to fig. 4, which shows another embodiment of a method for adjusting a pilot tone signal according to an embodiment of the present application.
401. The conditioning device receives a target optical signal.
402. The conditioning device converts the target optical signal into an electrical signal.
403. The regulating device divides the electrical signal into a direct current component and an alternating current component.
404. The adjusting device calculates an average light power value based on the direct current component.
405. And the adjusting device calculates the modulation amplitude according to the average light power value and the preset light modulation depth.
406. The adjusting means sets the threshold level in dependence on the modulation amplitude.
407. The adjustment means amplifies the alternating current component.
408. The regulating device converts the amplified alternating current component into a digital signal.
409. The adjusting device counts and accumulates the digital signals in a preset period to obtain an accumulated value.
In this embodiment, reference may be made to the related description in steps 201 to 209 in steps 401 to 409, which are not described herein again.
410. And when the accumulated value is smaller than the preset threshold value, the adjusting device increases the modulation amplitude of the tuning signal.
In steps 210 and 211, the adjusting device may adjust the modulation amplitude of the modulation signal based on the relationship between the accumulated value and the preset threshold, for example, as shown in the adjustment method flowchart illustrated in fig. 5, step 501 is that the adjusting device reads the accumulated value counter, step 502 is to determine whether the counter is greater than the preset threshold T, for example, the counter > T, when the counter is less than T, step 503 is executed to increase the modulation amplitude of the top-tuning signal, each time the adjustment amplitude is a unit step of electrical modulation amplitude control, and the controllable minimum unit step is the detection accuracy of the present solution. If counter is greater than T, then step 504 is performed to stop the adjustment.
411. The adjusting device outputs an optical pilot tone signal including the pilot tone signal after the modulation amplitude is adjusted to use the optical pilot tone signal as the target optical signal of the next period, and step 401 is executed again until the accumulated value is greater than the preset threshold value.
And after adjusting the top-tone signal, the adjusting device synthesizes the top-tone signal and the service signal, converts the top-tone signal into an optical signal and sends out the optical signal, and if the counter is less than T, the adjusted optical signal can be used as a target optical signal of the next period for further adjustment. For example, as shown in fig. 5, after the adjusting device increases the modulation amplitude of the pilot tone signal and outputs the target optical signal of the next period in step 503, step 501 is executed again in the process of adjusting the modulation amplitude, if the counter is still less than T, step 503 is executed continuously until the counter of the adjusted optical pilot tone signal is greater than T, and step 504 is executed to stop the adjustment.
The adjusting device converts the target optical signal into a digital signal and counts and accumulates in a preset period to obtain an accumulated value, adjusts the modulation amplitude of the modulation signal in the optical pilot tone signal according to the accumulated value and a preset threshold value, and readjusts the adjusted pilot tone signal as the target optical signal of the next period without continuously sampling by the ADC, so that the cost can be saved, and other operations and uses of the ADC are not influenced.
For example, referring to fig. 6, an architecture diagram of the tuning apparatus in the embodiment of the present invention is shown, and the tuning apparatus may include a micro photo diode (mPD) 61, a dc blocking capacitor 62, an amplifier 63, a hysteresis comparator 64, a central microprocessor 65, a traffic signal and tuning signal synthesizing unit 66, a modulator 67, and a Laser Diode (LD) 68. Described below, respectively:
the mPD61 receives the optical signal from the laser diode 67, and performs steps 201 to 202 in the tuning signal adjusting method shown in fig. 2 or steps 401 to 402 in the tuning signal adjusting method shown in fig. 4.
The dc blocking capacitor 62 may perform step 203 in the tuning signal conditioning method shown in fig. 2 or step 403 in the tuning signal conditioning method shown in fig. 4.
The hysteresis comparator 64 may perform step 208 of FIG. 2 or step 408 of FIG. 4. The hysteresis comparator 64 is shown in fig. 7, and the hysteresis comparator 64 includes a comparator 641, a resistor R1, a resistor R2, a resistor R3, and a zener diode 642. The hysteresis comparator 64 is composed of two decision levels + Vom, -Vom and two output levels U + and U-; the output high and low level of the hysteresis comparator is determined by the power supply of the operational amplifier, and generally U + is 3.3V, U-0V; the decision level of the hysteresis comparator is determined by a threshold level V _ ref and resistors R1 and R2, and after the hardware design R1 and R2 determine, V _ ref is subjected to V _ ref _ set threshold control by the central micro-processing unit 65 according to the currently set light modulation depth M _ op _ set;
the central micro-processing unit 65 includes a counter 651, a threshold control subunit 652, a processing algorithm subunit 653, an amplitude control subunit 654, a channel information subunit 655, and an analog-to-digital converter (ADC) 656.
The analog-to-digital converter 656 may perform step 204 or step 404, i.e. calculate the dc component divided by the dc blocking capacitor 62. The processing algorithm subunit 653 may perform step 205 or step 405 and perform step 206 or step 406 through the threshold control subunit 652. The counter 651 can perform step 209 or step 409, and counts up the modulated signal period according to the signal sent from the hysteresis comparator 64 and sends the counted modulated signal period to the processing algorithm subunit 653. The channel associated information subunit 655 controls the counter to count and accumulate in the "1" signal modulation period, and the processing algorithm subunit 653 may further perform steps 210 to 211 or 210, obtain a counter value in the "1" signal modulation period, compare the counter value with the preset threshold T, if the counter value is greater than T, indicate that the current actual M _ op is greater than the preset M _ op _ set, otherwise, it is less than the preset M _ op _ set, if the actual M _ op is greater than the preset M _ op _ set, the electrical modulation amplitude is decreased by the amplitude control subunit 654, otherwise, the actual M _ op is less than the preset M _ op _ set, and the electrical modulation amplitude is increased by the amplitude control subunit 654. And the associated information subunit 655 outputs modulation information of the pilot tone signal, e.g., 1, 0, and the amplitude control subunit 654 controls the modulation amplitude of the pilot tone information.
The service signal and the pilot signal synthesis unit 66 combines the pilot signal output by the central microprocessor unit 65 and the dedicated service signal to generate a pilot signal, the modulator 67 modulates the pilot signal into a stable high-frequency rf oscillating signal, and the stable high-frequency rf oscillating signal is converted into an optical signal by the laser diode 68 to be transmitted, and the step 212 or the step 411 is executed together.
The above describes a method for adjusting a pilot tone signal, and the adjusting apparatus according to the embodiment of the present application is described below with reference to the drawings.
Fig. 8 is a schematic diagram of an embodiment of the adjusting device 80 in the embodiment of the present application.
As shown in fig. 8, an embodiment of the present application provides an adjustment device, including:
a conversion unit 801, configured to convert a target optical signal into a digital signal, where the target optical signal is an optical signal obtained in real time and used for adjusting a modulation depth;
an accumulation unit 802, configured to count and accumulate the digital signal in a preset period to obtain an accumulated value;
a sending unit 803, configured to adjust a modulation amplitude of the pilot tone top signal according to a relationship between the accumulated value and a preset threshold, and output a pilot tone top signal, where the pilot tone top signal is generated according to the digital signal and the adjustment amplitude, the pilot tone top signal includes the pilot tone top signal, and the pilot tone top signal is a target optical signal of a next period.
Optionally, the sending unit 803 is specifically configured to: when the accumulated value is larger than a preset threshold value, reducing the modulation amplitude of the top-adjusting signal; when the accumulated value is smaller than a preset threshold value, increasing the modulation amplitude of the top-regulating signal; and outputting a light pilot tone signal comprising the modulation signal after the modulation amplitude is adjusted, so that the light pilot tone signal is used as a target light signal of the next period, and selecting the modulation amplitude corresponding to the accumulated value with smaller difference between the accumulated value and the preset threshold value until the accumulated values of two adjacent periods are positioned at two sides of the preset threshold value.
Optionally, the sending unit 803 is specifically configured to: when the accumulated value is smaller than a preset threshold value, increasing the modulation amplitude of the top-adjusting signal; and outputting a light pilot tone signal comprising the modulation signal after the modulation amplitude is adjusted to take the light pilot tone signal as a target light signal of the next period until the accumulated value is greater than a preset threshold value.
Optionally, the conversion unit 801 is specifically configured to: converting the target optical signal into an electrical signal and dividing the electrical signal into a direct current component and an alternating current component; the alternating current component is amplified and converted into a digital signal according to a threshold level calculated from the direct current component.
Optionally, the adjusting apparatus 80 further includes a setting unit 804, and the setting unit 804 is specifically configured to: calculating an average light power value according to the direct current component; calculating modulation amplitude according to the average light power value and a preset light modulation depth; the threshold level is set according to the modulation amplitude.
Fig. 9 is a schematic diagram of a possible logical structure of a computer device 90 according to an embodiment of the present application. The computer device 90 includes: a processor 901, a communication interface 902, a storage system 903, and a bus 904. The processor 901, the communication interface 902, and the storage system 903 are connected to each other by a bus 904. In an embodiment of the present application, the processor 901 is configured to control and manage the actions of the computer device 90, for example, the computer device 90 is configured to execute the steps performed by the adjusting apparatus in the method embodiments of fig. 2 and fig. 4. Communication interface 902 is used to support communication for computer device 90. A storage system 903 for storing program codes and data for the computer device 90.
The processor 901 may be a central processing unit, a general purpose processor, a digital signal processor, an application specific integrated circuit, a field programmable gate array or other programmable logic device, a transistor logic device, a hardware component, or any combination thereof. Which may implement or perform the various illustrative logical blocks, modules, and circuits described in connection with the disclosure. The processor 901 may also be a combination of computing functions, e.g., comprising one or more microprocessors in combination, a digital signal processor and a microprocessor in combination, or the like. The bus 904 may be a Peripheral Component Interconnect (PCI) bus, an Extended Industry Standard Architecture (EISA) bus, or the like. The bus may be divided into an address bus, a data bus, a control bus, etc. For ease of illustration, only one thick line is shown in FIG. 9, but this does not indicate only one bus or one type of bus.
The sending unit 803 in the adjusting means 80 corresponds to the communication interface 902 in the computer device 90, and the converting unit 801, the accumulating unit 802 and the setting unit 804 in the adjusting means 80 may correspond to the processor 901.
The computer device 90 of this embodiment may correspond to the adjusting apparatus in each of the above method embodiments, and the processor 901 and the communication interface 902 in the computer device 90 may implement the functions of the adjusting apparatus and/or various steps implemented in each of the above method embodiments, which are not described herein again for brevity.
In another embodiment of the present application, a computer-readable storage medium is further provided, in which a computer executes instructions, and when a processor of the apparatus executes the computer to execute the instructions, the apparatus executes the steps of the tuning method performed by the tuning device in fig. 2 and 4.
In another embodiment of the present application, there is also provided a computer program product comprising computer executable instructions stored in a computer readable storage medium; when the processor of the device executes the computer-executable instructions, the device performs the steps of the set-top signal adjusting method performed by the adjusting apparatus of fig. 2 and 4.
Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the embodiments of the present application.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other manners. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one position, or may be distributed on multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit 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 may be substantially implemented or contributed to by the prior art, or all or part of the technical solution may be embodied in a software product, which is stored in a storage medium and includes 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 the like.
Claims (13)
1. A method of optical pilot tone adjustment, comprising:
the method comprises the steps that a target optical signal is converted into a digital signal by an adjusting device, wherein the target optical signal is an optical signal which is acquired in real time and used for adjusting modulation depth;
the adjusting device counts and accumulates the digital signals in a preset period to obtain an accumulated value;
the adjusting device adjusts the modulation amplitude of the pilot tone top signal according to the relation between the accumulated value and a preset threshold value, and outputs the pilot tone top signal, wherein the pilot tone top signal is generated according to the digital signal and the adjustment amplitude, the pilot tone top signal comprises the pilot tone top signal, and the pilot tone top signal is a target optical signal of the next period.
2. The method of claim 1, wherein the adjusting means adjusts the modulation amplitude of the pilot tone signal according to the relationship between the accumulated value and a predetermined threshold, and outputs the pilot tone signal comprises:
when the accumulated value is larger than the preset threshold value, the adjusting device reduces the modulation amplitude of the pilot tone signal;
when the accumulated value is smaller than the preset threshold value, the adjusting device increases the modulation amplitude of the pilot tone signal;
and the adjusting device outputs the optical pilot tone signal comprising the modulation signal after the modulation amplitude is adjusted so as to take the optical pilot tone signal as a target optical signal of the next period, and selects the modulation amplitude corresponding to the accumulated value with smaller difference between the accumulated value and the preset threshold value until the accumulated values of two adjacent periods are positioned at two sides of the preset threshold value.
3. The method of claim 1, wherein the adjusting means adjusts the modulation amplitude of the pilot tone signal according to the relationship between the accumulated value and a predetermined threshold, and outputting the optical pilot tone signal comprises:
when the accumulated value is smaller than the preset threshold value, the adjusting device increases the modulation amplitude of the pilot tone signal;
the adjusting device outputs the optical pilot tone signal including the modulation signal after the modulation amplitude is adjusted, so that the optical pilot tone signal is used as a target optical signal of the next period until the accumulated value is larger than the preset threshold value.
4. The optical pilot tone adjustment method of any one of claims 1 to 3, wherein the adjusting device converting the target optical signal into a digital signal comprises:
the adjusting device converts the target optical signal into an electric signal and divides the electric signal into a direct current component and an alternating current component;
the adjusting device amplifies the alternating current component and converts the amplified alternating current component into the digital signal according to a threshold level calculated by the direct current component.
5. The method of claim 4, wherein before converting the amplified ac component to the digital signal based on the threshold level calculated for the dc component, the method further comprises:
the adjusting device calculates an average light power value according to the direct current component;
the adjusting device calculates modulation amplitude according to the average light power value and a preset light modulation depth;
the adjusting means sets the threshold level in dependence on the modulation amplitude.
6. An adjustment device, comprising:
the conversion unit is used for converting a target optical signal into a digital signal, wherein the target optical signal is an optical signal which is acquired in real time and used for adjusting the modulation depth;
the accumulation unit is used for counting and accumulating the digital signals in a preset period to obtain an accumulated value;
and the sending unit is used for adjusting the modulation amplitude of the pilot tone top signal according to the relation between the accumulated value and a preset threshold value and outputting the pilot tone top signal, wherein the pilot tone top signal is generated according to the digital signal and the adjustment amplitude, the pilot tone top signal comprises the pilot tone top signal, and the pilot tone top signal is a target optical signal of the next period.
7. The adjusting apparatus according to claim 6, wherein the sending unit is specifically configured to:
when the accumulated value is larger than the preset threshold value, reducing the modulation amplitude of the pilot tone signal;
when the accumulated value is smaller than the preset threshold value, increasing the modulation amplitude of the pilot tone signal;
and outputting the optical pilot tone signal comprising the modulation signal after the modulation amplitude is adjusted so as to take the optical pilot tone signal as a target optical signal of the next period, and selecting the modulation amplitude corresponding to the accumulated value with a smaller difference value between the accumulated value and the preset threshold value until the accumulated values of two adjacent periods are positioned at two sides of the preset threshold value.
8. The adjusting apparatus according to claim 6, wherein the sending unit is specifically configured to:
when the accumulated value is smaller than the preset threshold value, increasing the modulation amplitude of the top-adjusting signal;
and outputting the light pilot tone signal comprising the modulation signal after the modulation amplitude is adjusted to take the light pilot tone signal as a target light signal of the next period until the accumulated value is greater than the preset threshold value.
9. The adjusting apparatus according to any one of claims 6 to 8, characterized in that the conversion unit is specifically configured to:
converting the target optical signal into an electrical signal and dividing the electrical signal into a direct current component and an alternating current component;
and amplifying the alternating current component, and converting the amplified alternating current component into the digital signal according to the threshold level calculated by the direct current component.
10. The adjusting apparatus according to claim 9, characterized in that the adjusting apparatus further comprises a setting unit, the setting unit being specifically configured to:
calculating an average light power value according to the direct current component;
calculating modulation amplitude according to the average light power value and a preset light modulation depth;
setting the threshold level in accordance with the modulation amplitude.
11. A computer device, comprising: a processor and a memory, wherein the processor is connected with the memory,
the processor is configured to execute instructions stored in the memory to cause the computer device to perform the method of any of claims 1 to 5.
12. A computer-readable storage medium, in which a computer program is stored which, when run on the computer, causes the computer to carry out the method according to any one of claims 1 to 5.
13. A computer program product, characterized in that when the computer program product is executed on a computer, the computer performs the method according to any of claims 1 to 5.
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|---|---|---|---|
| CN202011637056.XA CN114696827A (en) | 2020-12-31 | 2020-12-31 | Optical pilot tone adjusting method and device |
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| CN202011637056.XA CN114696827A (en) | 2020-12-31 | 2020-12-31 | Optical pilot tone adjusting method and device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024061171A1 (en) * | 2022-09-19 | 2024-03-28 | 华为技术有限公司 | Optical module, optical communication device, and optical communication system |
| WO2024139591A1 (en) * | 2022-12-30 | 2024-07-04 | 华为技术有限公司 | Optical channel protection group switching method and related apparatus |
-
2020
- 2020-12-31 CN CN202011637056.XA patent/CN114696827A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024061171A1 (en) * | 2022-09-19 | 2024-03-28 | 华为技术有限公司 | Optical module, optical communication device, and optical communication system |
| WO2024139591A1 (en) * | 2022-12-30 | 2024-07-04 | 华为技术有限公司 | Optical channel protection group switching method and related apparatus |
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