CN112993737B - Laser extinction ratio control method and device, terminal equipment and storage medium - Google Patents

Laser extinction ratio control method and device, terminal equipment and storage medium Download PDF

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CN112993737B
CN112993737B CN202110088739.2A CN202110088739A CN112993737B CN 112993737 B CN112993737 B CN 112993737B CN 202110088739 A CN202110088739 A CN 202110088739A CN 112993737 B CN112993737 B CN 112993737B
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laser
extinction ratio
adjusting
optical power
double closed
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CN112993737A (en
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张豪
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Shenzhen Lianzhou International Technology Co Ltd
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Shenzhen Lianzhou International Technology Co Ltd
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S5/00—Semiconductor lasers
    • H01S5/06—Arrangements for controlling the laser output parameters, e.g. by operating on the active medium
    • H01S5/068—Stabilisation of laser output parameters
    • H01S5/0683—Stabilisation of laser output parameters by monitoring the optical output parameters
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
    • H01S3/13—Stabilisation of laser output parameters, e.g. frequency or amplitude
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
    • H01S3/13—Stabilisation of laser output parameters, e.g. frequency or amplitude
    • H01S3/1305—Feedback control systems

Abstract

The invention discloses a method and a device for controlling the extinction ratio of a laser, a terminal device and a storage medium, and relates to the technical field of optical communication, wherein the method for controlling the extinction ratio of the laser comprises the following steps: acquiring a first extinction ratio of the laser and a second extinction ratio of the laser after double closed-loop control; comparing the second extinction ratio with the first extinction ratio and a preset extinction ratio; and adjusting the output extinction ratio of the laser according to the comparison result. The embodiment of the invention can reduce the influence of the saturation of the optical power of the laser on the extinction ratio at high temperature, control the size of the extinction ratio by dynamically adjusting the optical power, enable the laser to meet the performance parameter requirement in the communication process, and effectively prevent the problem that the average optical power is smaller when the extinction ratio meets the performance requirement by adding a mechanism for comparing the average optical power of the laser after double closed-loop control with the minimum average optical power.

Description

Laser extinction ratio control method and device, terminal equipment and storage medium
Technical Field
The invention relates to the technical field of optical communication, in particular to a method and a device for controlling an extinction ratio of a laser, a terminal device and a storage medium.
Background
The Optical Network Unit (ONU) dual closed-loop control includes Automatic Power Control (APC) and Extinction Ratio Control (ERC), the working efficiency of a Laser Diode (LD) used in the ONU is affected by temperature, and as the temperature increases, the output optical power of the LD becomes smaller under the same driving current, and even saturation occurs. Under the condition that the LD is not saturated, under the condition of double closed loops of APC and ERC in the ONU, the stability of the average optical power and the extinction ratio at different temperatures can be ensured. However, due to the temperature characteristics of the LD, the optical power of the LD is often saturated at high temperatures, resulting in a problem of a low extinction ratio.
In the current common method for controlling the extinction ratio, one method is to fit a relation curve of the threshold current of the laser changing along with the temperature, and then convert the relation curve to obtain an initial curve of the modulation current changing along with the temperature required by the stable extinction ratio output. When the external temperature changes, the modulation current of the laser can be adjusted through the modulation current calculated according to the curve relation by the measured temperature, the extinction ratio is controlled in real time, and therefore the stability of the extinction ratio is achieved. When the consistency of the chip and the extinction ratio of the laser at high and low temperatures deviate from a stable value, the currently required modulation current is calculated in a reverse mode through the monitored actual value of the extinction ratio, so that a correction curve for fitting the modulation current is fed back, and the stability of the extinction ratio of the laser is improved. The other is to realize the control of extinction ratio by adding an optical module extinction ratio self-adapting device, and the device can automatically correct the bias current and the modulation current acting on the laser according to the change of the laser current, thereby realizing the stable output of the optical power and the extinction ratio of the optical module at different temperatures.
However, the first method only simply emphasizes the control of the extinction ratio, since the extinction ratio and the average optical power are both controlled by the bias current and the modulation current, both of which are important performance parameters of the ONU, but the optical power control in the ONU is usually more stable at present, and the extinction ratio control is more complicated. Second method most of the current optical chip schemes have adopted a double closed-loop control mechanism, but the control of the extinction ratio still often has an inaccurate problem. Because the consistency of the lasers is poor, the driving efficiency of different lasers is different, and the extinction ratio at high temperature often changes greatly, the method is only closed-loop control which is provided aiming at the current common situation, and the extinction ratio can not be controlled better when the situation of optical power saturation at high temperature is met.
Disclosure of Invention
The technical problem to be solved by the embodiments of the present invention is to provide a method, an apparatus, a terminal device and a storage medium for controlling an extinction ratio of a laser, which can reduce the influence of saturation of optical power of the laser on the extinction ratio at a high temperature, and control the size of the extinction ratio by dynamically adjusting the optical power, so that the laser meets the performance parameter requirement in a communication process.
In order to achieve the above object, an embodiment of the present invention provides a method for controlling an extinction ratio of a laser, including:
acquiring a first extinction ratio of the laser and a second extinction ratio of the laser after double closed-loop control;
comparing the second extinction ratio with the first extinction ratio and a preset extinction ratio;
and adjusting the output extinction ratio of the laser according to the comparison result.
Further, the adjusting the output extinction ratio of the laser according to the comparison result specifically includes:
if the second extinction ratio is not smaller than the preset extinction ratio, the second extinction ratio is used as the output extinction ratio of the laser;
and if the second extinction ratio is smaller than the preset extinction ratio, adjusting the output extinction ratio of the laser by adjusting the bias current of the laser.
Further, the adjusting the output extinction ratio of the laser by adjusting the bias current of the laser specifically includes:
if it is
Figure GDA0003547230220000021
Then EX is set2＝EX1(ii) a Wherein p is1' denotes the laser plus bias current I after double closed-loop controlbias2And modulating the current Imod2Optical power of p1Indicating laser plus bias current Ibias1And modulating the current Imod1Optical power of lower, EX2Representing said second extinction ratio, EX1Representing the first extinction ratio;
according to
Figure GDA0003547230220000031
Adjusting the average light power of the laser after the double closed-loop control; wherein, p'avgRepresenting the average optical power, p, of the laser after double closed-loop controlavgRepresents the average optical power of the laser;
adjusting bias current I of laser controlled by double closed loopsbias2Of so that p'avgSatisfy the requirement of
Figure GDA0003547230220000032
Therefore, the output extinction ratio of the laser can be adjusted.
Further, the said is according to
Figure GDA0003547230220000033
Before the average optical power of the laser after the double closed-loop control is adjusted, the method further includes:
is provided with p'avg＝50％pavgAs the minimum average optical power of the laser after double closed-loop control.
Further, the adjusting the output extinction ratio of the laser by adjusting the bias current of the laser further includes:
if it is
Figure GDA0003547230220000034
Then EX is set2＝EX0＝EXmin(ii) a Wherein, EX0Representing the preset extinction ratio; EXminRepresents the minimum value of the output extinction ratio;
according to
Figure GDA0003547230220000035
Adjusting the average light power of the laser after the double closed-loop control;
adjusting bias current I of laser controlled by double closed loopsbias2Of so that p'avgSatisfy the requirement of
Figure GDA0003547230220000036
Therefore, the output extinction ratio of the laser can be adjusted.
Further, said is according to
Figure GDA0003547230220000037
Before the average optical power of the laser after the double closed-loop control is adjusted, the method further includes:
if p'avg<50％pavgThen the laser is loweredThe temperature is used.
Further, the bias current I of the laser after the double closed-loop control is adjustedbias2Before, still include:
if Ibias2<IthThe use temperature of the laser is lowered.
The embodiment of the invention also provides a device for controlling the extinction ratio of the laser, which comprises:
the acquisition module is used for acquiring a first extinction ratio of the laser and a second extinction ratio of the laser after double closed-loop control;
the comparison module is used for comparing the second extinction ratio with the first extinction ratio and a preset extinction ratio;
and the adjusting module is used for adjusting the output extinction ratio of the laser according to the comparison result.
The embodiment of the present invention further provides a terminal device, which includes a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, and when the processor executes the computer program, the processor implements the laser extinction ratio control method described in any one of the above.
The embodiment of the present invention further provides a computer-readable storage medium, where the computer-readable storage medium includes a stored computer program, where when the computer program runs, the apparatus where the computer-readable storage medium is located is controlled to execute any one of the above methods for controlling an extinction ratio of a laser.
Compared with the prior art, the laser extinction ratio control method, the laser extinction ratio control device, the terminal equipment and the storage medium provided by the embodiment of the invention have the beneficial effects that: the first extinction ratio of the laser and the second extinction ratio of the laser after double closed-loop control are obtained; comparing the second extinction ratio with the first extinction ratio and a preset extinction ratio; and adjusting the output extinction ratio of the laser according to the comparison result. The embodiment of the invention can reduce the influence of the saturation of the optical power of the laser on the extinction ratio at high temperature, control the size of the extinction ratio by dynamically adjusting the optical power, enable the laser to meet the performance parameter requirement in the communication process, and effectively prevent the problem that the average optical power is smaller when the extinction ratio meets the performance requirement by adding a mechanism for comparing the average optical power of the laser after double closed-loop control with the minimum average optical power.
Drawings
FIG. 1 is a schematic flow chart diagram illustrating a method for controlling the extinction ratio of a laser according to a preferred embodiment of the present invention;
FIG. 2 is a P-I graph of a laser in a preferred embodiment of a method for controlling the extinction ratio of the laser according to the present invention;
FIG. 3 is a schematic structural diagram of a preferred embodiment of a laser extinction ratio control apparatus provided in the present invention;
fig. 4 is a schematic structural diagram of a preferred embodiment of a terminal device provided by the present invention.
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, fig. 1 is a schematic flow chart of a method for controlling an extinction ratio of a laser according to a preferred embodiment of the present invention. The laser extinction ratio control method comprises the following steps:
s1, acquiring a first extinction ratio of the laser and a second extinction ratio of the laser after double closed-loop control;
s2, comparing the second extinction ratio with the first extinction ratio and a preset extinction ratio;
and S3, adjusting the output extinction ratio of the laser according to the comparison result.
It should be noted that, due to the temperature characteristics of the laser diode LD, the ONU often has a low extinction ratio at high temperatureUsually caused by LD saturation at high temperatures. Referring to fig. 2, fig. 2 is a P-I graph of a laser in a preferred embodiment of a method for controlling an extinction ratio of the laser according to the present invention. To maintain the average optical power constant, p is increased0Resulting in a smaller extinction ratio. Because, when the temperature rises to T2When is, p1In the presence of saturation, in order to maintain the average optical power p during the double closed-loop control of the optical poweravgIf not, then p is increased0Will appear p1′<p1，p0′>p0Due to the fact that
Figure GDA0003547230220000061
Then
Figure GDA0003547230220000062
I.e., extinction becomes less and, in the severe cases, less than 10dB (the extinction ratio of the optical signal is greater than 10dB as specified in the GPON protocol), it is possible to reduce pavgTo alleviate the problem of reduced extinction ratio, since p is reducedavgThen p is0″<p0', then
Figure GDA0003547230220000063
Wherein p is0"indicates that p is decreasedavgApplying a bias current I to the rear laserbias2Optical power of.
Specifically, first, a first extinction ratio of the laser is obtained
Figure GDA0003547230220000064
And according to the obtained p after double closed-loop control at high temperature0' and p1' calculating to obtain the second extinction ratio of the laser
Figure GDA0003547230220000065
Then, the second extinction ratio EX of the laser is set2And first extinction ratio EX of the laser1And a predetermined extinction ratio EX0Comparing; and finally, adjusting the output extinction ratio of the laser according to the comparison result.
The embodiment of the invention can reduce the influence of the saturation of the optical power of the laser on the extinction ratio at high temperature, and the extinction ratio is controlled by dynamically adjusting the optical power, so that the laser meets the performance parameter requirement in the communication process.
In another preferred embodiment, the adjusting the output extinction ratio of the laser according to the comparison result specifically includes:
if the second extinction ratio is not smaller than the preset extinction ratio, the second extinction ratio is used as the output extinction ratio of the laser;
and if the second extinction ratio is smaller than the preset extinction ratio, adjusting the output extinction ratio of the laser by adjusting the bias current of the laser.
In particular, if the second extinction ratio EX of the laser2Not less than a predetermined extinction ratio EX0I.e. EX0≤EX2<EX1If so, indicating that the second extinction ratio of the laser meets the performance parameter requirement in the communication process, and taking the second extinction ratio as the output extinction ratio of the laser; if the second extinction EX2The ratio is less than the preset extinction ratio EX0I.e. EX2<EX0If the second extinction ratio of the laser is too low, the second extinction ratio of the laser needs to be adjusted, and the output extinction ratio of the laser is adjusted by adjusting the bias current of the laser.
It should be noted that the second extinction ratio of the laser after the double closed-loop control at high temperature is smaller than the first extinction ratio of the laser, i.e. EX2<EX1Therefore, when comparing the second extinction ratio of the laser with the preset extinction, the comparison of the second extinction ratio with the first extinction ratio is omitted, and the default second extinction ratio is smaller than the first extinction ratio, namely EX2<EX1。
After the laser is subjected to double closed-loop control, the embodiment of the invention firstly judges that the extinction ratio meets the performance parameter requirement in the communication process, and if the extinction ratio meets the communication performance requirement, the extinction ratio does not need to be adjusted; if the communication performance requirement is not met, the extinction ratio is adjusted, so that waste of control resources can be reduced.
In another preferred embodiment, the adjusting the output extinction ratio of the laser by adjusting the bias current of the laser specifically includes:
if it is
Figure GDA0003547230220000071
Then EX is set2＝EX1(ii) a Wherein p is1' denotes the laser plus bias current I after double closed-loop controlbias2And modulating the current Imod2Optical power of p1Indicating laser plus bias current Ibias1And modulating the current Imod1Optical power of lower, EX2Representing said second extinction ratio, EX1Representing the first extinction ratio;
according to
Figure GDA0003547230220000072
Adjusting the average light power of the laser after the double closed-loop control; wherein, p'avgRepresenting the average optical power, p, of the laser after double closed-loop controlavgRepresents the average optical power of the laser;
adjusting bias current I of laser controlled by double closed loopsbias2Of so that p'avgSatisfy the requirement of
Figure GDA0003547230220000073
Therefore, the output extinction ratio of the laser can be adjusted.
Specifically, when the output extinction ratio of the laser is adjusted by adjusting the bias current of the laser, the laser may be operated in a state where the output extinction ratio is adjusted
Figure GDA0003547230220000074
Then EX is set2＝EX1Then according to EX2＝EX1、
Figure GDA0003547230220000075
And
Figure GDA0003547230220000076
to obtain
Figure GDA0003547230220000081
Then according to
Figure GDA0003547230220000082
And
Figure GDA0003547230220000083
to obtain
Figure GDA0003547230220000084
Thereby according to
Figure GDA0003547230220000085
Adjusting the average light power of the laser after the double closed-loop control; adjusting bias current I of laser controlled by double closed loopsbias2So that p'avgSatisfy the requirement of
Figure GDA0003547230220000086
Therefore, the output extinction ratio of the laser can be adjusted.
Preferably, said base station is
Figure GDA0003547230220000087
Before the average optical power of the laser after the double closed-loop control is adjusted, the method further includes:
is provided with p'avg＝50％pavgAs the minimum average optical power of the laser after double closed-loop control.
It should be noted that, at present, the target optical power is usually set to be about 1 to 3dBm, and the optical power range required by the protocol is 0 to 5dBm, therefore, the embodiment of the invention sets p'avg＝50％pavgAs the minimum average optical power of the laser after double closed-loop control.
In a further preferred embodiment, the adjusting the output extinction ratio of the laser by adjusting the bias current of the laser further includes:
if it is
Figure GDA0003547230220000088
Then EX is set2＝EX0＝EXmin(ii) a Wherein, EX0Representing the preset extinction ratio; EXminRepresents the minimum value of the output extinction ratio;
according to
Figure GDA0003547230220000089
Adjusting the average light power of the laser after the double closed-loop control;
adjusting bias current I of laser controlled by double closed loopsbias2Of so that p'avgSatisfy the requirements of
Figure GDA00035472302200000810
Therefore, the output extinction ratio of the laser can be adjusted.
Specifically, when the output extinction ratio of the laser is adjusted by adjusting the bias current of the laser, the laser may be operated in a state where the output extinction ratio is adjusted
Figure GDA00035472302200000811
Then EX is set2＝EX0＝EXmin10, then according to EX210 and
Figure GDA00035472302200000812
to obtain
Figure GDA0003547230220000091
Then according to
Figure GDA0003547230220000092
And
Figure GDA0003547230220000093
to obtain
Figure GDA0003547230220000094
Thereby according to
Figure GDA0003547230220000095
Adjusting the average light power of the laser after the double closed-loop control; adjusting bias current I of laser controlled by double closed loopsbias2Of so that p'avgSatisfy the requirement of
Figure GDA0003547230220000096
Therefore, the output extinction ratio of the laser can be adjusted.
Incidentally, EXminRepresents the minimum value of the output extinction ratio, the lower limit of which is 10, and therefore, in the present embodiment, EX is set2＝EX0＝EXmin＝10。
Preferably, said base station is
Figure GDA0003547230220000097
Before the average optical power of the laser after the double closed-loop control is adjusted, the method further includes:
if p'avg<50％pavgThe use temperature of the laser is lowered.
In particular, according to
Figure GDA0003547230220000098
And
Figure GDA0003547230220000099
to obtain
Figure GDA00035472302200000910
Then, if p'avg<50％pavgIt shows that the extinction ratio of the laser cannot be adjusted to meet the performance parameter requirement at the high temperature, so that the use temperature of the laser needs to be reduced.
According to the embodiment of the invention, a mechanism for comparing the average optical power of the laser subjected to double closed-loop control with the minimum average optical power is added, so that the problem that the average optical power is smaller when the extinction ratio meets the performance requirement can be effectively prevented.
Preferably, the adjustment is viaBias current I of laser after double closed-loop controlbias2Before, still include:
if Ibias2<IthThe use temperature of the laser is lowered.
In particular, and adjusting the bias current I of the laser after the double closed-loop controlbias2First, determine Ibias2And IthThe magnitude of (A) is in the case of Ibias2<IthIf the extinction ratio of the laser cannot be adjusted to meet the performance parameter requirement, the laser cannot emit light normally, and the use temperature of the laser needs to be reduced.
Correspondingly, the invention also provides a laser extinction ratio control device, which can realize all the processes of the laser extinction ratio control method in the embodiment.
Referring to fig. 3, fig. 3 is a schematic structural diagram of a preferred embodiment of a laser extinction ratio control apparatus according to the present invention. The laser extinction ratio control device comprises:
an obtaining module 301, configured to obtain a first extinction ratio of a laser and a second extinction ratio of the laser after being controlled by a double closed loop;
a comparing module 302, configured to compare the second extinction ratio with the first extinction ratio and a preset extinction ratio;
and the adjusting module 303 is configured to adjust an output extinction ratio of the laser according to the comparison result.
Preferably, the adjusting module 303 specifically includes:
if the second extinction ratio is not smaller than the preset extinction ratio, the second extinction ratio is used as the output extinction ratio of the laser;
and if the second extinction ratio is smaller than the preset extinction ratio, adjusting the output extinction ratio of the laser by adjusting the bias current of the laser.
Preferably, the adjusting the output extinction ratio of the laser by adjusting the bias current of the laser specifically includes:
if it is
Figure GDA0003547230220000101
Then EX is set2＝EX1(ii) a Wherein p is1' denotes the laser plus bias current I after double closed-loop controlbias2And modulating the current Imod2Optical power of p1Indicating laser plus bias current Ibias1And modulating the current Imod1Optical power of lower, EX2Representing said second extinction ratio, EX1Representing the first extinction ratio;
according to EX2＝EX1、
Figure GDA0003547230220000102
And
Figure GDA0003547230220000103
to obtain
Figure GDA0003547230220000104
Wherein p is0' denotes the laser plus bias current I after double closed-loop controlbias2Optical power of p0Indicating laser bias current Ibias1Optical power of;
according to
Figure GDA0003547230220000111
And
Figure GDA0003547230220000112
to obtain
Figure GDA0003547230220000113
Therefore, the average light power of the laser controlled by the double closed loops is adjusted; wherein, p'avgRepresenting the average optical power, p, of the laser after double closed-loop controlavgRepresents the average optical power of the laser;
adjusting bias current I of laser controlled by double closed loopsbias2So that
Figure GDA0003547230220000114
Therefore, the output extinction ratio of the laser can be adjusted.
Preferably, said is according to
Figure GDA0003547230220000115
And
Figure GDA0003547230220000116
to obtain
Figure GDA0003547230220000117
Then, the method further comprises the following steps:
is provided with p'avg＝50％pavgAs the minimum average optical power of the laser after double closed-loop control.
Preferably, the adjusting the output extinction ratio of the laser by adjusting the bias current of the laser further comprises:
if it is
Figure GDA0003547230220000118
Then EX is set2＝EX010; wherein, EX0Representing the preset extinction ratio;
according to EX210 and
Figure GDA0003547230220000119
to obtain
Figure GDA00035472302200001110
According to
Figure GDA00035472302200001111
And
Figure GDA00035472302200001112
to obtain
Figure GDA00035472302200001113
Therefore, the average light power of the laser controlled by the double closed loops is adjusted;
adjusting bias current I of laser controlled by double closed loopsbias2So that
Figure GDA00035472302200001114
Therefore, the output extinction ratio of the laser can be adjusted.
Preferably, said is according to
Figure GDA00035472302200001115
And
Figure GDA00035472302200001116
to obtain
Figure GDA00035472302200001117
Then, the method further comprises the following steps:
if p'avg<50％pavgThe use temperature of the laser is lowered.
Preferably, the bias current I of the laser after the double closed-loop control is adjustedbias2Before, still include:
if Ibias2<IthThe use temperature of the laser is lowered.
In a specific implementation, the working principle, the control flow and the technical effect of the laser extinction ratio control device provided in the embodiment of the present invention are the same as those of the laser extinction ratio control method in the above embodiment, and are not described herein again.
Referring to fig. 4, fig. 4 is a schematic structural diagram of a terminal device according to a preferred embodiment of the present invention. The terminal device comprises a processor 401, a memory 402 and a computer program stored in the memory 402 and configured to be executed by the processor 401, wherein the processor 401 implements the laser extinction ratio control method according to any one of the above embodiments when executing the computer program.
Preferably, the computer program may be divided into one or more modules/units (e.g., computer program 1, computer program 2, … …) that are stored in the memory 402 and executed by the processor 401 to implement the invention. The one or more modules/units may be a series of computer program instruction segments capable of performing specific functions, which are used for describing the execution process of the computer program in the terminal device.
The Processor 401 may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other Programmable logic device, a discrete Gate or transistor logic device, a discrete hardware component, etc., the general purpose Processor may be a microprocessor, or the Processor 401 may be any conventional Processor, the Processor 401 is a control center of the terminal device, and various interfaces and lines are used to connect various parts of the terminal device.
The memory 402 mainly includes a program storage area and a data storage area, wherein the program storage area may store an operating system, an application program required for at least one function, and the like, and the data storage area may store related data and the like. In addition, the memory 402 may be a high speed random access memory, a non-volatile memory such as a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash Card (Flash Card), and the like, or the memory 402 may be other volatile solid state memory devices.
It should be noted that the terminal device may include, but is not limited to, a processor and a memory, and those skilled in the art will understand that the structural diagram of fig. 4 is only an example of the terminal device and does not constitute a limitation of the terminal device, and may include more or less components than those shown in the drawing, or combine some components, or different components.
The embodiment of the present invention further provides a computer-readable storage medium, where the computer-readable storage medium includes a stored computer program, and when the computer program runs, the apparatus where the computer-readable storage medium is located is controlled to execute the method for controlling an extinction ratio of a laser according to any one of the above embodiments.
The embodiment of the invention provides a method and a device for controlling the extinction ratio of a laser, terminal equipment and a storage medium, wherein a first extinction ratio of the laser and a second extinction ratio of the laser after double closed-loop control are obtained; comparing the second extinction ratio with the first extinction ratio and a preset extinction ratio; and adjusting the output extinction ratio of the laser according to the comparison result. The embodiment of the invention can reduce the influence of the saturation of the optical power of the laser on the extinction ratio at high temperature, control the size of the extinction ratio by dynamically adjusting the optical power, enable the laser to meet the performance parameter requirement in the communication process, and effectively prevent the problem that the average optical power is smaller when the extinction ratio meets the performance requirement by adding a mechanism for comparing the average optical power of the laser after double closed-loop control with the minimum average optical power.
It should be noted that the above-described system embodiments are merely illustrative, where the units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. In addition, in the drawings of the embodiment of the system provided by the present invention, the connection relationship between the modules indicates that there is a communication connection between them, and may be specifically implemented as one or more communication buses or signal lines. One of ordinary skill in the art can understand and implement it without inventive effort.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.

Claims (8)

1. A method for controlling an extinction ratio of a laser, comprising:
acquiring a first extinction ratio of the laser and a second extinction ratio of the laser after double closed-loop control;
comparing the second extinction ratio with the first extinction ratio and a preset extinction ratio;
adjusting the output extinction ratio of the laser according to the comparison result;
wherein, the adjusting the output extinction ratio of the laser according to the comparison result specifically includes:
if the second extinction ratio is not smaller than the preset extinction ratio, the second extinction ratio is used as the output extinction ratio of the laser;
if the second extinction ratio is smaller than the preset extinction ratio, adjusting the output extinction ratio of the laser by adjusting the bias current of the laser;
the adjusting of the output extinction ratio of the laser by adjusting the bias current of the laser specifically comprises:
if it is
Figure FDA0003547230210000011
Then EX is set2＝EX1(ii) a Wherein p is1' indicates the laser plus bias current I after double closed loop controlbias2And modulating the current Imod2Optical power of p1Indicating laser plus bias current Ibias1And modulating the current Imod1Optical power of lower, EX2Representing said second extinction ratio, EX1Representing the first extinction ratio;
according to
Figure FDA0003547230210000012
Adjusting the average light power of the laser after the double closed-loop control; wherein, p'avgRepresenting the average optical power, p, of the laser after double closed-loop controlavgRepresents the average optical power of the laser;
the adjustment is controlled by a double closed loopBias current I of the latter laserbias2Of so that p'avgSatisfy the requirement of
Figure FDA0003547230210000013
Therefore, the output extinction ratio of the laser can be adjusted.
2. The method of claim 1, wherein said controlling the laser extinction ratio is based on
Figure FDA0003547230210000021
Before the average optical power of the laser after the double closed-loop control is adjusted, the method further includes:
is provided with p'avg＝50％pavgAs the minimum average optical power of the laser after double closed-loop control.
3. A method of controlling an extinction ratio of a laser according to claim 1, wherein the adjusting the output extinction ratio of the laser by adjusting a bias current of the laser further includes:
if it is
Figure FDA0003547230210000022
Then EX is set2＝EX0＝EXmin(ii) a Wherein, EX0Representing the preset extinction ratio; EXminRepresents the minimum value of the output extinction ratio;
according to
Figure FDA0003547230210000023
Adjusting the average light power of the laser after the double closed-loop control;
adjusting bias current I of laser controlled by double closed loopsbias2Of so that p'avgSatisfy the requirement of
Figure FDA0003547230210000024
Thereby realizing the output extinction ratio of the laserAnd (6) carrying out adjustment.
4. The laser extinction ratio control method of claim 3 wherein the control is based on
Figure FDA0003547230210000025
Before the average optical power of the laser after the double closed-loop control is adjusted, the method further includes:
if p'avg<50％pavgThe use temperature of the laser is lowered.
5. The method as claimed in any one of claims 1 to 4, wherein the adjusting of the bias current I of the laser after the double closed-loop controlbias2Before, still include:
if Ibias2<IthThe use temperature of the laser is lowered.
6. A laser extinction ratio control apparatus, comprising:
the acquisition module is used for acquiring a first extinction ratio of the laser and a second extinction ratio of the laser after double closed-loop control;
the comparison module is used for comparing the second extinction ratio with the first extinction ratio and a preset extinction ratio;
the adjusting module is used for adjusting the output extinction ratio of the laser according to the comparison result;
wherein, the adjusting module specifically comprises:
if the second extinction ratio is not smaller than the preset extinction ratio, the second extinction ratio is used as the output extinction ratio of the laser;
if the second extinction ratio is smaller than the preset extinction ratio, adjusting the output extinction ratio of the laser by adjusting the bias current of the laser;
the adjusting of the output extinction ratio of the laser by adjusting the bias current of the laser specifically comprises:
if it is
Figure FDA0003547230210000031
Then EX is set2＝EX1(ii) a Wherein p is1' denotes the laser plus bias current I after double closed-loop controlbias2And modulating the current Imod2Optical power of p1Indicating laser plus bias current Ibias1And modulating the current Imod1Optical power of lower, EX2Representing said second extinction ratio, EX1Representing the first extinction ratio;
according to
Figure FDA0003547230210000032
Adjusting the average light power of the laser after the double closed-loop control; wherein, p'avgRepresenting the average optical power, p, of the laser after double closed-loop controlavgRepresents the average optical power of the laser;
adjusting bias current I of laser controlled by double closed loopsbias2Of so that p'avgSatisfy the requirement of
Figure FDA0003547230210000033
Therefore, the output extinction ratio of the laser can be adjusted.
7. A terminal device comprising a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, the processor implementing the laser extinction ratio control method according to any one of claims 1 to 5 when executing the computer program.
8. A computer-readable storage medium, comprising a stored computer program, wherein the computer program, when executed, controls an apparatus in which the computer-readable storage medium is located to perform the method of controlling an extinction ratio of a laser according to any one of claims 1 to 5.
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