CN105680302A - Method and device for controlling light emission power of laser in optical module - Google Patents
Method and device for controlling light emission power of laser in optical module Download PDFInfo
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- CN105680302A CN105680302A CN201610194871.0A CN201610194871A CN105680302A CN 105680302 A CN105680302 A CN 105680302A CN 201610194871 A CN201610194871 A CN 201610194871A CN 105680302 A CN105680302 A CN 105680302A
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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
- 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
- H01S3/102—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling the active medium, e.g. by controlling the processes or apparatus for excitation
- H01S3/1028—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling the active medium, e.g. by controlling the processes or apparatus for excitation by controlling the temperature
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Abstract
The invention discloses a method and device for controlling the light emission power of a laser in an optical module. The method includes the following steps that: the environment temperature value of a current laser diode is obtained; if it is determined that the environment temperature value is greater than a first preset temperature value, a power attenuation value is determined according to the environment temperature value and the first preset temperature value, the power attenuation value is subtracted from a first digital-to-analog converter (DAC) value, so that a second DAC value can be obtained, wherein the first DAC value is a DAC value adopted by an automatic power control (APC) closed-loop circuit to control the light emission power of the laser diode when the environment temperature value is larger than a second preset temperature value and is smaller than or equal to the first preset temperature value; and the second DAC value is adopted as a DAC value adopted by the APC closed-loop circuit to control the light emission power of the laser diode.
Description
Technical field
The application relates to technical field of photo communication, particularly relates to control method and the device of laser apparatus luminous power in a kind of optical module.
Background technology
In optical communication technique, laser diode (LaserDiode, LD) is the major parts on optical module. When laser diode works, along with the change of temperature, the luminous power of laser diode also can constantly change, thus affects the optical transmission performance of optical module. Concrete, if desired laser diode is within the scope of differing temps, and the average luminescence power of output is identical, and the temperature of laser diode work is more high, and the characteristic Slop efficiency of laser diode is more little, and required bias current is more big, and modulating current is also more big.
When laser diode is operated in normal temperature range, the luminous power of laser diode can increase along with the increase of bias current. therefore, control chip in optical module can be determined at different temperatures, the luminous power of laser diode is maintained bias current (biascurrent) required in the performance number pre-set, such that it is able to by adjustment automated power control (automaticpowercontrol, APC) DAC (Digital-to-AnalogConverter of closed loop circuit, digital to analog converter) DAC value in register, the bias current of laser diode is made to be that the luminous power of laser diode maintains bias current required in the performance number pre-set, it is thus possible at different temperatures, the luminous power of laser diode is maintained the performance number pre-set.
But, along with the increase of temperature, when laser diode works at high operating temperatures, the luminous power of laser diode can't increase along with the increase of bias current, but is tending towards state of saturation. After temperature variation causes the luminous power of laser diode to be in state of saturation, APC closed loop circuit can not increase the luminous power of laser diode by increasing the mode of bias current. The luminous power of laser diode does not increase APC closed loop circuit can be made on the contrary to continue to increase bias current, thus causes bias current too high, and laser diode stops luminous.
Summary of the invention
The embodiment of the present application provides control method and the device of laser apparatus luminous power in a kind of optical module, sharply changes or under hot conditions, APC closed loop circuit is difficult to the problem of the luminous power of stabilized lasers diode for solving temperature in prior art.
The embodiment of the present application provides the control method of laser apparatus luminous power in a kind of optical module, comprising:
Obtain the ambient temperature value of current laser diode;
If determining, described ambient temperature value is greater than the first preset temperature value, then determine power attenuation value according to described ambient temperature value and described first preset temperature value, and the first digital to analog converter DAC value is subtracted described power attenuation value, obtains the 2nd DAC value; Described first DAC value is described ambient temperature value when being greater than the 2nd preset temperature value and be less than or equal described first preset temperature value, the DAC value that the luminous power of laser diode described in automated power control APC closed loop control circui adopts;
Using the DAC value that described 2nd DAC value adopts as the luminous power of laser diode described in described APC closed loop control circui.
The embodiment of the present application provides the control device of laser apparatus luminous power in a kind of optical module, and this device comprises:
Acquiring unit, for obtaining the ambient temperature value of current laser diode;
Processing unit, if for determining that described ambient temperature value is greater than the first preset temperature value, then determine power attenuation value according to described ambient temperature value and described first preset temperature value, and the first digital to analog converter DAC value is subtracted described power attenuation value, obtain the 2nd DAC value; Described first DAC value is described ambient temperature value when being greater than the 2nd preset temperature value and be less than or equal described first preset temperature value, the DAC value that the luminous power of laser diode described in automated power control APC closed loop control circui adopts;
Control unit, for the DAC value adopted as the luminous power of laser diode described in described APC closed loop control circui by described 2nd DAC value.
According to the method that the embodiment of the present application provides, after determining that the ambient temperature value of current laser diode is greater than the first preset temperature value, according to described ambient temperature value and described first preset temperature value, the first DAC value decayed to the 2nd DAC value, then the DAC value described 2nd DAC value adopted as the luminous power of laser diode described in described APC closed loop control circui so that luminous power value when laser diode works reduces. Due in the embodiment of the present application, when ambient temperature value is greater than the 2nd preset temperature value and is less than or equals described first preset temperature value, the luminous power of described laser diode is the luminous power value corresponding to the first DAC value, thus ensures that laser diode works according to preset emission performance number when certain temperature. Simultaneously, after ambient temperature value is greater than the first preset temperature value, reduce the first DAC value, obtain the 2nd DAC value, thus reduce luminous power value when laser diode works, thus the luminous power that the laser diode that causes when avoiding ambient temperature value to be greater than the first preset temperature value occurs is saturated, causes APC closed loop circuit constantly to increase the bias current of laser diode so that laser diode due to bias current too high and stop luminous problem.
Accompanying drawing explanation
In order to the technical scheme being illustrated more clearly in the embodiment of the present application, below the accompanying drawing used required in embodiment being described is briefly introduced, apparently, accompanying drawing in the following describes is only some embodiments of the application, for the those of ordinary skill of this area, under the prerequisite not paying creative work, it is also possible to obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the rational curve schematic diagram of luminous power along with curent change of laser diode under differing temps;
The control method schematic flow sheet of laser apparatus luminous power in a kind of optical module that Fig. 2 provides for the embodiment of the present application;
The control method flow diagram of laser apparatus luminous power in a kind of optical module that Fig. 3 provides for the embodiment of the present application;
The control device structural representation of laser apparatus luminous power in a kind of optical module that Fig. 4 provides for the embodiment of the present application.
Embodiment
In order to make the object of the application, technical scheme and advantage clearly, below in conjunction with accompanying drawing, the application is described in further detail, it is clear that described embodiment is only a part of embodiment of the application, instead of whole embodiments. Based on the embodiment in the application, those of ordinary skill in the art are not making other embodiments all obtained under creative work prerequisite, all belong to the scope of the application's protection.
As shown in Figure 1, for, in prior art, under differing temps, the luminous power of laser diode is along with the rational curve schematic diagram of curent change. In Fig. 1, X-coordinate is electric current, and ordinate zou is luminous power. Curve 101 is laser diode is rational curve during T1 in temperature, and curve 102 is laser diode is rational curve during T2 (T1 is less than T2) in temperature. Wherein, PAVGFor the average luminescence power of laser diode, PAVG=(P0+P1)/2, wherein, P0For laser diode send numerary signal " 0 " time luminous power, P1For laser diode send numerary signal " 1 " time luminous power. By the curve in Fig. 1 it will be seen that when laser diode is operated in normal temperature range, the luminous power of laser diode can increase along with the increase of bias current. But, along with the increase of temperature, when laser diode works at high operating temperatures, the luminous power of laser diode can't increase along with the increase of bias current, but is tending towards state of saturation.
Therefore, when the luminous power of laser diode is tending towards state of saturation, how to make laser diode normal operation, also there is no clear and definite solution at present.
Based on above description, as shown in Figure 2, for the embodiment of the present application provides the control method schematic flow sheet of laser apparatus luminous power in a kind of optical module, comprising:
Step 201: the ambient temperature value obtaining current laser diode;
Step 202: described ambient temperature value is greater than the first preset temperature value if determining, then determine power attenuation value according to described ambient temperature value and described first preset temperature value, and the first digital to analog converter DAC value is subtracted described power attenuation value, obtain the 2nd DAC value; Described first DAC value is described ambient temperature value when being greater than the 2nd preset temperature value and be less than or equal described first preset temperature value, the DAC value that the luminous power of laser diode described in automated power control APC closed loop control circui adopts;
Step 203: the DAC value that described 2nd DAC value is adopted as the luminous power of laser diode described in described APC closed loop control circui.
In step 201, envrionment temperature can be obtained by multiple method, such as, the temperature of chip can be currently controlled by being arranged in the temperature sensor measurement of the control chip of optical module, then by the control temperature that obtains of chip reading temperature sensor measurement, and it is the ambient temperature value of laser diode work at present by the temperature conversion read.Again such as, it is also possible to directly obtain the ambient temperature value of laser diode work at present by being positioned over the temperature sensor of laser diode annex.
In step 202, by description above it will be seen that at a normal temperature, being generally between-40 DEG C to 80 DEG C, along with the increase of temperature, laser diode is being operated under identical luminous power, it is necessary to bias current also more big. Therefore, when the temperature of laser diode work sends change, in order to obtain stable luminous power, it is necessary to bias current is controlled. The bias current of laser diode is by APC closed loop control circui. APC closed loop circuit has various ways, and this is not limited by the embodiment of the present application.
For example, it is possible to a kind of APC closed loop circuit provided in the application documents that application reference number is 200710107632.8.
In the embodiment of the present application, APC closed loop circuit is the luminous power of laser diode can be made to remain on the circuit on the luminous power corresponding to this controling parameters under given controling parameters controls. When changing this controling parameters, by changing, bias current makes photodiode obtain a stable luminous power corresponding with this controling parameters at different temperatures to APC closed loop circuit. Meanwhile, controling parameters and luminous power are proportionate relation, and namely controling parameters is more big, and the luminous power that controling parameters is corresponding is more big. For convenience, this controling parameters is called DAC value below.
Whenever specifying a DAC value for APC closed loop circuit, APC closed loop circuit just can control the stable output of the laser diode luminous power corresponding with this DAC value. For example, in APC closed loop circuit, the corresponding relation of the luminous power of DAC value and laser diode can be P=log (BDAC× K), wherein, P is the luminous power of laser diode; K is known constant, it is possible to determine according to the APC closed loop circuit of reality; BDACFor needing the DAC value arranged. Owing to there is above-mentioned corresponding relation, such that it is able to luminous power as required, for APC closed loop circuit arranges corresponding DAC value.
Certainly, being more than example, the corresponding relation of the luminous power of DAC value and laser diode can also be other forms, does not repeat them here.
In the embodiment of the present application, when determining that described ambient temperature value is greater than the 2nd preset temperature value and is less than or equals described first preset temperature value, the luminous power of laser diode is stabilized in the luminous power corresponding with the first DAC value by APC closed loop circuit. Wherein, the 2nd preset temperature value is less than the first preset temperature value.
When determining that described ambient temperature value is greater than described first preset temperature value, in order to avoid the working temperature of laser diode too high, laser diode is caused to be operated in state of saturation, it is possible to be reduced by the luminous power of laser diode.
Concrete, when determining that described ambient temperature value is greater than described first preset temperature value, first determine described ambient temperature value and the difference of described first preset temperature value; Then preset adjusted value by first and it is multiplied by described difference, obtain described power attenuation value; Finally the first DAC value is subtracted described power attenuation value, obtains the 2nd DAC value. Wherein, first preset adjusted value be greater than 0 number.
For example, when envrionment temperature is between-40 DEG C to 80 DEG C, the luminous power of laser diode is controlled at luminous power corresponding to the first DAC value by APC closed loop circuit. First default adjusted value is a, a is preset value, it is possible to be 0.025 equivalence.When envrionment temperature is more than 80 DEG C, temperature was once often rising, and DAC value can reduce a.
Certainly, being more than example, first presets adjusted value can also other forms, does not repeat them here.
Optionally, in the embodiment of the present application, before determining power attenuation value according to described ambient temperature value and described first preset temperature value, it is also possible to judge whether the current bias current value of described laser diode is less than default bias current value; If the current bias current value of described laser diode is less than default bias current value, then directly the first DAC value is subtracted the power attenuation value determined, obtain the 2nd DAC value; If the current bias current value of described laser diode is more than or equal to default bias current value, then first determine power attenuation value according to described ambient temperature value and described first preset temperature value; Then described first DAC value is subtracted described power attenuation value; Finally the first DAC value after subtracting described power attenuation value is multiplied by the first reduction coefficient, obtains described 2nd DAC value; Described first reduction coefficient is greater than 0 and be less than 1.
It should be noted that, default bias current value can be the arbitrary value between 45mA to 50mA. First reduction coefficient can be determined according to practical situation, such as, it is possible to value is 0.7. Certainly, it is more than example, specifically can determine according to practical situation, not repeat them here.
Finally, in step 203, by the first DAC value in APC closed loop circuit is revised as the 2nd DAC value, so that the luminous power of laser diode is again adjusted by APC closed loop circuit according to the 2nd DAC value obtained.
Owing to the first DAC value is greater than the 2nd DAC value, therefore the first DAC value for luminous power be greater than the 2nd DAC value luminous power so that laser diode is at high temperature, luminous power during work reduces, thus avoids laser diode to be operated in saturation region.
Laser diode operationally, except being ensured that luminous power is stable, in addition it is also necessary to ensure the stable of extinction ratio, if extinction ratio is unstable, the error rate can be caused to rise, thus affect transfer. Extinction ratio refers to the luminous power P of laser diode when sending numerary signal " 1 "1With laser diode send numerary signal " 0 " time luminous power P0Ratio, i.e. ER=P1/P0, wherein, ER is extinction ratio.
The total current of laser diode is made up of two parts: bias current and modulating current (modulationcurrent). Composition graphs 1, the luminous power P of laser diode when sending numerary signal " 0 "0Determine primarily of bias current, the luminous power P of laser diode when sending numerary signal " 1 "1Determine primarily of modulating current.
Therefore, in conjunction with description above, using described 2nd DAC value as after the DAC value that the luminous power of laser diode described in described APC closed loop control circui adopts, it is also possible to the modulating current of laser diode is regulated.
In the embodiment of the present application, it is possible to by the modulating current of laser diode described in control modulating current control chip, by inputting, in the MOD register of modulating current control chip, the DAC value specified, so that it may to obtain the modulating current corresponding to this DAC value. Modulating current control chip can have multiple, and this is not limited by the embodiment of the present application.
For example, modulating current control chip can be the MAX3948 series chip of the U.S. heart (maxin) company, and now the relation of the DAC value in the MOD register of modulating current and modulating current control chip can be following form:
MODDAC=4.05 × IMOD-3.925…………………………(1)
Wherein, MODDACFor the DAC value in the MOD register of modulating current control chip, IMODFor modulating current.
Again for example, modulating current control chip can be the GN1157 series chip of Semtech company, and now the relation of the DAC value in the MOD register of modulating current and modulating current control chip can be following form:
Wherein, MODDACFor the DAC value in the MOD register of modulating current control chip, IMODFor modulating current, R is the loaded impedance of laser diode.
Certainly, modulating current control chip can also be other chips, specifically can determine according to practical situation, not repeat them here.
It should be noted that, DAC value and modulating current in the MOD register of modulating current control chip are proportionate, and namely the DAC value in the MOD register of modulating current control chip is more big, and corresponding modulating current is more big.
When being controlled by modulating current, it is possible to determine required modulating current according to current envrionment temperature, such that it is able to control to modulating current the MOD register of chip writes corresponding DAC value, thus realize control modulating current. The corresponding relation of modulating current and temperature can be stored in advance in modulating current control chip, thus realizes controlling modulating current in real time.
In conjunction with description above, after ambient temperature value is greater than the first preset temperature value, it is possible to control modulating current in the following ways:
Step one, determine current damping value according to described ambient temperature value and described first preset temperature value.
Concrete, it is possible to first determine described ambient temperature value and the difference of described first preset temperature value; Then preset adjusted value by the 2nd and it is multiplied by described difference, thus obtain described current damping value. Wherein, the 2nd preset adjusted value be greater than 0 number.
For example, the 2nd default adjusted value is b, b can be 0.05 equivalence. When envrionment temperature is more than 80 DEG C, temperature was once often rising, and the DAC value in the MOD register of modulating current control chip can reduce b.
Certainly, being more than example, the 2nd presets adjusted value can also other forms, does not repeat them here.
Step 2, the 3rd DAC value is subtracted described current damping value, obtain the 4th DAC value; Described 3rd DAC value is under described ambient temperature value, the DAC value that the modulating current of laser diode described in modulating current control chip controls adopts.
Step 3, the DAC value that described 4th DAC value is adopted as the modulating current of laser diode described in described modulating current control chip controls.
Optionally, in said process, before step 2, it is also possible to judge whether the current bias current value of described laser diode is less than default bias current value; If the current bias current value of described laser diode is less than default bias current value, then first determine current damping value according to described ambient temperature value and described first preset temperature value; Then the 3rd DAC value is subtracted described current damping value; Finally the 3rd DAC value after subtracting described current damping value is multiplied by the 2nd reduction coefficient, obtains the 4th DAC value; Described 2nd reduction coefficient is greater than 0 and be less than 1.
It should be noted that, the 2nd reduction coefficient can be determined according to practical situation, such as, it is possible to value is 0.6. Certainly, it is more than example, specifically can determine according to practical situation, not repeat them here.
Below in conjunction with embodiment, process above is described in detail.
As shown in Figure 3, a kind of laser diode luminous power provided for the embodiment of the present application controls method flow diagram.
See Fig. 3, the method comprises:
Step 301: the ambient temperature value obtaining current laser diode.
The method of the ambient temperature value obtaining current laser diode can have multiple, it is possible to the description in refer step 201, it is also possible to reference to method of the prior art, does not repeat them here.
Step 302: judge whether described ambient temperature value is greater than the first preset temperature value, if not, then goes to step 303, otherwise goes to step 304.
Step 303: luminous power and the modulating current controlling laser diode according to existing scheme.
Step 304: judge whether the current bias current value of described laser diode is less than default bias current value, if then going to step 305, otherwise going to step 306.
Step 305: determine the 2nd DAC value and the 4th DAC value according to mode one.
Concrete, first determine power attenuation value according to described ambient temperature value and described first preset temperature value; Then described first DAC value is subtracted described power attenuation value; Finally the first DAC value after subtracting described power attenuation value is multiplied by the first reduction coefficient, obtains described 2nd DAC value.
Current damping value is determined according to described ambient temperature value and described first preset temperature value; Then the 3rd DAC value is subtracted described current damping value; Finally the 3rd DAC value after subtracting described current damping value is multiplied by the 2nd reduction coefficient, obtains the 4th DAC value.
Step 306: determine the 2nd DAC value and the 4th DAC value according to mode two.
Concrete, it is determined that the difference of described ambient temperature value and described first preset temperature value; Then preset adjusted value by first and it is multiplied by described difference, obtain described power attenuation value; Finally the first DAC value is subtracted described power attenuation value, obtains the 2nd DAC value.
Current damping value is determined according to described ambient temperature value and described first preset temperature value; 3rd DAC value is subtracted described current damping value, obtains the 4th DAC value.
Based on identical technical conceive, the embodiment of the present application also provides the control device of laser apparatus luminous power in a kind of optical module, and this device can perform aforesaid method embodiment.
As shown in Figure 4, for the embodiment of the present application provides the control device structural representation of laser apparatus luminous power in a kind of optical module.
This device can perform the flow process shown in Fig. 4, and this device comprises:
Acquiring unit 401, for obtaining the ambient temperature value of current laser diode;
Processing unit 402, if for determining that described ambient temperature value is greater than the first preset temperature value, then determine power attenuation value according to described ambient temperature value and described first preset temperature value, and the first digital to analog converter DAC value is subtracted described power attenuation value, obtain the 2nd DAC value; Described first DAC value is described ambient temperature value when being greater than the 2nd preset temperature value and be less than or equal described first preset temperature value, the DAC value that the luminous power of laser diode described in automated power control APC closed loop control circui adopts;
Control unit 403, for the DAC value adopted as the luminous power of laser diode described in described APC closed loop control circui by described 2nd DAC value.
Optionally, described processing unit 402 specifically for:
Determine described ambient temperature value and the difference of described first preset temperature value;
Preset adjusted value by first and it is multiplied by described difference, obtain described power attenuation value.
Optionally, described processing unit 402 also for:
Current damping value is determined according to described ambient temperature value and described first preset temperature value;
3rd DAC value is subtracted described current damping value, obtains the 4th DAC value;Described 3rd DAC value is under described ambient temperature value, controls the DAC value that the modulating current of described laser diode adopts;
Using the DAC value that described 4th DAC value adopts as the modulating current of laser diode described in described modulating current control chip controls.
Optionally, described processing unit 402 specifically for:
Determine described ambient temperature value and the difference of described first preset temperature value;
Preset adjusted value by the 2nd and it is multiplied by described difference, obtain described current damping value.
Optionally, before determining power attenuation value according to described ambient temperature value and described first preset temperature value, described processing unit also for:
Determine that the current bias current value of described laser diode is less than default bias current value.
Optionally, described processing unit 402 specifically for:
If determining, described ambient temperature value is greater than the first preset temperature value, and determines that the current bias current value of described laser diode is more than or equal to default bias current value, then determine power attenuation value according to described ambient temperature value and described first preset temperature value;
Described first DAC value is subtracted described power attenuation value, and the first DAC value after subtracting described power attenuation value is multiplied by the first reduction coefficient, obtain described 2nd DAC value; Described first reduction coefficient is greater than 0 and be less than 1.
Optionally, described the first DAC value after subtracting described power attenuation value is multiplied by the first reduction coefficient after, described processing unit 402 also for:
Current damping value is determined according to described ambient temperature value and described first preset temperature value;
3rd DAC value is subtracted described current damping value, and the 3rd DAC value after subtracting described current damping value is multiplied by the 2nd reduction coefficient, obtain the 4th DAC value; Described 3rd DAC value is under described ambient temperature value, the DAC value that the modulating current of laser diode described in modulating current control chip controls adopts;
Using the DAC value that described 4th DAC value adopts as the modulating current of laser diode described in described modulating current control chip controls.
The application is that schema and/or skeleton diagram with reference to the method according to the embodiment of the present application, equipment (system) and computer program describe. Should understand can by the combination of the flow process in each flow process in computer program instructions flowchart and/or skeleton diagram and/or square frame and schema and/or skeleton diagram and/or square frame. These computer program instructions can be provided to the treater of multi-purpose computer, special purpose computer, Embedded Processor or other programmable data processing device to produce a machine so that the instruction performed by the treater of computer or other programmable data processing device is produced for realizing the device of function specified in schema flow process or multiple flow process and/or skeleton diagram square frame or multiple square frame.
These computer program instructions also can be stored in and can guide in computer-readable memory that computer or other programmable data processing device work in a specific way, making the instruction that is stored in this computer-readable memory produce the manufacture comprising instruction device, this instruction device realizes the function specified in schema flow process or multiple flow process and/or skeleton diagram square frame or multiple square frame.
These computer program instructions also can be loaded in computer or other programmable data processing device, make on computer or other programmable devices, to perform a series of operation steps to produce computer implemented process, thus the instruction performed on computer or other programmable devices is provided for realizing the step of the function specified in schema flow process or multiple flow process and/or skeleton diagram square frame or multiple square frame.
Although having described the preferred embodiment of the application, but those skilled in the art once the substantially creative concept of cicada, then these embodiments can be made other change and amendment. Therefore, it is intended that the appended claims shall be construed comprise preferred embodiment and fall into all changes and the amendment of the application's scope.
Obviously, the application can be carried out various change and modification and not depart from the scope of the application by the technician of this area. Like this, if these amendments of the application and modification belong within the scope of the application's claim, then the application also is intended to comprise these change and modification.
Claims (14)
1. the control method of laser apparatus luminous power in an optical module, it is characterised in that, the method comprises:
Obtain the ambient temperature value of current laser diode;
If determining, described ambient temperature value is greater than the first preset temperature value, then determine power attenuation value according to described ambient temperature value and described first preset temperature value, and the first digital to analog converter DAC value is subtracted described power attenuation value, obtains the 2nd DAC value; Described first DAC value is described ambient temperature value when being greater than the 2nd preset temperature value and be less than or equal described first preset temperature value, the DAC value that the luminous power of laser diode described in automated power control APC closed loop control circui adopts;
Using the DAC value that described 2nd DAC value adopts as the luminous power of laser diode described in described APC closed loop control circui.
2. the method for claim 1, it is characterised in that, described determine power attenuation value according to described ambient temperature value and described first preset temperature value, comprising:
Determine described ambient temperature value and the difference of described first preset temperature value;
Preset adjusted value by first and it is multiplied by described difference, obtain described power attenuation value.
3. the method for claim 1, it is characterised in that, described using described 2nd DAC value as after the DAC value that the luminous power of laser diode described in described APC closed loop control circui adopts, also comprising:
Current damping value is determined according to described ambient temperature value and described first preset temperature value;
3rd DAC value is subtracted described current damping value, obtains the 4th DAC value; Described 3rd DAC value is under described ambient temperature value, the DAC value that the modulating current of laser diode described in modulating current control chip controls adopts;
Using the DAC value that described 4th DAC value adopts as the modulating current of laser diode described in described modulating current control chip controls.
4. method as claimed in claim 3, it is characterised in that, described determine current damping value according to described ambient temperature value and described first preset temperature value, comprising:
Determine described ambient temperature value and the difference of described first preset temperature value;
Preset adjusted value by the 2nd and it is multiplied by described difference, obtain described current damping value.
5. the method for claim 1, it is characterised in that, before determining power attenuation value according to described ambient temperature value and described first preset temperature value, also comprise:
Determine that the current bias current value of described laser diode is less than default bias current value.
6. the method for claim 1, it is characterized in that, if determining, described ambient temperature value is greater than the first preset temperature value, then determine power attenuation value according to described ambient temperature value and described first preset temperature value, and the first digital to analog converter DAC value is subtracted described power attenuation value, obtain the 2nd DAC value, comprising:
If determining, described ambient temperature value is greater than the first preset temperature value, and determines that the current bias current value of described laser diode is more than or equal to default bias current value, then determine power attenuation value according to described ambient temperature value and described first preset temperature value;
Described first DAC value is subtracted described power attenuation value, and the first DAC value after subtracting described power attenuation value is multiplied by the first reduction coefficient, obtain described 2nd DAC value; Described first reduction coefficient is greater than 0 and be less than 1.
7. method as claimed in claim 6, it is characterised in that, described the first DAC value after subtracting described power attenuation value is multiplied by the first reduction coefficient after, also comprise:
Current damping value is determined according to described ambient temperature value and described first preset temperature value;
3rd DAC value is subtracted described current damping value, and the 3rd DAC value after subtracting described current damping value is multiplied by the 2nd reduction coefficient, obtain the 4th DAC value; Described 3rd DAC value is under described ambient temperature value, the DAC value that the modulating current of laser diode described in modulating current control chip controls adopts; Described 2nd reduction coefficient is greater than 0 and be less than 1;
Using the DAC value that described 4th DAC value adopts as the modulating current of laser diode described in described modulating current control chip controls.
8. the control device of laser apparatus luminous power in an optical module, it is characterised in that, this device comprises:
Acquiring unit, for obtaining the ambient temperature value of current laser diode;
Processing unit, if for determining that described ambient temperature value is greater than the first preset temperature value, then determine power attenuation value according to described ambient temperature value and described first preset temperature value, and the first digital to analog converter DAC value is subtracted described power attenuation value, obtain the 2nd DAC value; Described first DAC value is described ambient temperature value when being greater than the 2nd preset temperature value and be less than or equal described first preset temperature value, the DAC value that the luminous power of laser diode described in automated power control APC closed loop control circui adopts;
Control unit, for the DAC value adopted as the luminous power of laser diode described in described APC closed loop control circui by described 2nd DAC value.
9. device as claimed in claim 8, it is characterised in that, described processing unit specifically for:
Determine described ambient temperature value and the difference of described first preset temperature value;
Preset adjusted value by first and it is multiplied by described difference, obtain described power attenuation value.
10. device as claimed in claim 8, it is characterised in that, described processing unit also for:
Current damping value is determined according to described ambient temperature value and described first preset temperature value;
3rd DAC value is subtracted described current damping value, obtains the 4th DAC value; Described 3rd DAC value is under described ambient temperature value, controls the DAC value that the modulating current of described laser diode adopts;
Using the DAC value that described 4th DAC value adopts as the modulating current of laser diode described in described modulating current control chip controls.
11. devices as claimed in claim 10, it is characterised in that, described processing unit specifically for:
Determine described ambient temperature value and the difference of described first preset temperature value;
Preset adjusted value by the 2nd and it is multiplied by described difference, obtain described current damping value.
12. devices as claimed in claim 8, it is characterised in that, before determining power attenuation value according to described ambient temperature value and described first preset temperature value, described processing unit also for:
Determine that the current bias current value of described laser diode is less than default bias current value.
13. devices as claimed in claim 8, it is characterised in that, described processing unit specifically for:
If determining, described ambient temperature value is greater than the first preset temperature value, and determines that the current bias current value of described laser diode is more than or equal to default bias current value, then determine power attenuation value according to described ambient temperature value and described first preset temperature value;
Described first DAC value is subtracted described power attenuation value, and the first DAC value after subtracting described power attenuation value is multiplied by the first reduction coefficient, obtain described 2nd DAC value; Described first reduction coefficient is greater than 0 and be less than 1.
14. devices as claimed in claim 13, it is characterised in that, described the first DAC value after subtracting described power attenuation value is multiplied by the first reduction coefficient after, described processing unit also for:
Current damping value is determined according to described ambient temperature value and described first preset temperature value;
3rd DAC value is subtracted described current damping value, and the 3rd DAC value after subtracting described current damping value is multiplied by the 2nd reduction coefficient, obtain the 4th DAC value; Described 3rd DAC value is under described ambient temperature value, the DAC value that the modulating current of laser diode described in modulating current control chip controls adopts; Described 2nd reduction coefficient is greater than 0 and be less than 1;
Using the DAC value that described 4th DAC value adopts as the modulating current of laser diode described in described modulating current control chip controls.
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| CN201610194871.0A CN105680302A (en) | 2016-03-30 | 2016-03-30 | Method and device for controlling light emission power of laser in optical module |
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| CN201610194871.0A CN105680302A (en) | 2016-03-30 | 2016-03-30 | Method and device for controlling light emission power of laser in optical module |
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