CN104597810A - Output light power stability control method of optical module - Google Patents
Output light power stability control method of optical module Download PDFInfo
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- CN104597810A CN104597810A CN201410768258.6A CN201410768258A CN104597810A CN 104597810 A CN104597810 A CN 104597810A CN 201410768258 A CN201410768258 A CN 201410768258A CN 104597810 A CN104597810 A CN 104597810A
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
- G05B19/0423—Input/output
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/20—Pc systems
- G05B2219/25—Pc structure of the system
- G05B2219/25314—Modular structure, modules
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Abstract
The invention discloses an output light power stability control method of an optical module. The output light power stability control method comprises the steps that 1 a backlight diode acquires output light of the optical module and converts the output light into a current value forming positive correlation change with the power of the output light; 2 the current value is converted into a current digital value through an analog-digital converter in a microcontroller in the optical module; 3 the current digital value is calculated and compared with a current digital standard value corresponding to the power of the output light of the preset light module to obtain the current difference value of the two parties; 4 the current difference value is compared with a first range threshold value representing the power fluctuation of the output light, it is determined that the power of the output light is stable if the current difference value is within the first range threshold value, the power of the output light of the optical module is adjusted through the microcontroller if the current difference value is not within the first range threshold value till the current difference value is within the first range threshold value. The output light power stability control method has the advantages of being capable of improving the light output stability of the optical module.
Description
Technical field
The present invention relates to a kind of control method for Output optical power stability.More particularly, the present invention relates to a kind of Output optical power stability control method for optical module.
Background technology
Optical module is a kind of for providing the integrated communication accessory of photoelectricity-electro-optic conversion ability, is usually made up of two parts: radiating portion and receiving unit.The major function of radiating portion converts electrical signals to light signal.In order to ensure the stable of radiating portion Output optical power and performance, the photocurrent produced by detecting backlight diode (MD) is needed to realize closed-loop control.APC and automated power control, and are the necessary means realizing this function.
Fig. 1 is the APC circuit that mimic channel is built, circuit theory is the photocurrent detected according to backlight diode (MD), regulate the bias current (BIAS) be applied on laser diode (LD), realize negative feedback, keep Output optical power to stablize.But the APC circuit that mimic channel is built, poor controllability, regulation time is slow, and application is confined to the conventional modules of 100,000,000 and gigabit speed, cannot meet the objective demand of higher rate and market customization.On the laser instrument of some MD bandwidth deficiency, simulation APC circuit is subject to great restriction.
Along with the progress of semicon industry, the APC circuit of digital program controlled formula instead of original simulation APC circuit gradually.The principle of numeral APC circuit, namely by analog to digital converter, the photocurrent that backlight diode (MD) detects is sampled, again according to the requirement of application, regulated the bias current (BIAS) be applied on laser diode (LD) by digital to analog converter, keep Output optical power to stablize.The advantage of which is that controllability is strong, and governing speed is fast, does not limit by MD bandwidth, compatible good to laser instrument.
But in digital manipulation, digital APC function may be subject to the environmental impacts such as noise, the judgement made the mistake and setting.This just has higher requirement to digital algorithm.
Summary of the invention
An object of the present invention is to solve at least the problems referred to above, and the advantage will illustrated at least is below provided.
A further object of the invention is to provide a kind of Output optical power stability control method of optical module, and it can improve the poor controllability of simulation APC circuit, and regulation time is slow, by the problem of MD bandwidth restriction.
A further object of the invention is the Output optical power stability control method by a kind of optical module, while the digitized advantage of succession, the algorithms of different of different threshold region is dropped on by current differential, problems such as improving the erroneous judgement of conventional numerical APC circuit, be easily disturbed, alignment error is large, to ensure high stability.
In order to realize, according to these objects of the present invention and other advantages, providing a kind of Output optical power stability control method of optical module, comprising:
Step one, backlight diode gather the output light of optical module, are converted into the current value becoming positive correlation to change with the power exporting light;
Step 2, by the analog to digital converter in the microcontroller in optical module, current value is converted to current digital value;
Step 3, calculate this current digital value and compare with the current digital standard value corresponding to Output optical power of optical module preset, obtain both current differential;
Step 4, the first range threshold that current differential and representative export the power swing of light to be compared, if fall in this first range threshold, then judge that Output optical power is stablized, if exceed this first range threshold, then regulated the Output optical power of described optical module by described microcontroller, until this current differential falls in this first range threshold.
Preferably, wherein, in described step 3, the method for the Output optical power of described optical module is regulated to be by described microcontroller: the size regulating the bias current on laser diode, finally to change the Output optical power of optical module.
Preferably, wherein, in described step 3, also comprise the second range threshold that representative exports the power swing of light, described second range threshold is greater than described first range threshold, if current differential exceeds this first range threshold, but do not exceed this second range threshold, then described microcontroller is with the size waiting the mode entered to regulate described bias current step by step.
Preferably, wherein, if current differential exceeds this first range threshold, and this second range threshold is also exceeded, then described microcontroller regulates the size of described bias current in the mode of regressive, namely regulates the size of described bias current in the mode that stepping is more and more less.
Preferably, wherein, described first range threshold is [-4lbs ,+4lbs].
Preferably, wherein, described second range threshold is [-8lbs ,+8lbs].
The present invention at least comprises following beneficial effect:
1, because the present invention adopts digitizing APC circuit control method, solve the restriction of traditional simulation APC circuit for backlight diode bandwidth, can the backlight diode of compatible any bandwidth, the restriction of backlight diode bandwidth can not be limited to as simulation APC circuit, substantially increase the compatibility for laser instrument.
2, because core algorithm of the present invention combines hysteresis formula algorithm, step algorithm and proportion expression algorithm, therefore, it is possible to ensure the control of the Output optical power of optical module more quick, stable.
3, the code that the present invention is ease in use and rigorous program structure, be conveniently transplanted to any microprocessor platform, substantially reduce the construction cycle, reduces the cost overhead of the updating and upgrading of a product.
Part is embodied by explanation below by other advantage of the present invention, target and feature, part also will by research and practice of the present invention by those skilled in the art is understood.
Accompanying drawing explanation
Fig. 1 be the simulation APC circuit of prior art realize schematic diagram;
Fig. 2 is groundwork schematic flow sheet of the present invention;
Fig. 3 is the schematic flow sheet of core algorithm of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in further detail, can implement according to this with reference to instructions word to make those skilled in the art.
Fig. 2 shows groundwork schematic flow sheet of the present invention, shows the main flow of this patent.Comprising: start-to MD current sample-analytical sampling value and desired value difference-carry out algorithm process-arrange bias current-complete.Wherein, the desired value in Fig. 2 is the current digital standard value corresponding to Output optical power of default optical module, and algorithm process link is the core of this patent.
Fig. 3 shows flow process and the details of core algorithm of the present invention, and wherein, hysteresis interval is the first range threshold, and stepping interval is and exceeds the first range threshold but be no more than the second range threshold.
The Output optical power stability control method of optical module of the present invention, comprising:
The energising of step one, optical module is opened, and backlight diode gathers the output light of optical module, is converted into the current value becoming positive correlation to change with the power exporting light;
Step 2, by the analog to digital converter in the microcontroller in optical module, current value is converted to current digital value;
Step 3, calculate this current digital value and compare with the current digital standard value corresponding to Output optical power of optical module preset, obtain both current differential;
Step 4, the first range threshold that current differential and representative export the power swing of light to be compared, if fall in this first range threshold, then judge that Output optical power is stablized, if exceed this first range threshold, then regulated the Output optical power of described optical module by described microcontroller, until this current differential falls in this first range threshold.In step one, after optical module energising, laser diode is luminous, the induction generation that backlight diode is subject to laser diode becomes positive correlation to change current value with Output optical power, is that the light intensity being difficult to regulate and control is converted into strength of current here, is convenient to monitoring; Analog quantity is converted into digital value by the analog to digital converter in step 2, is convenient to subsequent calculations; The different of difference after step 3 compares according to current flow digital value and digital standard value from step 4 select different modes to regulate by microcontroller, as shown in Figure 3, if current differential is in hysteresis interval, then light is not exported to optical module and adjust; If current differential is in outside hysteresis interval, then make current differential be positioned at hysteresis interval by different adjustment modes, the adjustment fast and stable more of Output optical power can be ensured like this.
Hysteresis interval (the first range threshold), namely difference value needs to be greater than the interval upper limit or to be less than interval limit just to adjust, if sampled value is beated in interval, then thinks normal noise.This can effectively be avoided adjusting the maloperation caused with noise frequently, is the advanced basketball skills ensureing correctness and speed.
In described step 3, the method for the Output optical power of described optical module is regulated to be by described microcontroller: the size regulating the bias current on laser diode, finally to change the Output optical power of optical module.Regulated the size of the bias current on laser diode by the digital to analog converter inside microcontroller, thus change the Output optical power of optical module.
In described step 3, also comprise the second range threshold that representative exports the power swing of light, described second range threshold is greater than described first range threshold, if current differential exceeds this first range threshold, but do not exceed this second range threshold, namely current differential is in the stepping interval in Fig. 3, then described microcontroller is with the size waiting the mode entered to regulate described bias current step by step.In Fig. 3, two places are carried out to current differential and has judged, be first judge this difference whether in hysteresis interval, if be in interval, then bias current do not regulated; If be in outside interval, then carry out second time and judge.Second time judges, discusses, if difference value is less, then carry out step-type accurate adjustment, avoid adjusting range excessive depending on current differential size.The setting that hysteresis is interval, stepping is interval, being all for avoiding frequent operation and the object avoiding regulating by a relatively large margin, mainly for the state after digital APC loop stability, ensureing stability.
If current differential exceeds this first range threshold, and also exceed this second range threshold, namely current differential is arranged in outside the stepping interval of Fig. 3, then described microcontroller regulates the size of described bias current in the mode of regressive, namely regulates the size of described bias current in the mode that stepping is more and more less.Adjustment mode in the technical program is the proportion expression adjustment mode in Fig. 3, second time described above judges, if current differential is too large, then carry out proportion expression coarse adjustment, ensure the processing speed of algorithm, after proportion expression adjustment each time, the difference between adjusted value and standard value is more and more less, and namely bias current size regulates in the mode that stepping is more and more less.Proportion expression adjusts, and is to allow APC approach stable point with prestissimo, accelerates the process of establishing of APC, sets up the state at initial stage mainly for digital APC loop.This several algorithm is assisted mutually, ensure that overall quick, high stability.
Described first range threshold is [-4lbs ,+4lbs], and the first range threshold can adjust according to the actual requirements.
Described second range threshold is [-8lbs ,+8lbs], and the second range threshold can adjust according to the actual requirements.
The present invention realizes based on micro-controller program, mainly below sets forth the present invention with code means and realizes details, and following code is embedded type C language compilation in the present embodiment.This technical scheme, except available C language is write, also realizes by other language, such as: JAVA.
Main program code realizes as follows:
As shown in code, performing flow process is:
1, first executive system initialization.Basic parameter, variable, initialization RAM district and chip configuration are set.
2, perform microcontroller major cycle flow process while (1).
3, DDM_GetADC, gathers real-time variable by microcontroller, and the back facet current sampling of MD completed in this stage.
4, Internal_Calibrate, according to the raw data collected, carries out software filtering, Conversion of measurement unit, and carries out digital APC process according to transformation result, and main algorithm all completes in this function.
5, DDM_SetDAC, is regulated systematic parameter by microcontroller, and the bias current of digital APC is arranged, and namely completes in this function.
6, Scan_Pin, other hardware pins are monitored, the alarm output signal in system cloud gray model.
In principal function, sampling function DDM_GetADC and parameter adjustment function DDM_SetDAC can according to different microcontroller platforms, laser driver model and adjust code, and different technical scheme details codes may difference to some extent.Conveniently program portable, is encapsulated as unified function interface here.
Internal_Calibrate is the concrete function of software algorithm.This patent will set forth codes implement process with exemplary forms.As follows:
Above in code, runadc.TxPower is MD electric current current sample values, and rundac.Aop is MD current target value, and last_apc is then the result that this calculates, and this result will be assigned to the converter of bias current adjustment in DDM_SetDAC function.Here think that MD current target value +/-4lsb scope is that hysteresis is interval, +/-8lsb scope is that accurate adjustment is interval.Owing to being flush bonding processor, MD electric current currency being greater than desired value and currency and being less than desired value and separately writing, prevent data from overflow.When MD current sampling data is greater than desired value 8lsb, then reduce bias current sets value in proportion; When MD current sampling data is greater than desired value 4lsb, bias current is carried out to the reduction of little stepping; When MD current sampling data is less than desired value 8lsb, then scale up bias current sets value; When MD current sampling data is less than desired value 4lsb, bias current is carried out to the increase of little stepping.Proportional coefficient K value, defines according to actual debug results, and K value is larger, and regulate the speed faster, convergence is poorer; K value is less, regulates the speed slower, and convergence is better, and this place actual definition is 1/2.
Here, filter function Soft_Filter_AOP is even more important.The setting of software filtering, effectively can avoid the mistake because environmental interference causes.Actual code is:
The degree of depth of filtering is controlled by constant P.Actual value is 1.The filtering degree of depth is darker, and sampling rate of change is slower, regulate the speed slower, but precision is higher.
This routine actual effect, when last_apc changes 1 lsb, MD sampled value must change about 2 lsb.The execution result of above-mentioned code is: ratio adjustment algorithm, can enter accurate adjustment state 1 time; During step by step modulating, in 2 times, steady state (SS) can be entered; Under steady state (SS), comparatively strong jamming comes interim, and only can enter into accurate adjustment state, laser instrument luminous power is influenced hardly; System stability is reliable.
This invention, based on microcontroller (MCU), by software algorithm, conventional art adds hysteresis interval, and this makes the stability of APC loop greatly strengthen, and when the interference being subject to common intensity, Output optical power can not be caused to fluctuate; Conventional art adds stepping interval, and this makes APC loop when being subject to comparatively strong jamming, and Output optical power only can be subject to slight interference; Conventional art adds proportional algorithm, and this makes greatly shorten the Time Created of APC loop.The improvement of these technology, makes digital APC, in more, performance have great lifting, and the details of changeable program meets all kinds of specific demand simultaneously.
This invention solves the restriction of simulation APC for backlight diode (MD) bandwidth, can the backlight diode (MD) of compatible bandwidth arbitrarily, the restriction of MD bandwidth can not be limited to as simulation APC circuit, substantially increase the compatibility for laser instrument.
The code that this invention is ease in use and rigorous program structure, be conveniently transplanted to any MCU platform, substantially reduce the construction cycle, reduce the cost overhead of the updating and upgrading of a product.
Although embodiment of the present invention are open as above, but it is not restricted to listed in instructions and embodiment utilization, it can be applied to various applicable the field of the invention completely, for those skilled in the art, can easily realize other amendment.Therefore do not deviating under the universal that claim and equivalency range limit, the present invention is not limited to specific details and illustrates here and the legend described.
Claims (6)
1. an Output optical power stability control method for optical module, is characterized in that, comprising:
Step one, backlight diode gather the output light of optical module, are converted into the current value becoming positive correlation to change with the power exporting light;
Step 2, by the analog to digital converter in the microcontroller in optical module, current value is converted to current digital value;
Step 3, calculate this current digital value and compare with the current digital standard value corresponding to Output optical power of optical module preset, obtain both current differential;
Step 4, the first range threshold that current differential and representative export the power swing of light to be compared, if fall in this first range threshold, then judge that Output optical power is stablized, if exceed this first range threshold, then regulated the Output optical power of described optical module by described microcontroller, until this current differential falls in this first range threshold.
2. the Output optical power stability control method of optical module as claimed in claim 1, it is characterized in that, in described step 3, the method of the Output optical power of described optical module is regulated to be by described microcontroller: the size regulating the bias current on laser diode, finally to change the Output optical power of optical module.
3. the Output optical power stability control method of optical module as claimed in claim 2, it is characterized in that, in described step 3, also comprise the second range threshold that representative exports the power swing of light, described second range threshold is greater than described first range threshold, if current differential exceeds this first range threshold, but do not exceed this second range threshold, then described microcontroller is with the size waiting the mode entered to regulate described bias current step by step.
4. the Output optical power stability control method of optical module as claimed in claim 3, it is characterized in that, if current differential exceeds this first range threshold, and also exceed this second range threshold, then described microcontroller regulates the size of described bias current in the mode of regressive, namely regulates the size of described bias current in the mode that stepping is more and more less.
5. the Output optical power stability control method of optical module as claimed in claim 4, it is characterized in that, described first range threshold is [-4lbs ,+4lbs].
6. the Output optical power stability control method of optical module as claimed in claim 4, it is characterized in that, described second range threshold is [-8lbs ,+8lbs].
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Cited By (5)
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| CN110572216A (en) * | 2019-09-17 | 2019-12-13 | 成都芯瑞科技股份有限公司 | optical module APC control software implementation method |
| CN111835413A (en) * | 2020-07-26 | 2020-10-27 | 武汉永鼎光通科技有限公司 | Monitoring system capable of monitoring, adjusting and testing optical module in real time |
| CN112104424A (en) * | 2020-09-03 | 2020-12-18 | 南京捷澳德信息科技有限公司 | High-temperature extinction ratio optimization method for 5G forward-transmission industrial-grade optical module |
| CN112312103A (en) * | 2020-10-21 | 2021-02-02 | 华域视觉科技(上海)有限公司 | Laser projection feedback adjustment system and method and vehicle |
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