CN1988418B - Method for automatic scaling light module - Google Patents
Method for automatic scaling light module Download PDFInfo
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- CN1988418B CN1988418B CN2005101350291A CN200510135029A CN1988418B CN 1988418 B CN1988418 B CN 1988418B CN 2005101350291 A CN2005101350291 A CN 2005101350291A CN 200510135029 A CN200510135029 A CN 200510135029A CN 1988418 B CN1988418 B CN 1988418B
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Abstract
This invention discloses a method for automatically calibrating optical modules, which collects input optical power and monitors sample data of voltages correspondingly utilizing the current hardware technology, utilizes a multinomial fitting method to fit out a function relation of the two to be stored in an optical module after analyzing the sample data and eliminating abnormal points, which can automatically calibrate optical modules quickly, simply and accurately.
Description
Technical field
The present invention relates to digital fiber transmission system technical field, relate in particular to a kind of method of optical module being carried out auto-scaling.
Background technology
The monitoring method of optical module input optical power is normally utilized the photoelectric effect of optical module interior lights receiving device.When the light of different capacity is input on the receiving plane of light receiving element, light receiving element produces corresponding photoelectric current, change-over circuit by optical module inside can and be converted to voltage signal with this photo-signal sampling, and the value of this voltage signal is corresponding with the value of input optical power.
So-called " calibration " demarcates the relation between the signal of telecommunication of the optical module monitoring output input optical power corresponding with it exactly, and the feasible signal of telecommunication by optical module monitoring output can obtain its corresponding input optical power information exactly.
Obtaining a kind of mode of input optical power value by the monitoring voltage of input optical power observation circuit output, is the functional relation that obtains between the two, according to functional relation between the two, just can obtain the value of input optical power accurately by this voltage signal.Because light receiving element has certain discreteness, therefore for each light receiving element, the functional relation between monitoring voltage signal and the input optical power is different.This functional relation is similar to and obtains by the monitoring voltage of many groups input optical power of each module and input optical power data being carried out fitting of a polynomial usually.
Obtain the another kind of method of input optical power value by the monitoring voltage of input optical power observation circuit output, it is the pairing monitoring voltage of each power points that is recorded in the Optical Receivers input dynamic range, as write down corresponding monitoring voltage value every 0.25dB, form both tables of comparisons, and it is stored in the memory of inside modules.In actual use, at first gather input optical power monitoring voltage value,, obtain pairing input optical power value this moment then by searching the table of comparisons.
Owing to adopt the method for fitting of a polynomial, only need store respective function relation between the two, than the table of comparisons method inside modules memory resource is taken lessly, and the monitoring accuracy of input optical power will get well, so generally adopt polynomial fitting method.
At present, adopting manual method to gather these data usually, as shown in Figure 1, is the schematic diagram of existing manual calibration mode.The calibration light of standard sources output through behind the manual adjustable optical attenuator, is divided into equal-sized two-way light by 50/50 coupler, and one road light is sent to Optical Receivers, and another road light is sent to light power meter.The optical power monitoring voltage test points of Optical Receivers is received universal instrument, and the luminous power size that Optical Receivers received is then directly read from light power meter, and corresponding input optical power monitoring voltage is measured with universal instrument.The attenuation of manual setting adjustable optical attenuator writes down adjusted light power meter reading and universal instrument reading, repeatedly repeats this process, obtains abundant data.
The method image data of manual calibration need expend the plenty of time, is unfavorable for enhancing productivity, and reduces production costs.In addition, in the process of artificial acquisition and recording data, make mistakes easily, error is bigger, will cause final fitting coefficient inaccurate.
Summary of the invention
The invention provides a kind of method of optical module being carried out auto-scaling, its purpose is, utilize existing hardware technology, fast, easy, exactly optical module is carried out auto-scaling, realization is surveyed the efficient accent of optical module, thoroughly changes the present situation that manual calibrating method workload is big, efficient is low, precision is not high.
The invention provides and a kind of optical module is carried out the method for auto-scaling, comprise the steps:
(1) automatically controlled variable optical attenuator and 50/50 coupler are carried out initialization, and the sampling order of definite auto-scaling;
(2) according to determined sampling order, automatically controlled variable optical attenuator is decayed to the calibration light inlet successively, calibration light inlet after decay all is divided into two-beam through coupler at every turn, after the first bundle light enters the etalon optical power detector, gather and preserve gained input optical power value, after the second bundle light enters target optical module undetermined, gather and preserve gained monitoring voltage value;
(3) analytical procedure (2) auto-scaling is gathered the sampled data of gained, rejects exceptional data point wherein;
(4) according to final sampled data, simulate the functional relation between input optical power and the monitoring voltage, and this functional relation is stored in the target optical module undetermined.
Use automatic marking method of the present invention, utilize the existing hardware technology, by a hardware debug platform, can realize quick, easy, calibration accurately to the luminous power of optical module, realization is surveyed the efficient accent of optical module, thereby enhances productivity greatly and product quality, and effectively reduces production cost, can cooperate with other instrument, be used for fields such as the research and development of digital fiber communication system or digital fiber-optic network and production.
Description of drawings
Fig. 1 is the manual robot scaling equipment schematic diagram in the background technology;
Fig. 2 is the optical module automatic calibration device schematic diagram according to the embodiment of the invention;
Fig. 3 is the flow chart to the optical module automatic marking method according to the embodiment of the invention;
Fig. 4 carries out the concrete implementing procedure figure of auto-scaling according to the embodiment of the invention to optical module.
Embodiment
Below in conjunction with accompanying drawing and preferred embodiment automatic marking method of the present invention is elaborated.
The input optical power monitoring calibration of optical module, need obtain by many groups experimental data is carried out match, in order to reach the monitoring of input optical power accurately in the overall optical reception dynamic range, less than positive and negative 0.5dB, need to gather lot of data as the optical power monitoring error to guarantee the accuracy of fitting of a polynomial.Calibration process need be finished on a kind of optical module automatic calibration device, as shown in Figure 2, is the device schematic diagram (this device is applied for a patent in addition) that carries out the optical module auto-scaling.
Than existing manual calibration mode, automatic marking method of the present invention, will adopt following link to guarantee calibration precision:
1. at hardware aspect
Adopt high-precision automatically controlled VOA (automatically controlled variable optical attenuator, Voltage-Controled VariableOptical Attenuators), automatically controlled VOA finishes the operation of regulating light decrement automatically by driving its inner stepping motor, and then reaches the purpose of automatic adjusting luminous power.Automatically controlled VOA compare with manual VOA have step-length little (0.2dB), the precision height (characteristics of error＜0.2dB).
2. aspect software
The main auto-scaling process of three steps realizations of dividing to optical module:
1) initialization of robot scaling equipment;
Wherein, the most important thing is 50/50 coupler is calibrated.Manual calibration in the past, need 50/50 coupler equally, needed to select splitting ratio in the past very near 50/50 coupler, could guarantee in the calibration process of back, not introduce error, and manually unfavorable 50/50 coupler is calibrated, because of the introducing error is too big, and can not reach the purpose of accurate calibration usually.Among the present invention, auto-scaling by PC control, at first gather the splitting ratio data under a series of different luminous powers, computed in software by host computer goes out calibration factor and it is stored, so that the luminous power that guarantees to enter standard P IN with this calibration factor is consistent with the luminous power that enters optical module at host computer " ".
2) power is gathered automatically;
Within the full detection range of luminous power, gather power automatically every 0.2dB attenuation (the minimal adjustment step-length of existing automatically controlled EVOA), sampled point density is tens times under the manual mode.Relative hand adjustment VOA, EVOA has higher degree of regulation and adjustable range, for fitting function more accurately provides the data assurance.
3) image data is analyzed the rejecting abnormalities data point;
According to the predetermined principle that legalizes, reject the abnormity point in the sampled data, guarantee the accuracy of fitting data.The detection data that manually write down because test point is less, can also be lacked for the data point of analyzing before, and are on the low side to the precision that data are analyzed, thereby can not pick out exceptional data point more exactly.
4) data fitting.
According to final sampled data, simulate the functional relation between input optical power and the monitoring voltage.Usually this functional relation is a multinomial (common n=3) of n time.What facts have proved that 3 order polynomials can be more accurate simulates functional relation between power and the voltage, satisfies the requirement of system to sampling precision in sample range.If increase n, then can increase sampled point quantity greatly, thereby increase the sampling time, reduced calibration efficient, so n gets 3 just enough usually.
According to Fig. 2, the calibration light inlet enters automatically controlled VOA, and master cpu is by the attenuation of the automatic VOA of circuit adjustment on the calibration plate, and the bright dipping after the VOA decay is divided into equal two-beam, enters standard P IN pipe and target optical module undetermined respectively.If the splitting ratio of 50/50 coupler is inaccurate, then can during sampling calibration factor be taken into account by the calibration factor that records in advance, the data that sampling obtains are calibrated.
As shown in Figure 3, be automatic marking method flow chart of the present invention, comprising:
Step 301: automatically controlled variable optical attenuator and 50/50 coupler are carried out initialization, and the sampling order of definite auto-scaling;
Step 302: according to determined sampling order, automatically controlled variable optical attenuator is decayed to the calibration light inlet successively, calibration light inlet after decay all is divided into two-beam through coupler at every turn, after the first bundle light enters the etalon optical power detector, gather and preserve gained input optical power value, after the second bundle light enters target optical module undetermined, gather and preserve gained monitoring voltage value;
Step 303: analytical procedure 302 auto-scalings are gathered the sampled data of gained, reject exceptional data point wherein;
As shown in Figure 4, be a detail flowchart of realizing the optical module auto-scaling according to automatic marking method shown in Figure 3, concrete steps are as follows:
CPU can accurately monitor input optical power by standard P IN pipe and programmable amplifying circuit thereof, crossing conference for fear of the calibration light inlet causes damage to optical module and standard P IN pipe, at first will regulate the attenuation of VOA, it is made as maximum, to guarantee importing the luminous power of optical module and standard P IN pipe less than safety detection power, obtain the input optical power value of this moment, simultaneously, CPU also obtains the monitoring voltage of the input optical power of optical module by the higher A/D sampler of precision.
When receiving the order that host computer begins to calibrate, can determine type of module to be calibrated according to the data that host computer transmits, judgement is to APD (avalanche photodide, Avalanche Photo Diode) optical module, still the optical module of PIN is calibrated, thereby the power samples scope of setting optical module is (for the laser that PIN receives and APD receives, the input optical power scope difference of permission, PIN is at 0dbm-21dbm, and APD allows sampled point at-9dbm-31dbm).CPU regulates VOA and reduces attenuation, thereby increase the luminous power of input optical module, sampling obtains the monitoring voltage of the input optical power of optical module once more, and the input optical power value of standard P IN pipe gained, circulation repeatedly like this, arrive certain value (still in the power bracket of permission) greatly until luminous power, and then increase the VOA attenuation to reduce input optical power, circulation once more, obtain one group of new data, like this, to input optical power and monitoring voltage sampling, one group of several input optical power value and corresponding monitoring voltage value have been obtained by automatically.
These group data to automatic collection gained are carried out statistical analysis, according to the condition that legalizes that defines, to the sampled data analysis that legalizes.In analysis, adopt suitable statistical method to find out abnormity point automatically, and it is weeded out.
Then, available least square fitting goes out input optical power and the corresponding monitoring voltage relation equation between the two, i.e. functional relation between the two, and the coefficient of equation write EEPROM (Electrically Erasable Read Only Memory) in the optical module.
The laser that receives for APD has used the multinomial on one three rank to carry out match:
y＝Ax
3+Bx
2+Cx+D
For the PIN type of receipt,, then adopt the multinomial of single order to fit because voltage and input optical power are essentially linear relationship:
Y=Cx+D (thinking that A and B are 0)
After this fixed byte in the EEPROM in optical module writes corresponding coefficient A, B, C, the D of match gained.
In addition, CPU is before beginning to regulate VOA, and whether the luminous power that can monitor input standard P IN satisfies scope, satisfies, and then proceeds; Otherwise, need provide the too big or too little alarm of input optical power.After calibration finishes, also need the attenuation of VOA is adjusted to maximum, to prevent to damage optical module and standard P IN.
If in the auto-scaling process, mistake occurs, then initiatively return failed message, to inform host computer and prompting failure position to host computer.
In the auto-scaling process, all be that software by host computer carries out automatically to the data acquisition of calibration, input optical power and the monitoring voltage of 50/50 coupler and formula fitting.Like this, the calibration required time shortens greatly, and module of previously manual calibration needs dozens of minutes, now as long as just can finish less than one minute.Because of not needing artificial participation during the whole calibration, and calibration precision is significantly improved, and precision reaches more than the 0.5dB in detection range, is difficult to when this former employing is manually calibrated realize.
Should be understood that; the above-mentioned description at specific embodiment of the present invention is comparatively concrete; therefore can not think the restriction of scope of patent protection of the present invention; for a person skilled in the art; can make various possible changes or distortion by technical conceive according to the present invention, and all these changes or distortion all should belong to the protection range of claims of the present invention.
Claims (9)
1. one kind is carried out the method for auto-scaling to optical module, it is characterized in that, comprises the steps:
(1) automatically controlled variable optical attenuator and 50/50 coupler are carried out initialization, and the sampling order of definite auto-scaling, this step comprises: the sampling step length of determining automatically controlled variable optical attenuator, and its attenuation transferred to maximum, according to the type of waiting to calibrate optical module, determine calibration sampled power scope; Gather the splitting ratio data under the different luminous powers, go out the calibration factor of calibration factor 50/50 coupler beam split by the computed in software of host computer; With the sampling step length of determining, sample to the order of minimum value again to maximum from the minimum value of calibration sampled power scope, as the sampling order of auto-scaling;
(2) according to determined sampling order, automatically controlled variable optical attenuator is decayed to the calibration light inlet successively, calibration light inlet after decay all is divided into two-beam through coupler at every turn, after the first bundle light enters the etalon optical power detector, gather and preserve gained input optical power value, after the second bundle light enters target optical module undetermined, gather and preserve gained and detect magnitude of voltage;
(3) sampled data that auto-scaling is gathered gained in the analytical procedure (2) is rejected exceptional data point wherein;
(4), simulate the functional relation between input optical power and the detection voltage, and this functional relation is stored in the target optical module undetermined according to sampled data.
2. the method for claim 1 is characterized in that, further comprises:
Before beginning was gathered automatically, whether the luminous power of monitoring input etalon optical power detector satisfied sample range, otherwise sends the too big or too little alarm of input optical power.
3. the method for claim 1 is characterized in that, step (2) further comprises:
If the splitting ratio of described 50/50 coupler is not 50/50 o'clock, the gained sampled data needs with the calibration factor of coupler beam split the gained sampled data to be calibrated.
4. the method for claim 1 is characterized in that, step (3) comprising:
According to the predetermined condition analysis sampled data that legalizes, adopt suitable statistical method to find exceptional data point automatically and with its rejecting.
5. the method for claim 1 is characterized in that, step (4) comprising:
According to sampled data, select suitable match mode, simulate the functional relation between input optical power and detection voltage;
The gained functional relation is stored in the memory of target optical module undetermined, described memory is an Electrically Erasable Read Only Memory.
6. the method for claim 1 is characterized in that, further comprises:
When in the auto-scaling process, mistake occurring, initiatively return failure information to host computer, and prompting failure position.
7. the method for claim 1 is characterized in that, described target optical module undetermined is an avalanche photodide type optical module, adopts one three rank multinomial that the sampled data of avalanche photodide type optical module is carried out match in the step (4).
8. the method for claim 1 is characterized in that, described target optical module undetermined is a PIN type optical module, adopts a single order multinomial that the sampled data of PIN type optical module is carried out match in the step (4).
9. the method for claim 1 is characterized in that, gathers and preserve the step of input optical power and detection voltage in the described step (2), comprising:
Gather the signal of telecommunication of etalon optical power detector and target optical module undetermined;
The described signal of telecommunication is sent into programmable amplifying circuit and is carried out the signal amplification after the modulus collection;
Signal after amplifying is sent into master cpu, and and then send into host computer;
Input optical power and detection voltage are kept at master cpu or/and in the host computer.
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| CN2005101350291A CN1988418B (en) | 2005-12-23 | 2005-12-23 | Method for automatic scaling light module |
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| CN2005101350291A CN1988418B (en) | 2005-12-23 | 2005-12-23 | Method for automatic scaling light module |
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| CN1988418A CN1988418A (en) | 2007-06-27 |
| CN1988418B true CN1988418B (en) | 2010-08-18 |
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Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101145840B (en) * | 2007-07-16 | 2012-02-29 | 中兴通讯股份有限公司 | An automatic marking method and device for optical communication system single board |
| CN101217310B (en) * | 2007-12-26 | 2012-06-20 | 华为技术有限公司 | Optical power measuring device and method |
| CN101908927B (en) * | 2010-06-17 | 2012-05-02 | 成都优博创技术有限公司 | Method for extrapolating and testing sensitivity of light receiving device |
| CN107547128B (en) * | 2016-06-23 | 2022-06-07 | 中兴通讯股份有限公司 | Method and device for calibrating light-emitting power of optical module |
| CN107543951A (en) * | 2016-06-24 | 2018-01-05 | 中兴通讯股份有限公司 | A kind of optical module on-Line Voltage detection means and method |
| CN108123757B (en) * | 2016-11-30 | 2021-01-26 | 上海国盾量子信息技术有限公司 | Device and method for rapid automatic calibration and attenuation control based on MCVOA |
| CN107515389B (en) * | 2017-07-21 | 2020-05-12 | 北京遥测技术研究所 | High-precision calibration system for satellite-borne laser radar detector |
| CN113258999B (en) * | 2021-06-25 | 2021-09-17 | 武汉联特科技股份有限公司 | Method for calibrating optical power reported by optical receiving module, optical receiving module and medium |
| CN113438021B (en) * | 2021-07-28 | 2022-09-09 | 武汉光迅科技股份有限公司 | Calibration method and device for optical power detection, electronic device and storage medium |
| CN113959492B (en) * | 2021-10-22 | 2023-01-10 | 苏州森峰智能装备有限公司 | Light path protection monitoring system of self-adaptation threshold value |
| CN114966360B (en) * | 2022-07-27 | 2022-10-25 | 成都光创联科技有限公司 | System and method for testing avalanche voltage of optical device |
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| CN1444349A (en) * | 2002-03-08 | 2003-09-24 | 华为技术有限公司 | Digital regulated light receiving module and its regulating method |
| CN2618376Y (en) * | 2003-04-20 | 2004-05-26 | 五邑大学 | Long-range monitoring terminal |
| CN1696719A (en) * | 2004-05-14 | 2005-11-16 | 华为技术有限公司 | Automatic calibrating device and method |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1444349A (en) * | 2002-03-08 | 2003-09-24 | 华为技术有限公司 | Digital regulated light receiving module and its regulating method |
| CN2618376Y (en) * | 2003-04-20 | 2004-05-26 | 五邑大学 | Long-range monitoring terminal |
| CN1696719A (en) * | 2004-05-14 | 2005-11-16 | 华为技术有限公司 | Automatic calibrating device and method |
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