CN104393479B - Laser full-life self-adaptive state control method - Google Patents
Laser full-life self-adaptive state control method Download PDFInfo
- Publication number
- CN104393479B CN104393479B CN201410678328.9A CN201410678328A CN104393479B CN 104393479 B CN104393479 B CN 104393479B CN 201410678328 A CN201410678328 A CN 201410678328A CN 104393479 B CN104393479 B CN 104393479B
- Authority
- CN
- China
- Prior art keywords
- laser
- current
- bias current
- laser instrument
- imax
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Abstract
The invention discloses a laser life-cycle self-adaptive state control method, which comprises the following steps: parameter setting step: (11) detecting a saturation current value Is of the laser; (12) setting a maximum limit value Imax of the bias current; (13) setting a critical temperature value Tth; self-adaptive adjustment: (21) detecting the working current I of the laser and the working temperature T of the laser in real time; (22) comparing the magnitude relation between the working current I of the laser and the maximum limit value Imax of the bias current, and starting the APC circuit when I is less than Imax; and when the I is larger than or equal to Imax, comparing the magnitude relation between the working temperature T of the laser and the critical temperature Tth, and if the T is larger than or equal to the Tth, closing the APC circuit and starting the nonlinear control method. The control method of the invention overcomes the limitation of the APC circuit control on the whole performance constraint of the laser, and exploits the potential of the laser and the optical power can be made larger.
Description
Technical field
The invention belongs to field of laser device technology, is to be related to a kind of laser instrument total life cycle self adaptation state specifically
Control method.
Background technology
Optical transmission module mainly includes drive circuit unit, single chip machine controlling circuit unit, optical assembly, external control circuit
Several parts such as unit, signal of telecommunication input interface.Driver（Chip）The effect of circuit unit is to provide the bias current of laser instrument
With modulation electric current, so as to realize digital signal electrical/optical change.The major function of single chip machine controlling circuit unit is to driving core
Piece is controlled, so that the Output optical power of laser instrument keeps normal condition（I.e. luminous power is exported on certain power level simultaneously
Keep stable）.In order that luminous power output is on certain power level and keeps stable, mainly adopt at present, Power Control
Circuit, laser driver, laser instrument, form feedback loop to complete, so that optical output power of laser tends to fixed
Value.The leading indicator launching light power P of module and Extinction ratio, the bias current for mainly being provided to laser instrument by driving chip
The Slop efficiency Se of the threshold current Ith and P-I curve of Ibias and modulation electric current Imod and laser instrument is determined.In module work
Ambient temperature when changing or after long term device work is aging, the threshold current and Slop efficiency of laser instrument can become
Change, showing as threshold current increases and Slop efficiency reduction, in order to maintain the relative constancy of luminous power, module to apply to laser instrument
Bias current Ibias and modulation electric current Imod will increase, but can not be simply increase bias current by way of,
Because the working condition of laser instrument is after into saturation region, luminous power can reduce with the increase of bias current, biased electrical
Stream reaches to a certain degree or even can damage laser instrument.
In order to realize the protection to laser instrument, it is common practice to set the maximum limit of bias current by driver chip
Definite value so that the maximum limit value is less than saturation current, such as sets the biasing of maximum laser device by an external sampling resistor
Electric current.Because the performance of laser instrument has individual variation, the saturation current of laser instrument is also not quite similar, in order to adapt to industrial metaplasia
Producing needs, and meets the protection demand of all laser instrument, typically can more guard what threshold limit value set, and its value is full far below actual
And current value, the defect of this kind of mode is the overall performance for sacrificing laser instrument, and it is too small that threshold limit value is arranged, and limits laser
Device performance gives full play to, and after laser works electric current reaches limit value, control circuit can suddenly close APC circuits, it
Afterwards the luminous power of laser instrument will be no longer controlled, laser works in fixed bias current limit value, so, with laser instrument
Heating or the change of ambient temperature, the luminous power of laser instrument changes therewith, it is impossible to ensure that communication is normal, and practical situation is very
Big a part of laser instrument completely can again increasing bias current by way of stabilized illumination power because its threshold limit value arrives it
There is certain regulation space between saturation current value.
The content of the invention
The present invention is in order to solve the problems, such as that existing laser instrument fully can not work in its total life cycle, it is proposed that a kind of sharp
Light device total life cycle self adaptation condition control method, can solve the above problems.
In order to solve above-mentioned technical problem, the present invention is employed the following technical solutions and is achieved：
A kind of laser instrument total life cycle self adaptation condition control method, comprises the following steps：
Parameter setting step：
（11）, detection laser saturation current value Is；
（12）, arrange bias current threshold limit value Imax, wherein Imax ＜ Is；
（13）, arrange critical temperature value Tth；
Automatic adjusument step：
（21）, real-time detection laser works electric current I, and laser. operating temperature T；
（22）, relatively more described laser works electric current I and bias current threshold limit value Imax magnitude relationship, as I ＜
During Imax, APC circuits are opened, drive circuit for laser is controlled by the APC circuits；
As I >=Imax, the magnitude relationship of the comparison laser. operating temperature T and critical temperature value Tth, if T >=
Tth, then close APC circuits, enables nonlinear control method, and by control unit the drive circuit for laser is directly controlled.
Further, in the step（22）In, as I >=Imax and T ＜ Tth, if now for APC circuits to laser instrument
Drive circuit is controlled, then keep the APC circuits to open, and still drive circuit for laser is carried out by the APC circuits
Control, if being now nonlinear control method, opens APC circuits, switches to APC circuits to control drive circuit for laser
System.
Further, the step（22）In, the method that the APC circuits are controlled to drive circuit for laser
For：
The light of a1, PD photo-detector detection laser transmitting, and convert optical signals to the signal of telecommunication；
The signal of telecommunication is amplified process by a2, amplifying circuit, and is sent to comparator and be compared, and will compare knot
Fruit is sent to laser drive circuit；
If a3, the signal of telecommunication are less than default threshold value, the drive circuit for laser increase is carried in the laser
Bias current on device, otherwise, reduction is carried in the bias current on the laser instrument.
Further, the step（22）In, the nonlinear control method is：
B1, real-time monitoring current lasers work temperature；
B2, corresponding under lookup current lasers work temperature bias current Tb from look-up table；
B3, control laser drive current are carried on the laser instrument with bias current Tb.
Further, the step（11）In, the method for saturation current value Is of detection laser be：From can open
Luminous threshold bias current Ith of laser instrument starts, and with step-length △ I bias current value is increased, and corresponding detection laser lights
Luminous power, calculate bias current often increase corresponding luminous power rate of increase during △ I, when rate of increase be equal to zero when, then it is current
Bias current value is saturation current value Is.
Compared with prior art, advantages of the present invention and good effect are：The laser instrument total life cycle self adaptation of the present invention
Condition control method, by Parameter setting step, saturation current value Is of detection laser；And arranged according to saturation current value Is
Threshold limit value Imax of bias current, without again for the ease of commercial production, unification is set to fixed threshold limit value, is arranged
Limit value it is different because of laser instrument, be capable of it is maximized play laser instrument performance, by APC circuits control mutually tie with nonlinear Control
Close, suitable control mode selected according to the working condition of laser instrument, on the one hand overcome that the control of APC circuits brings to laser
The limitation of device overall performance constraint, still further aspect has excavated the potential of laser instrument, and luminous power can do more, and works the longevity
Life is greatly prolonged, and the reliability of product has bigger raising, and product can apply among more severe special environment, can
The special light module product for meeting specific demand is developed with the laser instrument using common commercial level or technical grade specification.
After the detailed description of embodiment of the present invention is read in conjunction with the accompanying, the other features and advantages of the invention will become more
Plus it is clear.
Description of the drawings
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
The accompanying drawing to be used needed for having technology description is briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, can be with
Other accompanying drawings are obtained according to these accompanying drawings.
Fig. 1 be in laser instrument total life cycle self adaptation condition control method proposed by the invention laser optical power with it is inclined
Put electric current（P-I）Graph of relation.
Specific embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation is described, it is clear that described embodiment is only a part of embodiment of the invention, rather than the embodiment of whole.It is based on
Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under the premise of creative work is not made
Embodiment, belongs to the scope of protection of the invention.
For current laser instrument according to industrial production demand, in order to protect Laser Devices to need bias current most
The day of one's doom sets up put less, and then sacrifices the overall performance of laser instrument, it is impossible to laser instrument is given full play in its total life cycle
A kind of problem of its performance, it is proposed that laser instrument total life cycle self adaptation condition control method, gives the control of two kinds of laser instrument
Mode processed, this method is adaptively selected according to real-time detection laser works electric current I and the magnitude relationship of its actual saturation current
The control mode of laser instrument, can cmpletely play the service behaviour in its lifetime, excavate the potential of laser instrument, light work(
Rate can do more, and prolongation is operated in APC（Automated power control）The life-span of state laser, the environment for improving product is adapted to
Ability.
Embodiment one, the present embodiment proposes a kind of laser instrument total life cycle self adaptation condition control method, including following
Step：
Parameter setting step：
Saturation current value Is of S11, detection laser；
S12, threshold limit value Imax that bias current is set, wherein Imax ＜ Is；
S13, setting critical temperature value Tth；
Automatic adjusument step：
S21, real-time detection laser works electric current I, and laser. operating temperature T；
The magnitude relationship of threshold limit value Imax of laser works electric current I and bias current described in S22, comparison, as I ＜
During Imax, APC circuits are opened, drive circuit for laser is controlled by the APC circuits；
As I >=Imax, the magnitude relationship of the comparison laser. operating temperature T and critical temperature value Tth, if T >=
Tth, then close APC circuits, enables nonlinear control method, and by control unit the drive circuit for laser is directly controlled.
As shown in figure 1, for laser optical power and bias current（P-I）Relation curve, wherein, the saturation electricity of laser instrument
Flow valuve Is is bias current value corresponding when referring to maximum luminous power that laser instrument can be output, the working condition point of laser instrument
Spontaneous emission area, stimulated emission linear work area, saturation region.When the bias current applied to laser instrument is less than threshold current Ith
When, laser works are in spontaneous emission area, when bias current is less than saturation current Is more than threshold current Ith, laser instrument work
Make in linear zone, luminous power can increase with the increase of bias current；In saturation region, luminous power can be with bias current
Increase and reduce.Therefore, current laser instrument needs control to be operated in linear zone, and because laser instrument has individual variation, it is satisfied
It is not quite similar with current value Is, the product or the product of different model of the general same model of laser instrument of the prior art
The threshold limit value of the bias current for being set to unify size, in order to ensure the normal of all laser instrument, general bias current is most
It is less that big limit value sets, therefore sacrifices the performance of a big chunk laser instrument, that is, many laser instrument are more than the maximum limit
In the very big bias current of value is interval, linear modulation control still can be carried out, but, due to the constraint of threshold limit value, its is inclined
Putting electric current can not again exceed the threshold limit value, therefore, laser instrument is with regard to too early arrival life span.The control method of the present embodiment
The problems referred to above are solved, the detection of saturation current value Is is carried out respectively to each laser instrument, and is arranged according to its saturation current value Is
Threshold limit value Imax of bias current, the limit value of setting is different because of laser instrument, and the maximum of its bias current for arranging limits Imax
Will more existing setting value it is larger, extend laser instrument work linearly interval, be capable of it is maximized play laser instrument performance,
APC circuits are controlled in combination with nonlinear Control, to select suitable control mode according to the working condition of laser instrument, on the one hand
The limitation to the constraint of laser instrument overall performance that the control of APC circuits brings is overcome, more than the maximum electric current of bias current
Control is no longer definitely cannot be used for, it is contemplated that temperature parameter is come in, due in the interval between Imax and Is, needing basis to work as
Front most impact laser works performance is its ambient temperature reason or its own senile cause, if Current Temperatures are too high
Words, the non-linear effects of temperature do leading, therefore adopt nonlinear control method, if temperature is not too high, remains and follow
P-I curves, are controlled using APC methods, have excavated the potential of laser instrument, and luminous power can do more, and working life is prolonged significantly
Long, the reliability of product has bigger raising, and product can apply among more severe special environment, it is possible to use general
The laser instrument of logical business level or technical grade specification develops the special light module product for meeting specific demand.
As a preferred embodiment, in step S22, as I >=Imax and T ＜ Tth, if being now APC
Circuit is controlled to drive circuit for laser, then keep the APC circuits to open, still by the APC circuits to laser instrument
Drive circuit is controlled, if being now nonlinear control method, opens APC circuits, switches to APC circuits to drive laser instrument
Galvanic electricity road is controlled.Current laser status are that even bias current has exceeded setting limit value, if Current Temperatures are also
It is unlikely to high to as the principal element for affecting laser performance, because still falling within stimulated emission in the electric current interval of Imax to Is
Linear work area, only power is gradually reduced with the rate of increase of electric current, but still can control, so continuing to adopt APC
Current control, by the Function of laser instrument to maximum.
In the present embodiment, in step S22, the method that the APC circuits are controlled to drive circuit for laser
For：
The light of a1, PD photo-detector detection laser transmitting, and convert optical signals to the signal of telecommunication；
The signal of telecommunication is amplified process by a2, amplifying circuit, and is sent to comparator and be compared, and will compare knot
Fruit is sent to laser drive circuit；
If a3, the signal of telecommunication are less than default threshold value, the drive circuit for laser increase is carried in the laser
Bias current on device, otherwise, reduction is carried in the bias current on the laser instrument.
The core controlled using APC circuits is exactly feedback control idea, and the realization of function is by laser assembly
PD photo-detectors, optical power control circuit, laser driver, laser instrument, form feedback loop to complete, so that laser
Device Output optical power tends to fixed value.Its feedback control basic process is that PD photoelectric currents reduce when the Output optical power of LD is reduced,
The outfan current potential of amplifying circuit is raised, then laser drive circuit bias current increases so that the Output optical power of LD increases；
Luminous power that is contrary then making LD reduces, and so as to reach automated power control effect, the Output optical power for making LD keeps stable.
In the present embodiment, in step S22, the nonlinear control method is：
B1, real-time monitoring current lasers work temperature；
B2, corresponding under lookup current lasers work temperature bias current Tb from look-up table；
B3, control laser drive current are carried on the laser instrument with bias current Tb.
Wherein, the look-up table is that the work temperature that detection laser is tested in control program is write before laser instrument dispatches from the factory
The performance number of corresponding bias current Tb and laser instrument now when degree and laser instrument different operating temperature T, due to now
Bias current is no longer linear with power, and temperature becomes the principal element for affecting power, therefore, in known target
Power and in the case of detecting Current Temperatures, by look-up table the bias current value that currently should be modulated is found out, and is made up
The defect of APC circuit linearities control.
Further, in step S11, the method for saturation current value Is of detection laser is：From can open
Luminous threshold bias current Ith of laser instrument starts, and with step-length △ I bias current value is increased, and corresponding detection laser lights
Luminous power, calculate bias current often increase corresponding luminous power rate of increase during △ I, when rate of increase be equal to zero when, then it is current
Bias current value is saturation current value Is.
Certainly, described above is not limitation of the present invention, and the present invention is also not limited to the example above, this technology neck
Change, remodeling, addition or replacement that the those of ordinary skill in domain is made in the essential scope of the present invention, should also belong to this
Bright protection domain.
Claims (4)
1. a kind of laser instrument total life cycle self adaptation condition control method, it is characterised in that comprise the following steps：
Parameter setting step：
（11）, detection laser saturation current value Is；
（12）, arrange bias current threshold limit value Imax, wherein Imax ＜ Is；
（13）, arrange critical temperature value Tth；
Automatic adjusument step：
（21）, real-time detection laser works electric current I, and laser. operating temperature T；
（22）, relatively more described laser works electric current I and bias current threshold limit value Imax magnitude relationship, as I ＜ Imax
When, APC circuits are opened, drive circuit for laser is controlled by the APC circuits；
As I >=Imax, the magnitude relationship of the comparison laser. operating temperature T and critical temperature value Tth, if T >=Tth,
APC circuits are closed, nonlinear control method is enabled, the drive circuit for laser are directly controlled by control unit,
The step（22）In, the nonlinear control method is：
B1, real-time monitoring current lasers work temperature；
B2, corresponding under lookup current lasers work temperature bias current Tb from look-up table；
B3, control laser drive current are carried on the laser instrument with bias current Tb.
2. laser instrument total life cycle self adaptation condition control method according to claim 1, it is characterised in that in the step
Suddenly（22）In, as I >=Imax and T ＜ Tth, if being now controlled to drive circuit for laser for APC circuits, keep institute
The unlatching of APC circuits is stated, still drive circuit for laser is controlled by the APC circuits, if being now nonlinear Control side
Method, then open APC circuits, switches to APC circuits to be controlled drive circuit for laser.
3. laser instrument total life cycle self adaptation condition control method according to claim 1 and 2, it is characterised in that described
Step（22）In, the APC circuits are to the method that drive circuit for laser is controlled：
The light of a1, PD photo-detector detection laser transmitting, and convert optical signals to the signal of telecommunication；
The signal of telecommunication is amplified process by a2, amplifying circuit, and is sent to comparator and be compared, and comparative result is sent out
Deliver to drive circuit for laser；
If a3, the signal of telecommunication are less than default threshold value, the drive circuit for laser increase is carried on the laser instrument
Bias current, otherwise, reduction is carried in bias current on the laser instrument.
4. laser instrument total life cycle self adaptation condition control method according to claim 1, it is characterised in that the step
（11）In, the method for saturation current value Is of detection laser be：From luminous threshold bias current Ith of laser instrument can be opened
Start, bias current value, and the luminous luminous power of corresponding detection laser are increased with step-length △ I, calculating bias current often increases
Corresponding luminous power rate of increase during △ I, when rate of increase is equal to zero, then current bias current value is saturation current value Is.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410678328.9A CN104393479B (en) | 2014-11-24 | 2014-11-24 | Laser full-life self-adaptive state control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410678328.9A CN104393479B (en) | 2014-11-24 | 2014-11-24 | Laser full-life self-adaptive state control method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104393479A CN104393479A (en) | 2015-03-04 |
| CN104393479B true CN104393479B (en) | 2017-05-17 |
Family
ID=52611335
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410678328.9A Active CN104393479B (en) | 2014-11-24 | 2014-11-24 | Laser full-life self-adaptive state control method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104393479B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107293938A (en) * | 2017-08-15 | 2017-10-24 | 中航海信光电技术有限公司 | Method and system for prolonging service life of laser for optical module |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111327368A (en) * | 2020-02-27 | 2020-06-23 | 长飞光纤光缆股份有限公司 | Control method and device for realizing rapid APC (automatic Power control) of optical module |
| CN112054850A (en) * | 2020-08-13 | 2020-12-08 | 深圳市普威技术有限公司 | Optical power adjusting method and device, storage medium and ONU (optical network Unit) equipment |
| CN112104424B (en) * | 2020-09-03 | 2022-04-01 | 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 |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6441364B1 (en) * | 1999-06-25 | 2002-08-27 | Zvi Regev | Learned behavior optical power source controller |
| CN1507124A (en) * | 2002-12-12 | 2004-06-23 | ��ʿͨ��ʽ���� | Illuminating element driving device |
| CN1652419A (en) * | 2005-01-07 | 2005-08-10 | 清华大学 | Semiconductor laser driving current control method and multi-mode working driving power supply |
| CN102761052A (en) * | 2012-07-31 | 2012-10-31 | 青岛海信宽带多媒体技术有限公司 | Optical module working parameter adjusting method and adjusting device |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4715469B2 (en) * | 2005-11-28 | 2011-07-06 | 株式会社島津製作所 | Wavelength conversion laser temperature control circuit |
| JP5485737B2 (en) * | 2010-02-09 | 2014-05-07 | 富士通テレコムネットワークス株式会社 | Laser diode driving circuit and laser diode driving method |
-
2014
- 2014-11-24 CN CN201410678328.9A patent/CN104393479B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6441364B1 (en) * | 1999-06-25 | 2002-08-27 | Zvi Regev | Learned behavior optical power source controller |
| CN1507124A (en) * | 2002-12-12 | 2004-06-23 | ��ʿͨ��ʽ���� | Illuminating element driving device |
| CN1652419A (en) * | 2005-01-07 | 2005-08-10 | 清华大学 | Semiconductor laser driving current control method and multi-mode working driving power supply |
| CN102761052A (en) * | 2012-07-31 | 2012-10-31 | 青岛海信宽带多媒体技术有限公司 | Optical module working parameter adjusting method and adjusting device |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107293938A (en) * | 2017-08-15 | 2017-10-24 | 中航海信光电技术有限公司 | Method and system for prolonging service life of laser for optical module |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104393479A (en) | 2015-03-04 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104393479B (en) | Laser full-life self-adaptive state control method | |
| US9204514B2 (en) | Laser diode control device | |
| CN101326692B (en) | Optical transmission circuit | |
| CN101702489B (en) | Biasing circuit of electro-absorption modulated laser and debugging method thereof | |
| CN107293938B (en) | Method and system for prolonging service life of laser for optical module | |
| CN104078841B (en) | A kind of optical module laser digital Open loop temperature compensation system | |
| CN101132115A (en) | High power laser diode driver | |
| CN102447219B (en) | Optical power control circuit | |
| US20090135868A1 (en) | Optical transmitter able to resume APC operation automatically | |
| JP2012168410A (en) | Optical transmitter, optical transmitter and receiver, control method and control program | |
| CN104269737A (en) | Optical module as well as debugging system and debugging method thereof | |
| JP4566692B2 (en) | LIGHT EMITTING DIODE DRIVING DEVICE AND OPTICAL TRANSMISSION DEVICE HAVING THE SAME | |
| US10775563B2 (en) | TWDM ONU wavelength control method, system thereof and shut- off depth control circuit | |
| US8112003B2 (en) | Optical transmitter, operation controlling method for the same, and recording medium | |
| US7916765B2 (en) | Control circuit for a laser diode and a method to control a laser diode | |
| CN103236644B (en) | Regulate method and the device of small package hot-pluggable optical module working temperature | |
| CN100344083C (en) | Control method and control circuit of output light power and extinction ratio of light transmitter | |
| US6678290B2 (en) | Optical output control circuit for obtaining stable optical output power | |
| CN102496850A (en) | Stable laser light source | |
| CN101599796A (en) | Laser life-span end of a period alarm producing method | |
| JP4703312B2 (en) | Nonlinear semiconductor optical device driving apparatus | |
| CN108923252B (en) | BOB blind modulation technology-based APC (auto-noise control) anti-noise method for DFB laser | |
| JP5485737B2 (en) | Laser diode driving circuit and laser diode driving method | |
| JPH10276138A (en) | Optical transmitter | |
| CN2426248Y (en) | Optical coupling based light emission machine switch circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP03 | Change of name, title or address | ||
| CP03 | Change of name, title or address |
Address after: 266100 Songling Road, Laoshan District, Qingdao, Shandong Province, No. 399 Patentee after: Qingdao Xinghang Photoelectric Technology Co.,Ltd. Address before: 266104 Beizhai sub district office, beizhaike community, Laoshan District, Qingdao City, Shandong Province Patentee before: HISENSE & JONHON OPTICAL-ELECTRICAL TECHNOLOGIES Co.,Ltd. |