CN106885643B - The temperature computation method and device of laser in a kind of optical module - Google Patents
The temperature computation method and device of laser in a kind of optical module Download PDFInfo
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- CN106885643B CN106885643B CN201710214363.9A CN201710214363A CN106885643B CN 106885643 B CN106885643 B CN 106885643B CN 201710214363 A CN201710214363 A CN 201710214363A CN 106885643 B CN106885643 B CN 106885643B
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- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
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Abstract
Present invention discloses the temperature computation methods and device of laser in a kind of optical module, this method comprises the following steps: after the electrical power of optical module mutates, in particular time range, the detected value of temperature sensor is subtracted to the temperature difference of a gradual change, to obtain the temperature of laser；Wherein, the temperature difference is in the particular time range, from the first steady state temperature difference before mutation to the second steady state temperature difference gradual change after mutation.The temperature that the present invention obtains laser is more nearly the actual temperature of laser, thereby may be ensured that optical module steady operation, improves the working performance of optical module.
Description
Technical field
The present invention relates to optical communication field, in particular to the temperature computation method and device of laser in a kind of optical module.
Background technique
Optical transceiver module is (in the art by SFP (Small Form-factor Pluggable, small pluggable)
It is also referred to simply as optical module) it is common device in optical communication field.
Only one photoelectric conversion circuit of SFP optical module and electro-optical conversion circuit, contain sharp in electro-optical conversion circuit
Light device.As shown in Figure 1, being the thermal environment schematic diagram of SFP optical module typical package structure.The encapsulating structure includes: PCB, temperature
Sensor (such as forming one with the CPU of SFP optical module), laser, laser driver and shell, PCB are located in shell
Portion, temperature sensor and driver are typically secured on PCB, and laser guarantees that the heat of laser passes through shell close to shell
It is dissipated in environment.Laser driver is the main heating source for causing entire SFP optical module temperature change, is in SFP optical module
Under working condition, the temperature difference between the temperature of temperature sensor and the temperature of laser be it is stable, that is, exist a stable state temperature
Difference.In the prior art, the temperature obtained by detection temperature sensor is needed, to calculate the temperature of laser.
Laser in SFP optical module is semiconductor laser, and the temperature of laser is very heavy for SFP optical module
It wants, because temperature directly affects the working characteristics of laser.
As shown in Fig. 2, being Output optical power (or to luminous power, hereinafter referred optical power before being known as) P of laser0
With the relationship between temperature and total forward drive current I (i.e. the sum of bias current and modulation electric current, hereinafter referred to as driving current)
Schematic diagram.
Fig. 2 also describes the binary system on off keying modulation of laser.Wherein, binary one signal is indicated with shining,
Optical power is P at this time1；Binary zero signal is indicated with not shining, optical power is P at this time0.In order to make laser quick
Open and close, send 0 signal when laser not can enter depth off state, need weaker optical power P0,
I other words usually when sending 0 signal, the optical power of laser is not zero.P1And P0Ratio be defined as extinction ratio Er.Extinction ratio
Er has a great impact to indexs such as the sensitivity of receiver.
It can further be seen from figure 2 that the luminous threshold current Ith of laser, hair at different temperature (room temperature and high temperature)
Light efficiency (slope of room temperature oblique line and high temperature oblique line in such as Fig. 2) all changes.When driving current is I0, driving current I0
Greater than room temperature Ith and it is less than high temperature Ith, if the temperature of laser is room temperature, laser can be with normal luminous, optical power
P1；If the temperature of laser is high temperature, laser shines weak very more, optical power P0, front and back optical power difference is away from up to several
Again to tens times.
Typically, it needs to apply a bias current to laser according to the temperature of laser, then in bias current
On the basis of laser apply or do not apply modulation electric current, issue optical power P to reach control laser1Or P0.As shown in Fig. 2,
If laser is practically in the condition of high temperature, if the laser temperature that is calculated is room temperature, it will cause and be calculated
Bias current is room temperature bias current, even if being applied with room temperature modulation electric current to laser, laser still can not issue light function
Rate P1, it will tremendous influence generated to the extinction ratio Er of laser, and communication system very high for reliability requirement, it must
It must guarantee that the average light power Pavg and Er of laser cannot change, that is, optical power P1 and P0 constant.
In the prior art, the detected value (temperature) by obtaining temperature sensor is generally required, then by the detected value
A temperature difference is subtracted, so that the temperature of laser is obtained, and the temperature difference is to search to obtain according to the variation of the electrical power of SFP optical module
The corresponding stable temperature difference.
However, there are bigger differences for the temperature and the temperature of actual laser of the laser that the prior art is calculated, i.e.,
Accuracy is lower, affects the working performance of CSFP optical module.
Summary of the invention
In view of this, in order to solve the temperature for the laser being calculated in optical module present in the relevant technologies and reality
The temperature of laser there is technical issues that the present invention provides a kind of temperature computation sides of laser in optical module
Method and device.
The temperature computation method of laser, includes the following steps: in a kind of optical module
After the electrical power of optical module mutates, in particular time range, the detected value of temperature sensor is subtracted
The temperature difference of one gradual change, to obtain the temperature of laser；
Wherein, the temperature difference is in the particular time range, and the first steady state temperature difference from before being mutated is to the after mutation
Two steady state temperature difference gradual changes.
The present invention also provides a kind of temperature computing device of laser in optical module, the temperature computing device is used for,
After the electrical power of optical module mutates, in particular time range, the detected value of temperature sensor is subtracted into a gradual change
The temperature difference, to obtain the temperature of laser；
Wherein, the temperature difference is in the particular time range, and the first steady state temperature difference from before being mutated is to the after mutation
Two steady state temperature difference gradual changes.
The technical solution that the embodiment of the present invention provides can include the following benefits:
In some embodiments, it is gradually increased or reduces the temperature difference between temperature sensor and laser, and according to each
The detected value of temperature sensor subtracts the temperature difference, obtains the temperature of laser, and the temperature of the laser is more nearly laser
Actual temperature thereby may be ensured that optical module steady operation, the working performance of optical module be improved, without the prior art
The temperature of temperature sensor is subtracted the steady state temperature difference after mutation and obtains the temperature of laser by such technological deficiency, and
The temperature of laser is caused to differ greatly with actual temperature.
It should be understood that the above general description and the following detailed description are merely exemplary, this can not be limited
Invention.
Detailed description of the invention
The drawings herein are incorporated into the specification and forms part of this specification, and shows and meets implementation of the invention
Example, and in specification together principle for explaining the present invention.
Fig. 1 is the package structure diagram of the optical module of some embodiments of the invention；
Fig. 2 is the relational graph in typical optical module between the Output optical power of laser and total forward drive current；
Fig. 3 is the package structure diagram of the optical module of some embodiments of the invention；
Fig. 4 is the time diagram of the optical module electrical power of one embodiment of the invention, the thermometer temperature difference；
Fig. 5 is the flow chart of the temperature computation method of laser in the optical module of an embodiment of the present invention；
Fig. 6 is the flow chart of the temperature computation method of laser in the optical module of another embodiment of the invention.
Specific embodiment
Here will the description is performed on the exemplary embodiment in detail, the example is illustrated in the accompanying drawings.Following description is related to
When attached drawing, unless otherwise indicated, the same numbers in different drawings indicate the same or similar elements.Following exemplary embodiment
Described in embodiment do not represent all embodiments consistented with the present invention.On the contrary, they be only with it is such as appended
The example of device and method being described in detail in claims, some aspects of the invention are consistent.
Find after study, the electrical power of SFP optical module mutate (such as from working condition to closed state, or
From closed state to working condition) after, the temperature of temperature sensor is not mutated instead of but, just steady after a period of time
It decides, that is to say, that in this process, the temperature difference of temperature sensor and laser is variation, until final stablize
Get off, reaches steady state temperature difference.Therefore, the temperature of laser and the temperature of actual laser that the prior art is directly calculated are deposited
In bigger difference.
In addition, based on twin-channel CSFP optical transceiver module (being also referred to simply as optical module in the art) has become at present
Miscarriage product (CSFP, Compact Small Form Factor Pluggable, compact SFP optical module；SFP, Small
Form-factor Pluggable, small pluggable optical module).Due to having the independent photoelectricity of two-way, electro-optic conversion inside CSFP
Circuit, so the space layout of optical module optical module, power consumption etc. are all complicated more many than traditional SFP optical module.
The encapsulation of CSFP optical module is similar with SFP optical module, including PCB, two lasers, two laser drivers,
Shell and one or two temperature sensor.Since temperature sensor is fixed on PCB, and on PCB different location temperature
It is not much different, the temperature difference that the temperature sensor of different location detects is little, therefore in existing many schemes, uses
One temperature sensor detects temperature, and with the temperature of this temperature computation laser.
Possible binary channels works at the same time CSFP optical module in use, or a certain channel moment stops working, or
Work is toggled between the two channels, and therefore, the change of power consumption under above-mentioned different operating mode will lead to temperature biography
Steady state temperature difference between sensor and laser changes.
In the case where the laser works in a channel, turning off or on suddenly for another laser be will lead to
The electrical power of CSFP optical module mutates, if calculating the temperature of laser according to the method for the prior art, can equally face
There are bigger differences for the temperature of above-mentioned technical problem, that is, the temperature of the laser being calculated and actual laser, and then influence
The working performance of CSFP optical module.
As shown in figure 5, being the temperature computation method of laser in the optical module of an embodiment of the present invention, including walk as follows
Suddenly.
S11, when optical module electrical power mutate after, in particular time range, by the detected value of temperature sensor
The temperature difference of a gradual change is subtracted, to obtain the temperature of laser；Wherein, the temperature difference is in the particular time range, from mutation
The first preceding steady state temperature difference is to the second steady state temperature difference gradual change after mutation.
The optical module of the present embodiment, it is not limited to which above-mentioned SFP optical module or CSFP optical module can also be other light
Module, such as: (kilomegabit electric signal, is converted to the interface unit of optical signal to GBIC by Gigabit Interface Converter
Part) etc..
In optical module, the electrical power of optical module directly affects steady between temperature sensor and laser in optical module
The state temperature difference.Steady state temperature difference refers to, under a kind of working condition of optical module (such as turn off or on or some of them channel
Close and remaining channel such as opens at the states), temperature sensor finally stable temperature (i.e. the detected value of temperature sensor) and swashs
The final temperature difference between stable temperature of light device.Description is it is found that optical module enters from a working condition from background technique
After another working condition, temperature sensor needs that final stabilization can be reached by certain time length (in particular time range)
Temperature.As shown in figure 4, in one embodiment, optical module enters binary channels from single channel work at the t0 moment and works, electricity
Power is mutated, and the temperature of temperature sensor then have passed through the variation of a period of time, finally just reaches steady at the t1 moment
Fixed, the t0 moment to t1 moment is above-mentioned certain time length (in particular time range).
Since the shell of laser and optical module is close, in the case where ambient temperature is certain, even if optical mode
The electrical power of block changes, and the temperature change of laser is also little (for example, typical temperature change is no more than 1 DEG C), will not
It makes a big impact to the working performance of laser.As shown in figure 4, in one embodiment, the temperature of laser can be considered as
It remains unchanged.
From Fig. 4 it can also be seen that optical module single channel work in the state of (before the t0 moment), temperature sensor with
The temperature difference between laser is the first steady state temperature difference, is started at the t0 moment to the t1 moment, between temperature sensor and laser
The temperature difference is gradually increased, and can be referred to as the transition temperature difference, until after reaching the t1 moment, between temperature sensor and laser
The temperature difference reach the second steady state temperature difference, in other words, the temperature difference is in particular time range from the first steady state temperature difference to the second stable state
Temperature difference gradual change.
However, Fig. 4 is only the schematic diagram of the variation of an electrical power from low to high, also there is electrical power from height in optical module
To the situation of low variation, it will be understood that in these cases, in the particular time range, temperature sensor and laser
Between the temperature difference be also from the first steady state temperature difference before mutation, by the transition temperature difference gradually become mutation after the second stable state temperature
Difference.
Due to the voltage of optical module be substantially it is stable, judge whether the electrical power of optical module mutates, can
Being realized by judging whether the electric current of optical module mutates.
The electrical power is the electric work for referring to influence the steady state temperature difference between the temperature sensor and laser in optical module
Rate, the electrical power of part (for example, laser driver) in gross electric capacity or optical module including optical module.Equally, the electricity
Stream is the electric current for referring to influence the steady state temperature difference between the temperature sensor and laser in optical module, including the total of optical module
The electric current of part (for example, laser driver) in electric current or optical module.
Corresponding current is positively correlated in the electrical power and optical module, in some embodiments, can be by detecting corresponding current
Size, the electric current is then calculated into the electrical power multiplied by corresponding voltage.Such as the total current of gross electric capacity and optical module is just
Correlation, it is local current related in local electrical power and optical module.
Judge whether the electrical power of optical module is mutated, it can be by judging the change of the electrical power of adjacent moment optical module
Change and whether is greater than power thresholds and realizes.This power thresholds can be arranged according to experiment, for example, being directed to some optical modes
Block sets power thresholds as 0.1W.
Judge whether the electric current of optical module is mutated, can be by judging the variation of electric current of adjacent moment optical module
It is no to be greater than current threshold and realize.This current threshold can be arranged according to experiment, for example, some optical modules are directed to, setting
Power thresholds are 0.1/U (A), wherein the operating voltage of U expression optical module.
In some embodiments, the corresponding pass between the steady state temperature difference and electrical power of optical module can be obtained by experiment
System, in this way, the first stable state temperature that can respectively according to the electrical power after the electrical power and mutation before mutation, before mutation is calculated
The second steady state temperature difference after difference and mutation.
In some embodiments, it is also possible to determine the first steady state temperature difference and the second steady state temperature difference according to other modes.
Corresponding table of the electrical power with steady state temperature difference can be preset, according to the electricity before the mutation of optical module according to experiment
Electrical power after power and mutation, corresponding first steady state temperature difference and the second steady state temperature difference can be obtained by searching the correspondence table.
For example, in one embodiment, electrical power and the corresponding table of steady state temperature difference are as follows:
| Electrical power | Steady state temperature difference |
| 0-0.5W | T1℃ |
| 0.5-1W | T2℃ |
| 1-1.5W | T3℃ |
| 1.5-2W | T4℃ |
The each detected value of temperature sensor subtracts the corresponding temperature difference, obtains the temperature of laser.For example, at the t0 moment,
The detected value of temperature sensor subtracts the temperature difference (the first steady state temperature difference) at this time and obtains the temperature of laser at this time；In t0 to t1
A certain moment between moment, the detected value of temperature sensor subtract the temperature for the laser that the temperature difference at this time obtains at this time, etc.
Deng.
In the prior art, temperature sensor is also to carry out detection at regular intervals to obtain detected value (temperature sensor
Temperature), then subtract a steady temperature, obtain the temperature of laser.
Through this embodiment, it is gradually increased or reduces the temperature difference between temperature sensor and laser, and according to each temperature
The detected value of degree sensor subtracts the temperature difference, obtains the temperature of laser, the temperature of the laser is more nearly the reality of laser
The temperature of temperature sensor is subtracted the stable state after mutation without technological deficiency as the prior art by border temperature
The temperature difference and the temperature for obtaining laser, and cause the temperature and actual temperature of laser.
Experimental studies have found that, the variable quantity of the temperature difference between temperature sensor and laser is to be gradually reduced by a large amount of
, as shown in figure 4, closer to the t0 moment, the slope of the transition temperature difference is got in t0 to during this particular time range of t1 moment
Greatly, that is, the variable quantity of the temperature difference is bigger, and closer to the t1 moment, the slope of the transition temperature difference is smaller, that is, the variable quantity of the temperature difference
It is smaller, until close to t1 moment slope close to 0, finally, the temperature difference between temperature sensor and laser maintains the second stable state
The temperature difference.
Therefore, in order to enable the temperature of the laser arrived is more accurate, the present invention is in front into one on the basis of embodiment
Step provides following embodiment.
It is gradually reduced the variation of the temperature difference.In this way, the detected value of temperature sensor is subtracted to the temperature difference of the gradual change, acquisition
The temperature of laser will be more accurate.
By a large amount of experimental studies have found that, the variation of the temperature difference between temperature sensor and laser closer to slope by
Decrescence small index variation, therefore, in order to enable the temperature of the laser arrived is more accurate, the base of present invention embodiment in front
Following embodiment is further provided on plinth.
Making the temperature difference is in the index variation that slope is gradually reduced.In this way, the detected value of temperature sensor is subtracted this gradually
The temperature of the temperature difference of change, the laser of acquisition will be more accurate.
As shown in fig. 6, the present invention also provides a more specifical embodiments.
Due to the temperature Ts- temperature difference of the temperature Tf=temperature sensor of laser, and the temperature difference=steady state temperature difference variable quantity T_
Total0- residue difference variation amount T_Total, therefore, the temperature Tf of laser can be calculated by algorithm below:
Tf=Ts-T_Total0+T_Total.
T_Total0 indicates that the second steady state temperature difference after the optical mode block mutation and first before the optical mode block mutation are steady
Steady state temperature difference variable quantity between the state temperature difference.The calculation method of first steady state temperature difference and the second steady state temperature difference can be according to aforementioned reality
The method for applying example is calculated.
For example, as shown in figure 4, it is binary channels work, steady state temperature difference variable quantity that if optical module changes from single channel work
It is 10 DEG C, before the temperature difference starts variation, remaining difference variation amount T_Total is 10 DEG C of steady state temperature difference variable quantity.
After 1st second, 1 DEG C of difference variation (increase), then, remaining T_Total=T_Total0-1 DEG C of difference variation amount=9
℃；
After 2nd second, the temperature difference changes 1 DEG C of (increase) again, then, remaining difference variation amount T_Total=T_Total0-1
DEG C -1 DEG C=8 DEG C；
After 3rd second, the temperature difference changes 1 DEG C of (increase) again, then, remaining difference variation amount T_Total=T_Total0-1
DEG C -1 DEG C -1 DEG C=7 DEG C；
And so on, after the 10th second, the temperature difference changes 1 DEG C of (increase) again, then, remaining difference variation amount T_Total=
T_Total0-1 DEG C -1 DEG C -1 DEG C ... 1 DEG C=0 DEG C；At this point, the temperature difference of temperature sensor and laser is finally reached steady state temperature difference
Variable quantity.
The thinking of temperature based on above-mentioned calculating laser, in the present embodiment, the temperature computation of laser in optical module
Method includes the following steps.
S21, the electrical power for calculating optical module.
S22, judge whether the current electrical power of optical module is mutated than last electrical power, if so, described in calculating
Steady state temperature difference variation between the first steady state temperature difference before the second steady state temperature difference and the optical mode block mutation after optical mode block mutation
Measure T_Total0.
Remaining difference variation amount T_Total is initialized as T_Total0.
S23, judge whether the residue steady state temperature difference variable quantity T_Total is less than temperature difference threshold, be less than institute if it is not, generating
State the difference variation amount step delta T of remaining steady state temperature difference variable quantity T_Total.
In the case that the temperature change of laser is little, the relation property between optical power and driving current will not occur
Great changes, thus will not influence the work of optical module.Therefore, a temperature difference threshold can be set, when remaining steady state temperature difference changes
It measures T_Total and is less than temperature difference threshold, then do not need to calculate the temperature of laser, otherwise, when remaining steady state temperature difference changes
It measures T_Total and is greater than temperature difference threshold, generate the difference variation amount step delta for being less than the remaining steady state temperature difference variable quantity T_Total
T.In one embodiment, temperature difference threshold is 0.5 DEG C.
In one embodiment, Δ T=k*T_Total, wherein k is greater than 0 and less than 1.
S24, the remaining steady state temperature difference variable quantity is subtracted the difference variation amount step-length as a result, to described remaining steady
State difference variation amount is updated.
In one embodiment, this step S24 can be indicated with mathematical formulae are as follows: T_Total=T_Total- Δ T.
The temperature Ts of S25, the detection temperature sensor.
S26, the temperature Ts is subtracted into the steady state temperature difference variable quantity T_Total0, along with remaining steady state temperature difference variation
Amount T_Total obtains the temperature Tf of the laser, after setting duration Δ t, returns to step S23.
As previously mentioned, temperature Tf=Ts-T_Total0+T_Total.
Since the temperature of temperature sensor gradually changes, therefore, it is necessary to after setting duration Δ t, then again into
Calculating of the row next round to the temperature of laser, to guarantee that every wheel time interval is identical.
After excessively being taken turns the temperature computation to laser, when difference variation amount T_Total be less than temperature difference threshold, then calculate
Process terminates, and obtains the temperature of final laser.
The present invention also provides the temperature computing device of laser in a kind of optical module of embodiment, the temperature computation dress
It sets and is used for, after the electrical power of optical module mutates, in particular time range, the detected value of temperature sensor is subtracted one
The temperature difference of gradual change, to obtain the temperature of laser；
Wherein, the temperature difference is in the particular time range, and the first steady state temperature difference from before being mutated is to the after mutation
Two steady state temperature difference gradual changes.
The processor of device in the embodiment executes the concrete mode operated the laser in related optical module
Detailed description is performed in the embodiment of temperature computation method, no detailed explanation will be given here.
It should be understood that the present invention is not limited to the precise structure already described above and shown in the accompanying drawings, and
And various modifications and change can executed without departing from the scope.The scope of the present invention is limited only by the attached claims.
Claims (10)
1. the temperature computation method of laser in a kind of optical module, characterized in that include the following steps:
After the electrical power of optical module mutates, in particular time range, the detected value of temperature sensor is subtracted one gradually
The temperature difference of change, to obtain the temperature of laser；
Wherein, for the temperature difference in the particular time range, the first steady state temperature difference from before being mutated is steady to second after mutation
State temperature difference gradual change, the step of temperature difference of acquisition gradual change, is as follows in the particular time range:
Calculate the steady state temperature difference variable quantity between second steady state temperature difference and first steady state temperature difference；
When remaining steady state temperature difference variable quantity is greater than temperature difference threshold, difference variation amount step-length is generated, the residue steady state temperature difference becomes
Change amount is the difference of the steady state temperature difference variable quantity and the temperature difference；
By the remaining steady state temperature difference variable quantity subtract the difference variation amount step-length as a result, becoming to the remaining steady state temperature difference
Change amount is updated, by subtracting the steady state temperature difference variable quantity described in the remaining difference variation amount acquisition for updating and obtaining
The temperature difference；
Using the difference variation amount step-length as time interval, update and the institute of the remaining steady state temperature difference variable quantity are repeated
The step of stating differential thermal calculation, until updating the obtained remaining steady state temperature difference variable quantity is less than the difference variation amount step-length.
2. the method as described in claim 1, characterized in that according to the corresponding pass between preset steady state temperature difference and electrical power
System, the second steady state temperature difference after the first steady state temperature difference and the mutation before calculating the mutation.
3. the method as described in claim 1, characterized in that the variable quantity of the temperature difference is gradually reduced.
4. the method as described in claim 1, characterized in that the temperature difference is in the index variation that slope is gradually reduced.
5. the method as described in claim 1, characterized in that whether the electrical power for judging optical module the step of mutation occurs
Are as follows:
Judge the electrical power of optical module described in current time and whether the difference of the electrical power at moment is greater than function before current time
Rate threshold value.
6. the temperature computing device of laser in a kind of optical module, characterized in that the temperature computing device is used for, and works as optical module
Electrical power mutate after, in particular time range, the detected value of temperature sensor is subtracted to the temperature difference of a gradual change, to obtain
Obtain the temperature of laser；
Wherein, for the temperature difference in the particular time range, the first steady state temperature difference from before being mutated is steady to second after mutation
State temperature difference gradual change, the step of temperature difference of acquisition gradual change, is as follows in the particular time range:
Calculate the steady state temperature difference variable quantity between second steady state temperature difference and first steady state temperature difference；
When remaining steady state temperature difference variable quantity is greater than temperature difference threshold, difference variation amount step-length is generated, the residue steady state temperature difference becomes
Change amount is the difference of the steady state temperature difference variable quantity and the temperature difference；
By the remaining steady state temperature difference variable quantity subtract the difference variation amount step-length as a result, becoming to the remaining steady state temperature difference
Change amount is updated, by subtracting the steady state temperature difference variable quantity described in the remaining difference variation amount acquisition for updating and obtaining
The temperature difference；
Using the difference variation amount step-length as time interval, update and the institute of the remaining steady state temperature difference variable quantity are repeated
The step of stating differential thermal calculation, until updating the obtained remaining steady state temperature difference variable quantity is less than the difference variation amount step-length.
7. device as claimed in claim 6, characterized in that according to the corresponding pass between preset steady state temperature difference and electrical power
System, the second steady state temperature difference after the first steady state temperature difference and the mutation before calculating the mutation.
8. device as claimed in claim 6, characterized in that the variable quantity of the temperature difference is gradually reduced.
9. device as claimed in claim 6, characterized in that the temperature difference is in the index variation that slope is gradually reduced.
10. device as claimed in claim 6, characterized in that whether the electrical power for judging optical module the step being mutated occurs
Suddenly are as follows:
Judge the electrical power of optical module described in current time and whether the difference of the electrical power at moment is greater than function before current time
Rate threshold value.
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| CN101802577A (en) * | 2007-06-29 | 2010-08-11 | 通快激光与***工程有限公司 | Monitoring the temperature of an optical element |
| CN104682192A (en) * | 2013-01-06 | 2015-06-03 | 青岛海信宽带多媒体技术有限公司 | Method and device for generating temperature lookup table of optical module |
| CN103401607A (en) * | 2013-07-09 | 2013-11-20 | 青岛海信宽带多媒体技术有限公司 | Method and device for acquiring monitoring temperature of optical module |
| CN204286642U (en) * | 2014-12-30 | 2015-04-22 | 中国华录集团有限公司 | A kind of LASER Light Source working state detection device based on DLP chip |
| CN106301591A (en) * | 2016-08-31 | 2017-01-04 | 青岛海信宽带多媒体技术有限公司 | Maintain the method and device that extinction ratio is stable |
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