CN106885643A - 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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- CN106885643A CN106885643A CN201710214363.9A CN201710214363A CN106885643A CN 106885643 A CN106885643 A CN 106885643A CN 201710214363 A CN201710214363 A CN 201710214363A CN 106885643 A CN106885643 A CN 106885643A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K13/00—Thermometers specially adapted for specific purposes
Abstract
Present invention is disclosed the temperature computation method and device of laser in a kind of optical module, the method comprises the following steps：After the electrical power of optical module is undergone mutation, in particular time range, the detected value of temperature sensor is subtracted the temperature difference of a gradual change, to obtain the temperature of laser；Wherein, in the particular time range, the first steady state temperature difference from before being mutated is to the second steady state temperature difference gradual change after mutation for the temperature difference.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 service behaviour of optical module.
Description
Technical field
The present invention relates to optical communication field, the temperature computation method and device of laser in more particularly to a kind of optical module.
Background technology
Optical transceiver module is (in the art for SFP (Small Form-factor Pluggable, SFP)
It is also referred to simply as optical module) it is common device in optical communication field.
SFP optical module only one of which photoelectric switching circuits 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 structures.The encapsulating structure includes：PCB, temperature
Sensor (such as the CPU with SFP optical modules forms one), laser, laser driver and shell, PCB are located in shell
Portion, temperature sensor and driver are typically secured on PCB, and laser presses close to shell to ensure that the heat of laser passes through shell
It is dissipated in environment.Laser driver is the main heating source for causing whole SFP optical modules temperature change, is in SFP optical modules
Under working condition, the temperature difference between the temperature of temperature sensor and the temperature of laser is stable, i.e., in the presence of a stable state temperature
Difference.In the prior art, it is necessary to pass through temperature that detection temperature sensor obtains to calculate the temperature of laser.
Laser in SFP optical modules is semiconductor laser, and the temperature of laser is very heavy for SFP optical modules
Will, because temperature directly affects the working characteristics of laser.
As shown in Fig. 2 being Output optical power (or to luminous power, hereinafter referred luminous power before being referred to as) P of laser0
With the relation between temperature and total forward drive current I (i.e. bias current and modulation electric current sum, 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 represented with lighting,
Now luminous power is P1；Binary zero signal is represented with not lighting, now luminous power is P0.In order to make laser quick
Open and close, send 0 signal when laser can not enter depth cut-off state, it is desirable to have weaker luminous power P0,
I other words generally when 0 signal is sent, the luminous 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 threshold current Ith that laser lights at different temperature (normal temperature and high temperature), hair
Light efficiency (slope of normal temperature oblique line and high temperature oblique line in such as Fig. 2) is all changed.When driving current is I0, driving current I0
More than normal temperature Ith and less than high temperature Ith, if the temperature of laser is normal temperature, laser can be with normal luminous, luminous power
P1；If the temperature of laser is high temperature, laser lights weak very many, and luminous power is P0, front and rear optical power difference is away from up to several
Again to tens times.
Typically, it is necessary to the temperature according to laser applies a bias current to laser, then in bias current
On the basis of to laser apply or do not apply modulate electric current, with reach control laser send luminous power P1Or P0.As shown in Fig. 2
If laser is practically in the condition of high temperature, if the laser temperature being calculated is normal temperature, then can cause to be calculated
Bias current is normal temperature bias current, even if being applied with normal temperature modulation electric current to laser, laser still cannot send light work(
Rate P1, it will to the extinction ratio Er generation tremendous influences of laser, and the communication system very high for reliability requirement, must
Must ensure that the average light power Pavg and Er of laser can not change, that is, luminous 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 as to obtain the temperature of laser, and the temperature difference is to search to obtain according to the change of the electrical power of SFP optical modules
The corresponding stabilization temperature difference.
However, there is bigger difference with the temperature of actual laser in the temperature of laser that prior art is calculated, i.e.,
The degree of accuracy is relatively low, have impact on the service behaviour of CSFP optical modules.
The content of the invention
In view of this, in order to solve the temperature and reality of laser that are calculated in optical module present in correlation technique
There is the technical problem of bigger difference in the temperature of laser, the invention provides a kind of temperature computation side of laser in optical module
Method and device.
The temperature computation method of laser, comprises the following steps in a kind of optical module：
After the electrical power of optical module is undergone mutation, 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.
Present invention also offers 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 is undergone mutation, 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 scheme that embodiments of the invention are provided can include the following benefits：
In certain embodiments, gradually increase or reduce 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 service behaviour of optical module be improve, without prior art
Such technological deficiency, will the temperature of temperature sensor subtract the steady state temperature difference after mutation and obtain the temperature of laser, and
The temperature and actual temperature for causing laser differ greatly.
It should be appreciated that the general description of the above and detailed description hereinafter are only exemplary, this can not be limited
Invention.
Brief description of the drawings
Accompanying drawing herein is merged in specification and constitutes the part of this specification, shows and meets implementation of the invention
Example, and be used to explain principle of the invention together in specification.
Fig. 1 is the encapsulating structure schematic diagram of the optical module of some embodiments of the invention；
Fig. 2 is the graph of a relation between the Output optical power of laser in typical optical module and total forward drive current；
Fig. 3 is the encapsulating structure schematic diagram of the optical module of some embodiments of the invention；
Fig. 4 is the optical module electrical power of one embodiment of the invention, the time diagram of the thermometer temperature difference；
Fig. 5 be an embodiment of the present invention optical module in laser temperature computation method flow chart；
Fig. 6 be another kind embodiment of the invention optical module in laser temperature computation method flow chart.
Specific embodiment
Here explanation will be performed to exemplary embodiment in detail, its example is illustrated in the accompanying drawings.Following description is related to
During accompanying drawing, unless otherwise indicated, the same numbers in different accompanying drawings represent same or analogous key element.Following exemplary embodiment
Described in implementation method do not represent and the consistent all implementation methods of the present invention.Conversely, they be only with it is such as appended
The example of the consistent apparatus and method of some aspects being described in detail in claims, of the invention.
Found by research, the electrical power of SFP optical modules undergo mutation (such as from working condition to closed mode, or
From closed mode to working condition) after, the temperature of temperature sensor is not but mutation, but through just steady after a period of time
Decide, that is to say, that in this process, temperature sensor is change with the temperature difference of laser, until final stabilization
Get off, reach steady state temperature difference.Therefore, the temperature of the laser that prior art is directly calculated is deposited with the temperature of actual laser
In bigger difference.
In addition, twin-channel CSFP optical transceiver module (being also referred to simply as optical module in the art) has turned into master at present
Miscarriage product (CSFP, Compact Small Form Factor Pluggable, compact SFP optical modules；SFP, Small
Form-factor Pluggable, SFP optical module).There are photoelectricity, the electro-optic conversion of two-way independence due to CSFP the insides
Circuit, so the space layout of optical module optical module, power consumption etc. are all complicated more many than traditional SFP optical modules.
The encapsulation of CSFP optical modules is similar with SFP optical modules, including PCB, two lasers, two laser drivers,
Shell and one or two temperature sensor.Because temperature sensor is fixed on PCB, and on PCB diverse location temperature
It is more or less the same, the temperature difference that the temperature sensor detection of diverse location is obtained is little, therefore in existing many schemes, uses
One temperature sensor carrys out detection temperature, and with the temperature of this temperature computation laser.
Possible binary channels works CSFP optical modules simultaneously in use, or a certain passage moment is stopped, or
Work is toggled between the two channels, therefore, the change of power consumption under above-mentioned different mode of operation will cause temperature to pass
There is change in steady state temperature difference between sensor and laser.
In the case of a laser works for passage, turning off or on suddenly for another laser can cause
The electrical power of CSFP optical modules is undergone mutation, if calculating the temperature of laser according to the method for prior art, can equally be faced
There is bigger difference in above-mentioned technical problem, that is, the temperature of the laser being calculated, and then influence with the temperature of actual laser
The service behaviour of CSFP optical modules.
As shown in figure 5, be an embodiment of the present invention optical module in laser temperature computation method, including following step
Suddenly.
S11, after the electrical power of optical module is undergone mutation, 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 mutated certainly in the particular time range
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 above-mentioned SFP optical modules or CSFP optical modules, can also be other light
Module, for example：(Gigabit Interface Converter, kilomegabit electric signal is converted to GBIC the interface unit of optical signal
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 (for example turn off or on, or some of which passage
Close and remaining channel open etc. state), temperature sensor finally stabilization temperature (i.e. the detected value of temperature sensor) with swash
Temperature difference between the finally stable temperature of light device.Knowable to described in background technology, optical module enters from a working condition
After another working condition, temperature sensor is needed by certain time length (in particular time range), can reach final stabilization
Temperature.As shown in figure 4, in one embodiment, optical module enters binary channels work at the t0 moment from single channel work, its electricity
Power there occurs mutation, and the temperature of temperature sensor then have passed through the change of a period of time, finally just be reached surely at the t1 moment
Fixed, the t0 moment to t1 moment is above-mentioned certain time length (in particular time range).
Because the shell of laser and optical module is close to, therefore in the case that environment temperature is certain around, 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
Service behaviour to laser makes a big impact.As shown in figure 4, in one embodiment, the temperature of laser can be considered as
Keep constant.
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 to the t1 moment, between temperature sensor and laser at the t0 moment
The temperature difference gradually increases, 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 electrical power change from low to high, also there is electrical power from height in optical module
To the situation of low change, it will be understood that in these cases, in the particular time range, temperature sensor and laser
Between the temperature difference be also the first steady state temperature difference from before mutation, the second stable state temperature after the transition temperature difference gradually becomes mutation
Difference.
Because the voltage of optical module is substantially stabilization, therefore, judge whether the electrical power of optical module undergos mutation, can
Being realized by judging the electric current of optical module whether to undergo mutation.
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, including optical module gross electric capacity, or in optical module local (for example, laser driver) electrical power.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 optical module is total
The electric current of local (for example, laser driver) in electric current, or optical module.
The electrical power and corresponding current positive correlation in optical module, in certain embodiments, can be by detecting corresponding current
Size, the electric current is then multiplied by corresponding voltage and calculates the electrical power.The total current of such as gross electric capacity and optical module is just
Correlation, local electrical power with optical module part it is current related.
Judge whether the electrical power of optical module mutation occurs, can be by judging the change of the electrical power of adjacent moment optical module
Change and whether realized more than power thresholds.This power thresholds can be set 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 mutation occurs, the change of electric current that can be by judging adjacent moment optical module is
It is no to be realized more than current threshold.This current threshold can be set according to experiment, for example, some optical modules are directed to, setting
Power thresholds are 0.1/U (A), wherein, U represents the operating voltage of optical module.
In certain embodiments, the corresponding pass between the steady state temperature difference and electrical power of optical module can be obtained by testing
System, so, can be calculated the first stable state temperature before mutation respectively according to the electrical power after the electrical power before mutation and mutation
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.
According to experiment, the corresponding table of electrical power and steady state temperature difference can be preset, according to the electricity before the mutation of optical module
Electrical power after power and mutation, searching the corresponding table can obtain corresponding first steady state temperature difference and the second steady state temperature difference.
For example, in one embodiment, electrical power is as follows with the corresponding table of steady state temperature difference：
| 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 temperature difference (the first steady state temperature difference) that the detected value of temperature sensor is subtracted now obtains the temperature of laser now；In t0 to t1
A certain moment between moment, the temperature difference that the detected value of temperature sensor is subtracted now obtains the temperature of laser now, 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.
By the present embodiment, gradually increase or reduce the temperature difference between temperature sensor and laser, and according to each temperature
The detected value for spending sensor subtracts the temperature difference, obtains the temperature of laser, and the temperature of the laser is more nearly the reality of laser
Border temperature, without technological deficiency as prior art, will the temperature of temperature sensor subtract the stable state after mutation
The temperature difference and obtain the temperature of laser, and cause the temperature and actual temperature of laser.
By substantial amounts of experimental studies have found that, the variable quantity of the temperature difference between temperature sensor and laser is to be gradually reduced
, as shown in figure 4, during t0 to t1 moment this particular time range, closer to the t0 moment, the slope of the transition temperature difference is got over
Greatly, that is, the temperature difference variable quantity it is bigger, closer to the t1 moment, the slope of the transition temperature difference is smaller, that is, the temperature difference variable quantity
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 that the temperature of the laser for obtaining is more accurate, the present invention enters one on the basis of preceding embodiment
Step provides following examples.
It is gradually reduced the change of the temperature difference.So, the detected value of temperature sensor is subtracted the temperature difference of the gradual change, acquisition
The temperature of laser will be more accurate.
By substantial amounts of experimental studies have found that, the change of the temperature difference between temperature sensor and laser closer to slope by
Decrescence small index variation, therefore, in order that the temperature of the laser for obtaining is more accurate, base of the present invention in preceding embodiment
Following examples are further provided on plinth.
The index variation for making the temperature difference be gradually reduced in slope.So, the detected value of temperature sensor is subtracted this gradually
The temperature difference of change, the temperature of the laser of acquisition will be more accurate.
As shown in fig. 6, present invention also offers a more specific embodiment.
Due to the temperature Ts- temperature difference of the temperature Tf=temperature sensors 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 following algorithm：
Tf=Ts-T_Total0+T_Total.
T_Total0 represent the second steady state temperature difference after the optical mode block mutation with it is first steady before the optical mode block mutation
Steady state temperature difference variable quantity between the state temperature difference.The computational methods of the first steady state temperature difference and the second steady state temperature difference can be according to foregoing reality
The method for applying example is calculated.
For example, as shown in figure 4, if optical module turns to binary channels work, steady state temperature difference variable quantity from single channel work change
It it is 10 DEG C, before the temperature difference starts change, 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；
By that analogy, 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；Now, temperature sensor is finally reached steady state temperature difference with the temperature difference of laser
Variable quantity.
The thinking of the temperature based on above-mentioned calculating laser, in the present embodiment, the temperature computation of laser in optical module
Method, comprises the following steps.
S21, the electrical power for calculating optical module.
S22, judge whether the current electrical power of optical module mutation occurs than last electrical power, if so, calculating described
Steady state temperature difference change 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
Amount T_Total0.
Remaining difference variation amount T_Total is initialized as T_Total0.
S23, whether the remaining steady state temperature difference variable quantity T_Total is judged less than temperature difference threshold, if it is not, generation is less than institute
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 its luminous power and driving current will not occur
Great changes, thus do not interfere with the work of optical module.Therefore, it can set a temperature difference threshold, when the change of remaining steady state temperature difference
Amount T_Total is less than temperature difference threshold, then the temperature of laser need not be calculated, otherwise, when the change of remaining steady state temperature difference
Amount T_Total is more than temperature difference threshold, difference variation amount step delta of the generation 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 more than 0 and less than 1.
S24, the result that the remaining steady state temperature difference variable quantity is subtracted the difference variation amount step-length, to described remaining steady
State difference variation amount is updated.
In one embodiment, this step S24 can be expressed as with mathematical formulae：T_Total=T_Total- Δs T.
S25, the temperature Ts for detecting the temperature sensor.
S26, the temperature Ts is subtracted into the steady state temperature difference variable quantity T_Total0, along with the change of remaining steady state temperature difference
Amount T_Total obtains the temperature Tf of the laser, by after setting duration Δ t, returning and performing step S23.
As it was previously stated, temperature Tf=Ts-T_Total0+T_Total.
Because the temperature of temperature sensor is gradually changed, accordingly, it would be desirable to after setting duration Δ t, then enter again
Calculating of the row next round to the temperature of laser, to ensure that often wheel time interval is identical.
After through excessively taking turns the temperature computation to laser, when difference variation amount T_Total is less than temperature difference threshold, then calculate
Process terminates, and obtains the temperature of final laser.
Present invention also offers a kind of temperature computing device of laser in optical module of embodiment, the temperature computation dress
Put for after the electrical power of optical module is undergone mutation, in particular time range, the detected value of temperature sensor being subtracted into 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 concrete mode laser in relevant optical module of the computing device operation of the device in the embodiment
Detailed description is performed in the embodiment of temperature computation method, explanation will be not set forth in detail herein.
It should be appreciated that the invention is not limited in the precision architecture being described above and be shown in the drawings, and
And can without departing from the scope perform various modifications and changes.The scope of the present invention is only limited by appended claim.
Claims (10)
1. in a kind of optical module laser temperature computation method, it is characterized in that, comprise the following steps：
After the electrical power of optical module is undergone mutation, 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, the temperature difference is in the particular time range, and the first steady state temperature difference from before being mutated is steady to second after mutation
State temperature difference gradual change.
2. the method for claim 1, it is characterized in that,
According to the corresponding relation between default steady state temperature difference and electrical power, the first steady state temperature difference before the mutation and institute are calculated
State the second steady state temperature difference after mutation.
3. the method for claim 1, it is characterized in that, the variable quantity of the temperature difference is gradually reduced.
4. the method for claim 1, it is characterized in that, the index variation that the temperature difference is gradually reduced in slope.
5. the method for claim 1, it is characterized in that,
Whether the electrical power for judging optical module there is the step of being mutated：
Judge the electrical power of optical module described in current time and whether the difference of the electrical power at moment is more than work(before current time
Rate threshold value.
6. in a kind of optical module laser temperature computing device, it is characterized in that,
The temperature computing device is used for, and after the electrical power of optical module is undergone mutation, in particular time range, temperature is passed
The detected value of sensor subtracts the temperature difference of a 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 steady to second after mutation
State temperature difference gradual change.
7. device as claimed in claim 6, it is characterized in that,
According to the corresponding relation between default steady state temperature difference and electrical power, the first steady state temperature difference before the mutation and institute are calculated
State the second steady state temperature difference after mutation.
8. device as claimed in claim 6, it is characterized in that, the variable quantity of the temperature difference is gradually reduced.
9. device as claimed in claim 6, it is characterized in that, the index variation that the temperature difference is gradually reduced in slope.
10. device as claimed in claim 6, it is characterized in that,
Whether the electrical power for judging optical module there is the step of being mutated：
Judge the electrical power of optical module described in current time and whether the difference of the electrical power at moment is more than work(before current time
Rate threshold value.
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