CN105242739B - A kind of bias current temperature control method - Google Patents
A kind of bias current temperature control method Download PDFInfo
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- CN105242739B CN105242739B CN201510726438.2A CN201510726438A CN105242739B CN 105242739 B CN105242739 B CN 105242739B CN 201510726438 A CN201510726438 A CN 201510726438A CN 105242739 B CN105242739 B CN 105242739B
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Abstract
The invention discloses a kind of temperature control bias current supply circuit, bias current temperature control method and the laser driver using the temperature control bias current supply circuit, by using the variation relation of the temperature resistance of NTC thermistor, the temperature control change of voltage is realized, the temperature control change of bias current is further realized with this.Solve that the required component present in laser bias current supply circuit of the prior art is more, take the problem of PCB arrangement spaces are more and part component port is not fully utilized, the temperature controlled topological circuit of simplified laser bias current is reached, the device cost of laser driver is reduced, while improving the utilization rate of component.
Description
Technical field
The present invention relates to optical communication field, more particularly to a kind of temperature control bias current supply circuit, bias current temperature control side
Method and laser driver.
Background technology
In optical communication system, the performance characteristics of laser are that parameter can change with temperature, with the rise of temperature, are swashed
Very big drift can occur for the threshold current of optical diode, while electro-optical efficiency can successively decrease therewith.Laser driver conduct
Laser is the important component of transmitting terminal, and required driving current is provided for laser, and driving current includes modulation electricity
Stream and bias current, modulation electric current are exactly the high-speed digital signal of transmission, and bias current is mainly used in opening the threshold value of laser.
Laser requirement be operated in -40 DEG C to+85 DEG C within the temperature range of average light power it is stable, but because of temperature
During change, the threshold current of laser can change, in order to ensure that average light power is constant, it is necessary to according to the temperature of laser diode
Variation characteristic is spent to adjust the size of bias current.
Many sizes that bias current is adjusted using automated power control mode in the prior art, as shown in figure 1, by three poles
The voltage change that pipe is varied with temperature and produced, generation difference is compared with reference voltage Vref, difference is passed through into operational amplifier
Chip amplifies, and goes to control the base voltage Vb of amplifying circuit triode, so as to amplify the bias current for flowing through from colelctor electrode and penetrating level
Ibias, to realize that bias current Ibias is varied with temperature to adapt to the change of laser temperature characteristic.
The core of above-mentioned bias current temperature control circuit and realization, which are characterized by, enables base voltage Vb to rise with temperature
And increase, reduced with temperature drop.However, the Vb change control methods used in above-mentioned temperature control circuit need to use triode and
Operational amplifier chip, the PCB arrangement spaces of occupancy are relatively more, while a few road amplifications of operational amplifier are not all of also
There is 1 tunnel vacant.
Therefore, fabric swatch space resources, cost of implementation, chip utilization rate are considered, above-mentioned bias current temperature control circuit is real
, there is the space that can optimize in existing efficiency and non-optimal.
The content of the invention
In view of this, in order to which the component needed for existing laser bias current temperature control circuit is more, the PCB cloth of occupancy
Office space is relatively more, and part component port is not the problem of be fully utilized, a kind of temperature control bias current of present invention offer
Supply circuit, by using simple thermistor replace original complicated circuit, reduce PCB arrangement spaces occupancy there is provided
The utilization rate of component.
In order to solve the above problems, temperature control bias current supply circuit of the invention, applied to laser driver, including：
Temperature adjustable voltage division circuit, its voltage input end connection dc source VCC, carries out partial pressure to dc source VCC, is
Controllable voltage Vb needed for bias current generating circuit, controllable voltage Vb value increases with the rise of laser temperature；
Bias current generating circuit, connects the voltage output end of the temperature adjustable voltage division circuit, is that the laser is carried
The bias current I for for varying with temperaturebias。
Wherein, temperature adjustable voltage division circuit includes：The branch in parallel that negative tempperature coefficient thermistor RT is formed with resistance R1
Road and resistance R2, one end connection power supply VCC of parallel branch, the other end are grounded by resistance R2, parallel branch and resistance R2
One end of connection is set to partial pressure on voltage output end, resistance R2 as the controllable voltage Vb.
Correspondingly, present invention also offers a kind of bias current temperature control method, comprise the following steps：
The reason of controllable voltage Vb needed for temperature range interior biasing current generating circuit of the acquisition laser in normal work
Think value Vb' and error burst；
Temperature adjustable voltage division circuit is set up for the biasing using negative tempperature coefficient thermistor RT, resistance R1 and resistance R2
Current generating circuit provides the controllable voltage Vb, sets up the expression formula of the controllable voltage Vb；
Make the error between the controllable voltage Vb and its described ideal value Vb' in the range of the error burst, obtain
Negative tempperature coefficient thermistor RT, resistance R1 and resistance R2 resistance described in the temperature adjustable voltage division circuit；
The temperature adjustable voltage division circuit is that the laser is provided with temperature in the temperature range of the normal work
The controllable voltage Vb of change.
Wherein, the ideal value Vb' and error burst acquisition comprise the following steps：
The temperature range of the normal work is divided into low-temperature range and high temperature is interval, in the low-temperature range with 20 DEG C
Choose sample temperature point for interval, interval in the high temperature with 5 DEG C is that sample temperature point is chosen at interval, the low-temperature range for [-
40 DEG C, 20 DEG C], high temperature interval for (20 DEG C, 85 DEG C]；
To a sample temperature point, observe the light eye pattern of the laser output light, with light eye pattern it is optimal when biased electrical miscarry
Base voltage Vb needed for raw circuit as the sample temperature point ideal value Vb'；The base voltage Vb is further adjusted, is seen
The change of the smooth eye pattern is examined, the smooth eye pattern is recorded and is deteriorated institute to corresponding base voltage Vb, draw the sample temperature point
Error burst；
The common factor of the error burst of all sample temperature points is taken, each resistance in the solution temperature adjustable voltage division circuit is used as
Error burst.
Further, obtain negative tempperature coefficient thermistor RT, resistance R1 described in the temperature adjustable voltage division circuit and
Resistance R2 resistance uses EXCEL Programmings.
The present invention, which is also provided, a kind of includes the laser driver of above-mentioned temperature control bias current supply circuit.
Compared with prior art, the present invention has the advantage that：The temperature control bias current supply circuit of the present invention, biased electrical
Flow temperature control method and use the laser driver of the temperature control bias current supply circuit to make use of temperature-resistance of NTC thermistor
The variation relation of value, realizes the temperature control change of voltage, and the temperature control change of bias current is further realized with this.With very small
Circuit topological structure and considerably less Material Cost realize the temperature control of laser works bias current, improve component
Utilization rate.
Brief description of the drawings
Fig. 1 is that existing bias current is produced and temperature control circuit；
Fig. 2 is the connection diagram of laser driver and laser in the present invention；
Fig. 3 is temperature control bias current supply circuit schematic diagram in the present invention；
Fig. 4 is temperature adjustable voltage division circuit structure chart；
Fig. 5 is bias current generating circuit structure chart；
Fig. 6 is the ideal value Vb' and actual value Vb of temperature adjustable voltage division circuit output voltage comparison diagram.
Embodiment
The present invention is further described with reference to embodiment.
Laser driver in Fig. 2 includes temperature control bias current supply circuit 1, laser drive circuit 2, laser drive circuit
2 be that laser 3 provides modulation electric current Imod, temperature control bias current supply circuit 1 be laser 3 provide can vary with temperature it is inclined
Put electric current Ibias。
Temperature control bias current supply circuit includes in Fig. 3：Temperature adjustable voltage division circuit 11 and bias current generating circuit 12,
Temperature adjustable voltage division circuit 11 connects power supply VCC, and partial pressure is carried out simultaneously to supply voltage with the performance change of temperature according to laser 3
The controllable voltage Vb varied with temperature is provided for bias current generating circuit 12, temperature control bias current supply circuit 1 is in voltage Vb
In the presence of produce the bias current I that can vary with temperaturebias。
Temperature adjustable voltage division circuit 11 includes negative tempperature coefficient thermistor (NTC thermistor) RT and resistance R1 in Fig. 4
Parallel branch and resistance R2, one end connection power supply VCC of parallel branch, the other end is grounded by resistance R2, parallel branch
The partial pressure being provided with resistance R2 one end being connected on voltage output end, resistance R2 is used as the controllable of bias current generating circuit 12
Voltage Vb.Above-mentioned resistance R1 and resistance R2 are optimal using 1% precision resistance.
The temperature adjustable voltage division circuit 11, RT in Fig. 4, R1 parallel equivalent resistances=RT × R1/ (RT+R1) are then defeated
The value for going out voltage Vb is：Vb=VCC × R2/ [R2+RT × R1/ (RT+R1)], resistance RT=R25 × exp of NTC thermistor
In { BN [1/ (T+273) -1/298] }, formula, R25 represents specified zero-power resistance of the thermistor in 25 degree of normal temperature,
T is temperature (thermodynamic temperature, unit is K), and BN is the material constant of NTC thermistor, is called heat sensitive index, exp represent with
Natural number e is the index (e=2.71828 ...) at bottom.
The voltage of the base stage connection temperature adjustable voltage division circuit 11 of triode Q in Fig. 5 in bias current generating circuit 12
Output end, and be grounded by electric capacity C；Transmitting collection is grounded by resistance R3, and colelctor electrode passes through resistance R4 connecting lasers 3, three poles
Pipe Q base voltage Vb changes, and the electric current ICE for flowing through emitter stage from colelctor electrode then changes accordingly, is laser
Bias current Ibias, △ Ibias=the △ Vb/R3, △ provided represents variable quantity.
Negative tempperature coefficient thermistor RT, resistance R1, resistance R2 resistance pass through in said temperature adjustable voltage division circuit 11
Following steps are determined：
(1) voltage Vb ideal value Vb' and error burst of the laser needed in the range of normal working temperature are obtained
The normal working temperature interval of laser is：- 40 DEG C~85 DEG C, during the performance design of laser, preferentially
Consider condition of high temperature laser performance, therefore by the temperature range of normal work be divided into low-temperature range [- 40 DEG C, 20 DEG C] and
High temperature it is interval (20 DEG C, 85 DEG C], interval in low temperature section with 20 DEG C is that sample temperature point is chosen at interval, between high-temperature petiolarea with
5 DEG C for interval choose sample temperature point, obtain series of temperature point -40, -20,0,20,25,40,45,50,55,60,65,70,
75th, 80,85, power supply VCC magnitude of voltage is set to 3.3V.
By experimental simulation, the base voltage needed for debugging bias current generating circuit respectively under each sample temperature point
Experimental voltage value so that eye pattern of the output light of connecting laser in oscillograph is optimal, then by under each temperature spot
Ideal value Vb' is depicted as a optimal compensation curve；Further regulation experiment magnitude of voltage, observes the change of the smooth eye pattern, note
The corresponding experimental voltage of light eye pattern variation is recorded, the error burst of the sample temperature point is drawn；Take the mistake of all sample temperature points
Poor interval common factor, as final error burst, draws the error between voltage Vb and ideal value Vb' in ± 0.5V scopes
Interior, it is optimum state that eye pattern state, which can be assumed that,.
(2) resistance for solving resistance R1 and resistance R2 causes voltage Vb curve to approach ideal value Vb' curve.
Resistor network topology is set according to the temperature adjustable voltage division circuit 11 in Fig. 4, each member of laser drive circuit is connected
Device and laser so that the output voltage Vb of temperature control bias current supply circuit 1 change direction is with the voltage being actually needed
Value Vb' change directions are consistent.So, just obtained and original by relative saving PCB fabric swatch space and in the way of saving Material Cost
The first laser compensation of more complicated implementation closely.
R1, R2 resistance initial value to be solved is preset, then calculating is iterated using software, in the hope of meeting |
The optimal solution of Vb-Vb'|≤0.5, the performance of optimal solution is relevant with the size of initial value and iterations.Such as the present embodiment
The value of each element in resistor network is calculated by the functional simulation of EXCEL programming evaluations so that Vb change curves and experiment actual measurement device
The desired voltage Vb' curves that part needs are as consistent as possible.
EXCEL programming evaluation functions are also referred to as assuming analysis tool, i.e.,：Assuming that analysis process passes through in changing unit lattice
Value checks that these change influence to formulae results in worksheet.By programming evaluation, as shown in table 1, will to directly or
Connect the one group cell related to the formula in Set cell to be handled, can try to achieve on worksheet in some Set cell
The optimal value of formula.The specified value for changing cell R1, R2 of adjustment, tries to achieve specified knot from Set cell formula
Really.
Table 1 EXCEL programming evaluation resistance R1 and resistance R2 form
Solution procedure is as follows：
As shown in fig. 6, laser target voltage Vb=0.52V required at normal temperatures, according to formula：Vb=3.3V ×
R2/ [R2+RT × R1/ (RT+R1)] show that R1//RT equivalent resistance should be approached at normal temperatures with the ratio relation of R2 resistance
6:1；
Power consumption in view of resistance pressure-dividing network should be as small as possible, therefore resistance R1, R2 preferably use the electricity of 10K ranks
Resistance, according to result of calculation, with reference to the gear of 1% precision resistance, set R1 and R2 initial value as：R2=10K Ω, R1=62K Ω,
Thermistor RT simultaneously in parallel with R1 should be much larger than 62K Ω, the equivalent electric after such resistance R1 is in parallel with thermistor RT
Resistance just can be closer to 62K Ω.
Table 2 is often with the series specification of thermistor
The series specification of optional conventional thermistor in table 2 is brought into above-mentioned Vb calculation formula, draws and selects normal temperature
Resistance 470K Ω, resulting Vb curves overall trend relatively aim curve.Determine after thermistor specification according to 1% essence
The gear of cipher telegram resistance, by R1, R2 is finely tuned and is substituted into calculating, final to determine R2=10K Ω or 12K Ω, R1=62K Ω, can
To find out that the ideal value Vb' of temperature adjustable voltage division circuit output voltage in Fig. 6 is consistent with actual value Vb change curve, and each
Actual value Vb on temperature spot is close to ideal value Vb'.
The preferred embodiment of the present invention described in detail above, still, the present invention are not limited in above-mentioned embodiment
Detail, in the range of the technology design of the present invention, a variety of equivalents can be carried out to technical scheme, this
A little equivalents belong to protection scope of the present invention.
Claims (2)
1. a kind of bias current temperature control method, applied to laser driver, it is characterised in that comprise the following steps：
The ideal value of controllable voltage Vb needed for temperature range interior biasing current generating circuit of the acquisition laser in normal work
Vb' and error burst；
Temperature adjustable voltage division circuit is set up for the bias current using negative tempperature coefficient thermistor RT, resistance R1 and resistance R2
Generation circuit provides the controllable voltage Vb, sets up the expression formula of the controllable voltage Vb；
Make the error between the controllable voltage Vb and its described ideal value Vb' in the range of the error burst, obtain described
Negative tempperature coefficient thermistor RT, resistance R1 and resistance R2 resistance described in temperature adjustable voltage division circuit；
The temperature adjustable voltage division circuit is provided in the temperature range of the normal work for the laser and varied with temperature
The controllable voltage Vb；
The ideal value Vb' and error burst acquisition comprise the following steps：
The temperature range of the normal work is divided into low-temperature range and high temperature is interval, between the low-temperature range is with 20 DEG C
Every choosing sample temperature point, sample temperature point is chosen for interval with 5 DEG C in high temperature interval, the low-temperature range is [- 40
DEG C, 20 DEG C], high temperature interval for (20 DEG C, 85 DEG C]；
To a sample temperature point, observe the light eye pattern of the laser output light, with light eye pattern it is optimal when bias current produce electricity
Controllable voltage Vb needed for road as the sample temperature point ideal value Vb'；It is corresponding when further adjustment light eye pattern is optimal
Controllable voltage Vb, observes the change of the smooth eye pattern, records the corresponding controllable voltage Vb of the smooth eye pattern variation, show that this is adopted
The error burst of sample temperature spot；
The common factor of the error burst of all sample temperature points is taken, the mistake for solving each resistance in the temperature adjustable voltage division circuit is used as
It is poor interval.
2. bias current temperature control method according to claim 1, it is characterised in that obtain the temperature adjustable voltage division circuit
Described in negative tempperature coefficient thermistor RT, resistance R1 and resistance R2 resistance using EXCEL programming evaluations.
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| CN106155688A (en) * | 2016-07-05 | 2016-11-23 | 江苏奥雷光电有限公司 | A kind of linear deflection algorithm with lower limit being applicable to optical module production |
| CN112909735B (en) * | 2021-01-19 | 2022-09-16 | 索尔思光电（成都）有限公司 | Multi-channel laser bias current correction circuit and method |
| CN114756070B (en) * | 2022-04-01 | 2024-06-11 | 苏州海光芯创光电科技股份有限公司 | Design method of silicon optical chip with automatic temperature control function |
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| JP3449898B2 (en) * | 1997-10-16 | 2003-09-22 | 富士通株式会社 | Light emitting element drive circuit |
| US6055252A (en) * | 1998-09-10 | 2000-04-25 | Photonic Solutions, Inc. | Fiberoptic transmitter using thermistor to maintain stable operating conditions over a range of temperature |
| JP2004281566A (en) * | 2003-03-13 | 2004-10-07 | Alps Electric Co Ltd | Semiconductor laser drive circuit |
| US20090040904A1 (en) * | 2003-11-18 | 2009-02-12 | Toshio Matsumoto | Laser Driving Device, Optical Head Incorporating Laser Driving Device, and Optical Disk Apparatus |
| CN101453270B (en) * | 2007-12-04 | 2013-04-24 | 无锡江南计算技术研究所 | Laser driver and temperature compensation circuit thereof |
| CN201413927Y (en) * | 2009-06-17 | 2010-02-24 | 深圳新飞通光电子技术有限公司 | APC AND cut-off circuit for electroabsorption externally-modulated laser |
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