CN108808437A - A kind of driving circuit and the optical module using the driving circuit - Google Patents
A kind of driving circuit and the optical module using the driving circuit Download PDFInfo
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- CN108808437A CN108808437A CN201810876867.1A CN201810876867A CN108808437A CN 108808437 A CN108808437 A CN 108808437A CN 201810876867 A CN201810876867 A CN 201810876867A CN 108808437 A CN108808437 A CN 108808437A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/13—Stabilisation of laser output parameters, e.g. frequency or amplitude
- H01S3/131—Stabilisation of laser output parameters, e.g. frequency or amplitude by controlling the active medium, e.g. by controlling the processes or apparatus for excitation
- H01S3/1317—Stabilisation of laser output parameters, e.g. frequency or amplitude by controlling the active medium, e.g. by controlling the processes or apparatus for excitation by controlling the temperature
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/06—Arrangements for controlling the laser output parameters, e.g. by operating on the active medium
- H01S5/068—Stabilisation of laser output parameters
- H01S5/06804—Stabilisation of laser output parameters by monitoring an external parameter, e.g. temperature
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- Electromagnetism (AREA)
- Optics & Photonics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- Semiconductor Lasers (AREA)
Abstract
The invention discloses the optical module of a kind of driving circuit and the use driving circuit, which includes temperature regulation circuit, and temperature regulation circuit includes feedback circuit, setting circuit, compensation circuit and differential amplifier circuit；The first input end of differential amplifier circuit and the output end of feedback circuit connect, and the second input terminal is connect with the output end of setting circuit, the temperature-control circuit connection of output end and laser assembly；The output end that circuit is arranged also is connect with compensation circuit；Compensation circuit is used to adjust the voltage value that setting circuit is input to differential amplifier circuit according to environment temperature, to control temperature-control circuit heating or refrigeration, to which feedback circuit is input to the voltage value of differential amplifier circuit.The present invention compensates temperature drift caused by environment temperature by compensation circuit, improves the stability of the temperature-control circuit of laser assembly, to improve the performance of optical module.
Description
Technical field
The invention belongs to optical communication fields, more particularly, to a kind of driving circuit and optical module.
Background technology
Currently, super-narrow line width laser module is widely used in phase due to its ultralow phase noise and ultra-narrow laser line spectrum
The correlative technology fields such as dry optic communication, Fibre Optical Sensor, optical fiber remote sensing.Current super-narrow line width laser module is mainly used in optical fiber
Hydrophone system, fibre optic hydrophone play this important function in oil exploration and ocean early warning.And narrow linewidth laser conduct
The core optical module of hydrophone system mainly has light source two big requirements：There is extremely low phase in low-frequency range (0-10Khz)
Noise；The Lorentz line width of ultra-narrow, linewidth requirements are less than 3KHz.
Since laser is very sensitive for temperature, laser generally has function of temperature control.Conventional laser
Temperature control circuit uses dedicated pulse width modulation (PWM) (Pulse Width Modulation, abbreviation PWM) driver, due to
The switching frequency of pwm driver inner high speed will largely effect on the stability of temperature control circuit, and the method can not ensure laser
The stability of temperature control.Meanwhile temperature change can cause temperature drift effect, can also be impacted to the stability of temperature control circuit, to
Directly influence the phase noise and line width of laser low-frequency range.
In consideration of it, it is the art urgent problem to be solved present in the prior art product to overcome the shortcomings of.
Invention content
For the disadvantages described above or Improvement requirement of the prior art, the present invention provides a kind of driving circuit and the drive is used
The optical module of dynamic circuit improves laser its object is to be compensated to temperature drift caused by environment temperature by compensation circuit
The stability of the temperature-control circuit of component, the technology for thus solving the stability difference of the temperature-control circuit of laser assembly are asked
Topic.
To achieve the above object, according to one aspect of the present invention, a kind of driving circuit is provided, including：Temperature is adjusted
Circuit 2, the temperature regulation circuit 2 include feedback circuit 21, setting circuit 22, compensation circuit 23 and differential amplifier circuit
24；The first input end of the differential amplifier circuit 24 is connect with the output end of the feedback circuit 21, the second input terminal with
The output end connection of the setting circuit 22, output end are connect with the temperature-control circuit 13 of laser assembly 1；The setting
The output end of circuit 22 is also connect with the compensation circuit 23；The compensation circuit 23 is used for according to described in environment temperature adjusting
The voltage value that circuit 22 is input to the differential amplifier circuit 24 is set, to control the heating of the temperature-control circuit 13 or system
It is cold, to adjust the voltage value that the feedback circuit 21 is input to the differential amplifier circuit 24.
Preferably, the compensation circuit 23 includes thermistor Rth, resistance R1 and resistance R2；The first of the resistance R1
End is connect with the second input terminal of the differential amplifier circuit 24, and second end is connect with the first end of the thermistor Rth,
The second end of the thermistor Rth is grounded；Second input of the first end of the resistance R2 and the differential amplifier circuit 24
End connection, second end ground connection.
Preferably, the setting circuit 22 includes resistance R3, resistance R4, resistance R5 and resistance R6；The setting circuit
The number of 22 input terminal is two, and the output end of the feedback circuit 21 is connect with the first input end of the setting circuit 22
Afterwards, then by the resistance R3 it is connect with the first input end of the differential amplifier circuit 24；The second of the setting circuit 22
After input terminal is connect with the resistance R4, then it connect with the second input terminal of the differential amplifier circuit 24；The resistance R5's
First end is connect with the second input terminal of the differential amplifier circuit 24, second end ground connection；The first end of the resistance R6 with
The first input end connection of the setting circuit 22, second end are connect with the second input terminal of the differential amplifier circuit 24.
Preferably, the feedback circuit 21 includes resistance R7 and capacitance C1；The first end of the resistance R7 and the setting
The first input end of circuit 22 connects, and second end and the output end of the temperature-control circuit 13 of the laser assembly 1 connect
It connects, to receive the feedback reference voltage of the temperature-control circuit 13 detected；The first end of the resistance R7 also with it is described
The first end of capacitance C1 connects, the ground connection of the second end of the capacitance C1.
Preferably, the driving circuit further includes pre-amplification circuit 5 and control circuit 3；The pre-amplification circuit 5
Input terminal connect with the optical detector 11 of the laser assembly 1, the input terminal of output end and the control circuit 3 connects
It connects, the output end of the control circuit 3 is connect with the input terminal of the setting circuit 22；The control circuit 3 is used for according to institute
The voltage value exported to the setting circuit 22 is arranged in the monitoring result for stating pre-amplification circuit 5.
Preferably, the input terminal of the control circuit 3 is also connect with the temperature-control circuit of the laser assembly 1 13；
The control circuit 3 is used for according to the feedback temperature of the temperature-control circuit 13 and the monitoring of the pre-amplification circuit 5
As a result the voltage value exported to the setting circuit 22 is set.
Preferably, the driving circuit further includes current driving circuit 4；The input terminal of the current driving circuit 4 and institute
The output end connection of control circuit 3 is stated, output end is connect with the laser 12.
Preferably, the current driving circuit 4 includes filter circuit 41, current setting circuit 42 and modulate circuit 43；
The input terminal of the filter circuit 41 is connect with the output end of the control circuit 3, output end and the current setting circuit
42 input terminals connect；The first input end of the modulate circuit 43 connects DC offset voltage, the connection modulation of the second input terminal
Signal, output end are connect with the input terminal of the current setting circuit 42.
Preferably, the control circuit 3 includes analog to digital conversion circuit 31, controller 32 and D/A converting circuit 33；Institute
The input terminal for stating analog to digital conversion circuit 31 is connect with the output end of the pre-amplification circuit 5, output end and the controller
32 input terminal connection；The output end of the controller 32 is connect with the input terminal of the D/A converting circuit 33, the digital-to-analogue
The output end of conversion circuit 33 is connect with the input terminal of the setting circuit 22.
It is another aspect of this invention to provide that provide a kind of optical module, the optical module include laser assembly 1 and on
The driving circuit described in aspect is stated, the laser assembly 1 and the output end of the differential amplifier circuit 24 of the driving circuit connect
It connects.
In general, through the invention it is contemplated above technical scheme is compared with the prior art, have following beneficial to effect
Fruit：The driving circuit of the present invention includes temperature regulation circuit, which includes feedback circuit, setting circuit, compensation
Circuit and differential amplifier circuit；Compensation circuit, which is used to adjust setting circuit according to environment temperature, is input to differential amplifier circuit
Voltage value, to control temperature-control circuit heating or refrigeration, to which feedback circuit is input to the voltage of differential amplifier circuit
Value.To achieve the effect that compensate to temperature drift caused by environment temperature, the temperature-control circuit of laser assembly is improved
Stability, and then improve the performance of optical module.
Description of the drawings
Fig. 1 is a kind of structural schematic diagram of optical module provided in an embodiment of the present invention；
Fig. 2 is a kind of structural schematic diagram adjusting circuit provided in an embodiment of the present invention；
Fig. 3 is a kind of structural schematic diagram of current driving circuit provided in an embodiment of the present invention；
Fig. 4 is the phase noise test curve of the optical module and the light source of optical module in the prior art output of the present invention；
Fig. 5 is the frequency noise test curve of the optical module and the light source of optical module in the prior art output of the present invention；
Fig. 6 is that whether there is or not the temperature-compensating test curves of compensation circuit for driving circuit of the invention.
Specific implementation mode
In order to make the purpose , technical scheme and advantage of the present invention be clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.As long as in addition, technical characteristic involved in the various embodiments of the present invention described below
It does not constitute a conflict with each other and can be combined with each other.
The present embodiment provides a kind of optical module, which includes laser assembly 1 and driving circuit, wherein laser
Device assembly 1 includes laser 12, optical detector 11, chip gain and temperature-control circuit 13, specifically, temperature control electricity
Road 13 includes semiconductor cooler TEC132 (Thermoelectric Cooler, write a Chinese character in simplified form TEC) and temperature sensing circuit
131, wherein temperature sensing circuit 131 includes thermistor, and the resistance value according to thermistor determines inside laser assembly 1
Operating temperature, wherein thermistor can be that the thermistor with positive temperature coefficient may be with negative temperature coefficient
Thermistor can be selected according to actual conditions.
Wherein, TEC132 can be made of the Peltier effect based on semi-conducting material, when DC current passes through two kinds
When the galvanic couple of semi-conducting material composition, one end heat absorption, the phenomenon that the heat release of one end.In actual use, pass through adjusting
The size of current of TEC132 and direction controlling TEC132 heating or refrigeration, and then adjust the work inside laser assembly 1
Temperature, so that laser 12 is in best working condition.The process adjusted about temperature please refer to follow-up explanation.
Wherein, driving circuit includes temperature regulation circuit 2, control circuit 3, current driving circuit 4 and preposition amplification electricity
Road 5, control circuit 3 are connect with pre-amplification circuit 5, current driving circuit 4 and temperature regulation circuit 2 respectively.Specifically, preceding
The input terminal for setting amplifying circuit 5 is connect with the optical detector 11 of laser assembly 1, the input terminal of output end and control circuit 3
The output end of connection, control circuit 3 is connect with the input terminal of setting circuit 22.Control circuit 3 is used for according to pre-amplification circuit 5
Monitoring result be arranged to setting circuit 22 export voltage value.Wherein, pre-amplification circuit 5 is used to photoelectric current being converted to the back of the body
Photovoltage, monitoring result above-mentioned can be the corresponding backlight voltage of photoelectric current that optical detector 11 is fed back.
In the present embodiment, control circuit 3 is for being arranged driving voltage, and the driving voltage is exported and drives electricity to electric current
Road 4, to which control inputs to the driving current size of laser 12.Control circuit 3 is for being arranged setting for temperature regulation circuit 2
Set voltage so that temperature regulation circuit 2 according to setting voltage and temperature sensing circuit 131 feedback voltage control laser group
The temperature-control circuit 13 of part 1 heats or refrigeration, and laser 12 is realized by the operating temperature for adjusting laser 12 to realize
Transmission power adaptation compensation function.
In order to ensure the transmission power of laser 12 meets nominal power, in practical application scene, generally from two sides
Face carries out automatic adjusument：(1) driving current of laser 12 is adjusted；(2) operating temperature of laser 12 is adjusted.In this implementation
In example, control circuit 3 swashs according to the temperature adjustment that the backlight voltage and temperature sensing circuit 131 of pre-amplification circuit 5 are fed back
The driving current of light device 12 and/or the operating temperature of laser 12 so that the transmission power of laser 12 meets nominal power.
In an alternate embodiment of the invention, when backlight voltage and control circuit 3, which are exported, to match to the driving voltage of current driving circuit 4,
Control circuit 3 exports corresponding analog voltage to setting circuit 22 and sets, and then is arranged and is input to setting in differential amplifier circuit 24
Voltage is set, to adjust the operating temperature of laser 12, to adjust the transmission power of laser 12；Alternatively, when backlight voltage with
Control circuit 3 exports when matching to the driving voltage of current driving circuit 4, and control circuit 3 inputs to electric current to resetting
The driving voltage of driving circuit 4, to adjust the transmission power of laser 12.The adjustment process of driving current about laser 12
And the adjustment process of the operating temperature of laser 12 please refer to follow-up explanation.
Wherein, control circuit 3 includes analog to digital conversion circuit 31, controller 32 and D/A converting circuit 33, analog-to-digital conversion
The input terminal of circuit 31 is connect with the output end of pre-amplification circuit 5, and output end is connect with the input terminal of controller 32；Control
The output end of device 32 is connect with the input terminal of D/A converting circuit 33, output end and the setting circuit 22 of D/A converting circuit 33
Input terminal connects.Analog to digital conversion circuit 31 is for converting analog signals into digital signal, and D/A converting circuit 33 will be for that will count
Word signal is converted to analog signal.In order to improve precision, in a preferred embodiment, analog to digital conversion circuit 31 is that 16bit is high-precision
The ADC (Analog-to-Digital Converter, write a Chinese character in simplified form ADC) of degree, D/A converting circuit 33 are the high-precision DAC of 16bit
(Digital-to-Analog Converter, write a Chinese character in simplified form DAC).Analog to digital conversion circuit 31 has multiple input end and multiple outputs
End, D/A converting circuit 33 have multiple input end and multiple output ends.
Specifically, one of analog to digital conversion circuit 31 input terminal receives the backlight electricity that pre-amplification circuit 5 is converted
Pressure, analog to digital conversion circuit 31 to backlight voltage carry out analog-to-digital conversion after, by corresponding output end export to controller 32.
Another input terminal of analog to digital conversion circuit 31 receives the temperature that temperature sensing circuit 131 acquires, and analog to digital conversion circuit 31 is right
Collecting temperature carry out analog-to-digital conversion after, by corresponding output end export to controller 32.Controller 32 is according to backlight voltage
And collecting temperature exports corresponding driving voltage and setting voltage leads to after D/A converting circuit 33 carries out digital-to-analogue conversion
It crosses corresponding output end to export driving voltage to current driving circuit 4, and voltage output will be arranged by corresponding output end
To temperature regulation circuit 2.
In the present embodiment, temperature regulation circuit 2 includes feedback circuit 21, setting circuit 22, compensation circuit 23, difference
Amplifying circuit 24 and power amplification circuit 25.The first input end of differential amplifier circuit 24 connects with the output end of feedback circuit 21
It connects, the second input terminal is connect with the output end of setting circuit 22, the temperature-control circuit 13 of output end and laser assembly 1
Connection.
In order to improve the stability of 12 temperature control of laser, and then reduce the phase noise and line of 12 low-frequency range of laser
The temperature regulation circuit 2 of width, the present embodiment further includes compensation circuit 23, by compensation circuit 23 to the error caused by temperature drift
It compensates.
Specifically, the output end of setting circuit 22 is also connect with compensation circuit 23, compensation circuit 23 is used for according to environment
Temperature adjusts the setting voltage that setting circuit 22 is input to differential amplifier circuit 24, to control the heating of temperature-control circuit 13 or system
It is cold, realize the function of the operating temperature of automatic adjusument laser 12.When the operating temperature of laser 12 changes, temperature detection
The reference voltage that circuit 131 exports can also change therewith, and then feedback circuit 21 is input to differential amplifier circuit 24
Feedback voltage, until laser 12 stable operating voltage, to adjust the transmission power of laser 12.Wherein, difference is put
Big circuit 24 is used for output error signal, and the error signal is inputed to power amplification circuit 25, power amplification circuit 25 according to
Sense of current is determined according to error signal, and then controls TEC132 heating or refrigeration.Detailed electricity about temperature regulation circuit 2
Line structure please refer to follow-up explanation.
In the present embodiment, the input terminal of current driving circuit 4 is connect with control circuit 3, current driving circuit 4 it is defeated
Outlet is connect with laser 12, the modulation for the driving voltage and extraneous output that current driving circuit 4 is exported according to control circuit 3
Signal is that laser 12 provides its driving current, to ensure that the transmission power of laser 12 is met the requirements.Specifically, electric current drives
Dynamic circuit 4 includes filter circuit 41, current setting circuit 42 and modulate circuit 43, input terminal and the control electricity of filter circuit 41
The output end on road 3 connects, and output end is connect with 42 input terminal of current setting circuit；The first input end of modulate circuit (43)
DC offset voltage is connected, the second input terminal connects modulated signal, the input terminal of output end and current setting circuit (42)
Connection.Wherein, the driving voltage that filter circuit 41 is used to export control circuit 3 is filtered, and will be after filtering
Driving voltage is exported to current setting circuit 42, and modulate circuit 43 is for being converted to the bipolar modulation signal of extraneous input terminal
Unipolar modulated signal, and exported after being filtered to current setting circuit 42, to provide driving for laser 12
Electric current.Detailed circuit structure about current driving circuit 4 please refer to follow-up explanation.
Referring to Fig.2, Fig. 2 shows the particular circuit configurations of temperature regulation circuit 2.
Specifically, compensation circuit 23 includes thermistor Rth, resistance R1 and resistance R2, wherein thermistor Rth is
The precision of negative tempperature coefficient thermistor, resistance R1 and resistance R2 are 0.1%, and temperature drift coefficient is the precision resistance of 5ppm.Due to
Its resistance value of the thermistor of negative temperature coefficient has exponent relation and non-linear relation with variation of ambient temperature, and optical module is in height
Temperature drift is linear change when temperature work, and variable quantity is smaller.After introducing resistance R1 and resistance R2, negative temperature coefficient can be reduced
The nonlinear effect of thermistor, while the offset of the equivalent resistance of compensation circuit 23 under high/low temperature work can be reduced.If
Circuits 22 include resistance R3, resistance R4, resistance R5 and resistance R6, and feedback circuit 21 includes resistance R7 and capacitance C1.
Wherein, the first end of resistance R1 is connect with the second input terminal of differential amplifier circuit 24, second end and temperature-sensitive electricity
Hinder the first end connection of Rth, the second end ground connection of thermistor Rth；The of the first end of resistance R2 and differential amplifier circuit 24
Two input terminals connect, second end ground connection.
In the present embodiment, the number of the input terminal of setting circuit 22 is two, output end and the setting electricity of feedback circuit 21
After the first input end connection on road 22, then it is connect with the first input end of differential amplifier circuit 24 by resistance R3；Circuit is set
After 22 the second input terminal is connect with resistance R4, then it connect with the second input terminal of differential amplifier circuit 24.The first of resistance R5
End is connect with the second input terminal of differential amplifier circuit 24, second end ground connection；The first end of resistance R6 and setting circuit 22
First input end connects, and second end is connect with the second input terminal of differential amplifier circuit 24.
Wherein, the first end of resistance R7 is connect with the first input end of setting circuit 22, second end and laser assembly 1
Temperature-control circuit 13 output end connection, to receive the feedback reference voltage of temperature-control circuit 13 detected.Specifically
For, the second end of resistance R7 is connect with the output end of temperature sensing circuit 131, to receive the detection of temperature sensing circuit 131
The feedback reference voltage arrived.The first end of resistance R7 is also connect with the first end of capacitance C1, the ground connection of the second end of capacitance C1.
Wherein, the input terminal of setting circuit 22 is connect with the output end of D/A converting circuit 33, to receive control electricity respectively
The first analog voltage V that road 3 exportsDA1With the second analog voltage VDA2, pass through the first analog voltage VDA1, the second analog voltage VDA2
And peripheral circuit setting is input to the setting voltage of differential amplifier circuit 24.
Further, in the present embodiment, the number of power amplification circuit 25 is two, realizes two power amplification circuits 25
Error signal is amplified by the bridge-type series connection amplifying circuit of composition after-applied to be fed back at the both ends of TEC132, and by two-way
Resistance switches TEC132 heating or corresponding sense of current of freezing.Specifically, the input terminal of the first power amplification circuit 251
It is connect with the output end of differential amplifier circuit 24, output end is connect with TEC132；First power amplification circuit 251 and difference are put
The big composition of circuit 24 series connection PI circuits, realize temperature precisely and the function of continuous tuning.One end of feedback resistance R8 and PI circuits
Connection, the other end are connect with the input terminal of the second power amplification circuit 252；The output end of second power amplification circuit 252 is also
It is connect with TEC132, and also bridging has feedback resistance R9 between the input terminal and output end of the second power amplification circuit 252.The
The offset side of one power amplification circuit 251 and the second power amplification circuit 252 also with external reference voltage VBenchmarkConnection, due to anti-
The difference result of feedthrough voltage and setting voltage may be negative value, pass through the reference voltage VBenchmarkIt is biased, negative value can be carried out
Compensation.In practical application scene, according to the direction of difference result switching electric current, and then TEC132 heating or refrigeration are controlled, with
Adjust the operating temperature of laser 12.
Below the principle that compensation circuit 23 compensates error caused by temperature drift is illustrated according to Fig. 2.
The equivalent resistance of compensation circuit 23 is that R' meets following formula (1)：
The feedback voltage V that the first input end of differential amplifier circuit 24 receivesFBMeet following formula (2)：
Wherein, VrefFor the thermistor R in temperature sensing circuit 131TH1The reference voltage detected, RTH1It is examined for temperature
Thermistor R in slowdown monitoring circuit 131TH1Resistance value, VDA1For the first analog voltage of the output of D/A converting circuit 33.
The feedback voltage V that second input terminal of differential amplifier circuit 24 receivesSETMeet following formula (3)：
Wherein, VDA1For the first analog voltage of the output of D/A converting circuit 33, VDA2For the defeated of D/A converting circuit 33
The second analog voltage gone out.
In actual use process, when working at high or low temperatures due to differential amplifier circuit 24, there can be tens mW
The temperature of static error, the temperature and setting that can so lead to 13 actual lock of temperature-control circuit of laser assembly 1 exists
Offset, and this offset will influence laser 12 operating temperature cause laser 12 export power and calibration power not
It is consistent, while the wavelength for also resulting in the output of laser 12 has drift, aforementioned two indexs influence whether the property of optical module
Energy.
Specifically, when ambient temperature rises, since the static error of differential amplifier circuit 24 leads to the reality of laser
Border temperature reduces, since the temperature sensing resistance inside laser is the thermistor R of negative temperature coefficientTH1, when the temperature decreases
Its resistance value becomes larger, and the reference voltage of the output of temperature sensing circuit 131 is thermistor RTH1With external stability precision resistance
The partial pressure value of Rref (resistance value is about 10K), the reference voltage V exported so as to cause temperature sensing circuit 131refBecome larger, by formula
(2) feedback voltage V known toFBBecome larger.12 operating temperature of laser caused by static error in order to eliminate differential amplifier circuit 24
Change, in the present embodiment introduce compensation circuit 23, effectively static error can be compensated by compensation circuit 23,
To offset the static error of differential amplifier circuit 24.
Specific compensation way is as follows：
When ambient temperature rises, the resistance value of the thermistor of compensation circuit 23 becomes smaller, and is mended known to upper formula (1)
The equivalent resistance for repaying circuit 23 is that R' also becomes smaller.Since equivalent resistance R' becomes smaller, the setting voltage V known to above-mentioned formula (3)SET
Also can reduce.The voltage at 24 both ends of differential amplifier circuit is close to consistent (feedback voltage V when due to, 12 steady operation of laserFBWith
Voltage V is setSETSubstantially close to consistent), as setting voltage VSETWhen reduction, the feedback voltage V after overregulatingFBAlso will reduce, directly
To setting voltage VSETWith feedback voltage VFBIt is almost the same, to offset differential amplifier circuit 24 static error of itself, drop significantly
The drift of low optical module 12 operating temperature of laser at high operating temperatures.
Specifically, when ambient temperature declines, since the static error of differential amplifier circuit 24 leads to the reality of laser
Border temperature increases, when the temperature increases the thermistor R inside laserTH1Resistance value becomes smaller, so as to cause temperature sensing circuit
The reference voltage V of 131 outputsrefBecome smaller, the feedback voltage V known to formula (2)FBBecome smaller.In order to eliminate differential amplifier circuit 24
The change of 12 operating temperature of laser caused by static error introduces compensation circuit 23 in the present embodiment, by compensating electricity
Road 23 can effectively compensate static error, to offset the static error of differential amplifier circuit 24.
Specific compensation way is as follows：
When ambient temperature declines, the resistance value of the thermistor of compensation circuit 23 becomes larger, and is mended known to upper formula (1)
The equivalent resistance for repaying circuit 23 also becomes larger for R'.Since equivalent resistance R' becomes larger, the setting voltage V known to above-mentioned formula (3)SET
Also can become larger.The voltage at 24 both ends of differential amplifier circuit is close to consistent (feedback voltage V when due to, 12 steady operation of laserFBWith
Voltage V is setSETSubstantially close to consistent), as setting voltage VSETWhen becoming larger, the feedback voltage V after overregulatingFBAlso will become larger, from
And differential amplifier circuit 24 static error of itself is offset, it greatly reduces optical module laser 12 under low-temperature condition and works temperature
The drift of degree.
The particular circuit configurations that current driving circuit 4 is illustrated with reference to Fig. 3, about the connection between each component
Relationship specifically asks Fig. 3, and a function for the circuit of component composition is mainly explained below.
Wherein, resistance R11 and capacitance C2 form low-pass first order filter, with the drive for inhibiting D/A converting circuit 33 to export
Dynamic voltage VDA3Low-frequency noise signal, the value range of resistance R11 can be 10K Ω~100K Ω, and the magnitude of capacitance C2 is
UF grades, the size of resistance R11 and capacitance C2 can be designed according to the frequency range of actual noise.Diode D1 is used for driving
Dynamic voltage VDA3Quickly release.
Resistance R12, resistance R13, resistance R14, capacitance C3, capacitance C6 and operational amplifier U1AForm second order Butterworth
Low-pass filter further decreases driving voltage VDA3Noise, and limit driving voltage VDA3Noise bandwidth.Capacitance C4 and electricity
Hold C5 to be used to decouple the power Vcc of amplifier, to ensure that power supply noise is not introduced in operational amplifier U1AIn.
Wherein, the filter circuit 41 in Fig. 1 includes the low-pass first order filter of resistance R11 and capacitance C2 compositions, Yi Ji electricity
Hinder R12, resistance R13, resistance R14, capacitance C3, capacitance C6 and operational amplifier U1AThe second order Butterworth low pass wave of composition
Device.
Resistance R15, capacitance C7, operational amplifier U1B, capacitance C8, resistance R16, resistance R17 and metal-oxide-semiconductor Q1 form Fig. 1
In current setting circuit 42, wherein resistance R17 be power resistor.In the present embodiment, metal-oxide-semiconductor Q1 is operated in linear work
Make area, due to operational amplifier U1BLoad capacity it is relatively low, and laser 12 needs great operating current (such as 100mA),
The load capacity of current setting circuit 42 can be improved by metal-oxide-semiconductor Q1.In other embodiments, MOS pipes Q1 can also be by
Triode substitutes, and can be designed according to actual conditions.
The low-pass filter of capacitance C9 and inductance L1 composition lasers 12, in order to ensure the stability of the work of laser 12,
At the both ends of laser 12 and it is provided with auxiliary circuit 121, which realizes the function of overvoltage protection and delay startup.
In the present embodiment, operational amplifier U1AWith operational amplifier U1BIt is integrated in together, in other embodiment
In, operational amplifier U1AWith operational amplifier U1BIt may be mutually independent module, can be designed according to actual conditions.Its
In, operational amplifier U1AIt is only used for forming Butterworth LPF, without to driving voltage VDA3It is amplified, operation is put
Big device U1BAnd actual conditions are to driving voltage VDA3It is amplified, amplified driving voltage VDA3Ratio with resistance R17 is
For the DC current at 12 both ends of laser.
Wherein, driving voltage VDA3Occurrence be the backlight voltage fed back according to pre-amplification circuit 5 by control circuit 3
It adjusts in real time, then correspondingly, the DC current at 12 both ends of laser can be adjusted according to actual conditions, and then ensure laser
12 transmission power meet demand.
In the present embodiment, using multi-stage filter circuit 41 to driving voltage VDA3It is filtered, can substantially reduce sharp
The high-frequency current noise that light device 12 exports, while the problem of can be broadened to avoid 12 line width of laser caused by driving circuit.
The aforementioned circuit structure diagram for specifically illustrating setting 12 DC current of laser, also needs in practical application scene
Apply the modulated signal of low frequency to laser 12.Swashing currently, the modulated signal of extraneous input needs to reload after treatment
The both ends of light device 12, wherein modulated signal is generally generated by external DAC digital conversions, in order to realize big resolution ratio, modulation
Signal amplitude is all larger, usually ranging from 2V~4V.Before modulated signal is loaded into laser 12, need to modulated signal
Amplitude is handled, and modulated signal by a small margin is converted to.Since modulated signal is generally bipolar signal, conventional scheme at present
The processing of bipolar signal is completed using the amplifier of positive-negative power power supply, but since input power is positive supply, needs to lead to
A reversed DC/DC conversion or reversed charge pump are crossed to obtain negative supply, and during generating negative supply, can be introduced larger
Noise, and then influence laser 12 performance.
In order to reduce noise, the present embodiment is realized by the way of the power supply of single positive supply to bipolar modulation signal width
The adjusting of degree.The circuit structure of the corresponding modulate circuit of modulated signal 43 is specifically described below, please continue to refer to Fig. 3, conditioning electricity
Road 43 includes circuit R18, resistance R19, capacitance C10, adder 431, resistance R20, resistance R21, resistance R22, capacitance C11, electricity
Hold C12, capacitance C13, capacitance C14, operational amplifier U2A, resistance R23, resistance R24, capacitance C15, resistance R25 and adjustable
Potentiometer T1.Connection relation about each component is please referred to such as 3, and details are not described herein.
Ambipolar modulated signal after resistance R19 and capacitance C10 AC coupleds with additional bias voltage VBiasingBy
Unipolar modulated signal is converted to after adder 431.Unipolar modulated signal passes through resistance R20, resistance R21, resistance
R22, capacitance C11, capacitance C14 and operational amplifier U2AThe second order Butterworth LPF of composition is to reduce grass
It is wide.Capacitance C12 and capacitance C13 is used to decouple the power Vcc of amplifier, to ensure that power supply noise is not introduced in operational amplifier
U2AIn.
Further, modulate circuit 43 is connect with current setting circuit 42, specifically, resistance R25 and operational amplifier
U1BOne end connection so that the modulated signal after filtering passes through operational amplifier U1BIt is loaded on laser 12.
In the present embodiment, bipolar modulation signal is converted into unipolar modulated signal, without introducing DC/DC voltages
Conversion circuit obtains negative power signal, so as to avoid the generation of noise, improves the performance of laser 12.
Optical module in the present embodiment has lower phase noise and narrower spectral line width compared with the existing technology,
And influence of the external environment variation to the transmission power of laser 12 is reduced using the method for closed loop thermal compensation, to improve
The performance of optical module.
Inventor has carried out a large amount of experiments have shown that the optical module of the present invention has more preferably performance relative to conventional scheme,
Specific experimental data such as Fig. 4~Fig. 5.
Wherein, in Fig. 4, curve 41 is the phase noise test curve of conventional scheme in the prior art, and curve 42 is this
The phase noise test curve of scheme of the invention.In Figure 5, curve 51 is that the frequency noise test of conventional scheme in the prior art is bent
Line, curve 42 are the frequency noise test curve of the present invention program.
Fig. 4 and the comparing result of test curve illustrated in fig. 5 based on test condition it is consistent, specially：Laser 12
Wavelength is 1550nm, and 12 Output optical power of laser is 10dBm, and the driving current of laser 12 is 180mA, 12 work of laser
It is 25 DEG C to make temperature, and the environment temperature of optical module test is 22 DEG C.
The key parameter setting of the driving circuit of the present invention：Current driving circuit 4 introduces second order Butterworth low pass wave
It is 1KHz that device, which mainly inhibits DC driven noise bandwidth when 12 quiescent operation of laser, 3dB cutoff frequencies,；Consider laser
The time of integration t value range of 12 temperature control stability of device and stabilization time, 12 temperature control PI parameters of laser are 1s~10s；Conditioning
Ac-coupled circuit parameter need to be determined according to the frequency fs of input signal in circuit 43, while the second order Butterworth introduced is low
Bandpass filter need to consider to inhibit noise bandwidth but significantly decaying input signal amplitude the two conditions, its usual 3dB
Cutoff frequency value range is fs-2fs.12 noise power spectrum low-frequency range of usual laser is 1/f noise, when optical module is applied to
When in hydrophone system, it is generally concerned with the numerical value of the two assigned frequency points of 20Hz and 200Hz, it is desirable that 20Hz frequency spot noise numbers
Value is less than 40,200Hz Frequency point noise figures and is less than 8.As shown in figure 4, the solution of the present invention can meet hydrophone system pair
The requirement of optical module.
When optical module is applied in hydrophone system, it is desirable that linewidth requirements are less than 3KHz, and the height of power spectrum high band
The size of frequency white noise determines the line width of 12 output spectrum of laser.The line width of 12 output spectrum of laser specifically calculates public affairs
Formula=π × PASE_PSD, PASE_PSDFrequency noise numerical value for frequency noise in high frequency flat region as can be seen from Figure 5 uses this
After the design of scheme of the invention, the line width of 12 output spectrum of laser is satisfied by hydrophone requirement.
In addition, in figure 6, curve 61 is the temperature-compensating test curve of uncompensated circuit 23, curve 62 is uncompensated electricity
The temperature-compensating test curve on road 23.It can be seen that according to the comparing result in Fig. 6 after increasing compensation circuit 23, laser 12
The drift of operating temperature point improves significantly.
It is different from the prior art, driving circuit of the invention includes temperature regulation circuit, which includes anti-
Current feed circuit, setting circuit, compensation circuit and differential amplifier circuit；Compensation circuit is used to adjust setting circuit according to environment temperature
It is input to the voltage value of differential amplifier circuit, to control temperature-control circuit heating or refrigeration, to which feedback circuit inputs
To the voltage value of differential amplifier circuit.To achieve the effect that compensate to temperature drift caused by environment temperature, laser is improved
The stability of the temperature-control circuit of component, and then improve the performance of optical module.
As it will be easily appreciated by one skilled in the art that the foregoing is merely illustrative of the preferred embodiments of the present invention, not to
The limitation present invention, all within the spirits and principles of the present invention made by all any modification, equivalent and improvement etc., should all include
Within protection scope of the present invention.
Claims (10)
1. a kind of driving circuit, which is characterized in that including：Temperature regulation circuit (2), the temperature regulation circuit (2) include anti-
Current feed circuit (21), setting circuit (22), compensation circuit (23) and differential amplifier circuit (24)；
The first input end of the differential amplifier circuit (24) is connect with the output end of the feedback circuit (21), the second input
The output end with the setting circuit (22) is held to connect, the temperature-control circuit (13) of output end and laser assembly (1) connects
It connects；
The output end of the setting circuit (22) is also connect with the compensation circuit (23)；
The compensation circuit (23), which is used to adjust the setting circuit (22) according to environment temperature, is input to the differential amplification electricity
The voltage value on road (24), to control the temperature-control circuit (13) heating or refrigeration, to adjust the feedback circuit (21)
It is input to the voltage value of the differential amplifier circuit (24).
2. driving circuit according to claim 1, which is characterized in that the compensation circuit (23) include thermistor Rth,
Resistance R1 and resistance R2；
The first end of the resistance R1 is connect with the second input terminal of the differential amplifier circuit (24), second end and the heat
The first end of quick resistance Rth connects, the second end ground connection of the thermistor Rth；
The first end of the resistance R2 is connect with the second input terminal of the differential amplifier circuit (24), second end ground connection.
3. driving circuit according to claim 2, which is characterized in that the setting circuit (22) includes resistance R3, resistance
R4, resistance R5 and resistance R6；The number of the input terminal of the setting circuit (22) is two, the output of the feedback circuit (21)
After holding the first input end with the setting circuit (22) to connect, then pass through the resistance R3 and the differential amplifier circuit (24)
First input end connection；
It is described setting circuit (22) the second input terminal connect with the resistance R4 after, then with the differential amplifier circuit (24)
Second input terminal connects；The first end of the resistance R5 is connect with the second input terminal of the differential amplifier circuit (24), the
Two ends are grounded；
The first end of the resistance R6 is connect with the first input end of the setting circuit (22), and second end is put with the difference
The second input terminal connection of big circuit (24).
4. driving circuit according to claim 3, which is characterized in that the feedback circuit (21) includes resistance R7 and capacitance
C1；
The first end of the resistance R7 is connect with the first input end of the setting circuit (22), second end and the laser
The output end of the temperature-control circuit (13) of component (1) connects, anti-to receive detecting for the temperature-control circuit (13)
Present reference voltage；
The first end of the resistance R7 is also connect with the first end of the capacitance C1, the ground connection of the second end of the capacitance C1.
5. driving circuit according to claim 1, which is characterized in that the driving circuit further includes pre-amplification circuit
(5) and control circuit (3)；
The input terminal of the pre-amplification circuit (5) is connect with the optical detector (11) of the laser assembly (1), output end
It is connect with the input terminal of the control circuit (3), the input of the output end of the control circuit (3) and the setting circuit (22)
End connection；
The control circuit (3) is used to be arranged to the setting circuit according to the monitoring result of the pre-amplification circuit (5)
(22) voltage value exported.
6. driving circuit according to claim 5, which is characterized in that the input terminal of the control circuit (3) also with it is described
The temperature-control circuit (13) of laser assembly (1) connects；
The control circuit (3) is used for the feedback temperature according to the temperature-control circuit (13) and the pre-amplification circuit
(5) voltage value exported to the setting circuit (22) is arranged in monitoring result.
7. driving circuit according to claim 5, which is characterized in that the driving circuit further includes current driving circuit
(4)；The input terminal of the current driving circuit (4) is connect with the output end of the control circuit (3), and output end swashs with described
Light device (12) connects.
8. driving circuit according to claim 7, which is characterized in that the current driving circuit (4) includes filter circuit
(41), current setting circuit (42) and modulate circuit (43)；
The input terminal of the filter circuit (41) is connect with the output end of the control circuit (3), output end and the electric current
Circuit (42) input terminal is arranged to connect；
The first input end of the modulate circuit (43) connects DC offset voltage, and the second input terminal connects modulated signal,
Output end is connect with the input terminal of the current setting circuit (42).
9. driving circuit according to claim 5, which is characterized in that the control circuit (3) includes analog to digital conversion circuit
(31), controller (32) and D/A converting circuit (33)；
The input terminal of analog-digital conversion circuit as described (31) is connect with the output end of the pre-amplification circuit (5), output end with
The input terminal of the controller (32) connects；
The output end of the controller (32) is connect with the input terminal of the D/A converting circuit (33), the D/A converting circuit
(33) output end is connect with the input terminal of the setting circuit (22).
10. a kind of optical module, which is characterized in that the optical module includes laser assembly (1) and such as claim 1~9 times
Driving circuit described in one；The output end of the laser assembly (1) and the differential amplifier circuit (24) of the driving circuit
Connection.
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| CN201810876867.1A CN108808437B (en) | 2018-08-03 | 2018-08-03 | Drive circuit and optical module using same |
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|---|---|---|---|
| CN201810876867.1A CN108808437B (en) | 2018-08-03 | 2018-08-03 | Drive circuit and optical module using same |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109708741A (en) * | 2018-12-04 | 2019-05-03 | 中船重工海声科技有限公司 | A kind of hydrophone pre-amplification circuit suitable for extensive basic matrix signal system |
| CN109974889A (en) * | 2019-03-19 | 2019-07-05 | 江苏亮点光电科技有限公司 | A kind of driving device applied to light source in distribution type laser temp measuring system |
| CN110502047A (en) * | 2019-08-29 | 2019-11-26 | 苏州邈航科技有限公司 | Laser Control System and its temperature demodulation method based on AC temperature-control |
| CN110600992A (en) * | 2019-09-12 | 2019-12-20 | 武汉光迅科技股份有限公司 | Piezoelectric ceramic shearing sheet driving circuit and laser system |
| CN112198746A (en) * | 2019-07-08 | 2021-01-08 | 深圳市Tcl高新技术开发有限公司 | Laser light source drive circuit and system |
| CN113741590A (en) * | 2021-09-09 | 2021-12-03 | 江苏奥雷光电有限公司 | Silicon optical micro-ring wavelength calibration and locking control method |
| WO2022198758A1 (en) * | 2021-03-22 | 2022-09-29 | 武汉光迅科技股份有限公司 | Method and apparatus for controlling wavelength of optical module, and storage medium |
| CN116316046A (en) * | 2023-05-16 | 2023-06-23 | 深圳市飞思卓科技有限公司 | Optical module adjusting system, method, terminal device and computer readable storage medium |
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| CN113741590A (en) * | 2021-09-09 | 2021-12-03 | 江苏奥雷光电有限公司 | Silicon optical micro-ring wavelength calibration and locking control method |
| CN116316046A (en) * | 2023-05-16 | 2023-06-23 | 深圳市飞思卓科技有限公司 | Optical module adjusting system, method, terminal device and computer readable storage medium |
| CN116316046B (en) * | 2023-05-16 | 2023-08-11 | 深圳市飞思卓科技有限公司 | Optical module adjusting system, method, terminal device and computer readable storage medium |
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