CN208637791U - For directly adjusting the temperature-compensation circuit of laser driver - Google Patents
For directly adjusting the temperature-compensation circuit of laser driver Download PDFInfo
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- CN208637791U CN208637791U CN201821339428.9U CN201821339428U CN208637791U CN 208637791 U CN208637791 U CN 208637791U CN 201821339428 U CN201821339428 U CN 201821339428U CN 208637791 U CN208637791 U CN 208637791U
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Abstract
The utility model discloses a kind of for directly adjusting the temperature-compensation circuit of laser driver, the size that the starting operating temperature of present real-time temperature and laser based on laser compensates come temperature；Including ring oscillator, frequency-digital quantizer, slope setting module, power control unit and digital-analog convertor, the output end of ring oscillator is connect with frequency-digital quantizer input terminal, the output end of frequency-digital quantizer output end and slope setting module is connect with the input terminal of power control unit, the output end of power control unit and the input terminal of digital-analog convertor connect, and the output end of digital-analog convertor and the current output module of laser driver connect.The temperature-compensation circuit of the utility model, the size that the starting operating temperature of present real-time temperature and laser based on laser compensates come temperature, it can be improved the accuracy and precision of temperature-compensating, flexible and convenient carries out temperature-compensating to the straight bias current for adjusting laser driver and modulation electric current, while reducing the complexity and area occupied of circuit design.
Description
Technical field
The utility model relates to a kind of temperature-compensation circuits, and in particular to a kind of temperature for directly adjusting laser driver is mended
Repay circuit.
Background technique
In optical communication system, laser driver and laser diode are the important components of optical sender.Laser Driven
The effect of device specifically includes that the data voltage signal of input is converted into modulated current signal by (1), and drives laser diode；
(2) bias current is provided for laser diode, makes laser diode work near threshold current.
Since laser diode is more sensitive to temperature, Output optical power varies with temperature very big.As shown in Figure 1, working as
When laser diode work is under the conditions of different temperature, electro-optical efficiency, the threshold current of laser diode all become
Change.As temperature increases, the electro-optical efficiency decline of laser diode, threshold current increase.In optical communication system, it is desirable that
Average light power and extinction ratio of the laser diode work within the temperature range of -40 DEG C~85 DEG C keep stablizing.Therefore, it is necessary to
Automated power circuit (APC loop) controls to adjust the bias current size of laser driver and modulation size of current.
Currently, being applied to the technology of laser driver temperature-compensating mainly has active refrigeration and chip interior temperature-compensating.
Active refrigeration needs to carry out Physical temperature-lowering to optical sender using extraneous refrigeration system.Chip interior temperature-compensating, i.e., in chip
Interior design temperature-compensation circuit carries out temperature-compensating to the modulation electric current and bias current of laser driver.Active refrigeration scheme
It can stand and occupy bigger area, consume additional energy, present temperature-compensating mode tends to chip interior temperature-compensating.
In practical applications, when the laser diode temperature characteristic difference of use, the size of current for needing to compensate is not yet
It is identical to the greatest extent, therefore temperature-compensation circuit is also required to change.Current most of temperature-compensation circuits lack flexibility, the temperature provided
It is smaller to spend penalty coefficient range, causes the adaptability of temperature-compensation circuit poor.In addition, existing on piece temperature-compensation circuit is logical
It is realized frequently with analog circuit, it is desirable that the circuits such as operational amplifier, band-gap reference circuit, circuit design is complex, occupies face
Product is big.
Summary of the invention
The technical problem to be solved by the present invention is to provide a kind of for directly adjusting the temperature-compensation circuit of laser driver,
The bias current to straight tune laser driver that can not only be flexible and convenient carries out temperature-compensating with modulation electric current, while reducing electricity
The complexity and area occupied of road design.
In order to solve the above-mentioned technical problem, the utility model provides a kind of for directly adjusting the temperature-compensating of laser driver
Circuit, the laser driver for driving laser, present real-time temperature of the temperature-compensation circuit based on laser and
The starting operating temperature of laser carrys out the size of temperature compensation.
It further comprise the temperature-compensation circuit and individual laser package one in one preferred embodiment of the utility model
Rise, the temperature-compensation circuit includes ring oscillator, the ring oscillator its be used for generate it is currently warm with the laser
Spend relevant working frequency.
It further comprise the temperature-compensation circuit further include frequency-number in one preferred embodiment of the utility model
Converter, slope setting module, power control unit and digital-analog convertor, the output end and frequency of the ring oscillator
The connection of rate-digital quantizer input terminal, the output end of frequency-digital quantizer output end and slope setting module is and function
The input terminal of rate control unit connects, and the output end of the power control unit and the input terminal of digital-analog convertor connect,
The output end of the digital-analog convertor and the current output module of laser driver connect；
The working frequency that ring oscillator exports is converted into and laser Current Temperatures phase by the frequency-digital quantizer
The digital signal CNT of pass；
The slope setting module is for generating gain-adjusted signal, based on the gain-adjusted signal come temperature benefit
The slope repaid；
The power control unit weights digital signal CNT using gain-adjusted signal, generates for temperature-compensating
Digital signal D；
The digital-analog convertor is compensation voltage signal for conversion digital signal D, and the compensation voltage signal is used
In the modulation electric current or/and bias current of control laser driver current output module.
It further comprise the frequency-digital quantizer in certain reference in one preferred embodiment of the utility model
It is interior that ring oscillator output signal rising edge is counted, the working frequency of ring oscillator is subjected to digital quantization, it is defeated
The digital signal CNT out.
It further comprise the power control unit include look-up table and number in one preferred embodiment of the utility model
Gain amplifier；CNT generates digital signal D0 to the look-up table according to the digital signal, includes in the digital signal D0
Initial temperature for temperature-compensating；The digital gain amplifier weights digital signal D0 using gain-adjusted signal, produces
The raw digital signal D1 and digital signal D2 for being used for temperature-compensating.
It further comprise the digital-analog convertor include digital-to-analog in one preferred embodiment of the utility model
Converter one and digital-analog convertor two, the input terminal of the digital-analog convertor one and digital-analog convertor two
It is connect with the output end of power control unit, the output end and laser driver current of the digital-analog convertor one are defeated
The tail current source connection of module out, output end and the laser driver current output module of the digital-analog convertor two
Bias current connection.
It further comprise the digital-analog convertor one for converting number in one preferred embodiment of the utility model
Word signal D1 is temperature-compensated voltage V1, and the temperature-compensated voltage V1 is used to control the tail of laser driver current output module
Electric current；The digital-analog convertor two is temperature-compensated voltage V2, the temperature-compensated voltage for conversion digital signal D2
V2 is used to control the bias current of laser driver current output module.
In one preferred embodiment of the utility model, it is multiple successively cascade to further comprise that the ring oscillator includes
Phase inverter.
It further comprise the phase inverter include PMOS tube and NMOS tube in one preferred embodiment of the utility model,
The grid of PMOS tube is connected with the grid of NMOS tube, and the drain electrode of PMOS tube is connected with the drain electrode of NMOS tube, and the source electrode of PMOS tube connects
The source electrode on ground, NMOS tube connects power supply.
It further comprise that the ring oscillator has at least three-level successively grade in one preferred embodiment of the utility model
The phase inverter of connection.
It further comprise the gain adjustment letter that the slope setting module generates in one preferred embodiment of the utility model
Number be digital signal.
The utility model for directly adjusting the temperature-compensation circuit of laser driver, present real-time temperature based on laser and
The starting operating temperature of laser carrys out the size of temperature compensation, and the size of temperature-compensating is according to the current real-time temperature of laser
Degree changes and changes, and can be improved the accuracy and precision of temperature-compensating, and can adapt to the temperature of different type laser diode
Spend characteristic.
On the other hand, the temperature-compensation circuit of the utility model can not only be flexible and convenient to straight laser driver of adjusting
Bias current and modulation electric current carry out temperature-compensating, while reducing the complexity and area occupied of circuit design.
Detailed description of the invention
Fig. 1 is the schematic diagram that laser diode light power-current characteristic is affected by temperature；
Fig. 2 is the schematic diagram of temperature-compensation circuit in the preferred embodiment in the utility model；
Fig. 3 is the schematic diagram of the preferred embodiment in the utility model ring oscillator；
Fig. 4 is the schematic diagram of phase inverter in the preferred embodiment in the utility model；
Fig. 5 is the schematic diagram of power control unit in the preferred embodiment in the utility model.
Specific embodiment
The utility model is described in further detail in the following with reference to the drawings and specific embodiments, so that those skilled in the art
The utility model may be better understood and can be practiced, but illustrated embodiment is not as the restriction to the utility model.
Embodiment
The present embodiment is applied in straight tune laser driver, as shown in Fig. 2, including applied to the straight temperature for adjusting laser driver
Spend compensation circuit 1, laser diode (or laser) and matched load circuit 2, laser driver current output module 3.Temperature
It spends compensation circuit 1 and generates temperature-compensated voltage V1 and temperature-compensated voltage V2, be respectively used to control laser driver current output
The tail current I of module0With bias current Ibias.Laser driver current output module 3 drives laser by the way of difference output
Diode controls tail current source I by temperature-compensated voltage V10, influence the modulation electric current I of laser drivermodSize, thus
Laser diode photoelectric conversion efficiency is influenced by temperature and is compensated；Bias current is controlled by temperature-compensated voltage V2
Ibias, the bias current size of laser driver is influenced, is mended to be influenced by temperature to laser diode threshold current
It repays.
As shown in Fig. 2, for directly adjusting the temperature-compensation circuit of laser driver, present real-time temperature based on laser and
The starting operating temperature of laser carrys out the size of temperature compensation, and the size of temperature-compensating is according to the current real-time temperature of laser
Degree changes and changes, and can be improved the accuracy and precision of temperature-compensating, and can adapt to the temperature of different type laser diode
Spend characteristic.
Specifically, temperature-compensation circuit includes ring oscillator 4, frequency-digital quantizer 5, slope setting module, power
Control unit 6, digital-analog convertor 1 and digital-analog convertor 28.Ring oscillator 4 and laser driver encapsulate
Together, the output end of ring oscillator 4 is connect with the input terminal of frequency-digital quantizer 5, frequency-digital quantizer 5 it is defeated
The output end of outlet and slope setting module is connect with the input terminal of power control unit 6, above-mentioned power control unit 6 it is defeated
Outlet is connect with the input terminal of digital-analog convertor 1 and digital-analog convertor 28, digital-analog convertor 1
The tail current I of output end and laser driver current output module0Connection, the output end and laser of digital-analog convertor 28
The bias current I of driver current output modulebiasConnection.
In the present embodiment technical solution, together with individual laser package, ring oscillator 4 is used as above-mentioned temperature-compensation circuit
Temperature detecting element, the temperature of real-time detection laser generate working frequency relevant to laser temperature.Specifically, laser
When device starts at normal temperature, 4 output services frequency f of ring oscillator0；After laser starting operation a period of time, heating temperature
It increases, at this time 4 output services frequency f of ring oscillatorT, working frequency fTIt is related to the Current Temperatures of laser.
Above-mentioned ring oscillator 4 is used as temperature detecting element, the temperature of real-time detection laser, generation and laser temperature
Relevant working frequency, specific structure are as follows:
As shown in figure 3, above-mentioned ring oscillator 4 includes at least three successively cascade phase inverters, the knot of each phase inverter
Structure is all the same, as shown in figure 4, each phase inverter includes PMOS tube 12 and NMOS tube 11, the grid and NMOS tube of PMOS tube 12
11 grid connection, the drain electrode of PMOS tube 12 are connected with the drain electrode of NMOS tube 11, the source electrode ground connection of PMOS tube 12, NMOS tube 11
Source electrode connects power supply.
The threshold voltage V of field-effect tube (NMOS tube, PMOS tube)THAnd carrier mobilityμIt is all the function of temperature, temperature
When raising, threshold voltage VTHIt increases, carrier mobilityμReduce；And the output electric current of field-effect tube (NMOS tube, PMOS tube) is
Threshold voltage VTHWith the function of carrier mobility μ, drain current can be indicated are as follows:
|ID|=| μ COXW/L[(VGS-VTH)VDS-VDS2/2]；(formula 1)
Wherein, COXFor breadth length ratio that the gate capacitance of field-effect tube, W/L are field-effect tube, VGSFor the grid source electricity of field-effect tube
Pressure, VDSFor the drain-source voltage of field-effect tube, can be seen that when the temperature increases according to formula (1), FET drain exports electric current
Reduce.In the present embodiment technical solution, ring oscillator 4 is packaged together with laser driver, and ring oscillator perceives laser
The temperature change of driver, when the temperature of laser driver increases, NMOS tube reduces node discharge electric current, PMOS tube is to node
Charging current reduces, and the phase inverter charge and discharge in ring oscillator 4 slow down, and leads to the working frequency f of ring oscillator 4VCODrop
It is low；Conversely, laser driver when the temperature drops, leading to the working frequency f of ring oscillator 4VCORise.
The above ring oscillator 4 is used as temperature detecting element, is generated according to the temperature change of laser current with laser
The working frequency f of temperature negative correlationVCO, as laser temperature increases the working frequency f of ring oscillatorVCOIt reduces.
The working frequency that ring oscillator 4 exports is converted into related to laser Current Temperatures by frequency-digital quantizer 5
Digital signal CNT, digital signal CNT characterize laser driver temperature change；Specifically, frequency-digital quantizer 5 is one
Determine to count 4 output signal rising edge of ring oscillator in the reference time, the working frequency of ring oscillator 4 is counted
Word quantization, exports above-mentioned digital signal CNT.
Slope setting module is digital signal, temperature for generating gain-adjusted signal slope, gain-adjusted signal slope
The slope slope that degree compensation circuit is compensated based on gain-adjusted signal come temperature, slope setting module is for generation and temperature
Compensate the relevant gain-adjusted signal of slope.In general, gain-adjusted signal is related to the type selecting of laser, laser is once selected
Type, slope setting module generate corresponding gain-adjusted signal；The laser of corresponding different model, slope setting module produce
Raw different gain-adjusted signal.
Above-mentioned power control unit weights digital signal CNT using gain-adjusted signal slope, generates and mends for temperature
The digital signal D repaid.Specifically, above-mentioned power control unit includes look-up table 9 and digital gain amplifier 10.Wherein, it searches
Table 9 generates digital signal D0 according to digital signal CNT, includes the initial temperature for temperature-compensating in digital signal D0；On
It states digital gain amplifier 10 and digital signal D0 is weighted using gain-adjusted signal slope, generate the number for being used for temperature-compensating
Word signal D1 and digital signal D2.
Digital signal D1 is converted to temperature-compensated voltage V1, digital-analog convertor 28 by digital-analog convertor 1
Digital signal D2 is converted into temperature-compensated voltage V2；Above-mentioned temperature-compensated voltage V1 is for controlling laser driver current output
The tail current size of module, the bias current that above-mentioned temperature-compensated voltage V2 is used to control laser driver current output module are big
It is small.
The temperature-compensation circuit of the above structure, operational process are as follows:
When laser starts at normal temperature, 4 output services frequency f of ring oscillator0；Laser starting operation a period of time
Afterwards, laser heating temperature increases, at this time 4 output services frequency f of ring oscillatorT, ring oscillator is by working frequency fTOutput
To frequency-digital quantizer, frequency-digital quantizer is by working frequency fTIt is converted into number relevant to laser Current Temperatures
Signal CNT；Slope setting module generates gain-adjusted signal slope according to the model of laser, and power control unit is on the one hand
Digital signal D0 corresponding with current digital signal CNT is found in a lookup table, on the other hand uses gain-adjusted signal slope
Digital signal D0 is weighted, the digital signal D1 and digital signal D2 for being used for temperature-compensating, two digital-analog convertors are generated
Digital signal D1 and digital signal D2 are converted into temperature-compensated voltage V1 and temperature-compensated voltage V2 respectively, are respectively used to
Control the tail current and bias current of laser driver current output module.Tail current source is controlled by temperature-compensated voltage V1
I0, influence the modulation electric current I of laser drivermodSize, thus to laser diode photoelectric conversion efficiency be influenced by temperature into
Row compensation；Bias current I is controlled by temperature-compensated voltage V2bias, the bias current size of laser driver is influenced, thus right
Laser diode threshold current, which is influenced by temperature, to be compensated
The temperature-compensation circuit of the utility model compared with prior art the advantages of and good effect are as follows:
1, when the temperature change of laser driver, modulation electric current that the utility model can flexibly to laser driver
It is compensated with bias current, the optical signal for exporting laser diode has stable extinction ratio and threshold current.
2, the compensation by the adjustable laser diode temperature compensation of the gain-adjusted signal slope of outside control is oblique
Rate adapts to the temperature characterisitic of different type laser diode.
3, the utility model structure is simple, is realized using digital circuit mode, is suitble to carry out on piece collection using CMOS technology
At.
Embodiment described above is only preferred embodiments for fully illustrating the utility model, the utility model
Protection scope it is without being limited thereto.Those skilled in the art made equivalent substitute or change on the basis of the utility model
It changes, both is within the protection scope of the present invention.The protection scope of the utility model is subject to claims.
Claims (10)
1. a kind of for directly adjusting the temperature-compensation circuit of laser driver, the laser driver is special for driving laser
Sign is: the temperature-compensation circuit determines temperature based on the starting operating temperature of the present real-time temperature of laser and laser
Spend the size of compensation.
2. as described in claim 1 for directly adjusting the temperature-compensation circuit of laser driver, it is characterised in that: the temperature is mended
Circuit is repaid together with individual laser package, the temperature-compensation circuit includes ring oscillator, and the ring oscillator is for producing
Raw working frequency relevant to the laser Current Temperatures.
3. as claimed in claim 2 for directly adjusting the temperature-compensation circuit of laser driver, it is characterised in that: the temperature is mended
Repaying circuit further includes frequency-digital quantizer, slope setting module, power control unit and digital-analog convertor, the ring
The output end of shape oscillator is connect with frequency-digital quantizer input terminal, and frequency-digital quantizer output end and slope are set
The output end of cover half block is connect with the input terminal of power control unit, the output end and number-mould of the power control unit
The input terminal connection of quasi- converter, the output end of the digital-analog convertor and the current output module of laser driver connect
It connects；
The working frequency that ring oscillator exports is converted into relevant to laser Current Temperatures by the frequency-digital quantizer
Digital signal CNT；
The slope setting module is compensated for generating gain-adjusted signal based on the gain-adjusted signal come temperature
Slope；
The power control unit weights digital signal CNT using gain-adjusted signal, generates the number for being used for temperature-compensating
Signal D；
The digital-analog convertor is compensation voltage signal for conversion digital signal D, and the compensation voltage signal is for controlling
The modulation electric current or/and bias current of laser driver current output module processed.
4. as claimed in claim 3 for directly adjusting the temperature-compensation circuit of laser driver, it is characterised in that: the frequency-
Digital quantizer counts ring oscillator output signal rising edge within certain reference time, by the work of ring oscillator
Working frequency carries out digital quantization, exports the digital signal CNT.
5. as claimed in claim 3 for directly adjusting the temperature-compensation circuit of laser driver, it is characterised in that: the power control
Unit processed includes look-up table and digital gain amplifier；CNT generates digital signal D0 to the look-up table according to the digital signal,
It include the initial temperature for temperature-compensating in the digital signal D0；The digital gain amplifier is believed using gain adjustment
Number to digital signal D0 weight, generate be used for temperature-compensating digital signal D1 and digital signal D2.
6. as claimed in claim 3 for directly adjusting the temperature-compensation circuit of laser driver, it is characterised in that: the number-
Analog converter includes digital-analog convertor one and digital-analog convertor two, one sum number of digital-analog convertor
The input terminal of analog-to-digital converter two is connect with the output end of power control unit, the digital-analog convertor one it is defeated
Outlet is connect with the tail current source of laser driver current output module, the output end of the digital-analog convertor two and swash
The bias current of CD-ROM driver current output module connects.
7. as claimed in claim 6 for directly adjusting the temperature-compensation circuit of laser driver, it is characterised in that: the number-
Analog converter one is temperature-compensated voltage V1 for conversion digital signal D1, and the temperature-compensated voltage V1 is for controlling laser
The tail current of driver current output module；The digital-analog convertor two is temperature-compensating for conversion digital signal D2
Voltage V2, the temperature-compensated voltage V2 are used to control the bias current of laser driver current output module.
8. as claimed in claim 2 for directly adjusting the temperature-compensation circuit of laser driver, it is characterised in that: the annular vibration
Swinging device includes multiple successively cascade phase inverters.
9. as claimed in claim 8 for directly adjusting the temperature-compensation circuit of laser driver, it is characterised in that: the phase inverter
Including PMOS tube and NMOS tube, the grid of PMOS tube is connected with the grid of NMOS tube, the drain electrode of PMOS tube and the drain electrode of NMOS tube
Connection, the source electrode ground connection of PMOS tube, the source electrode of NMOS tube connect power supply.
10. as claimed in claim 3 for directly adjusting the temperature-compensation circuit of laser driver, it is characterised in that: the slope
The gain-adjusted signal that setting module generates is digital signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821339428.9U CN208637791U (en) | 2018-08-20 | 2018-08-20 | For directly adjusting the temperature-compensation circuit of laser driver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821339428.9U CN208637791U (en) | 2018-08-20 | 2018-08-20 | For directly adjusting the temperature-compensation circuit of laser driver |
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| Publication Number | Publication Date |
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| CN208637791U true CN208637791U (en) | 2019-03-22 |
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| CN201821339428.9U Active CN208637791U (en) | 2018-08-20 | 2018-08-20 | For directly adjusting the temperature-compensation circuit of laser driver |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108711735A (en) * | 2018-08-20 | 2018-10-26 | 江苏科大亨芯半导体技术有限公司 | Temperature-compensation circuit for directly adjusting laser driver |
-
2018
- 2018-08-20 CN CN201821339428.9U patent/CN208637791U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108711735A (en) * | 2018-08-20 | 2018-10-26 | 江苏科大亨芯半导体技术有限公司 | Temperature-compensation circuit for directly adjusting laser driver |
| CN108711735B (en) * | 2018-08-20 | 2024-05-24 | 江苏科大亨芯半导体技术有限公司 | Temperature compensation circuit for direct-tuning laser driver |
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