CN101047299A - Wavelength control circuit for tunable laser - Google Patents
Wavelength control circuit for tunable laser Download PDFInfo
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- CN101047299A CN101047299A CN 200610066438 CN200610066438A CN101047299A CN 101047299 A CN101047299 A CN 101047299A CN 200610066438 CN200610066438 CN 200610066438 CN 200610066438 A CN200610066438 A CN 200610066438A CN 101047299 A CN101047299 A CN 101047299A
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Abstract
A wavelength control circuit used on tunable laser consists of error detection circuit, precise operation amplification circuit, PID compensation circuit, TEC controller and internal TEC component of laser. It is featured as obtaining one path output of bridge arm on said error detection circuit from voltage-division of two fixed resistances and obtaining another path output of said bridge arm from voltage-division of fixed resistance and laser thermosensitive resistance as well as from input of tunable voltage circuit.
Description
Technical field
The present invention relates to Wavelength tunable laser, be specifically related to a kind of Wavelength control circuit that is used for tunable laser.
Background technology
The appearance of tunable laser, can the minimizing system in standby quantity of light source and specification, be easy to form standardized communication system, the operation cost of system and maintenance cost can be reduced significantly.The structure of tunable laser and working mechanism change various, semiconductor tunable laser tuning has modes such as electric tuning, thermal tuning and mechanical tuning, be divided into structure such as multi-electrode in exocoel type and the chamber, the tuning common use tunable optic filter of tunable optical fiber laser is realized.Tunable laser not only can be used as the light source of dense wave division multipurpose (DWDM) system, can also be used as the packet switching device, insert lambda router etc., in optical communication, have very large application potential, finally will replace accounting on the present Communications Market fixed wave length LASER Light Source of dominant position.
Tunable Distributed Feedback Laser generally is to realize wavelength tuning by thermal tuning, but along with the rising of tuning temperature, the effective output of laser is descended, so the tuning range of single Distributed Feedback Laser is restricted.Therefore in to the not high application of tuning area requirement; become a kind of wavelength tuning mode (for example laser LC25T of the BOOKHAM of producer) of maturation by its operation wavelength of adjusting laser tube core temperature change; the die temperature of this class tunable laser product can be arranged in 8 ℃～50 ℃ the scope usually; the output wavelength that different tube cores is corresponding different, so its ability in certain wave-length coverage with continuous tuning.On the other hand since the tube core of laser that temperature range is set is bigger, in order to guarantee that laser has good temperature stabilization performance, this laser adopts advanced technology to improve the TEC refrigerating efficiency of laser usually, work as the laser tube core temperature like this and be arranged on any working point of 8 ℃～50 ℃, the CASE temperature of laser laser refrigerator when-20 ℃～70 ℃ range still can effectively be worked, and die temperature does not change with the operating ambient temperature of laser.This tunable laser mainly is to satisfy static application in dwdm system, and the output wavelength of transmitter is in use set, not time to time change.Modal static application is the substitute as the source laser device, promptly is used in the DWDM transmission system, allows a tunable laser serve as the reserve of a plurality of laser with fixed wavelength and flexible source laser device.
For dwdm system, the operation wavelength of requirement laser is stabilized in ITU-T and stipulates G.692 to be applicable to that G.652/G.655 the channel spacing of optical fiber is on the specific wavelength of 100GHz, the skew that ends of operation wavelength life-span of system requirements laser is less than ± 20GHZ, and temperature drift is less than ± 4GHz.The operation wavelength of optical transmission module in the certain environment temperature range and the module life requirement of at the end whether satisfying system applies depend on the performance of the direct modulated laser of selecting for use, the operating efficiency of for example size of the range of set value of laser tube core temperature, and laser refrigerator TEC and the design of laser internal heat dissipating etc.Use the optical sender of this tunable laser, need to use automatic temperature-adjusting control (ATC) circuit to guarantee its steady operation in dwdm system, negative tempperature coefficient thermistor RT that ATC circuit and laser are inner integrated and TEC semiconductor cooler form a feedback control loop, be used for realizing the function of High Accuracy Control laser tube core temperature, have the relation of determining between laser tube core temperature and the laser output wavelength, thereby reach the purpose of light stable wavelength.
Tunable Distributed Feedback Laser intraware comprises LD, power monitoring PIN pipe, thermistor TH and TEC refrigerator dorsad.The output wavelength of this Distributed Feedback Laser is influenced by die temperature and the operating current that flows through laser tube core mainly, wherein die temperature has decisive influence to wavelength, the laser works electric current is less relatively to wavelength affects, therefore mainly realizes controlling the purpose of laser output wavelength by control laser tube core temperature.
The structured flowchart of tradition ATC circuit as shown in Figure 1, generally this circuit is made up of the inner TEC assembly of temperature error testing circuit, error amplifying circuit, PID compensating circuit, TEC controller and laser.Laser temperature-sensitive resistance R T is used for the die temperature of Laser Measurement device, it is the part of temperature error testing circuit, error-detector circuit with laser temperature-sensitive resistance detection to die temperature make ratio with set point, error is offered the accurate operational amplification circuit of next stage.This voltage amplifies by the amplifier of a high-gain, compensate through the frequency characteristic of PID circuit more simultaneously the ATC loop, this circuit has Z1 and Z2 two cover compensating parameters, increase the stability of control circuit by adjustment, and the every index that improves this control loop reaches the requirement of system to Z1 and Z2.The output of PID circuit drives the output of TEC controller again, and the TEC controller is then controlled the size of current and the direction of the TEC assembly of laser, thereby changes the temperature of laser tube core, makes this value near set point.When the die temperature of laser was lower than set point temperatures, the TEC controller increased TEC and heats the tube core that electric current heats laser; When die temperature was higher than set point temperatures, the TEC controller can increase the tube core that TEC refrigeration electric current comes the cooling laser device.The height of laser tube core temperature feeds back to the temperature error testing circuit by laser temperature-sensitive resistance R T, and by above-mentioned feedback control procedure, the die temperature of laser will finally be stabilized in set point, thereby realizes the laser tube core temperature auto control.
When needs are adjusted the die temperature of laser, the potentiometer RX that can change among Fig. 1 realizes, RX position in the drawings is one of multiple implementation method of bridge circuit, for example RX can also with the same brachium pontis of laser temperature-sensitive resistance at electric bridge, the change of RX will cause the change of electric bridge two output end voltages, thereby cause the subsequent control circuit operation, reach new set point up to laser temperature-sensitive resistance.
For Accurate Analysis ATC circuit comparatively, with a R0=10024, the typical N TC laser temperature-sensitive resistance R T of beta=3891 is an analytic target, and Fig. 2 provides the curve that its resistance changes with ambient temperature Ts (8 ℃～50 ℃).Can analyze the problem that is run into when this traditional ATC circuit and tunable laser are used.Because it is big that the tube core of this tunable laser is provided with temperature range, thus the thermistor of laser that scope is set is corresponding also big.Usually the scope of RT is 4K Ω～20K Ω, therefore requires the resistance adjustment scope of potentiometer greater than 20K Ω.On the other hand, the degree of regulation of selected potentiometer will satisfy the requirement of dwdm system to the meticulous adjusting of wavelength, wavelength trimming precision＜the 1GHz of system requirements generally, when being 4K Ω for laser temperature-sensitive resistance R T shown in Figure 2, the resolution that calculates potentiometer RX need reach 14 Ω; And be 20K Ω for the RT resistance, the resolution that calculates potentiometer RX need reach 87 Ω.In order to guarantee laser temperature-sensitive resistance R T at each set-point degree of regulation, so the resolution of potentiometer must reach 14 Ω, and for the occasion of using digital method to realize, this just means that digital regulation resistance resolution will be above 10.Obviously when RT=20K Ω, it is less than normal that the resolution of Δ RT=14 Ω will cause regulating step-length again, regulates the problem that step number increases.
Consider the influence of the temperature characterisitic of 300ppm/ ℃ in potentiometer self to the ATC circuit at last, can see when laser temperature-sensitive resistance R T resistance is 4K Ω that ambient temperature is when changing for-15 ℃～65 ℃, Δ RX will reach 96 Ω, and this will cause that wavelength shift reaches 7G; When the RT resistance was 20K Ω, ambient temperature was when changing for-15 ℃～65 ℃, and Δ RX will reach 480 Ω, and this will cause that wavelength shift reaches 5G.
Summary of the invention
The object of the invention is to provide a kind of Wavelength control circuit that is used for tunable laser, what specifically provide is the implementation of tunable optical transmitter automatic temperature-adjusting control (ATC) circuit, resolution system is put in order the requirement of precision to optical sender big wavelength modification scope and ditty, overcome the influence of the temperature drift of circuit parameter, particularly potentiometer simultaneously to wavelength stability.
The present invention specifically is achieved in that
A kind of Wavelength control circuit that is used for tunable laser is made up of the inner TEC assembly of error-detector circuit, accurate operational amplification circuit, PID compensating circuit, TEC controller and laser;
One tunnel output of described error-detector circuit electric bridge electricity arm is obtained by two fixed resistance dividing potential drops;
It is characterized in that:
Another road output of described error-detector circuit electric bridge brachium pontis is obtained by the input of fixed resistance and laser temperature-sensitive electric resistance partial pressure and external adjustable voltage circuit.
Described external adjustable voltage circuit is made up of potentiometer, the operational amplifier that is attached thereto, the fixed resistance that links to each other with operational amplifier.
The resistance of described fixed resistance is determined according to the scope of operational amplifier output voltage.
Described external adjustable voltage circuit is made up of digital to analog converter, the operational amplifier that is attached thereto, the fixed resistance that links to each other with operational amplifier.
Described digital to analog converter resolution is not less than 10, and the resistance of described fixed resistance is determined according to the scope of operational amplifier output voltage.
Described external adjustable voltage circuit is made up of the digital to analog converter of band Gain Adjustable buffering area, the fixed resistance that is attached thereto.
Described digital to analog converter resolution is not less than 10, and the resistance of described fixed resistance is determined according to the scope of digital to analog converter output voltage.
The Wavelength control circuit that is used for tunable laser of the present invention improves the control precision of optical sender temperature-control circuit, realized big wavelength adjusting range, and taken into account little wavelength regulation precision, reduced the influence of variation of ambient temperature to the ATC circuit.Compared with prior art, optical sender Wavelength control circuit simplicity of design is efficient, has avoided the uneven problem of wavelength regulation occurring in big wavelength adjusting range, has also avoided variation of ambient temperature to cause wavelength shift to exceed the problem of index request.
In addition, circuit of the present invention can realize that therefore the adjustment of laser temperature-sensitive resistance adjusting range and adjustment precision is had very strong flexibility by the size of adjustment resistance R A and the gain of operational amplifier, changes circuit parameter and can realize different application.
Description of drawings
Fig. 1 is the structured flowchart of traditional ATC circuit;
Fig. 2 is the curve of NTC laser temperature-sensitive resistance R T resistance with variation of ambient temperature;
Fig. 3 is an ATC schematic block circuit diagram of the present invention;
Fig. 4 is that the error-detector circuit in the ATC circuit of the present invention uses 10 bit digital potentiometers to add the bridge circuit structured flowchart of amplifier output;
Fig. 5 is to use the schematic diagram of the bridge circuit RT adjusting range of the described digital regulation resistance of Fig. 4;
Fig. 6 is to use the bridge circuit RT of 10 bit digital potentiometers to adjust the schematic diagram of precision;
Fig. 7 is the bridge circuit structured flowchart that the error-detector circuit in the ATC circuit of the present invention is used 10 DAC of band BUFFER;
Fig. 8 is to use the bridge circuit RT adjusting range schematic diagram of 10 DAC of band BUFFER;
Fig. 9 is to use the bridge circuit RT of 10 DAC of band BUFFER to adjust the precision schematic diagram.
Embodiment
By the following examples the present invention is described in further detail:
ATC circuit of the present invention is compared with traditional ATC circuit, is made up of the inner TEC assembly of error-detector circuit, accurate operational amplification circuit, PID compensating circuit, TEC controller and laser equally.Except error-detector circuit was different with traditional ATC, other circuit can be identical, and its theory diagram as shown in Figure 3.Temperature error testing circuit after the improvement is replaced by fixed resistance with the potentiometer on the electric bridge brachium pontis, the electric bridge A voltage VA of ordering is obtained by two fixed resistance dividing potential drops like this, this voltage offers precision operational-amplifier as reference voltage, and at the B of electric bridge point, except fixed resistance on the electric bridge brachium pontis and laser temperature-sensitive resistance R T, potentiometer RX or DAC output voltage amplify back (DAC of band Gain Adjustable BUFFER does not then need to add operational amplifier) output through rail-to-rail operational amplifier, attach to the B point by resistance R A, so the voltage VB that B is ordered is then by a plurality of circuit parameter decisions.When the ATC circuit balancing, the difference of VB voltage and VA voltage is stable.
Embodiment 1:
With the ATC circuit in the existing 2.5Gbs tunable optical transmitter is example, utilize 10 50K digital regulation resistances to build in this circuit and be illustrated in fig. 4 shown below bridge circuit, wherein RP1 is the 50K digital regulation resistance, the digital regulation resistance two ends add the 2.5V reference voltage, the centre tap end of potentiometer links to each other with the B end of electric bridge by resistance R A through penetrating with (amplifier gain is 1) behind the operational amplifier, the resistance of RA is determined according to the scope of the output voltage of operational amplifier, according to the resistance parameter that provides among the figure, by calculating the adjusting range that can obtain this circuit RT and adjusting the following Fig. 5 of precision, shown in 6.
RP1 is the 50k digital regulation resistance, and RP1 can change in the resistance internal linear of 0～50k, and the resistance degree of regulation of RP1 is 50K/2
10=49 Ω.PIN2 and the resistance between the PIN3 of RP1 are defined as RS (K Ω), and then the resistance between PIN1 and the PIN2 is 50-RS (K Ω).
Calculated data is described as follows: the coordinate transverse axis is the different resistances (unit K Ω) of RS among Fig. 5 and 6, and Fig. 5 ordinate is represented the change in resistance of laser temperature-sensitive resistance, and on behalf of RT, the ordinate of Fig. 6 adjust the change curve of precision.For laser tube core temperature being set is 47.4 ℃ situation, thermistor is set at 4k, output frequency at this temperature spot laser changes 1GHz as previously mentioned, corresponding thermistor changes 14 Ω, can obtain RP1 by calculating and adjust the corresponding dRT (of lattice @RT=4K)=7 Ω, the adjustment of visible RP1 one lattice can cause that laser frequency changes approximate 0.5GHz; In like manner for laser tube core temperature being set is 10 ℃ situation, thermistor is set at 20k, output frequency at this temperature spot laser changes 1GHz, corresponding thermistor changes 87 Ω, can obtain RP1 by calculating and adjust the corresponding dRT (of lattice @RT=20K)=44 Ω, the adjustment of visible RP1 one lattice can cause that laser frequency changes the same 0.5GHz of being similar to; At last for laser tube core temperature being set is 25 ℃ situation, thermistor is set at 10k, output frequency at this temperature spot laser changes 1GHz, corresponding thermistor changes 41.5 Ω, can obtain RP1 by calculating and adjust the corresponding dRT (of lattice @RT=10K)=17 Ω, the adjustment of visible RP1 one lattice can cause that laser frequency changes approximate 0.5GHz.
Can obtain the influence of the temperature characterisitic of digital regulation resistance to electric bridge by calculating, it is 300ppm/ ℃ that the resistance of digital regulation resistance varies with temperature the coefficient representative value, but the temperature characterisitic of digital regulation resistance is very limited to the influence of electric bridge in the above-mentioned bridge circuit.The voltage of electric bridge VA is fixed as 1.25V, when digital regulation resistance is adjusted to two ends, the digital regulation resistance resistance varies with temperature not influence of electric bridge, when digital regulation resistance is adjusted to intermediate point, then this moment, variations in temperature can cause that the approximate geometric ratio of digital regulation resistance two parts resistance changes, so the voltage of electric bridge VB can not change because of the variations in temperature of digital regulation resistance.
Embodiment 2:
With the ATC circuit in the existing 10Gbs tunable optical transmitter is example, utilizes 10 DAC of band Gain Adjustable BUFFER in this circuit, can choose the DAC that digital-to-analogue resolution is not less than 10, builds and is illustrated in fig. 7 shown below bridge circuit, and wherein D1 is DAC.The reference voltage of DAC is set to 2.5V, the gain of its BUFFER is 1, its output directly links to each other with RA resistance, the resistance of RA is determined according to the scope of the output voltage of operational amplifier, generally the driving force of the output BUFFER amplifier in the DAC is greater than 0.2mA, and the DAC maximum output current is 0.04mA in the application below, and therefore most 10 DAC satisfy the demands.According to the resistance parameter that provides among the figure, by calculating the adjusting range that can obtain this circuit RT and adjusting shown in following Fig. 8 of precision, 9.
Fig. 7 has described the bridge circuit structure of 10 DAC that use band BUFFER, and wherein D1 is the DAC of 10bit, and the D1 output voltage changes in the scope internal linear of 0～2.5V, and the voltage regulation accuracy of D1 is 2.44mV.
Calculated data is described as follows: the coordinate transverse axis is the different voltages (V of unit) of DAC output among Fig. 8 and 9, and Fig. 8 ordinate is represented the change in resistance of laser temperature-sensitive resistance, and on behalf of RT, the ordinate of Fig. 9 adjust the change curve of precision.Obviously use the scheme of 10 DAC in full accord with the result that the scheme of using 10 bit digital potentiometers obtains, promptly Vdac adjusts the corresponding dRT (of lattice @RT=4K)=7 Ω, cause that laser frequency changes approximate 0.5GHz; RP1 adjusts the corresponding dRT (of lattice @RT=20K)=44 Ω, cause that laser frequency changes same approximate 0.5GHz; RP1 adjusts the corresponding dRT (of lattice @RT=10K)=17 Ω, cause that laser frequency changes approximate 0.5GHz.
The temperature characterisitic of DAC to the influence of electric bridge and digital regulation resistance to influence mechanism similar, so the DAC variations in temperature can not cause that the DAC output voltage changes, promptly almost to the not influence of electric bridge operating state.
Claims (7)
1, a kind of Wavelength control circuit that is used for tunable laser is made up of the inner TEC assembly of error-detector circuit, accurate operational amplification circuit, PID compensating circuit, TEC controller and laser;
One tunnel output of described error-detector circuit electric bridge electricity arm is obtained by two fixed resistance dividing potential drops;
It is characterized in that:
Another road output of described error-detector circuit electric bridge brachium pontis is obtained by the input of fixed resistance and laser temperature-sensitive electric resistance partial pressure and external adjustable voltage circuit.
2, the Wavelength control circuit that is used for tunable laser as claimed in claim 1 is characterized in that:
Described external adjustable voltage circuit is made up of potentiometer, the operational amplifier that is attached thereto, the fixed resistance that links to each other with operational amplifier.
3, the Wavelength control circuit that is used for tunable laser as claimed in claim 2 is characterized in that:
The resistance of described fixed resistance is determined according to the scope of operational amplifier output voltage.
4, the Wavelength control circuit that is used for tunable laser as claimed in claim 1 is characterized in that:
Described external adjustable voltage circuit is made up of digital to analog converter, the operational amplifier that is attached thereto, the fixed resistance that links to each other with operational amplifier.
5, the Wavelength control circuit that is used for tunable laser as claimed in claim 4 is characterized in that:
Described digital to analog converter resolution is not less than 10, and the resistance of described fixed resistance is determined according to the scope of operational amplifier output voltage.
6, the Wavelength control circuit that is used for tunable laser as claimed in claim 1 is characterized in that:
Described external adjustable voltage circuit is made up of the digital to analog converter of band Gain Adjustable buffering area, the fixed resistance that is attached thereto.
7, the Wavelength control circuit that is used for tunable laser as claimed in claim 6 is characterized in that:
Described digital to analog converter resolution is not less than 10, and the resistance of described fixed resistance is determined according to the scope of digital to analog converter output voltage.
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| CNB2006100664385A CN100472900C (en) | 2006-03-31 | 2006-03-31 | Wavelength control circuit for tunable laser |
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| CNB2006100664385A CN100472900C (en) | 2006-03-31 | 2006-03-31 | Wavelength control circuit for tunable laser |
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Cited By (9)
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| WO2010139144A1 (en) * | 2009-06-05 | 2010-12-09 | 中兴通讯股份有限公司 | Optical module and control method thereof |
| CN106656347A (en) * | 2016-12-26 | 2017-05-10 | 武汉光迅科技股份有限公司 | Method and device used for controlling wavelength of light emitting component |
| CN106953694A (en) * | 2017-01-17 | 2017-07-14 | 中航光电科技股份有限公司 | A kind of airborne compact radio frequency optical sender |
| CN107562087A (en) * | 2016-06-30 | 2018-01-09 | 南京中兴软件有限责任公司 | Temprature control method and device, optical module based on heater |
| CN108983198A (en) * | 2018-09-28 | 2018-12-11 | 昂纳信息技术（深圳）有限公司 | A kind of solid state light emitter of wavelengthtunable and a kind of laser radar |
| CN109193332A (en) * | 2018-08-24 | 2019-01-11 | 武汉光迅科技股份有限公司 | A kind of compensation method of laser output frequency and corresponding optical module |
| CN110061800A (en) * | 2019-04-18 | 2019-07-26 | 浙江省广电科技股份有限公司 | A kind of Wavelength stabilized system of tunable DWDM wavelength optical node |
| CN109193339B (en) * | 2018-10-10 | 2019-08-23 | 中国科学院合肥物质科学研究院 | A kind of adjusting method and system of laser output wavelength |
| CN111679705A (en) * | 2020-06-22 | 2020-09-18 | 索尔思光电（成都）有限公司 | Low-cost digital high-precision wavelength control circuit and method |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US5299212A (en) * | 1993-03-10 | 1994-03-29 | At&T Bell Laboratories | Article comprising a wavelength-stabilized semiconductor laser |
| JP3307346B2 (en) * | 1998-11-27 | 2002-07-24 | 日本電気株式会社 | Wavelength control circuit |
| US6516010B1 (en) * | 1999-07-13 | 2003-02-04 | Agere Systems, Inc. | Method and apparatus for active numeric temperature compensation of an etalon in a wavelength stabilized laser |
| JP3626136B2 (en) * | 2001-12-28 | 2005-03-02 | ダイトロンテクノロジー株式会社 | Method and apparatus for driving wavelength-locked LD device |
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| WO2010139144A1 (en) * | 2009-06-05 | 2010-12-09 | 中兴通讯股份有限公司 | Optical module and control method thereof |
| CN107562087A (en) * | 2016-06-30 | 2018-01-09 | 南京中兴软件有限责任公司 | Temprature control method and device, optical module based on heater |
| CN107562087B (en) * | 2016-06-30 | 2024-04-02 | 中兴通讯股份有限公司 | Temperature control method and device based on heater and optical module |
| CN106656347A (en) * | 2016-12-26 | 2017-05-10 | 武汉光迅科技股份有限公司 | Method and device used for controlling wavelength of light emitting component |
| CN106656347B (en) * | 2016-12-26 | 2019-03-19 | 武汉光迅科技股份有限公司 | It is a kind of for controlling the method and device of light emission component wavelength |
| CN106953694A (en) * | 2017-01-17 | 2017-07-14 | 中航光电科技股份有限公司 | A kind of airborne compact radio frequency optical sender |
| CN109193332A (en) * | 2018-08-24 | 2019-01-11 | 武汉光迅科技股份有限公司 | A kind of compensation method of laser output frequency and corresponding optical module |
| CN108983198A (en) * | 2018-09-28 | 2018-12-11 | 昂纳信息技术（深圳）有限公司 | A kind of solid state light emitter of wavelengthtunable and a kind of laser radar |
| CN109193339B (en) * | 2018-10-10 | 2019-08-23 | 中国科学院合肥物质科学研究院 | A kind of adjusting method and system of laser output wavelength |
| CN110061800A (en) * | 2019-04-18 | 2019-07-26 | 浙江省广电科技股份有限公司 | A kind of Wavelength stabilized system of tunable DWDM wavelength optical node |
| CN111679705A (en) * | 2020-06-22 | 2020-09-18 | 索尔思光电（成都）有限公司 | Low-cost digital high-precision wavelength control circuit and method |
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