CN103715604A - Driving system and driving method of DFB laser - Google Patents
Driving system and driving method of DFB laser Download PDFInfo
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Abstract
The invention provides a driving system of a DFB laser and a driving method using the system. A constant-temperature driving system and a constant-current driving system are respectively constructed through two integrated circuits and are connected through a main controller and a DA converter to form the driving system of the DFB laser. Driving can be realized by the steps of connecting a PC through the main controller, setting driving current and temperature of the DFB laser through the PC and transmitting an external driving instruction to the main controller. The system is a laser driving system with a high degree of integration, the system is simple and easy to debug and easy in digital control, and the flexibility and reliability of the system are greatly improved.
Description
Technical field
The present invention relates to photoelectric field, relate in particular to a kind of drive system and driving method of Distributed Feedback Laser.
Background technology
Distributed feedback laser (Distributed Feedback Laser, be called for short Distributed Feedback Laser) be the desirable direct switching device of electronics-photon, it has higher quantum efficiency, but small electric current and variations in temperature all will cause the very big variation of Output optical power.As application, require Distributed Feedback Laser should there is lower electrical noise and higher stability, because the fluctuation of drive current not only can cause laser intensity noise, also can cause the broadening of output wavelength spectral line width.Distributed Feedback Laser is as current drive-type device, and the drive current of high stability is the prerequisite of stable output power.In addition, Distributed Feedback Laser is to the very sensitive device of temperature, and the fluctuation of ambient temperature can not only cause the fluctuation of supplying with electric current, also can make the threshold current of laser and power output change.Therefore, guarantee that Distributed Feedback Laser continuous operation is at room temperature extremely important external condition.So, Distributed Feedback Laser is carried out to constant-temperature constant-current driving, for the optical fiber sensing system of application Distributed Feedback Laser, the light source of a high-quality is provided is vital.
Yet, existing Distributed Feedback Laser adopts the PID controller that discrete device is built to carry out automated power control (APC), automatic temperature-adjusting control (ATC) more, and circuit is complicated, easily makes mistakes, and pid control parameter is difficult adjustment extremely, is difficult to meet the requirement of high-precision high-reliability.
Summary of the invention
For solving the problem of prior art existence, the invention provides a kind of drive system and driving method of Distributed Feedback Laser.The method comprises:
Constant-current drive circuit and constant temperature drive circuit, couple respectively described Distributed Feedback Laser;
Master controller, in order to receive an external drive instruction to parse corresponding constant current control signal and thermostatic control signal output;
DA transducer, couple described constant-current drive circuit, constant temperature drive circuit and master controller, in order to receive described constant current control signal and the thermostatic control signal of described master controller output and to carry out DA conversion, to generate constant current, control voltage and thermostatic control voltage and export to described constant-current drive circuit and constant temperature drive circuit;
Wherein, described constant temperature drive circuit and described constant-current drive circuit all adopt monolithic integrated circuit, and the parameter of voltage and thermostatic control voltage control Distributed Feedback Laser is controlled in the constant current of exporting by DA transducer, so that the luminous power of described Distributed Feedback Laser stable output.
Further, in the drive system of described Distributed Feedback Laser, described master controller comprises constant current control table and thermostatic control table, and it parses corresponding constant current control signal and thermostatic control signal output by described constant current control table and thermostatic control table after receiving external drive instruction.
Further, in the drive system of described Distributed Feedback Laser, described constant-current drive circuit comprises a controller, in order to the Output optical power of described Distributed Feedback Laser is carried out to control and compensation, to stablize the Output optical power of described Distributed Feedback Laser.
Further, in the drive system of described Distributed Feedback Laser, described constant-current drive circuit detects the size of described Distributed Feedback Laser Output optical power, if exceed a setting threshold, described constant-current drive circuit automatically shuts down to protect described Distributed Feedback Laser.
Further; in the drive system of described Distributed Feedback Laser; described constant temperature drive circuit comprises a voltage comparator; described thermostatic control voltage is accepted in one end of described voltage comparator; the other end receives a reference voltage of setting; when described thermostatic control electric voltage exception, described voltage comparator is exported a triggering level to automatically shut down described constant-current drive circuit to protect described Distributed Feedback Laser.
The present invention also provides a kind of driving method of Distributed Feedback Laser, and the method comprises:
The master controller that connects the drive system of the Distributed Feedback Laser as described in any one in claim 1 to 5 with a PC;
According to the required drive current of described Distributed Feedback Laser and temperature, described external drive instruction is set on described PC;
By described PC, send described external drive instruction to described master controller, so that described master controller output constant current control signal and thermostatic control signal.
Further, in the drive system of described Distributed Feedback Laser, described PC carries out verification to described external drive instruction before sending described external drive instruction.
Further, in the drive system of described Distributed Feedback Laser, described PC connects the master controller of the drive system of described Distributed Feedback Laser by RS232 bus.
Constant temperature drive circuit and the constant-current drive circuit of the drive system of Distributed Feedback Laser provided by the invention all adopt monolithic integrated circuit, to build constant-temperature constant-current drive system, realize the object of the laser drive system of high integration, the drive system of described Distributed Feedback Laser is simple and be easy to debugging, and easily carry out digital controlly, greatly improved flexibility and the reliability of system.
Accompanying drawing explanation
Fig. 1 is the drive system pie graph of Distributed Feedback Laser described in the embodiment of the present invention;
Fig. 2 is the driving method flow chart of Distributed Feedback Laser described in the embodiment of the present invention.
Embodiment
As shown in Figure 1, the drive system of Distributed Feedback Laser of the present invention comprises master controller 10, DA transducer 20, constant-current drive circuit 40 and constant temperature drive circuit 50.During use, constant-current drive circuit 40 and constant temperature drive circuit 50 couple Distributed Feedback Laser 30.
Constant-current drive circuit 40 of the present invention and constant temperature drive circuit 50 all adopt monolithic integrated circuit.Described constant-current drive circuit 40 is for controlling the parameter of voltage control laser 30 with the power of control laser according to constant current.Constant-current drive circuit 40 comprises constant current control table, after constant-current drive circuit 40 receives external drive instruction, by described constant current control table, parses corresponding constant current control signal.
In constant-current drive circuit 40, comprise controller 41, in order to the Output optical power of described Distributed Feedback Laser 30 is carried out to control and compensation, to stablize the Output optical power of Distributed Feedback Laser 30.Controller 41 can be PID controller.In constant-current drive circuit 40, also can set in advance the threshold value of Distributed Feedback Laser 30 Output optical power, and automatically detect the Output optical power size of described Distributed Feedback Laser 30, if exceed described threshold value, constant-current drive circuit 40 closes to protect Distributed Feedback Laser 30 automatically.
Described constant temperature drive circuit 50 is the power with control laser according to the parameter of thermostatic control voltage control laser 30.In constant temperature drive circuit 50, comprise voltage comparator 51; one termination is subject to described thermostatic control voltage; the other end receives a reference voltage of setting; when described thermostatic control electric voltage exception, described voltage comparator 51 output one triggering levels are to automatically shut down described constant-current drive circuit 40 to protect described Distributed Feedback Laser 30.
Refer to Fig. 2, Fig. 2 is the flow chart of the driving method of Distributed Feedback Laser 30 of the present invention.First with PC, connect the master controller 10 in Distributed Feedback Laser drive system of the present invention, then according to the demand of the drive current of Distributed Feedback Laser 30 and temperature, described external drive instruction is set, then this external drive instruction sends to master controller 10, makes master controller 10 output constant current control signals and thermostatic control signal.
Adopt the attainable control function of PC to comprise: laser 30 luminous powers are set, arrange laser 30 temperature, obtain when header board carry temperature, obtain current lasers 30 drive current, turn-off laser 30 constant currents and drive, turn-off laser 30 constant temperature and drive.
The luminous power of described laser 30 and the setting of temperature are all to send instruction by serial ports, and master controller 10 is controlled DA transducer 20 output constant currents and thermostatic control voltage after receiving instruction, thereby reach, object is set.
The transmission of instruction is all by CRC check, guarantees the correctness of data, and the slave computer judgement that tries again simultaneously, to improve to greatest extent reliability, avoids sending error code lead to errors response but power or the excess Temperature of laser 30 settings.
It is also the form of instruction that sends by serial ports that described shutoff laser 30 constant currents and constant temperature drive, and flow process is the same.Obtaining plate, to carry temperature be to carry by AD sampling plate the temperature data (described plate carries temperature survey chip for simulation integrated chip, and temperature transition is become to voltage, and different voltage corresponding to temperature, has the relation of mapping one by one) that temperature survey chip obtains.
The drive current that obtains laser 30 is by the size of sampling driving voltage, to judge the size of current drive current, thus real-time monitoring laser 30, the infringement of avoiding overcurrent or overvoltage to cause laser.
Constant-current drive circuit 40 of the present invention and constant temperature drive circuit 50 all adopt monolithic integrated circuit.Preferably, can use chip ADN2841 as constant-current drive circuit 40, ADN8831 is as constant temperature drive circuit 50.
Referring to the databook of chip ADN2841, the LD of laser 30 connects the bias current control end IBIAS of chip, and the detector backlight of laser 30 connects IMPD end, and DA transducer 20 connecting laser power setting end PSET, warning arrange end ASET.Whether the test side backlight detection laser power output of chip is the value that expection arranges, and then by inner PID control circuit, carries out control and compensation, thereby makes the power output of laser 30 reach stationary value.Further, described DA transducer one end can be used for arranging the size of alarm current, sends out a pulse and carries out automatically shutting down of control chip to ALS end, thereby effectively guaranteed that in the situation of overcurrent, laser is unlikely to damage after going beyond the scope.
Databook referring to ADN8831, after the temperature value of described external drive instruction is set, temperature is controlled voltage and produce pressure reduction between THERMIN and TEMPSET, difference signal is sent into chip internal amplifier and is amplified, then by inner PID control circuit, finally the triggering signal as PWM temperature control triggers PWM work, the TEC circuit (not marking in figure) of controlling laser 30 inside carries out heating or the refrigeration of laser 30, thereby affect thermistor resistance, allow outside bridge circuit reach balance, complete temperature control control procedure.The thermostatic control voltage of DA transducer 20 outputs enters the voltage input end of ADN8831, connects one end of voltage comparator 51 inputs simultaneously, and the other end of voltage comparator 51 inputs arranges a reference voltage.When DA transducer 20 output voltages are when abnormal; comparator 51 output one triggering levels; the unlatching control end SD that this triggering level is connected to ADN8830, opens or closes thereby control it, and then has protected the TEC semiconductor cooler (not marking in figure) of Distributed Feedback Laser 30 inside.The theoretic temperature control precision of ADN8831 is 0.01 ℃, corresponding 0.01 ℃ of the every 250 μ V of difference voltage of 2,4 pins.The output voltage of DA transducer 20 and the relational expression between set temperature are TEMPSET=-0.025 (T-25)+1.397, the temperature of T for arranging.Great temperature is set, can be with reference to various lasers service manual, the temperature in the time of can providing laser test above and the corresponding relation of centre wavelength, probe temperature is the optimum working temperature that will arrange, and does not repeat them here.
The drive system of Distributed Feedback Laser provided by the invention is by two integrated circuit member constant-temperature constant-current drive systems, laser drive system for high integration, simple and be easy to debugging, also easily carry out digital controlly, greatly improved flexibility and the reliability of system.Overcome PID controller that discrete device builds and carried out automated power control (APC) and automatic temperature-adjusting to control the circuit that (ATC) bring complicated, easily made mistakes, and the pid control parameter inconvenience such as difficult adjustment extremely.
Obviously, those skilled in the art can carry out various changes and modification and not depart from the spirit and scope of the present invention invention.Like this, if within of the present invention these are revised and modification belongs to the scope of the claims in the present invention and equivalent technologies thereof, the present invention is also intended to comprise these change and modification.
Claims (8)
1. a drive system for Distributed Feedback Laser, comprises:
Constant-current drive circuit and constant temperature drive circuit, couple respectively described Distributed Feedback Laser;
Master controller, in order to receive an external drive instruction to parse corresponding constant current control signal and thermostatic control signal output;
DA transducer, couple described constant-current drive circuit, constant temperature drive circuit and master controller, in order to receive described constant current control signal and the thermostatic control signal of described master controller output and to carry out DA conversion, to generate constant current, control voltage and thermostatic control voltage and export to described constant-current drive circuit and constant temperature drive circuit;
Wherein, described constant temperature drive circuit and described constant-current drive circuit all adopt monolithic integrated circuit, and the parameter of voltage and thermostatic control voltage control Distributed Feedback Laser is controlled in the constant current of exporting by DA transducer, so that the luminous power of described Distributed Feedback Laser stable output.
2. the drive system of Distributed Feedback Laser as claimed in claim 1, it is characterized in that: described master controller comprises constant current control table and thermostatic control table, it parses corresponding constant current control signal and thermostatic control signal output by described constant current control table and thermostatic control table after receiving external drive instruction.
3. the drive system of Distributed Feedback Laser as claimed in claim 1, is characterized in that: described constant-current drive circuit comprises a controller, in order to the Output optical power of described Distributed Feedback Laser is carried out to control and compensation, to stablize the Output optical power of described Distributed Feedback Laser.
4. the drive system of Distributed Feedback Laser as claimed in claim 1; it is characterized in that: described constant-current drive circuit detects the size of described Distributed Feedback Laser Output optical power; if exceed a setting threshold, described constant-current drive circuit automatically shuts down to protect described Distributed Feedback Laser.
5. the drive system of Distributed Feedback Laser as claimed in claim 1; it is characterized in that: described constant temperature drive circuit comprises a voltage comparator; described thermostatic control voltage is accepted in one end of described voltage comparator; the other end receives a reference voltage of setting; when described thermostatic control electric voltage exception, described voltage comparator is exported a triggering level to automatically shut down described constant-current drive circuit to protect described Distributed Feedback Laser.
6. a driving method for Distributed Feedback Laser, is characterized in that:
The master controller that connects the drive system of the Distributed Feedback Laser as described in any one in claim 1 to 5 with a PC;
According to the required drive current of described Distributed Feedback Laser and temperature, described external drive instruction is set on described PC;
By described PC, send described external drive instruction to described master controller, so that described master controller output constant current control signal and thermostatic control signal.
7. the driving method of Distributed Feedback Laser as claimed in claim 6, is characterized in that: described PC carries out verification to described external drive instruction before sending described external drive instruction.
8. the driving method of Distributed Feedback Laser as claimed in claim 6, is characterized in that: described PC connects the master controller of the drive system of described Distributed Feedback Laser by RS232 bus.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106410604A (en) * | 2016-10-21 | 2017-02-15 | 北京信息科技大学 | Butterfly packaged SG-DBR (Sampled Grating Distributed Bragg Reflector) tunable semiconductor laser module control method |
| CN108508940A (en) * | 2018-04-02 | 2018-09-07 | 太原理工大学 | laser temperature feedback regulation control circuit and method |
| CN110148878A (en) * | 2019-06-20 | 2019-08-20 | 山东大学 | A kind of control circuit and control method of tunable laser |
| CN110391590A (en) * | 2019-07-23 | 2019-10-29 | 中国电子科技集团公司第十一研究所 | A pulsed laser driving power supply system and its driving method |
| CN116047954A (en) * | 2022-12-20 | 2023-05-02 | 苏州贝林激光有限公司 | Fiber laser control system and its control method |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106410604A (en) * | 2016-10-21 | 2017-02-15 | 北京信息科技大学 | Butterfly packaged SG-DBR (Sampled Grating Distributed Bragg Reflector) tunable semiconductor laser module control method |
| CN106410604B (en) * | 2016-10-21 | 2019-05-07 | 北京信息科技大学 | Butterfly package SG-DBR tunable semiconductor laser module control method |
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| CN108508940B (en) * | 2018-04-02 | 2020-07-31 | 太原理工大学 | Laser temperature feedback adjustment control circuit and method |
| CN110148878A (en) * | 2019-06-20 | 2019-08-20 | 山东大学 | A kind of control circuit and control method of tunable laser |
| CN110391590A (en) * | 2019-07-23 | 2019-10-29 | 中国电子科技集团公司第十一研究所 | A pulsed laser driving power supply system and its driving method |
| CN116047954A (en) * | 2022-12-20 | 2023-05-02 | 苏州贝林激光有限公司 | Fiber laser control system and its control method |
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