CN105813344A - Optical module lighting power control system and control method therefor - Google Patents
Optical module lighting power control system and control method therefor Download PDFInfo
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- CN105813344A CN105813344A CN201510000495.2A CN201510000495A CN105813344A CN 105813344 A CN105813344 A CN 105813344A CN 201510000495 A CN201510000495 A CN 201510000495A CN 105813344 A CN105813344 A CN 105813344A
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Abstract
The invention discloses an optical module lighting power control system and a control method therefor. The control system comprises a signal receiving unit, an illuminating unit, an illuminating power detection unit, an isolation unit, an amplification circuit, a current detection unit, a temperature detection unit, a feedback unit, a current control unit and a control unit. The beneficial effects of a technical solution of the optical module lighting power control system and the control method therefor are that intelligent control can be realized according to characteristics of each type of laser device, that output lighting power stabilizes within a 0.5 dB variation range at high and low temperatures of -40 to 85 DEG C can be ensured, working efficiency is greatly improved, the laser device can be prevented from being burnt out, the performance of the laser device can be assessed, service life of the laser device can be determined, early warning can be given in advance, and the laser device can be effectively protected from being burnt out due to excessive currents.
Description
Technical field
The present invention relates to a kind of luminous power device, particularly relate to the optical power control system of a kind of optical module.
Background technology
At present, microwave signal is substantially all employing microwave cable transmission microwave signal, but, its differential loss of microwave cable is bigger, and particularly during long range propagation, its differential loss is the biggest, big to the demand that cannot meet system.Now, some company begins with optical transport microwave signal, it is simply that on microwave signal directly modulation to laser, then, by fiber-optic transfer because laser to transmit differential loss in optical fiber smaller, can be distance distant for microwave signal transmission.In order to microwave signal is modulated on laser, it is necessary to use microwave light module, this optical module is exactly a kind of electro-optic device in fact.The most crucial circuit of this device is exactly optical power control circuit, and this control circuit controls the Output optical power of laser instrument, allows its optical power control exported within the scope of system requirements.At present, a lot of control circuits all use the control circuit of simulation, its circuit needs the voltage of regulator potentiometer manually to control the output voltage of laser instrument, the control circuit of this simulation, voltage by the back light detector of detection laser, control the Output optical power of laser instrument, in the case of high/low temperature, the characteristic of laser instrument there occurs change, and the amplification of analog control circuit and benchmark are fixing, do not adapt to the characteristic changing of laser instrument, so, in the case of high/low temperature, the Output optical power fluctuation ratio of its laser instrument is bigger, particularly under low temperature condition, its fluctuation is little to meet the demand of system, its Output optical power cannot be allowed to keep constant.
Summary of the invention
It is an object of the invention to provide optical power control system and the control method thereof of a kind of optical module, described optical power control system can control the Output optical power of laser instrument；Can also make laser instrument in the case of high/low temperature, make Output of laser luminous power keep constant；Aborning, ATS(Auto-Test System can be used) debug and produce, it is not necessary to manually adjust potentiometer, production efficiency can be greatly improved.
To achieve these goals, technical scheme is as follows:
A kind of optical power control system of optical module, including:
Signal receiving unit, is used for receiving microwave signal and exporting microwave signal to luminescence unit；
Luminescence unit, including laser instrument, in order to receive the microwave signal output laser signal through microwave signal modulation；
Luminous power detector unit, detection luminescence unit laser instrument luminous power dorsad and produce sampled signal；
Isolated location, isolates amplifying circuit, feedback unit with luminous power detector unit, prevents amplifying circuit and feedback unit from affecting the sampled signal that luminous power detector unit produces；
Amplifying circuit, is amplified the sampled signal that luminous power detector unit produces；
Current detecting unit, the laser diode current size of detection luminescence unit, and send current sampling signal to control unit；
Temperature detecting unit, the temperature of detecting system also produces temperature signal and is transferred to control unit；
Feedback unit, controls the output of the laser signal of luminescence unit according to the sampled signal of luminous power detector unit and the comparative result of reference signal；
Current control unit, controls the operating current of laser instrument in luminescence unit according to the control signal of feedback unit output, and described current control unit exports the electric current with value of the operating current with laser instrument to current detecting unit simultaneously；
Control unit, arranges reference signal according to the temperature of the optical module of temperature detecting unit detection；The current sampling signal sent according to current detecting unit detection judges the life-span of laser instrument, decides whether to send early warning signal；The sampled signal that the luminous power dorsad of the laser instrument according to the detection of luminous power detector unit produces arranges reference signal.
Described signal receiving unit is connected with luminescence unit, and microwave signal is to luminescence unit after signal receiving unit enters, and in luminescence unit, microwave signal exports after ovennodulation to laser signal；Described luminescence unit is connected with luminous power detector unit, described luminous power detector unit is connected with isolated location, luminous power detector unit detection laser luminous power dorsad and produce sampled signal export to isolated location, exported to amplifying circuit by a road sampled signal after isolated location, exporting after the sampled signal that luminous power detector unit produces being amplified in amplifying circuit to control unit, control unit arranges reference signal according to sampled signal and exports to feedback unit；Exported to feedback unit by another road sampled signal after isolated location, described feedback unit is connected with current control unit, feedback unit produces control signal according to the comparative result of sampled signal and reference signal and exports to current control unit, described current control unit is connected with current detecting unit and luminescence unit, described current control unit produces a road electric current to luminescence unit according to the control signal that feedback circuit exports, described current control unit exports an equal amount of electric current in another road to current detecting unit, current detecting unit is connected with control unit, the size of current of described current detecting unit detection laser also produces current sampling signal and exports to control unit, control unit arranges reference signal according to current sampling signal and exports to feedback unit；Described temperature detecting unit is connected with control unit, and produces temperature signal and be transferred to control unit, and control unit arranges reference signal according to temperature signal and exports to feedback unit.
The optical power control system of described a kind of optical module, its signal receiving unit includes: RF input port 101, microstrip line 102, capacitance 103 and broadband inductor 121；Microwave signal inputs from RF input port 101, is transmitted by microstrip line 102, and by output after capacitance 103 to luminescence unit, described broadband inductor 121 enters current control unit in order to prevent microwave signal.
The optical power control system of described a kind of optical module, its described luminescence unit includes: micro-strip matched line 104, laser instrument LD105 and optical fiber 106；The microwave signal inputted by capacitance 103 is modulated on laser instrument LD105 through micro-strip matched line 104, and the laser signal that laser instrument LD105 produces is exported by optical fiber 106.
The optical power control system of described a kind of optical module, its described luminous power detector unit detection luminous power dorsad of laser signal the sampled signal produced are voltage signals；Described luminous power detector unit includes: the backlight detector PD117 of laser instrument and sampling resistor 120；During the laser signal that laser instrument LD105 produces, the Laser Transmission at the laser instrument LD105 back side is on the backlight detector PD117 of laser instrument, now, the electric current that the backlight detector PD117 of laser instrument produces is transferred to sampling resistor 120 through circuit line 116, sampling resistor 120 produces corresponding voltage signal, isolated location 113, by described voltage signal and amplifying circuit 115 and feedback unit isolation, prevents amplifying circuit 115 and feedback unit from affecting on sampling resistor 120 and produces corresponding voltage signal.
The optical power control system of described a kind of optical module, the reference signal that its described control unit is arranged is reference voltage signal；Described feedback unit is integration negative-feedback circuit 112, and a road input voltage of described integration negative-feedback circuit 112 is the voltage signal that the voltage signal of the sampling resistor 120 of luminous power detector unit inputs through isolated location 113；Another road input voltage is the reference voltage signal that control unit is arranged；112 two input voltages of described integration negative-feedback circuit compare and integration exports one and controls voltage signal to current control unit 107.
The optical power control system of described a kind of optical module, the control voltage signal output of its integration negative-feedback circuit 112 output is to described current control unit 107, the voltage signal that controls that described current control unit 107 exports according to negative-feedback circuit 123,223 produces a road electric current to the laser instrument LD105 of luminescence unit, to control the luminous power of laser instrument LD105, described current control unit 107 exports an equal amount of electric current in another road to current detecting unit 108 with the size of current of detection laser LD105.
The optical power control system of described a kind of optical module, its described control unit includes cpu circuit 114, D/A converting circuit 110, negative/positive pressure change-over circuit 111；The input of described one group of negative/positive pressure change-over circuit 111 is connected with amplifying circuit 115 output, the sampled signal of described amplifying circuit 115 output is exported to D/A converting circuit 110 by negative/positive pressure change-over circuit 111, described D/A converting circuit 110 is connected with cpu circuit 114, exporting after the sampled signal of analogue signal standard is converted in D/A converting circuit 110 sampled signal of digital signal standard to cpu circuit 114, described cpu circuit 114 arranges reference signal according to sampled signal and exports to integration negative-feedback circuit 112；The input of another group negative/positive pressure change-over circuit 111 described is connected with current detecting unit 108 output, the current sampling signal that described current detecting unit 108 produces is exported to D/A converting circuit 110 by negative/positive pressure change-over circuit 111, described D/A converting circuit 110 is connected with cpu circuit 114, export to cpu circuit 114 after the current sampling signal of analogue signal standard is converted in D/A converting circuit 110 current sampling signal of digital signal standard, described cpu circuit 114 is arranged reference signal according to current sampling signal and is exported to integration negative-feedback circuit 112 by negative/positive pressure change-over circuit 111；Described temperature detecting unit 118 is connected with cpu circuit 114, and produces temperature signal and be transferred to cpu circuit 114, and cpu circuit 114 is arranged reference signal according to temperature signal and exported to integration negative feedback unit 123 by negative/positive pressure change-over circuit 111；
The optical power control system of described a kind of optical module, its described control unit include cpu circuit 114,232, D/A converting circuit 110；The sampled signal of described amplifying circuit 115 output exports to D/A converting circuit 110, described D/A converting circuit 110 is connected with cpu circuit 114, exporting after the sampled signal of analogue signal standard is converted in D/A converting circuit 110 sampled signal of digital signal standard to cpu circuit 114, described cpu circuit 114 arranges reference signal according to sampled signal and exports to integration negative-feedback circuit 112；The current sampling signal that described current detecting unit 108 produces exports to D/A converting circuit 110, described D/A converting circuit 110 is connected with cpu circuit 114, exporting after the current sampling signal of analogue signal standard is converted in D/A converting circuit 110 current sampling signal of digital signal standard to cpu circuit 114, described cpu circuit 114 arranges reference signal according to current sampling signal and exports to integration negative-feedback circuit 112；Described temperature detecting unit 118 is connected with cpu circuit 114, and produces temperature signal and be transferred to cpu circuit 114, and cpu circuit 114 arranges reference signal according to temperature signal and exports to integration negative feedback unit 123,223；
The optical power control system of described a kind of optical module, its described control unit also includes I2C interface circuit 119, described I2C interface circuit 119 is connected with cpu circuit 114, and described control unit can control the work of cpu circuit 114 with external device communication or external equipment by I2C interface circuit 119 by I2C interface circuit 119.
The optical power control system of described a kind of optical module, its described optical power control system also includes current foldback circuit 109, excessive and burn laser instrument LD105 with the electric current that prevents laser instrument LD105.
The control method of the optical power control system of a kind of optical module, described method comprises the steps:
A) luminous power detector unit detection luminescence unit laser instrument luminous power dorsad and produce sampled signal, described luminous power detector unit produce sampled signal transmit to feedback unit；
B) sampled signal and the reference signal of luminous power detector unit are compared by described feedback unit, judge that the luminous power of laser instrument is whether in the setting value of system, if the luminous power of laser instrument is not in the setting value of system, feedback unit produces control signal and exports to current control unit, described current control unit adjusts the electric current of laser instrument according to control signal, default value is returned to the luminous power of control laser instrument, described current control unit is simultaneously to the electric current of the same value of electric current of current detecting unit output and the laser instrument of luminescence unit, laser diode current size for current detecting unit detection luminescence unit, current sampling signal is sent to control unit after described current detecting unit detection laser electric current；If the luminous power of laser instrument is in the setting value of system, then send current sampling signal to control unit after the laser diode current current of current detecting unit detection luminescence unit；
C) according to the current sampling signal that current detecting unit sends, control unit judges whether the electric current of laser instrument exceedes normal current value, if not less than normal current value, then repeats step a) and b)；If it exceeds normal current value, then control unit detects the current sampling signal sent according to current detecting unit, it is judged that the electric current of laser instrument exceedes the absolute amount definite value of the electric current of laser instrument, and control unit sends laser ageing early warning signal；
D) control unit can also arrange reference signal according to the temperature of the optical module of temperature detecting unit detection, the temperature of temperature detecting unit detecting system also produces temperature signal and is transferred to control unit, described control unit arranges corresponding reference signal output reference signal to feedback unit for relevant temperature, sampled signal and the reference signal of luminous power detector unit are compared generation control signal by described feedback unit, described control signal exports to current control unit, described current control unit controls the operating current of laser instrument in luminescence unit according to control signal, default value is returned to the luminous power of control laser instrument.
Using prior art after technical scheme to compare, the present invention possesses following advantage and beneficial effect:
1. the control in the present invention uses control unit CPU(single-chip microcomputer) mode of Based Intelligent Control, it is possible to carry out Based Intelligent Control according to the characteristic of every a laser instrument, it is ensured that Output optical power stable high/low temperature-40～85 degree stably within 0.5dB excursion.
2.
In the present invention, CPU(single-chip microcomputer can be passed through) carry out reference voltage setting, it is not necessary to and artificial mechanical adjusts, and especially in research and development and producing, greatly improves work efficiency.
3.
In the present invention, can be by CPU(single-chip microcomputer) luminous power of laser instrument is detected in real time, one thresholding can be set in the algorithm, when the luminous power of detection is more than or less than the scope set, begin to report to the police, when luminous power is more than the scope set, CPU(single-chip microcomputer) by the way of reference voltage is set, close laser instrument, prevent laser instrument from burning out.
4.
In the present invention, can be by CPU(single-chip microcomputer) laser works electric current is detected in real time, can be in conjunction with the size of detection laser luminous power, the performance of laser instrument is estimated, particularly its degree of aging, can judge the life-span of laser instrument, and give warning in advance with combination algorithm, allow engineering staff change optical module in advance, prevent system crash.
5.
In the present invention, being integrated with current foldback circuit, be possible to prevent CPU software to occur the when that defect being collapsed, effectively protection laser instrument burns due to excessive electric current.
6.
In the present invention, integrated temperature detector unit, CPU real-time read module operating temperature, when temperature is too low or too high, CPU will turn off laser instrument, and protection laser instrument preserves from.
7.
In the present invention, use CPU(single-chip microcomputer) technology, to laser optical power, the operating current of laser instrument and reference voltage, detect and adjust, ATS(automatization test system can be used completely in research and development and production) test, without manual testing, drastically increase work efficiency.
Accompanying drawing explanation
Fig. 1 is the optical power control system block diagram of optical module；
Fig. 2 is the circuit diagram of the embodiment of the present invention one；
Fig. 3 is the circuit diagram of the embodiment of the present invention two.
In figure, 101 RF input ports, 102 microstrip lines; 103 capacitances, 104 micro-strip matched lines, 105 laser instrument LD; 106 optical fiber; 107 current control units, 108 current detecting units, 109 current foldback circuits; 110 D/A converting circuits; 111 negative/positive pressure change-over circuits, 112 integration negative-feedback circuits, 113 isolated locations; 114 cpu circuits; 115 amplifying circuits, 116 circuit line, the backlight detector PD of 117 laser instrument; 118 temperature detecting units; 119 I2C interface circuits, 120 sampling resistors, 121 broadband inductor.
Detailed description of the invention
The invention will be further described with embodiment below in conjunction with the accompanying drawings.
Embodiment one
The enforcement of the present invention sees Fig. 2; mainly include RF input port 101, microstrip line 102, capacitance 103, micro-strip matched line 104, laser instrument LD105, the backlight detector PD 117 of laser instrument, circuit line 116, broadband inductor 121, sampling resistor 120, current control unit 107, current detecting unit 108, current foldback circuit 109, negative/positive pressure change-over circuit 111, D/A converting circuit 110, integration negative-feedback circuit 112, isolated location 113, cpu circuit 114, amplifying circuit 115 and temperature detecting unit 118.
nullMicrowave signal inputs from RF input port 101，Transmitted by microstrip line 102，Must be with capacitance 103 every directly，Avoid by external action being optically isolated the DC voltage of the optical power control system of module，Microwave signal is by after capacitance 103，It is modulated on laser instrument LD105 through micro-strip matched line 104，Laser signal after modulation is exported by optical fiber 106，During laser instrument LD105 work，The back side has laser to export simultaneously，It is transferred on the backlight detector PD117 of laser instrument，The backlight detector PD117 of laser instrument produces electric current，It is transferred to sampling resistor 120 through circuit line 116，Sampling resistor 120 produces corresponding voltage namely sampled signal，This voltage is proportional with the electric current of sampling resistor 120，And with the backlight detector PD117 of laser instrument, the electric current of sampling resistor 120 detects that laser power is relevant，When laser power is the biggest，The electric current of its sampling resistor 120 is the biggest，Also it is proportional，So，The voltage produced on sampling resistor 120 is proportional with the luminous power of laser instrument LD105；The voltage namely the sampled signal that produce on sampling resistor 120 are sent to isolated location 113, the two isolated location plays buffer action, constant from the voltage of isolated location 113 output, isolated location 113 mainly prevents circuit below from affecting the voltage produced on sampling resistor 120.
Voltage by a branch road isolated location 113, it is input to amplifying circuit 115 be amplified, it is then input on negative/positive pressure change-over circuit 111, negative pressure is transferred to malleation, its absolute value is constant, malleation after conversion is converted into digital signal and inputs to cpu circuit 114 after being input to D/A converting circuit 110, this branch road is substantially carried out luminous power detection, and described cpu circuit 114 arranges reference voltage according to voltage and exports to integration negative-feedback circuit 112；To arrange two thresholdings in the algorithm of cpu circuit 114, one is high threshold, another one low threshold, as long as exceeding the two thresholding, cpu circuit 114 just produces an alarm, is transferred to external equipment by I2C circuit 133.
nullVoltage by another branch road isolated location 113，Input to integration negative-feedback circuit 112，This integration negative-feedback circuit 112 also input signal is the reference voltage that cpu circuit 114 is arranged，Described reference voltage is to be produced by cpu circuit 114，112 two input voltages of integration negative-feedback circuit compare and integration produces a control signal，The output of described integration negative-feedback circuit 112 is connected with current control unit 107，The electric current of the laser instrument LD105 that current control unit 107 controls after receiving the control signal that integration negative-feedback circuit 112 produces，The most just control the input current size of laser instrument LD105，Laser will be sent when electric current exceedes the threshold value of laser instrument LD105，Electric current its Output optical power the biggest is the biggest，The least luminous power of electric current is the least.
nullThe current sampling signal that current detecting unit 108 produces is exported to D/A converting circuit 110 by negative/positive pressure change-over circuit 111，Described D/A converting circuit 110 is connected with cpu circuit 114，Export to cpu circuit 114 after the current sampling signal of analogue signal standard is converted in D/A converting circuit 110 current sampling signal of digital signal standard，Described cpu circuit 114 arranges reference voltage according to current sampling signal and exports to integration negative-feedback circuit 112，112 two input voltages of integration negative-feedback circuit compare and integration produces a control signal，The output of described integration negative-feedback circuit 112 is connected with power control unit 111，The electric current of the laser instrument LD105 that power control unit 111 controls after receiving the control signal that integration negative-feedback circuit 112 produces，The most just control the size of current of laser instrument LD105，Laser will be sent when electric current exceedes the threshold value of laser instrument，Electric current its Output optical power the biggest is the biggest，The least luminous power of electric current is the least.
Described temperature sensor 150 is connected with cpu circuit 114, and produce temperature signal and be transferred to cpu circuit 114, cpu circuit 114 arranges reference voltage according to temperature signal, and transmit to integration negative feedback unit 123, 112 two input voltages of integration negative-feedback circuit compare and integration produces a control signal, the output of described integration negative-feedback circuit 112 is connected with power control unit 111, the electric current of the laser instrument LD105 that power control unit 111 controls after receiving the control signal that integration negative-feedback circuit 112 produces, the most just control the size of current of laser instrument LD105, laser will be sent when electric current exceedes the threshold value of laser instrument, electric current its Output optical power the biggest is the biggest, the least luminous power of electric current is the least.
Embodiment two
The embodiment of the present invention two is shown in Fig. 3; mainly include RF input port 101, capacitance 103, micro-strip matched line 104, laser instrument LD105, the backlight detector PD 117 of laser instrument, broadband inductor 121, sampling resistor 120, current control unit 107, current detecting unit 108, current foldback circuit 109, D/A converting circuit 110, integration negative-feedback circuit 112, isolated location 113, cpu circuit 114, amplifying circuit 115 and temperature detecting unit 118.
nullMicrowave signal inputs from RF input port 101，Transmitted by microstrip line 102，Must be with capacitance 103 every directly，Avoid by external action being optically isolated the DC voltage of the optical power control system of module，Microwave signal is by after capacitance 103，It is modulated on laser instrument LD105 through micro-strip matched line 104，Laser signal after modulation is exported by optical fiber 106，During laser instrument LD105 work，The back side has laser to export simultaneously，It is transferred on the backlight detector PD117 of laser instrument，The backlight detector PD117 of laser instrument produces electric current，It is transferred to sampling resistor 120 through circuit line 116，Sampling resistor 120 produces corresponding voltage namely sampled signal，This voltage is proportional with the electric current of sampling resistor 120，And with the backlight detector PD117 of laser instrument, the electric current of sampling resistor 120 detects that laser power is relevant，When laser power is the biggest，The electric current of its sampling resistor 120 is the biggest，Also it is proportional，So，The voltage produced on sampling resistor 120 is proportional with the luminous power of laser instrument LD105；The voltage namely the sampled signal that produce on sampling resistor 120 are sent to isolated location 113, isolated location plays buffer action, constant from the voltage of isolated location 113 output, isolated location 113 mainly prevents circuit below from affecting the voltage produced on sampling resistor 120.
Voltage by a branch road isolated location 113, it is input to amplifying circuit 115 be amplified, it is converted into digital signal input after being then input to D/A converting circuit 110 to arrange reference voltage according to voltage export to integration negative-feedback circuit 112 to cpu circuit 114, described cpu circuit 114；An integration negative-feedback circuit 112 also input signal is the reference voltage that cpu circuit 114 is arranged, described reference voltage is to be produced by cpu circuit 114, 112 two input voltages of integration negative-feedback circuit compare and integration produces a control signal, the output of described integration negative-feedback circuit 112 is connected with current control unit 107, the electric current of the laser instrument LD105 that current control unit 107 controls after receiving the control signal that integration negative-feedback circuit 112 produces, the most just control the input current size of laser instrument LD105, laser will be sent when electric current exceedes the threshold value of laser instrument LD105, electric current its Output optical power the biggest is the biggest, the least luminous power of electric current is the least；To arrange two thresholdings in the algorithm of cpu circuit 114, one is high threshold, another one low threshold, as long as exceeding the two thresholding, cpu circuit 114 just produces an alarm, is transferred to external equipment by I2C circuit 233.
nullVoltage by another branch road isolated location 113，Input to integration negative-feedback circuit 112，This integration negative-feedback circuit 112 also input signal is the reference voltage that cpu circuit 114 is arranged，Described reference voltage is to be produced by cpu circuit 114，112 two input voltages of integration negative-feedback circuit compare and integration produces a control signal，The output of described integration negative-feedback circuit 112 is connected with current control unit 107，The electric current of the laser instrument LD105 that current control unit 107 controls after receiving the control signal that integration negative-feedback circuit 112 produces，The most just control the input current size of laser instrument LD105，Laser will be sent when electric current exceedes the threshold value of laser instrument LD105，Electric current its Output optical power the biggest is the biggest，The least luminous power of electric current is the least.
nullThe current sampling signal that current detecting unit 108 produces exports to D/A converting circuit 110，Described D/A converting circuit 110 is connected with cpu circuit 114，Export to cpu circuit 114 after the current sampling signal of analogue signal standard is converted in D/A converting circuit 110 current sampling signal of digital signal standard，Described cpu circuit 114 arranges reference voltage according to current sampling signal and exports to integration negative-feedback circuit 112，112 two input voltages of integration negative-feedback circuit compare and integration produces a control signal，The output of described integration negative-feedback circuit 112 is connected with power control unit 211，The electric current of the laser instrument LD105 that power control unit 211 controls after receiving the control signal that integration negative-feedback circuit 112 produces，The most just control the size of current of laser instrument LD105，Laser will be sent when electric current exceedes the threshold value of laser instrument，Electric current its Output optical power the biggest is the biggest，The least luminous power of electric current is the least.
Described temperature detecting unit 118 is connected with cpu circuit 114, and produce temperature signal and be transferred to cpu circuit 114, cpu circuit 114 arranges reference voltage according to temperature signal, and transmit to integration negative feedback unit 223, 112 two input voltages of integration negative-feedback circuit compare and integration produces a control signal, the output of described integration negative-feedback circuit 112 is connected with power control unit 211, the electric current of the laser instrument LD105 that power control unit 211 controls after receiving the control signal that integration negative-feedback circuit 112 produces, the most just control the size of current of laser instrument LD105, laser will be sent when electric current exceedes the threshold value of laser instrument, electric current its Output optical power the biggest is the biggest, the least luminous power of electric current is the least.
Using prior art after embodiments of the invention to compare, the present embodiment possesses following advantage and beneficial effect:
1. the control in the present invention uses control unit CPU(single-chip microcomputer) mode of Based Intelligent Control, it is possible to carry out Based Intelligent Control according to the characteristic of every a laser instrument, it is ensured that Output optical power stable high/low temperature-40～85 degree stably within 0.5dB excursion.
2.
In the present invention, CPU(single-chip microcomputer can be passed through) carry out reference voltage setting, it is not necessary to and artificial mechanical adjusts, and especially in research and development and producing, greatly improves work efficiency.
3.
In the present invention, can be by CPU(single-chip microcomputer) luminous power of laser instrument is detected in real time, one thresholding can be set in the algorithm, when the luminous power of detection is more than or less than the scope set, begin to report to the police, when luminous power is more than the scope set, CPU(single-chip microcomputer) by the way of reference voltage is set, close laser instrument, prevent laser instrument from burning out.
4.
In the present invention, can be by CPU(single-chip microcomputer) laser works electric current is detected in real time, can be in conjunction with the size of detection laser luminous power, the performance of laser instrument is estimated, particularly its degree of aging, can judge the life-span of laser instrument, and give warning in advance with combination algorithm, allow engineering staff change optical module in advance, prevent system crash.
5.
In the present invention, being integrated with current foldback circuit, be possible to prevent CPU software to occur the when that defect being collapsed, effectively protection laser instrument burns due to excessive electric current.
6.
In the present invention, integrated temperature detector unit, CPU real-time read module operating temperature, when temperature is too low or too high, CPU will turn off laser instrument, and protection laser instrument preserves from.
7.
In the present invention, use CPU(single-chip microcomputer) technology, to laser optical power, the operating current of laser instrument and reference voltage, detect and adjust, ATS(automatization test system can be used completely in research and development and production) test, without manual testing, drastically increase work efficiency.
Described above to the disclosed embodiments, make professional and technical personnel in the field be capable of or use the present invention, multiple amendment to these embodiments is apparent from for those skilled in the art, generic principles defined herein can realize without departing from the spirit or scope of the present invention in other embodiments.Therefore, the present invention is not intended to be limited to the embodiments shown herein, and is to fit to the widest range consistent with principles disclosed herein and features of novelty.
Claims (11)
1. the optical power control system of an optical module, it is characterised in that including:
Signal receiving unit, is used for receiving microwave signal and exporting microwave signal to luminescence unit；
Luminescence unit, including laser instrument, in order to receive the microwave signal output laser signal through microwave signal modulation；
Luminous power detector unit, detects the luminous power dorsad of luminescence unit laser instrument and produces sampled signal；
Isolated location, isolates amplifying circuit, feedback unit with luminous power detector unit, prevents amplifying circuit and feedback unit from affecting the sampled signal that luminous power detector unit produces；
Amplifying circuit, is amplified the sampled signal that luminous power detector unit produces；
Current detecting unit, the laser diode current size of detection luminescence unit, and send current sampling signal to control unit；
Temperature detecting unit, the temperature of detecting system also produces temperature signal and is transferred to control unit；
Feedback unit, controls the output of the laser signal of luminescence unit according to the sampled signal of luminous power detector unit and the comparative result of reference signal；
Current control unit, controls the operating current of laser instrument in luminescence unit according to the control signal of feedback unit output, and described current control unit exports the electric current with value of the operating current with laser instrument to current detecting unit simultaneously；
Control unit, arranges reference signal according to the temperature of the optical module of temperature detecting unit detection；The current sampling signal sent according to current detecting unit detection judges the life-span of laser instrument, decides whether to send early warning signal；The sampled signal that the luminous power dorsad of the laser instrument according to the detection of luminous power detector unit produces arranges reference signal；
Described signal receiving unit is connected with luminescence unit, and microwave signal is to luminescence unit after signal receiving unit enters, and in luminescence unit, microwave signal exports after ovennodulation to laser signal；Described luminescence unit is connected with luminous power detector unit, described luminous power detector unit is connected with isolated location, the luminous power dorsad of luminous power detector unit detection laser also produces sampled signal and exports to isolated location, exported to amplifying circuit by a road sampled signal after isolated location, exporting after the sampled signal that luminous power detector unit produces being amplified in amplifying circuit to control unit, control unit arranges reference signal according to sampled signal and exports to feedback unit；Exported to feedback unit by another road sampled signal after isolated location, described feedback unit is connected with current control unit, feedback unit produces control signal according to the comparative result of sampled signal and reference signal and exports to current control unit, described current control unit is connected with current detecting unit and luminescence unit, described current control unit produces a road electric current to luminescence unit according to the control signal that feedback circuit exports, described current control unit exports an equal amount of electric current in another road to current detecting unit, current detecting unit is connected with control unit, the size of current of described current detecting unit detection laser also produces current sampling signal and exports to control unit, control unit arranges reference signal according to current sampling signal and exports to feedback unit；Described temperature detecting unit is connected with control unit, and produces temperature signal and be transferred to control unit, and control unit arranges reference signal according to temperature signal and exports to feedback unit.
The optical power control system of a kind of optical module the most as claimed in claim 1, it is characterised in that described signal receiving unit includes: RF input port (101), microstrip line (102), capacitance (103) and broadband inductor (121)；Microwave signal inputs from RF input port (101), is transmitted by microstrip line (102), is exported to luminescence unit afterwards by capacitance (103), and described broadband inductor (121) enters current control unit in order to prevent microwave signal.
The optical power control system of a kind of optical module the most as claimed in claim 1 or 2, it is characterised in that described luminescence unit includes: micro-strip matched line (104), laser instrument LD(105) and optical fiber (106)；The microwave signal inputted by capacitance (103) is modulated at laser instrument LD(105 through micro-strip matched line (104)) on, laser instrument LD(105) laser signal that produces exported by optical fiber (106).
The optical power control system of a kind of optical module the most as claimed in claim 3, it is characterised in that the described luminous power detector unit detection luminous power dorsad of laser signal the sampled signal produced are voltage signals；Described luminous power detector unit includes: the backlight detector PD(117 of laser instrument) and sampling resistor (120)；Laser instrument LD(105) produce laser signal time, laser instrument LD(105) Laser Transmission at the back side is to the backlight detector PD(117 of laser instrument) on, now, the backlight detector PD(117 of laser instrument) electric current that produces is transferred to sampling resistor (120) through circuit line (116), at sampling resistor (120) the corresponding voltage signal of upper generation, isolated location (113), by described voltage signal and amplifying circuit (115) and feedback unit isolation, prevents amplifying circuit (115) and feedback unit from affecting sampling resistor (120) the corresponding voltage signal of upper generation.
The optical power control system of a kind of optical module the most as claimed in claim 4, it is characterised in that the reference signal that described control unit is arranged is reference voltage signal；Described feedback unit is integration negative-feedback circuit (112), and a road input voltage of described integration negative-feedback circuit (112) is the voltage signal that the voltage signal of the sampling resistor (120) of luminous power detector unit inputs through isolated location (113)；Another road input voltage is the reference voltage signal that control unit is arranged；Described integration negative-feedback circuit (112) compares two input voltages and integration exports one and controls voltage signal to current control unit (107).
The optical power control system of a kind of optical module the most as claimed in claim 5, it is characterized in that, the control voltage signal output that integration negative-feedback circuit (112) exports is to described current control unit (107), described current control unit (107) is according to negative-feedback circuit (123, 223) voltage signal that controls exported produces a road electric current to the laser instrument LD(105 of luminescence unit), to control laser instrument LD(105) luminous power, described current control unit (107) exports an equal amount of electric current in another road to current detecting unit (108) with detection laser LD(105) size of current.
The optical power control system of a kind of optical module the most as claimed in claim 6, it is characterised in that described control unit includes cpu circuit (114), D/A converting circuit (110), negative/positive pressure change-over circuit (111)；The input of described one group of negative/positive pressure change-over circuit (111) is connected with amplifying circuit (115) output, the sampled signal that described amplifying circuit (115) exports is by negative/positive pressure change-over circuit (111) output to D/A converting circuit (110), described D/A converting circuit (110) is connected with cpu circuit (114), export after the sampled signal of analogue signal standard is converted in D/A converting circuit (110) sampled signal of digital signal standard to cpu circuit (114), described cpu circuit (114) arranges reference signal according to sampled signal and exports to integration negative-feedback circuit (112)；The input of another group negative/positive pressure change-over circuit (111) described is connected with current detecting unit (108) output, the current sampling signal that described current detecting unit (108) produces is by negative/positive pressure change-over circuit (111) output to D/A converting circuit (110), described D/A converting circuit (110) is connected with cpu circuit (114), export after the current sampling signal of analogue signal standard is converted in D/A converting circuit (110) current sampling signal of digital signal standard to cpu circuit (114), described cpu circuit (114) arranges reference signal and by negative/positive pressure change-over circuit (111) output to integration negative-feedback circuit (112) according to current sampling signal；Described temperature detecting unit (118) is connected with cpu circuit (114), and produce temperature signal and be transferred to cpu circuit (114), cpu circuit (114) is arranged reference signal according to temperature signal and is exported to integration negative feedback unit (123) by negative/positive pressure change-over circuit (111).
The optical power control system of a kind of optical module the most as claimed in claim 6, it is characterised in that described control unit includes cpu circuit (114), D/A converting circuit (110)；The sampled signal that described amplifying circuit (115) exports exports to D/A converting circuit (110), described D/A converting circuit (110) is connected with cpu circuit (114), exporting after the sampled signal of analogue signal standard is converted in D/A converting circuit (110) sampled signal of digital signal standard to cpu circuit (114), described cpu circuit (114) arranges reference signal according to sampled signal and exports to integration negative-feedback circuit (112)；The current sampling signal that described current detecting unit (108) produces exports to D/A converting circuit (110), described D/A converting circuit (110) is connected with cpu circuit (114), exporting after the current sampling signal of analogue signal standard is converted in D/A converting circuit (110) current sampling signal of digital signal standard to cpu circuit (114), described cpu circuit (114) arranges reference signal according to current sampling signal and exports to integration negative-feedback circuit (112)；Described temperature detecting unit (118) is connected with cpu circuit (114), and produces temperature signal and be transferred to cpu circuit (114), and cpu circuit (114) arranges reference signal according to temperature signal and exports to integration negative feedback unit (123,223).
9. the optical power control system of a kind of optical module as described in claim 7 or 8 any claim, it is characterized in that, described control unit also includes I2C interface circuit (119), described I2C interface circuit (119) is connected with cpu circuit (114), and described control unit can control the work of cpu circuit (114) with external device communication or external equipment by I2C interface circuit (119) by I2C interface circuit (119).
10. the optical power control system of an optical module as claimed in claim 9, it is characterised in that described optical power control system also includes current foldback circuit (109), to prevent laser instrument LD(105) electric current excessive and burn laser instrument LD(105).
The control method of the optical power control system of 11. 1 kinds of optical modules as claimed in claim 1, described method comprises the steps:
A) luminous power detector unit detection luminescence unit laser instrument luminous power dorsad and produce sampled signal, described luminous power detector unit produce sampled signal transmit to feedback unit；
B) sampled signal and the reference signal of luminous power detector unit are compared by described feedback unit, judge that the luminous power of laser instrument is whether in the setting value of system, if the luminous power of laser instrument is not in the setting value of system, feedback unit produces control signal and exports to current control unit, described current control unit adjusts the electric current of laser instrument according to control signal, default value is returned to the luminous power of control laser instrument, described current control unit is simultaneously to the electric current of the same value of electric current of current detecting unit output and the laser instrument of luminescence unit, laser diode current size for current detecting unit detection luminescence unit, current sampling signal is sent to control unit after described current detecting unit detection laser electric current；If the luminous power of laser instrument is in the setting value of system, then send current sampling signal to control unit after the laser diode current current of current detecting unit detection luminescence unit；
C) according to the current sampling signal that current detecting unit sends, control unit judges whether the electric current of laser instrument exceedes normal current value, if not less than normal current value, then repeats step a) and b)；If it exceeds normal current value, then control unit detects the current sampling signal sent according to current detecting unit, it is judged that the electric current of laser instrument exceedes the absolute amount definite value of the electric current of laser instrument, and control unit sends laser ageing early warning signal；
D) control unit can also arrange reference signal according to the temperature of the optical module of temperature detecting unit detection, the temperature of temperature detecting unit detecting system also produces temperature signal and is transferred to control unit, described control unit arranges corresponding reference signal output reference signal to feedback unit for relevant temperature, sampled signal and the reference signal of luminous power detector unit are compared generation control signal by described feedback unit, described control signal exports to current control unit, described current control unit controls the operating current of laser instrument in luminescence unit according to control signal, default value is returned to the luminous power of control laser instrument.
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