CN105813344B - The optical power control system and control method of a kind of optical module - Google Patents
The optical power control system and control method of a kind of optical module Download PDFInfo
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- CN105813344B CN105813344B CN201510000495.2A CN201510000495A CN105813344B CN 105813344 B CN105813344 B CN 105813344B CN 201510000495 A CN201510000495 A CN 201510000495A CN 105813344 B CN105813344 B CN 105813344B
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Abstract
The invention discloses a kind of optical power control system of optical module and its control method, the control system includes：Signal receiving unit, luminescence unit, luminous power detection unit, isolated location, amplifying circuit, current detecting unit, temperature detecting unit, feedback unit, current control unit, control unit, it is using the beneficial effect of technical scheme：Intelligent control can be carried out according to the characteristic per a laser, ensure that Output optical power is stable stable within 0.5dB excursions in 40~85 degree of high/low temperature；Operating efficiency is greatly improved, prevents laser from burning out；The performance of laser can be assessed, judge the life-span of laser, and given warning in advance；Effectively protection laser prevents from burning due to excessive electric current.
Description
Technical field
The present invention relates to a kind of luminous power device, more particularly to a kind of optical power control system of optical module.
Background technology
At present, microwave signal is substantially all transmits microwave signal using microwave cable, and still, its differential loss of microwave cable compares
Greatly, when particularly transmitting over long distances, its differential loss is just very big, big to can not meet the needs of system.Now, some companies start
Using optical transport microwave signal, exactly microwave signal is directly modulated on laser, then, transmitted by optical fiber, because laser
It is smaller that differential loss is transmitted in optical fiber, can be the distant distance of microwave signal transmission.It is sharp in order to which microwave signal is modulated to
On light, it is necessary to which, using microwave optical module, this optical module is exactly a kind of electro-optic device in fact.The very crucial electricity of this device
Road is exactly optical power control circuit, and this control circuit controls the Output optical power of laser, the optical power control for allowing it to export
Within the scope of system requirements.At present, many control circuits are all needed manually using the control circuit of simulation, its circuit
The voltage for adjusting potentiometer controls the output voltage of laser, the control circuit of this simulation, passes through the back of the body of detection laser
The voltage of photo-detector, to control the Output optical power of laser, in the case of high/low temperature, the characteristic of laser is changed
Become, and the multiplication factor of analog control circuit and benchmark are fixed, it is impossible to the characteristic changing of laser is adapted to, so, in height
Under low temperature condition, the Output optical power fluctuation of its laser is bigger, and particularly under low temperature condition, its fluctuation can hardly meet
The demand of system, its Output optical power can not be allowed to keep constant.
The content of the invention
It is an object of the invention to provide a kind of optical power control system of optical module, the optical power control system can be controlled
The Output optical power of laser processed；Laser can also be made in the case of high/low temperature, output laser optical power is kept constant；
In production, it can be debugged and be produced using ATS (Auto-Test System), it is not necessary to potentiometer is manually adjusted, can be with
Greatly improve production efficiency.
To achieve these goals, technical scheme is as follows：
A kind of optical power control system of optical module, including：
Signal receiving unit, for receiving microwave signal and exporting microwave signal to luminescence unit；
Luminescence unit, including laser, to receive microwave signal, laser signal of the output by microwave signal modulation；
Luminous power detection unit, the luminous power backwards of detection luminescence unit laser simultaneously produce sampled signal；
Isolated location, amplifying circuit, feedback unit are isolated with luminous power detection unit, prevent amplifying circuit and
Feedback unit influences sampled signal caused by luminous power detection unit；
Amplifying circuit, sampled signal caused by luminous power detection unit is amplified；
Current detecting unit, the laser diode current size of luminescence unit is detected, and current sample letter is sent to control unit
Number；
Temperature detecting unit, the temperature of detecting system simultaneously produce temperature signal and are transferred to control unit；
Feedback unit, controlled according to the comparative result of the sampled signal of luminous power detection unit and reference signal luminous single
The power output of the laser signal of member；
Current control unit, the control signal exported according to feedback unit control the work electricity of laser in luminescence unit
Stream, the current control unit is simultaneously to current detecting unit output and the same electric current being worth of operating current of laser；
Control unit, the temperature setting reference signal of the optical module detected according to temperature detecting unit；According to current detecting
The current sampling signal that unit detection is sent judges the life-span of laser, decides whether to send pre-warning signal；According to luminous power
The laser of detection unit detection sets reference signal backwards to sampled signal caused by luminous power.
The signal receiving unit is connected with luminescence unit, and microwave signal is after signal receiving unit entrance to luminous list
Member, microwave signal exports after being modulated to laser signal in luminescence unit；The luminescence unit and luminous power detection are single
Member is connected, and the luminous power detection unit is connected with isolated location, the light backwards of luminous power detection unit detection laser
Power simultaneously produces sampled signal and exported to isolated location, by the way that sampled signal is exported to amplifying circuit all the way after isolated location,
Exported after sampled signal caused by luminous power detection unit is amplified in amplifying circuit to control unit, control unit root
Reference signal is set to export to feedback unit according to sampled signal；Exported by another way sampled signal after isolated location to feedback
Member, the feedback unit are connected with current control unit, and feedback unit produces according to the comparative result of sampled signal and reference signal
Give birth to control signal and export to current control unit, the current control unit and be connected with current detecting unit and luminescence unit,
The control signal that the current control unit exports according to feedback unit produce all the way electric current to luminescence unit, the electric current control
The unit output an equal amount of electric current of another way to current detecting unit, current detecting unit processed is connected with control unit, described
The size of current of current detecting unit detection laser simultaneously produces current sampling signal and exported to control unit, control unit according to
Current sampling signal sets reference signal and exported to feedback unit；The temperature detecting unit is connected with control unit, and produces
Raw temperature signal is transferred to control unit, and control unit sets reference signal according to temperature signal and exported to feedback unit.
A kind of optical power control system of described optical module, its signal receiving unit include：RF input ports 101, micro-strip
Line 102, capacitance 103 and broadband inductor 121；Microwave signal inputs from RF input ports 101, is transmitted by microstrip line 102, leads to
Cross after capacitance 103 and be output to luminescence unit, the broadband inductor 121 is preventing microwave signal from entering current control list
Member.
A kind of optical power control system of described optical module, the luminescence unit described in it include：Micro-strip matched line 104,
Laser LD105 and optical fiber 106；The microwave signal inputted by capacitance 103 is modulated at laser by micro-strip matched line 104
On LD105, laser signal is exported by optical fiber 106 caused by laser LD105.
A kind of optical power control system of described optical module, its luminous power detection unit detection laser signal
It is voltage signal backwards to luminous power and caused sampled signal；The luminous power detection unit includes：The backlight inspection of laser
Survey device PD117 and sampling resistor 120；When laser LD105 produces laser signal, the laser at the laser LD105 back sides is transferred to
On the backlight detector PD117 of laser, now, electric current passes through circuit line 116 caused by the backlight detector PD117 of laser
Sampling resistor 120 is transferred to, produces corresponding voltage signal on sampling resistor 120, isolated location 113 is by the voltage signal
Isolate with amplifying circuit 115 and feedback unit, prevent amplifying circuit 115 and feedback unit from influenceing to produce phase on sampling resistor 120
The voltage signal answered.
A kind of optical power control system of described optical module, the reference signal that its described control unit is set are benchmark electricity
Press signal；The feedback unit is integration negative-feedback circuit 112, and the input voltage all the way of the integration negative-feedback circuit 112 is
The voltage signal of the sampling resistor 120 of luminous power detection unit passes through the voltage signal that isolated location 113 inputs；Another way is defeated
It is the reference voltage signal that control unit is set to enter voltage；The integration negative-feedback circuit 112 compares two input voltages
Compared with and integrate one control voltage signal of output to current control unit 107.
A kind of optical power control system of described optical module, it integrates the control voltage letter that negative-feedback circuit 112 exports
Number output is to the current control unit 107, control that the current control unit 107 exports according to integration negative-feedback circuit 112
Voltage signal processed produces electric current all the way to the laser LD105 of luminescence unit, to control laser LD105 luminous power,
The current control unit 107 exports an equal amount of electric current of another way to current detecting unit 108 with detection laser LD105
Size of current.
A kind of optical power control system of described optical module, its described control unit includes cpu circuit 114, digital-to-analogue turns
Change 110, two groups of negative/positive pressure change-over circuits 111 of circuit；The input of one group of negative/positive pressure change-over circuit 111 and amplification electricity
The output of road 115 is connected, and the sampled signal that the amplifying circuit 115 exports is exported to digital-to-analogue by negative/positive pressure change-over circuit 111
Change-over circuit 110, the D/A converting circuit 110 is connected with cpu circuit 114, by analog signal in D/A converting circuit 110
The sampled signal of standard is exported to cpu circuit 114, the cpu circuit 114 after being converted into the sampled signal of data signal standard
Reference signal is set to export to integration negative-feedback circuit 112 according to sampled signal；Another group of negative/positive pressure change-over circuit 111
The output of input and current detecting unit 108 be connected, current sampling signal caused by the current detecting unit 108, which passes through, to be born
Pressure/malleation change-over circuit 111 is exported to D/A converting circuit 110, the D/A converting circuit 110 to be connected with cpu circuit 114,
The current sample that the current sampling signal of analog signal standard is converted into data signal standard in D/A converting circuit 110 is believed
Output is to cpu circuit 114 after number, and the cpu circuit 114 sets reference signal and by negative pressure/just according to current sampling signal
The output of voltage conversion circuit 111 extremely integration negative-feedback circuit 112；The temperature detecting unit 118 is connected with cpu circuit 114, and produces
Raw temperature signal is transferred to cpu circuit 114, and cpu circuit 114 sets reference signal according to temperature signal and passes through negative/positive pressure
The output of change-over circuit 111 extremely integration negative-feedback unit 123；
A kind of optical power control system of described optical module, its described control unit include cpu circuit 114,232, number
Analog conversion circuit 110；The sampled signal that the amplifying circuit 115 exports is exported to D/A converting circuit 110, the digital-to-analogue conversion
Circuit 110 is connected with cpu circuit 114, and the sampled signal of analog signal standard is converted into numeral in D/A converting circuit 110
Output to cpu circuit 114, the cpu circuit 114 sets reference signal defeated according to sampled signal after the sampled signal of signaling mode
Go out to integration negative-feedback circuit 112；Current sampling signal caused by the current detecting unit 108 is exported to D/A converting circuit
110, the D/A converting circuit 110 is connected with cpu circuit 114, by the electricity of analog signal standard in D/A converting circuit 110
Stream sampled signal is exported to cpu circuit 114, the cpu circuit 114 after being converted into the current sampling signal of data signal standard
Reference signal is set according to current sampling signal and exported to integration negative-feedback circuit 112；The temperature detecting unit 118 and CPU
Circuit 114 is connected, and produces temperature signal and be transferred to cpu circuit 114, and cpu circuit 114 sets reference signal according to temperature signal
And export to integration negative-feedback unit 123,223；
A kind of optical power control system of described optical module, its described control unit also include I2C interface circuit 119,
The I2C interface circuit 119 is connected with cpu circuit 114, and described control unit can be set by I2C interface circuit 119 with outside
Standby communication or external equipment control the work of cpu circuit 114 by I2C interface circuit 119.
A kind of optical power control system of described optical module, its described optical power control system also include overcurrent protection electricity
Road 109, burn laser LD105 to prevent laser LD105 electric current excessive.
A kind of control method of the optical power control system of optical module, methods described comprise the following steps：
A) luminous power detection unit detects the luminous power backwards of the laser of luminescence unit and produces sampled signal, described
Sampled signal caused by luminous power detection unit is transmitted to feedback unit；
B) sampled signal of luminous power detection unit and reference signal are compared by the feedback unit, judge laser
The luminous power of device whether system setting value, if the luminous power of laser is not in the setting value of system, feedback unit
Produce control signal and export to current control unit, the current control unit and the electricity of laser is adjusted according to control signal
Stream, to control the luminous power of laser to return to default value, the current control unit is simultaneously defeated to current detecting unit
Go out the electric current with value with the electric current of the laser of luminescence unit, for the laser diode current of current detecting unit detection luminescence unit
Size, current sampling signal is sent to control unit after the current detecting unit detection laser electric current；If laser
Luminous power system setting value, then to control unit after the laser diode current size of current detecting unit detection luminescence unit
Send current sampling signal；
C) current sampling signal that control unit is sent according to current detecting unit judges whether the electric current of laser exceedes
Normal current value, if not less than normal current value, repeat step a) and b)；If it exceeds normal current value, then control is single
The current sampling signal that member is sent according to current detecting unit detection, judge that the electric current of laser exceedes the electric current of laser
Absolute rated value, control unit send laser ageing pre-warning signal；
D) the temperature setting reference signal for the optical module that control unit can also detect according to temperature detecting unit, temperature inspection
Survey the temperature of control chip unit detecting system and produce temperature signal and be transferred to control unit, described control unit is set for relevant temperature
Simultaneously output reference signal to feedback unit, the feedback unit believes the sampling of luminous power detection unit to corresponding reference signal
Number and reference signal be compared generation control signal, the control signal is exported to current control unit, the current control
Unit controls the operating current of laser in luminescence unit according to control signal, to control the luminous power of laser to return to system
Setting value.Compared using prior art after technical scheme, the present invention possesses following advantage and beneficial effect：
1. the control in the present invention, can be according to per a by the way of control unit CPU (single-chip microcomputer) intelligent control
The characteristic of laser carries out intelligent control, ensures that Output optical power is stable stable in 0.5dB change models in high/low temperature -40~85 degree
Within enclosing.
2. in the present invention, reference voltage setting can be carried out by CPU (single-chip microcomputer), it is not necessary to which artificial mechanism adjusts, special
Not in research and development and production, operating efficiency is greatly improved.
3. in the present invention, the luminous power of laser can in real time be detected by CPU (single-chip microcomputer), in the algorithm may be used
To set a thresholding, when detection luminous power be more than or less than setting scope, begin to alarm, when luminous power be more than setting
Scope, CPU (single-chip microcomputer) closes laser by way of setting reference voltage, prevents laser from burning out.
4. in the present invention, can be detected in real time to laser works electric current by CPU (single-chip microcomputer), inspection can be combined
The size of laser optical power is surveyed, the performance of laser is assessed, particularly its degree of aging, can be judged with combination algorithm
Go out the life-span of laser, and give warning in advance, allow engineering staff to change optical module in advance, prevent system crash.
5. in the present invention, being integrated with current foldback circuit, when can preventing that CPU software from defect occur and collapsing, have
Effect protection laser is burnt due to excessive electric current.
6. in the present invention, integrated temperature detection unit, the real-time read module operating temperatures of CPU, when temperature is too low or too high,
CPU will turn off laser, and protection laser preserves from.
7. in the present invention, using CPU (single-chip microcomputer) technology, to laser optical power, the operating current and benchmark of laser
Voltage, detected and adjusted, can be tested completely using ATS (automatization test system) in research and development and production, no
Manually test, drastically increase operating efficiency.
Brief description of the drawings
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 line, 103-capacitance, 104-micro-strip matched line, 105-swash
Light device LD, 106-optical fiber, 107-current control unit, 108-current detecting unit, 109-current foldback circuit, 110-
D/A converting circuit, 111-negative/positive pressure change-over circuit, 112-integration negative-feedback circuit, 113-isolated location, 114-
Cpu circuit, 115-amplifying circuit, 116-circuit line, the backlight detector PD of 117-laser, 118-temperature detection list
Member, 119-I2C interface circuit, 120-sampling resistor, 121-broadband inductor.
Embodiment
The invention will be further described with reference to the accompanying drawings and examples.
Embodiment one
The implementation of the present invention sees Fig. 2, mainly includes RF input ports 101, microstrip line 102, capacitance 103, micro-strip
Distribution 104, laser LD105, backlight detector PD 117, circuit line 116, broadband inductor 121, the sampling resistor of laser
120th, current control unit 107, current detecting unit 108, current foldback circuit 109, negative/positive pressure change-over circuit 111, digital-to-analogue
Change-over circuit 110, integration negative-feedback circuit 112, isolated location 113, cpu circuit 114, amplifying circuit 115 and temperature detection list
Member 118.
Microwave signal inputs from RF input ports 101, is transmitted by microstrip line 102, it is necessary to the blocking of capacitance 103, with
The DC voltage for isolating the optical power control system of optical module avoids being passed through capacitance 103 by external action, microwave signal
Afterwards, it is modulated at by micro-strip matched line 104 on laser LD105, the laser signal after modulation is exported by optical fiber 106, is swashed
When light device LD105 works, there is laser output at the back side simultaneously, is transferred on the backlight detector PD117 of laser, the back of the body of laser
Photodetector PD117 produces electric current, and sampling resistor 120 is transferred to by circuit line 116, is produced on sampling resistor 120 corresponding
Voltage namely sampled signal, this voltage is proportional with the electric current of sampling resistor 120, and the electric current of sampling resistor 120 with
The backlight detector PD117 of laser detects that laser power is relevant, when laser power is bigger, the electric current of its sampling resistor 120
It is bigger and proportional, then, caused voltage is directly proportional with laser LD105 luminous power on sampling resistor 120
Relation；Caused voltage namely sampled signal are sent to isolated location 113 on sampling resistor 120, and the two isolated locations play
Buffer action, the voltage exported from isolated location 113 is constant, and isolated location 113 is mainly to prevent circuit below from influenceing sampling
Caused voltage on resistance 120.
By the voltage of a branch road isolated location 113, it is input to amplifying circuit 115 and is amplified, be then input to negative
On pressure/malleation change-over circuit 111, negative pressure is switched to malleation, its absolute value is constant, and the malleation after changing is input to digital-to-analogue conversion
It is converted into data signal after circuit 110 to input to cpu circuit 114, this branch road is substantially carried out luminous power detection, the CPU electricity
Road 114 sets reference voltage to export to integration negative-feedback circuit 112 according to voltage；Two will be set in the algorithm of cpu circuit 114
Individual thresholding, one is high threshold, another low threshold, as long as exceeding the two thresholdings, cpu circuit 114 just produces an announcement
It is alert, external equipment is transferred to by I2C circuits 133.
By the voltage of another branch road isolated location 113, into integration negative-feedback circuit 112, this integration is negative anti-for input
It is the reference voltage that cpu circuit 114 is set that current feed circuit 112, which also has an input signal, and the reference voltage is by cpu circuit
114 produce, and integration negative-feedback circuit 112, which is compared two input voltages and integrate, produces a control signal, described
The output of integration negative-feedback circuit 112 is connected with current control unit 107, and current control unit 107 receives integration negative-feedback electricity
The laser LD105 controlled after control signal caused by road 112 electric current, also just control laser LD105 input current
Size, when threshold value of the electric current more than laser LD105 will send laser, electric current is bigger, and its Output optical power is bigger, and electric current is got over
Small luminous power is smaller.
Current sampling signal caused by current detecting unit 108 is exported to digital-to-analogue by negative/positive pressure change-over circuit 111 to be turned
Circuit 110 is changed, the D/A converting circuit 110 is connected with cpu circuit 114, by analog signal system in D/A converting circuit 110
Output is electric to cpu circuit 114, the CPU after the current sampling signal of formula is converted into the current sampling signal of data signal standard
Road 114 sets reference voltage according to current sampling signal and exported to integration negative-feedback circuit 112, integrates negative-feedback circuit 112
Two input voltages be compared and integrate produce a control signal, it is described integration negative-feedback circuit 112 output with
Power control unit 111 is connected, and power control unit 111 controls after receiving control signal caused by integration negative-feedback circuit 112
Laser LD105 electric current, laser LD105 size of current is also just controlled, when electric current exceedes the threshold value of laser just
Laser can be sent, electric current is bigger, and its Output optical power is bigger, and the smaller luminous power of electric current is smaller.
The temperature sensor 150 is connected with cpu circuit 114, and produces temperature signal and be transferred to cpu circuit 114, CPU
Circuit 114 sets reference voltage according to temperature signal, and transmits to integration negative-feedback unit 123, integrates negative-feedback circuit 112
Two input voltages, which are compared and integrated, produces a control signal, the output of the integration negative-feedback circuit 112 and electricity
Source control unit 111 is connected, and is controlled after control signal caused by the reception integration negative-feedback circuit 112 of power control unit 111
Laser LD105 electric current, laser LD105 size of current is also just controlled, the threshold value that laser is exceeded when electric current will
Laser is sent, electric current is bigger, and its Output optical power is bigger, and the smaller luminous power of electric current is smaller.
Embodiment two
The embodiment of the present invention two is shown in Fig. 3, mainly include RF input ports 101, capacitance 103, micro-strip matched line 104, swash
Light device LD105, the backlight detector PD 117 of laser, broadband inductor 121, sampling resistor 120, current control unit 107, electricity
Flow detection 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.
Microwave signal inputs from RF input ports 101, is transmitted by microstrip line 102, it is necessary to the blocking of capacitance 103, with
The DC voltage for isolating the optical power control system of optical module avoids being passed through capacitance 103 by external action, microwave signal
Afterwards, it is modulated at by micro-strip matched line 104 on laser LD105, the laser signal after modulation is exported by optical fiber 106, is swashed
When light device LD105 works, there is laser output at the back side simultaneously, is transferred on the backlight detector PD117 of laser, the back of the body of laser
Photodetector PD117 produces electric current, and sampling resistor 120 is transferred to by circuit line 116, is produced on sampling resistor 120 corresponding
Voltage namely sampled signal, this voltage is proportional with the electric current of sampling resistor 120, and the electric current of sampling resistor 120 with
The backlight detector PD117 of laser detects that laser power is relevant, when laser power is bigger, the electric current of its sampling resistor 120
It is bigger and proportional, then, caused voltage is directly proportional with laser LD105 luminous power on sampling resistor 120
Relation；Caused voltage namely sampled signal are sent to isolated location 113 on sampling resistor 120, and isolated location plays isolation and made
With the voltage exported from isolated location 113 is constant, and isolated location 113 is mainly to prevent circuit below from influenceing sampling resistor 120
Voltage caused by upper.
By the voltage of a branch road isolated location 113, it is input to amplifying circuit 115 and is amplified, be then input to number
It is converted into data signal after analog conversion circuit 110 to input to cpu circuit 114, the cpu circuit 114 is according to voltage setting benchmark
Voltage output extremely integrates negative-feedback circuit 112；It is that cpu circuit 114 is set to integrate negative-feedback circuit 112 to also have an input signal
Reference voltage, the reference voltage is produced by cpu circuit 114, integration negative-feedback circuit 112 two input voltages are carried out
Compare and integrate and produce a control signal, the output of the integration negative-feedback circuit 112 and the phase of current control unit 107
Even, current control unit 107 receives the laser LD105 controlled after control signal caused by integration negative-feedback circuit 112 electricity
Stream, also just control laser LD105 input current size, when threshold value of the electric current more than laser LD105 will send it is sharp
Light, electric current is bigger, and its Output optical power is bigger, and the smaller luminous power of electric current is smaller；Two will be set in the algorithm of cpu circuit 114
Thresholding, one is high threshold, another low threshold, as long as exceeding the two thresholdings, cpu circuit 114 just produces an alarm,
External equipment is transferred to by I2C circuits 233.
By the voltage of another branch road isolated location 113, into integration negative-feedback circuit 112, this integration is negative anti-for input
It is the reference voltage that cpu circuit 114 is set that current feed circuit 112, which also has an input signal, and the reference voltage is by cpu circuit
114 produce, and integration negative-feedback circuit 112, which is compared two input voltages and integrate, produces a control signal, described
The output of integration negative-feedback circuit 112 is connected with current control unit 107, and current control unit 107 receives integration negative-feedback electricity
The laser LD105 controlled after control signal caused by road 112 electric current, also just control laser LD105 input current
Size, when threshold value of the electric current more than laser LD105 will send laser, electric current is bigger, and its Output optical power is bigger, and electric current is got over
Small luminous power is smaller.
Current sampling signal caused by current detecting unit 108 is exported to D/A converting circuit 110, the digital-to-analogue conversion electricity
Road 110 is connected with cpu circuit 114, is converted into counting by the current sampling signal of analog signal standard in D/A converting circuit 110
Output to cpu circuit 114, the cpu circuit 114 is set according to current sampling signal after the current sampling signal of word signaling mode
Reference voltage is simultaneously exported to integration negative-feedback circuit 112, integration negative-feedback circuit 112 two input voltages are compared and
Integration produces a control signal, and the output of the integration negative-feedback circuit 112 is connected with power control unit 211, power supply control
Unit 211 processed receives the laser LD105 controlled after control signal caused by integration negative-feedback circuit 112 electric current, also just controls
Laser LD105 size of current is made, the threshold value of laser is exceeded when electric current will send laser, its bigger output light of electric current
Power is bigger, and the smaller luminous power of electric current is smaller.
The temperature detecting unit 118 is connected with cpu circuit 114, and produces temperature signal and be transferred to cpu circuit 114,
Cpu circuit 114 sets reference voltage according to temperature signal, and transmits to integration negative-feedback unit 223, integrates negative-feedback circuit
112 two input voltages, which are compared and integrated, produces a control signal, the output of the integration negative-feedback circuit 112
It is connected with power control unit 211, power control unit 211 is controlled after receiving control signal caused by integration negative-feedback circuit 112
The laser LD105 of system electric current, laser LD105 size of current is also just controlled, when electric current exceedes the threshold value of laser
Laser will be sent, electric current is bigger, and its Output optical power is bigger, and the smaller luminous power of electric current is smaller.
Compared using prior art after embodiments of the invention, the present embodiment possesses following advantage and beneficial effect：
1. the control in the present invention, can be according to per a by the way of control unit CPU (single-chip microcomputer) intelligent control
The characteristic of laser carries out intelligent control, ensures that Output optical power is stable stable in 0.5dB change models in high/low temperature -40~85 degree
Within enclosing.
2. in the present invention, reference voltage setting can be carried out by CPU (single-chip microcomputer), it is not necessary to which artificial mechanism adjusts, special
Not in research and development and production, operating efficiency is greatly improved.
3. in the present invention, the luminous power of laser can in real time be detected by CPU (single-chip microcomputer), in the algorithm may be used
To set a thresholding, when detection luminous power be more than or less than setting scope, begin to alarm, when luminous power be more than setting
Scope, CPU (single-chip microcomputer) closes laser by way of setting reference voltage, prevents laser from burning out.
4. in the present invention, can be detected in real time to laser works electric current by CPU (single-chip microcomputer), inspection can be combined
The size of laser optical power is surveyed, the performance of laser is assessed, particularly its degree of aging, can be judged with combination algorithm
Go out the life-span of laser, and give warning in advance, allow engineering staff to change optical module in advance, prevent system crash.
5. in the present invention, being integrated with current foldback circuit, when can preventing that CPU software from defect occur and collapsing, have
Effect protection laser is burnt due to excessive electric current.
6. in the present invention, integrated temperature detection unit, the real-time read module operating temperatures of CPU, when temperature is too low or too high,
CPU will turn off laser, and protection laser preserves from.
7. in the present invention, using CPU (single-chip microcomputer) technology, to laser optical power, the operating current and benchmark of laser
Voltage, detected and adjusted, can be tested completely using ATS (automatization test system) in research and development and production, no
Manually test, drastically increase operating efficiency.
The foregoing description of the disclosed embodiments, professional and technical personnel in the field are enable to realize or using the present invention,
A variety of modifications to these embodiments are it will be apparent that as defined herein one for those skilled in the art
As principle can realize in other embodiments without departing from the spirit or scope of the present invention.Therefore, the present invention will
It will not be intended to be limited to the embodiments shown herein, and be to fit to consistent with principles disclosed herein and features of novelty
Widest range.
Claims (11)
- A kind of 1. optical power control system of optical module, it is characterised in that including：Signal receiving unit, for receiving microwave signal and exporting microwave signal to luminescence unit；Luminescence unit, including laser, to receive microwave signal, laser signal of the output by microwave signal modulation；Luminous power detection unit, the luminous power backwards of detection luminescence unit laser simultaneously produce sampled signal；Isolated location, amplifying circuit, feedback unit are isolated with luminous power detection unit, prevent amplifying circuit and feedback Unit influences sampled signal caused by luminous power detection unit；Amplifying circuit, sampled signal caused by luminous power detection unit is amplified；Current detecting unit, detects the laser diode current size of luminescence unit, and sends current sampling signal to control unit；Temperature detecting unit, the temperature of detecting system simultaneously produce temperature signal and are transferred to control unit；Feedback unit, luminescence unit is controlled according to the comparative result of the sampled signal of luminous power detection unit and reference signal The power output of laser signal；Current control unit, the control signal exported according to feedback unit control the operating current of laser in luminescence unit, institute Current control unit is stated simultaneously to current detecting unit output and the electric current of the same value of operating current of laser；Control unit, the temperature setting reference signal of the optical module detected according to temperature detecting unit；According to current detecting unit The life-span that the current sampling signal sent judges laser is detected, decides whether to send pre-warning signal；Detected according to luminous power The laser of unit detection sets reference signal backwards to sampled signal caused by luminous power；The signal receiving unit is connected with luminescence unit, microwave signal enter from signal receiving unit after to luminescence unit, Microwave signal exports after being modulated to laser signal in luminescence unit；The luminescence unit and luminous power detection unit phase Even, the luminous power detection unit is connected with isolated location, the luminous power backwards of luminous power detection unit detection laser And produce sampled signal and export to isolated location, by the way that sampled signal is exported to amplifying circuit all the way after isolated location, amplifying Output is to control unit after sampled signal caused by luminous power detection unit is amplified in circuit, and control unit is according to adopting Sample signal sets reference signal to export to feedback unit；Exported by another way sampled signal after isolated location to feedback unit, The feedback unit is connected with current control unit, and feedback unit produces control according to the comparative result of sampled signal and reference signal Signal processed is simultaneously exported to current control unit, and the current control unit is connected with current detecting unit and luminescence unit, described The control signal that current control unit exports according to feedback unit produce all the way electric current to luminescence unit, the current control list The member output an equal amount of electric current of another way to current detecting unit, current detecting unit is connected with control unit, the electric current The size of current of detection unit detection laser simultaneously produces current sampling signal and exported to control unit, and control unit is according to electric current Sampled signal sets reference signal and exported to feedback unit；The temperature detecting unit is connected with control unit, and produces temperature Degree signal is transferred to control unit, and control unit sets reference signal according to temperature signal and exported to feedback unit.
- A kind of 2. optical power control system of optical module as claimed in claim 1, it is characterised in that the signal receiving unit Including：RF input ports (101), microstrip line (102), capacitance (103) and broadband inductor (121)；Microwave signal inputs from RF Mouth (101) input, is transmitted by microstrip line (102), by being output to luminescence unit, the broadband electricity after capacitance (103) (121) are felt to prevent microwave signal from entering current control unit.
- A kind of 3. optical power control system of optical module as claimed in claim 1 or 2, it is characterised in that described luminous list Member includes：Micro-strip matched line (104), laser LD (105) and optical fiber (106)；The microwave signal inputted by capacitance (103) It is modulated at by micro-strip matched line (104) on laser LD (105), laser signal caused by laser LD (105) passes through optical fiber (106) export.
- A kind of 4. optical power control system of optical module as claimed in claim 3, it is characterised in that the luminous power detection The luminous power backwards and caused sampled signal of unit detection laser signal are voltage signals；The luminous power detection unit bag Include：The backlight detector PD (117) and sampling resistor (120) of laser；When laser LD (105) produces laser signal, laser The laser at device LD (105) back side is transferred on the backlight detector PD (117) of laser, now, the backlight detector of laser Electric current caused by PD (117) is transferred to sampling resistor (120) by circuit line (116), is produced on sampling resistor (120) corresponding Voltage signal, the voltage signal isolated, prevents from amplifying by isolated location (113) with amplifying circuit (115) and feedback unit Circuit (115) and feedback unit influence to produce corresponding voltage signal on sampling resistor (120).
- 5. a kind of optical power control system of optical module as claimed in claim 4, it is characterised in that described control unit is set Reference signal be reference voltage signal；The feedback unit is to integrate negative-feedback circuit (112), the integration negative-feedback circuit (112) input voltage all the way is that the voltage signal of the sampling resistor (120) of luminous power detection unit passes through isolated location (113) voltage signal of input；Another way input voltage is the reference voltage signal that control unit is set；The integration negative-feedback Circuit (112) is compared two input voltages and integrates one control voltage signal of output to current control unit (107)。
- A kind of 6. optical power control system of optical module as claimed in claim 5, it is characterised in that integration negative-feedback circuit (112) control voltage signal of output is exported to the current control unit (107), current control unit (107) basis The control voltage signal of integration negative-feedback circuit (112) output produces electric current all the way to the laser LD (105) of luminescence unit, To control the luminous power of laser LD (105), an equal amount of electric current of current control unit (107) the output another way is extremely Current detecting unit (108) is with the size of current of detection laser LD (105).
- 7. a kind of optical power control system of optical module as claimed in claim 6, it is characterised in that described control unit includes Cpu circuit (114), D/A converting circuit (110), two groups of negative/positive pressure change-over circuits (111)；One group of negative/positive pressure conversion electricity The output of the input on road (111) and amplifying circuit (115) is connected, the sampled signal that the amplifying circuit (115) exports by negative pressure/ Malleation change-over circuit (111) is exported to D/A converting circuit (110), the D/A converting circuit (110) and cpu circuit (114) It is connected, the sampling that the sampled signal of analog signal standard is converted into data signal standard in D/A converting circuit (110) is believed Output to cpu circuit (114), the cpu circuit (114) sets reference signal to export to integration and born instead according to sampled signal after number Current feed circuit (112)；The input of another group of negative/positive pressure change-over circuit (111) is connected with current detecting unit (108) output, institute State current sampling signal caused by current detecting unit (108) and pass through negative/positive pressure change-over circuit (111) output to digital-to-analogue conversion Circuit (110), the D/A converting circuit (110) are connected with cpu circuit (114), will simulation in D/A converting circuit (110) The current sampling signal of signaling mode is exported to cpu circuit (114), institute after being converted into the current sampling signal of data signal standard Cpu circuit (114) is stated to set reference signal according to current sampling signal and export extremely by negative/positive pressure change-over circuit (111) Integrate negative-feedback circuit (112)；The temperature detecting unit (118) is connected with cpu circuit (114), and produces temperature signal biography Cpu circuit (114) is defeated by, cpu circuit (114) sets reference signal according to temperature signal and passes through negative/positive pressure change-over circuit (111) output extremely integration negative-feedback circuit (112).
- 8. a kind of optical power control system of optical module 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 of amplifying circuit (115) output is exported to digital-to-analogue conversion Circuit (110), the D/A converting circuit (110) are connected with cpu circuit (114), will simulation in D/A converting circuit (110) Output is electric to cpu circuit (114), the CPU after the sampled signal of signaling mode is converted into the sampled signal of data signal standard Road (114) sets reference signal to export to integration negative-feedback circuit (112) according to sampled signal；The current detecting unit (108) current sampling signal caused by is exported to D/A converting circuit (110), the D/A converting circuit (110) and cpu circuit (114) it is connected, the current sampling signal of analog signal standard is converted into data signal standard in D/A converting circuit (110) Current sampling signal after output to cpu circuit (114), the cpu circuit (114) sets benchmark to believe according to current sampling signal Number and export to integration negative-feedback circuit (112)；The temperature detecting unit (118) is connected with cpu circuit (114), and produces Temperature signal is transferred to cpu circuit (114), and cpu circuit (114) sets reference signal according to temperature signal and exported negative to integrating Feedback circuit (112).
- A kind of 9. optical power control system of optical module as described in any claim of claim 7 or 8, it is characterised in that Described control unit also includes I2C interface circuit (119), and the I2C interface circuit (119) is connected with cpu circuit (114), institute I2C interface circuit can be passed through by I2C interface circuit (119) with external device communication or external equipment by stating control unit (119) work of cpu circuit (114) is controlled.
- A kind of 10. optical power control system of optical module as claimed in claim 9, it is characterised in that the optical power control System also includes current foldback circuit (109), burns laser LD (105) to prevent laser LD (105) electric current excessive.
- 11. a kind of control method of the optical power control system of optical module as claimed in claim 1, methods described includes as follows Step：A) luminous power detection unit detects the luminous power backwards of the laser of luminescence unit and produces sampled signal, described luminous Sampled signal caused by power detecting unit is transmitted to feedback unit；B) sampled signal of luminous power detection unit and reference signal are compared by the feedback unit, judge laser Luminous power whether system setting value, if the luminous power of laser, not in the setting value of system, feedback unit produces Control signal is simultaneously exported to current control unit, and the current control unit adjusts the electric current of laser according to control signal, with The luminous power of control laser returns to default value, and the current control unit is exported and sent out to current detecting unit simultaneously The electric current of the same value of the electric current of the laser of light unit, so that current detecting unit detects the laser diode current size of luminescence unit, After the current detecting unit detection laser electric current current sampling signal is sent to control unit；If the luminous work(of laser Rate then to control unit sends electricity in the setting value of system after the laser diode current size of current detecting unit detection luminescence unit Flow sampled signal；C) it is normal to judge whether the electric current of laser exceedes for the current sampling signal that control unit is sent according to current detecting unit Current value, if not less than normal current value, repeat step a) and b)；If it exceeds normal current value, then control unit root The current sampling signal sent according to current detecting unit detection, judge that the electric current of laser exceedes the absolute of the electric current of laser Rated value, control unit send laser ageing pre-warning signal；The temperature setting reference signal for the optical module that control unit can also detect according to temperature detecting unit, temperature detecting unit The temperature of detecting system simultaneously produces temperature signal and is transferred to control unit, and described control unit sets corresponding for relevant temperature Reference signal and output reference signal are to feedback unit, and the feedback unit is by the sampled signal and base of luminous power detection unit Calibration signal is compared generation control signal, and the control signal is exported to current control unit, the current control unit root The operating current of laser in luminescence unit is controlled according to control signal, to control the luminous power of laser to return to default Value.
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| CN106404168B (en) * | 2016-09-29 | 2018-01-23 | 北京市计量检测科学研究院 | A kind of method for obtaining laser power meter different wave length correction factor |
| CN107888170A (en) * | 2016-09-30 | 2018-04-06 | 江汉大学 | One kind interval Exciting-simulator system lasing light emitter |
| CN106785838A (en) * | 2016-12-16 | 2017-05-31 | 武汉锐科光纤激光技术股份有限公司 | Portable hand-held 80W jointed fiber Optical Maser Systems |
| CN111835429B (en) * | 2020-08-04 | 2021-11-09 | 国家电网有限公司信息通信分公司 | Optical module, method for correcting transmitting optical power of optical module and controller |
| CN113959492B (en) * | 2021-10-22 | 2023-01-10 | 苏州森峰智能装备有限公司 | Light path protection monitoring system of self-adaptation threshold value |
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