CN110417475A - A kind of electrical-optical conversion module bias point without spuious locking system and method - Google Patents
A kind of electrical-optical conversion module bias point without spuious locking system and method Download PDFInfo
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- CN110417475A CN110417475A CN201910592297.8A CN201910592297A CN110417475A CN 110417475 A CN110417475 A CN 110417475A CN 201910592297 A CN201910592297 A CN 201910592297A CN 110417475 A CN110417475 A CN 110417475A
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- electrical
- optical conversion
- spuious
- conversion module
- modulator
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
- H04B10/075—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
- H04B10/079—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using measurements of the data signal
- H04B10/0799—Monitoring line transmitter or line receiver equipment
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/50—Transmitters
- H04B10/501—Structural aspects
- H04B10/503—Laser transmitters
- H04B10/505—Laser transmitters using external modulation
- H04B10/5057—Laser transmitters using external modulation using a feedback signal generated by analysing the optical output
- H04B10/50575—Laser transmitters using external modulation using a feedback signal generated by analysing the optical output to control the modulator DC bias
Abstract
The present invention relates to a kind of electrical-optical conversion module bias points without spuious locking system and method, for realizing to electrical-optical conversion module bias point without spuious stability contorting and tracking, the optical power of light emitting portion and electrical-optical conversion portion is extracted simultaneously, logic feedback control is carried out, is controlled with realizing without spuious modulator stabilization of operating point.Compared with the control mode of traditional power method and pilot tone system, it both ensure that and do not introduced in optics intrinsic signals spuious, and ensured that signal has higher degree, while having ensured the precision at control point again, do not introduced error with light source performance change.
Description
Technical field
RF application (ROF) is carried the present invention relates to optical communication field, microwave photon field and light more particularly to electrical-optical turns
Change the mold block bias point without spuious locking system and method.
Background technique
With increasingly mature, the mass data of optic communication and the continuous development of Microwave photonics and photoelectric device manufacturing technology
It is transmitted with information by light.Electrical-optical conversion module main function is the optical signal that the electric signal of modulation is converted to modulation.
The basic composition of electrical-optical conversion module includes light emitting portion, electrical-optical conversion portion, logic control element in the prior art.Light
Emitting portion is mainly made of the laser as light source and the back light detector for carrying out optical power detection to laser；
Electrical-optical conversion portion is mainly by the modulator converted as electrical-optical and the inspection detected to modulator Output optical power
Detector is surveyed to constitute；Logic control element main function is to carry out logic control to light emitting portion and electrical-optical conversion portion.
Optical modulator is only locked to quadrature bias point, could make light tune as the core devices for realizing electrical-optical conversion
Device work processed is being stablized in modulating range, to realize correct, high quality, low distortion optical signal.Under quadrature bias point,
Electrical-optical converts fundamental signal maximum intensity, and 2 rank signal strengths are minimum, and ratio reaches maximum value.But modulator, especially niobium
Sour lithium material modulator, behind applied bias operating point, adjustment curve still may be with extraneous stress, temperature, charge accumulated etc.
Factor is drifted about, and the precision and stability of entire electrical-optical conversion module is influenced.
The control method of existing logic control element mainly has power method and pilot tone system two ways.Such as United States Patent (USP)
US8160456 discloses a kind of utilize and is modulated device stability contorting by algorithm record detection modulator Output optical power
Poewr control method, but the method not can avoid the mistake due to the aging of modulator part or the introducing of light emitting portion changed power
Difference.Chinese patent CN104639252, United States Patent (USP) US8175465 disclose the method using pilot tone system to modulator control, main
Low frequency modulations (dither) signal loading is generated by outside into modulator, then mentioned the signal using detection detector
After taking, logic real-time control is carried out.Pilot tone system can change the error introduced to avoid light emitting portion, but due to low frequency modulations
Signal is added and introduces spurious signal, has an impact to modulation spectral purity and precision.
Summary of the invention
In order to overcome the shortcomings of the prior art, the invention proposes a kind of electrical-optical conversion module bias points without miscellaneous
Locking system and method are dissipated, for realizing, without spuious stability contorting and tracking, extracting simultaneously to electrical-optical conversion module bias point
The optical power of light emitting portion and electrical-optical conversion portion carries out logic feedback control, to realize without spuious modulator operating point
Stability contorting.
First aspect present invention be to provide a kind of electrical-optical conversion module bias point without spuious locking system, comprising: light hair
Penetrate drive part, logical process part and electrical-optical conversion drive part.The light emitting drive part and electrical-optical conversion module
Light emitting portion be connected, realize the driving of light emitting portion；Electrical-optical conversion drive part mainly with electrical-optical modulus of conversion
Electrical-optical conversion portion in block is connected, and realizes the driving of electrical-optical conversion portion；Logical process part, according to light emitting portion and
The working condition of electrical-optical conversion portion carries out real-time feedback control.
Further, above-mentioned electrical-optical conversion module bias point without spuious locking system, wherein the light emitting is driven
Dynamic part mainly includes laser driving and current detecting part.Laser driving effect is to provide the driving current of laser,
It can be DA circuit or associated analog；Current detecting part sorting surveys the photogenerated current signal of back light detector, can be AD
Circuit or associated analog.
The wherein logical process part mainly includes microprocessor and data storage.Microprocessor effect is real
The logic control of existing electrical-optical conversion module, can be the programmable logic device such as single-chip microcontroller, FPGA, CPLD.Data storage master
Realize the status data storage of electrical-optical conversion module.
Wherein the electrical-optical converts drive part, mainly includes current detecting, modulator driving and jitter generator.
Current detecting effect is to realize to detect modulator output power, can be AD or associated analog；Modulator driving effect
It is to be driven to the bias point of modulator, can be DA or associated analog, jitter generator effect is that generation is faint low
Frequency dither signal.
Second aspect of the present invention is to provide a kind of software realization side without spuious locking of electrical-optical conversion module bias point
Method, comprising: initialization self-test, intrinsic parameters table are established, operating point is detected and rebuild without spuious control and state of a control.
The wherein initialization self-test part is to realize electrical-optical conversion module light emitting portion and electrical-optical conversion respectively
Partial function self-test.Include laser diode current load, modularot voltage scanning, back light detector detection and detection detector inspection
It surveys.
Wherein the intrinsic parameters table is established, and effect is visited to modulator Output optical power, laser optical power, detection
Survey 1 rank intensity of dither signal, 2 rank intensity of dither signal loads the foundation of scanning voltage value corresponding data table with modulator.
Wherein the operating point refers under dither signal closed state without spuious control, according to back light detector and
Detector data ratio is detected, bias voltage adjustment amount is calculated by intrinsic parameters meter, modulator bias voltage is repaired
Just, the real-time voltage feedback control of electrical-optical conversion module is then formed.
Whether wherein state of a control detection and reconstruction, mainly work to electrical-optical conversion module working bias voltage
Optimum point carries out interim detection, mainly includes that dither signal starts, to modulator Output optical power, laser optical power, trembles
Dynamic 1 rank intensity of signal, 2 rank intensity of dither signal are detected, and carry out parameter comparison with intrinsic data table, such as beyond threshold value into
Row Refresh Data then keeps initial data constant without departing from threshold value.
Electrical-optical conversion module bias point of the present invention without spuious locking system and method, turn for realizing electrical-optical
Bias point is real-time without spuious feedback control in mold changing block.Compared with the control mode of traditional power method and pilot tone system, both protected
It has demonstrate,proved and has not been introduced in optics intrinsic signals spuious, ensured that signal has higher degree, while having ensured the precision at control point again,
Error is not introduced with light source performance change.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is the present invention
Some examples for those of ordinary skill in the art without creative efforts, can also be according to this
A little attached drawings obtain other attached drawings.
Fig. 1: electrical-optical conversion module bias point of the invention without spuious locking system
Fig. 2: the software implementation method flow chart without spuious locking of electrical-optical conversion module bias point of the invention
Fig. 3: the initialization self-test flow chart of electrical-optical conversion module of the invention
Fig. 4: the intrinsic data table Establishing process figure of electrical-optical conversion module of the invention
Fig. 5: the operating point of electrical-optical conversion module of the invention is without spuious control flow chart
Fig. 6: the state of a control detection of electrical-optical conversion module of the invention and reconstruction flow chart.
Fig. 7: Figure of abstract, content are the software implementation method without spuious locking of electrical-optical conversion module bias point of the invention
Flow chart
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction in present example
Attached drawing, clear, complete description is carried out to the technical solution in present example.Obviously, described embodiment is this hair
Bright a part of the embodiment, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art are not having
Every other embodiment obtained under the premise of creative work is made, shall fall within the protection scope of the present invention.
In embodiments of the present invention, the direct current biasing to make Mach-Zenhnder intensity light modulation in electrical-optical conversion module
Bias point be located at quadrature bias point on adjustment curve, and can be realized stable tracking lock with external environmental condition variation,
It needs to find and modulates bias point corresponding amount on point curve, and form corresponding data table, offset voltage is obtained by calculation, it will be inclined
Voltage superposition is moved to bias voltage, realizes the feedback regulation to quadrature bias point.To ensure work long hours stability and letter
Number purity, the corresponding amount of selected bias point should be unrelated with light emitting portion output power and injection RF signal power,
And dither signal is not introduced when biasing control.
As shown in Figure 1, being a kind of basic composition without spuious locking system of electrical-optical conversion module bias point, wherein wrapping
Logical process part 1, light emitting drive part 2 are included, electrical-optical converts drive part 3.
Logical process part 1 is key control unit, using microprocessor 101, such as using chip microcontroller to light emitting
Feedback control is carried out with electrical-optical conversion portion working condition, forms control closed loop；Data storage 102, to light emitting and electricity-
The status data of light conversion is stored, the main corresponding amount tables of data for storing bias point.
Light emitting drive part 2 is used to form feedback control to light emitting portion, includes laser driving 201 and electric current inspection
Survey 202.It is to realize to control laser Injection Current size and realize using DA to backlight using AD and amplifier that it, which is acted on respectively,
Detector exports the detection of electric current, to realize the detection of optical output power of laser and ensure that optical power output is stablized.
Electrical-optical converts drive part 3, for forming feedback closed loop control to electrical-optical conversion portion.Modulator bias voltage
It is realized using modulator driving 302 by DA, and added together with the dither signal that jitter generator 303 generates by wave multiplexer
It is downloaded to modulator input terminal.Current detecting 301 realizes that the output electric current to detection detector is measured in real time, and is detected by AD
Modulator Output optical power.
The design principle thinking without spuious locking means of electrical-optical conversion module bias point are as follows: with laser and Mach-
For Zenhnder modulator composition, modulator Output optical powerP o With light emitting Output optical powerP LD , half-wave voltageV π , biasing
VoltageV B Relationship are as follows:
After additional jitter generator 303 load perturbation signal loads together with the offset signal of modulator driving 302, from electric current
Luminous intensity in detection 301 after available electrical-optical conversion includes 0 frequency luminous intensityP o , 1 rank signal strengthP mod And 2 rank letter
Number intensityP NL2 Are as follows:
Find out from above formula, passes throughP mod / P NL2 Quadrature bias point can be exactly found by searching this method of maximum value, be realized
The electrical-optical transfer efficiency of high linearity, passes throughP mod / P NL2 With bias voltageV B Corresponding relationship parameter list calculate it is corresponding inclined
Move voltageV b , then it is superimposed to bias voltageV B On.But this method needs to introduce dither signal, draws to the modulation spectrum of modulator
Enter spuious, influences electrical-optical conversion signal quality and purity, simultaneouslyP mod / P NL2 With modulation input signal strengthV RF It is related, outside
It will affect control accuracy in the case of boundary's amount variation.
In the present invention, we are exactly found quadrature bias point and are established using load dither signalP mod / P NL2 WithP o /P LD And bias voltageV B Intrinsic relation table between three, and in the case where dither signal is closed, it utilizesP o /P LD With biasing
VoltageV B Intrinsic parameters table, calculate offset voltageV b Be added to bias voltageV B On, realize the feedback to bias voltage
Closed loop adjust, achieve the purpose that non-jitter feedback regulation, may be implemented electrical-optical conversion module bias point without spuious locking.
Find out from formula,P o /P LD =1-cos(πV B /V π ) it can directly reflect modulator intrinsic parameters, with laser output light
PowerP LD With input radio frequency voltageV RF It is unrelated, more accurately feedback regulation may be implemented.
As shown in Fig. 2, being a kind of software flow without spuious locking of electrical-optical conversion module bias point, process are as follows: step
1, self-test is initialized, state-detection is carried out to electrical-optical conversion module each section.Step 2, intrinsic data table is established, and is believed in shake
Number starting and load condition under, scanning and acquisitionP o 、P LD 、P mod 、P NL2 With bias voltage, and table is established.Step 3, operating point
Without spuious control, under dither signal closed state, utilizeP o /P LD With bias voltageV B Intrinsic table to electrical-optical conversion module
Form feedback control.Step 4, whether state of a control detection and reconstruction, accurately supervise the state of a control of electrical-optical conversion module
Control carries out rescaning and establishing for intrinsic data table if changing.Step is executed if judging that larger change occurs for characteristic value
Rapid 2, if judging, characteristic value occurs smaller change and thens follow the steps 3.
As shown in figure 3, being electrical-optical conversion module software initialization self-test flow chart, it is therefore an objective to wherein laser, backlight
Detector, modulator, the working condition progress state-detection for detecting detector, judge whether working properly.Mainly comprising following
Step: step 1, laser diode current load drives 201 pairs of lasers to load scheduled driving current, generates electricity-using laser
The intrinsic optical signal of light conversion module.Step 2, back light detector photoelectric current detects, using current detecting 202 to back light detector
Photoelectric current detected, judge whether laser and back light detector working properly.Step 3, modularot voltage scans, and utilizes
Modulator drives 302 pairs of modulators to carry out bias voltage scanning.Step 4, detection detector photoelectric current detection, utilizes current detecting
301 pairs of detection detector photoelectric currents detect, and judge modulator and detection detector working condition.
As shown in figure 4, being the intrinsic table Establishing process figure of electrical-optical conversion module software, it is therefore an objective to establish each parameter and biasing
VoltageV B Correspondence intrinsic parameters table.Key step is as follows: step 1, starting jitter generator, generates dither signal, specifically
Generate the dither signal of 1 kHz, and with modulator bias voltageV B It is loaded into modulator input terminal together.Step 2, modulator is inclined
Set voltage scanning, scanning reticle bias voltageV B From minimum value to maximum value.Step 3, current detecting 301 and current detecting
202 carry out data acquisition, acquisition back light detector and the current value for detecting detector.Step 4, laser power is extractedP LD , adjust
Device output power processedP o , fundamental signalP mod (1 kHz), 2 rank signalsP NL2 The numerical value of (2 kHz).Step 5, it establishesP LD 、P o 、P mod 、P NL2 、P o /P LD 、P mod /P NL2 With bias voltageV B Corresponding table stores intrinsic data table into data storage 102.
As shown in figure 5, electrical-optical conversion module operating point without spuious control flow chart, is to realize the biasing of electrical-optical conversion module
Point feedback closed loop control, is loaded into bias voltage for the offset voltage of calculatingV B On, so that it is always worked at quadrature bias point electricity
Press position.Specific step is as follows: step 1, close dither signal, avoid to signal introduce it is spuious, influence signal quality.Step 2,
Quadrature bias point is set according to intrinsic table and corresponds to bias voltage value, and modulator is loaded by modulator driving 302.Step 3, root
According to current detecting 202 and current detecting 301, back light detector and detection detector current value are detected, laser output work is acquired
RateP LD And modulator output powerP o , and then acquire current state ratioP o /P LD .Step 4, offset electricity is acquired according to intrinsic data
PressureV b .Step 5, by offset voltageV b It is superimposed upon bias voltageV B , make modulator working condition to quadrature bias point.
As shown in fig. 6, being electrical-optical conversion module intrinsic parameters table overhaul flow chart, purpose is the standard to intrinsic parameters table
Exactness is timed detection, and judges whether to need to update intrinsic parameters value in intrinsic parameters table.Steps are as follows for software flow: step
Rapid 1, receive intrinsic parameters table trigger signal.Step 2, start jitter generator 303, generate dither signal, and by dither signal
It is loaded into modulator.Step 3, laser power is extractedP LD , modulator output powerP o , fundamental signalP mod , 2 rank signalsP NL2
Numerical value, and calculateP o /P LD WithP mod /P NL2 Numerical value.Step 4, it with data comparison in intrinsic data table, will obtainP o /P LD
WithP mod /P NL2 Numerical value is compared with intrinsic parameters table numerical value, and sees if fall out given threshold.If without departing from threshold value,
Judgement conclusion is to be not required to re-establish intrinsic data table, and carry out operating point without spuious control.If judgement exceeds threshold value, judge
Conclusion is to carry out re-establishing intrinsic data table, and carry out intrinsic data table foundation.
Claims (10)
1. a kind of electrical-optical conversion module bias point without spuious locking system, it is characterised in that: including light emitting drive part,
Logical process part and electrical-optical convert drive part；Wherein, the light of the light emitting drive part and electrical-optical conversion module is sent out
Part is penetrated to be connected；The electrical-optical conversion drive part is connected with the electrical-optical conversion portion in electrical-optical conversion module；Logical process
Part, while the Output optical power of light emitting portion and electrical-optical conversion portion is extracted, carry out real-time feedback control.
2. electrical-optical conversion module bias point as described in claim 1 without spuious locking system, it is characterised in that: it is described to patrol
Collecting processing unit point includes microprocessor and data storage；Microprocessor, the work to light emitting portion and electrical-optical conversion portion
State carries out feedback control, forms control closed loop；Data storage, to the status number of light emitting portion and electrical-optical conversion portion
According to being stored.
3. electrical-optical conversion module bias point as described in claim 1 without spuious locking system, it is characterised in that: the light
Transmitting drive part includes laser driving and current detecting, the current detecting are the photogenerated current signals to back light detector
It is detected；The electrical-optical conversion drive part includes current detecting, modulator driving and jitter generator, the electric current inspection
Survey is detected to modulator output power.
4. electrical-optical conversion module bias point as claimed in claim 2 without spuious locking system, it is characterised in that: micro process
Device uses single-chip microcontroller, FPGA or CPLD.
5. electrical-optical conversion module bias point as claimed in claim 3 without spuious locking system, it is characterised in that: it is therein
Laser driving uses DA circuit or associated analog；Jitter generator is for generating faint low frequency dither.
6. a kind of electrical-optical conversion module bias point without spuious locking means, including it is of any of claims 1-5
Electrical-optical conversion module bias point without spuious locking system, further include following steps: initialization self-test, to electrical-optical conversion module
Each section carries out state-detection；Intrinsic data table is established, in the case where dither signal starts and loads, scanning and acquisition modulation
Device output power Po, laser output power PLD, fundamental signal Pmod, 2 rank signal PNL2 and bias voltage VB, and establish each
Parameter intrinsic data table corresponding with bias voltage VB；Operating point is without spuious control, under dither signal closed state, utilizes
The intrinsic data table of Po/PLD and VB forms feedback control to electrical-optical conversion module；State of a control detection and reconstruction, to electrical-optical
Whether the state of a control of conversion module is accurately monitored, if exceed given threshold, carry out intrinsic data table rescan and
It establishes.
7. electrical-optical conversion module bias point as claimed in claim 6 without spuious locking means, it is characterised in that: initialization
Self-test comprises the steps of: that laser diode current loads, and loads scheduled driving current to laser using laser driving, generates
The intrinsic optical signal of electrical-optical conversion module；The photoelectric current of back light detector detects, judge laser and back light detector whether work
Make normal；Modularot voltage scanning carries out bias voltage scanning to modulator using modulator driving；To the light of detection detector
Electric current is detected, and is judged modulator and is detected the working condition of detector.
8. electrical-optical conversion module bias point as claimed in claim 6 without spuious locking means, it is characterised in that: Domination number
Establish according to table, steps are as follows: starting jitter generator generates the dither signal of 1 kHz, and together with modulator bias voltage VB
It is loaded into modulator input terminal；The scanning of modulator bias voltage, scanning reticle bias voltage VB is from minimum value to maximum value；It adopts
Collect back light detector and detects the current value of detector；Extract laser output power PLD, modulator output power Po, basic mode
Signal Pmod(1 kHz), 2 rank signal PNL2(2 kHz) numerical value；Establish PLD, Po, Pmod, PNL2, Po/PLD, Pmod/
PNL2 intrinsic data table corresponding with VB, stores into data storage.
9. electrical-optical conversion module bias point as claimed in claim 6 without spuious locking means, it is characterised in that: realize work
It is as follows to make the step of point is without spuious control: closing dither signal, avoids introducing signal spuious；Just according to the setting of intrinsic data table
It hands over bias point to correspond to bias voltage value, passes through modulator drive load to modulator；Detect back light detector and detection detector
Current value, acquire laser output power PLD and modulator output power Po, and then acquire current state ratio Po/PLD；
Offset voltage Vb is acquired according to intrinsic data table；Offset voltage Vb is added to bias voltage VB, makes modulator working condition extremely
Quadrature bias point.
10. electrical-optical conversion module bias point as claimed in claim 6 without spuious locking means, it is characterised in that: control shape
The step of state detection is with reconstruction is as follows: receiving intrinsic data table trigger signal；Start jitter generator, generates dither signal, and
Dither signal is loaded into modulator；Extract laser output power PLD, modulator output power Po, fundamental signal Pmod,
The numerical value of 2 rank signal PNL2, and calculate the numerical value of Po/PLD and Pmod/PNL2；By obtained Po/PLD and Pmod/PNL2
The numerical value of numerical value and intrinsic data table compare, and given threshold is seen if fall out, if being not required to weight without departing from threshold value
Intrinsic data table newly is established, and carries out operating point and needs to re-establish intrinsic data if judgement exceeds threshold value without spuious control
Table.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910592297.8A CN110417475B (en) | 2019-07-03 | 2019-07-03 | System and method for non-stray locking of bias point of electro-optic conversion module |
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| CN201910592297.8A CN110417475B (en) | 2019-07-03 | 2019-07-03 | System and method for non-stray locking of bias point of electro-optic conversion module |
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