CN206741132U - A kind of bias controller based on chaotic signal - Google Patents
A kind of bias controller based on chaotic signal Download PDFInfo
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- CN206741132U CN206741132U CN201720479129.4U CN201720479129U CN206741132U CN 206741132 U CN206741132 U CN 206741132U CN 201720479129 U CN201720479129 U CN 201720479129U CN 206741132 U CN206741132 U CN 206741132U
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- electrooptic modulator
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Abstract
The utility model discloses a kind of bias controller based on chaotic signal, is mainly used in the optics shift frequency based on electrooptic modulator, and the utility model includes laser, electrooptic modulator, photo-coupler, biasing control module.Wherein described biasing control module includes opto-electronic transforming signal amplification block, analog-to-digital conversion module, controller, direct current biasing output circuit, chaos signal generator, sinusoidal signal generator, signal mixed circuit；The utility model is on the basis of existing electrooptic modulator bias controller, by introducing new biasing control module, realizes to detecting the frequency displacement of light and the application of chaotic signal.Replace low-frequency excitation signal to carry out feedback modulation by wideband chaotic signal, reduce spurious signal.
Description
Technical field
It the utility model is related to technical field of photo communication, particularly a kind of bias controller based on chaotic signal.
Background technology
Electrooptic modulator is the device being modulated using the electrooptic effect of some crystal to optical signal, is led in high-speed light
The application of the fields such as letter, Fibre Optical Sensor is very extensive.Electro-optical Modulation can be divided into longitudinal direction according to the difference of the direction of an electric field applied
Electro-optical Modulation and horizontal Electro-optical Modulation；According to the difference of modulation type, electric light phase-modulation and electro-optic intensity modulation can be divided into.Allusion quotation
The electrooptic modulator output characteristic curve of type is shown in schematic diagram 2, and electrooptic modulator output characteristic curve is a cosine function shape
Curve.For electrooptic modulator, environment temperature, mechanical distortion, mechanical oscillation and the polarization state change of input light can all draw
Play the slow drift of electrooptic modulator operating point（Fig. 2 is shown in signal）, so as to cause the performance depreciation of electrooptic modulator, adjusted to electric light
The application of device processed brings trouble.Therefore, it is very necessary electrooptic modulator operating point to be carried out from motion tracking and control.
In addition, when carrying out electrooptic modulator operating point from motion tracking and control, traditional electrooptic modulator operating point
Control program can often be adjusted using the low-frequency excitation signal in the input of direct current biasing end as feedback signal, this method in electric light
Single-tone noise signal is brought on the output energy spectrum of device processed, and the single-tone noise signal is easily brought in modulation due to non-linear
It is spuious, and then influence follow-up processing and application.
But existing electrooptic modulator adjusts control device as shown in figure 5, often only passing through simple shift frequency sinusoidal signal
And direct current biasing low-frequency excitation signal is controlled, so being difficult to avoid that influence of the disturbing signal to output spectra, have certain
Limitation, although the stable work of electrooptic modulator can be realized, often introduce excessive spuious.
The content of the invention
Technical problem to be solved in the utility model is overcome the deficiencies in the prior art and provides and a kind of believed based on chaos
Number bias controller, carry out feedback modulation using chaotic signal, eliminate the limitation of traditional structure well so that electricity
Continuous light is more conducive to subsequent treatment caused by light modulation, and has wider array of application.
The utility model uses following technical scheme to solve above-mentioned technical problem：
According to the utility model proposes a kind of bias controller based on chaotic signal, including laser, electric light adjust
Device, photo-coupler and biasing control module processed, the biasing control module include opto-electronic transforming signal amplification block, analog-to-digital conversion
Module, controller, direct current biasing output circuit, chaos signal generator, sinusoidal signal generator and signal mixed circuit；Its
In,
Laser, for exporting continuous laser to electrooptic modulator；
Electrooptic modulator, for by continuous laser shift frequency, output signal light to photo-coupler；
Photo-coupler, for flashlight to be divided into two-way：First via light exports as optics local oscillation signal, and the second road light is made
For feedback light output to opto-electronic transforming signal amplification block；
Opto-electronic transforming signal amplification block, for the second road light to be converted into after voltage signal and amplify, after output amplification
Voltage signal to analog-to-digital conversion module；
Analog-to-digital conversion module, exported for the voltage signal after amplification to be converted into data signal as feedback signal to control
Device processed；
Chaos signal generator, for exporting two-way broadband noise signal, export all the way to signal mixed circuit, another way
Exported as reference signal to controller；
Controller, for the work of control chaotic signal generator and sinusoidal signal generator, and to the feedback of input
Signal and reference signal are handled, and draw electrooptic modulator operating point drift situation, control direct current inclined according to the drift situation
Put output circuit；
Direct current biasing output circuit, for exporting DC offset voltage signal to the direct current biasing input of electrooptic modulator
Mouthful so that the operating point of electrooptic modulator is close to best operating point；
Sinusoidal signal generator, for producing pure sinusoidal signal and outputting this to signal mixed circuit；
Signal mixed circuit, for broadband noise signal and pure sinusoidal signal to be superimposed, produce RF control signal
And the radio frequency control terminal of electrooptic modulator is output this to, RF control signal controls the work of electrooptic modulator.
As a kind of further prioritization scheme of bias controller based on chaotic signal described in the utility model, most preferably
Operating point is that the electrooptic modulator DC offset voltage required in Output optical power minimum under conditions of the work of continuous light is big
It is small.
As a kind of further prioritization scheme of bias controller based on chaotic signal described in the utility model, modulus
The MCP3428 of the model Microchip companies of modular converter.
It is sinusoidal as a kind of further prioritization scheme of bias controller based on chaotic signal described in the utility model
The AD9915 of the model AD companies of signal generator.
As a kind of further prioritization scheme of bias controller based on chaotic signal described in the utility model, control
The model LCMXO1200 of device.
The utility model compared with prior art, has following technique effect using above technical scheme：
（1）The utility model realizes the shift frequency effect of electrooptic modulator using sinusoidal modulation wave so that exports continuous light
Positioned at non-fundamental frequency position, it is easy to follow-up processing；
（2）The utility model replaces low-frequency excitation signal to carry out best operating point control with broadband noise signal, it is therefore prevented that
Direct current biasing end introduces the single-tone noise that low-frequency excitation signal is brought so that and the output noise spectrum of electrooptic modulator is more flat,
Effectively reduce influence of the spurious signal to optics shift frequency quality.
Brief description of the drawings
Fig. 1 is system construction drawing of the present utility model.
Fig. 2 is the electrooptic modulator bias voltage control schematic diagram based on photo-coupler in the prior art.
Fig. 3 is broadband noise signal waveform schematic diagram.
Fig. 4 is best operating point control principle schematic diagram of the broadband noise signal as feedback signal；Wherein,（a）For work
Make situation when point voltage drift is extremely less than best operating point voltage,（b）When being located at best operating point voltage for quiescent potential
Situation,（c）Situation during higher than best operating point voltage is drifted to for quiescent potential.
Fig. 5 is that existing electrooptic modulator adjusts controling device structure diagram.
Embodiment
The technical solution of the utility model is described in further detail below in conjunction with the accompanying drawings：
The utility model is that an electrooptic modulator for continuous light modulation is biased voltage-controlled closed-loop control
Device.As shown in figure 1, mainly include two big modules：Spectral module, electrooptic modulator biasing control module.
Spectral module is exactly mainly photo-coupler.
System construction drawing of the present utility model is as shown in figure 1, a kind of bias controller based on chaotic signal, including swashs
Light device, electrooptic modulator, photo-coupler and biasing control module, the biasing control module include photoelectric conversion signal amplification mould
Block, analog-to-digital conversion module, controller, direct current biasing output circuit, chaos signal generator, sinusoidal signal generator and signal mix
Close circuit；Wherein,
Laser, for exporting continuous laser to electrooptic modulator；
Electrooptic modulator, for by continuous laser shift frequency, output signal light to photo-coupler；
Photo-coupler, for flashlight to be divided into two-way：First via light exports as optics local oscillation signal, and the second road light is made
For feedback light output to opto-electronic transforming signal amplification block；
Opto-electronic transforming signal amplification block, for the second road light to be converted into after voltage signal and amplify, after output amplification
Voltage signal to analog-to-digital conversion module；
Analog-to-digital conversion module, exported for the voltage signal after amplification to be converted into data signal as feedback signal to control
Device processed；
Chaos signal generator, for exporting two-way broadband noise signal, export all the way to signal mixed circuit, another way
Exported as reference signal to controller；
Controller, for the work of control chaotic signal generator and sinusoidal signal generator, and to the feedback of input
Signal and reference signal carry out calculation process, draw electrooptic modulator operating point drift situation, are controlled according to the drift situation straight
Stream biasing output circuit；
Direct current biasing output circuit, for exporting DC offset voltage signal to the direct current biasing input of electrooptic modulator
Mouthful so that the operating point of electrooptic modulator is close to best operating point；
Sinusoidal signal generator, for producing pure sinusoidal signal and outputting this to signal mixed circuit；
Signal mixed circuit, for broadband noise signal and pure sinusoidal signal to be superimposed, produce RF control signal
And the radio frequency control terminal of electrooptic modulator is output this to, RF control signal controls the work of electrooptic modulator.
Opto-electronic transforming signal amplification block contains photodetector and across resistance amplifying circuit two parts.Light used herein
The model GD3560J of electric explorer, it is a kind of near infrared photodetector, and spectrum sensitive band is at 1550nm；Driving electricity
When pressing 5V, the dark current of the photodetector is up to 1nA；Responsiveness 0.85A/W, meet device requirement.Photodetector
Convert optical signals into current signal.Mainly it is made up of across resistance amplifying circuit amplifier AD8000.The amplifier is low energy, low noise, with
And 1.58GHz bandwidth, device requirement can be met.
Analog-to-digital conversion module is exactly mainly that analog voltage signal caused by opto-electronic transforming signal amplification block is converted into number
Word signal.The MCP3428 of A/D converter model Microchip companies used herein, it is that a have 16 precision
Analog-digital converter, it can meet that the utility model extinction ratio there are about 30dB requirement completely.
Controller herein is the non-volatile unlimited configuration programmable logical device of Lattice companies
The LCMXO1200 of MachXOPLD series.The PLD provides in-line memory, facilitates the buffering of data；Together
When it also has built-in PLL and oscillator, the Clock management that can be integrated.The controller receives the number of A/D generations
Word signal, calculation process is carried out to this digital quantity, the current working condition of electrooptic modulator is obtained, according to this of electrooptic modulator
Individual working condition, adjust the output of output driving circuit.
Direct current biasing output circuit includes D/A converters and amplifier.The precision of digital-to-analogue conversion determines last electric light
The operating point of modulator bias voltage control system locking and the degree of closeness of electrooptic modulator best operating point, so D/A turns
The precision of parallel operation can obtain greatly a bit, and digital analog converter used herein is the DAC8552 of TI companies, and it is 16 precision
The D/A converters of voltage output type.Amplifier is mainly the load driving force and Electro-optical Modulation for increasing output driving circuit
The scope of device direct current biasing end input voltage, is larger than a half-wave voltage.Due to D/A output voltages to be matched, here
Amplifier position AD8000 has the characteristics of track to track exports high supply voltage, and bandwidth reaches 1.58GHz.
Chaos signal generator is used to produce broadband noise signal, so using saturated diode formula noise generator.
Sinusoidal signal generator includes Direct Digital Synthesizer, available for the sinusoidal voltage of synthesis shift frequency, institute
With the AD9915 used here as AD companies, up to 1GHz sine wave, and carry D/A converter can be produced.
Signal mixed circuit includes combiner, for by signal caused by chaos signal generator and sinusoidal signal generator
It is generated as radio-frequency modulations ripple.
In order to reduce the low-frequency excitation signal, one broadband noise signal of offer replaces low-frequency excitation signal in the present apparatus
As feedback signal.The energy of broadband noise signal can be regarded as carries out full-wave rectification to broadband noise signal.Broadband noise is believed
Number random signal is similar to, its waveform is as shown in Figure 3.By a broadband noise signal loading in radio frequency control port, with this
Feedback signal as best operating point control.So EOM is modulated will modulate a broadband noise on the continuous light come
Signal, it is changed into voltage signal by detector.It is broadband noise signal multiplication by the feedback signal of acquisition and reference signal, and leads to
The drift situation of electrooptic modulator output characteristic curve can must be obtained after crossing low pass filter filtering, and then determines operating point
Drift conditions.EOM is operated at characteristic minimum value i.e. best operating point, in Fig. 4（b）It is shown, modulated signal frequency
Rate is twice of generation broadband noise signal, and now feedback signal and reference signal multiplied result are 0；If EOM operating points are to low
Bias voltage direction is moved, then feedback signal and reference signal phase are in the same direction, in Fig. 4（a）It is shown, now feedback signal with
Reference signal product is approximately positive DC quantity；EOM operating points are moved toward high bias voltage direction, in Fig. 4（c）It is shown,
Then feedback signal and reference signal opposite in phase, now feedback signal and reference signal product are approximately negative DC quantity.Pass through
Differentiate the result of product of feedback signal and reference signal, you can the offset direction of operating point is directly differentiated, and it is real by controller
Now to the control of operating point.
Using broadband noise signal as feedback signal the noise of introducing can be made to be distributed on frequency spectrum in broad spectral range, gone
Except concentration of the low-frequency excitation signal in some frequencies influences so that the output energy spectrum of electrooptic modulator is more stable, favorably
In follow-up frequency spectrum processing.
Above content is to combine specific preferred embodiment further detailed description of the utility model, it is impossible to
Assert that specific implementation of the present utility model is confined to these explanations.For the ordinary skill of the utility model art
For personnel, without departing from the concept of the premise utility, some simple deductions can also be made or substituted, should all be regarded
To belong to the scope of protection of the utility model.
Claims (5)
1. a kind of bias controller based on chaotic signal, including laser, electrooptic modulator, photo-coupler and biasing control
Module, it is characterised in that it is described biasing control module include opto-electronic transforming signal amplification block, analog-to-digital conversion module, controller,
Direct current biasing output circuit, chaos signal generator, sinusoidal signal generator and signal mixed circuit；Wherein,
Laser, for exporting continuous laser to electrooptic modulator；
Electrooptic modulator, for by continuous laser shift frequency, output signal light to photo-coupler；
Photo-coupler, for flashlight to be divided into two-way：First via light exports as optics local oscillation signal, and the second road light is as anti-
Light output is presented to opto-electronic transforming signal amplification block；
Opto-electronic transforming signal amplification block, for the second road light to be converted into after voltage signal and amplify, the electricity after output amplification
Signal is pressed to analog-to-digital conversion module；
Analog-to-digital conversion module, exported for the voltage signal after amplification to be converted into data signal as feedback signal to control
Device；
Chaos signal generator, for exporting two-way broadband noise signal, export all the way to signal mixed circuit, another way conduct
Reference signal is exported to controller；
Controller, for the work of control chaotic signal generator and sinusoidal signal generator, and to the feedback signal of input
Handled with reference signal, draw electrooptic modulator operating point drift situation, control direct current biasing defeated according to the drift situation
Go out circuit；
Direct current biasing output circuit, for exporting DC offset voltage signal to the direct current biasing input port of electrooptic modulator,
So that the operating point of electrooptic modulator is close to best operating point；
Sinusoidal signal generator, for producing pure sinusoidal signal and outputting this to signal mixed circuit；
Signal mixed circuit, for broadband noise signal and pure sinusoidal signal to be superimposed, produce RF control signal and simultaneously will
It exports to the radio frequency control terminal of electrooptic modulator, RF control signal and controls the work of electrooptic modulator.
A kind of 2. bias controller based on chaotic signal according to claim 1, it is characterised in that best operating point
For the DC offset voltage size that electrooptic modulator is required in Output optical power minimum under conditions of the work of continuous light.
A kind of 3. bias controller based on chaotic signal according to claim 1, it is characterised in that analog-to-digital conversion mould
The MCP3428 of the model Microchip companies of block.
4. a kind of bias controller based on chaotic signal according to claim 1, it is characterised in that sinusoidal signal is sent out
The AD9915 of the model AD companies of raw device.
A kind of 5. bias controller based on chaotic signal according to claim 1, it is characterised in that the type of controller
Number it is LCMXO1200.
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| CN201720479129.4U CN206741132U (en) | 2017-05-03 | 2017-05-03 | A kind of bias controller based on chaotic signal |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106932925A (en) * | 2017-05-03 | 2017-07-07 | 南京大学 | A kind of bias controller and method based on chaotic signal |
| CN108491016A (en) * | 2018-03-19 | 2018-09-04 | 南京大学 | A kind of best operating point control device and method of undisturbed electrooptic modulator |
| CN108809439A (en) * | 2018-05-07 | 2018-11-13 | 南京大学（苏州）高新技术研究院 | A kind of binary space chaotic laser light communication system based on single order transverse mode |
| CN108833019A (en) * | 2018-06-25 | 2018-11-16 | 华中科技大学 | A kind of any Bias point control method of smooth I/Q modulator and control system |
| CN109782517B (en) * | 2019-01-25 | 2021-01-01 | 太原理工大学 | Method and device for generating low coherent light by broadband chaotic modulation in laser display |
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2017
- 2017-05-03 CN CN201720479129.4U patent/CN206741132U/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106932925A (en) * | 2017-05-03 | 2017-07-07 | 南京大学 | A kind of bias controller and method based on chaotic signal |
| CN106932925B (en) * | 2017-05-03 | 2023-03-14 | 南京大学 | Bias control device and method based on chaotic signal |
| CN108491016A (en) * | 2018-03-19 | 2018-09-04 | 南京大学 | A kind of best operating point control device and method of undisturbed electrooptic modulator |
| CN108491016B (en) * | 2018-03-19 | 2019-10-22 | 南京大学 | A kind of best operating point control device and method of undisturbed electrooptic modulator |
| CN108809439A (en) * | 2018-05-07 | 2018-11-13 | 南京大学（苏州）高新技术研究院 | A kind of binary space chaotic laser light communication system based on single order transverse mode |
| CN108809439B (en) * | 2018-05-07 | 2021-09-17 | 南京大学（苏州）高新技术研究院 | Binary system space chaotic laser communication system based on first-order transverse mode |
| CN108833019A (en) * | 2018-06-25 | 2018-11-16 | 华中科技大学 | A kind of any Bias point control method of smooth I/Q modulator and control system |
| CN108833019B (en) * | 2018-06-25 | 2020-01-03 | 华中科技大学 | Method and system for controlling arbitrary bias point of optical IQ modulator |
| CN109782517B (en) * | 2019-01-25 | 2021-01-01 | 太原理工大学 | Method and device for generating low coherent light by broadband chaotic modulation in laser display |
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