CN106549714A - A kind of control method and control device based on IQ electrooptic modulator quadrature voltages - Google Patents
A kind of control method and control device based on IQ electrooptic modulator quadrature voltages Download PDFInfo
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- CN106549714A CN106549714A CN201610929281.8A CN201610929281A CN106549714A CN 106549714 A CN106549714 A CN 106549714A CN 201610929281 A CN201610929281 A CN 201610929281A CN 106549714 A CN106549714 A CN 106549714A
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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
- H04B10/516—Details of coding or modulation
- H04B10/548—Phase or frequency modulation
Abstract
The present invention discloses a kind of control method based on IQ electrooptic modulator quadrature voltages and control device, and IQ electrooptic modulators increase Dare interferometer, including step using two-in-parallel Mach：The ripple so that the sub- manipulators of I and the sub- manipulator output two-way BPSK optical signals of Q are just being joined, is modulated to QPSK optical signals；It is f to frequency is superimposed on the sub- manipulators of I, the just bias voltage of the sub- manipulators of Q respectively1、f2Small size periodic disturbance, f1≠f2；The low speed AC small-signal that IQ electrooptic modulators are produced under above-mentioned small size periodic disturbance is obtained by back light detector MPD, and extracts f therein1+f2And frequency component；Slightly disturb to being superimposed on the bias voltage of pi/2 phase modulation electrode, extract f1+f2With the feedback waveform of frequency component；To f1+f2Judged with the amplitude and phase place of the feedback waveform of frequency component, and adjusted the bias voltage applied on pi/2 phase modulation electrode accordingly.The inventive method and device are encapsulated using low frequency, so as to improve the reliability of IQ electrooptic modulators, reducing packaging cost.
Description
Technical field
The present invention relates to the autocontrol method and its control device of a kind of manipulator bias voltage, more particularly to a kind of base
In the autocontrol method and its control device of the IQ electrooptic modulator quadrature voltages of low speed MPD, the invention belongs to the communications field.
Background technology
Three big core opto-electronic devices of coherent light communication are tunable laser, manipulator and coherent receiver, adjustable
The light that humorous laser instrument (ITLA) sends enters manipulator, and the optical signal of modulators modulate is after long range propagation by coherent reception
Machine (ICR) is received.At present, the modulation format that 100G coherent modulators are generally adopted is the dual-polarization QPSK of single carrier
(DP-QPSK), each polarization I/Q modulator optical texture adopts two-in-parallel Mach-increasing Dare interferometer (MZI) structure, should
Two list MZI of structure are formed in parallel, and two list MZ manipulators recommend generation bpsk signal by radio-frequency driven, then carry out 90 °
After phase shift and combine ripple, form QPSK optical signals.
For the MZI types IQ electrooptic modulator in parallel of single polarization, quiescent potential can be during use because various
Factor (environmental change, device self performance change etc. factor) and occur drift, quiescent potential drift after manipulator can not be defeated
Go out high-quality signal, after receiving terminal demodulation, error code will be produced.In order that manipulator works long hours in the operating conditions of QPSK,
Need to make manipulator autobias control.In industry, each manipulator supplier and user have the autobias of oneself at present
Control program, mainly by monitoring the change of certain physical quantity (luminous power, signal envelope, shake etc.) judging manipulator be
It is no to be in just bias, then by feedback circuit come dynamic regulation.
The MZI types IQ electrooptic modulator in parallel of single polarization, needs to adjust the sub- manipulator bias biass of I, the sub- manipulator bias of Q
Bias and pi/2 quadrature voltage.Due to the symmetry in I/Q modulator structure function, the sub- manipulator bias of I are biased and the sub- manipulators of Q
The autobias control algolithm of bias biass is similar to；And the automatic control algorithm of pi/2 quadrature voltage is then relative complex.Industry is commonly used
Pi/2 quadrature voltage automatic control algorithm, be allow QPSK optical signals enter a high speed MPD (monitoring
Photodiode, back light detector), with the process of MPD back-end circuits, the amplitude of QPSK optical signals is obtained, adjust the positive alternating current of pi/2
Pressure, makes the amplitude minimum, and now corresponding pi/2 quadrature voltage is its just bias voltage.Although the algorithm MPD bandwidth is had compared with
High request, but control gets up fairly simple, and algorithm is clear and easy to understand, in the industry cycle uses than wide.OIF 100G Lithium metaniobates and
In InP coherent modulator standards, the equal clear stipulaties MPD bandwidth of manipulator, it is desirable to be not less than 1GHz, this is mainly due to existing
In having I/Q modulator autobias control program, control of the segmentation scheme to pi/2 quadrature voltage is to monitor 32G bauds by MPD
, come what is realized, needing guarantee high-speed optical signal to enter the decay of MPD amplitude can not be too big for the amplitude of rate QPSK optical signal, thus this
Plant control program higher to mpd bandwidth requirements..However, high-frequency package is carried out to manipulator MPD, can greatly increase manipulator
Packaging cost, and corresponding shell, high-frequency ceramic plate are required for well-designed, and package dimension is big.
The content of the invention
The invention provides a kind of autocontrol method of the IQ electrooptic modulator quadrature voltages based on low speed MPD, the control
Method processed only needs low speed MPD (bandwidth～1MHz magnitudes), just IQ electrooptic modulators quadrature voltage can be carried out accurate automatic
Control, so as to substantially reduce the packaging cost of IQ electrooptic modulators.
The technical scheme is that：
A kind of control method based on IQ electrooptic modulator quadrature voltages, the IQ electrooptic modulators adopt two-in-parallel horse
It is conspicuous-to increase Dare interferometer structure, comprise the steps：Step 1：The bias voltage of the sub- manipulators of I and the sub- manipulators of Q is adjusted, will
Both are adjusted to BPSK operating conditions, make both export the optimal of BPSK optical signals, the sub- manipulators of acquisition I and the sub- manipulators of Q respectively
Bias voltage；Suitable bias voltage is applied by the pi/2 phase modulation electrode to IQ electrooptic modulators so that the sub- manipulators of I and Q are sub
Manipulator output two-way BPSK optical signals are just being joined ripple, are modulated to QPSK optical signals；Step 2：To the sub- manipulators of I, the sub- manipulators of Q
Just bias voltage on be superimposed frequency respectively for f1、f2Small size periodic disturbance, wherein f1≠f2；Step 3：By backlight
Detector MPD obtains the low speed AC small-signal that IQ electrooptic modulators are produced under above-mentioned small size periodic disturbance, and extracts which
In f1+f2And frequency component；Step 4：Slightly disturb to being superimposed on the bias voltage of pi/2 phase modulation electrode, extract f1+f2And frequency division
The feedback waveform of amount；Step 5：To f1+f2Judged with the amplitude and phase place of the feedback waveform of frequency component, and adjusted pi/2 accordingly
The bias voltage applied on phase modulation electrode.
The step 1 is adopted with the following method：Signal is loaded to IQ electrooptic modulators, by the output light of IQ electrooptic modulators,
It is input to spectrogrph；The sub- manipulators of I, the bias voltage of the sub- manipulators of Q are adjusted repeatedly successively, will be in IQ electrooptic modulator output lights
The spike leveling of spectrum central wavelength, now the sub- manipulators of I and the sub- manipulators of Q are both adjusted to BPSK states.
The small size periodic disturbance applied to the sub- manipulators of I, the sub- manipulators of Q in the step 2 is sine wave disturbance, and this is just
The frequency of string wave disturbance is hundred Hz magnitudes, perturbation amplitude less than IQ electrooptic modulators biasing half-wave voltage 10%.
The sine wave disturbance that frequency is 220Hz, amplitude 10mV is superimposed to the bias voltage of the sub- manipulators of I；To the sub- manipulators of Q
Bias voltage superposition frequency be 440Hz, the sine wave disturbance of amplitude 10mV.
It is small size square wave to the small size disturbance of pi/2 phase modulation electrode superposition in the step 4, the amplitude of the small size square wave is less than
The 10% of the biasing half-wave voltage.
The detailed process of the step 5 is as follows：When the amplitude of the feedback square waveform with frequency component is less than or equal to setting threshold
During value amplitude, keep the bias voltage on pi/2 phase modulation electrode constant；When the amplitude of the feedback waveform with frequency component is more than setting threshold
During value amplitude：When the perturbation direction that is superimposed on the bias voltage in pi/2 phase modulation electrode with and frequency component feedback wave just as to when,
Reduce the bias voltage on pi/2 phase modulation electrode；When the perturbation direction being superimposed on the bias voltage in pi/2 phase modulation electrode and and frequency division
When the feedback waveform of amount is reverse, increase the bias voltage on pi/2 phase modulation electrode, until little with the amplitude of the feedback waveform of frequency component
In or be equal to given threshold amplitude.
Further include step 6：The amplitude of the feedback waveform of monitor in real time and frequency component, if monitoring and frequency component amplitude
Feedback waveform amplitude exceed setting threshold amplitude, the bias voltage applied on pi/2 phase modulation electrode is repaiied by step 5
Just.
A kind of control device of the control method based on IQ electrooptic modulator quadrature voltages, including IQ electrooptic modulators and anti-
Feedback control circuit, the IQ electrooptic modulators include the female MZI being formed in parallel by I ways MZI and Q ways MZI, the I ways
MZI, Q way MZI, mother MZI have Q roads phase modulation electrode, I roads phase modulation electrode, pi/2 phase modulation electrode, the feedback control electricity respectively
Road includes photo-detector, block isolating circuit, band filter, high-speed ADC, central controller；Wherein, the photo-detector monitors institute
The optical signal of IQ electrooptic modulators output is stated, the photo-signal for obtaining is converted into into output after photovoltage and is arrived described every straight electricity
Road；The block isolating circuit extracts the output of low speed AC small-signal to the band filter；The band filter extracts exchange
Waveform in small-signal and frequency component simultaneously exports the high-speed ADC；The high-speed ADC is sampled to the waveform being input into,
By the output of obtain and frequency component amplitude to the central controller；The central controller gives I roads phase modulation electrode, Q roads
Phase modulation electrode, pi/2 phase modulation electrode add DC offset voltage, and apply to I roads phase modulation electrode, Q roads phase modulation electrode respectively
Frequency is f1、f2Sine wave disturbance, wherein f1≠f2, apply square wave disturbance to pi/2 phase modulation electrode；The central controller is carried
Take after applying disturbance and frequency component feedback square wave, to and the feedback square wave amplitude and phase place of frequency component judge：Work as feedback
When square wave amplitude is more than given threshold amplitude, adjustment pi/2 phase modulation electrode voltage is until feedback square wave amplitude is less than or equal to setting
Threshold amplitude.
Further include adder, the direct current biasing on I roads phase modulation electrode, Q roads phase modulation electrode, pi/2 phase modulation electrode
Voltage and disturbance are coupled by corresponding adder respectively.
The band filter is the super narrow band filter of high Q factor.
The invention has the advantages that：
Traditional IQ electrooptic modulator quadrature voltages are automatically controlled, it is desirable to which, in more than 1GHz, the present invention is to MPD for MPD bandwidth
Bandwidth requirement is low, and 1Mhz can meet requirement；Using the control algolithm in the present invention, IQ electrooptic modulators MPD is sealed using low frequency
Dress, so as to improve the reliability of IQ electrooptic modulators, greatly reducing packaging cost.
Description of the drawings
Fig. 1 is the structural representation of parallel connection MZI type IQ electrooptic modulators of the invention；
Fig. 2 is that the present invention is added after disturbance to IQ bias, the spectrogram of MPD output AC small-signals；
Fig. 3 is the variation relation of the present invention and frequency intensity with phase place between IQ, and when IQ is orthogonal, and frequency intensity is minimum；
Fig. 4 is the schematic block circuit diagram that manipulator quadrature voltage of the present invention automatically controls realization；
Fig. 5 is manipulator quadrature voltage automatic control algorithm flow process of the present invention；
Wherein：
1:Light input end； 2:Q ways MZI；
3:I ways MZI； 4:Female MZI；
5:Q roads phase modulation electrode； 6:I roads phase modulation electrode；
7:Pi/2 phase modulation electrode； 8:Light output end；
9:Photo-detector； 10:Block isolating circuit；
11:Band filter； 12:High-speed ADC；
13:Central controller； 14:Adder；
Specific embodiment
With reference to embodiment and accompanying drawing to invention in the IQ electrooptic modulator quadrature voltages based on low speed MPD it is automatic
Control method is described in detail, and in embodiment, employs MZI types silicon light I/Q modulator in parallel, wherein the MPD bandwidth of manipulator
For 300MHz, belong to low speed MPD, be unsatisfactory for the requirement that MPD bandwidth in OIF standards should be greater than 1GHz, but pass through institute of the present invention
The autocontrol method of offer enables to the performance indications of the manipulator and can reach the requirement of OIF standards.
The invention provides a kind of autobias control device of MZI types IQ electrooptic modulator in parallel, as shown in figure 4, bag
Include IQ electrooptic modulators and feedback control circuit.Wherein, IQ electrooptic modulators adopt two-in-parallel Mach-increasing Dare interferometer
(Mach-Zehnder interferometer) structure (hereinafter referred to as parallel connection MZI), as shown in figure 1, parallel connection MZI is by two
Sub- MZI (Q ways MZI 2, I ways MZI 3) is formed in parallel a mother MZI 4, Q ways MZI 2, I ways MZI 3 and mother MZI
Being made in 4 light path respectively has Q roads phase modulation electrode 5, I roads phase modulation electrode 6, pi/2 phase modulation electrode 7, and RF driving signal passes through two
Traveling wave electrode above individual sub- MZI is carried in Q ways MZI 2 and I ways MZI 3, and the light source that laser instrument sends is input into from light
End 1 enters IQ electrooptic modulators, and MZI structures one-to-two is evenly distributed to Q ways MZI 2 and I ways MZI 3 in parallel, high
Traveling wave electrode above two sub- MZI of fast rf signal be carried in two ways MZI after to be input into optical signal adjust
System, by suitable bias voltage is added on Q roads phase modulation electrode 5, I roads phase modulation electrode 6 and pi/2 phase modulation electrode 7 respectively, adjusting
Q roads phase modulation electrode 5 and I roads phase modulation electrode 6 control the bias voltage of two ways MZI, two ways MZI of IQ when just bias respectively
The BPSK optical signals of output close ripple at female MZI 4, and the bias voltage adjusted on pi/2 phase modulation electrode 7 causes IQ orthogonal, defeated in light
Go out and at end 8, export the QPSK optical signals for modulating.
From the optical signal of the optical signal point certain proportion energy of the output of outfan 8 to photo-detector 9, photo-detector 9 will
To photo-signal be converted into after photovoltage, extract low speed AC small-signal through block isolating circuit 10, the ac small signal enters
Enter band filter 11, extract the waveform of specific frequency component, 12 pairs of waveforms of high-speed ADC are sampled, by the width for obtaining
Value input central controller 13；Central controller 13 is by pin BI, BQ, BP to I roads phase modulation electrode 6,5 and of Q roads phase modulation electrode
Pi/2 phase modulation electrode 7 adds suitable DC offset voltage, by pin DI, DQ, DP to I roads phase modulation electrode 6, Q roads phase modulation electrode
5 and pi/2 phase modulation electrode 7 plus low speed disturbance (dither) square wave, per road DC offset voltage and disturbance square wave is by relative
The adder 14 answered is coupled, and is carried on I roads phase modulation electrode 6, Q roads phase modulation electrode 5 and pi/2 phase modulation electrode 7.
Above-mentioned photo-detector 9, block isolating circuit 10, band filter 11, high-speed ADC 12, central controller 13, adder
14 feedback control circuits for constituting autobias control device.
Fig. 2 is that the present invention is added after disturbance to I, Q bias electrodes, the spectrogram of MPD output AC small-signals；Give I roads
Bias electrodes add f1The small-signal disturbance of frequency, disturbs to small-signal of the Q roads bias electrodes plus f2 frequencies, wherein f1≠f2,
So that two frequencies produce beat frequency, in the frequency spectrum of the AC signal of MPD outputs, there is f1, f2Two natural frequencies and they
Interact the difference frequency component for producing | f2-f1| and with frequency component f2+f1, design suitable band filter 11 so that its transmission frequency
Spectrum center is in f2+f1, by the band filter, extract in MPD output signals and frequency component.
Fig. 3 be and frequency intensity with phase place between IQ variation relation, when IQ is orthogonal, and frequency intensity is minimum；Phase place is with pi/2
Change in voltage, disturbs to square wave of the pi/2 voltage plus the amplitude very little in a time domain, and central controller 13 can be monitored and frequency
Intensity is changed over, and obtains the feedback square wave with frequency intensity；When pi/2 voltage is in optimum voltage (IQ is orthogonal for correspondence), and
The feedback square wave of frequency intensity is minimum；Can be by monitoring minimum and frequency intensity feedback square wave, to carry out reality to pi/2 quadrature voltage
When control.
MZI types silicon light I/Q modulator power-up initializing in parallel in real-time example is (in embodiment, reverse-biased including adding to MPD
Voltage, adds underlayer voltage to manipulator) after, it is possible to carry out automatically controlling for quadrature voltage；It is a kind of to be based on low speed MPD
IQ electrooptic modulator quadrature voltages autocontrol method, as shown in figure 5, comprising the steps：
Step 1, the biasing bias voltages for adjusting IQ manipulators (i.e. I ways MZI and Q ways MZI), by IQ manipulators
It is adjusted to BPSK states；Concrete operation method is to load signal to IQ electrooptic modulators, and the output light of IQ electrooptic modulators is input into
To spectrogrph；The biasing bias voltages of I, Q are adjusted repeatedly successively, by the spike of IQ electrooptic modulator output spectrum central wavelengths
Leveling, now IQ manipulators be both adjusted to BPSK states；The spike of manipulator output spectrum central wavelength is integrated tunable
The not modulated DC component that laser module (ITLA) is exported, BPSK states correspondence DC component is 0, when IQ electrooptic modulators
When the spike of output spectrum central wavelength is submerged in the flat-top of BPSK spectrum, the BPSK states that IQ reaches standard are represented；It is logical
It is a kind of implementation to cross spectrogrph and IQ is transferred to just bias point, it is also possible to by light modulation analyser and sampling oscilloscope
Deng equipment, IQ is transferred to just bias point by auxiliary；
Step 2, to the sub- manipulator bias bias voltages of I, Q respectively plus frequency be f1、f2(f1≠f2) sine wave disturb
It is dynamic；f1、f2In hundred hz magnitudes, the amplitude of disturbance biases the 10% of half-wave voltage to value less than manipulator bias；Embodiment
In, we are 220Hz, the sine wave disturbance of amplitude 10mV to the sub- manipulator bias loading frequencies of I, are loaded to Q modulator bias
Frequency is 440Hz, the sine wave disturbance of amplitude 10mV；
Step 3, by back light detector MPD postpositive disposal circuit, block isolating circuit 10 extracts what bias biasing disturbances were produced
Low speed AC small-signal, the ac small signal enter band filter 11, extract and frequency (f1+f2) component waveform, high-speed ADC
12 pairs of waveforms are sampled, obtain and frequency component amplitude A, and input central controller 13 is processed；In embodiment, we
Employ the super narrow band filter of high Q factor i.e.：The Deliyannis band filters of amendment, by frequency for 660Hz's
With frequency signal detection out, for the signal processing in subsequent step；
Step 4, disturb plus square wave to pi/2 phase modulation electrode 7, the amplitude of disturbance is less than the biasing half-wave voltage
10%；And the feedback square-wave variations of monitoring and frequency component amplitude A；In embodiment, we give pi/2 phase modulation electrode 7bias loading frequencies
Rate is 250Hz, the square wave disturbance of amplitude 10mV；
The feedback square wave amplitude and phase place of step 5, central controller 13 pairs and frequency component amplitude A enters line algorithm judgement；When
When being less than or equal to given threshold amplitude with the feedback square wave amplitude of frequency component amplitude A, 7 voltage of pi/2 phase modulation electrode keeps constant；
When the feedback square wave amplitude with frequency component amplitude A is more than given threshold amplitude, judge the disturbance of 7 voltage of pi/2 phase modulation electrode with
With the phase relation of the feedback square wave of frequency component amplitude A：When the disturbance of 7 voltage of pi/2 phase modulation electrode and anti-with frequency component amplitude A
Feedback square wave reduces 7 voltage of pi/2 phase modulation electrode in the same direction, then；When the disturbance of 7 voltage of pi/2 phase modulation electrode and anti-with frequency component amplitude A
Present square wave reversely, then increase by 7 voltage of pi/2 phase modulation electrode, be less than or equal to up to the feedback square wave amplitude with frequency component amplitude A and set
After determining threshold amplitude, keep pi/2 7 voltages of phase modulation electrode constant；
The feedback square wave amplitude of step 6, monitor in real time and frequency component amplitude A, if monitoring the feedback with frequency component amplitude A
Square wave amplitude exceedes threshold value, then according to the scheme of step 5, corrected to increasing by 7 voltage of pi/2 phase modulation electrode in real time.
Although the present invention detailed example and describe correlation specific embodiment make reference, the technology to this area
It is for personnel, after the specification and drawings are read and understood, particularly above-mentioned in the thought and scope without departing substantially from the present invention
Device is implemented functionally, can be variously modified on device form and details.These changes fall within the present invention's
Protection domain required by claim.
Claims (10)
1. a kind of control method based on IQ electrooptic modulator quadrature voltages, the IQ electrooptic modulators using two-in-parallel Mach-
Increase Dare interferometer structure, it is characterised in that：Comprise the steps：
Step 1：The bias voltage of the sub- manipulators of I and the sub- manipulators of Q is adjusted, both is adjusted to BPSK operating conditions, is divided both
Not Shu Chu BPSK optical signals, obtain the just bias voltage of the sub- manipulators of I and the sub- manipulators of Q；By to IQ electrooptic modulators
Pi/2 phase modulation electrode applies suitable bias voltage so that the sub- manipulators of I and the sub- manipulator output two-way BPSK optical signals of Q are orthogonal
Ripple is closed, QPSK optical signals are modulated to；
Step 2：To be superimposed on the sub- manipulators of I, the just bias voltage of the sub- manipulators of Q respectively frequency be f1, f2 the small size cycle
Property disturbance, wherein f1≠f2；
Step 3：The low speed friendship that IQ electrooptic modulators are produced under above-mentioned small size periodic disturbance is obtained by back light detector MPD
Stream small-signal, and extract f therein1+f2And frequency component；
Step 4：Slightly disturb to being superimposed on the bias voltage of pi/2 phase modulation electrode, extract f1+f2With the feedback waveform of frequency component；
Step 5：To f1+f2Judged with the amplitude and phase place of the feedback waveform of frequency component, and adjusted pi/2 phase modulation electrode accordingly
The bias voltage of upper applying.
2. a kind of control method based on IQ electrooptic modulator quadrature voltages according to claim 1, it is characterised in that：Institute
State step 1 to adopt with the following method：Signal is loaded to IQ electrooptic modulators, by the output light of IQ electrooptic modulators, spectrum is input to
Instrument；The sub- manipulators of I, the bias voltage of the sub- manipulators of Q are adjusted repeatedly successively, will be in IQ electrooptic modulator output spectrum centre wavelengths
The spike leveling at place, now the sub- manipulators of I and the sub- manipulators of Q are both adjusted to BPSK states.
3. a kind of control method based on IQ electrooptic modulator quadrature voltages according to claim 1, it is characterised in that：Institute
The small size periodic disturbance applied to the sub- manipulators of I, the sub- manipulators of Q in stating step 2 is sine wave disturbance, the sine wave disturbance
Frequency is hundred Hz magnitudes, perturbation amplitude less than IQ electrooptic modulators biasing half-wave voltage 10%.
4. a kind of control method based on IQ electrooptic modulator quadrature voltages according to claim 3, it is characterised in that：It is right
The bias voltage superposition frequency of the sub- manipulators of I is 220Hz, the sine wave disturbance of amplitude 10mV；Bias voltage to the sub- manipulators of Q
Superposition frequency is 440Hz, the sine wave disturbance of amplitude 10mV.
5. a kind of control method based on IQ electrooptic modulator quadrature voltages according to claim 1, it is characterised in that：Institute
It is small size square wave to the small size disturbance of pi/2 phase modulation electrode superposition to state in step 4, and the amplitude of the small size square wave is less than the biasing half-wave
The 10% of voltage.
6. a kind of control method based on IQ electrooptic modulator quadrature voltages according to claim 1, it is characterised in that：Institute
The detailed process for stating step 5 is as follows：When the amplitude of the feedback square waveform with frequency component is less than or equal to given threshold amplitude, protect
The bias voltage held on pi/2 phase modulation electrode is constant；When the amplitude of the feedback waveform with frequency component is more than given threshold amplitude：When
The perturbation direction that is superimposed on the bias voltage of pi/2 phase modulation electrode with and frequency component feedback wave just as to when, reduction pi/2 phase modulation
Bias voltage on electrode；When the perturbation direction that is superimposed on the bias voltage in pi/2 phase modulation electrode with and frequency component feedback wave
When shape is reverse, increase the bias voltage on pi/2 phase modulation electrode, be less than or equal to up to the amplitude for feeding back waveform with frequency component and set
Determine threshold amplitude.
7. a kind of control method based on IQ electrooptic modulator quadrature voltages according to claim 6, it is characterised in that：Enter
One step includes step 6：The amplitude of the feedback waveform of monitor in real time and frequency component, if monitoring the feedback waveform with frequency component amplitude
Amplitude exceed setting threshold amplitude, the bias voltage applied on pi/2 phase modulation electrode is modified by step 5.
8. the control of a kind of control method based on IQ electrooptic modulator quadrature voltages described in a kind of application claim 1 is filled
Put, including IQ electrooptic modulators and feedback control circuit, it is characterised in that：The IQ electrooptic modulators include by I ways MZI and
Female MZI that Q ways MZI are formed in parallel, I ways MZI, Q way MZI, mother MZI have Q roads phase modulation electrode (5), I roads respectively
Phase modulation electrode (6), pi/2 phase modulation electrode (7), the feedback control circuit include photo-detector (9), block isolating circuit (10), band logical
Wave filter (11), high-speed ADC (12), central controller (13)；Wherein,
The photo-detector monitors the optical signal of the IQ electrooptic modulators output, and the photo-signal for obtaining is converted into photoelectricity
After pressure, output is to the block isolating circuit (10)；
The block isolating circuit (10) extracts the output of low speed AC small-signal to the band filter (11)；
The band filter (11) is extracted in ac small signal and frequency component waveform and exports the high-speed ADC
(12)；
The high-speed ADC (12) is sampled to the waveform being input into, by the output of obtain and frequency component amplitude to central authorities' control
Device (13) processed；
The central controller (13) is added to I roads phase modulation electrode (6), Q roads phase modulation electrode (5), pi/2 phase modulation electrode (7)
DC offset voltage, and apply frequency respectively for f to I roads phase modulation electrode (6), Q roads phase modulation electrode (5)1、f2Sine wave
Disturbance, wherein f1≠f2, apply square wave disturbance to pi/2 phase modulation electrode (7)；
The central controller (13) extract after applying disturbance and frequency component feedback square wave, to and frequency component feedback square wave width
Degree and phase place are judged：When square wave amplitude is fed back more than given threshold amplitude, adjustment pi/2 phase modulation electrode voltage is until feedback
Square wave amplitude is less than or equal to given threshold amplitude.
9. control device according to claim 8, it is characterised in that：Further include adder (10), I roads phase modulation
DC offset voltage and disturbance on electrode, Q roads phase modulation electrode, pi/2 phase modulation electrode is respectively by corresponding adder (10) coupling
Close.
10. control device according to claim 8, it is characterised in that：The band filter (11) is the super of high Q factor
Narrow band filter.
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| EP3447565A1 (en) * | 2017-08-24 | 2019-02-27 | Lumentum Operations LLC | Closed loop quadrature bias control for an iq phase modulator |
| CN110596918A (en) * | 2019-09-18 | 2019-12-20 | 武汉光迅科技股份有限公司 | Method and device for controlling bias operating point of modulator |
| CN110677196A (en) * | 2019-09-23 | 2020-01-10 | 北京工业大学 | Bias control method based on double parallel Mach-Zehnder modulator |
| CN111385028A (en) * | 2018-12-27 | 2020-07-07 | 深圳新飞通光电子技术有限公司 | Automatic bias control system and method for bipolar orthogonal Mach-Zehnder modulator |
| CN111682904A (en) * | 2020-05-14 | 2020-09-18 | 烽火通信科技股份有限公司 | Device and method for stabilizing amplitude of radio frequency signal of coherent optical module modulation driver |
| US10823987B2 (en) | 2017-08-24 | 2020-11-03 | Lumentum Operations Llc | Closed loop bias control for an IQ phase modulator |
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