CN106712854A - Locking method and apparatus of random work points of MZI external modulator - Google Patents
Locking method and apparatus of random work points of MZI external modulator Download PDFInfo
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- CN106712854A CN106712854A CN201611183338.0A CN201611183338A CN106712854A CN 106712854 A CN106712854 A CN 106712854A CN 201611183338 A CN201611183338 A CN 201611183338A CN 106712854 A CN106712854 A CN 106712854A
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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
- H04B10/50572—Laser transmitters using external modulation using a feedback signal generated by analysing the optical output to control the modulating signal amplitude including amplitude distortion
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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
- H04B10/50577—Laser transmitters using external modulation using a feedback signal generated by analysing the optical output to control the phase of the modulating signal
Abstract
The invention discloses a locking method and apparatus of random work points of an MZI external modulator. The method comprises the following steps: superposing frequency f2 square wave crosstalk and frequency f1 square wave crosstalk on the MZI external modulator through an adder so as to generate total feedback square waves comprising f1 and f2 frequency components; among the total feedback square waves, extracting waveforms of optical power change caused by the frequency f1 square wave crosstalk as first-order feedback square waves, and extracting amplitude and phases of the first-order feedback square waves; extracting waveforms of the first-order feedback square waves along with time change as a second-order feedback method, and determining phases; traversing applied offset voltages, and when average amplitude of the first-order feedback square waves is the same as that of the f1 feedback square waves and their phases are the same, recording a type of a group of work points corresponding to voltage values; then monitoring a phase direction of the second-order feedback square waves and determining a type of another group of work points; and determining that common work points satisfying the voltage values and the phase direction conditions are locked according to an intersection of the types of two groups of work points. According to the invention, random work points of the MZI external modulator are locked.
Description
Technical field
The present invention relates to a kind of locking means and device of MZI external modulators operating point, more particularly to a kind of MZI external modulations
The locking means and device of meaning operating point are had a high regard for, the invention belongs to the communications field.
Background technology
Modulation technique is a kind of technology that signal loading is transmitted on carrier wave, and be carried in for low speed telecommunication number by realization
The function element of electric carrier wave is electric modulator at a high speed, and it is Electro-optical Modulation that electric signal is carried in be transmitted on optical signal
Device.Electrooptic modulator can be divided into two classes according to modulator structure, and a class is directly modulation, and another kind of is external modulation.Directly adjust
System generally refers to for intensity electrical signals to be directly used in driving laser, makes the strength signal of laser output light；And external modulator
It is then to allow laser stabilization to export, the light to output end is operated (electric absorption, interference mutually counteracting long etc.), obtains including letter
Number light, be carried in electric signal on light carrier be transmitted by realization.
Mach-Zender interferometer (MZI) structure, because it has a good extinction ratio, simple structure, small volume, easily
In integrated, extremely wide application is obtained in electrooptic modulator (external modulator) field.Single MZI optical textures are by input light
It is divided into two-way, two-way light is interfered through multiplex after the transmission of a segment distance.Change MZI two-way biography by applied voltage
The phase difference lost, thus it is possible to vary the intensity and phase of output light.For single MZI structures, it is allowed to be biased in output intensity minimum
Unglazed bias point, then add the bias of opposite polarity to two-arm, the polarity of periodically-varied two-arm bias can obtain luminous intensity
Constant, phase differs 180 ° of periodicity light signal, forms two phase modulation (BPSK) of light；It is allowed to be biased in electro-optical curve oblique
Rate maximum point, then add the bias of opposite polarity to two-arm, the polarity of periodically-varied two-arm bias, can obtain luminous intensity open,
Alternate periodicity light signal is closed, the switch intensity modulated (OOK) of light is formed.MZI structures can both realize simple phase/strong
Degree modulation format, such as BPSK, OOK, can also realize the higher order modulation formats of complexity, and such as PAM signals, QAM signals (needs parallel connection
MZI structures).
It is OOK and BPSK with most widest modulation formats for single MZI.Biasing (bias) work of modulator
Make point and generally require closed loop feedback control, modulator is operated in best effort state steadily in the long term.For electro-optic response line
The MZI external modulators (such as LN modulators) that the property preferable material of degree is made, usually there is following rule：During OOK operating conditions,
Bias will be placed in the point (quad points) of electro-optical response curve maximum slope, and during BPSK operating conditions, it is bent that bias will be placed in electro-optic response
Line minimum point (min points).Because these are in the specific position of electro-optical curve so that the real time control algorithms to bias become ratio
It is easier to, there are many schemes in the industry at present, MZI operating points is controlled, it is main to realize for bias being locked in 4 particular points：
Max points, min points, quad points (2).For 4 particular job points (max points, min points, quad points 2) of locking, industry is
There are a variety of technical schemes.A kind of commonplace scheme is：Disturbed plus square wave on bias voltages, monitoring optical power feedback
Square-wave waveform.The locking means of min points：When feeding back square wave and being in the same direction with disturbance, reduce bias, when feedback square wave is reverse with disturbance
When, increase bias, until the amplitude for feeding back square wave is minimum (being theoretically close to 0), now bias is locked in min operating points, min
The feedback square waveform of the bias disturbance square waves 7 under operating point is the feedback square wave 10 of min operating points；The locking means of max points：
Disturbed plus square wave on bias voltages, monitoring optical power feedback square-wave waveform, when feeding back square wave and being in the same direction with disturbance, increases
Bias, when feeding back square wave and being reverse with disturbance, reduces bias, amplitude minimum (being theoretically close to 0) until feeding back square wave, this
When bias be locked in max operating points, the feedback square waveform of the bias disturbance square waves 9 of max operating points is the feedback side of max operating points
Ripple 12；The locking means of quad points：When feedback square wave amplitude is maximum, and, now bias is in quad2 works with disturbance square wave in the same direction
Make a little, when feedback square wave amplitude is maximum, and, now bias is in quad1 operating points, under quad operating points with disturbance square wave reversely
Bias disturbance square wave 8 feedback square waveform for quad2 operating points feedback square wave 11；However, for some materials and structure
The MZI of making, the linearity of its electro-optical response curve is not fine so that the operating point of modulator, is not above-mentioned 4 special
Point, the autobias control of such modulator just seems relatively difficult.
The content of the invention
A kind of locking means and its device of MZI external modulators operating point are invented, can have been realized on modulator electro-optical curve
The locking of any operating point.
The technical scheme is that：
A kind of locking means of any operating point of MZI external modulators, comprise the following steps：Step 1, initialization make outside MZI
Modulator is in optimum Working；Step 2, to being superimposed frequency f on MZI outer modulator bias voltages1Square wave crosstalk, read
Feed back the amplitude A of square wave0And phase；Step 3, by frequency f2Square wave crosstalk and frequency f1Square wave crosstalk pass through adder phase
Plus after be superimposed upon in MZI external modulators, produce include f1And f2Total feedback square wave of frequency component, wherein frequency f2Much smaller than frequency
Rate f1；Step 4, the extraction frequency f in total feedback square wave1Square wave crosstalk cause the waveform of optical power change to be fed back as single order
Square wave, extracts the amplitude that single order feeds back square wave, frequency f2Square wave crosstalk when being in high level, single order feedback square wave amplitude is
Ah1, frequency f2Square wave crosstalk when being in low level, single order feedback square wave amplitude is Al1, calculate acquisition single order feedback square wave and put down
Equal amplitude A1=(Ah1+Al1)/2；Compare single order feedback square wave and f1Same/the inverse relationship of crosstalk square wave phase, extracts single order anti-
Present the phase of square wave；The waveform that single order feedback square wave amplitude is changed over time is extracted as second order feedback square wave, is compared
Second order feedback square wave and frequency f2Square wave crosstalk same/inverted relationship phase, extract second order feedback square wave phase；Step
5th, traversal puts on the bias voltage of MZI external modulators in a voltage cycle, when single order feeds back the average amplitude A of square wave1
With A0During identical and identical phase, the corresponding one group of possible work vertex type of the magnitude of voltage is recorded；Then by monitoring second order
The phase directional for feeding back square wave determines another group of possible work vertex type；By this two groups common factors of possible work vertex type
It is determined that meeting the common working point for meeting the magnitude of voltage and phase directional condition, the operating point is locked.
The extracting method of the second order feedback square wave phase is：Compare second order feedback square wave and frequency f2Square wave crosstalk
With/inverted relationship；Frequency f2Square wave crosstalk when being in high level, second order feedback square wave level is Ah2；Frequency f2Square wave train
Disturb when being in low level, second order feedback square wave level is Al2；Work as Ah2More than Al2When, the phase of second order feedback square wave be it is in the same direction,
Work as Ah2Less than Al2When, the phase of second order feedback square wave is reverse.
The initialization procedure is：Apply radio frequency signals drive, auxiliary sampling oscillograph observation waveform to MZI external modulators
Eye pattern carries out judgement operating conditions, hand adjustment bias voltage until reaching best effort state.
Square wave crosstalk speed is no more than the backlight spy that setting is monitored to MZI external modulator output lights in the step 2
Survey the bandwidth range of device, 10% of crosstalk amplitude no more than MZI external modulators biasing half-wave voltage.
F is used in the step 21The square wave crosstalk of=1KHz, amplitude 10mV.
The phase of the amplitude, phase and second order feedback square wave of the single order feedback square wave extracted in step 4, step 5 is carried out partially
Put the feedback regulation of voltage, real-time lock operating point.
The step 5 is to travel through bias voltage in 0.54V~1.125V in voltage cycle.
A kind of device of the locking means of any operating point of MZI external modulators, including control unit, back light detector, control
Unit processed performs following process：Initialization, makes modulator be in optimum Working；To being superimposed frequency on modulator bias voltage
f1Square wave crosstalk, read feedback square wave amplitude A0And phase；By frequency f2Square wave crosstalk and frequency f1Square wave crosstalk pass through
Adder is superimposed upon in MZI external modulators after being added, and is produced and is included f1And f2Frequency component total feedback square wave；Fed back always
Frequency f is extracted in square wave1Square wave crosstalk cause the waveform of optical power change to feed back square wave as single order, extract single order feedback side
The amplitude of ripple, frequency f2Square wave crosstalk when being in high level, single order feedback square wave amplitude is Ah1, frequency f2Square wave crosstalk at
In low level, single order feedback square wave amplitude is Al1, calculate and obtain single order feedback square wave average amplitude A1=(Ah1+Al1)/2；
Compare single order feedback square wave and frequency f1Square wave crosstalk same/reverse phase relation, extract single order feed back square wave phase；Will
The waveform that single order feedback square wave amplitude is changed over time is extracted as second order feedback square wave, compares second order feedback square wave and frequency
Rate f2Square wave crosstalk same/inverted relationship phase, extract second order feedback square wave phase；Traversal puts on MZI external modulations
The bias voltage of device, when single order feeds back the average amplitude A of square wave1With A0During identical and identical phase, the magnitude of voltage is recorded corresponding
One group of possible work vertex type；Then the possible work of another set is determined by monitoring the phase directional of second order feedback square wave
Vertex type；Determine to meet by the common factor of this two groups possible work vertex types and meet the magnitude of voltage and phase directional condition
Common working point, locks the operating point.
The back light detector carries out the detection of MZI external modulator signal light powers, is about using 3dB photoelectricity bandwidth
400MHz, responsiveness about 1A/W, external tap PD of the dark current index less than 100nA under normal temperature.
The back light detector uses bandwidth in the low speed photo-detector of 1MHz magnitudes.
It is an advantage of the invention that：
The invention provides a kind of locking means of MZI external modulators operating point, can realize being removed on modulator electro-optical curve
The locking of any operating point outside four particular points (max points, min points, quad points 2), is adapted to various materials and structure
The MZI external modulators of making.
Brief description of the drawings
Fig. 1 is the basic structure schematic diagram of MZI external modulators of the present invention；
Fig. 2 is 4 locking means of particular job point of the present invention based on square wave dither；
Fig. 3 is no special operating point of the present invention plus corresponding optical power feedback square wave after square wave disturbance；
Fig. 4 is that luminous power of the present invention and single order feed back square wave amplitude with the variation rule curve of modulator bias voltages；
Fig. 5 is bias disturbances of the present invention, always feedback square wave, the waveform of second order feedback square wave；
Wherein：
1:The input of MZI external modulators； 2:MZI external modulator traveling wave electrodes；
3:Phase modulation electrode； 4:Terminal coupling resistance；
5:Back light detector (MPD)； 6:The output end of MZI external modulators；
7:Bias disturbance square waves under min operating points； 8:Bias disturbance square waves under quad operating points；
9:Bias disturbance square waves under max operating points； 10:The feedback square wave of min operating points；
11:The feedback square wave of quad2 operating points； 12:The feedback square wave of max operating points；
Specific embodiment
The locking means of any operating point of MZI external modulators in invention are made in detail with reference to embodiment and accompanying drawing
Illustrate, in embodiment, we employ certain bill of materials MZI modulator of 10G speed；
Fig. 1 is the basic structure schematic diagram of MZI external modulators；Input 1 of the light that laser sends from MZI external modulators
Into MZI external modulators, phase modulation electrode 3 can be adjusted to the bias voltages of MZI external modulators, and electric high frequency signal is by row
Wave electrode 2 is carried in the two-arm of MZI external modulators (symmetrical operation pattern), and the end of traveling wave electrode is connected with terminal coupling electricity
Resistance 4, the output end 6 of the modulator optical signals MZI external modulators of modulator is exported, and output light has divided a part to backlight
Detector 5, carries out the detection of signal light power；
In embodiment, the photo-detector that back light detector 5 is used is external tap PD, and 3dB photoelectricity bandwidth is about
400MHz, responsiveness about 1A/W, dark current index is less than 100nA under normal temperature；
Fig. 2 is 4 locking means of particular job point based on square wave shake (dither)；Fig. 3 is non-particular job point
Corresponding optical power feedback square wave after being disturbed plus square wave, Fig. 4 is luminous power and is not added with single order feedback square wave amplitude when f2 is disturbed
With the variation rule curve of modulator bias voltages；The work vertex type of modulator is B in embodiment, and quiescent potential is
1.123V, locking a little is operated to it, is comprised the following steps：
Step 1, test system initialization.By external light source, the ITLA tunable lasers of certain producer used in embodiment
Device, operation wavelength 1550.12nm, input to MZI external modulators, voltage-stabilized power supply enables pin and supplies accordingly to MZI external modulators
Electricity, the modulation principle of MZI external modulators is free carrier effect of dispersion in embodiment, and voltage-stabilized power supply is needed in advance to outside MZI
Electricity on modulator waveguide PN junction；After electricity is normal on MZI external modulator direct currents, with 10G yards of source, with reference to radio frequency amplifier, embodiment
Certain model radio frequency driver of the Centallax companies of middle selection, suitable radio frequency signals drive is added to MZI external modulators；
Bias voltages are adjusted manually so that MZI external modulators are in optimum Working, in embodiment, use auxiliary sampling oscillograph
Judge whether MZI external modulators are in BPSK operating conditions to observe waveform eye pattern；
Step 2, to being superimposed frequency f on MZI external modulator bias voltages1Square wave dither, square wave speed is being no more than
Back light detector (MPD) bandwidth range is limited, 10% of dither amplitudes no more than modulator bias half-wave voltages；Embodiment
In, frequency f1Square wave dither parameters be：f1=1KHz, amplitude 10mV；By MPD back-end circuits, best effort state pair is read
The feedback square wave amplitude A0 and phase for answering are (relative to f1Dither signals it is same/anti-phase)；Write down the feedback square wave amplitude and phase
Position, as the standard of subsequent step feedback control；In embodiment, bias=1.123V under best effort state is not added with f2During disturbance
Single order feedback square wave amplitude A0=847 μ V, phase is：In the same direction；
Step 3, bias voltage bias is set to initial point, bias=1V is made in embodiment；By frequency f2=100Hz,
The square wave dither and frequency f of amplitude 15mV1Square wave dither be added by adder, f2 need to be much smaller than f1, it is superimposed upon bias
On direct current pin, by MPD back-end circuits, the total feedback square wave of monitoring, total feedback square wave is defined as, and is caused by bias dither
Modulator Output optical power change, monitored by MPD back-end circuits.In embodiment, the waveform the inside of total feedback square wave occurs
F1And f2Frequency component, the total feedback square-wave waveform figure in such as Fig. 5.
Step 4, single order feedback square wave are defined as, by f1Change (the f of luminous power caused by dither2Shock wave is too slow,
It is considered direct current, extracts the f in total feedback square wave1AC compounent), second order feedback square wave is defined as, single order feedback square wave amplitude
Change with time.Waveform is as shown in Figure 5.Amplitude and phase that single order feeds back square wave, and second order are extracted in total feedback square wave
Feed back the phase of square wave.The extracting method of the amplitude of single order feedback square wave：Will in total feedback square wave f1Light caused by dither
Out, the waveform is that single order feeds back square wave to the waveform extracting of the change of power.Extract the amplitude that single order feeds back square wave, f2dither
When being in high level, single order feedback square wave amplitude is Ah1, f2When dither is in low level, single order feedback square wave amplitude is Al1,
Single order feedback square wave average amplitude A1=(Ah1+Al1)/2；Extract single order feedback square wave phase, its extracting method：Compare single order anti-
Feedback square wave and f1Same/the inverse relationship of dither square wave phases；The extracting method of second order feedback square wave phase：By single order feedback side
Wave amplitude changes with time and is extracted into waveform, and the waveform is second order feedback square wave, extracts the phase that rank feeds back square wave, extracts phase
Position process be：Compare second order feedback square wave and f2Same/the inverted relationship of dither；f2When dither is in high level, second order feedback
Square wave level is Ah2；f2When dither is in low level, second order feedback square wave level is Al2；Work as Ah2More than Al2When, second order is anti-
It is in the same direction to present the phase of square wave, works as Ah2Less than Al2When, the phase of second order feedback square wave is reverse；Outside 4 particular job points
, there is Ah operating point2≠Al2；
Step 5, as shown in figure 4, we are by a cycle (curve between two min points) of " P-bias " curve, by
Max and two quad point is divided into four sections of intervals, and A, B, C, D are respectively four sections of four class operating points of interval class.In a voltage
In cycle, bias voltages are traveled through, when the average amplitude that the single order that step 4 is extracted feeds back square wave is identical with step 2, i.e. A1=A0
And phase it is identical when, write down bias point magnitudes of voltage, the bias points that this condition is met in a voltage cycle have two, the two
There is one in bias points for operating point, it is false point to have one, and the combination of two points is only B+C or A+D.By monitoring second order
Feedback square wave phase excludes false point：Second order feedback square wave phase and f that step 4 is extracted2When dither is in the same direction, work vertex type is
A or C；Second order feedback square wave and f2Reversely, work vertex type is B or D to dither；It is determined that satisfaction meets the magnitude of voltage and phase
The common working point of direction condition, so we just have found unique working point；In embodiment, we are in 0.54V~1.125V
This voltage cycle travels through bias voltages, when obtaining bias=0.622V and bias=1.123V, the single order feedback average width of square wave
Value A1=A0=847 μ V, the two point types be respectively C and B, we further monitor second order feedback square wave with
f2Reversely, that is, the vertex type that works is B or D to dither；To sum up, we find a job vertex type B, and operating voltage is 1.123V；
Step 6, the amplitude that square wave is fed back by monitoring single order, single order feed back the phase of square wave, the phase of second order feedback square wave
Position, carries out the feedback regulation of bias, real-time lock operating point；
Although the present invention detailed example and describe correlation specific embodiment make reference, to the technology of this area
For personnel, after the specification and drawings are read and understood, particularly above-mentioned without departing substantially from thought of the invention and scope
Device is implemented functionally, to be variously modified on device form and details.These changes fall within of the invention
Protection domain required by claim.
Claims (10)
1. a kind of locking means of any operating point of MZI external modulators, it is characterised in that：Comprise the following steps：
Step 1, initialization make MZI external modulators be in optimum Working；
Step 2, to being superimposed frequency f on MZI outer modulator bias voltages1Square wave crosstalk, read feedback square wave amplitude A0And phase
Position；
Step 3, by frequency f2Square wave crosstalk and frequency f1Square wave crosstalk by adder be added after be superimposed upon MZI external modulations
On device, produce and include f1And f2Total feedback square wave of frequency component, wherein frequency f2Much smaller than frequency f1；
Step 4, the extraction frequency f in total feedback square wave1Square wave crosstalk cause the waveform of optical power change as single order feedback side
Ripple, extracts the amplitude that single order feeds back square wave, frequency f2Square wave crosstalk when being in high level, single order feedback square wave amplitude is Ah1,
Frequency f2Square wave crosstalk when being in low level, single order feedback square wave amplitude is Al1, calculate and obtain the single order feedback average width of square wave
Value A1=(Ah1+Al1)/2；Compare single order feedback square wave and f1Same/the inverse relationship of crosstalk square wave phase, extracts single order feedback side
The phase of ripple；The waveform that single order feedback square wave amplitude is changed over time is extracted as second order feedback square wave, compares second order
Feedback square wave and frequency f2Square wave crosstalk same/inverted relationship phase, extract second order feedback square wave phase；
Step 5, traversal puts on the bias voltage of MZI external modulators in a voltage cycle, flat when single order feedback square wave
Equal amplitude A1With A0During identical and identical phase, the corresponding one group of possible work vertex type of the magnitude of voltage is recorded；Then by prison
The phase directional for controlling second order feedback square wave determines another group of possible work vertex type；By this two groups possible work vertex types
Common factor determine to meet and meet the common working point of the magnitude of voltage and phase directional condition, lock the operating point.
2. a kind of locking means of any operating point of MZI external modulators according to claim 1, it is characterised in that：Described two
Rank feedback square wave phase extracting method be：Compare second order feedback square wave and frequency f2Square wave crosstalk same/inverted relationship；Frequently
Rate f2Square wave crosstalk when being in high level, second order feedback square wave level is Ah2；Frequency f2Square wave crosstalk when being in low level,
Second order feedback square wave level is Al2；Work as Ah2More than Al2When, the phase of second order feedback square wave is in the same direction, works as Ah2Less than Al2When, two
The phase of rank feedback square wave is reverse.
3. a kind of locking means of any operating point of MZI external modulators according to claim 1, it is characterised in that：It is described first
Beginning process is：Apply radio frequency signals drive to MZI external modulators, auxiliary sampling oscillograph observation waveform eye pattern carries out judgement work
Pose, hand adjustment bias voltage is until reach best effort state.
4. a kind of locking means of any operating point of MZI external modulators according to claim 1, it is characterised in that：The step
Square wave crosstalk speed is no more than the bandwidth range of the back light detector that setting is monitored to MZI external modulator output lights in rapid 2,
10% of crosstalk amplitude no more than MZI external modulators biasing half-wave voltage.
5. according to one of any a kind of locking means of any operating point of MZI external modulators, its feature in claim 1-4
It is：F is used in the step 21The square wave crosstalk of=1KHz, amplitude 10mV.
6. a kind of locking means of any operating point of MZI external modulators according to claim 1, it is characterised in that：In step 4
The phase of the amplitude, phase and second order feedback square wave of the single order feedback square wave of extraction, the feedback that step 5 is biased voltage is adjusted
Section, real-time lock operating point.
7. a kind of locking means of any operating point of MZI external modulators according to claim 1, it is characterised in that：The step
Rapid 5 is to travel through bias voltage in 0.54V~1.125V in voltage cycle.
8. a kind of device of the locking means of any operating point of MZI external modulators according to claim 1, it is characterised in that：
Including control unit, back light detector,
Control unit performs following process：Initialization, makes modulator be in optimum Working；Folded on modulator bias voltage
Plus frequency f1Square wave crosstalk, read feedback square wave amplitude A0And phase；By frequency f2Square wave crosstalk and frequency f1Square wave train
Disturb and be superimposed upon in MZI external modulators after adder is added, produce and include f1And f2Frequency component total feedback square wave；
Frequency f is extracted in total feedback square wave1Square wave crosstalk cause the waveform of optical power change to feed back square wave as single order, extract single order
Feed back the amplitude of square wave, frequency f2Square wave crosstalk when being in high level, single order feedback square wave amplitude is Ah1, frequency f2Square wave
When crosstalk is in low level, single order feedback square wave amplitude is Al1, calculate and obtain single order feedback square wave average amplitude A1=(Ah1+
Al1)/2；Compare single order feedback square wave and frequency f1Square wave crosstalk same/reverse phase relation, extract single order feedback square wave
Phase；The waveform that single order feedback square wave amplitude is changed over time is extracted as second order feedback square wave, compares second order feedback
Square wave and frequency f2Square wave crosstalk same/inverted relationship phase, extract second order feedback square wave phase；
Traversal puts on the bias voltage of MZI external modulators, when single order feeds back the average amplitude A of square wave1With A0Identical and phase phase
Meanwhile, record the corresponding one group of possible work vertex type of the magnitude of voltage；Then by monitoring the phase side of second order feedback square wave
To the determination possible work vertex type of another set；Determine that satisfaction meets institute by the common factor of this two groups possible work vertex types
The common working point of magnitude of voltage and phase directional condition is stated, the operating point is locked.
9. the device of any operating point locking means of a kind of MZI external modulators according to claim 8, it is characterised in that：Institute
Stating back light detector carries out the detection of MZI external modulator signal light powers, and 400MHz, responsiveness are about using 3dB photoelectricity bandwidth
About 1A/W, external tap PD of the dark current index less than 100nA under normal temperature.
10. a kind of locking means of any operating point of MZI external modulators according to claim 9, it is characterised in that：The back of the body
Photo-detector uses bandwidth in the low speed photo-detector of 1MHz magnitudes.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106506092A (en) * | 2016-12-22 | 2017-03-15 | 中国计量大学 | A kind of low noise radio-frequency light transmission module of wide temperature range work |
| CN106506092B (en) * | 2016-12-22 | 2019-01-18 | 中国计量大学 | A kind of low noise radio-frequency light transmission module of wide temperature range work |
| CN108306689A (en) * | 2018-01-13 | 2018-07-20 | 西安电子科技大学 | Double parallel Mach-Zehnder modulators based on three pilot tones（DPMZM）Arbitrary point autobias control method |
| CN108306689B (en) * | 2018-01-13 | 2020-08-11 | 西安电子科技大学 | Automatic bias control method for any point of double parallel Mach-Zehnder modulator (DPMZM) based on three pilot frequencies |
| CN111707360A (en) * | 2020-06-28 | 2020-09-25 | 中国电子科技集团公司第四十四研究所 | Method for measuring half-wave voltage of M-Z type light intensity modulator |
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| CN106712854B (en) | 2019-05-07 |
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