CN104639252B - Optical modulator bias point locking means and system - Google Patents
Optical modulator bias point locking means and system Download PDFInfo
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- CN104639252B CN104639252B CN201310570898.1A CN201310570898A CN104639252B CN 104639252 B CN104639252 B CN 104639252B CN 201310570898 A CN201310570898 A CN 201310570898A CN 104639252 B CN104639252 B CN 104639252B
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Abstract
The embodiment of the invention discloses a kind of optical modulator bias point locking means and system.Wherein optical modulator bias point locking means, including：Obtain the sign bit of the output signal of optical modulator output end and the modulated signal of input modulation signal generator generation；The output signal is multiplied with the sign bit, obtain the cumulative of product and；Locking control is carried out to the direct current biasing point of the optical modulator according to the cumulative and corresponding matched curve slope and the correlation of optical modulator direct current biasing point phase on adjustment curve.The embodiment of the present invention can be realized can be biased a tracking lock when bias point is located at any point on adjustment curve.
Description
Technical field
The present invention relates to optical communication technique, more particularly to a kind of optical modulator bias point locking means and system.
Background technology
With the development of optical communication technique, the transmission of more and more big data quantities is carried out by optic communication.It is logical in light
In letter, optical modulator as optical device control section, its control performance be largely fixed transmission optical module property
Energy.The adjustment curve of optical modulator is sine wave curve, and the difference of adjustment curve is biased in by data-signal, can be obtained
Different modulation formats.Because optical device is influenceed by aging itself, ambient temperature and pressure etc., adjustment curve can produce with
The drift of machine, so as to cause modulation quality to reduce, influences service feature.Therefore, bias point is controlled（BIAS）On adjustment curve
Position fix turn into critical index.
Fig. 1 is the modulated process schematic diagram of optical transmission system in the prior art, as shown in figure 1, outside low frequency signal hair
Raw device（Low frequency sine wave generator in such as figure）Utilize the low frequency modulations of its generation（dither）Data signal generator
The data-signal to be sent produced carries out amplitude modulation(PAM), and am signals are sent to Mach- after drive amplification
The input of Zehnder modulators carries out light modulation, and the lightwave signal after light modulator modulates carries modulation intelligence and entered
Optical fiber is transmitted, and spectral module may separate out in the part optical signals of Mach-Zehnder modulator output ends, spectral module and set
Optical diode（PD）It can will detect that the optical signal obtained is converted into electric signal, the electric signal will by analog-digital converter (ADC)
The detection signal isolated transforms to numeric field and is sent to bias point tracing module；Bias point tracing module is first to Digital Detecting
Signal carries out LPF and filtered out after high-frequency signal, the phase of the dither signals produced further according to input low frequency generator
The position information area separates the positive half cycle and negative half-cycle signal of detection signal, and modulated signal valley point is exactly in finally according to when bias point
（null）When, the principle for the equal counteracting of luminous effect that positive and negative half period is brought, respectively by the positive half period signal distinguished and
Negative half-cycle signal is integrated, when positive half period signal and negative half-cycle signal integration and for 0 when represent direct current biasing point
（DC BIAS）Just fall the null points in modulated signal curve, when integrating and not falling within the null points of modulated signal curve,
The deviation of 0 value point of integration and deviation illustrates deviation of the DC BIAS points relative to null points, and the deviation for integrating sum is converted into electricity
The departure of pressure passes through digital analog converter（DAC）It is converted into the DC BIAS points to Mach-Zehnder modulators after analog signal
It is controlled, forms the tracking lock of close loop negative feedback direct current biasing point.
In the bias point locking means of above-mentioned modulated process, by being exactly in modulated signal valley point thus according to when bias point
（null）Or peak dot（peak）When, the principle for the equal counteracting of luminous effect that positive and negative half period is brought realizes locking, therefore, only
Be tracked locking when can realize and be located at particular point on adjustment curve to bias point, and to bias point on curve other
Locking can not be still tracked during meaning point.
The content of the invention
The embodiment of the present invention provides a kind of optical modulator bias point locking means and system, to realize that bias point is located at tune
A tracking lock can be biased on koji-making line during any point.
The first aspect of the present invention is to provide a kind of optical modulator bias point locking means, including：
Obtain the symbol of the output signal of optical modulator output end and the modulated signal of input modulation signal generator generation
Number position；
The output signal is multiplied with the sign bit, obtain the cumulative of product and；
According to the cumulative and corresponding matched curve slope and the optical modulator direct current biasing point on adjustment curve
The correlation of phase carries out locking control to the direct current biasing point of the optical modulator.
With reference to the optical modulator bias point locking means of first aspect, in the first implementation, according to cumulative and right
The correlation of the matched curve slope answered and optical modulator direct current biasing point phase on adjustment curve is to optical modulator
Direct current biasing point is carried out before locking control, in addition to：
To described cumulative and progress proportional-plus-integral loop filtering.
With reference to the optical modulator bias point locking means or the first implementation of first aspect of first aspect, second
Plant in implementation, before the output signal is multiplied with the sign bit, in addition to：
The output signal is carried out LPF to filter out the noise outside light modulator modulates signal frequency.
With reference to second of implementation of the optical modulator bias point locking means of first aspect, in the third implementation
In, LPF is carried out to the output signal with before filtering out the noise outside light modulator modulates signal frequency, in addition to：
The output signal is transformed into by data signal by analog to digital conversion；
Correspondingly, modulated according to the cumulative and corresponding matched curve slope and the optical modulator direct current biasing point
Before the correlation of phase is to the direct current biasing point progress locking control of the optical modulator on curve, in addition to：
The cumulative and corresponding matched curve slope is transformed into by analog signal by digital to analog conversion.
The second aspect of the present invention is to provide a kind of light modulation system, including：Modulation signal generator, for producing modulation
Signal simultaneously carries out amplitude modulation(PAM) to sent data-signal；
Optical modulator, for carrying out light modulation by the data-signal of amplitude modulation(PAM)；
Bias point locking device, for the modulated signal produced according to the modulation signal generator and the optical modulator
Output signal locking control is carried out to the direct current biasing point of the optical modulator；
The bias point locking device, including：
Acquisition module, is produced for obtaining the output signal and input modulation signal generator of optical modulator output end
The sign bit of modulated signal；
Computing module, for the output signal to be multiplied with the sign bit, obtain the cumulative of product and；
Locking module, for according to the cumulative and corresponding matched curve slope and the optical modulator direct current biasing point
The correlation of phase carries out locking control to the direct current biasing point of the optical modulator on adjustment curve.
With reference to the light modulation system of second aspect, in the first implementation, the bias point locking device also includes：
Proportional integration module, for described cumulative and progress proportional-plus-integral loop filtering.
With reference to the light modulation system or the first implementation of second aspect of second aspect, in second of implementation
In, the bias point locking device also includes：
Denoising module, for being filtered out to output signal progress LPF outside light modulator modulates signal frequency
Noise.
With reference to second of implementation of the light modulation system of second aspect, in the third implementation, the biasing
Point locking device also includes：
Analog to digital conversion module, for the output signal to be transformed into data signal；
Digital to analog conversion module, for the cumulative and corresponding matched curve slope to be transformed into analog signal.
The embodiment of the present invention by the way that the output signal of optical modulator is multiplied with the sign bit of input modulated signal,
Obtain the cumulative of product and, and modulated using cumulative and corresponding matched curve slope with the optical modulator direct current biasing point
The correlation of phase carries out locking control to the direct current biasing point of the optical modulator on curve, realizes and adjustment curve is taken up an official post
The locking of a bit, and this locking means can control in real time, and lock speed is very fast, and precision is higher.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is the accompanying drawing used required in technology description to be briefly described, it should be apparent that, drawings in the following description are this hairs
Some bright embodiments, for those of ordinary skill in the art, on the premise of not paying creative work, can be with root
Other accompanying drawings are obtained according to these accompanying drawings.
Fig. 1 is the modulated process schematic diagram of optical transmission system in the prior art；
Fig. 2 is the 0.1V that bias point is located at adjustment curveπWhen on point in feedback control loop each collection point oscillogram；
The flow chart for the optical modulator bias point locking means embodiment one that Fig. 3 provides for the present invention；
The flow chart for the optical modulator bias point locking means embodiment two that Fig. 4 provides for the present invention；
The structural representation for the light modulation system embodiment that Fig. 5 provides for the present invention；
Fig. 6 is the structural representation of bias point locking device first embodiment in Fig. 5；
Fig. 7 is the structural representation of bias point locking device second embodiment in Fig. 5；
Fig. 8 is the structural representation of the embodiment of bias point locking device the 3rd in Fig. 5；
The structural representation for the light modulation system Application Example that Fig. 9 provides for the present invention.
Embodiment
To make the purpose, technical scheme and advantage of the embodiment of the present invention clearer, below in conjunction with the embodiment of the present invention
In accompanying drawing, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is
A part of embodiment of the present invention, rather than whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art
The every other embodiment obtained under the premise of creative work is not made, belongs to the scope of protection of the invention.
In embodiments of the present invention, the bias point of the direct current biasing to make Mach-Zehnder optical modulators is located at modulation song
Locking can be tracked on line during any point to measure correspondingly with adjustment curve upper offset point, it is necessary to find, by this
The feedback loop of formation is measured to complete the locking for any point on adjustment curve.The following is acquisition and adjustment curve upper offset
The analysis process that point is measured correspondingly.
First, V is madein(t)=Vppsin(2πfmodT) it is with VppThe intensity amplitude of oscillation change low frequency sinusoidal modulated signal, for pair
Data-signal carries out amplitude modulation(PAM), and it inputs optical modulator after being multiplied and amplify with data-signal E (t)；VbiasFor Mach-Zehnder
Light modulator modulates curve bias point（bias）Control voltage, bias point VbiasIt is related to its position on adjustment curve, i.e., with
Its phase on adjustment curve is related, VπFor the half-wave voltage of Mach-Zehnder light modulator modulates curves, PInFor input
Luminous power, α is modulator optical power loss ratio, then Output optical power is metLight
The output signal of modulator output end feedback is adjusted signal after being multiplied and integrate with low-frequency modulation signal sign bitThe feedback principle designed according to phase-locked loop pll, it is desirable to S (t) slope and VBiasHave one
One corresponding relation.Even S (t) slope and VBiasThere is one-to-one relationship, thenExactly need to look for and adjustment curve
Upper offset point phase is measured correspondingly, so as to pass through feedbackTo adjust position of the direct current biasing point on adjustment curve
Put the tracking lock of achievable bias point.
Make Y=cos [asin (2 π fmod·t)+b]=cos[asin(2πfmod·t)]cos(b)-sin[asin(2πfmod·
T)] sin (b), whereinDue to cos [asin (2 π fmodT)] cos (b) cycle be f=
2fmod, span [cos (a) cos (b), cos (b)], sin [asin (2 π fmodT)] sin (b) cycle is f=fmod, take
It is worth scope [- sin (b) sin (a), sin (b) sin (a)], then Y ≈ [1-cos (a)] cos (4 π fmodt)-sin(b)sin(a)sin
(2πfmodt)。
To Ysign (Vin(t)) integrate, ∫ [1-cos (a)] cos (4 π fmodt)·sign[sin(2πfmodT)] dt still
For periodic function, and
N is to contain 4f in constant, therefore S (t)modSin (a) sin (b) t, neglect radio-frequency component, its slopeWith VBiasThere is one-to-one relationship, so thatIt is exactly to need to look in backfeed loop
Measured correspondingly with adjustment curve upper offset point.
Illustrate the feedback control loop operation principle of the invention described above with the waveform of each collection point in feedback control loop.Fig. 2 is biasing
0.1V of the point positioned at adjustment curveπWhen on point in feedback control loop each collection point oscillogram, Fig. 2（a）It is shown that bias point VBias
Positioned at the 0.1V of input adjustment curveπAt point, Fig. 2（c）It is shown that the waveform of the dither electric signals for locking, Fig. 2
（b）It is shown that dither signals are modulated onto the waveform on optical signal, Fig. 2 after optical modulator（d）What middle waveform C was shown
It is the electric signal converted by optical diode, the sign bit of dither signals, Fig. 2 is shown in waveform D（e）It is shown that Fig. 2
（d）The product term integral result of the electric signal that middle waveform C is represented and the waveform D sign bits represented, the product term integral result is used
Least square fitting, which is one, has a straight line of certain noise, and the straight slope is 70.Using similar method, when inclined
Put and be a little located at 0.2VπThe straight slope that fitting can be obtained when on point is 120, when bias point is located at other, can equally be obtained
Different straight slopes are taken, that is, the straight slope and the phase of bias point being fitted have one-to-one relationship, further illustrate logical
The locking for any point on adjustment curve can be completed by crossing structure S (t) feedback control loop.
The flow chart for the optical modulator bias point locking means embodiment one that Fig. 3 provides for the present invention, as shown in figure 3, this
The method of embodiment includes：
The modulation of step 101, the output signal for obtaining optical modulator output end and the generation of input modulation signal generator
The sign bit of signal.
The output signal of optical modulator output end can be believed the light decomposited by the optical diode set in spectral module
Number electric signal is converted to, includes the information of input modulated signal in the electric signal, the frequency of such as modulated signal, while
Any point on adjustment curve can be obtained by the phase information of input dither signals in bias point locking backfeed loop to adjust
The sign bit of signal processed.
Step 102, the output signal is multiplied with the sign bit, obtain the cumulative of product and.
In the feedback loop, it can use multiplier that the sign bit of the output signal of acquisition and input modulating signal is carried out into phase
Multiply, then by integrator by product be integrated acquisition it is cumulative and.
Step 103, adjusted with the optical modulator direct current biasing point according to described cumulative and corresponding matched curve slope
The correlation of phase carries out locking control to the direct current biasing point of the optical modulator on koji-making line.
Using least square method is to the cumulative of acquisition and is fitted, matched curve is obtained, it is oblique due to the matched curve
Rate and the phase of adjustment curve are corresponded, therefore, are existed and the phase when bias point is located at any point on adjustment curve
The corresponding matched curve slope in position, so as to the slope according to matched curve and bias point on adjustment curve phase it is related
Property adjusts the direct current biasing point of optical modulator, realizes the tracking lock of any point on adjustment curve.Need to add up in the prior art
Dozens or even hundreds of point carries out Integral Processing, extracts variation tendency, and one side precision is difficult to ensure that, on the other hand integration points
More lock speed is slower, by contrast, and the method for the embodiment of the present invention is according to the feedback of product term, and by accumulation process just
It may be made directly on Bias point control, real-time control can be realized, not only precision is high, and lock speed is very fast.
The embodiment of the present invention by the way that the output signal of optical modulator is multiplied with the sign bit of input modulated signal,
Obtain the cumulative of product and, and modulated using cumulative and corresponding matched curve slope with the optical modulator direct current biasing point
The correlation of phase carries out locking control to the direct current biasing point of the optical modulator on curve, realizes and adjustment curve is taken up an official post
The locking of a bit, and this locking means can control in real time, and lock speed is very fast, and precision is higher.
The flow chart for the optical modulator bias point locking means embodiment two that Fig. 4 provides for the present invention, as shown in figure 4, this
The method of embodiment has still further comprised analog-to-digital conversion, digital-to-analogue conversion, low pass filtered on the basis of above-described embodiment one and involved
The process of PI loop filterings, specifically, the method for the present embodiment include：
The modulation of step 201, the output signal for obtaining optical modulator output end and the generation of input modulation signal generator
The sign bit of signal.
Step 202, the output signal is transformed into by data signal by analog to digital conversion.
Step 203, the data signal to the output signal carry out LPF to filter out light modulator modulates signal frequency
Noise outside rate.
The HFS in output signal can be filtered out by LPF, the signal value of output end modulated signal is obtained, should
The frequency of signal value is identical with input modulated signal dither signal frequencies.
Step 204, filtered output signal is multiplied with the sign bit, obtain the cumulative of product and.
Step 205, to described cumulative and carry out proportional integration（PI）Loop filtering.
Steady-state error can effectively be eliminated using PI loop filterings, it is ensured that the locking precision of loop.
Step 206, according to the cumulative and corresponding matched curve slope and the optical modulator direct current after PI loop filterings
The correlation of bias point phase on adjustment curve carries out locking control to the direct current biasing point of the optical modulator.
The embodiment of the present invention is on the basis of the technique effect of above-described embodiment one is reached, further by feedback control loop
Middle increase analog-to-digital conversion and digital-to-analogue conversion realize the signal digital processing during closed loop is calculated, and output letter is filtered out by LPF
Number HFS advantageously reduce the frequency of other in close loop control circuit introducing calculation error, by setting PI loop filterings
Further increase the locking precision of feedback control loop.
The structural representation for the light modulation system embodiment that Fig. 5 provides for the present invention, Fig. 6 is bias point locking dress in Fig. 5
The structural representation of first embodiment is put, as it can be seen in figures 5 and 6, the light modulation system of the present embodiment includes：Modulated signal occurs
Device 300, optical modulator 100 and bias point locking device 200, wherein, modulation signal generator 300, for producing modulation letter
Number and to sent data-signal carry out amplitude modulation(PAM)；Optical modulator 100, for entering by the data-signal of amplitude modulation(PAM)
Row light modulation；Bias point locking device 200, is adjusted for the modulated signal produced according to the modulation signal generator and the light
The output signal of device processed carries out locking control to the direct current biasing point of the optical modulator.In the present embodiment, bias point locking dress
Putting 200 includes：Acquisition module 10, computing module 20 and locking module 30, wherein, acquisition module 10, for obtaining optical modulator
The sign bit for the modulated signal that the output signal and input modulation signal generator of output end are produced；Computing module 20, is used for
The output signal is multiplied with the sign bit, obtain the cumulative of product and；Locking module 30, for according to described tired
Plus with the correlation of corresponding matched curve slope and optical modulator direct current biasing point phase on adjustment curve to described
The direct current biasing point of optical modulator carries out locking control.
In the present embodiment, modulation signal generator 300 produces modulated signal, and enters line amplitude to sent data-signal
Modulation, the modulated signal is Low Frequency Sine Signals, and 100 pairs of data-signals by amplitude modulation(PAM) of optical modulator carry out light modulation,
The bias point of adjustment curve is tracked locking, bias point lock under the control of bias point locking device 200 during light modulation
Determine device 200 and locking control is carried out using negative feedback control mechanisms, that is, pass through the output signal by optical modulator 100 of sampling is detected
Certain calculating is carried out with the sign bit of the modulated signal of input, the adjustment signal for being controlled to bias point is obtained, and
Locking control is carried out to bias point using the adjustment signal of acquisition and the corresponding relation of bias point phase.In the present embodiment, partially
The acquisition module 10 put in a locking device 200 obtains the output signal of Mach-Zehnder optical modulators, and extracts input
For the sign bit of the dither signals of modulation, output signal that computing module 20 obtains acquisition module and dither signals
Sign bit is multiplied, and integrate obtain the cumulative of product and, due to the cumulative and corresponding matched curve slope and modulation song
The phase of the direct current biasing point of line has corresponding relation, so that locking module 30 can be according to the slope and direct current biasing of matched curve
The correlation of point phase on adjustment curve carries out locking control to the direct current biasing point of optical modulator, complete direct current biasing with
Track is locked.
The light modulation system of the embodiment of the present invention can be used for the method for performing above-mentioned embodiment illustrated in fig. 3 one, and its work is former
The technique effect managed and reached is similar, is no longer described in detail.
Fig. 7 is the structural representation of bias point locking device second embodiment in Fig. 5, as shown in fig. 7, present embodiment
In bias point locking device on the basis of first embodiment shown in above-mentioned Fig. 6, still further comprise：Analog to digital conversion module
40, for the output signal to be transformed into data signal；Denoising module 80, for carrying out LPF to the output signal
To filter out the noise outside light modulator modulates signal frequency；PI modules 60, for described cumulative and progress proportional integration ring
Road is filtered；Digital to analog conversion module 70, for the cumulative and corresponding matched curve slope to be transformed into analog signal.
In present embodiment, the feedback signal for closed-loop control can be become data signal by analog to digital conversion module 40, with
It is easy in follow-up closed-loop control carry out data signal calculating processing, digital to analog conversion module 70 can will perform the anti-of digital processing
Feedforward control signal is converted into analog signal and is overlapped to realize the control to direct current biasing point with the output with DC bias circuit
System, denoising module 80, which can remove, influences the high-frequency noise of computational accuracy in bias point locking in backfeed loop, PI modules 60 can disappear
Except the steady-state error in closed-loop control, it is ensured that the locking precision of loop.
Fig. 8 is the structural representation of the embodiment of bias point locking device the 3rd in Fig. 5, as shown in figure 8, present embodiment
Bias point locking device include CPU50, memory 52, communication interface 54 and bus 53, wherein CPU50 can be used for perform on
The operating procedure in optical modulator bias point locking means embodiment is stated, memory 52 can be used for storing inclined with above-mentioned optical modulator
The corresponding programmed instruction of operating procedure in a locking means embodiment is put, communication interface 54 can be used for sending or receiving corresponding journey
Sequence instruction and data, bus 53 is used for the communication between each functional unit inside bias point locking device.
The structural representation for the light modulation system Application Example that Fig. 9 provides for the present invention, as shown in figure 9, the present embodiment
Light modulation system in, number generator produce data-signal after precoding by low frequency sine wave generator produce it is low
Frequency signal carries out amplitude modulation(PAM), and inputs Mach-Zehnder optical modulators after drive amplification, to make Mach-Zehnder
Optical modulator is operated in the range of linearity, and it need to be carried out to be to make direct current biasing point in adjustment curve in direct current biasing, the present embodiment
On immobilize, employ close loop negative feedback Bias point control, i.e., by bias point tracing module in figure to bias point carry out with
Position of the track with real-time lock bias point on adjustment curve.
Specifically, to realize negative feedback closed loop control, the output signal of Mach-Zehnder optical modulators is by light splitting mould
Block 607 is extracted, and the output signal of extraction is transformed into numeric field by ADC601, then filter out height by low-pass filtering module 602
Frequency noise, filters out the signal after noise as shown in waveform A in figure, and its frequency is identical with the low-frequency sine B of input frequency,
Low-frequency sine B is multiplied after symbol extraction module 605 extracts symbol with the waveform A for filtering out noise, and its product is by integration
Device 603 is integrated, that is, obtain it is cumulative and, then closed-loop control is carried out by PI loop filterings module 604, will finally pass through PI rings
The signal of road filtering is converted into analog signal by DAC606, and the analog signal and current direct current biasing are overlapped into realization
The control of bias point.
The light modulation system of the present embodiment can be used for realizing the technical scheme of any of the above-described embodiment, its operation principle and reach
The technique effect arrived is similar, is no longer described in detail.
Finally it should be noted that：The above embodiments are merely illustrative of the technical solutions of the present invention rather than is limited,
Although the present invention is described in detail with reference to preferred embodiments, it will be understood by those within the art that：Its according to
Technical scheme can so be modified or equivalent substitution, and these modifications or equivalent substitution can not also make to repair
Technical scheme after changing departs from the spirit and scope of technical solution of the present invention.
Claims (8)
1. a kind of optical modulator bias point locking means, it is characterised in that including：
Obtain the sign bit of the output signal of optical modulator output end and the modulated signal of input modulation signal generator generation；
The output signal is multiplied with the sign bit, obtain the cumulative of product and；
According to the cumulative and corresponding matched curve slope and optical modulator direct current biasing point phase on adjustment curve
Correlation locking control is carried out to the direct current biasing point of the optical modulator.
2. according to the method described in claim 1, it is characterised in that according to cumulative and corresponding matched curve slope and the light
The correlation of modulator direct current biasing point phase on adjustment curve carries out locking control to the direct current biasing point of optical modulator
Before, in addition to：
To described cumulative and progress proportional-plus-integral loop filtering.
3. method according to claim 1 or 2, it is characterised in that the output signal is subjected to phase with the sign bit
Before multiplying, in addition to：
The output signal is carried out LPF to filter out the noise outside light modulator modulates signal frequency.
4. method according to claim 3, it is characterised in that carry out LPF to the output signal to filter out light tune
Before noise outside device frequency modulating signal processed, in addition to：
The output signal is transformed into by data signal by analog to digital conversion；
Correspondingly, according to the cumulative and corresponding matched curve slope and the optical modulator direct current biasing point in adjustment curve
The correlation of upper phase is carried out to the direct current biasing point of the optical modulator before locking control, in addition to：
The cumulative and corresponding matched curve slope is transformed into by analog signal by digital to analog conversion.
5. a kind of light modulation system, it is characterised in that including：
Modulation signal generator, for producing modulated signal and carrying out amplitude modulation(PAM) to sent data-signal；
Optical modulator, for carrying out light modulation by the data-signal of amplitude modulation(PAM)；
Bias point locking device, for the defeated of the modulated signal that is produced according to the modulation signal generator and the optical modulator
Go out signal and locking control is carried out to the direct current biasing point of the optical modulator；The bias point locking device, including：
Acquisition module, for obtaining the modulation that the output signal and input modulation signal generator of optical modulator output end are produced
The sign bit of signal；
Computing module, for the output signal to be multiplied with the sign bit, obtain the cumulative of product and；
Locking module, for being adjusted according to the cumulative and corresponding matched curve slope and the optical modulator direct current biasing point
The correlation of phase carries out locking control to the direct current biasing point of the optical modulator on koji-making line.
6. system according to claim 5, it is characterised in that the bias point locking device also includes：
Proportional integration module, for described cumulative and progress proportional-plus-integral loop filtering.
7. the system according to claim 5 or 6, it is characterised in that the bias point locking device also includes：
Denoising module, for filtering out making an uproar outside light modulator modulates signal frequency to output signal progress LPF
Sound.
8. system according to claim 7, it is characterised in that the bias point locking device also includes：
Analog to digital conversion module, for the output signal to be transformed into data signal；
Digital to analog conversion module, for the cumulative and corresponding matched curve slope to be transformed into analog signal.
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| CN106936746B (en) * | 2015-12-31 | 2020-01-31 | 海思光电子有限公司 | method and device for locking phase bias point of DP-QPSK modulator |
| CN106411403B (en) * | 2016-07-11 | 2018-12-28 | 东南大学 | It is a kind of that transmission of visible light method is lightened based on the ultra-wide that slicing is moved |
| CN108270495B (en) * | 2018-01-29 | 2020-12-11 | 国家无线电监测中心乌鲁木齐监测站 | Background noise extraction method and system |
| CN108900253B (en) | 2018-07-19 | 2020-09-29 | 中国科学院西安光学精密机械研究所 | Multi-modulation format compatible high-speed laser signal generation system and method |
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