CN102394851A - Method, device and system for controlling bias point - Google Patents
Method, device and system for controlling bias point Download PDFInfo
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- CN102394851A CN102394851A CN2011103423273A CN201110342327A CN102394851A CN 102394851 A CN102394851 A CN 102394851A CN 2011103423273 A CN2011103423273 A CN 2011103423273A CN 201110342327 A CN201110342327 A CN 201110342327A CN 102394851 A CN102394851 A CN 102394851A
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Abstract
The invention discloses a method, device and system for controlling a bias point, wherein the method comprises the following steps: step A, adjusting the bias point of an RZ (return to zero) modulator; step B, comparing the average optical power derivative values adjusted and output by the RZ modulator before and after adjusting the bias point; and step C, adjusting the bias point of the RZ modulator according to the comparison result so as to lead the average optical power derivative values adjusted and output by the RZ modulator currently to be maximum. By the invention, the method for controlling the bias point which is simple to realize and high in accuracy and reliability, is provided.
Description
Technical field
The present invention relates to the communications field, in particular to a kind of control method, Apparatus and system of bias point.
Background technology
Along with the raising of optical transmission system speed and the increase of capacity, with QPSK the attention that the light phase modulation method of representative more and more receives industry.QPSK (Quadrature Phase Shift Keying; Be called for short QPSK) modulation technique; Four outs of phase with light signal are come transmission information; Therefore its code element speed has only the half the of traditional light amplitude modulation method, thereby has superior chromatic dispersion and polarization mode dispersion performance and higher band efficiency, is applicable to the optical transmission system of big capacity, long distance more.OSNR (Optical Signal-Noise Ratio for further raising system; Be called for short OSNR) performance; Industry QPSK (Return-to-zero QPSK, the be called for short RZ-QPSK) modulation technique that proposed to make zero is for some high performance system; Such as the system of 100G/s, NRZ is good selection.
In the RZ-QPSK modulating system, need modulate through lithium niobate modulator, as shown in Figure 1.Lithium niobate modulator is because self properties of materials, its transmission characteristic, and bias point can change with temperature and stress in other words, so must make the bias point of lithium niobate modulator relatively stable through certain method.Control method commonly used at present is the pilot signal that in the modulation signal of RZ modulator, adds multiple frequency; From the modulation signal of output, separate and analyze the information of these pilot signals or its difference frequency signal then; The change of feedback pilot signal, thus the control bias point is stable.Because need a plurality of pilot signals, so control loop is complicated, and pilot signal itself means that the stability of bias point is limited simultaneously.
The bias point difference of RZ-QPSK can obtain the NRZ signal of different duty.RZ modulation has duty ratio to be respectively 33.3%, 50% and 66.7% 3 kind of situation.Can obtain required high workload point through seeking the minimum average B configuration luminous power for 33.3%, can obtain required minimum working point through seeking maximum average optical power for 66.7%.And will be in the position of pi/2 for the bias point of 50% duty ratio.The stability of this bias point is directly connected to the performance of whole RZ-QPSK modulating system, thereby low cost, a reliable control method have great importance for the RZ-QPSK modulating system.
The limited and implementation method complicated problems of control stabilization degree to the RZ modulator bias point in the RZ-QPSK system in the correlation technique does not propose effective solution at present as yet.
Summary of the invention
To the limited and implementation method complicated problems of control stabilization degree of the RZ modulator bias point in the RZ-QPSK system, the invention provides a kind of control method, Apparatus and system of bias point, to address the above problem at least.
According to an aspect of the present invention, a kind of control method of bias point is provided, has comprised: the make zero bias point of RZ modulator of steps A, adjustment; Step B, relatively the average light power derivative value of RZ modulators modulate output light signal before and after the bias point adjustment; Step C according to the bias point of comparative result adjustment RZ modulator, makes the average light power derivative value maximum of the light signal of the current modulation output of RZ modulator.
Preferably; Bias point according to comparative result adjustment RZ modulator; Make the average light power derivative value maximum of the light signal of the current modulation output of RZ modulator; Comprise: whether the difference of judgement between the average light power derivative value of RZ modulators modulate output light signal before and after the bias point adjustment be less than predetermined value, if then keep the current bias point of said RZ modulator; Otherwise, according to the magnitude relationship of the average light power derivative value of RZ modulators modulate output light signal before and after the bias point adjustment, adjustment RZ modulator bias point.
Preferably; Magnitude relationship according to the average light power derivative value of RZ modulators modulate output light signal before and after the bias point adjustment; Adjustment RZ modulator bias point; Comprise: if adjusted average light power derivative value less than the preceding average light power derivative value of adjustment, then to adjusting RZ modulator bias point with the direction in the opposite direction of current adjustment, is returned step B; Or if adjusted average light power derivative value greater than the preceding average light power derivative value of adjustment, then to the direction adjustment RZ modulator bias point identical with the direction of current adjustment, is returned step B.
Preferably, the derivative value of the average light power through the following light signal that obtains RZ modulators modulate output: gather RZ modulators modulate output light signal; To the signal that the collects average light power value of the integration light signal that obtains exporting within a certain period of time; Above-mentioned average light power value is carried out difference processing, obtain the derivative value of above-mentioned average light power.
Preferably, when the bias point of adjustment RZ modulator, the step-length of each adjustment is identical.
Preferably, the bias point of adjustment is to make the RZ modulator obtain the bias point of the NRZ signal of 50% duty ratio.
According to a further aspect in the invention, a kind of control device of bias point is provided, has comprised: first adjusting module is used to adjust the bias point of RZ modulator of making zero; Comparison module is used for the average light power derivative value that comparison RZ modulators modulate before and after the bias point adjustment is exported light signal; Second adjusting module is used for the bias point according to comparative result adjustment RZ modulator, makes the average light power derivative value maximum of the light signal of the current modulation output of RZ modulator.
Preferably, second adjusting module comprises: judging unit is used to judge that whether difference between the average light power derivative value of RZ modulators modulate output light signal before and after the bias point adjustment is less than predetermined value; Keep the unit, being used in the judging unit result is under the situation that is, keeps the current bias point of RZ modulator; Adjustment unit, being used in the judging unit result is under the situation not, according to the magnitude relationship of the average light power derivative value of RZ modulators modulate output light signal before and after the bias point adjustment, adjusts RZ modulator bias point.
Preferably, adjustment unit is according to following rule adjustment RZ modulator bias point: if the average light power derivative value of adjusted average light power derivative value before less than adjustment, then to the direction adjustment RZ modulator bias point in the opposite direction of current adjustment; Or if adjusted average light power derivative value greater than the preceding average light power derivative value of adjustment, is then adjusted RZ modulator bias point to the direction identical with the direction of current adjustment.
According to another aspect of the present invention; A kind of control system of bias point is provided, has comprised: optical splitter, first transducer, digital processing unit and second transducer, wherein; Optical splitter is used for the RZ modulators modulate output light signal that makes zero is divided into output light signal and light signal fed back; First transducer is used for converting light signal fed back into the analog feedback signal of telecommunication, and converts the analog feedback electric signal power to the digital feedback electric signal power; Digital processing unit comprises the control device of above-mentioned bias point, is used to handle first transducer output digital feedback electric signal power and generates the digital feedback control signal; Second transducer is used for converting the digital feedback control signal of digital processing unit output into the analog feedback control signal, by the bias point of analog feedback control signal control RZ modulator.
Through the present invention; Average light power derivative value magnitude relationship according to the light signal of the output of the modulation before and after the RZ modulator bias point adjustment; Adjust the bias point of RZ modulator; When the average light power derivative value is maximum, obtain the bias point of required RZ modulator, its implementation is simple, accuracy is high and reliability is high.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes the application's a part, and illustrative examples of the present invention and explanation thereof are used to explain the present invention, do not constitute improper qualification of the present invention.In the accompanying drawings:
Fig. 1 is the sketch map according to RZ modulator structure in the RZ-QPSK system of correlation technique;
Fig. 2 is the sketch map according to the control system of the bias point of the embodiment of the invention;
Fig. 3 is the sketch map according to the control system of the bias point of the embodiment of the invention one;
Fig. 4 is the structured flowchart according to the control device of the bias point of the embodiment of the invention;
Fig. 5 is the control device preferred construction block diagram according to the bias point of the embodiment of the invention;
Fig. 6 is the flow chart according to the control method of the bias point of the embodiment of the invention;
Fig. 7 is the flow chart according to the control method of the bias point of the embodiment of the invention two.
Embodiment
Hereinafter will and combine embodiment to specify the present invention with reference to accompanying drawing.Need to prove that under the situation of not conflicting, embodiment and the characteristic among the embodiment among the application can make up each other.
For obtaining duty ratio is 50% NRZ signal, and under the RZ-QPSK modulation system, the bias point of RZ modulator need be placed on pi/2, and driven amplitude is generally V
π
If drive signal is:
Then average light power is:
Where
for the bias point relative to the
deviation.
Formula (2) after launching is:
It is thus clear that average light power concerns with the SIN function that departs from into of bias point point with respect to
.The average light power that sampling is obtained carries out difference processing, can obtain the derivative of (3) formula about
:
If formula (4) obtains maximum, promptly obtain the bias point of required RZ modulator.
According to the embodiment of the invention, a kind of control system of bias point is provided, this system is based on above-mentioned analysis, i.e. and the average light power derivative value of RZ modulators modulate output light signal can obtain the bias point of required RZ modulator when maximum.
Fig. 2 is the sketch map according to the control system of the bias point of the embodiment of the invention, and is as shown in Figure 2, and this system comprises: optical splitter 10, first transducer 20, digital processing unit 30 and second transducer 40.Wherein, optical splitter 10 is used for the RZ modulators modulate output light signal that makes zero is divided into output light signal and light signal fed back; First transducer 20 with optical splitter 10 coupling, is used for converting the light signal fed back of optical splitter 10 outputs into the analog feedback signal of telecommunication, and will feed back electric signal power and convert the digital feedback electric signal power to; Digital processing unit 30 with 20 couplings of first transducer, is used to handle the digital feedback electric signal power generation digital feedback control signal of first transducer, 20 conversion gained, and the bias point of adjustment RZ modulator makes that the derivative value of feedback electric signal power is maximum; Second transducer 40 with digital processing unit 30 couplings, is used for converting the digital feedback control signal of digital processing unit 30 outputs to the analog feedback control signal, by the bias point of this analog feedback control signal control RZ modulator.
Pass through the embodiment of the invention; Utilize optical splitter 10 that RZ modulators modulate output light signal is divided into two bundles; A branch of a branch of is light signal fed back in order to export light signal, and light signal fed back converts the feedback signal of telecommunication to behind first transducer 20; Further will feed back electric signal power and convert the digital feedback electric signal power to by first transducer 20; By digital processing unit 30 above-mentioned digital feedback signal power and generate the digital feedback control signal, second transducer 40 converts the digital feedback control signal to the analog feedback control signal, by the bias point of this analog feedback control signal adjustment RZ modulator; Make that the derivative value of feedback electric signal power is maximum, can obtain stable RZ modulator bias point.This system need not add any pilot signal, utilizes digital processing unit to realize, makes that realization is simple, cost is low and reliability is high.
Describe through specific embodiment below.
Embodiment one
Fig. 3 is the sketch map according to the control system of the bias point of the embodiment of the invention one; As shown in Figure 3, this system comprises: laser 50, QPSK unit 60, clock 70, RZ modulator 80, coupler 90 (being equivalent to the optical splitter 10 among Fig. 2), high speed PIN manage 100 (being equivalent to first transducer 20 among Fig. 2), analog to digital converter AD 110 (being equivalent to first transducer 20 among Fig. 2), digital signal processing chip DSP 120, digital-to-analogue conversion DA 130 (being equivalent to second transducer 40 among Fig. 2).
The light signal E that sends from laser 40
InPhase modulated signal E through a QPSK unit 60 output non-return-to-zeros
NRZE then
NRZSignal is through the E of RZ modulator output NRZ after 80s
RZSignal, this signal are again through 90 outputs of 5/95 coupler
With
Wherein 95% export light
Be used for final RZ-QPSK modulation output, and 5% output light
Carry out opto-electronic conversion through high speed PIN pipe 100; Utilize high-precision AD 110 that this power collecting is advanced digital signal processing chip DSP 120 then; DSP 120 adjustment bias point feedback control signals convert the bias point of analog voltage signal control RZ modulator 80 into through DA 130; Make finally to detect to such an extent that the average power derivative is maximum, can realize obtaining the correct bias of 50% duty ratio.
Through the present invention is the bias point control system of the RZ modulator of embodiment, realizes based on average power detection and digital processing.Compare with other system, such as: utilize the system of the variations in temperature of thermistor feedback RZ modulator, it is simple flexibly to have high accuracy, high reliability, high-responsivity and a control loop, is beneficial to advantages such as debugging.The system of this RZ-QPSK modulator can be fast, stable, realize locking to the bias point of 50% duty ratio not being subject to the built-in PD bandwidth of modulator simultaneously accurately, the transmission of 100G dense wavelength division system is had great importance.
According to the embodiment of the invention; A kind of control device of bias point also is provided; This device can be arranged in the digital processing unit (being the digital processing element 30 of Fig. 2 or the DSP 110 of Fig. 3) of the control system of the bias point that the foregoing description provides, and is used to realize the control of bias point.
Fig. 4 is the structured flowchart according to the control device of the bias point of the embodiment of the invention, and is as shown in Figure 4, and this device comprises: first adjusting module 140, comparison module 150 and second adjusting module 160.Wherein, first adjusting module 140 is used to adjust the bias point of RZ modulator of making zero; Comparison module 150 is used for the average light power derivative value that comparison RZ modulators modulate before and after the bias point adjustment is exported light signal; Second adjusting module 160 links to each other with comparison module 150, is used for the bias point according to the comparative result adjustment RZ modulator of comparison module 150, makes the average light power derivative value maximum of the light signal of the current modulation output of RZ modulator.
Pass through the embodiment of the invention; Utilize the bias point of first adjusting module, 140 adjustment RZ modulators; Comparison module 150 is the average light power derivative value of RZ modulators modulate output light signal before and after the bias point adjustment relatively; Second adjusting module 160 is according to the bias point of the comparative result adjustment RZ modulator of comparison module 150; Make that through adjustment the average light power derivative value of light signal of the current modulation of RZ modulator output is maximum, the bias point of the RZ modulator when above-mentioned average light power derivative value is maximum is exactly required bias point, thus this device through DSP realize simple, reliability is high.
In a preferred implementation of the embodiment of the invention, can make that the average light power derivative value of the light signal that the current modulation of RZ modulator is exported is maximum through adjustment.In practical application, the difference before and after the bias point adjustment between the average light power derivative value of RZ modulators modulate output light signal is during less than predetermined value, can think that the average light power derivative value is near maximum.For the average light power derivative value is in course of adjustment constantly near maximum; As shown in Figure 5; Above-mentioned second adjusting module 160 can comprise: judging unit 1602 is used to judge that whether difference between the average light power derivative value of RZ modulators modulate output light signal before and after the bias point adjustment is less than predetermined value; Keep unit 1604, being used in judging unit 1602 results is under the situation that is, keeps the current bias point of said RZ modulator; Adjustment unit 1606, being used in judging unit 1602 results is under the situation not, according to the magnitude relationship of the average light power derivative value of RZ modulators modulate output light signal before and after the bias point adjustment, adjusts RZ modulator bias point.Through this preferred implementation, constantly adjust the bias point of RZ modulator, make the average light power derivative value near maximum, thereby draw the bias point of RZ modulator more accurately.
In view of above-mentioned preferred implementation; Adjustment unit 1606; Magnitude relationship according to the average light power derivative value of RZ modulators modulate output light signal before and after the bias point adjustment; Adjustment RZ modulator bias point can comprise: if adjusted average light power derivative value is less than the preceding average light power derivative value of adjustment, then to adjusting RZ modulator bias point with the direction in the opposite direction of current adjustment; Or, if adjusted average light power derivative value is greater than the preceding average light power derivative value of adjustment, then to the direction adjustment RZ modulator bias point identical with the direction of current adjustment.
According to the embodiment of the invention, a kind of control method of bias point also is provided, can realize through system and/or device that the foregoing description provides.
Fig. 6 is the flow chart according to the control method of the bias point of the embodiment of the invention, and is as shown in Figure 6, and this method may further comprise the steps (step 602-step 606):
The make zero bias point of RZ modulator of step 602, adjustment;
Step 604, relatively the average light power derivative value of RZ modulators modulate output light signal before and after above-mentioned bias point adjustment;
In a preferred implementation of the embodiment of the invention, obtain the average light power derivative value of RZ modulators modulate output light signal, comprising: gather RZ modulators modulate output light signal; To the signal that the collects average light power value of the integration light signal that obtains exporting within a certain period of time; The average light power value is carried out difference processing, obtain the derivative value of average light power.Through this preferred implementation, drawn the average light power derivative value of RZ modulators modulate output light signal, the gained data accuracy is somebody's turn to do, and has improved the accuracy and the reliability of the bias point of adjustment RZ modulator.
Step 606 according to the bias point of comparative result adjustment RZ modulator, makes the average light power derivative value maximum of the light signal of the current modulation output of RZ modulator.
When the average light power derivative value of the light signal of RZ modulators modulate output is maximum, can draw the bias point of RZ modulator.Maximum for the average light power derivative value of the light signal that makes the current modulation of RZ modulator output, can constantly adjust the bias point of RZ modulator according to the average light power derivative value of modulation front and back.In practical application, the difference between the average light power derivative value before and after the adjustment can think that the average light power derivative value of this moment is a maximum, thereby the bias point of this moment is immediate bias point during less than predetermined value.Preferably, above-mentioned predetermined value can be set according to actual needs.
In a preferred implementation of the embodiment of the invention; Bias point according to comparative result adjustment RZ modulator; Make the average light power derivative value maximum of the light signal of the current modulation output of RZ modulator; Can comprise: whether the difference of judgement between the average light power derivative value of RZ modulators modulate output light signal before and after the bias point adjustment be less than predetermined value, if then keep the current bias point of said RZ modulator; Otherwise, according to the magnitude relationship of the average light power derivative value of RZ modulators modulate output light signal before and after the bias point adjustment, adjustment RZ modulator bias point.Through this preferred implementation, constantly adjust the bias point of RZ modulator, improve the accuracy and reliability of bias point.
In a preferred implementation of the embodiment of the invention; Magnitude relationship according to the average light power derivative value of RZ modulators modulate output light signal before and after the bias point adjustment; Adjustment RZ modulator bias point; Can comprise: if adjusted average light power derivative value less than the preceding average light power derivative value of adjustment, then to adjusting RZ modulator bias point with the direction in the opposite direction of current adjustment, is returned step 604; Or if adjusted average light power derivative value greater than the preceding average light power derivative value of adjustment, then to the direction adjustment RZ modulator bias point identical with the direction of current adjustment, is returned step 604.Preferably, when the bias point of adjustment RZ modulator, the step-length of each adjustment is identical.Through this preferred implementation, realized adjustment to bias point, make the average light power derivative value maximum.
Pass through the embodiment of the invention; Average light power derivative value magnitude relationship according to the light signal of the output of the modulation before and after the RZ modulator bias point adjustment; Adjust the bias point of RZ modulator, when the average light power derivative value is maximum, obtain the bias point of required RZ modulator; This method realizes through the digital processing processing unit, has that implementation is simple, accuracy is high and advantage such as high reliability.
Describe through specific embodiment below.
Embodiment two
Fig. 7 is the flow chart according to the control method of the bias point of the embodiment of the invention two, and is as shown in Figure 7, and this method may further comprise the steps (step S):
Step S702, the bias point of initialization RZ modulator calculates the initial average light power derivative value of average light power derivative value conduct that obtains this moment;
Step S704 changes bias point by a fixed step size to a certain direction, and the average light power derivative value of calculating this moment is as new average light power derivative value;
Step S706 judges that whether new average light power derivative value deducts initial light power derivative value less than a certain certain small amount, if the bias point of this moment just can obtain the NRZ signal of 50% stable duty ratio, otherwise, carry out step S708;
Step S708 judges newer average light power derivative value and initial average light power derivative value size.If newly be worth greater than initial value, as initial light power derivative value, with identical step-size change bias point, the average light power derivative value of this moment is as new average light power derivative value to same direction in continuation new average light power derivative value.If new value is less than initial value, round about with identical step-size change bias point, the average light power derivative value of this moment is returned step S706 as new average light power derivative value.
Pass through the embodiment of the invention; The control method that RZ modulator in a kind of RZ-QPSK system of novelty obtains the bias point of 50% duty ratio has been proposed; Through gathering and analyze output light signal average light power; Through judging whether it is that the maximum of its derivative obtains the stable of bias point, this method need not add any pilot signal, and have the Digital Implementation of being beneficial to, cost is low and characteristics such as reliability height.
From above description; Can find out that the present invention has realized following technique effect:, adjust the bias point of RZ modulator according to the average light power derivative value magnitude relationship of the light signal of the output of the modulation before and after the RZ modulator bias point adjustment; If the back average light power derivative value of adjustment is greater than the preceding average light power derivative value of adjustment; Then to the identical direction adjustment RZ modulator bias point of adjustment direction, if the back average light power derivative value of adjustment is less than the average light power derivative value before adjusting, then to adjustment direction adjustment RZ modulator bias point in the opposite direction; And proceed comparison and adjustment; The difference of the average light power derivative value before and after adjustment when this moment, the average light power derivative value was maximum, obtains the bias point of required RZ modulator less than predetermined value; This method realizes through the digital processing processing unit, has that implementation is simple, accuracy is high and advantage such as high reliability.
Obviously, it is apparent to those skilled in the art that above-mentioned each module of the present invention or each step can realize with the general calculation device; They can concentrate on the single calculation element; Perhaps be distributed on the network that a plurality of calculation element forms, alternatively, they can be realized with the executable program code of calculation element; Thereby; Can they be stored in the storage device and carry out, and in some cases, can carry out step shown or that describe with the order that is different from here by calculation element; Perhaps they are made into each integrated circuit modules respectively, perhaps a plurality of modules in them or step are made into the single integrated circuit module and realize.Like this, the present invention is not restricted to any specific hardware and software combination.
The above is merely the preferred embodiments of the present invention, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.All within spirit of the present invention and principle, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. the control method of a bias point is characterized in that, comprising:
The make zero bias point of RZ modulator of steps A, adjustment;
Step B, relatively the average light power derivative value of said RZ modulators modulate output light signal before and after said bias point adjustment;
Step C adjusts the bias point of said RZ modulator according to comparative result, makes the said average light power derivative value of light signal of the current modulation output of said RZ modulator maximum.
2. method according to claim 1 is characterized in that, adjusts the bias point of said RZ modulator according to comparative result, makes the said average light power derivative value of light signal of the current modulation output of said RZ modulator maximum, comprising:
Whether the difference of judgement between the average light power derivative value of said RZ modulators modulate output light signal before and after the said bias point adjustment be less than predetermined value, if then keep the current bias point of said RZ modulator; Otherwise,
According to the magnitude relationship of the average light power derivative value of said RZ modulators modulate output light signal before and after the said bias point adjustment, adjust said RZ modulator bias point.
3. method according to claim 2 is characterized in that, according to the magnitude relationship of the average light power derivative value of said RZ modulators modulate output light signal before and after the said bias point adjustment, adjusts said RZ modulator bias point, comprising:
If adjusted said average light power derivative value then to adjusting said RZ modulator bias point with the direction in the opposite direction of current adjustment, is returned step B less than the preceding said average light power derivative value of adjustment; Or
If adjusted said average light power derivative value is then adjusted said RZ modulator bias point to the direction identical with the direction of current adjustment greater than the preceding said average light power derivative value of adjustment, return step B.
4. according to each described method in the claim 1 to 3, it is characterized in that the derivative value of the said average light power through the following light signal that obtains the output of said RZ modulators modulate:
Gather said RZ modulators modulate output light signal;
To the signal that the collects average light power value of the integration said light signal that obtains exporting within a certain period of time;
Said average light power value is carried out difference processing, obtain the derivative value of said average light power.
5. according to each described method in the claim 1 to 3, it is characterized in that when the bias point of the said RZ modulator of adjustment, the step-length of each adjustment is identical.
6. according to each described method in the claim 1 to 3, it is characterized in that the said bias point of adjustment is to make said RZ modulator obtain the bias point of the NRZ signal of 50% duty ratio.
7. the control device of a bias point is characterized in that, comprising:
First adjusting module is used to adjust the bias point of RZ modulator of making zero;
Comparison module is used for the average light power derivative value that comparison said RZ modulators modulate before and after said bias point adjustment is exported light signal;
Second adjusting module is used for adjusting according to comparative result the bias point of said RZ modulator, makes the said average light power derivative value of light signal of the current modulation output of said RZ modulator maximum.
8. device according to claim 7 is characterized in that, said second adjusting module comprises:
Judging unit is used to judge that whether difference between the average light power derivative value of said RZ modulators modulate output light signal before and after the said bias point adjustment is less than predetermined value;
Keep the unit, being used in said judging unit result is under the situation that is, keeps the current bias point of said RZ modulator;
Adjustment unit, being used in said judging unit result is under the situation not, according to the magnitude relationship of the average light power derivative value of said RZ modulators modulate output light signal before and after the said bias point adjustment, adjusts said RZ modulator bias point.
9. device according to claim 8 is characterized in that, said adjustment unit is adjusted said RZ modulator bias point according to following rule:
If adjusted said average light power derivative value is less than the preceding said average light power derivative value of adjustment, then to adjusting said RZ modulator bias point with the direction in the opposite direction of current adjustment; Or
If adjusted said average light power derivative value is then adjusted said RZ modulator bias point to the direction identical with the direction of current adjustment greater than the preceding said average light power derivative value of adjustment.
10. the control system of a bias point is characterized in that, comprising: optical splitter, first transducer, digital processing unit and second transducer, wherein,
Said optical splitter is used for the RZ modulators modulate output light signal that makes zero is divided into output light signal and light signal fed back;
Said first transducer is used for converting said light signal fed back into the analog feedback signal of telecommunication, and converts the analog feedback electric signal power to the digital feedback electric signal power;
Said digital processing unit comprises each described device among the claim 7-9, is used to handle said first transducer output digital feedback electric signal power and generates the digital feedback control signal;
Said second transducer is used for converting the digital feedback control signal of said digital processing unit output into the analog feedback control signal, is controlled the bias point of said RZ modulator by said analog feedback control signal.
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| CN201110342327.3A CN102394851B (en) | 2011-11-02 | 2011-11-02 | The control method of bias point, apparatus and system |
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| CN102394851B (en) | 2018-02-13 |
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