CN102394851B - The control method of bias point, apparatus and system - Google Patents
The control method of bias point, apparatus and system Download PDFInfo
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- CN102394851B CN102394851B CN201110342327.3A CN201110342327A CN102394851B CN 102394851 B CN102394851 B CN 102394851B CN 201110342327 A CN201110342327 A CN 201110342327A CN 102394851 B CN102394851 B CN 102394851B
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Abstract
The invention discloses a kind of control method of bias point, apparatus and system.Wherein, this method includes：Step A, the bias point of adjustment zero RZ modulators；Step B, compare the average light power derivative value of the RZ modulators modulates output optical signal before and after the adjustment of above-mentioned bias point；Step C, the bias point of RZ modulators is adjusted according to comparative result, RZ modulators is currently modulated the average light power derivative value maximum of the optical signal of output.By realizing that simple, accuracy is high, the control method of the high bias point of reliability the invention provides one kind.
Description
Technical field
The present invention relates to the communications field, in particular to a kind of control method of bias point, apparatus and system.
Background technology
It is more next as the light phase modulation method of representative using QPSK with the raising of optical transmission system speed and the increase of capacity
More paid attention to by industry.QPSK (Quadrature Phase Shift Keying, abbreviation QPSK) modulates skill
Art, information is transmitted with four outs of phase of optical signal, therefore its symbol rate only has the one of traditional light amplitude modulation method
Half, so as to have superior dispersion and polarization mode dispersion performance and higher band efficiency, it is more applicable for Large Copacity, length
The optical transmission system of distance.In order to further improve the OSNR of system (Optical Signal-Noise Ratio, abbreviation
OSNR) performance, industry propose zero QPSK (Return-to-zero QPSK, abbreviation RZ-QPSK) modulation skill
Art, for the system of some high performance systems, such as 100G/s, NRZ is to select well.
, it is necessary to be modulated by lithium niobate modulator in RZ-QPSK modulating systems, as shown in Figure 1.Lithium niobate is modulated
Device is due to the characteristic of own material, its transmission characteristic, and bias point can change with temperature and stress in other words, it is therefore necessary to logical
Certain method is crossed to make the bias point of lithium niobate modulator relatively stable.Currently used control method is in RZ modulators
The pilot signal of multi-frequency is added in modulated signal, is then separated from the modulated signal of output and analyzes these pilot signals
Or the information of its difference frequency signal, the change of pilot signal is fed back, so as to control the stabilization of bias point.Since it is desired that multiple pilot tone letters
Number, therefore control loop is complicated, while pilot signal itself means that the stability of bias point is limited.
RZ-QPSK bias point difference can obtain the zero code signal of different duty.RZ is modulated with dutycycle difference
For 33.3%, 50% and 66.7% three kind of situation.Can be by finding needed for the acquisition of minimum average B configuration luminous power for 33.3%
Highest operating point, required minimum operating point can be obtained by finding maximum average optical power for 66.7%.And for
The bias point of 50% dutycycle will be in the position of pi/2.The stability of this bias point is directly connected to whole RZ-QPSK modulation
The performance of system, thus a low cost, reliable control method have important meaning for RZ-QPSK modulating systems
Justice.
The limited and implementation method for the control stability of the RZ modulator bias points in RZ-QPSK systems in correlation technique
The problem of complicated, effective solution is not yet proposed at present.
The content of the invention
It is limited for the control stability of the RZ modulator bias points in RZ-QPSK systems and implementation method is complicated asks
Topic, the invention provides a kind of control method of bias point, apparatus and system, at least to solve the above problems.
According to an aspect of the invention, there is provided a kind of control method of bias point, including：Step A, adjustment zero RZ
The bias point of modulator；Step B, the average light power for comparing the RZ modulators modulates output optical signal before and after bias point adjustment are led
Numerical value；Step C, the bias point of RZ modulators is adjusted according to comparative result, RZ modulators is currently modulated the optical signal of output
Average light power derivative value is maximum.
Preferably, the bias point of RZ modulators is adjusted according to comparative result, RZ modulators is currently modulated the light letter of output
Number average light power derivative value it is maximum, including：Judge that RZ modulators modulates export the flat of optical signal before and after bias point adjusts
Whether the difference between equal luminous power derivative value is less than predetermined value, if it is, maintaining the current bias point of the RZ modulators；
Otherwise, the magnitude relationship of the average light power derivative value of front and rear RZ modulators modulates output optical signal is adjusted according to bias point, is adjusted
Whole RZ modulators bias point.
Preferably, the big of the average light power derivative value of front and rear RZ modulators modulates output optical signal is adjusted according to bias point
Small relation, RZ modulator bias points are adjusted, including：If the average light power derivative value after adjustment is less than the average light work(before adjustment
Rate derivative value, then adjust RZ modulator bias points, return to step B to the direction in opposite direction currently adjusted；If or adjustment
Average light power derivative value afterwards is more than the average light power derivative value before adjustment, then to the direction identical side with currently adjusting
To adjustment RZ modulator bias points, return to step B.
Preferably, the derivative value of the average light power of the optical signal exported by following acquisition RZ modulators modulates：Collection
RZ modulators modulates export optical signal；Integrate the average light of the optical signal exported within a certain period of time to the signal collected
Performance number；Difference processing is carried out to above-mentioned average optical power value, obtains the derivative value of above-mentioned average light power.
Preferably, when adjusting the bias point of RZ modulators, the step-length adjusted every time is identical.
Preferably, the bias point of adjustment is the bias point for the zero code signal for making RZ modulators 50% dutycycle of acquisition.
According to another aspect of the present invention, there is provided a kind of control device of bias point, including：First adjusting module, use
In the bias point of adjustment zero RZ modulators；Comparison module, exported for comparing the RZ modulators modulates before and after bias point adjustment
The average light power derivative value of optical signal；Second adjusting module, for adjusting the bias point of RZ modulators according to comparative result, make
The average light power derivative value that RZ modulators currently modulate the optical signal of output is maximum.
Preferably, the second adjusting module, including：Judging unit, for judging that RZ modulators are adjusted before and after bias point adjusts
Whether the difference between the average light power derivative value of system output optical signal is less than predetermined value；Maintenance unit, for judging list
In the case that first result is is, the current bias point of RZ modulators is maintained；Adjustment unit, for be no in judging unit result
In the case of, the magnitude relationship that front and rear RZ modulators modulates export the average light power derivative value of optical signal is adjusted according to bias point,
Adjust RZ modulator bias points.
Preferably, adjustment unit is according to following rule adjustment RZ modulator bias points：If the average light power after adjustment is led
Numerical value is less than the average light power derivative value before adjustment, then inclined to RZ modulators are adjusted with the direction in opposite direction currently adjusted
Put a little；Or if the average light power derivative value after adjustment is more than the average light power derivative value before adjustment, adjusted to current
Direction identical direction adjustment RZ modulator bias points.
According to another aspect of the present invention, there is provided a kind of control system of bias point, including：Optical splitter, first turn
Parallel operation, digital processing unit and the second converter, wherein, optical splitter, for zero RZ modulators modulates output optical signal to be divided into
Export optical signal and light signal fed back；First converter, for light signal fed back to be converted into analog feedback electric signal, and will
Analog feedback electric signal power is converted into digital feedback electric signal power；Digital processing unit, the control dress comprising above-mentioned bias point
Put, for handling the first converter output digital feedback electric signal power generation digital feedback control signal；Second converter, use
Analog feedback control signal is converted in the digital feedback control signal for exporting digital processing unit, by analog feedback control signal
Control the bias point of RZ modulators.
By the present invention, the average light power that the optical signal that front and rear modulation exports is adjusted according to RZ modulators bias point is led
Numerical values recited relation, to adjust the bias point of RZ modulators, in average light power derivative value maximum, obtain required RZ modulation
The bias point of device, its implementation is simple, accuracy is high and reliability is high.
Brief description of the drawings
Accompanying drawing described herein is used for providing a further understanding of the present invention, forms the part of the application, this hair
Bright schematic description and description is used to explain the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings：
Fig. 1 is the schematic diagram of RZ modulator structures in the RZ-QPSK systems according to correlation technique；
Fig. 2 is the schematic diagram of the control system of bias point according to embodiments of the present invention；
Fig. 3 is the schematic diagram of the control system of according to embodiments of the present invention one bias point；
Fig. 4 is the structured flowchart of the control device of bias point according to embodiments of the present invention；
Fig. 5 is the preferable structured flowchart of control device of bias point according to embodiments of the present invention；
Fig. 6 is the flow chart of the control method of bias point according to embodiments of the present invention；
Fig. 7 is the flow chart of the control method of according to embodiments of the present invention two bias point.
Embodiment
Describe the present invention in detail below with reference to accompanying drawing and in conjunction with the embodiments.It should be noted that do not conflicting
In the case of, the feature in embodiment and embodiment in the application can be mutually combined.
For obtaining the zero code signal that dutycycle is 50%, under RZ-QPSK modulation systems, the bias point of RZ modulators
Need to be placed on pi/2, drive amplitude is generally Vπ。
If drive signal is：
Then average light power is：
WhereinFor bias point relative toDeviation.
It is after formula (2) expansion：
It can be seen that average light power and bias point relative toThe deviation of point is into SIN function relation.Sampling is averaged
Luminous power carry out difference processing, can obtain (3) formula onDerivative：
If formula (4) obtains maximum, that is, obtain the bias point of required RZ modulators.
According to embodiments of the present invention, there is provided a kind of control system of bias point, the system are based on above-mentioned analysis, i.e. RZ is adjusted
The bias point of required RZ modulators is can obtain during the average light power derivative value maximum of device modulation output optical signal processed.
Fig. 2 is the schematic diagram of the control system of bias point according to embodiments of the present invention, as shown in Fig. 2 the system includes：
Optical splitter 10, the first converter 20, the converter 40 of digital processing unit 30 and second.Wherein, optical splitter 10, for zero RZ to be adjusted
Device modulation output optical signal processed is divided into output optical signal and light signal fed back；First converter 20, couples with optical splitter 10, is used for
The light signal fed back that optical splitter 10 exports is converted into analog feedback electric signal, and feedback electric signal power is converted into numeral
Feed back electric signal power；Digital processing unit 30, coupled with the first converter 20, for handling the first converter 20 conversion gained
Digital feedback electric signal power generates digital feedback control signal, adjusts the bias point of RZ modulators so that feedback electric signal work(
The derivative value of rate is maximum；Second converter 40, is coupled with digital processing unit 30, and the numeral for digital processing unit 30 to be exported is anti-
Feedforward control signal is converted into analog feedback control signal, and the bias point of RZ modulators is controlled by the analog feedback control signal.
By the embodiment of the present invention, RZ modulators modulates output optical signal is divided into two beams, Yi Shuwei using optical splitter 10
Optical signal is exported, a branch of is light signal fed back, and light signal fed back is converted into feeding back electric signal after the first converter 20, further
Digital feedback electric signal power is converted into by electric signal power is fed back by the first converter 20, by 30 above-mentioned numeral of digital processing unit
Feedback signal power simultaneously generates digital feedback control signal, and digital feedback control signal is converted into simulation instead by the second converter 40
Feedforward control signal, the bias point of RZ modulators is adjusted by the analog feedback control signal so that feed back the derivative of electric signal power
Value is maximum, you can obtains stable RZ modulator bias points.The system does not need additional any pilot signal, utilizes digital processing
Device is realized so that realizes that simple, cost is low and reliability is high.
It is described below by specific embodiment.
Embodiment one
Fig. 3 is the schematic diagram of the control system of according to embodiments of the present invention one bias point, as shown in figure 3, the system bag
Include：Laser 50, QPSK units 60, clock 70, RZ modulators 80, coupler 90 (equivalent to the optical splitter 10 in Fig. 2), high speed
PIN pipes 100 (equivalent to the first converter 20 in Fig. 2), analog-digital converter AD 110 are (equivalent to the first converter in Fig. 2
20), digital signal processing chip DSP 120, digital-to-analogue conversion DA 130 (equivalent to the second converter 40 in Fig. 2).
The optical signal E sent from laser 40inThe phase modulated signal of non-return-to-zero is exported by a QPSK unit 60
ENRZ.Then ENRZSignal is by the RZ modulators E after 80s for exporting NRZRZSignal, this signal are defeated through 5/95 coupler 90 again
Go outWithWherein 95% output lightModulate and export for final RZ-QPSK, and 5% output lightManaged through high speed PIN
100 carry out opto-electronic conversion, and the power collecting then is entered into digital signal processing chip DSP 120, DSP using high-precision AD 110
120 adjustment bias point feedback control signals are converted to the bias point of analog voltage signal control RZ modulators 80 through DA 130, make
Mean power derivative maximum must be eventually detected to obtain, you can realize the correct bias for obtaining 50% dutycycle.
It is the Bias point control system of the RZ modulators of embodiment by the present invention, at average power detection and numeral
Reason is realized.Compared with other systems, such as：Using the system of the temperature change of thermistor feedback RZ modulators, have high-precision
Degree, high reliability, high-responsivity and control loop are flexibly simple, beneficial to debugging the advantages that.The system of the RZ-QPSK modulators
The locking to the bias point of 50% dutycycle can quickly, stably, be accurately realized, while is not only restricted to PD bands built in modulator
Width, the transmission to 100G dense wavelength division systems have great importance.
According to embodiments of the present invention, a kind of control device of bias point is additionally provided, the device can be located at above-mentioned implementation
The digital processing unit (i.e. the DSP 110 in digital processing element 30 or Fig. 3 in Fig. 2) of the control system for the bias point that example provides
In, for realizing the control of bias point.
Fig. 4 is the structured flowchart of the control device of bias point according to embodiments of the present invention, as shown in figure 4, the device bag
Include：First adjusting module 140, the adjusting module 160 of comparison module 150 and second.Wherein, the first adjusting module 140, for adjusting
The bias point of zero RZ modulators；Comparison module 150, believe for comparing the RZ modulators modulates output light before and after bias point adjustment
Number average light power derivative value；Second adjusting module 160, is connected with comparison module 150, for according to comparison module 150
Comparative result adjusts the bias point of RZ modulators, RZ modulators is currently modulated the average light power derivative value of the optical signal of output
It is maximum.
By the embodiment of the present invention, the bias point of the first adjusting module 140 adjustment RZ modulators, comparison module 150 are utilized
Compare the average light power derivative value of the RZ modulators modulates output optical signal before and after bias point adjustment, the second adjusting module 160
The bias point of RZ modulators is adjusted according to the comparative result of comparison module 150, is currently modulated by adjustment RZ modulators defeated
The average light power derivative value of the optical signal gone out is maximum, the bias point of RZ modulators during above-mentioned average light power derivative value maximum
It is exactly required bias point, the device is realized by DSP so as to realize that simple, reliability is high.
In a preferred embodiment of the embodiment of the present invention, can currently it be modulated by adjustment RZ modulators defeated
The average light power derivative value of the optical signal gone out is maximum.In actual applications, RZ modulators modulates export before and after bias point adjustment
When difference between the average light power derivative value of optical signal is less than predetermined value, it is believed that average light power derivative value approaches
Maximum.In order that average light power derivative value is in course of adjustment constantly close to maximum, as shown in figure 5, above-mentioned second adjusts
Mould preparation block 160 can include：Judging unit 1602, for judging the RZ modulators modulates output optical signal before and after bias point adjusts
Average light power derivative value between difference whether be less than predetermined value；Maintenance unit 1604, in the knot of judging unit 1602
In the case that fruit is is, the current bias point of the RZ modulators is maintained；Adjustment unit 1606, in the knot of judging unit 1602
Fruit in the case of no, according to bias point adjust front and rear RZ modulators modulates export optical signal average light power derivative value it is big
Small relation, adjust RZ modulator bias points.Pass through the bias point of this preferred embodiment, constantly adjustment RZ modulators so that flat
Equal luminous power derivative value is close to maximum, so as to more accurately draw the bias point of RZ modulators.
In view of above-mentioned preferred embodiment, adjustment unit 1606, adjusts front and rear RZ modulators modulates according to bias point and exports
The magnitude relationship of the average light power derivative value of optical signal, adjustment RZ modulators bias point can include：If being averaged after adjustment
Luminous power derivative value is less than the average light power derivative value before adjustment, then adjusts RZ to the direction in opposite direction currently adjusted
Modulator bias point；If or, adjustment after average light power derivative value be more than adjustment before average light power derivative value, to
The direction identical direction adjustment RZ modulator bias points currently adjusted.
According to embodiments of the present invention, a kind of control method of bias point is additionally provided, can be provided by above-described embodiment
System and/or device realize.
Fig. 6 is the flow chart of the control method of bias point according to embodiments of the present invention, as shown in fig. 6, this method includes
Following steps (step 602- steps 606)：
Step 602, the bias point of adjustment zero RZ modulators；
Step 604, the average light power for comparing the RZ modulators modulates output optical signal before and after the adjustment of above-mentioned bias point is led
Numerical value；
In a preferred embodiment of the embodiment of the present invention, the average light of RZ modulators modulates output optical signal is obtained
Power derivative value, including：Gather RZ modulators modulates output optical signal；The signal collected is integrated to obtain within a certain period of time
The average optical power value of the optical signal of output；Difference processing is carried out to average optical power value, obtains the derivative value of average light power.
By this preferred embodiment, the average light power derivative value of RZ modulators modulates output optical signal, the data obtained essence have been drawn
Exactness is somebody's turn to do, and improves the degree of accuracy and the reliability of the bias point of adjustment RZ modulators.
Step 606, the bias point of RZ modulators is adjusted according to comparative result, RZ modulators is currently modulated the light letter of output
Number average light power derivative value it is maximum.
In the average light power derivative value maximum of the optical signal of RZ modulators modulates output, it can be deduced that RZ modulators
Bias point.In order that the average light power derivative value that RZ modulators currently modulate the optical signal of output is maximum, can continuous basis
Front and rear average light power derivative value is modulated to adjust the bias point of RZ modulators.In actual applications, put down when adjustment is front and rear
When difference between equal luminous power derivative value is less than predetermined value, it is believed that average light power derivative value now is maximum,
So as to which bias point now is immediate bias point.Preferably, above-mentioned predetermined value can be set according to being actually needed.
In a preferred embodiment of the embodiment of the present invention, the bias point of RZ modulators is adjusted according to comparative result,
RZ modulators is currently modulated the average light power derivative value maximum of the optical signal of output, can include：Judge to adjust in bias point
Whether the difference between the average light power derivative value of whole front and rear RZ modulators modulates output optical signal is less than predetermined value, if
It is the bias point for then maintaining the RZ modulators current；Otherwise, front and rear RZ modulators modulates output light is adjusted according to bias point to believe
Number average light power derivative value magnitude relationship, adjust RZ modulator bias points.Pass through this preferred embodiment, constantly adjustment
The bias point of RZ modulators, improve the accuracy and reliability of bias point.
In a preferred embodiment of the embodiment of the present invention, front and rear RZ modulators modulates are adjusted according to bias point and exported
The magnitude relationship of the average light power derivative value of optical signal, RZ modulator bias points are adjusted, can be included：If being averaged after adjustment
Luminous power derivative value is less than the average light power derivative value before adjustment, then adjusts RZ to the direction in opposite direction currently adjusted
Modulator bias point, return to step 604；Or if the average light power that the average light power derivative value after adjustment is more than before adjustment is led
Numerical value, then adjust RZ modulator bias points, return to step 604 to the direction identical direction currently adjusted.Preferably, adjusting
During the bias point of whole RZ modulators, the step-length adjusted every time is identical.By this preferred embodiment, the tune to bias point is realized
It is whole so that average light power derivative value is maximum.
By the embodiment of the present invention, the front and rear average light for modulating the optical signal exported is adjusted according to RZ modulators bias point
Power derivative value magnitude relationship, to adjust the bias point of RZ modulators, in average light power derivative value maximum, obtain required
The bias point of RZ modulators, this method realized by digital processing processing unit, has that implementation is simple, accuracy is high and high
The advantages that reliability.
It is described below by specific embodiment.
Embodiment two
Fig. 7 is the flow chart of the control method of according to embodiments of the present invention two bias point, as shown in fig. 7, this method bag
Include following steps (step S)：
Step S702, the bias point of RZ modulators is initialized, calculate the average light power derivative value obtained now and be used as just
Beginning average light power derivative value；
Step S704, change bias point to a direction by a fixed step size, the average light power derivative value calculated now is made
For new average light power derivative value；
Step S706, judge that whether new average light power derivative value subtracts initial light power derivative value less than a certain specific
In a small amount, if so, bias point now just can obtain the zero code signal of 50% dutycycle stably, otherwise, progress step S708；
Step S708, judge newer average light power derivative value and initial average light power derivative value size.If
New value is more than initial value, using new average light power derivative value as initial light power derivative value, continues to same direction with phase
With step-size change bias point, average light power derivative value now is as new average light power derivative value.If new value is small
In initial value, round about with identical step-size change bias point, average light power derivative value now is as new average light
Power derivative value, return to step S706.
Pass through the embodiment of the present invention, it is proposed that RZ modulators obtain 50% dutycycle in a kind of novel RZ-QPSK systems
Bias point control method, by gathering and analyzing output light signal averaging luminous power, by judging whether it is its derivative
Maximum obtains the stabilization of bias point, and this method does not need additional any pilot signal, and with beneficial to Digital Implementation, into
The features such as this low and reliability is high.
As can be seen from the above description, the present invention realizes following technique effect：Adjusted according to RZ modulators bias point
The average light power derivative value magnitude relationship of the optical signal of whole front and rear modulation output, to adjust the bias point of RZ modulators, if
The rear average light power derivative value of adjustment is more than the average light power derivative value before adjustment, then is adjusted to adjustment direction identical direction
Whole RZ modulators bias point, if the rear average light power derivative value of adjustment is less than the average light power derivative value before adjustment, to
The opposite direction adjustment RZ modulator bias points of adjustment direction, and continue to compare and adjust, until adjusting front and rear be averaged
The difference of luminous power derivative value is less than predetermined value, now during average light power derivative value maximum, obtains the inclined of required RZ modulators
Put a little, this method is realized by digital processing processing unit, has that implementation is simple, accuracy is high and high reliability etc. is excellent
Point.
Obviously, those skilled in the art should be understood that above-mentioned each module of the invention or each step can be with general
Computing device realize that they can be concentrated on single computing device, or be distributed in multiple computing devices and formed
Network on, alternatively, they can be realized with the program code that computing device can perform, it is thus possible to they are stored
Performed in the storage device by computing device, and in some cases, can be with different from shown in order execution herein
The step of going out or describing, they are either fabricated to each integrated circuit modules respectively or by multiple modules in them or
Step is fabricated to single integrated circuit module to realize.So, the present invention is not restricted to any specific hardware and software combination.
The preferred embodiments of the present invention are the foregoing is only, are not intended to limit the invention, for the skill of this area
For art personnel, the present invention can have various modifications and variations.Within the spirit and principles of the invention, that is made any repaiies
Change, equivalent substitution, improvement etc., should be included in the scope of the protection.
Claims (7)
- A kind of 1. control method of bias point, it is characterised in that including：Step A, the bias point of adjustment zero RZ modulators；Step B, compare the average light power derivative of the RZ modulators modulates output optical signal before and after bias point adjustment Value, wherein, obtain the average light power derivative value by following：Gather the RZ modulators modulates output optical signal；To adopting The signal collected integrates the average optical power value of the optical signal exported within a certain period of time；To the average light power Value carries out difference processing, obtains the derivative value of the average light power；Step C, the bias point of the RZ modulators is adjusted according to comparative result, the RZ modulators is currently modulated the light of output The average light power derivative value of signal is maximum；Wherein, the bias point of the RZ modulators is adjusted according to comparative result, the RZ modulators is currently modulated the light of output The average light power derivative value of signal is maximum, including：Judge the RZ modulators modulates before and after the bias point adjusts Whether the difference exported between the average light power derivative value of optical signal is less than predetermined value, if it is, maintaining the RZ to modulate The current bias point of device；Otherwise, the RZ modulators modulates export the average light of optical signal before and after being adjusted according to the bias point The magnitude relationship of power derivative value, adjust the RZ modulators bias point.
- 2. according to the method for claim 1, it is characterised in that the RZ modulators are adjusted before and after being adjusted according to the bias point The magnitude relationship of the average light power derivative value of system output optical signal, adjusts the RZ modulators bias point, including：If adjustment after the average light power derivative value be less than adjustment before the average light power derivative value, to it is current The direction in opposite direction of adjustment adjusts the RZ modulators bias point, return to step B；OrIf adjustment after the average light power derivative value be more than adjustment before the average light power derivative value, to it is current The direction identical direction of adjustment adjusts the RZ modulators bias point, return to step B.
- 3. method according to claim 1 or 2, it is characterised in that when adjusting the bias point of the RZ modulators, every time The step-length of adjustment is identical.
- 4. method according to claim 1 or 2, it is characterised in that the bias point of adjustment is to make the RZ modulators Obtain the bias point of the zero code signal of 50% dutycycle.
- A kind of 5. control device of bias point, it is characterised in that including：First adjusting module, for adjusting the bias point of zero RZ modulators；Comparison module, for comparing the average light work(of the RZ modulators modulates output optical signal before and after bias point adjustment Rate derivative value；Second adjusting module, for adjusting the bias point of the RZ modulators according to comparative result, make the RZ modulators current The average light power derivative value for modulating the optical signal of output is maximum；Wherein, second adjusting module, including：Judging unit, for judging that the RZ is adjusted before and after the bias point adjusts Whether the difference between the average light power derivative value of device modulation output optical signal processed is less than predetermined value；Maintenance unit, for In the case that the judging unit result is is, the current bias point of the RZ modulators is maintained；Adjustment unit, for described In the case that judging unit result is no, the RZ modulators modulates export the flat of optical signal before and after being adjusted according to the bias point The magnitude relationship of equal luminous power derivative value, adjusts the RZ modulators bias point.
- 6. device according to claim 5, it is characterised in that the adjustment unit is adjusted according to RZ described in following rule adjustment Device bias point processed：If adjustment after the average light power derivative value be less than adjustment before the average light power derivative value, to it is current The direction in opposite direction of adjustment adjusts the RZ modulators bias point；OrIf adjustment after the average light power derivative value be more than adjustment before the average light power derivative value, to it is current The direction identical direction of adjustment adjusts the RZ modulators bias point.
- A kind of 7. control system of bias point, it is characterised in that including：Optical splitter, the first converter, digital processing unit and second Converter, wherein,The optical splitter, for zero RZ modulators modulates output optical signal to be divided into output optical signal and light signal fed back；First converter, for the light signal fed back to be converted into analog feedback electric signal, and analog feedback is electric Signal power is converted into digital feedback electric signal power；The digital processing unit, comprising the device described in claim 5 or 6, for handling the first converter output numeral Feed back electric signal power generation digital feedback control signal；Second converter, the digital feedback control signal for the digital processing unit to be exported are converted to analog feedback control Signal processed, the bias point of the RZ modulators is controlled by the analog feedback control signal.
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