CN101969340B - Adaptive compensation method for inhibiting bias point drift of Mach-Zehnder modulator - Google Patents
Adaptive compensation method for inhibiting bias point drift of Mach-Zehnder modulator Download PDFInfo
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- CN101969340B CN101969340B CN2010105290549A CN201010529054A CN101969340B CN 101969340 B CN101969340 B CN 101969340B CN 2010105290549 A CN2010105290549 A CN 2010105290549A CN 201010529054 A CN201010529054 A CN 201010529054A CN 101969340 B CN101969340 B CN 101969340B
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Abstract
The invention relates to an adaptive compensation method for inhibiting bias point drift of a Mach-Zehnder modulator. The method comprises the following steps of: adopting a thermal resistor to detect the environment temperature at a waveguide part of the Mach-Zehnder modulator; inputting a resistance value of the thermal resistor into a bias point control circuit of the Mach-Zehnder modulator, wherein the output quantity of the bias point control circuit of the Mach-Zehnder modulator is the bias voltage of the Mach-Zehnder modulator; establishing an expression about the environment temperature at the waveguide part of the Mach-Zehnder modulator of the bias voltage; and realizing the adaptive compensation that a bias point of the Mach-Zehnder modulator drifts along with the changes of theenvironment temperature by using the expression. The adaptive compensation method obtains a drift coefficient about environment temperature variable of the bias point of the Mach-Zehnder modulator bymeasuring the drift quantity of the bias point of the Mach-Zehnder modulator along with the changes of the environment temperature, and inputs the drift coefficient into the bias point control circuit of the Mach-Zehnder modulator to ensure that the bias voltage output by the control circuit changes along with the changes of the environment temperature.
Description
Technical field
The present invention relates to the Mach zehnder modulators of the transmitting terminal in the fiber optic transmission system, is a kind of Mach self-adapting compensation method of zehnder modulators bias point drift that suppresses specifically.
Background technology
In the high speed fibre transmission system, transmitting terminal is made of distributed feedback laser, Mach zehnder modulators, radiofrequency signal input circuit and Mach zehnder modulators bias point control circuit, realize intensity and phase place modulation by Mach zehnder modulators bias point is set, realize multistage amplitude-phase modulation by the cascading Mach zehnder modulators.
Mach zehnder modulators bias point can drift about with the variation of ambient temperature, and the drift of bias point will influence amplitude and the phase place of transmitting terminal output signal, be necessary to take measures to stablize the bias point of Mach zehnder modulators.Prior art is taked semiconductor cooler TEC (ThermoelectricCooler) control waveguide local temperature, is specifically to feed back to temperature control behind the TEC by the thermistor detecting temperature.Because the tuning temperature of TEC is a kind of homeostasis process, the waveguide local temperature can experience near the temperature value the target set-point in tuning process, causes the bias point experience of Mach zehnder modulators than great fluctuation process, the output performance of influence Mach zehnder modulators.
Summary of the invention
At the defective that exists in the prior art, the object of the present invention is to provide a kind of Mach self-adapting compensation method of zehnder modulators bias point drift that suppresses, by measuring Mach zehnder modulators bias point with the drift value of variation of ambient temperature, obtain Mach zehnder modulators bias point about the coefficient of deviation of ambient temperature variable, with the control circuit of coefficient of deviation input Mach zehnder modulators bias point, the bias voltage that makes control circuit output changes with the variation of ambient temperature.
For reaching above purpose, the technical scheme that the present invention takes is:
A kind of Mach self-adapting compensation method of zehnder modulators bias point drift that suppresses, it is characterized in that: at the transmitting terminal of high speed fibre transmission system, adopt thermistor to survey the ambient temperature of Mach zehnder modulators waveguide place, the resistance of described thermistor changes with the variation of ambient temperature of Mach zehnder modulators waveguide place
The resistance of thermistor is imported Mach zehnder modulators bias point control circuit as monitoring variable, and then the ambient temperature of Mach zehnder modulators waveguide place is Mach input variable of zehnder modulators bias point control circuit,
The output variable of Mach zehnder modulators bias point control circuit is the bias voltage of Mach zehnder modulators,
Set up the corresponding relation between Mach zehnder modulators bias point control circuit output variable and the input variable, this corresponding relation be bias voltage about the expression formula of Mach zehnder modulators waveguide place ambient temperature, utilize this expression formula to realize the adaptive equalization that Mach zehnder modulators bias point drifts about with variation of ambient temperature.
On the basis of technique scheme, comprise at the transmitting terminal of high speed fibre transmission system: distributed feedback laser 101, Mach zehnder modulators 102 and bias point control circuit 103;
The input variable of bias point control circuit 103 is resistance R of Mach zehnder modulators 102 waveguide place thermistors
t, output variable is the bias voltage V of Mach zehnder modulators 102
Bias
Bias point control circuit 103 output offset voltage V
BiasTo the electrode of Mach zehnder modulators 102, be used for changing the bias point of Mach zehnder modulators 102.
On the basis of technique scheme, the internal structure of described Mach zehnder modulators 102 comprises: the first lithium niobate waveguide 12, the second lithium niobate waveguide 13, electrode 11 and thermistor 14;
The resistance R of Mach zehnder modulators 102 waveguide place thermistors 14
tExport bias point control circuit 103 to, with the resistance R of thermistor 14
tVariation reflect the variation of Mach zehnder modulators 102 waveguide place ambient temperatures;
Along with the variation of Mach zehnder modulators 102 waveguide place ambient temperatures, the bias point of Mach zehnder modulators 102 will drift about, the resistance R of the thermistor of waveguide place simultaneously 14
tAlso change thereupon;
Measure Mach zehnder modulators 102 bias point drift values with the coefficient of deviation of variation of ambient temperature, according to coefficient of deviation bias point control circuit 103 is arranged, make the bias voltage V of bias point control circuit 103 outputs
BiasVariation with ambient temperature changes, and realizes the adaptive equalization of Mach zehnder modulators bias point drift.
On the basis of technique scheme, the length of establishing the first lithium niobate waveguide of Mach zehnder modulators 102 is d
1, the length of the second lithium niobate waveguide is d
2, and d
1=d
2+ Δ d;
The ambient temperature of the first lithium niobate waveguide and second lithium niobate waveguide waveguide place is t, and the t value is by the resistance R of Mach zehnder modulators 102 waveguide place thermistors
tEmbody, represent the variable quantity of waveguide place ambient temperature with t-25;
The phase difference of the light wave that transmits in the first lithium niobate waveguide and the second lithium niobate waveguide then
Be expressed as
(3) in the formula,
Be near the phase place of the light wave that transmits the 1550nm wavelength in the lithium niobate waveguide variation coefficient about waveguide length and two variablees of ambient temperature,
Then: the phase difference of the light wave that transmits in the first lithium niobate waveguide and the second lithium niobate waveguide
Variation with waveguide place ambient temperature t changes, and variation coefficient is
Variation coefficient k is that Mach zehnder modulators 102 bias points are about the coefficient of deviation of ambient temperature variable t;
Thermistor is surveyed the ambient temperature variable t of Mach zehnder modulators 102 waveguides place, exports bias point control circuit 103 to, makes the bias voltage V of bias point control circuit 103 outputs
BiasSatisfy the adaptive equalization that expression formula (4) can realize the drift of Mach zehnder modulators 102 bias points:
(4) in the formula, V
0Expression Mach zehnder modulators 102 waveguide place ambient temperatures are 25 bias voltages when spending, V
πThe half-wave voltage of expression Mach zehnder modulators 102.
On the basis of technique scheme, the half-wave voltage V of known Mach zehnder modulators 102
π, by the bias voltage V of the following Mach zehnder modulators 102 of test varying environment temperature t condition
Bias, the process linear fit obtains the V of (4) formula
0With coefficient of deviation k.
The self-adapting compensation method that suppresses the drift of Mach zehnder modulators bias point of the present invention, by measuring Mach zehnder modulators bias point with the drift value of variation of ambient temperature, obtain Mach zehnder modulators bias point about the coefficient of deviation of ambient temperature variable, with the control circuit of coefficient of deviation input Mach zehnder modulators bias point, the bias voltage that makes control circuit output changes with the variation of ambient temperature.
Description of drawings
The present invention has following accompanying drawing:
The transmitting terminal block diagram that Fig. 1 the present invention adopts,
The cut-away view of the Mach zehnder modulators that Fig. 2 the present invention adopts.
Embodiment
Below in conjunction with accompanying drawing the present invention is described in further detail.
The technical solution used in the present invention is: find out the rule of bias voltage drift earlier, then output offset voltage is arranged temperature correlation coefficient, do not control the local temperature of waveguide.
The self-adapting compensation method that suppresses the drift of Mach zehnder modulators bias point of the present invention, transmitting terminal in the high speed fibre transmission system, adopt thermistor to survey the ambient temperature of Mach zehnder modulators waveguide place, the resistance of described thermistor changes with the variation of ambient temperature of Mach zehnder modulators waveguide place, the resistance of thermistor is imported Mach zehnder modulators bias point control circuit as monitoring variable, then the ambient temperature of Mach zehnder modulators waveguide place is Mach input variable of zehnder modulators bias point control circuit, and the output variable of Mach zehnder modulators bias point control circuit is the bias voltage of Mach zehnder modulators, set up the corresponding relation between Mach zehnder modulators bias point control circuit output variable and the input variable, this corresponding relation be bias voltage about the expression formula of Mach zehnder modulators waveguide place ambient temperature, utilize this expression formula to realize the adaptive equalization that Mach zehnder modulators bias point drifts about with variation of ambient temperature.
The transmitting terminal that the present invention adopts comprises as shown in Figure 1: distributed feedback laser 101, Mach zehnder modulators 102 and bias point control circuit 103.The input variable of bias point control circuit 103 is resistance R of Mach zehnder modulators 102 waveguide place thermistors
t, output variable is the bias voltage V of Mach zehnder modulators 102
BiasBias point control circuit 103 output offset voltage V
BiasTo the electrode of Mach zehnder modulators 102, be used for changing the bias point of Mach zehnder modulators 102.
The internal structure of the Mach zehnder modulators 102 that the present invention adopts as shown in Figure 2, comprise: the first lithium niobate waveguide 12, the second lithium niobate waveguide 13, electrode 11 and thermistor 14, electrode 11 tops are the first lithium niobate waveguide 12, the below is the second lithium niobate waveguide 13, and thermistor 14 is located at the second lithium niobate waveguide, 13 belows.The resistance R of Mach zehnder modulators 102 waveguide place thermistors 14
tExport bias point control circuit 103 to, with the resistance R of thermistor 14
tVariation reflect the variation of Mach zehnder modulators 102 waveguide place ambient temperatures; Along with the variation of Mach zehnder modulators 102 waveguide place ambient temperatures, the bias point of Mach zehnder modulators 102 will drift about, the resistance R of the thermistor of waveguide place simultaneously 14
tAlso change thereupon; Measure Mach zehnder modulators 102 bias point drift values with the coefficient of deviation of variation of ambient temperature, according to coefficient of deviation bias point control circuit 103 is arranged, make the bias voltage V of bias point control circuit 103 outputs
BiasVariation with ambient temperature changes, and realizes the adaptive equalization of Mach zehnder modulators bias point drift.
Concrete material parameter below in conjunction with Mach zehnder modulators 102 makes an explanation to the adaptive equalization process that Mach zehnder modulators bias point drifts about.
The coefficient of linear expansion d of the lithium niobate waveguide of Mach zehnder modulators 102
t=2 * 10
-6, refractive index n about the expression formula of wavelength X and temperature T is:
(1) formula is quoted from photoelectron laser alignment three volume fourth phase articles " PPLN overtones band and temperature relation analysis ".(1) in the formula, the unit of wavelength X is nm, temperature T=t+273, and the unit of t is ℃.A=4.913, B=0, C=1.173 * 10
5, D=1.65 * 10
-2, E=2.12 * 10
2, F=2.7 * 10
-5, G=-2.78 * 10
-8, it is n that above-mentioned parameter substitution (1) formula can be got near the thermo-optical coeffecient of the lithium niobate waveguide 1550nm wavelength
t=1 * 10
-6
When the ambient temperature of lithium niobate waveguide place changes, at coefficient of linear expansion d
tWith thermo-optical coeffecient n
tEffect under length d and the refractive index n of lithium niobate waveguide change, namely light path nd changes, and makes nd/ that λ remains unchanged, central wavelength lambda will vary with temperature and drift about this moment, coefficient of deviation is-0.46GHz/ ℃.Near the phase place of the light wave that transmits the 1550nm wavelength in the lithium niobate waveguide is about the variation coefficient of waveguide length and two variablees of ambient temperature
Expression formula be:
(2) in the formula, n represents the refractive index value at 1550nm wavelength place, value 2.2; C represents the light velocity in the vacuum.By (2) Shi Kede
If the length of the first lithium niobate waveguide of Mach zehnder modulators 102 is d
1, the length of the second lithium niobate waveguide is d
2, and d
1=d
2+ Δ d; The ambient temperature of the first lithium niobate waveguide and second lithium niobate waveguide waveguide place is t, and the t value is by the resistance R of Mach zehnder modulators 102 waveguide place thermistors
tEmbody, represent the variable quantity of waveguide place ambient temperature with t-25; The phase difference of the light wave that transmits in the first lithium niobate waveguide and the second lithium niobate waveguide then
Be expressed as
(3) in the formula,
Be near the phase place of the light wave that transmits the 1550nm wavelength in the lithium niobate waveguide variation coefficient about waveguide length and two variablees of ambient temperature, from (3) formula as can be seen, the phase difference of the light wave that transmits in the first lithium niobate waveguide and the second lithium niobate waveguide
Variation with waveguide place ambient temperature t changes, and variation coefficient is
Variation coefficient k is that Mach zehnder modulators 102 bias points are about the coefficient of deviation of ambient temperature variable t.Thermistor is surveyed the ambient temperature variable t of Mach zehnder modulators 102 waveguides place, exports bias point control circuit 103 to, makes the bias voltage V of bias point control circuit 103 outputs
BiasSatisfy the adaptive equalization that expression formula (4) can realize the drift of Mach zehnder modulators 102 bias points.
(4) in the formula, V
0Expression Mach zehnder modulators 102 waveguide place ambient temperatures are 25 bias voltages when spending, V
πThe half-wave voltage of expression Mach zehnder modulators 102.
The half-wave voltage V of known Mach zehnder modulators 102
π, by the bias voltage V of the following Mach zehnder modulators 102 of test varying environment temperature t condition
Bias, the process linear fit can obtain the V of (4) formula
0With coefficient of deviation k.Bias point control circuit 103 is according to (4) formula output offset voltage V
BiasTo the electrode of Mach zehnder modulators 102, ambient temperature t is changed the bias point drift that causes carry out adaptive equalization.
Multistage amplitude-phase modulator is that structure with Mach shown in Figure 2 zehnder modulators 102 is base configuration, and the self-adapting compensation method of the bias point drift of the present invention's statement is equally applicable to multistage amplitude-phase modulator.
Claims (3)
1. one kind is suppressed Mach self-adapting compensation method of zehnder modulators bias point drift, it is characterized in that: at the transmitting terminal of high speed fibre transmission system, adopt thermistor to survey the ambient temperature t of Mach zehnder modulators waveguide place, the resistance of described thermistor changes with the variation of ambient temperature of Mach zehnder modulators waveguide place
The resistance of thermistor is imported Mach zehnder modulators bias point control circuit as monitoring variable, and then the ambient temperature t of Mach zehnder modulators waveguide place is Mach input variable of zehnder modulators bias point control circuit,
The output variable of Mach zehnder modulators bias point control circuit is the bias voltage V of Mach zehnder modulators
Bias,
Set up the corresponding relation between Mach zehnder modulators bias point control circuit output variable and the input variable
This corresponding relation is that bias voltage is about the expression formula of Mach zehnder modulators waveguide place ambient temperature, wherein: V
0Expression Mach zehnder modulators waveguide place ambient temperature is 25 bias voltages when spending, V
πThe half-wave voltage of expression Mach zehnder modulators, k be Mach zehnder modulators bias point about the coefficient of deviation of ambient temperature variable t, (t-25) variable quantity of expression waveguide place ambient temperature utilizes the half-wave voltage V of known Mach zehnder modulators
π, by the bias voltage V of the following Mach zehnder modulators of test varying environment temperature t condition
Bias, obtain V through linear fit
0With coefficient of deviation k;
According to the actual environment temperature t of current Mach zehnder modulators waveguide place, utilize
Obtain the current bias voltage V of Mach zehnder modulators
BiasThereby, realize the adaptive equalization that Mach zehnder modulators bias point drifts about with variation of ambient temperature.
2. a self-adapting compensation method that suppresses the drift of Mach zehnder modulators bias point as claimed in claim 1, it is characterized in that, comprise at the transmitting terminal of high speed fibre transmission system: distributed feedback laser (101), Mach zehnder modulators (102) and bias point control circuit (103);
The input variable of bias point control circuit (103) is the resistance R of a Mach zehnder modulators (102) waveguide place thermistor
t, output variable is the bias voltage V of a Mach zehnder modulators (102)
Bias
Bias point control circuit (103) output offset voltage V
BiasTo the electrode of Mach zehnder modulators (102), be used for changing the bias point of Mach zehnder modulators (102).
3. a self-adapting compensation method that suppresses the drift of Mach zehnder modulators bias point as claimed in claim 2, it is characterized in that the internal structure of described Mach zehnder modulators (102) comprising: the first lithium niobate waveguide (12), the second lithium niobate waveguide (13), electrode (11) and thermistor (14);
The resistance R of Mach zehnder modulators (102) waveguide place thermistor (14)
tExport bias point control circuit (103) to, with the resistance R of thermistor (14)
tVariation reflect the variation of a Mach zehnder modulators (102) waveguide place ambient temperature;
Along with the variation of Mach zehnder modulators (102) waveguide place ambient temperature, the bias point of Mach zehnder modulators (102) will drift about, simultaneously the resistance R of waveguide place thermistor (14)
tAlso change thereupon;
Measure Mach zehnder modulators (102) bias point drift value with the coefficient of deviation of variation of ambient temperature, according to coefficient of deviation bias point control circuit (103) is arranged, make the bias voltage V of bias point control circuit (103) output
BiasVariation with ambient temperature changes, and realizes the adaptive equalization of Mach zehnder modulators bias point drift.
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| CN102393574B (en) * | 2011-05-24 | 2015-07-22 | 中兴通讯股份有限公司 | Phase compensation device and method of pilot signals of lithium niobate modulator |
| EP2782270A1 (en) * | 2013-03-20 | 2014-09-24 | Xieon Networks S.à.r.l. | Optical IQ modulator control |
| CN103955247B (en) * | 2014-04-24 | 2015-12-02 | 电子科技大学 | A kind of device of stable micro-ring resonator spectrum |
| US9638981B2 (en) * | 2015-02-24 | 2017-05-02 | Huawei Technologies Co., Ltd. | Optical switch with improved switching efficiency |
| CN106209252B (en) * | 2016-05-27 | 2018-08-24 | 西安电子科技大学 | Cascade the arbitrary points MZM autobias control method |
| CN108076002B (en) * | 2016-11-10 | 2020-11-03 | 富士通株式会社 | Offset drift compensation device, received signal recovery device, and receiver |
| CN108387788B (en) * | 2018-01-23 | 2020-02-07 | 清华大学 | Optimal optical bias point screening method for preparing integrated common-path interference electric field sensor |
| CN110488414B (en) * | 2019-08-06 | 2020-12-04 | 上海交通大学 | Automatic calibration device and method for micro-ring assisted Mach-Zehnder optical switch |
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