CN101807085A - Device for controlling and driving biasing and method for controlling and driving light intensity modulator - Google Patents
Device for controlling and driving biasing and method for controlling and driving light intensity modulator Download PDFInfo
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- CN101807085A CN101807085A CN201010123461A CN201010123461A CN101807085A CN 101807085 A CN101807085 A CN 101807085A CN 201010123461 A CN201010123461 A CN 201010123461A CN 201010123461 A CN201010123461 A CN 201010123461A CN 101807085 A CN101807085 A CN 101807085A
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Abstract
The invention discloses a device for controlling and driving biasing and a method for controlling and driving a light intensity modulator. The device for controlling and driving the biasing comprises three circuit modules, namely a temperature control circuit module, a biasing circuit module and a radio frequency driver circuit module. The method for controlling and driving the light intensity modulator comprises the step of reducing the reflection loss by regulating the working temperature of the light intensity modulator through the temperature control circuit module, by regulating a direct current working point of the light intensity modulator through the biasing circuit module, and by regulating the radio frequency input of the light intensity modulator through the radio frequency driver circuit module. The device for controlling and driving the biasing provided by the invention has the advantages of high reliability and simple circuit. Due to the adoption of the method for controlling and driving the light intensity modulator provided by the invention, constant temperature, constant direct current working point and work with wide bandwidth of the light intensity modulator can be realized, and simultaneously the extinction ratio is high and stable in a long term.
Description
Technical field
The present invention relates to the optical communication technique field, relate in particular to a kind of high precision biasing control and drive unit and control corresponding and driving method that is used for Mach-Zehnder Mach-Zehender (M-Z) type light intensity modulator.
Background technology
Photomodulator also claims electrooptic modulator, is the Primary Component of high speed, long-distance optical communication, also is one of most important integrated optical device.It is the device by refractive index, absorptivity, amplitude or the phase place of the variation final regulation and control output light of voltage or electric field.The basic theories of its institute's foundation is various multi-form electrooptical effects, acoustooptic effect, magneto-optic effect, charge carrier effect of dispersion etc.In the light emission of whole optical communication, transmission, receiving course, photomodulator is used to control light intensity, and its effect is very important.
Mach-Zehnder Mach-Zehender (M-Z) type light intensity modulator is that input light is divided into two light branch roads that the equal signal of two-way enters modulator respectively, the material that these two light branch roads adopt is the electric light material, and its refractive index changes with the electric signal size that the outside applies.Because the variations in refractive index of light branch road can cause the variation of signal phase, when two tributary signal modulator output terminals combine once more, synthetic light signal will be the interference signal of an intensity size variation, be equivalent to the variation of electric signal has been converted to the variation of light signal, realized the modulation of light intensity.
In the last few years, because lithium niobate (LiNbO
3) characteristic such as low-loss of waveguide, high electrical efficiency, lithium niobate obtains use more and more widely in the photomodulator of 2.5Gb/s and higher rate.LiNbO based on Mach-Zehnder (M-Z) waveguiding structure
3Travelling-wave modulator has become most popular modulator in the existing system.
The important parameter of weighing Mach-Zehnder (M-Z) type light intensity modulator comprises the waveform and the frequency of the light modulated that delustring is when exported, so-called extinction ratio is meant the logarithm of the power ratio of high level signal and low level signal output light, extinction ratio directly influences the sensitivity of optical receiving end, extinction ratio is big more, the sensitivity of receiving end is high more, but the pattern associated jitter of laser instrument also increases simultaneously, and it is very important therefore keeping suitable extinction ratio.Concerning light intensity modulator, extinction ratio is controlled by the biasing input voltage of light intensity modulator, this biasing input voltage provides dc point for light intensity modulator, the waveform of the light modulated of output and frequency then are subjected to the influence of radio frequency input waveform, and it is very crucial therefore guaranteeing the stable of light intensity modulator dc point and choosing suitable radio frequency input waveform.
Yet generally all there is dc shift in modulator, thereby influences the extinction ratio of light intensity modulator, and then influences the reliability of light intensity modulator, simultaneously, and for LiNbO
3Electrooptic modulator also must be considered matching transition technology coaxial and little band, and the matching transition technology of resolving coaxial and little band is to guarantee the microwave signal input impedance matching, reduces reflection loss, and important one of realization wideband operation is encircled.
Summary of the invention
The invention provides a kind of method of setover control and drive unit and control and driving light intensity modulator, to solve the dc shift based on the M-Z type light intensity modulator of lithium niobate, technical matterss such as matching transition.
For addressing the above problem, the present invention proposes a kind of High Accuracy Control device, and described High Accuracy Control device comprises:
The temperature-control circuit module is used to obtain the temperature signal of described light intensity modulator, the temperature that produces corresponding adjustment signal and regulate light intensity modulator according to described temperature signal;
The biasing circuit module is used to obtain the PD output signal of described light intensity modulator, and described PD output signal is carried out analog to digital conversion, generates bias voltage control signal, the bias voltage size of control light intensity modulator; And
The radio-frequency (RF) driver circuit module is used for the waveform of a microwave input signal is adjusted, and produces corresponding radiofrequency signal, and inputs to described light intensity modulator.
Optionally, described temperature-control circuit module comprises the high precision integrated temperature sensor that connects successively, high-precision temperature control module and refrigerator, wherein the input end of high precision integrated temperature sensor is connected with described light intensity modulator, the output terminal of refrigerator is connected with described light intensity modulator, the high precision integrated temperature sensor reads in the temperature signal of light intensity modulator, and this temperature signal is converted to level signal outputs to the high-precision temperature control module, the high-precision temperature control module is temperature signal with this conversion of signals and compares with the standard temperature of setting, export a control signal to refrigerator, refrigerator is according to the power of the control signal adjustment refrigeration of high-precision temperature control module output, thus the working temperature of adjustment light intensity modulator.
Optionally, described refrigerator has a heat radiating metal outer casing base, and described heat radiating metal outer casing base is fixed on the fan heat radiator of light intensity modulator.
Optionally, described heat radiating metal outer casing base is fixed on by mounting hole site on the fan heat radiator of light intensity modulator, and fill with thermal grease conduction in the slit between described mounting hole site and the heat radiating metal outer casing base.
Optionally, described biasing circuit module comprises the high precision PD Optical Receivers of serial connection successively, the high-precision A collector, microprocessor and high precision D/A output control module, described light intensity modulator is exported a light signal, described high precision PD Optical Receivers converts described light signal to analog voltage signal, the analog voltage signal that described high-precision A collector reads in the output of PD Optical Receivers is a digital signal with this analog signal conversion also, described microprocessor reads in the digital signal of high-precision A collector output and this signal is carried out software algorithm handle, export a control signal, the control signal of described high precision D/A output control module reading into the microprocessor output, regulate the size of output offset voltage and shake voltage, its output terminal connects the bias voltage input end of light intensity modulator.
Optionally, described high precision PD Optical Receivers adopts the ultra-low noise operational amplifier to realize that its gain amplifier is any yield value of one between 0～28dB.
Optionally, described high-precision A collector comprises AD prime amplifier, AD converter and CPLD, and described CPLD provides sequential control for described high-precision A collector.
Optionally, described radio-frequency (RF) driver circuit module mainly comprises high-precision radio frequency burst pulse biasing driver module, described high-precision radio frequency burst pulse biasing driver module comprises input end, output terminal and synchronous signal output end, described input end is used to receive described microwave input signal, described output terminal links to each other with the rf inputs of light intensity modulator, and described synchronous signal output end is used to export the radio frequency synchronizing signal and uses for the external radio frequency synchronism detection.
Optionally, described high precision RF burst pulse biasing driver module adopts the matching transition technology of high speed RF amplifier and little band to design.
For addressing the above problem, the present invention also proposes a kind of control and drives the method for light intensity modulator, is used to control the working temperature of light intensity modulator, and dc point and radio frequency input comprise the following steps:
Obtain the temperature signal of light intensity modulator, the temperature that produces corresponding adjustment signal and regulate light intensity modulator according to described temperature signal is so that light intensity modulator keeps constant temperature;
Obtain the PD output signal of light intensity modulator, described PD output signal is carried out analog to digital conversion, generate bias voltage control signal, the bias voltage size of control light intensity modulator;
Produce corresponding radiofrequency signal according to a microwave input signal, input to light intensity modulator.
Biasing control provided by the present invention and drive unit adopt special-purpose dynamic auto search control circuit to realize, the reliability height, and circuit is simple.
The method of control provided by the present invention and driving light intensity modulator is simple and reliable, can realize light intensity modulator constant temperature, permanent dc point and big bandwidth work, while extinction ratio height, long-term stability.
Description of drawings
The biasing control that Fig. 1 provides for the embodiment of the invention and the general structure synoptic diagram of drive unit.
Embodiment
Below in conjunction with the drawings and specific embodiments the biasing control of the present invention's proposition and the method for drive unit and control and driving light intensity modulator are described in further detail.According to the following describes and claims, advantages and features of the invention will be clearer.It should be noted that accompanying drawing all adopts very the form of simplifying and all uses non-ratio accurately, only in order to convenient, the purpose of the aid illustration embodiment of the invention lucidly.
Core concept of the present invention is, a kind of biasing control and drive unit are provided, its reliability height, and circuit is simple.The method of a kind of control and driving light intensity modulator is provided simultaneously, and this method is simple and reliable, can realize light intensity modulator constant temperature, permanent dc point and big bandwidth work, while extinction ratio height, long-term stability.
Please refer to Fig. 1, the biasing control that Fig. 1 provides for the embodiment of the invention and the general structure synoptic diagram of drive unit, as shown in Figure 1, this biasing control and drive unit comprise temperature-control circuit module 100, biasing circuit module 200 and radio-frequency (RF) driver circuit module 300, wherein, described temperature-control circuit module 100 is used to obtain the temperature signal of light intensity modulator 10, the temperature that produces corresponding adjustment signal and regulate light intensity modulator 10 according to described temperature signal.Described biasing circuit module 200 is used to obtain the PD output signal of light intensity modulator 10, and described PD output signal is carried out analog to digital conversion, generates bias voltage control signal, the bias voltage size of control light intensity modulator 10.Described radio-frequency (RF) driver circuit module 300 is used for the waveform of microwave input signal is adjusted, and produces corresponding radiofrequency signal, and inputs to light intensity modulator 10.
Respectively described temperature-control circuit module 100, biasing circuit module 200 and radio-frequency (RF) driver circuit module 300 are specifically described below, as shown in Figure 1, described temperature-control circuit module 100 comprises integrated temperature sensor 110, high-precision temperature control module 120 and the refrigerator 130 of polyphone successively, the input end of described integrated temperature sensor 110 is connected with light intensity modulator 10, and the output terminal of described refrigerator 130 links to each other with light intensity modulator 10.Described high precision integrated temperature sensor 110 reads in the temperature signal of light intensity modulator 10, and this temperature signal is converted to the Temperature Feedback input end that level signal outputs to high-precision temperature control module 120, high-precision temperature control module 120 is temperature signal with this conversion of signals and compares with the standard temperature of setting, export a control signal to refrigerator 130, refrigerator 130 is according to the power of the control signal adjustment refrigeration of high-precision temperature control module output, thus the working temperature of adjustment light intensity modulator 10.
Described high-precision temperature control module 120 adopts special-purpose temperature control integrated circuit to realize.Described refrigerator 130 has a heat radiating metal outer casing base, described heat radiating metal outer casing base is fixed on the fan heat radiator of light intensity modulator 10 by mounting hole site, fill with thermal grease conduction in slit between described mounting hole site and the heat radiating metal outer casing base, thereby can dispel the heat better.
Described biasing circuit module 200 comprises the high precision PD Optical Receivers 210 of serial connection successively, high-precision A collector 220, microprocessor 230 and high precision D/A output control module 240, described high precision PD Optical Receivers 210 links to each other with the PD output terminal 11 of light intensity modulator 10, receive the light signal of PD output terminal 11 outputs, and convert described light signal to analog voltage signal, the analog voltage signal that described high-precision A collector 220 reads in 210 outputs of PD Optical Receivers is a digital signal with this analog signal conversion also, described microprocessor 230 reads in the digital signal of high-precision A collector 220 outputs and this signal is carried out software algorithm handle, export a control signal, the control signal of described high precision D/A output control module 240 reading into the microprocessor 230 outputs, regulate the size of output offset voltage and shake voltage, its output terminal connects the bias voltage input end 12 of light intensity modulator 10.
Described high precision PD Optical Receivers 210 adopts the ultra-low noise operational amplifier to realize, its gain amplifier is controlled, can realize any yield value between 0～28dB, by the control to gain amplifier, the signal amplitude that can make 210 outputs of high precision PD Optical Receivers is in a reasonable range.
Described high-precision A collector comprises AD prime amplifier, AD converter and CPLD (CPLD), and described CPLD provides sequential control for described high-precision A collector.
Described radio-frequency (RF) driver circuit module 300 mainly comprises high-precision radio frequency burst pulse biasing driver module 310, described high-precision radio frequency burst pulse biasing driver module 310 comprises input end, output terminal and synchronous signal output end, described input end is used to receive microwave input signal, the waveform of 310 pairs of these microwave signals of described high-precision radio frequency burst pulse biasing driver module is adjusted, and adjusted microwave signal being input to the rf inputs 13 of light intensity modulator 10 by output terminal, described synchronous signal output end is used to export the radio frequency synchronizing signal and uses for the external radio frequency synchronism detection.
The circuit of described high-precision radio frequency burst pulse biasing driver module 310 adopts the matching transition technology of high speed RF amplifier and little band to design, guaranteed the microwave signal input impedance matching of light intensity modulator 10, greatly reduced simultaneously reflection loss, for the external RF signals input provides bias voltage and driving force, thereby realize the big broadband light modulation work of light intensity modulator 10.
As shown in Figure 1, the method for utilizing above-mentioned biasing control and drive unit to control and drive light intensity modulator may further comprise the steps:
(1) obtain the temperature signal of light intensity modulator, the temperature that produces corresponding adjustment signal and regulate light intensity modulator according to described temperature signal is so that light intensity modulator keeps constant temperature; Concrete handling procedure is as follows:
Set the standard temperature that end is set light intensity modulator 10 work from the standard temperature of high-precision temperature control module 120;
Read in the actual work temperature of light intensity modulator 10 by integrated temperature sensor 110, and convert the temperature signal that reads in to analog voltage signal;
The chip of high-precision temperature control module 120 reads in the analog voltage signal of integrated temperature sensor 110 outputs, this conversion of signals is become temperature signal, and by the ratio of chip internal, integration, differential control (PID control) chip the standard temperature of this temperature signal and setting is compared, export a control signal;
Thereby the potential difference (PD) that refrigerator 130 is adjusted its two ends according to the control signal of high-precision temperature control module 120 outputs is adjusted its working current (promptly controlling the power of its refrigeration or heating), realize the high-precision temperature of light intensity modulator 10 is controlled with this, guarantee its constant temperature work.
(2) PD that obtains light intensity modulator exports light signal, and this light signal carries out analog to digital conversion to described PD output signal, generates bias voltage control signal, the bias voltage size of control light intensity modulator; Concrete handling procedure is as follows:
High precision PD Optical Receivers 210 is imported the light signal fed back of PD detector 11 outputs of light intensity modulator 10, and converts this light signal fed back to suitable analog voltage signal;
High-precision A collector 220 reads in the level signal of PD Optical Receivers 210 outputs, and this signal is gathered and analog to digital conversion;
The control signal of high precision D/A output control module 240 reading into the microprocessor 230 outputs, regulate the size of output offset voltage and shake voltage, its output terminal connects the bias voltage input end 12 of light intensity modulator 10, realize the DC operation point control of high-precision light intensity modulator with this, make the dc point of light intensity modulator constant, thereby make its extinction ratio stable.
(3) produce corresponding radiofrequency signal according to a microwave input signal, input to light intensity modulator.Concrete handling procedure is: microwave input signal is input to the signal input part of high-precision radio frequency burst pulse biasing driver module 310, described high-precision radio frequency burst pulse biasing driver module 310 advances and the adjustment of frequency row the waveform of the microwave signal of input as required, and output to the rf inputs 13 of light intensity modulator by output terminal, also supply external radio frequency synchronism detection usefulness simultaneously, thereby the waveform and the frequency that guarantee the light modulated of light intensity modulator 10 outputs meet the requirements by synchronous signal output end output radio frequency synchronizing signal.
And because the circuit of high-precision radio frequency burst pulse biasing driver module 310 adopts the matching transition technology of high-speed radio-frequency amplifier and little band to design, guaranteed the microwave signal input impedance matching of light intensity modulator 10, greatly reduced simultaneously reflection loss, for the external radio-frequency signal input provides bias voltage and driving force, thereby realize the big broadband light modulation work of light intensity modulator 10.
In sum, the invention provides a kind of biasing control and drive unit, this device comprises temperature-control circuit module, biasing circuit module and radio-frequency (RF) driver circuit module.Its reliability height, circuit is simple.
Simultaneously, the present invention also provides a kind of method of utilizing described biasing control and drive unit to control and drive light intensity modulator, this method is utilized the working temperature of the temperature-control circuit module controls light intensity modulator of described biasing control and drive unit, utilize the dc point of biasing circuit module controls light intensity modulator, utilize the bandwidth of operation of waveform, frequency and the light intensity modulator of radio-frequency (RF) driver circuit module controls light intensity modulator radio-frequency input signals.This method is simple and reliable, can realize light intensity modulator constant temperature, permanent dc point and big bandwidth work, while extinction ratio height, long-term stability.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, if these of invention are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.
Claims (10)
1. a biasing is controlled and drive unit, is used for the biasing control and the driving of light intensity modulator, it is characterized in that, comprising:
The temperature-control circuit module is used to obtain the temperature signal of described light intensity modulator, the temperature that produces corresponding adjustment signal and regulate light intensity modulator according to described temperature signal;
The biasing circuit module is used to obtain the PD output signal of described light intensity modulator, and described PD output signal is carried out analog to digital conversion, generates bias voltage control signal, the bias voltage size of control light intensity modulator; And
The radio-frequency (RF) driver circuit module is used for the waveform of a microwave input signal is adjusted, and produces corresponding radiofrequency signal, and inputs to described light intensity modulator.
2. biasing control as claimed in claim 1 and drive unit, it is characterized in that, described temperature-control circuit module comprises the high precision integrated temperature sensor that connects successively, high-precision temperature control module and refrigerator, wherein the input end of high precision integrated temperature sensor is connected with described light intensity modulator, the output terminal of refrigerator is connected with described light intensity modulator, the high precision integrated temperature sensor reads in the temperature signal of light intensity modulator, and this temperature signal is converted to level signal outputs to the high-precision temperature control module, the high-precision temperature control module is temperature signal with this conversion of signals and compares with the standard temperature of setting, export a control signal to refrigerator, refrigerator is according to the power of the control signal adjustment refrigeration of high-precision temperature control module output, thus the working temperature of adjustment light intensity modulator.
3. biasing control as claimed in claim 2 and drive unit is characterized in that, described refrigerator has a heat radiating metal outer casing base, and described heat radiating metal outer casing base is fixed on the fan heat radiator of light intensity modulator.
4. biasing control as claimed in claim 3 and drive unit, it is characterized in that, described heat radiating metal outer casing base is fixed on by mounting hole site on the fan heat radiator of light intensity modulator, and fill with thermal grease conduction in the slit between described mounting hole site and the heat radiating metal outer casing base.
5. biasing control as claimed in claim 1 and drive unit, it is characterized in that, described biasing circuit module comprises the high precision PD Optical Receivers of serial connection successively, the high-precision A collector, microprocessor and high precision D/A output control module, described light intensity modulator is exported a light signal, described high precision PD Optical Receivers converts described light signal to analog voltage signal, described high-precision A collector reads in the analog voltage signal of PD Optical Receivers output and this analog voltage signal is converted to digital signal, described microprocessor reads in the digital signal of high-precision A collector output and this signal is carried out software algorithm handle, export a control signal, the control signal of described high precision D/A output control module reading into the microprocessor output, regulate the size of output offset voltage and shake voltage, its output terminal connects the bias voltage input end of light intensity modulator.
6. biasing control as claimed in claim 5 and drive unit is characterized in that, described high precision PD Optical Receivers adopts the ultra-low noise operational amplifier to realize that its gain amplifier is any yield value of one between 0～28dB.
7. biasing control as claimed in claim 5 and drive unit, it is characterized in that, described high-precision A collector comprises AD prime amplifier, AD converter and CPLD, and described CPLD provides sequential control for described high-precision A collector.
8. biasing control as claimed in claim 1 and drive unit, it is characterized in that, described radio-frequency (RF) driver circuit module mainly comprises high-precision radio frequency burst pulse biasing driver module, described high-precision radio frequency burst pulse biasing driver module comprises input end, output terminal and synchronous signal output end, described input end is used to receive described microwave input signal, described output terminal links to each other with the rf inputs of light intensity modulator, and described synchronous signal output end is used to export the radio frequency synchronizing signal and uses for the external radio frequency synchronism detection.
9. biasing control as claimed in claim 8 and drive unit is characterized in that, described high precision RF burst pulse biasing driver module adopts the matching transition technology of high speed RF amplifier and little band to design.
10. a control and drive the method for light intensity modulator is used to control the working temperature of light intensity modulator, and dc point and radio frequency input is characterized in that, comprise the following steps:
Obtain the temperature signal of light intensity modulator, the temperature that produces corresponding adjustment signal and regulate light intensity modulator according to described temperature signal is so that light intensity modulator keeps constant temperature;
Obtain the PD output signal of light intensity modulator, described PD output signal is carried out analog to digital conversion, generate bias voltage control signal, the bias voltage size of control light intensity modulator;
Produce corresponding radiofrequency signal according to a microwave input signal, input to light intensity modulator.
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| CN102200671A (en) * | 2011-04-25 | 2011-09-28 | 索尔思光电（成都）有限公司 | Extinction ratio debugging device and method of optical module |
| CN102215063A (en) * | 2011-05-31 | 2011-10-12 | 索尔思光电（成都）有限公司 | Core parameter debugging method of long-reach 10 gigabit small form factor pluggable (XFP) module based on electro-absorption modulated laser (EML) |
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| CN106506092A (en) * | 2016-12-22 | 2017-03-15 | 中国计量大学 | A kind of low noise radio-frequency light transmission module of wide temperature range work |
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| CN109412699A (en) * | 2018-11-28 | 2019-03-01 | 武汉邮电科学研究院有限公司 | Pulse generation method, device, coherent phase sensitivity time domain reflection method and system |
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| CN109974617A (en) * | 2019-04-01 | 2019-07-05 | 湖北工业大学 | The control method of light intensity consistency in a kind of multi-wavelength interferometry |
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Application publication date: 20100818 |