WO2016116004A1 - Procédé et dispositif de régulation de tension de point de polarisation de modulateur - Google Patents

Procédé et dispositif de régulation de tension de point de polarisation de modulateur Download PDF

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Publication number
WO2016116004A1
WO2016116004A1 PCT/CN2016/070902 CN2016070902W WO2016116004A1 WO 2016116004 A1 WO2016116004 A1 WO 2016116004A1 CN 2016070902 W CN2016070902 W CN 2016070902W WO 2016116004 A1 WO2016116004 A1 WO 2016116004A1
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Prior art keywords
voltage value
modulator
optical signal
optical power
bias point
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PCT/CN2016/070902
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English (en)
Chinese (zh)
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尚冬冬
吉勇宁
李蒙
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中兴通讯股份有限公司
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Publication of WO2016116004A1 publication Critical patent/WO2016116004A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/25—Arrangements specific to fibre transmission

Definitions

  • the present invention relates to the field of communications, and in particular to a method and apparatus for controlling a modulator bias point voltage.
  • the optical phase modulation method represented by the 16QAM (Quadrature Amplitude Modulation) system has received more and more attention from the industry.
  • the hexadecimal quadrature amplitude modulation method is a combination of amplitude modulation and phase modulation. Its spectrum utilization is 4bit/s ⁇ Hz, which is twice that of QPSK, which can double the overall system capacity and meet the future. The need for high speed communication.
  • the 16QAM system modulator uses a lithium niobate modulator.
  • the lithium niobate modulator has its transmission characteristics, or the bias point, changes with temperature and stress due to the characteristics of its own material. Therefore, the bias point of the lithium niobate modulator must be kept in real time by a certain method. ,stable.
  • the modulator bias point for the 16QAM modulation system is controlled by adding pilot signals of various frequencies to the modulated signal of the lithium niobate modulator, and then separating from the output modulated signals.
  • the information of these pilot signals or their difference frequency signals is analyzed to control the stability of the bias point. Since multiple pilot signals are required, the control loop is complicated, and the pilot signal itself means that the stability of the bias point is limited.
  • Embodiments of the present invention provide a method and an apparatus for controlling a bias point voltage of a modulator to solve at least the problem that a modulator needs a plurality of pilot signals in the related art, so that the control loop is complicated.
  • a method for controlling a modulator bias point voltage including:
  • the first voltage value of the bias point is adjusted to a second voltage value in a predetermined step size, and the second voltage value is sent to a modulator; acquiring a second average optical power of the second feedback optical signal of the modulator, the second feedback optical signal corresponding to the second voltage value; if the second average optical power is The difference between the first average optical power is less than a preset threshold, and the second voltage value is used as the voltage value that meets the preset condition;
  • the voltage value that satisfies the preset condition is sent to the modulator to control the voltage of the bias point.
  • adjusting the second voltage value to the third step by using the predetermined step size And a third voltage value is sent to the modulator to obtain a third average optical power of the third feedback optical signal of the modulator, the third feedback optical signal corresponding to the third voltage value.
  • the third voltage value increases the second voltage value.
  • a voltage value obtained after the predetermined step size if the second voltage value is a voltage value obtained by decreasing the first voltage value by the predetermined step size, the third voltage value is The second voltage value decreases the voltage value obtained after the predetermined step size.
  • the acquiring the first average optical power of the first feedback optical signal of the modulator includes:
  • the first average optical power is obtained from the electrical signal.
  • the method for controlling the voltage of the modulator bias point further includes:
  • the voltage value that satisfies the preset condition is stored.
  • a control device for a modulator bias point voltage comprising: a first acquisition module configured to acquire a first voltage value of a preset bias point, and to a voltage value is sent to the modulator;
  • a second acquiring module configured to acquire a first average optical power of the first feedback optical signal of the modulator, where the first feedback optical signal corresponds to the first voltage value
  • a processing module configured to repeatedly perform the following operations until a voltage value that satisfies a preset condition is obtained: the first voltage value of the bias point is adjusted to a second voltage value in a predetermined step size, and the Transmitting a voltage value to the modulator; acquiring a second average optical power of the second feedback optical signal of the modulator, the second feedback optical signal corresponding to the second voltage value; if the second average And the difference between the optical power and the first average optical power is less than a preset threshold, and the second voltage value is used as the voltage value that meets the preset condition;
  • a control module configured to send the voltage value satisfying the preset condition to the modulator to control a voltage of the bias point.
  • the processing module is further configured to: if the difference between the second average optical power and the first average optical power is not less than the preset threshold, The second voltage value is adjusted to a third voltage value, and the third voltage value is sent to the modulator to acquire a third average optical power of the third feedback optical signal of the modulator, the third feedback light The signal corresponds to the third voltage value.
  • the third voltage value increases the second voltage value.
  • a voltage value obtained after the predetermined step size if the second voltage value is a voltage value obtained by decreasing the first voltage value by the predetermined step size, the third voltage value is The second voltage value decreases the voltage value obtained after the predetermined step size.
  • the second obtaining module includes:
  • a receiving unit configured to receive an output optical signal from the modulator
  • An optical coupling unit configured to divide the output optical signal into a first output optical signal for the modulator output, and the first feedback optical signal
  • the photoelectric conversion unit is configured to perform photoelectric conversion on the first feedback optical signal to obtain an electrical signal corresponding to the first feedback optical signal;
  • the optical power detecting unit is configured to obtain the first average optical power according to the electrical signal.
  • control device for the modulator bias point voltage further includes:
  • a storage unit configured to store the voltage value that satisfies a preset condition.
  • the first voltage value of the preset bias point is obtained, and the first voltage value is sent to the modulator, and the first feedback light corresponding to the first voltage value of the modulator is acquired.
  • the following operations are repeatedly performed until a voltage value that satisfies a preset condition is obtained: the first voltage value of the bias point is adjusted to a second voltage value in a predetermined step size, and Transmitting the second voltage value to the modulator; acquiring a second average optical power of the second feedback optical signal of the modulator, the second feedback optical signal corresponding to the second voltage value;
  • the difference between the second average optical power and the first average optical power is less than a preset a threshold, the second voltage value is used as the voltage value satisfying the preset condition, and further, the voltage value satisfying the preset condition is sent to the modulator to control the voltage of the bias point
  • FIG. 1 is a flow chart of a method of controlling a modulator bias point voltage according to an embodiment of the present invention
  • FIG. 2 is a block diagram showing the structure of a control device for a modulator bias point voltage according to an embodiment of the present invention
  • FIG. 3 is a block diagram showing the structure of a control device for another modulator bias point voltage according to an embodiment of the present invention.
  • FIG. 4 is a schematic structural diagram of another apparatus for controlling a bias point voltage of a modulator according to an embodiment of the present invention.
  • FIG. 5 is a schematic diagram showing the hardware structure of a control device for a modulator bias point voltage according to a preferred embodiment of the present invention
  • 6a is a schematic flow chart of a method for controlling a bias point voltage of a modulator according to an embodiment of the present invention
  • 6b is another flow diagram of a method of controlling a modulator bias point voltage in accordance with an implementation of the present invention.
  • FIG. 1 is a flowchart of a method for controlling a modulator bias point voltage according to an embodiment of the present invention. As shown in FIG. 1, the process includes The following steps:
  • Step S102 acquiring a first voltage value of a preset bias point, and transmitting the first voltage value to the modulator;
  • Step S104 acquiring a first average optical power of the first feedback optical signal of the modulator, where the first feedback optical signal corresponds to the first voltage value;
  • Step S106 repeating the following operations until a voltage value that satisfies the preset condition is obtained: the first voltage value of the bias point is adjusted to the second voltage value in a predetermined step size, and the second voltage value is sent to the modulator; Acquisition modulation The second average optical power of the second feedback optical signal, the second feedback optical signal corresponds to the second voltage value; if the difference between the second average optical power and the first average optical power is less than a preset threshold, the second The voltage value is a voltage value that satisfies a preset condition;
  • Step S108 transmitting a voltage value satisfying the preset condition to the modulator to control the voltage of the bias point.
  • the frequency signal makes the control loop complicated, and the method that the modulator does not need to add any pilot signal does not only solve the problem that the modulator needs multiple pilot signals in the related art, and the control loop is complicated, and the cost is low.
  • the control loop is simple and has a high stability effect, and the bias point voltage can also be controlled.
  • the second voltage value is adjusted to a third voltage value in a predetermined step size, and the third voltage value is sent To the modulator, a third average optical power of the third feedback optical signal of the modulator is obtained, and the third feedback optical signal corresponds to the third voltage value. That is, if the difference between the second average optical power and the first average optical power is not less than the preset threshold, the voltage value is continuously adjusted to quickly and efficiently determine the voltage of the optimal bias point.
  • the third voltage value is a voltage value obtained by increasing the second voltage value by a predetermined step size; If the second voltage value is a voltage value obtained by decreasing the first voltage value by a predetermined step, the third voltage value is a voltage value obtained by decreasing the second voltage value by a predetermined step. That is, in the case where the difference between the second average optical power and the first average optical power is not less than the preset threshold, the voltage value can be adjusted in the same step size, thereby quickly and efficiently determining the voltage of the optimal bias point.
  • acquiring the first average optical power of the first feedback optical signal of the modulator comprises: receiving an output optical signal from the modulator; dividing the output optical signal into a first output optical signal for the modulator output, and a first feedback optical signal; photoelectrically converting the first feedback optical signal to obtain an electrical signal corresponding to the first feedback optical signal; and obtaining a first average optical power according to the electrical signal. That is, the detection of the average optical power is realized by photoelectric conversion.
  • the method for controlling the modulator bias point voltage of the embodiment of the present invention further includes: storing a voltage value that meets a preset condition.
  • the voltage value is stored in the ROM and will be used directly after power-on.
  • the first voltage value of the preset bias point is obtained, and the first voltage value is sent to the modulator to obtain the first of the first feedback optical signal of the modulator corresponding to the first voltage value.
  • the following operations are repeatedly performed until a voltage value that satisfies the preset condition is obtained: the first voltage value of the bias point is adjusted to the second voltage value in a predetermined step size, and the second voltage value is sent to the modulation Obtaining a second average optical power of the second feedback optical signal of the modulator, where the second feedback optical signal corresponds to the second voltage value; if the difference between the second average optical power and the first average optical power is less than a preset threshold, Then, the second voltage value is used as a voltage value that satisfies a preset condition, and further, a voltage solution that satisfies the preset condition is sent to the modulator to control the voltage of the bias point.
  • the modulator needs a plurality of pilot signals, which makes
  • a control device for the bias point voltage of the modulator is also provided, and the device is configured to implement the above-mentioned embodiments and preferred embodiments, and the description thereof has been omitted.
  • the term "module” may implement a combination of software and/or hardware of a predetermined function.
  • FIG. 2 is a structural block diagram of a control device for a modulator bias point voltage according to an embodiment of the present invention. As shown in FIG. 2, the device includes:
  • the first obtaining module 202 is configured to acquire a first voltage value of a preset bias point, and send the first voltage value to the modulator;
  • the second obtaining module 204 is configured to obtain a first average optical power of the first feedback optical signal of the modulator, where the first feedback optical signal corresponds to the first voltage value;
  • the processing module 206 is configured to repeatedly perform the following operations until a voltage value that satisfies the preset condition is obtained: the first voltage value of the bias point is adjusted to the second voltage value in a predetermined step size, and the second voltage value is sent to a modulator; obtaining a second average optical power of the second feedback optical signal of the modulator, the second feedback optical signal corresponding to the second voltage value; if the difference between the second average optical power and the first average optical power is less than a preset threshold And using the second voltage value as a voltage value that satisfies a preset condition;
  • the control module 208 is configured to send a voltage value that satisfies the preset condition to the modulator to control the voltage of the bias point.
  • the processing module 206 is further configured to adjust the second voltage value to a third voltage value by a predetermined step if the difference between the second average optical power and the first average optical power is not less than a preset threshold. And transmitting a third voltage value to the modulator to obtain a third average optical power of the third feedback optical signal of the modulator, the third feedback optical signal corresponding to the third voltage value.
  • the third voltage value is a voltage value obtained by increasing the second voltage value by a predetermined step size; If the second voltage value is a voltage value obtained by decreasing the first voltage value by a predetermined step, the third voltage value is a voltage value obtained by decreasing the second voltage value by a predetermined step.
  • the second obtaining module 204 includes:
  • the receiving unit 302 is configured to receive an output optical signal from the modulator
  • the optical coupling unit 304 is configured to divide the output optical signal into a first output optical signal for the modulator output, And a first feedback optical signal;
  • the photoelectric conversion unit 306 is configured to perform photoelectric conversion on the first feedback optical signal to obtain an electrical signal corresponding to the first feedback optical signal;
  • the optical power detecting unit 308 is configured to obtain a first average optical power according to the electrical signal.
  • FIG. 4 is a schematic structural diagram of another apparatus for controlling a bias point voltage of a modulator according to an embodiment of the present invention.
  • a device for controlling a bias point voltage of a modulator according to an embodiment of the present invention is further provided. include:
  • the storage unit 402 is configured to store a voltage value that satisfies a preset condition.
  • the first voltage value of the preset bias point is obtained, and the first voltage value is sent to the modulator to obtain the first of the first feedback optical signal of the modulator corresponding to the first voltage value.
  • the following operations are repeatedly performed until a voltage value that satisfies the preset condition is obtained: the first voltage value of the bias point is adjusted to the second voltage value in a predetermined step size, and the second voltage value is sent to the modulation Obtaining a second average optical power of the second feedback optical signal of the modulator, where the second feedback optical signal corresponds to the second voltage value; if the difference between the second average optical power and the first average optical power is less than a preset threshold, Then, the second voltage value is used as a voltage value that satisfies a preset condition, and further, a voltage solution that satisfies a preset condition is sent to the modulator to control the voltage of the bias point, and the modulator needs to be solved in the related art.
  • the pilot signals make the
  • the technical problem to be solved by the embodiments of the present invention is to provide a control method and device for a bias point of a 16QAM system modulator that is low in cost, easy to implement, simple in control loop, and high in stability, so that the bias of the 16QAM system modulator is The set point is relatively stable and the control is simple, thereby improving the stability of the system.
  • the embodiment of the invention further provides a method for controlling a modulator bias point in a 16QAM modulation system, comprising the following steps:
  • Embodiments of the present invention provide a control device for a modulator bias point in a 16QAM modulation system, which may include the following components:
  • PIN tube Bandwidth 10G, photoelectric conversion in the feedback loop.
  • Radio Frequency Power Detector RFPD: Root Meam Square-Direct Current (RMS-DC) chip, the main function is Convert the rms value of the signal to a dc output.
  • RFPD Radio Frequency Power Detector
  • RMS-DC Root Meam Square-Direct Current
  • ADC Analog-to-Digital Converter
  • DAC Digital-to-Analog Converter
  • Micro Control Unit/digital signal processing (MCU/DSP) is set as the implementation of the feedback control algorithm.
  • Embodiments of the present invention provide a low-cost 16QAM modulator bias point control scheme based on digital processing, which has the following beneficial effects:
  • the average power detection and digitization processing manner can achieve relatively stable bias point of the 16QAM modulator.
  • the present invention does not require any additional pilot signals, has a simple and easy to implement structure, has the advantages of high precision, high reliability, high responsivity, and flexible and simple control loop, and achieves a bias of 16QAM modulator. Point control is more convenient and facilitates debugging.
  • the new 16QAM modulator system includes optocoupler, PIN tube, RF power detector, analog-to-digital converter, digital-to-analog converter and digital algorithm processing unit module to enable fast, stable and accurate implementation of 16QAM modulators.
  • the locking of the bias point is not limited to the built-in PD bandwidth of the modulator, which is of great significance for the transmission of the ultra-100G dense wavelength division system.
  • an embodiment of the present invention provides a preferred embodiment as shown in FIG. 5.
  • the optical signal emitted from the laser is divided into EV and EH through a polarization beam splitter (PBS).
  • the EV and EH are respectively divided into I light by the first 3dB coupler and the second 3dB coupler.
  • the DSP adjusts the bias point feedback control signal to be converted into an analog voltage signal by the DAC, respectively, to control the first MZ modulator, the second MZ modulator, the third MZ modulator and the fourth MZ modulator. Set the point so that the average power finally detected is minimized. Ultimately, the correct biasing of the IQ bias point of the 16QAM modulator can be achieved.
  • the output light is divided into output light and feedback light through a 5/95 coupler, 95% of which is used for the final 16QAM modulated output, and 5% of the output light is photoelectrically converted by the 10G PIN tube, and then the effective value of the signal is measured by RFPD.
  • Converted to DC output the high-precision ADC collects the power into the digital signal processing chip DSP, and the DSP adjusts the bias point feedback control signal to be converted into an analog voltage signal by the DAC to control the bias point of the 16QAM modulator, so that the average power is finally detected.
  • the smallest, that is, the correct offset of the phase bias point of the 16QAM modulator can be achieved.
  • FIG. 6a and FIG. 6b A digital algorithm flow chart for implementing bias point voltage control of a 16QAM modulator in a DSP according to an embodiment of the present invention is shown in FIG. 6a and FIG. 6b:
  • the DSP sends a midpoint value of the bias point (usually 3.5V), which is sent to the I and Q channels respectively through the DAC, and the output optical signal detected by the PD is collected by the ADC.
  • the DSP reads the ADC data as the initial average optical power value.
  • step size of 0.05V (according to the actual offset accuracy and modulation rate requirements can have different settings) increase / decrease the voltage value of the bias point, send again through the DSP, read the ADC value as new Average optical power value.
  • the DSP compares the new average optical power value with the initial average optical power value. If the new value is less than the initial value, the new average optical power value is taken as the initial average optical power value, and the voltage value of the bias point is continuously increased/decreased, and step 2 is repeated; if the new value is greater than the initial value, the initial average is maintained. The optical power value is unchanged, the voltage value of the bias point is decreased/increased, and the ADC value is read as a new average optical power value.
  • step 3 If step 3 so that the new average optical power value minus the initial optical power value is less than a certain small amount (represented by the voltage value, generally considered to be less than 0.001V), then the bias point at this time is the optimal bias. point. Store the offset point in the ROM of the DSP and use it directly after power-on.
  • step 3 Repeat step 3 to follow the change in the bias point to ensure that the real-time bias point is in the proper position.
  • the relationship of the amplitude of the 16QAM signal: relative to the DAC output, the I/Q path has two voltage amplitudes respectively, such that the high voltages V HI , V HQ , the low voltages V LI , V LQ .
  • I/Q bias point automatic control For I signal, among them, Representing the phase of the first layer and the second layer constellation point in the constellation diagram, respectively, V ⁇ is the voltage required for the modulator phase change ⁇ .
  • the average optical power of the I channel is:
  • the average optical power has a minimum value; then, by feedback, the average output optical power is minimized to obtain the optimal bias point, that is, the lowest point of the bias point.
  • the Q way bias point is the same.
  • the best IQ bias point is obtained when the PD detects the optical power to a minimum.
  • V I denotes the voltage of I
  • V bI denotes the bias voltage of I
  • V Q denotes the voltage of Q
  • V bQ denotes Q Bias voltage
  • the modulator output optical signal is detected with a PIN tube, an amplitude and In proportion, the rate is a non-return to zero (NRZ) signal of the modulation signal rate.
  • the power of a certain bandwidth of the signal is detected, and by changing the position of the phase offset point to minimize it, the phase bias point can be controlled.
  • modules or steps of the present invention described above can be implemented by a general-purpose computing device that can be centralized on a single computing device or distributed across a network of multiple computing devices. Alternatively, they may be implemented by program code executable by the computing device such that they may be stored in the storage device by the computing device and, in some cases, may be different from the order herein.
  • the steps shown or described are performed, or they are separately fabricated into individual integrated circuit modules, or a plurality of modules or steps thereof are fabricated as a single integrated circuit module.
  • the invention is not limited to any specific combination of hardware and software.
  • the method and apparatus for controlling the bias point voltage of a modulator provided by the embodiments of the present invention have the following beneficial effects: solving the problem that the modulator needs multiple pilot signals in the related art, and the control loop is complicated. In turn, the effect of low cost, simple control loop and high stability is achieved.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
  • Optical Communication System (AREA)

Abstract

La présente invention concerne un procédé et un dispositif permettant de réguler une tension d'un point de polarisation d'un modulateur. Le procédé consiste à : acquérir une première valeur de tension d'un point de polarisation prédéfini, et envoyer la première valeur de tension à un modulateur ; acquérir une première puissance optique moyenne d'un premier signal optique de rétroaction du modulateur ; répéter les opérations suivantes, jusqu'à l'obtention d'une valeur de tension satisfaisant à une condition prédéfinie : ajuster la première valeur de tension du point de polarisation sur une seconde valeur de tension conformément à une longueur de pas prédéfinie, et envoyer la seconde valeur de tension au modulateur ; acquérir une seconde puissance optique moyenne d'un second signal optique de rétroaction du modulateur ; et si une différence entre la seconde puissance optique moyenne et la première puissance optique moyenne est inférieure à un seuil prédéfini, utiliser la seconde valeur de tension en tant que valeur de tension satisfaisant à la condition prédéfinie ; et envoyer la valeur de tension satisfaisant à la condition prédéfinie au modulateur, pour réguler une tension du point de polarisation. Au moyen de la présente invention, au moins le problème des technologies connexes selon lequel une boucle de régulation est complexe en raison du fait qu'un modulateur a besoin de multiples signaux pilotes est résolu.
PCT/CN2016/070902 2015-01-23 2016-01-14 Procédé et dispositif de régulation de tension de point de polarisation de modulateur WO2016116004A1 (fr)

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CN107769857B (zh) * 2016-08-22 2021-05-11 中兴通讯股份有限公司 一种光信号调制处理方法、装置及系统
CN106301554B (zh) 2016-08-31 2019-01-22 武汉光迅科技股份有限公司 一种并联mzi电光调制器工作点电压的调试方法及调试装置
CN108306689B (zh) * 2018-01-13 2020-08-11 西安电子科技大学 基于三导频的双平行马赫-曾德尔调制器(dpmzm)的任意点自动偏压控制方法
CN113315571A (zh) * 2020-08-31 2021-08-27 阿里巴巴集团控股有限公司 硅光模块的监控方法及装置

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CN101909029A (zh) * 2010-07-14 2010-12-08 中兴通讯股份有限公司 Dqpsk调制器偏置点的控制方法和系统
WO2013164603A1 (fr) * 2012-05-02 2013-11-07 Bae Systems Plc Régulation de tensions de polarisation pour modulateurs optiques
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