WO2009010007A1 - Procédé, appareil et modulateur optique pour ajustement de phase - Google Patents

Procédé, appareil et modulateur optique pour ajustement de phase Download PDF

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Publication number
WO2009010007A1
WO2009010007A1 PCT/CN2008/071642 CN2008071642W WO2009010007A1 WO 2009010007 A1 WO2009010007 A1 WO 2009010007A1 CN 2008071642 W CN2008071642 W CN 2008071642W WO 2009010007 A1 WO2009010007 A1 WO 2009010007A1
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WO
WIPO (PCT)
Prior art keywords
signal
response signal
low frequency
difference
frequency disturbance
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PCT/CN2008/071642
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English (en)
Chinese (zh)
Inventor
Xiaoyan Fan
Original Assignee
Huawei Technologies Co., Ltd.
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Publication date
Application filed by Huawei Technologies Co., Ltd. filed Critical Huawei Technologies Co., Ltd.
Publication of WO2009010007A1 publication Critical patent/WO2009010007A1/fr

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Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/0121—Operation of devices; Circuit arrangements, not otherwise provided for in this subclass
    • G02F1/0123—Circuits for the control or stabilisation of the bias voltage, e.g. automatic bias control [ABC] feedback loops
    • 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
    • H04B10/50—Transmitters
    • H04B10/501—Structural aspects
    • H04B10/503—Laser transmitters
    • H04B10/505—Laser transmitters using external modulation
    • 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
    • H04B10/50—Transmitters
    • H04B10/58—Compensation for non-linear transmitter output

Definitions

  • the present invention relates to the field of communications technologies, and more particularly to a method, apparatus, and optical modulator for phase adjustment.
  • optical communication With the continuous deepening of research in optical and electronic communication, optical communication has developed rapidly.
  • optical transmission system In the optical transmission system
  • the external modulator is used to operate the laser in the continuous wave mode, which is simple and thorough to overcome the influence of the frequency ripple. In addition, it offers higher speeds, higher extinction ratios and greater power. Therefore, the external modulation technology is ideal for ultra-high speed, long-distance optical transmission.
  • Mach-Zehnder modulators among which mainly lithium niobate
  • LiNbio3 modulator The working principle of the lithium niobate modulator is described below.
  • the working principle of a lithium niobate modulator uses a characteristic that the refractive index of a particular material changes with the applied electric field to achieve a modulation function.
  • the applied electric field causes a change in the refractive index of the material.
  • the change in the refractive index causes a phase change of the modulated optical signal.
  • the phase change of the optical signal is combined with a specific lithium gallium silicate (MZ) interferometer to cause an interference effect on the output signal.
  • !0 is the modulation of optical power.
  • the characteristic curve of the lithium niobate modulator operation is shown in Figure 1.
  • the V coordinate represents the applied DC bias (Bias) voltage of the modulator. Different applied DC bias voltages correspond to different output optical powers.
  • the Bias voltage operates at various voltage points to achieve maximum output power (MAX), minimum (MIN), two Quad points (ie, Quad-, Quad+), and other optical power points.
  • the modulator when the light source is modulated by a high-speed non-return-to-zero (NRZ) code electrical signal, the modulator operates at two Quad points, with the lowest bit error rate for digital signal systems and minimal distortion for analog systems. Therefore, the voltage value of the applied DC bias voltage should be stabilized at Vpi/2 as much as possible to ensure that the optical power is stable at the Quad point, and the output optical modulation signal is optimal.
  • the Bias voltage at the Quad point of the lithium niobate modulator will drift due to temperature (ie, the Quad point DC voltage changes with temperature;), That is, the input voltage Vin does not guarantee that the optical power is always stable at the Quad point. Therefore, it is necessary to continuously compensate for the drift of the DC Bias voltage, so that the output value of the optical power is locked at the Quad point.
  • the prior art mainly uses the following two methods for bias control of the Bias voltage.
  • the first way is to use amplitude modulation bias control.
  • the principle of amplitude modulation bias control is to use high frequency data signals.
  • No. 5 performs amplitude modulation, and Bias voltage control is realized by calculating the feedback value of the feedback signal of the modulator.
  • the specific implementation process can be seen in Figure 2.
  • the low frequency disturbance signal (periodic sinusoidal signal) is loaded to achieve amplitude modulation of the RF at the amplitude modulation end of the amplitude driver.
  • the modulated signal that is, the PD response signal, is extracted by the backlight detection photodiode (PD).
  • the PD response signal is amplified, and frequency-selective filtering is performed on the frequency range of the low-frequency disturbance signal to obtain a PD response signal existing at a low-frequency disturbance frequency.
  • Vpp amplitude difference
  • the second way to add a low frequency disturbance signal is different from the first method, not by the amplitude modulation pin of the driver, but by the Bias end of the modulator.
  • the offset of the Bias voltage is determined by calculating the Vpp of the PD response signal at the disturbance frequency of the low frequency disturbance signal and the Vpp of the output signal at the second harmonic frequency of the low frequency, thereby obtaining a compensation value for the Bias voltage.
  • the inventors have found through research that: the first mode and the second mode in the prior art described above only implement the PD response signal and the low frequency disturbance in the process of calculating the Bias voltage compensation value.
  • Vpp can be accurately calculated to compensate for the Bias voltage.
  • both methods use multi-stage filtering and multi-stage amplification circuits, due to
  • the 5th-stage filtering and multi-stage amplifying circuits have different phase changes at different temperatures, which causes the synchronization between the PD response signal and the low-frequency disturbance signal, and the phase difference occurs, which causes the deviation of the Vpp to be calculated and the Bias voltage to be lowered. Control accuracy; If part of the amplifier circuit and filter circuit are removed to reduce the phase difference, the PD signal will be degraded. Therefore, the problem of the phase difference between the PD response signal and the low frequency disturbance signal always plagues the control accuracy of the Bias voltage. Summary of the invention
  • Embodiments of the present invention provide a phase adjustment method, apparatus, and optical modulator capable of operating a bias voltage and power of a light modulator at a stable operating point, thereby outputting a stable optical modulation signal.
  • Embodiments of the present invention provide a method for phase adjustment, including:
  • a characterization value is obtained by using all the sample values in each time slot, and a characterization difference between the two characterization values is obtained;
  • Embodiments of the present invention provide a phase adjustment apparatus, including:
  • a signal extracting unit configured to obtain a response signal including a low frequency disturbance signal, and obtain a response signal having a frequency of the low frequency disturbance signal according to the response signal;
  • a standard clock unit for dividing a standard clock period of a predetermined length into two equal time slots and providing a standard clock signal; wherein, when the response signal is synchronized with the standard clock, the two time slots are within the The response signal waveform is symmetrical;
  • a sampling unit configured to: in the time slot, the response signal of the low frequency disturbance signal frequency is sampled by the sampling clock; and obtaining the sample value of the response signal in the divided two time slots
  • An operation unit configured to obtain a characterization value by using all the sample values in each time slot, obtain a characterization difference between the two characterization values, and obtain an adjustment difference between the characterization difference value and a predetermined threshold value;
  • Embodiments of the present invention provide a light modulator, including:
  • An input device for inputting a low frequency disturbance signal and an RF signal into the light modulator; a photoelectric conversion device for obtaining a modulated optical response signal having a low frequency disturbance signal, and The optical response signal is converted into a response signal;
  • Phase adjustment device including:
  • a signal extracting unit configured to obtain, from the photoelectric conversion device, a response signal including a low frequency disturbance signal, and obtain a response signal having a frequency of the low frequency disturbance signal according to the response signal;
  • a standard clock unit for dividing a standard clock period of a predetermined length into two equal time slots and providing a standard clock signal; wherein, when the response signal is synchronized with the standard clock, the two time slots are The response signal waveform is symmetrical;
  • a sampling unit configured to: in the time slot, the response signal of the low frequency disturbance signal frequency is sampled by the sampling clock; and obtaining the sample value of the response signal in the divided two time slots 0 is an operation unit, configured to obtain a characterization value by using all the sample values in each time slot, obtain a characterization difference between the two characterization values, and obtain an adjustment difference between the characterization difference value and a predetermined threshold value; ;
  • An adjusting unit configured to move a phase of the low frequency disturbance signal by a corresponding angle according to the adjustment difference
  • a bias voltage control device configured to perform a synchronous 5 demodulation calculation by using the low frequency disturbance signal and the response signal, and use the calculation result to increase or decrease the bias voltage.
  • the method and apparatus in the embodiments of the present invention can adjust the phase difference between the low frequency disturbance signal and the response signal, keep the phase difference between the low frequency disturbance signal and the response signal constant, and the phase difference is not affected by the temperature and the device, and is reduced.
  • the cost of hardware design can perform synchronous demodulation calculation on the low frequency disturbance signal and the response signal, and use the calculation result to increase or decrease the bias of the !0 voltage, thereby improving the reliability of the lock bias voltage.
  • the bias voltage and power of the optical modulator are operated at a stable operating point to output a stable optical modulation signal.
  • FIG. 1 is a schematic diagram showing the characteristic curve of the operation of the lithium niobate modulator in the prior art
  • FIG. 2 is a schematic structural view of a lithium niobate modulator in the prior art
  • Figure 5 is a structural diagram of a modulator according to Embodiment 1 of the present invention.
  • FIG. 5 is a schematic diagram of a waveform when a standard signal and a response signal are synchronized in the first embodiment of the present invention
  • FIG. 6 is a schematic diagram showing a waveform of a response signal waveform deviating to the left in the first embodiment of the present invention
  • FIG. 7 is a first embodiment of the present invention
  • Figure 8 is a structural diagram of a device in Embodiment 2 of the present invention.
  • Figure 9 is a structural diagram of a light modulator in Embodiment 3 of the present invention.
  • a first embodiment of the present invention will be described in detail with reference to Figs. 3 and 4, see Fig. 3, in which the modulator uses an MZ type modulator, specifically a lithium niobate modulator.
  • the modulator uses an MZ type modulator, specifically a lithium niobate modulator.
  • an electrical signal is obtained by photoelectric conversion after the PD end, and after filtering and amplification, AD is sampled, the digital processing chip judges by using the sample value, and the low frequency disturbance signal is adjusted by the result of the judgment.
  • the specific actual process is shown in Figure 4, including the following steps:
  • Step 401 Obtain a response signal including a low frequency disturbance signal, and obtain a response signal having a frequency of the low frequency disturbance signal according to the response signal;
  • the optical response signal is obtained through the PD end of the modulator, and the optical response signal is photoelectrically converted to obtain a response signal, and the obtained response signal is filtered, and the filtering includes frequency selection, band pass, and filtering out the response signal having the frequency of the low frequency interference signal.
  • the frequency of the standard clock and the sample clock can be varied.
  • the standard clock is 1K
  • the sample clock is 20 ⁇ , that is, 20 times in the period of one standard clock signal.
  • Step 402 Divide a standard clock period of a predetermined length into two equal time slots, and sample the response signal in the time slot !0;
  • the predetermined length used may be one-half, or three-quarters of a standard clock cycle, or one standard clock cycle, or a plurality of standard clock cycles, and the like.
  • the response signal is sampled within a predetermined clock period of a predetermined length, it is necessary to divide the standard clock period of a predetermined length into two equal time slots, and the divided two time slots are not continuous.
  • the response signal waveforms in the two time slots are symmetric when the response signal is synchronized with the standard time of 5 minutes, which may be mirror symmetry or origin symmetry.
  • the standard clock cycle length used is one-half of the standard clock cycle length, and the length is divided into two consecutive and equal time slots.
  • FIG. 5 is a schematic diagram of the waveform when the standard clock and the response signal are synchronized
  • the square waveform in FIG. 5 is a standard clock signal waveform.
  • Party The wave is the signal time slot of the standard clock cycle
  • the curve waveform is the waveform of the response signal.
  • the forward direction of the response signal i.e., the upper half axis in Fig. 5
  • the negative direction i.e., the lower half axis in Fig. 5
  • the sample values are obtained 10 times, and the sample values in the two time slots are separately counted.
  • Step 403 Record the obtained sample values in an array
  • Step 404 Determine whether the number of times of each sample is less than the maximum number of samples
  • Step 405 Calculate the characterization values of the response signals in the two time slots respectively.
  • the calculation process is to perform the sum, difference, product, logarithm, and integral of all the sample values in each time slot. Or a combination of operations.
  • the sum values are summed to obtain the characterization values of the respective time slots.
  • the characterization value is obtained as SUMA.
  • the negative ⁇ sample value can be obtained. Since the response signal is in the negative direction, the obtained ⁇ sample value is summed. After the operation, the characterization value is obtained, which is recorded as SUMB and is negative.
  • step 407 if less, step 408;
  • the predetermined threshold is a characterization difference obtained according to the divided time slots when the response signal is synchronized with the standard clock.
  • the predetermined threshold value is related to the waveform of the response signal in the time slot. If the waveform of the response signal is divided into left and right symmetry when dividing the time slot, the difference value represented by subtracting the two time slots is The threshold is 0; if the time slot is divided, the waveform of the response signal is the origin Symmetrical, the characterization difference after subtracting through two time slots is not zero.
  • the divided two time slots are equal, the number of times of each time slot is the same, and the response signal waveforms in the two time slots are mirror symmetrical, so the predetermined threshold is zero.
  • the response signal is just in the time slot to the left of the standard clock.
  • the value of SUMB is a negative value. 5
  • the result of subtracting SUMB with SUMA is recorded as SUMC, and the value is subtracted by positive value.
  • the result of the negative value must be a positive value greater than the threshold 0, indicating that the phase of the low frequency disturbance signal is offset to the right relative to the phase of the standard clock.
  • Step 407 Offset the phase of the low frequency disturbance clock to the left by a corresponding degree
  • the obtained adjustment difference value SUMC corresponds to the phase difference of the response signal of the left part of the standard clock signal is 45 degrees
  • the phase of the low frequency disturbance signal is shifted to the left by 45 degrees
  • the degree of the phase is Reduce it by 45 degrees.
  • Step 408 Determine whether the difference between the two representative values is less than a predetermined threshold. If it is less than 5, perform step 409; otherwise, indicate that no phase offset occurs, end the adjustment or re-execute step 401.
  • FIG. 7 a waveform diagram as shown in Fig. 7 appears.
  • the response signal of the standard clock waveform ie, square wave
  • the sample result SUMA is a negative value
  • the sampling result of the response signal in the shaded area is recorded as SUMB
  • the SUMB is obtained as a positive value.
  • SUMA minus SUMB results SUMC is a negative !0 value that must be less than the threshold 0.
  • Step 409 Offset the phase of the low frequency disturbance clock to the right by a corresponding degree.
  • the adjustment difference between the characteristic difference value and the predetermined threshold value needs to be obtained, and the corresponding degree is moved by adjusting the difference value.
  • the corresponding phase degree can be obtained according to the obtained difference SUMC, and the phase of the !5 low frequency disturbance signal is increased by the corresponding degree, so that the waveform of the low frequency disturbance signal is shifted to the right.
  • the phase adjustment apparatus includes: a signal extraction unit 801. , a standard clock unit 802, a sample unit 803, an operation unit 804, a determination unit 805, and an adjustment unit 806, wherein:
  • a signal extraction unit 801 configured to obtain a response signal including a low frequency disturbance signal, and obtain a response signal having a frequency of the low frequency disturbance signal according to the response signal;
  • a standard clock unit 802 configured to divide a standard clock period of a predetermined length into two equal time slots and provide a standard clock signal; wherein, when the response signal is synchronized with the standard clock, the two time slots are The response signal waveform is symmetrical;
  • a sampling unit 803 configured to: in the time slot, the response signal of the low frequency disturbance signal frequency is sampled by the sampling clock; and acquiring the response signal in the divided two time slots
  • the calculation unit 804 is configured to obtain a characterization value by using all the sample values in each time slot, obtain a characterization difference between the two characterization values, and obtain an adjustment between the characterization difference value and a predetermined threshold value. Difference
  • the determining unit 805 is configured to determine whether the adjusted difference exceeds a predetermined threshold, and obtain a judgment knot
  • the adjusting unit 806 moves the phase of the low frequency disturbance signal by a corresponding angle according to the determination result and the adjustment difference.
  • the process by which the operation unit 804 obtains the characterization value by using all the sample values in each time slot includes:
  • the adjusting unit 806 includes:
  • a first adjusting unit 807 configured to: when the determining result is that the difference is greater than the predetermined threshold, reduce a phase of the low frequency disturbance signal by a corresponding angle according to the difference;
  • the second adjustment unit 808 is configured to increase the phase of the low frequency disturbance signal by a corresponding angle according to the difference when the determination result is that the adjustment difference is less than the threshold.
  • the functions of the determining unit 805 and the adjusting unit 806 can be integrated into one unit in practical applications.
  • the method and apparatus in embodiments of the present invention are capable of adjusting between a low frequency disturbance signal and a response signal
  • the phase difference keeps the phase difference between the low frequency disturbance signal and the response signal synchronized.
  • the characterization value can be obtained in a variety of ways, the calculation method is flexible, easy to implement, and the phase difference control precision is accurate.
  • FIG. 9 is a structural diagram of a light modulator including an input device 901, a bias voltage control device 902, and a phase.
  • the adjusting device 903, the photoelectric conversion device 904, wherein the light modulator may be an MZ modulator.
  • An input device 901 configured to input a low frequency disturbance signal and an RF signal into the light modulator; 0 a photoelectric conversion device 904, configured to obtain a modulated optical response signal having a low frequency disturbance signal, and convert the optical response signal into a response Signal
  • the phase adjustment device 903 includes: a signal extraction unit 905, a standard clock unit 906, a sample unit 907, an operation unit 908, a determination unit 909, and an adjustment unit 910;
  • a signal extracting unit 905 configured to obtain, from the photoelectric conversion device 904, a response signal including the low frequency disturbance signal 5, and obtain a response signal having a frequency of the low frequency disturbance signal according to the response signal;
  • a standard clock unit 906 configured to divide a standard clock period of a predetermined length into two equal time slots and provide a standard clock signal; wherein, when the response signal is synchronized with the standard clock, the two time slots are The response signal waveform is symmetrical;
  • a sampling unit 907 configured to: in the time slot, the response signal of the low frequency disturbance signal frequency !0 is sampled by the sampling clock; in the divided two time slots, acquiring the response signal
  • the operation unit 908 is configured to obtain a characterization value by using all the sample values in each time slot, obtain a characterization difference between the two characterization values, and obtain a relationship between the characterization difference value and a predetermined threshold value. Adjust the difference;
  • the determining unit 909 is configured to determine whether the adjusted difference exceeds a predetermined threshold, and obtain a judgment result
  • the bias voltage control device 902 is configured to increase or decrease the bias voltage by using the calculation result by performing synchronous demodulation calculation on the low frequency disturbance signal and the response signal.
  • the adjusting unit 910 includes: a first adjusting unit 911, configured to: when the determining result is that the adjustment difference is greater than the predetermined threshold, reduce a phase of the low frequency disturbance signal by a corresponding angle according to the difference;
  • the second adjusting unit 912 is configured to: when the determining result is that the adjustment difference is less than the predetermined threshold, increase a phase of the low frequency disturbance signal by a corresponding angle according to the difference.
  • the functions of the determining unit 805 and the adjusting unit 806 can be integrated into one unit in practical applications.
  • the phase difference can be adjusted without interruption; a control switch can also be added to perform the operation of adjusting the phase difference when the bias voltage is not stable.
  • the optical modulator in the embodiment of the invention can calculate the low frequency disturbance signal and the response signal, and use the calculation result to increase or decrease the bias voltage, so that the bias voltage and power of the light modulator operate at a stable working point, so that the output is stable.
  • Optical modulation signal can be calculated.
  • the calculation process of the bias voltage control device can be implemented in various existing ways, such as calculating the deviation value of the bias voltage by the amplitude relationship of the low frequency disturbance signal and the response signal; The technique of calculating the deviation value of the bias voltage when the voltage is operated at MAX or MIN as shown in FIG. 1 to perform corresponding adjustment. These techniques can be phase controlled by the scheme in the embodiment of the present invention to achieve relatively stable control of the bias voltage.

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

Abstract

L'invention concerne un procédé d'ajustement de phase qui consiste à obtenir un signal de réponse incluant un signal de perturbation basse fréquence; obtenir un signal de réponse avec la fréquence du signal de perturbation basse fréquence conformément au signal de réponse; diviser une période d'horloge standard de longueur prédéterminée en deux intervalles égaux, et avec une horloge d'échantillonnage, l'échantillonnage du signal de réponse avec la fréquence du signal de perturbation basse fréquence dans les intervalles; dans les deux intervalles divisés, obtenir la valeur d'échantillonnage du signal de réponse; obtenir une valeur caractéristique par utilisation de toutes les valeurs d'échantillonnage dans chaque intervalle et obtenir une valeur de différence caractéristique entre deux valeurs caractéristiques; obtenir une valeur de différence d'ajustement entre la valeur de différence caractéristique et un seuil prédéterminé; décaler la phase du signal de perturbation basse fréquence par un angle correspondant conformément à la valeur de différence d'ajustement afin de maintenir constante la différence de phase entre le signal de perturbation basse fréquence et le signal de réponse. Cette invention concerne aussi un appareil et un modulateur optique pour un ajustement de phase.
PCT/CN2008/071642 2007-07-16 2008-07-15 Procédé, appareil et modulateur optique pour ajustement de phase WO2009010007A1 (fr)

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CN 200710135834 CN101350674B (zh) 2007-07-16 2007-07-16 一种相位调整的方法、装置及光调制器
CN200710135834.3 2007-07-16

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CN101794001B (zh) * 2010-01-22 2012-04-04 苏州旭创科技有限公司 一种新型射频模拟sfp模块的设计方法
CN101808063B (zh) * 2010-03-30 2014-01-01 中兴通讯股份有限公司 一种控制调制器相位延迟偏置点的方法及装置
WO2011100929A2 (fr) * 2011-04-14 2011-08-25 华为技术有限公司 Procédé et système de modulation optique
CN108345554B (zh) * 2017-01-22 2020-08-21 联发科技股份有限公司 决定出取样时脉信号的取样相位的方法及相关的电子装置
CN109257103A (zh) * 2018-09-30 2019-01-22 武汉联特科技有限公司 一种m-z调制器工作点稳定的控制方法及***
CN112887010B (zh) * 2021-01-22 2022-07-19 中国人民解放军国防科技大学 一种星间链路信号级协同通信方法、装置和计算机设备

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