WO2012100543A1 - 一种提高眼图交叉点稳定性的控制装置及方法 - Google Patents

一种提高眼图交叉点稳定性的控制装置及方法 Download PDF

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Publication number
WO2012100543A1
WO2012100543A1 PCT/CN2011/079664 CN2011079664W WO2012100543A1 WO 2012100543 A1 WO2012100543 A1 WO 2012100543A1 CN 2011079664 W CN2011079664 W CN 2011079664W WO 2012100543 A1 WO2012100543 A1 WO 2012100543A1
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Prior art keywords
voltage
temperature
intersection
reference voltage
control device
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PCT/CN2011/079664
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English (en)
French (fr)
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战永兴
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中兴通讯股份有限公司
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Publication of WO2012100543A1 publication Critical patent/WO2012100543A1/zh

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Classifications

    • 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
    • H04B10/504—Laser transmitters using direct modulation
    • 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 
    • G02F1/17—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  based on variable-absorption elements not provided for in groups G02F1/015 - G02F1/169
    • G02F1/174—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  based on variable-absorption elements not provided for in groups G02F1/015 - G02F1/169 based on absorption band-shift, e.g. Stark - or Franz-Keldysh effect

Definitions

  • the optical transceiver module has been widely used in optical fiber communication systems.
  • the optical transceiver module is mainly used for electrical/optical, optical/electrical conversion, and is a fiber-optic communication system.
  • One of the key technologies its performance has an important impact on the performance of fiber-optic communication systems.
  • the customer-side optical transceiver module in a fiber-optic communication system with a speed of 40G or more usually uses an Electro-absorption Modulated Laser (EML) device (this device is a combination of an electroabsorption modulation laser and a driver or Electro-absorption modulated laser including driver) Completes the conversion of electricity to light.
  • EML Electro-absorption Modulated Laser
  • the optical eye diagram of the laser such as the extinction ratio and intersection, directly affects the distance and error rate of the signal transmitted in the optical fiber. Overall performance plays a very important role.
  • lasers with 40G and 40G speeds have larger eye diagram jitter and less eyeflow.
  • the intersections are susceptible to drift due to temperature or power supply voltage fluctuations and laser internal resistance changes.
  • the change of the position of the point causes the duty cycle of the signal to change, the jitter increases, and the sample points on the eye diagram are more likely to fall into the eye pattern template, resulting in an increase in the bit error rate.
  • the technical problem to be solved by the present invention is to provide a control device for improving the stability of the eye intersection, which improves the stability of the eye intersection.
  • the present invention provides a control device for improving the stability of an eye diagram intersection;
  • the control device includes a cross point control module;
  • the intersection control module includes a voltage setting unit and a feedback control unit;
  • the voltage setting unit is configured to: set a reference voltage;
  • the feedback control unit is configured to: correspond to an intersection of an intersection of the electroabsorption modulation laser output eye diagram
  • the above control device may also have the following features:
  • the voltage setting unit is configured to: set a voltage corresponding to a desired intersection stable position as an initial reference voltage.
  • control device may also have the following features:
  • the control device further includes a temperature compensation module; the temperature compensation module is configured to: determine a compensation voltage amount relative to the initial reference voltage according to detecting a temperature of the electroabsorption modulation laser and input the voltage to the voltage setting unit; The voltage setting unit is further configured to: adjust the current reference voltage according to the compensation voltage amount.
  • control device may also have the following features:
  • the temperature compensation module includes a temperature detecting unit and a voltage control unit; the temperature detecting and converting unit is configured to: send a voltage amount corresponding to a temperature of the electroabsorption modulation laser to the voltage control unit; And: calculating a temperature of the electroabsorption modulation laser according to the voltage amount and calculating a compensation voltage amount relative to the initial reference voltage according to the temperature of the electroabsorption modulation laser.
  • control device may also have the following features:
  • the electroabsorption modulation laser is an electroabsorption modulation laser having a rate of 40 G or more.
  • the present invention also provides a method for improving the stability of an eye diagram intersection, comprising: setting a reference voltage; and performing feedback control on a crosspoint voltage corresponding to an intersection of an electroabsorption modulation laser output eye diagram The difference between the intersection voltage and the reference voltage is within a preset range.
  • the above method may also have the following features:
  • a compensation voltage amount relative to the initial reference voltage is determined according to detecting a temperature of the electroabsorption modulation laser; and a current reference voltage is adjusted according to the compensation voltage amount.
  • the above method may also have the following features:
  • Determining the amount of compensation voltage relative to the initial reference voltage based on detecting the temperature of the electroabsorption modulation laser includes: determining a voltage amount corresponding to a temperature of the electroabsorption modulation laser, calculating a temperature of the electroabsorption modulation laser according to the voltage amount, and calculating the temperature according to the voltage The temperature of the absorption modulated laser calculates the amount of compensation voltage relative to the initial reference voltage.
  • the drift of the intersection of the electro-absorption modulation laser can be suppressed, the jitter performance of the optical eye diagram can be improved, and the error rate of the transmitting end of the module can be reduced, thereby improving the overall performance of the optical transceiver module.
  • FIG. 1 is a structural diagram of a control device for improving stability of an eye intersection in an embodiment
  • FIG. 2 is a structural diagram of a control device for improving the stability of an eye intersection in the first embodiment
  • FIG. 3 is a structural diagram of a control device for improving the stability of an eye intersection in the second embodiment
  • FIG. 4 is a cross-point temperature compensation curve. ;
  • Fig. 5 is a graph showing the relationship between the intersection control voltage Vx and the intersection Xp.
  • the control device for improving the stability of the eye intersection includes a cross point control module; the cross point control module includes a voltage setting unit and a feedback control unit.
  • This control device can be implemented by a Field Programmable Gate Array (FPGA).
  • FPGA Field Programmable Gate Array
  • the voltage setting unit is used to set the reference voltage.
  • the feedback control unit is used to correspond to the intersection of the intersection of the electroabsorption modulation laser output eye diagram
  • the feedback control unit can control the preset range through the error controller, and the feedback control unit controls the intersection voltage to approach the reference voltage.
  • the electroabsorption modulation laser in the present invention is an electroabsorption modulation laser having a rate of 40 G or more.
  • the voltage setting unit sets the voltage corresponding to the desired intersection stable position as the initial reference voltage.
  • the voltage setting unit can be composed of a digital potentiometer of 8-12 bits and a resistor divider network.
  • the feedback control unit performs feedback control on the intersection voltage Vx of the electroabsorption modulation laser.
  • the difference between the intersection voltage and the reference voltage is within a preset range, and the intersection voltage is corrected to stabilize the intersection voltage, thereby stabilizing the position of the intersection.
  • the feedback control unit includes an error controller, a controllable current source, and a current-voltage converter connected in sequence; and a feedback circuit connected between the controllable current source and the inverting input terminal of the error controller;
  • the positive input of the error controller is used for the input voltage
  • the controllable current source of the lower stage is controlled by the difference of the output.
  • the error controller can be implemented using an integrated op amp circuit.
  • the controllable current source is responsible for outputting the corresponding drive current according to the difference of the output of the previous stage.
  • This controllable current source can consist of a triode or a MOS transistor.
  • the current-to-voltage converter is responsible for converting the amount of current output by the current source into a voltage amount.
  • the feedback circuit is responsible for inputting the feedback value collected via the current-voltage converter and the controllable current source to the inverting input of the error controller.
  • the feedback circuit can be composed of resistors and capacitors. By changing the parameters of the resistors and capacitors, the control accuracy and response speed can be improved.
  • the feedback circuit integrates the changed cross-point voltage Vx caused by the fluctuation of the power supply or internal resistance of the laser to the inverting input of the error controller.
  • the difference between the voltages is used as a control amount to control the output of the controllable current source, and the controllable current amount is output.
  • the current-voltage converter converts the controllable current amount into a voltage amount for controlling the cross-point voltage Vx, and finally makes the cross-point voltage Vx. Stabilizes within a preset range of the reference voltage to stabilize the intersection position.
  • the control device in the second embodiment further includes a temperature compensation module.
  • the temperature compensation module is configured to determine a compensation voltage amount with respect to the initial reference voltage according to the detected ambient temperature and input to the voltage setting unit.
  • the voltage setting unit sets a voltage corresponding to the desired intersection stable position as an initial reference voltage, and adjusts the current reference voltage according to the compensation voltage amount.
  • the voltage setting unit can be composed of 8-12 digit digital potentiometer and resistor divider network.
  • the temperature of the electro-absorption modulation laser ie, the temperature of the laser housing
  • the temperature in the present invention adjusts the current reference voltage according to the compensation voltage amount provided by the temperature compensation module, and the feedback control unit performs feedback control so that the difference between the intersection voltage and the current reference voltage is within a preset range, and the intersection voltage is corrected. , compensates for the positional drift of the intersection, thereby stabilizing the position of the intersection.
  • the temperature compensation module includes a temperature detection unit and a voltage control unit.
  • the temperature detecting and converting unit is for using a voltage amount corresponding to the temperature of the electroabsorption modulation laser
  • V T is sent to the voltage control unit.
  • the amount of voltage V T output by the temperature detecting and converting unit varies with the temperature of the laser housing.
  • the voltage control unit is configured to calculate the temperature of the electroabsorption modulation laser according to the voltage amount ⁇ ⁇ output by the temperature detection and conversion unit, and calculate the compensation voltage amount with respect to the initial reference voltage according to the temperature of the electroabsorption modulation laser.
  • the voltage control unit calculates the housing temperature Tc of the electroabsorption modulated laser according to V T according to the following formula:
  • Tl is a parameter indicating the ambient temperature, which can be manually set (for example, set to 25 degrees)
  • VI The voltage value calculated by the temperature detecting and converting unit when the laser temperature is T1.
  • a is a fixed coefficient inherent to the temperature detection and conversion unit.
  • the compensation algorithm used in the voltage control unit is represented by the following equation:
  • ⁇ is the compensation coefficient (this coefficient can be used empirical value)
  • ⁇ is the compensation coefficient (this coefficient can be used empirical value)
  • ⁇ is the compensation coefficient (this coefficient can be used empirical value)
  • the voltage control unit When a digital potentiometer is used in the voltage setting unit, the voltage control unit outputs an integer value according to the following formula
  • K is the step factor of the digital potentiometer.
  • the temperature of the electroabsorption modulation laser ie, the temperature of the laser housing
  • the temperature detection and The conversion unit detects the output voltage amount V T corresponding to the temperature of the electroabsorption modulation laser
  • the voltage control unit calculates Tc, and further calculates the adjustment value N of the digital potentiometer in the voltage setting unit, and the voltage setting unit performs corresponding
  • the feedback control unit controls the intersection voltage Vx according to the adjusted voltage output from the voltage setting unit, so that the change of the intersection voltage Vx compensates for the change of the laser temperature, thereby stabilizing the intersection position.
  • the correspondence between the laser temperature Tc and the cross-point voltage Vx during the temperature compensation process is shown in the cross-point temperature compensation curve shown in Fig. 4.
  • Fig. 5 the relationship between the change in the cross-point voltage in the present invention and the influence of the position of the intersection is shown.
  • the present invention can stabilize the amount of change in the eye intersection of the laser from a temperature range of -5 to 80 degrees within 1%.
  • the method for improving the stability of the eye intersection includes: setting a reference voltage; performing feedback control on the intersection voltage corresponding to the intersection of the output patterns of the electroabsorption modulation laser, so that the difference between the intersection voltage and the reference voltage is preset Within the scope.
  • Performing feedback control on the intersection voltage of the electroabsorption modulation laser such that when the difference between the intersection voltage and the reference voltage is within a preset range specifically, determining the relative reference voltage according to the temperature of the detection electro-absorption modulation laser The amount of compensation voltage; adjusting the current reference voltage according to the amount of compensation voltage.
  • Determining the amount of the compensation voltage relative to the initial reference voltage according to detecting the temperature of the electroabsorption modulation laser specifically includes: determining a voltage amount corresponding to a temperature of the electroabsorption modulation laser, calculating a temperature of the electroabsorption modulation laser according to the voltage amount, and according to the voltage amount The temperature of the electroabsorption modulated laser calculates the amount of compensation voltage relative to the initial reference voltage.
  • the present invention can further improve the eye image margin and reduce the bit error rate.
  • the features in the embodiments and the embodiments of the present application may be arbitrarily combined with each other without conflict. It is a matter of course that the invention may be embodied in various other forms and modifications without departing from the spirit and scope of the invention.
  • One of ordinary skill in the art will appreciate that all or a portion of the above steps may be accomplished by a program instructing the associated hardware, such as a read-only memory, a magnetic disk, or an optical disk. Alternatively, all or part of the steps of the above embodiments may also be implemented using one or more integrated circuits.
  • each module/unit in the above embodiment may be implemented in the form of hardware or in the form of a software function module. The invention is not limited to any specific form of combination of hardware and software.
  • the feedback control of the laser cross-point voltage can suppress the drift of the intersection of the electro-absorption modulation laser, improve the jitter performance of the optical eye diagram, and reduce the bit error rate of the transmitting end of the module, thereby improving the optical transceiver module. Overall performance.

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

Abstract

一种提高眼图交叉点稳定性的控制装置及方法。所述控制装置包括交叉点控制模块；所述交叉点控制模块包括电压设定单元和反馈控制单元；所述电压设定单元设置为：设定参考电压；所述反馈控制单元设置为：对电吸收调制激光器输出眼图的交叉点对应的交叉点电压进行反馈控制使交叉点电压与所述参考电压的差值在预设范围内。本发明通过对激光器交叉点电压的反馈控制，可以抑制电吸收调制激光器交叉点的漂移，改善出光眼图抖动性能，降低模块发送端的误码率，从而提升光收发合一模块的整体性能。

Description

一种提高眼图交叉点稳定性的控制装置及方法
技术领域
本发明涉及数字光纤传输系统技术领域， 尤其涉及一种提高眼图交叉点 稳定性的控制装置及方法。
背景技术
随着光通信技术的不断发展， 光收发合一模块已经越来越广泛地应用到 光纤通讯系统中， 光收发合一模块主要用于进行电 /光、 光 /电转换， 是光纤通 讯系统的关键技术之一， 其性能对光纤通讯系统性能指标有着重要影响。 速 率为 40G或 40G以上的光纤通讯系统中的客户侧光收发合一模块通常使用电 吸收调制激光器（Electro-absorption Modulated Laser, 简称 EML )装置 （此 装置为电吸收调制激光器与驱动器的组合装置或者包含驱动器的电吸收调制 激光器） 完成电到光的转换， 激光器的光眼图指标， 如消光比、 交叉点等直 接影响信号在光纤中传输的距离和误码率， 对光收发合一模块的整体性能起 着非常重要的作用。
40G及 40G以上速率的激光器相比 10G速率的激光器其眼图抖动较大， 眼图裕量较小， 交叉点容易受温度或电源电压波动及激光器内阻变化等因素 影响而发生漂移， 同时交叉点的位置改变会造成信号占空比改变， 抖动增大， 眼图上的釆样点更容易落进眼图模板中， 最终造成误码率升高。 发明内容
本发明要解决的技术问题是提供一种提高眼图交叉点稳定性的控制装 置， 提高眼图交叉点稳定性。
为了解决上述技术问题， 本发明提供了一种提高眼图交叉点稳定性的控 制装置； 所述控制装置包括交叉点控制模块； 所述交叉点控制模块包括电压 设定单元和反馈控制单元； 所述电压设定单元设置为： 设定参考电压； 所述 反馈控制单元设置为： 对电吸收调制激光器输出眼图的交叉点对应的交叉点 优选地， 上述控制装置还可以具有以下特点：
所述电压设定单元设置为： 将期望的交叉点稳定位置对应的电压设定为 初始参考电压。
优选地， 上述控制装置还可以具有以下特点：
所述控制装置还包括温度补偿模块； 所述温度补偿模块设置为： 根据检 测电吸收调制激光器的温度确定相对于所述初始参考电压的补偿电压量并输 入至所述电压设定单元； 所述电压设定单元还设置为： 根据所述补偿电压量 调整当前的参考电压。
优选地， 上述控制装置还可以具有以下特点：
所述温度补偿模块包括温度检测单元和电压控制单元； 所述温度检测及 转换单元设置为： 将与电吸收调制激光器的温度对应的电压量发送至所述电 压控制单元； 所述电压控制单元设置为： 根据所述电压量计算电吸收调制激 光器的温度并根据电吸收调制激光器的温度计算相对于所述初始参考电压的 补偿电压量。
优选地， 上述控制装置还可以具有以下特点：
所述反馈控制单元包括依次相连的误差控制器、 可控电流源、 电流电压 变换器； 还包括连接在可控电流源和误差控制器的反向输入端之间的反馈电 优选地， 上述控制装置还可以具有以下特点：
所述电吸收调制激光器为速率为 40G或 40G以上的电吸收调制激光器。 为了解决上述技术问题， 本发明还提供了一种提高眼图交叉点稳定性的 方法， 包括： 设定参考电压； 对电吸收调制激光器输出眼图的交叉点对应的 交叉点电压进行反馈控制使交叉点电压与所述参考电压的差值在预设范围 内。
优选地， 上述方法还可以具有以下特点：
将期望的交叉点稳定位置对应的电压设定为初始参考电压。 优选地， 上述方法还可以具有以下特点：
根据检测电吸收调制激光器的温度确定相对于所述初始参考电压的补偿 电压量； 根据所述补偿电压量调整当前的参考电压。
优选地， 上述方法还可以具有以下特点：
根据检测电吸收调制激光器的温度确定相对于所述初始参考电压的补偿 电压量包括： 确定与电吸收调制激光器的温度对应的电压量， 根据所述电压 量计算电吸收调制激光器的温度并根据电吸收调制激光器的温度计算相对于 所述初始参考电压的补偿电压量。
本发明实施例通过对激光器交叉点电压的反馈控制， 可以抑制电吸收调 制激光器交叉点的漂移， 改善出光眼图抖动性能， 降低模块发送端的误码率， 从而提升光收发合一模块的整体性能。 附图概述
图 1是实施例中提高眼图交叉点稳定性的控制装置的结构图；
图 2是实施例一中提高眼图交叉点稳定性的控制装置的结构图； 图 3是实施例二中提高眼图交叉点稳定性的控制装置的结构图； 图 4是交叉点温度补偿曲线；
图 5是交叉点控制电压 Vx与交叉点 Xp关系曲线。 本发明的较佳实施方式
提高眼图交叉点稳定性的控制装置包括交叉点控制模块;交叉点控制模 块包括电压设定单元和反馈控制单元。 此控制装置可由现场可编程门阵列 ( Field Programmable Gate Array, FPGA ) 实现。
电压设定单元用于设定参考电压。
反馈控制单元用于对电吸收调制激光器输出眼图的交叉点对应的交叉点 反馈控制单元可通过误差控制器实现对预设范围的控制， 反馈控制单元 控制交叉点电压趋近于参考电压。
本发明中的电吸收调制激光器为速率为 40G或 40G以上的电吸收调制激 光器。
实施例一
在实施例一中， 电压设定单元将期望的交叉点稳定位置对应的电压设定 为初始参考电压。 根据控制精度需要电压设定单元可釆用 8-12位的数字电位 器和电阻分压网络组成。
激光器内供电电源或是内阻的指数产生波动从而影响交叉点电压 Vx发 生变化进而影响交叉点的位置产生漂移时， 本发明中反馈控制单元对电吸收 调制激光器的交叉点电压 Vx进行反馈控制使交叉点电压与所述参考电压的 差值在预设范围内， 对交叉点电压进行修正， 使交叉点电压稳定， 从而使交 叉点的位置稳定。
如图 2所示， 反馈控制单元包括依次相连的误差控制器、 可控电流源、 电流电压变换器； 还包括连接在可控电流源和误差控制器的反向输入端之间 的反馈电路； 误差控制器的正向输入端用于输入电压
压。
误差控制 <L
值进行比较后， 通过输出的差量控制下级的可控电流源。 误差控制器可釆用 集成运放电路来实现。
可控电流源负责根据前级输出的差量大小输出相应的驱动电流。 此可控 电流源可由三极管或 MOS管组成。
电流电压变换器负责将电流源输出的电流量转换成电压量。
反馈电路负责将经由电流电压变换器和可控电流源釆集到的反馈值输入 到误差控制器的反向输入端。 反馈电路可以电阻电容组成， 通过改变电阻和 电容的参数， 可以改善控制精度和响应速度。
在图 2所示结构下， 反馈电路将因激光器内供电电源或是内阻的指数产 生波动导致的变化后的交叉点电压 Vx釆集到误差控制器的反向输入端 ,误差 电压的差值作为一个控制量控制可控电流源的输出， 输出可控电流量， 电流 电压转换器将可控电流量转换为用于控制交叉点电压 Vx的电压量，最终使交 叉点电压 Vx稳定在距离参考电压的预设范围内， 从而稳定交叉点位置。
实施例二
实施例二中控制装置还包括温度补偿模块。
温度补偿模块用于根据检测到的环境温度确定相对于初始参考电压的补 偿电压量并输入至电压设定单元。
电压设定单元将期望的交叉点稳定位置对应的电压设定为初始参考电 压， 并根据所述补偿电压量调整当前的参考电压。 根据控制精度需要电压设 定单元可釆用 8-12位的数字电位器和电阻分压网络组成。
实施例二中， 环境温度发生变化时导致电吸收调制激光器的温度（即激 光器壳体的温度）相应发生变化， 导致交叉点的位置产生漂移但交叉点电压 Vx保持不变时，本发明中电压设定单元根据温度补偿模块提供的补偿电压量 调整当前的参考电压， 反馈控制单元进行反馈控制使交叉点电压与所述当前 的参考电压的差值在预设范围内， 对交叉点电压进行修正， 补偿交叉点的位 置漂移， 从而使交叉点的位置稳定。
如图 3所示， 实施例二中反馈控制单元的结构与实施例一中相同。 温度 补偿模块包括温度检测单元和电压控制单元。
温度检测及转换单元用于将与电吸收调制激光器的温度对应的电压量
VT发送至电压控制单元。 温度检测及转换单元输出的电压量 VT随激光器壳 体的温度变化而变化。
电压控制单元用于根据温度检测及转换单元输出的电压量 ντ计算电吸 收调制激光器的温度， 并根据电吸收调制激光器的温度计算相对于所述初始 参考电压的补偿电压量。
电压控制单元根据下式根据 VT计算电吸收调制激光器的壳体温度 Tc:
Figure imgf000007_0001
其中， Tl为表示环境温度的参数， 可人工设置 （例如设为 25度） ， VI 为当激光器温度为 T1时温度检测及转换单元计算得到的电压值。 a为温度检 测及转换单元固有的固定系数。
电压控制单元中使用的补偿算法由下式表示：
其中， ξ为补偿系数（此系数可使用经验值） ， Τ。为表示位于常温下的 激光器的壳体温度的参数， 可人工设置， Vx@TQ表示当激光器的温度为 T0 时的电压 Vx的值。
Vx 电压随温度变化的偏移量为： AVx=Vx-Vx@TQ= Tc-TQ;)。 为了补偿 激光器温度变化对交叉点位置的影响， 需补偿的电压量为 AVx。
电压设定单元中使用数字电位器时， 电压控制单元根据下式输出整数值
Ν作为补偿电压量控制此数字电位器：
Figure imgf000008_0002
其中， K为数字电位器的步进系数。
如图 3所示， 环境温度发生变化时导致电吸收调制激光器的温度（即激 光器壳体的温度）相应发生变化， 导致交叉点的位置产生漂移但交叉点电压 Vx保持不变时，温度检测及转换单元通过检测输出与电吸收调制激光器的温 度对应的电压量 VT, 电压控制单元计算得到 Tc,并进一步计算出电压设定单 元中数字电位器的调整值 N, 电压设定单元进行相应的电压调整， 反馈控制 单元根据电压设定单元输出的调整后的电压控制交叉点电压 Vx,使交叉点电 压 Vx的变化补偿激光器温度的改变， 从而稳定交叉点位置。
如图 4所示的交叉点温度补偿曲线中表示了在进行温度补偿过程中激光 器温度 Tc与交叉点电压 Vx的对应关系。 如图 5所示是本发明中交叉点电压 的变化对交叉点位置影响的关系。 通过图 4和图 5可知， 釆用本发明可将激 光器从 -5度〜 80度温度范围内的眼图交叉点变化量稳定在 1%以内。
提高眼图交叉点稳定性的方法包括： 设定参考电压； 对电吸收调制激光 器输出眼图的交叉点对应的交叉点电压进行反馈控制使交叉点电压与所述参 考电压的差值在预设范围内。
设定参考电压时， 将期望的交叉点稳定位置对应的电压设定为初始参考 电压。
对电吸收调制激光器的交叉点电压进行反馈控制使交叉点电压与所述参 考电压的差值在预设范围内时， 具体的， 根据检测电吸收调制激光器的温度 确定相对于所述初始参考电压的补偿电压量； 根据所述补偿电压量调整当前 的参考电压。
根据检测电吸收调制激光器的温度确定相对于所述初始参考电压的补偿 电压量具体包括： 确定与电吸收调制激光器的温度对应的电压量， 根据所述 电压量计算电吸收调制激光器的温度并根据电吸收调制激光器的温度计算相 对于所述初始参考电压的补偿电压量。
本方法中具体的实现过程与上述装置描述中对应相同。
本发明通过稳定交叉点位置， 可以进一步提高眼图裕量， 降低误码率。 需要说明的是， 在不冲突的情况下， 本申请中的实施例及实施例中的特 征可以相互任意组合。 当然， 本发明还可有其他多种实施例， 在不背离本发明精神及其实质的 但这些相应的改变和变形都应属于本发明所附的权利要求的保护范围。 本领域普通技术人员可以理解上述方法中的全部或部分步骤可通过程序 来指令相关硬件完成， 所述程序可以存储于计算机可读存储介质中， 如只读 存储器、 磁盘或光盘等。 可选地， 上述实施例的全部或部分步骤也可以使用 一个或多个集成电路来实现。 相应地， 上述实施例中的各模块 /单元可以釆用 硬件的形式实现， 也可以釆用软件功能模块的形式实现。 本发明不限制于任 何特定形式的硬件和软件的结合。
工业实用性 本发明实施例通过对激光器交叉点电压的反馈控制， 可以抑制电吸收调 制激光器交叉点的漂移， 改善出光眼图抖动性能， 降低模块发送端的误码率， 从而提升光收发合一模块的整体性能。

Claims

权 利 要 求 书
1、 一种提高眼图交叉点稳定性的控制装置，
所述控制装置包括交叉点控制模块； 所述交叉点控制模块包括电压设定 单元和反馈控制单元；
所述电压设定单元设置为： 设定参考电压；
所述反馈控制单元设置为： 对电吸收调制激光器输出眼图的交叉点对应 内。 ' 、 ' 、一 乡 、 、 工
2、 如权利要求 1所述的控制装置， 其中，
所述电压设定单元是设置为： 将期望的交叉点稳定位置对应的电压设定 为初始参考电压。
3、 如权利要求 2所述的控制装置， 其中，
所述控制装置还包括温度补偿模块；
所述温度补偿模块设置为： 根据检测电吸收调制激光器的温度确定相对 于所述初始参考电压的补偿电压量并输入至所述电压设定单元；
所述电压设定单元还设置为：根据所述补偿电压量调整当前的参考电压。
4、 如权利要求 3所述的控制装置， 其中，
所述温度补偿模块包括温度检测单元和电压控制单元；
所述温度检测及转换单元设置为： 将与电吸收调制激光器的温度对应的 电压量发送至所述电压控制单元；
所述电压控制单元设置为： 根据所述电压量计算电吸收调制激光器的温 度并根据电吸收调制激光器的温度计算相对于所述初始参考电压的补偿电压 量。
5、 如权利要求 1所述的控制装置， 其中，
所述反馈控制单元包括依次相连的误差控制器、 可控电流源、 电流电压 变换器； 还包括连接在可控电流源和误差控制器的反向输入端之间的反馈电
6、 如权利要求 1所述的控制装置， 其中，
所述电吸收调制激光器为速率为 40G或 40G以上的电吸收调制激光器。
7、 一种提高眼图交叉点稳定性的方法， 包括：
设定参考电压； 对电吸收调制激光器输出眼图的交叉点对应的交叉点电
8、 如权利要求 7所述的方法， 其中，
将期望的交叉点稳定位置对应的电压设定为初始参考电压。
9、 如权利要求 8所述的方法， 其中，
根据检测电吸收调制激光器的温度确定相对于所述初始参考电压的补偿 电压量； 根据所述补偿电压量调整当前的参考电压。
10、 如权利要求 9所述的方法， 其中，
所述根据检测电吸收调制激光器的温度确定相对于所述初始参考电压的 补偿电压量包括： 确定与电吸收调制激光器的温度对应的电压量， 根据所述 电压量计算电吸收调制激光器的温度并根据电吸收调制激光器的温度计算相 对于所述初始参考电压的补偿电压量。
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