WO2009152658A1 - 可调谐激光器模块及其控制方法 - Google Patents

可调谐激光器模块及其控制方法 Download PDF

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Publication number
WO2009152658A1
WO2009152658A1 PCT/CN2008/071362 CN2008071362W WO2009152658A1 WO 2009152658 A1 WO2009152658 A1 WO 2009152658A1 CN 2008071362 W CN2008071362 W CN 2008071362W WO 2009152658 A1 WO2009152658 A1 WO 2009152658A1
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Prior art keywords
control circuit
wavelength
laser
distributed feedback
potentiometer
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PCT/CN2008/071362
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English (en)
French (fr)
Inventor
薛江
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中兴通讯股份有限公司
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Priority to PCT/CN2008/071362 priority Critical patent/WO2009152658A1/zh
Priority to CN2008801289488A priority patent/CN102017473A/zh
Publication of WO2009152658A1 publication Critical patent/WO2009152658A1/zh

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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
    • H04B10/50—Transmitters
    • H04B10/572—Wavelength control
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S5/00—Semiconductor lasers
    • H01S5/06—Arrangements for controlling the laser output parameters, e.g. by operating on the active medium
    • H01S5/068—Stabilisation of laser output parameters
    • H01S5/0683—Stabilisation of laser output parameters by monitoring the optical output parameters
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S5/00—Semiconductor lasers
    • H01S5/02—Structural details or components not essential to laser action
    • H01S5/024—Arrangements for thermal management
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S5/00—Semiconductor lasers
    • H01S5/06—Arrangements for controlling the laser output parameters, e.g. by operating on the active medium
    • H01S5/062—Arrangements for controlling the laser output parameters, e.g. by operating on the active medium by varying the potential of the electrodes
    • H01S5/0625—Arrangements for controlling the laser output parameters, e.g. by operating on the active medium by varying the potential of the electrodes in multi-section lasers
    • H01S5/06255—Controlling the frequency of the radiation
    • H01S5/06258—Controlling the frequency of the radiation with DFB-structure
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S5/00—Semiconductor lasers
    • H01S5/06—Arrangements for controlling the laser output parameters, e.g. by operating on the active medium
    • H01S5/068—Stabilisation of laser output parameters
    • H01S5/0683—Stabilisation of laser output parameters by monitoring the optical output parameters
    • H01S5/0687—Stabilising the frequency of the laser

Definitions

  • the present invention relates to the field of digital optical fiber transmission systems, and in particular, to a tunable laser module and a control method thereof.
  • BACKGROUND With the continuous development of optical communication technologies, optical transmitting modules and optical receiving modules have been more and more widely applied to optical transmission systems, and function as optical-electrical, electro-optical conversion. The performance of the light emitting module and the light receiving module has an important influence on the optical transmission system specifications.
  • the telecommunication device passes the electrical signal to the optical transmitting module, and the optical transmitting module modulates the electrical signal into an optical signal output by the laser, thereby realizing the transmission of the signal in the optical domain.
  • Medium and long-distance optical transmission systems generally use a refrigerated electro-absorption laser, and the operating wavelength of the laser must meet the specific wavelength requirements of the minimum channel spacing of 100 GHz for G.652/G.655 fiber specified in ITU-T G. .
  • the optical transmitting module generally includes: a wavelength tuning circuit for switching between different modes of the laser, that is, a wavelength tunable function; an automatic power control circuit (APC) for stabilizing the laser transmitting light Power, providing a monitoring value related to the laser output optical power and the bias current of the laser; the driver control circuit modulates the input electrical signal (including the differential data signal and the differential clock signal) into an optical signal output by the laser to realize the electrical signal To the conversion of the optical signal, the extinction ratio of the laser output optical signal is guaranteed to be stable; the automatic temperature control circuit (ATC) is used to stabilize the temperature of the laser die and stabilize the wavelength of the light, and to provide a laser on the other hand.
  • ATC automatic power control circuit
  • the monitoring value of the die temperature and the temperature limit alarm signal; the shutdown control and performance detection circuit In the process of implementing the technical solution of the present invention, the inventors have found that: the conventional laser wavelength tuning by the die temperature can be tuned to a narrow range, usually only covers C wavelength 100G interval 4 wavelengths; and the number of spare parts in the transmission system is relatively More, higher cost.
  • the present invention has been made in view of the problem that a conventional tunable range of a laser that is wavelength-tuned by a die temperature is narrow in the related art, and the present invention is directed to provide a tunable laser module and a control method thereof. To solve the above problems.
  • a tunable laser module includes a distributed feedback laser, an automatic optical power control circuit, a driver control circuit, an automatic temperature control circuit, a turn-off control, and a performance detection circuit, and the distributed feedback laser is electrically connected to each circuit;
  • the tuned laser module also includes a Bragg voltage control circuit electrically coupled to the distributed feedback laser.
  • the Bragg voltage control circuit is provided with a digital-to-analog converter that switches wavelengths of light.
  • the above-mentioned automatic optical power control circuit is configured with a first potentiometer for adjusting the power of the optical signal of the distributed feedback laser; and a second potentiometer for adjusting the extinction ratio of the optical signal of the distributed feedback laser is arranged in the driver control circuit; A third potentiometer is provided in the temperature control circuit for adjusting the wavelength of the light of the distributed feedback laser.
  • a method of controlling a tunable laser module is provided.
  • the control method of the tunable laser module includes: writing a default value to the driver control circuit; determining the third potentiometer of the automatic temperature control circuit corresponding to the optical wavelength channel according to the index of the distributed feedback laser Value, and write the determined value to the third potentiometer; adjust the value of the digital-to-analog converter in the Bragg voltage control circuit to adjust the wavelength of the light to the corresponding grid, and maximize the side mode suppression ratio of the optical wavelength Adjusting the third potentiometer in the automatic temperature control circuit to adjust the wavelength of the light to a predetermined range; adjusting the first potentiometer of the automatic optical power control circuit to adjust the output optical signal power of the distributed feedback laser.
  • the side mode suppression ratio of the optical wavelength is maximized to be: after the wavelength deviation is required to be within a range of ⁇ 3 GHz, the side mode suppression ratio of the wavelength of the distributed feedback laser is tested, and the digital-to-analog converter of the Bragg voltage control circuit is adjusted. The value of the side mode is maximized.
  • FIG. 1 is a schematic block diagram of a tunable laser module according to an embodiment of the present invention
  • FIG. 2 is a schematic block diagram of a tunable laser module according to an embodiment of the present invention
  • FIG. 3 is an embodiment of the present invention.
  • a tunable laser module is first provided.
  • a distributed feedback (Distributed Feed Back, DFB for short) laser is used as a core component.
  • DFB distributed Feed Back
  • 1 is a block diagram showing a schematic structure of a tunable laser module in accordance with an embodiment of the present invention.
  • a tunable laser module according to an embodiment of the present invention includes a DFB laser 1, an APC circuit 2, a driver control circuit 3, an ATC circuit 4, and a shutdown control and performance detecting circuit 6, and also includes a DFB.
  • a digital to analog converter (DAC) for wavelength switching of light is disposed in the Bragg voltage control circuit 5.
  • DAC digital to analog converter
  • a first potentiometer RA1 for adjusting the optical signal power of the DFB laser 1 is disposed in the APC circuit 2;
  • a second potentiometer RA2 for adjusting the extinction ratio of the optical signal of the DFB laser 1 is disposed in the driver control circuit 3;
  • a third potentiometer RA3 for stabilizing the die temperature of the DFB laser 1 and thereby stabilizing the optical wavelength of the DFB laser 1 is disposed in the ATC circuit 4.
  • the DFB laser 1 has: a Vbrag port connected to the Bragg voltage control circuit; a thermistor (RT) port and a semiconductor cooler (TEC) port connected to the ATC circuit; and a port connected to the high speed driver in the driver control circuit; The port to which the APC circuit is connected; the optical signal output port.
  • DFB lasers also include optical isolators and the like, which are not mentioned here.
  • the ATC circuit, the driver control circuit, the shutdown control circuit and the APC circuit have a serial electrical connection, and the tunable laser module further has an external serial interface.
  • the shutdown control circuit has clock regeneration, laser shutdown, and module in-position identification.
  • the wavelength meter is observed, and the value of the DAC of the Bragg voltage control circuit is repeatedly adjusted to adjust the wavelength of the light to the corresponding ITU grid; after the wavelength deviation is within the range of ⁇ 3 GHz, the side mode suppression ratio of the laser light wavelength is tested. , adjust the DAC value of the Bragg voltage circuit again, and require the side touch suppression ratio to reach the maximum.
  • step S308 since the optical wavelength adjustment process of step S206 causes a small deviation of the optical wavelength, it is necessary to adjust the RA3 in the automatic temperature control circuit again to re-adjust the optical wavelength to the required range.
  • RA1 of the APC circuit is adjusted to adjust the output optical signal power of the DFB laser.
  • the parameter adjustment of one optical wavelength channel of the tunable laser can be completed.
  • the parameters involved in the above control method can be written into the electrically erasable programmable read only memory (EEPROM) by calibration, and all the values corresponding to the optical wavelength channels are recorded.
  • EEPROM electrically erasable programmable read only memory
  • the tunable laser module provided by the present invention has a wider tunable range by adding a Bragg voltage control circuit, and covers a C-band 100G interval of 16 Wavelength, while the traditional wavelength-tuned lasers relying on the die temperature can only cover C-band 100G interval 4 wavelengths; due to the use of micro-control unit and digital adjustment circuit, the tunable laser module parameters adjustment and performance detection Digitized, in this way, the tuning function of the laser can be conveniently realized by using the micro control unit software program; because the module covers a wider wavelength, the number of spare parts in the transmission system is greatly reduced, which indirectly reduces the cost of the transmission system; The production and debugging process of the laser module is easy to automate, which can effectively improve production efficiency and directly reduce production costs.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Semiconductor Lasers (AREA)

Description

可调谐激光器模块及其控制方法
技术领域 本发明涉及数字光纤传输***领域， 具体地， 涉及一种可调谐激光器模 块及其控制方法。 背景技术 随着光通信技术的不断发展，光发射模块和光接收模块已经越来越广泛 地应用到光传输***中， 起到光 -电、 电-光转换的作用。 光发射模块和光接 收模块的性能对光传输***指标有重要影响。 电信设备将电信号经过处理后 送入光发送模块， 光发送模块将电信号调制成激光器输出的光信号， 从而实 现信号在光域内的传输。 中、 长距离光传输***一般采用有制冷电吸收激光 器， 并且， 激光器的工作波长要满足 ITU-TG.692规定的适用于 G.652/G.655 光纤的最小通道间隔为 100GHz的特定波长要求。 具体来讲， 光发送模块通常包括： 波长调谐电路， 用以实现激光器在不 同模式间切换， 即波长可调谐功能； 自动功率控制电路 （Automatic Power Control, 简称为 APC ), 用于稳定激光器发送光功率， 提供与激光器输出光 功率和激光器的偏置电流大小相关的监测值； 驱动器控制电路， 将输入的电 信号 （包括差分数据信号和差分时钟信号）调制成激光器输出的光信号， 实 现电信号到光信号的转换， 保证激光器输出光信号的消光比指标稳定； 自动 温度控制电路 ( Automatic Temperature Control, 简称为 ATC ), —方面用于 稳定激光器管芯温度进而稳定光波长， 另一方面提供激光器管芯温度的监测 值及温度越限告警信号； 关断控制及性能检测电路。 在实现本发明技术方案的过程中， 发明人发现： 传统的依靠管芯温度进 行波长调谐的激光器可调谐范围较窄， 通常只能覆盖 C波段 100G间隔 4个 波长； 并且传输***中备件数量较多， 成本较高。 发明内容 考虑到相关技术中存在的传统的依靠管芯温度进行波长调谐的激光器 可调谐范围较窄的问题而提出本发明， 为此， 本发明旨在提供一种可调谐激 光器模块及控制方法， 用以解决上述问题。 为达此目的， 才艮据本发明的一个方面， 提供了一种可调谐激光器模块。 才艮据本发明实施例的可调谐激光器模块包括分布反馈激光器、 自动光功 率控制电路、 驱动器控制电路、 自动温控电路、 关断控制及性能检测电路， 分布反馈激光器与各电路电连接； 可调谐激光器模块还包括与分布反馈激光 器电连接的布拉格电压控制电路。 优选地，上述布拉格电压控制电路配置有对光进行波长切换的数字模拟 转换器。 优选地，上述自动光功率控制电路中配置有用以调整分布反馈激光器的 光信号功率的第一电位器； 驱动器控制电路中配置有用以调整分布反馈激光 器的光信号消光比的第二电位器； 自动温控电路中配置有用以调整分布反馈 激光器的光波长的第三电位器。 根据本发明的一个方面， 提供了一种可调谐激光器模块的控制方法。 才艮据本发明实施例的可调谐激光器模块的控制方法包括：对驱动器控制 电路写入缺省值； 根据分布反馈激光器的指标书确定光波长通道对应的自动 温控电路的第三电位器的值， 并将确定的值写入第三电位器； 通过调整布拉 格电压控制电路中的数字模拟转换器的值， 将光波长调整到相应栅格上， 并 使光波长的边模抑制比达到最大； 调整自动温控电路中的第三电位器， 将光 波长调整到预定范围； 调整自动光功率控制电路的第一电位器， 以调整分布 反馈激光器的输出光信号功率。 优选地， 使光波长的边模抑制比达到最大具体为： 在波长偏差在要求在 ± 3GHz 范围内之后， 测试分布反馈激光器的波长的边模抑制比， 调整布拉 格电压控制电路的数字模拟转换器的值， 使得边模抑制比达到最大。 上述技术方案具有以下优点或有益效果：本发明提供的可调谐激光器模 块及其控制方法， 与其它可调谐模块比较， 具有更宽的可调谐范围。 本发明的其它特征和优点将在随后的说明书中阐述， 并且， 部分地从说 明书中变得显而易见， 或者通过实施本发明而了解。 本发明的目的和其他优 点可通过在所写的说明书、 权利要求书、 以及附图中所特别指出的结构来实 现和获得。 附图说明 附图用来提供对本发明的进一步理解， 并且构成说明书的一部分， 与本 发明的实施例一起用于解释本发明， 并不构成对本发明的限制。 在附图中： 图 1是根据本发明实施例的可调谐激光器模块的简要结构框图； 图 2是才艮据本发明实施例的可调谐激光器模块的原理框图； 图 3是根据本发明实施例的可调谐激光器模块的控制方法流程图。 具体实施方式 以下结合附图对本发明的优选实施例进行说明， 应当理解， 此处所描述 的优选实施例仅用于说明和解释本发明， 并不用于限定本发明。 装置实施例 才艮据本发明实施例， 首先提供了一种可调谐激光器模块， 本实施例采用 分布反馈 ( Distributed Feed Back, 简称为 DFB ) 激光器作为核心部件。 图 1是根据本发明实施例的可调谐激光器模块的简要结构框图。 如图 1所示， 根据本发明实施例的可调谐激光器模块， 包括 DFB激光 器 1、 APC电路 2、 驱动器控制电路 3、 ATC电路 4、 以及关断控制及性能检 测电路 6, 并且还包括与 DFB激光器 1电连接的布拉格电压控制电路 5, 其 中， DFB激光器 1与上述的各电路电连接。 图 2是才艮据本发明实施例的可调谐激光器模块的原理框图，以下进一步 参照图 2描述上述各个部件的细节。 布拉格电压控制电路 5 中配置有对光进行波长切换的数字模拟转换器 ( Digital to Analog Converter, 简称为 DAC )。 另夕卜， APC电路 2中配置有用以调整 DFB激光器 1的光信号功率的第 一电位器 RA1 ; 驱动器控制电路 3中配置有用以调整 DFB激光器 1的光信 号消光比的第二电位器 RA2; ATC电路 4中配置有用以稳定 DFB激光器 1 的管芯温度进而稳定 DFB激光器 1的光波长的第三电位器 RA3。
DFB激光器 1上具有： 与布拉格电压控制电路相连的 Vbrag端口； 与 ATC电路相连的热敏电阻（ RT )端口和半导体制冷器（ TEC )端口； 与驱动 器控制电路中的高速驱动器相连的端口； 与 APC电路相连的端口； 光信号输 出端口。 DFB激光器内部还包括光隔离器等， 在此不再赞述。 另外， ATC电路、 驱动器控制电路、 关断控制电路与 APC电路之间具 有串行电性连接， 上述可调谐激光器模块还具有对外的串行接口。 关断控制 电路具有时钟再生、 激光器关断和模块在位识别功能。 方法实施例 根据本发明实施例， 提供了一种可调谐激光器模块的控制方法。 图 3 是根据本发明实施例的可调谐激光器模块的控制方法流程图， 如图 3所示， 才艮据本发明实施例的可调谐激光器模块的控制方法包括：
S302.对驱动器控制电路写入缺省值；
S304.根据分布反馈激光器的指标书确定光波长通道对应的自动温控电 路的第三电位器的值， 并将确定的值写入第三电位器；
S306.通过调整布拉格电压控制电路中的数字模拟转换器的值， 将光波 长调整到相应栅格上， 并使光波长的边模抑制比达到最大；
S308.调整自动温控电路中的第三电位器， 将光波长调整到预定范围；
S310.调整自动光功率控制电路的第一电位器， 以调整分布反馈激光器 的输出光信号功率。 下面对上述控制方法具体解释：
S302中， 作为 DFB激光器正常工作的前提条件， 需要对驱动器控制电 路中的各电位器、 控制眼图交叉点和偏置电压等写入缺省值， 此处， 驱动器 控制电路主要起到放大电信号的作用。 S304 中， 根据 DFB 激光器指标书计算出每个光波长通道对应的 ATC 电路的数字电位器 RA3的值，并将确定的值通过上位机软件写入到 RA3中。
S306中， 观察波长计， 反复调整布拉格电压控制电路的 DAC的值将光 波长调整到对应的 ITU的栅格上； 在波长偏差在要求 ± 3GHz范围内后， 测 试激光器光波长的边模抑制比， 再次调整布拉格电压电路的 DAC值， 要求 边摸抑制比达到最大。
S308中， 因为步骤 S206的光波长调整过程会导致光波长的啟小偏差， 所以需要再次调整自动温控电路中的 RA3 , 将光波长重新调整到要求的范围 内。
S310中， 调整 APC电路的 RA1 , 以调整 DFB激光器的输出光信号功 率。 通过上述操作， 即可完成可调谐激光器的一个光波长通道的参数调整。 在此之后， 可以通过定标， 将上述控制方法中所涉及到的参数写入到电可擦 可编程只读存储器 （EEPROM ) 中， 并记录各光波长通道对应的所有数值。 综上， 本发明实施例提供的技术方案具有以下优点或有益效果： 本发明 所提供的可调谐激光器模块， 通过增加布拉格电压控制电路， 具有更宽的可 调谐范围， 覆盖 C波段 100G间隔 16个波长， 而传统的依靠管芯温度进行波 长调谐的激光器通常只能覆盖 C波段 100G间隔 4个波长； 由于采用了微控 单元和数字调节电路， 实现了可调谐激光器模块参数调整和性能检测的全数 字化， 这样， 利用微控制单元软件程序即可方便地实现激光器的调谐功能； 由于该模块覆盖更广的波长， 使传输***中的备件数量大大减少， 间接降低 了传输***的成本； 该可调谐激光器模块的生产调试过程易于实现自动化， 能有效地提高生产效率、 直接降低生产成本。 以上仅为本发明的优选实施例而已， 并不用于限制本发明， 对于本领域 的技术人员来说， 本发明可以有各种更改和变化。 凡在本发明的精神和原则 之内， 所作的任何修改、 等同替换、 改进等， 均应包含在本发明的保护范围 之内。

Claims

权 利 要 求 书 一种可调谐激光器模块， 包括分布反馈激光器、 自动光功率控制电路、 驱动器控制电路、 自动温控电路、 关断控制及性能检测电路， 所述分布 反馈激光器与所述各电路电连接， 其特征在于， 所述可调谐激光器还包 括与所述分布反馈激光器电连接的布拉格电压控制电路。 根据权利要求 1所述的模块， 其特征在于， 所述布拉格电压控制电路配 置有对光进行波长切换的数字模拟转换器。 根据权利要求 1所述的模块， 其特征在于，
所述自动光功率控制电路中配置有用以调整所述分布反馈激光器 的光信号功率的第一电位器；
所述驱动器控制电路中配置有用以调整所述分布反馈激光器的光 信号消光比的第二电位器；
所述自动温控电路中配置有用以调整所述分布反馈激光器的光波 长的第三电位器。 一种可调谐激光器模块的控制方法， 其特征在于， 包括：
对驱动器控制电路写入缺省值；
才艮据分布反馈激光器的指标书确定光波长通道对应的自动温控电 路的第三电位器的值， 并将确定的所述值写入所述第三电位器；
通过调整布拉格电压控制电路中的数字模拟转换器的值，将光波长 调整到相应栅格上， 并使光波长的边模抑制比达到最大；
调整所述自动温控电路中的所述第三电位器，将光波长调整到预定 范围；
调整自动光功率控制电路的第一电位器， 以调整所述分布反馈激光 器的输出光信号功率。
1
5. 根据权利要求 4所述的方法， 其特征在于， 所述使光波长的边模抑制比 达到最大具体为：
在波长偏差在要求在 ± 3GHz范围内之后， 测试所述分布反馈激光 器的波长的边模抑制比， 调整所述布拉格电压控制电路的数字模拟转换 器的值， 使得所述边模抑制比达到最大。
2
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