WO2016000119A1 - 一种激光器突发控制电路和方法 - Google Patents

一种激光器突发控制电路和方法 Download PDF

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Publication number
WO2016000119A1
WO2016000119A1 PCT/CN2014/081129 CN2014081129W WO2016000119A1 WO 2016000119 A1 WO2016000119 A1 WO 2016000119A1 CN 2014081129 W CN2014081129 W CN 2014081129W WO 2016000119 A1 WO2016000119 A1 WO 2016000119A1
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Prior art keywords
laser
circuit
switch
logic
onu
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PCT/CN2014/081129
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English (en)
French (fr)
Inventor
蒋旭
宋媛
张书源
许远忠
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索尔思光电（成都）有限公司
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Priority to JP2016574186A priority Critical patent/JP6330061B2/ja
Priority to CN201480001223.8A priority patent/CN104604050B/zh
Priority to US14/522,409 priority patent/US9325421B1/en
Priority to PCT/CN2014/081129 priority patent/WO2016000119A1/zh
Priority to EP14896608.8A priority patent/EP3133750B1/en
Publication of WO2016000119A1 publication Critical patent/WO2016000119A1/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
    • H04B10/501—Structural aspects
    • H04B10/503—Laser transmitters
    • 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
    • H01S5/06832—Stabilising during amplitude modulation
    • 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
    • H01S5/10—Construction or shape of the optical resonator, e.g. extended or external cavity, coupled cavities, bent-guide, varying width, thickness or composition of the active region
    • H01S5/12—Construction or shape of the optical resonator, e.g. extended or external cavity, coupled cavities, bent-guide, varying width, thickness or composition of the active region the resonator having a periodic structure, e.g. in distributed feedback [DFB] lasers
    • 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
    • H04B10/27—Arrangements for networking
    • H04B10/272—Star-type networks or tree-type networks
    • 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
    • H04B10/564—Power control

Definitions

  • the present invention relates to the field of lasers, and more particularly to a circuit and method for laser burst control. Background technique
  • a laser driver supporting burst mode is required to realize the sudden operation of the laser, but for a laser of 10G or higher, such as a DFB laser (Distributed Feedback Laser, Distnbiiied Feedback Laser) Or EML laser (Eiectlro-absorption Modulated Laser), currently only laser drivers that support continuous mode operation.
  • a laser of 10G or higher such as a DFB laser (Distributed Feedback Laser, Distnbiiied Feedback Laser) Or EML laser (Eiectlro-absorption Modulated Laser)
  • 10G PON Passive Optica Network
  • ONU Optical Network Unit
  • the present invention provides a circuit and method for laser burst control in order to well solve the burst control of the laser.
  • the invention provides the following technical solutions:
  • a laser burst control circuit is provided with a burst control circuit in the APC loop, the burst control circuit includes: a Switch switch and a diode series circuit, and then connected in parallel with the laser, and the Sw ch switch is turned on and off by an external logic Break, realize the burst mode control of the laser.
  • the external logic control is: controlling the switch switch and the bandwidth selection circuit by inputting high and low logic levels.
  • the bandwidth selection circuit includes two functional circuits, one is a high and low bandwidth selection circuit, and the other is a delay circuit.
  • the high and low bandwidth selection circuit includes two modes, a fast tracking mode and a slow tracking mode. Trace mode.
  • the external logic control controls the Switch switch and the bandwidth selection circuit by inputting high and low logic levels
  • the laser has no optical signal output, and the bandwidth selection circuit enters the fast tracking mode; when the input is At low level, the laser outputs a normal optical signal while the bandwidth selection circuit enters the slow tracking mode.
  • the function of the delay circuit is to delay the input burst control logic, so that the APC loop can work in the fast tracking mode before the laser works, the APC can be quickly established, and the laser output stabilizes the power, and then the APC Enter the slow tracking mode to ensure stable operation of the laser under different patterns.
  • a method for controlling a laser burst control circuit is characterized in that: when the input logic of the PON system is that the ONU lighting control logic is high, the switch is in an off state, and the ONU transmitting end is an ONU light output to send an optical signal.
  • the laser driver works normally to make the laser emit light.
  • the bandwidth selection logic is low, and the bandwidth tracking circuit is in the fast tracking mode.
  • the bandwidth selection logic is set to a high level.
  • the bandwidth tracking circuit is in a slow stable tracking mode to ensure that the laser can stably output the optical signal;
  • the ONU illumination control logic is set low, the Switch switch is in the closed state, and the ONU transmitter end is the ONU light output to turn off the laser light signal output.
  • the laser is connected in parallel with the diode tube, and the voltage/current reduction at both ends makes the laser dull.
  • the output, and the bandwidth tracking circuit is in fast tracking mode until the next ONU optical signal transmission control logic is set high.
  • the present invention does not require a laser driver having a burst mode function to control the laser to respond quickly through an external switching circuit. Especially for high-speed signals, such as 10G PON applications, it can meet the burst mode requirements of the PON system for ONUs;
  • FIG. 1 is a circuit diagram of a circuit module of the present invention.
  • Figure 2 shows the design of the EML burst control circuit.
  • Figure 3 shows the DFB burst control circuit design.
  • Figure 4 shows the bandwidth selection circuit design.
  • FIG. 5 controls the timing logic diagram.
  • the present invention provides a laser burst control circuit, which adds a burst control logic circuit in an APC loop of an automatic power control circuit, connects a Switch switch and a diode in series, and then connects in parallel with the laser and through an external system.
  • the logic controls the opening and closing of the Swch switch, enabling the continuous mode laser driver to operate in burst mode.
  • Burst control also controls the Switch switch and bandwidth selection circuit by inputting high and low logic levels.
  • the bandwidth selection circuit enters the fast tracking mode.
  • the bandwidth selection circuit enters the slow tracking mode to ensure stable operation of the APC loop.
  • an EM L laser is used to implement the burst control circuit design.
  • this part realizes the burst mode control of the laser by connecting a switch switch and a diode in series, and then in parallel with the EML laser, and turning on and off by an external logic control switch.
  • the burst control also controls the switch and bandwidth through the high and low logic levels of the PON system input.
  • Select the circuit, TTL (logic gate ransistor-Transistor Logic) high level is 2.4 ⁇ 3.3V, low level is 0 ⁇ 0.8V.
  • the input control logic is the system input, and the system inputs the high and low levels to control whether the ONU is illuminated according to requirements.
  • the EML laser When the input is high, the EML laser has no output, and the bandwidth selection circuit enters the fast tracking mode. When the input is low, the laser outputs a normal optical signal, and the bandwidth selection circuit enters the slow tracking mode to ensure that the output optical power passes.
  • the APC loop works steadily.
  • FIG. 3 is a specific circuit design diagram of a DFB laser using the present invention.
  • this part is designed to be connected in series with the diode through a switch or a field effect transistor, and then connected in parallel with the DFB laser, and the external logic control switch is turned on and off to realize the burst mode control of the DFB laser.
  • Burst control controls the switch and bandwidth selection circuit by inputting high and low logic levels.
  • TTL random-transistor Logic
  • the bandwidth selection circuit When the input is high, the DFB laser has no output, and the bandwidth selection circuit enters the fast tracking mode. When the input is low, the DFB laser outputs a normal optical signal, and the bandwidth selection circuit enters the slow tracking mode to ensure the output optical power. Stable operation through the APC loop.
  • the bandwidth selection circuit includes two functional blocks, one is high and low bandwidth, including a fast tracking mode and a slow tracking mode; It is a delay circuit.
  • the function of the delay circuit is to delay the input burst control logic by 20ns.
  • the laser can be operated in the first 20ns, and the APC loop can work in the fast tracking mode. That is, the APC can quickly establish and stabilize the power of the laser output, and then the APC. Enter the slow tracking mode to ensure stable operation of the laser under different patterns.
  • resistors R1, R2 and capacitor C1 are selectable bandwidth parameters, Rl, switch-band and CI, constitutes a fast tracking circuit; R2 and CI form a slow tracking circuit.
  • R1 and R2 are connected in parallel.
  • R1 is lOohm
  • 2 is 200 ohm
  • C1 can be O.OluF
  • FIG. 5 is a logic control timing diagram of the present invention.
  • the PON system input logic that is, the ONU lighting control logic
  • the ONU transmitting end that is, the ONU light output
  • an optical signal that is, Sw ch in FIG. 2 and FIG. 3 as described above.
  • the laser driver works normally to make the laser emit light.
  • the bandwidth selection logic is low. That is, Switch CTR (Switch control) in Figure 4 makes the Switch-Band switch closed, and the bandwidth in Figure 4
  • the tracking circuit is in fast tracking mode; when the ONU optical output is stable, the bandwidth selection logic is set high.
  • the Switch CTR in Figure 4 turns the Switch-Band switch on, the bandwidth tracking circuit is in slow stable tracking mode, and ensures that the laser can Stable output optical signal.
  • the ONU illumination control logic is set low, the ONU transmitter is the ONU light output, and the laser light signal output is turned off.
  • the Switch is closed, the laser is connected in parallel with the diode, and the voltage/current decreases at both ends.
  • the laser has no light output, and the bandwidth tracking circuit is in fast tracking mode until the next ONU optical signal transmission control logic is set high.
  • the present invention does not require a laser driver having a burst mode function, the laser driver always operates in a continuous mode, but the laser is quickly responded by an external switching circuit. Especially for high-speed signals, such as 10G PON applications, there is no chip support for burst mode laser drivers. This solution can meet the burst mode requirements of the PON system for ONUs. Low cost, simple implementation, and can be used with both DFB and EML lasers. Bandwidth switching through switch and filter circuit ensures fast establishment and normal APC loop

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

Abstract

一种激光器突发控制电路和方法，在APC环路中添加突发控制电路，将一个Switch开关和二极管串联，再与激光器并联，并通过外部逻辑控制开关打开和关断使连续模式的激光驱动器能够工作在突发模式。突发控制还通过输入高低逻辑电平控制Switch开关和带宽选择电路，当输入为高电平时，激光器无输出，同时带宽选择电路进入快速跟踪模式；当输入为低电平时，激光器输出正常光信号，同时带宽选择电路进入慢速跟踪模式，保证APC环路能够稳定工作。通过外部开关电路控制激光器快速响应，满足PON系统对ONU的突发模式指标要求，同时成本低，实现简单。

Description

一种激光器突发控制电路和方法 技术领域
本发明涉及一种激光器领域， 特别是一种激光器突发控制的电路和方法。 背景技术
在传统的突发模式激光器驱动电路中， 需要有支持突发模式的激光驱动器 才能实现激光器的突发工作， 但对于 10G或更高速率的激光器如 DFB激光器 (分布式反馈激光器， Distnbiiied Feedback Laser)或 EML激光器 （电吸收调制 激光器， Eiectlro-absorption Modulated Laser) , 目前仅有支持连续模式工作的激 光驱动器。 随着 10G PON (无源光纤网络， Passive Optica Network) 应用的 发展， 需要有支持 10G或更高速率的 ONU (光网络单元， Optical Network Unit) 产品满足突发模式工作的 PON 系统应用要求。 发明内容
本发明为了很好的解决对激光器的突发控制， 提供一种激光器突发控制的 电路和方法。 本发明提供了以下技术方案：
一种激光器突发控制电路， 在 APC 回路中添加突发控制电路， 所述突发控 制电路包括： 一个 Switch开关和二极管串联电路， 再与激光器并联， 并通过外 部逻辑控制 Sw ch开关打开和关断， 实现激光器的突发模式控制。
进一歩的， 所述的外部逻辑控制为： 通过输入高低逻辑电平控制 Switch开关 和带宽选择电路。
进一歩的，所述的带宽选择电路包括两个功能电路，一是高低带宽选择电路， 另一个是延迟电路。
进一歩的， 所述的高低带宽选择电路包括两个模式， 快速跟踪模式和慢速跟 踪模式。
进一歩的，所述的外部逻辑控制通过输入高低逻辑电平控制 Switch开关和带 宽选择电路时， 当输入为高电平时， 激光器无光信号输出， 同时带宽选择电路 进入快速跟踪模式； 当输入为低电平时， 激光器输出正常光信号， 同时带宽选 择电路进入慢速跟踪模式。
进一歩的， 所述的延迟电路的功能是将输入突发控制逻辑延迟， 让激光器在 工作前， APC环路能工作在快速跟踪模式， APC能够快速建立， 并使得激光器输 出稳定功率， 然后 APC进入慢速跟踪模式， 保证不同码型下激光器的稳定工作。
一种激光器突发控制电路的控制方法，其特征在于，该方法为： 当 PON 系 统输入逻辑即 ONU发光控制逻辑为高时， Switch开关处于断开状态， ONU发 射端即 ONU光输出送出光信号， 激光驱动器正常工作使激光器发光， 同时在光 信号输出前 20ns, 带宽选择逻辑为低电平， 带宽跟踪电路处于快速跟踪模式； 当 ONU光信号输出稳定后，带宽选择逻辑置为高电平，带宽跟踪电路处于 慢速稳定跟踪模式， 保证激光器能够稳定输出光信号；
直到 PON 系统输入逻辑即 ONU发光控制逻辑置低， Switch 开关处于闭合 状态， ONU发射端即 ONU光输出关断激光器光信号输出， 激光器与二极光管 并联， 两端电压 /电流降低使激光器无光输出， 并且带宽跟踪电路处于快速跟踪 模式直到下一次 ONU光信号送出控制逻辑置高。
与现有技术相比， 本发明的有益效果-
1.本发明不需要具有突发模式功能的激光驱动器，通过外部开关电路控制激 光器快速响应。 特别是对于高速信号， 比如 10G PON的应用， 能满足 PON系 统对 ONU的突发模式指标要求；
2.成本低， 实现简单， 对 DFB 和 EML激光器都能使用， 通过开关和滤波 电路实现带宽切换保证 APC环路快速建立和正常工作。 附图说明
图 1 为本发明的电路模块设计图。
图 2为 EML突发控制电路设计图。
图 3 为 DFB突发控制电路设计图。
图 4 为带宽选择电路设计图。
图 5控制时序逻辑图。
具体实施方式
下面结合具体实施方式对本发明作进一歩的详细描述。 但不应将此理解 为本发明上述主题的范围仅限于以下的实施例， 凡基于本发明内容所实现的技 术均属于本发明的范围。
结合图 1， 本发明提供了一种激光器突发控制电路， 在自动功率控制电路 APC环路中添加突发控制逻辑电路， 将一个 Switch开关和二极管串联， 再与激 光器并联， 并通过外部系统突发逻辑控制 Sw ch开关的打开和关断， 使连续模 式的激光驱动器能够工作在突发模式。 突发控制还通过输入高低逻辑电平控制 Switch 开关和带宽选择电路， 当输入为高电平时， 激光器无输出同时带宽选择 电路进入快速跟踪模式； 当输入为低电平时， 激光器输出正常光信号， 同时带 宽选择电路进入慢速跟踪模式， 保证 APC环路能够稳定工作。
实施例 1
结合图 2， 使用 EM L激光器来实现突发控制电路设计。在图 2中的激光器突 发控制部分电路中，该部分通过将一个 Switch开关和二极管串联之后，再与 EML 激光器并联， 通过外部逻辑控制开关打开和关断实现激光器的突发模式控制。
另外突发控制还通过 PON系统输入的高低逻辑电平控制 Switch开关和带宽 选择电路， TTL (逻辑门电路 ransistor-Transistor Logic )高电平为 2.4~3.3V， 低电 平为 0~0.8V。该输入控制逻辑是系统输入，系统根据要求输入高低电平控制 0NU 是否发光。
当输入为高电平时， EML激光器无输出， 同时带宽选择电路进入快速跟踪 模式； 当输入为低电平时， 激光器输出正常光信号， 同时带宽选择电路进入慢 速跟踪模式， 以保证输出光功率通过 APC回路稳定工作。
实施例 2
结合图 3， 为本发明的使用 DFB激光器的具体电路设计图。
激光器突发控制部分电路中，该部分设计为通过 Switch开关或者场效应晶体 管与二极管串联， 再与 DFB激光器并联， 通过外部逻辑控制开关打开和关断实 现 DFB激光器的突发模式控制。
突发控制通过输入高低逻辑电平控制开关和带宽选择电路， TTL (逻辑门电路 ransistor-Transistor Logic ) 高电平为 2.4~3.3V,低电平为 0~0.8V。 当输入为高电平 时， DFB激光器无输出， 同时带宽选择电路进入快速跟踪模式； 当输入为低电平 时， DFB激光器输出正常光信号， 同时带宽选择电路进入慢速跟踪模式， 以保证 输出光功率通过 APC回路稳定工作。
结合图 4， 为本发明的实施例 1和 2中的带宽选择电路的电路设计放大图， 带宽选择电路包括两个功能块， 一是高低带宽， 包括快速跟踪模式和慢速跟踪 模式； 另一个是延迟电路， 延迟电路的功能是将输入突发控制逻辑延迟 20ns， 可以让激光器在工作的前 20ns， APC环路能工作在快速跟踪模式， 即 APC能够 快速建立并激光器输出稳定功率， 然后 APC进入慢速跟踪模式， 保证不同码型 下激光器稳定工作。
其中， 电阻 Rl， R2和电容 C1为可选择的带宽参数， Rl、 switch— band和 CI , 构成快速跟踪电路； R2和 CI组成慢速跟踪电路。 RC的时间常数 R*C 的值越大， 跟踪速度越慢； RC的时间常数的值越小， 跟踪速度越快。
当开关闭合时， R1和 R2并联， 如 R1为 lOohm, 2为 200ohm， C1可为 O.OluF, 快速跟踪电路的 RC常数约为 R1*C1=0.1 ; 当开关打开时， 慢速跟踪电 路的 RC 常数为 R2*C1=2, 两者的跟踪速度相差 20倍， 但慢速跟踪电路能更好 的对输入信号进行平均， 使图发光信号在发光时输出光功率稳定。
图 5是本发明的逻辑控制时序图， 当 PON 系统输入逻辑即 ONU发光控制 逻辑为高时， ONU发射端即 ONU光输出送出光信号， 也就是如上所述在图 2 和图 3中 Sw ch 断开时， 激光驱动器正常工作使激光器发光， 同时在光信号输 出前 20ns, 带宽选择逻辑为低电平， 即图 4中 Switch CTR ( Switch control) 使得 Switch— band开关闭合，图 4 中的带宽跟踪电路处于快速跟踪模式；当 ONU 光输出稳定后，带宽选择逻辑置为高电平， 图 4中的 Switch CTR使 Switch— band 开关打开， 带宽跟踪电路处于慢速稳定跟踪模式， 并保证激光器能够稳定输出 光信号。
直到 PON 系统输入逻辑即 ONU发光控制逻辑置低， ONU发射端即 ONU 光输出， 关断激光器光信号输出， 图 2和图 3中 Switch 闭合， 激光器与二极光 管并联， 两端电压 /电流降低使激光器无光输出， 并且带宽跟踪电路处于快速跟 踪模式直到下一次 ONU光信号送出控制逻辑置高。
本发明不需要具有突发模式功能的激光驱动器， 激光驱动器一直工作在连 续模式， 但通过外部开关电路控制激光器快速响应。 特别是对于高速信号， 比 如 10G PON的应用， 没有突发模式激光驱动器的芯片支持，该方案能满足 PON 系统对 ONU的突发模式指标要求。 成本低， 实现简单， 对 DFB 和 EML激光 器都能使用。 通过开关和滤波电路实现带宽切换保证 APC环路快速建立和正常
° 工
6ZT180/M0ZN3/X3d 6ΪΪ000/9Ϊ0Ζ OAV

Claims

权 利 要 求 书
1.一种激光器突发控制电路，其特征在于，在 APC回路中添加突发控制电路， 所述突发控制电路包括：一个 Switch开关和二极管串联电路，再与激光器并联， 并通过外部逻辑控制 Switch开关打开和关断， 实现激光器的突发模式控制。
2、 根据权利要求 1所述的激光器突发控制电路， 其特征在于， 所述的外部 逻辑控制为： 通过输入高低逻辑电平控制 Switch开关和带宽选择电路。
3、 根据权利要求 2 中所述的激光器突发控制电路， 其特征在于， 所述的带 宽选择电路包括两个功能电路， 一是高低带宽选择电路， 另一个是延迟电路。
4、 根据权利要求 3 中所述的激光器突发控制电路， 其特征在于， 所述的高 低带宽选择电路包括两个模式， 快速跟踪模式和慢速跟踪模式。
5、 根据权利要求 2所述的激光器突发控制电路， 其特征在于， 所述的外部 逻辑控制通过输入高低逻辑电平控制 Switch开关和带宽选择电路时， 当输入为 高电平时， 激光器无光信号输出， 同时带宽选择电路进入快速跟踪模式； 当输 入为低电平时， 激光器输出正常光信号， 同时带宽选择电路进入慢速跟踪模式。
6、 根据权利要求 3 中所述的激光器突发控制电路， 其特征在于， 所述的延 迟电路的功能是将输入突发控制逻辑延迟，让激光器在工作前， APC环路能工作 在快速跟踪模式， APC 能够快速建立， 并使得激光器输出稳定功率， 然后 APC 进入慢速跟踪模式， 保证不同码型下激光器的稳定工作。
7. 一种激光器突发控制电路的控制方法，其特征在于，该方法为： 当 PON 系统输入逻辑即 ONU发光控制逻辑为高时， Switch开关处于断开状态， ONU 发射端即 ONU光输出送出光信号， 激光驱动器正常工作使激光器发光， 同时在 光信号输出前 20ns, 带宽选择逻辑为低电平， 带宽跟踪电路处于快速跟踪模式； 当 ONU光信号输出稳定后，带宽选择逻辑置为高电平，带宽跟踪电路处于 慢速稳定跟踪模式， 保证激光器能够稳定输出光信号； 直到 PON 系统输入逻辑即 ONU发光控制逻辑置低， Switch 开关处于闭合 状态， ONU发射端即 ONU光输出关断激光器光信号输出， 激光器与二极光管 并联， 两端电压 /电流降低使激光器无光输出， 并且带宽跟踪电路处于快速跟踪 模式直到下一次 ONU光信号送出控制逻辑置高。
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