双环功率控制的突发模式激光驱动器

Burst-mode laser diode driver with dual-loop power control

设计了一款应用于无源光网络(PON)的突发模式激光驱动器及其双环功率控制电路。提出一种电荷补偿和动态偏置电路,减小了激光驱动器电流上升和下降时间,提高了输出电流能力;提出一种双环功率控制的反馈电路,解决了平均功率和消光比随温度变化的问题。基于0.18μm RF CMOS工艺完成流片,激光驱动器芯片面积为1 600μm×800μm。测试结果表明,激光驱动器的输出偏置电流和调制电流分别可达90 m A。激光驱动器突发响应开启时间小于2 ns,关断时间小于1 ns,发送数据速率高达2.5 Gbit/s,抖动大小为41 ps。激光驱动器输出平均光功率稳定性为±0.26 d B,消光比稳定性为±1 d B。该激光驱动器满足了PON系统对激光器的输出功率和稳定性要求。

A burst-mode laser diode driver （LDD） with dual-loop power control circuit was designed for the passive optical network （PON） applications. The charge compensation and dynamic bias circuit was employed to reduce the rising and failing time of the output current and enlarge the output current capability. A dual-loop power control feedback circuit was proposed to avoid the variations of average power and the extinction ratio with temperature. The proposed laser diode driver was implemented in a 0.18 ixm RF CMOS technology and the chip area was 1 600 p^mxS00 p^m. Experiment results show that the output bias current and the modulating current can reach 90 mA. The burst-on time of the LDD is less than 2 ns and the burst-off time is less than 1 ns with 2.5 Gbit/s data transmitting rate and 41 ps magnitude. The average power stability and the extinction ratio stability of the LDD is ±0.26 dB and±1 dB, respectively. The proposed LDD meets the needs of the optical power and stability of the laser for PONs.