25 Gbit/s CMOS直接调制DFB激光器驱动电路

发布时间:2017-10-09 作者:石泾波,祁楠,Patrick Yin CHIANG 阅读量:

[摘要] 提出了一个基于互补金属氧化物半导体(CMOS)65 nm工艺、可用于100 G直接调制光互连系统的激光器驱动电路,此电路可以以差分形式驱动分布反馈式(DFB)激光二极管(LD)并使其在25 Gbit/s的速率下工作。电路采用了预加重技术即通过电容耦合的方式将一系列精确控制的脉冲信号输出到负载,从而减小由于阻抗不匹配所导致的数据损耗。此外,电路还包括了线性连续时间均衡(CTLE)电路和并联电感峰化电路来扩展信号的带宽。测试结果表明:此驱动器电路可以为激光器提供60 mApp的调制电流和60 mA的偏置电流(DC),获得1.2 mW光输出功率,电路的功耗为480 mW。同时,还观测到了25 Gbit/s的眼图,消光比为4.4 dB和抖动2.9 ps。

[关键词] 直接调制;DFB驱动电路;电容耦合

[Abstract] The laser drive circuit in 65 nm complementary metal oxide semiconductor (CMOS) is proposed in this paper, which can be used for 100 G direct modulation optical interconnection system. This circuit can drive distributed feedback (DFB) laser diodes (LD) to operate in differential forms at a rate of 25 Gbit/s. To suppress the data reflection due to discontinuous loading impedance, a shifted pulse pre-emphasis technique is proposed, which precisely generates the pulse from a tunable delay line, and delivers it to the load through capacitive coupling. Linear continuous time linear equalization (CTLE) and inductive shunt peaking are adopted to further extend the signal-path bandwidth. Measurement results show that the driver can provide 60 mApp modulation current with additional 60 mA direct current (DC) bias to the laser, which leads to 1.2 mW optical output power, and 480 mW power consumption. The 25 Gbit/s clean eye-diagrams is also observed, with 4.4 dB extinction rate (ER) and 2.9 ps jitter.

[Keywords] directly modulated; DFB driver; capacitively-coupled

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