带恒定消光比控制1.25Gbps激光器驱动器的研究

Research and Design of the 1.25Gbps Laser Diode Driver with Extinction Ratio Control

设计了一个边缘发光激光二极管驱动器芯片。芯片集成自动功率控制和调制电流的可编程温度补偿功能以提供恒定的光功率输出和稳定的消光比。在0.35μm BiCMOS工艺下的仿真结果表明,该电路在3.3V工作电压下,在-40℃～85℃的温度范围内,通过片外编程,可调节偏置电流的幅度达4～100mA,调制电流的幅度达5～80mA,调制电流的温度补偿起点可从150C到700C变化,温度补偿的斜率可从4*10-4/0C到1.5*10-2/0C变化。该芯片可应用于速率为1.25Gbps的光纤传输系统中。

An integrated Laser Diode Driver (LDD) driving an Edge-emitting laser has been designed. The IC can provide both modulation current (5～85mA) with temperature compensation adjustments to minimize the variation in extinction ratio, and independent bias current (4～100mA) with automatic power control. Under the 0.35μm BiCMOS technology, simulation results show that, through programming outside the IC, the range for modulation current temperature coefficient can be adjusted from 410-4/0C to 1.510-2/0C and programmable temperature at which modulation current compensation enables 150C to 700C. This IC could be used in 1.25Gbps fiber-optical transmission system.