Design of driving circuit of multi-channel semiconductor laser
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摘要: 为了可切换多个半导体激光器，实现分时工作，并降低驱动电路的体积，采用多路选择开关和多路模拟开关，实现激光二极管和光敏二极管的切换，通过设置数模转换芯片不同工作点电压，实现了一种可以驱动多路不同型号激光二极管的电路。进行了理论分析和实验验证，取得了长时间稳定性测试数据。结果表明，电路恒流输出精度可达0.005%，驱动830nm激光二极管的输出功率不稳定度为0.048%，驱动1550nm激光二极管的输出功率不稳定度为0.046%，实现了光源的稳定输出。这一结果对实现小体积的多路半导体激光器驱动电路设计是有帮助的。Abstract: In order to switch multiple semiconductor lasers, realize time-sharing work, and reduce the volume of driving circuit, multi-channel selection switch and multi-channel analog switch was used to switch laser diode and photodiode. Different working voltages were set by digital to analog conversion chip. A circuit that can drive multiple different types of laser diodes was achieved. After theoretical analysis and experimental verification, stability test data with long time were obtained. The results indicate that, the output precision of constant current circuit can reach 0.005%, the instability of output power of laser diode with 830nm is 0.048%, and the instability of output power of laser diode with 1550nm is 0.046%. A stable light source is achieved. This result is helpful for the design of small volume drive circuit of multi channel semiconductor lasers.
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Keywords:
- laser technique /
- semiconductor laser /
- constant current driver /
- analog switch
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