Abstract

The effect of the coherence time of the semiconductor laser emitter incorporated in the most commonly used optoelectronic radio signal processor (OERSP) based on a multitapped optical delay circuit (ODC) on the transmission gain and signal-to-noise ratio at the device output is studied by computer simulation in a widely used optoelectronic CAD tool. It is found that efficient operation of a practical device implies that its coherence time should be shorter than the duration of the processed radio-frequency signal at least by an order of magnitude. Measurements of coherence times of three most commonly used modern emitters: the external-cavity-based laser, distributed feedback laser, and Fabry—Perot laser show that only the latter type can be efficiently used as a part of the studied OERSP with a four-tapped ODC based on 7-core optical fiber.

中文翻译：

---

半导体激光发射器的相干时间对光电延迟线处理器中无线电信号处理质量的影响

摘要

基于多抽头光学延迟电路（ODC）的，最常用的光电无线电信号处理器（OERSP）中包含的半导体激光发射器的相干时间对设备输出处的传输增益和信噪比的影响是在广泛使用的光电CAD工具中通过计算机仿真进行研究。发现实用设备的有效运行意味着其相干时间应比处理后的射频信号的持续时间短至少一个数量级。对三种最常用的现代发射器（基于外腔的激光器，分布式反馈激光器和Fabry-Perot激光器）的相干时间进行的测量表明，只有后一种类型的发射器可以有效地用作研究的OERSP的一部分，而四发射器基于7芯光纤的ODC抽头。