External Modulation Method for Generating Accurate Linear Optical FMCW
External Modulation Method for Generating Accurate Linear Optical FMCW
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DOI：
10.1109/lpt.2017.2736561
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发表时间：
2017-09
影响因子：
2.6
通讯作者：
Yingkai Lyu;Tianxin Yang;Z. Lu;Cheng Guo;Chunfeng Ge;Zhaoying Wang;Dongfang Jia;Huabing Yin
中科院分区：
文献类型：
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作者：
Yingkai Lyu;Tianxin Yang;Z. Lu;Cheng Guo;Chunfeng Ge;Zhaoying Wang;Dongfang Jia;Huabing Yin
调频连续波(FMCW)激光器是现代光学成像的关键器件。然而，由于固有的弛豫振荡，目前的内腔调制激光器没有表现出低频率抖动率和高线性度。虽然在使用光电反馈环路的直接调制激光二极管中可以补偿这一点，但可用的扫描速度是适度小的。为了提高FMCW的性能，本文提出了一种特殊的外调制方法。由于在整个产生过程中只使用第一边带光场，因此将相位噪声保持在最小，并且也与扫描速度无关。我们证明，当扫描速度变化超过三个数量级时，线性度和抖动率没有明显的恶化，即使最高扫描速度为2.5千兆赫/亩{S}}。
Frequency modulation continuous wave (FMCW) lasers are key components in modern optical imaging. However, current intracavity modulation lasers do not exhibit low-frequency jitter rate and high linearity due to the inherent relaxation oscillations. Although this may be compensated in a direct modulation laser diode using an optoelectronic feedback loop, the available sweep speed is moderately small. In this letter, a special external modulation method is developed to improve the performance of FMCW. Since only the first sideband optical field is used during the entire generation process, phase noise is kept to a minimum and is also independent of the sweep speed. We demonstrate that the linearity and jitter rates do not deteriorate appreciably when the sweep speed is changed over three orders of magnitude, even up to the highest sweep speed of 2.5 GHz/ $\mu \text{s}$ .