| 正弦波调制技术在光损耗测试仪中的应用 |
| 投稿时间：2019-04-16 修订日期：2019-05-13 点此下载全文 |
| 引用本文：孙强,张爱国.正弦波调制技术在光损耗测试仪中的应用[J].红外,2019,40(5):23~27 |
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| 中文摘要:针对传统光损耗测试仪存在预热时间长、温度变化对红外光源输出功率变化影响较大等不足，提出了用正弦波信号对红外光源进行调制的方案。此方法有效解决了这些问题，获得了较好的测试效果。首先，介绍了三种正弦波信号的产生方法，其中直接数字式频率合成(Direct Digital Synthesis, DDS)方法产生的正弦波具有较高的频率分辨率和频率稳定度。其次，介绍了DDS芯片AD9832的内部构造及转换原理，将其产生的正弦波信号应用到光损耗测试仪中。比较了正弦波信号调制前后以及预热前后红外光源功率的变化情况。结果表明，经过正弦波调制的红外光源的稳定性明显优于调制前，用户能更方便地进行快速光损耗测试 |
| 中文关键词:直接数字频率合成 AD9832 光损耗测试 |
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| Application of Sinusoidal Wave Modulation Technology in Optical Fiber Loss Tester |
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| Abstract:In view of the shortcomings of the traditional optical fiber loss tester, such as long preheating time and great influence of temperature change on the output power of the infrared light source, a scheme of modulating the infrared light source with sine wave signal was proposed. This method can effectively solve these problems and achieve good test results. Firstly, three kinds of sinusoidal wave signal generation methods were introduced, among which the direct digital frequency synthesis (DDS) method produces sinusoidal wave with high frequency resolution and frequency stability. Secondly, the internal structure and conversion principle of DDS chip AD9832 were introduced. The sinusoidal wave signal generated by the DDS chip was applied to the infrared optical loss tester. The changes of the infrared light source power before and after the sine wave signal modulation and before and after the preheating were compared. The results show that the stability of infrared light source after sinusoidal wave modulation is better than that before modulation, and it is more convenient for users to quickly measure the optical fiber loss. |
| keywords:direct digital frequency synthesis AD9832 optical fiber loss measurement |
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