Jun Wen, Wang Ling, Yang Chengwu, Li Ming, Zhu Ning Hua, Guo Jinjin, Xiong Liangming, Li Wei
Opt Lett. 2017 Nov 1;42(21):4426-4429. doi: 10.1364/OL.42.004426.
We report an optical vector network analyzer (OVNA) based on double-sideband (DSB) modulation using a dual-parallel Mach-Zehnder modulator. The device under test (DUT) is measured twice with different modulation schemes. By post-processing the measurement results, the response of the DUT can be obtained accurately. Since DSB modulation is used in our approach, the measurement range is doubled compared with conventional single-sideband (SSB) modulation-based OVNA. Moreover, the measurement accuracy is improved by eliminating the even-order sidebands. The key advantage of the proposed scheme is that the measurement of a DUT with bandpass response can also be simply realized, which is a big challenge for the SSB-based OVNA. The proposed method is theoretically and experimentally demonstrated.
我们报道了一种基于双边带（DSB）调制的光学矢量网络分析仪（OVNA），该调制使用双并行马赫-曾德尔调制器。被测设备（DUT）使用不同的调制方案进行两次测量。通过对测量结果进行后处理，可以准确获得DUT的响应。由于我们的方法中使用了DSB调制，与传统的基于单边带（SSB）调制的OVNA相比，测量范围扩大了一倍。此外，通过消除偶数阶边带提高了测量精度。所提方案的关键优势在于，对于具有带通响应的DUT的测量也能简单实现，而这对基于SSB的OVNA来说是一个巨大挑战。所提方法在理论和实验上均得到了验证。
