Opt Lett. 2013 Nov 15;38(22):4900-2. doi: 10.1364/OL.38.004900.
A novel approach to increase the measurement range of the optical vector network analyzer (OVNA) based on optical single-sideband (OSSB) modulation is proposed and experimentally demonstrated. In the proposed system, each comb line in an optical frequency comb (OFC) is selected by an optical filter and used as the optical carrier for the OSSB-based OVNA. The frequency responses of an optical device-under-test (ODUT) are thus measured channel by channel. Because the comb lines in the OFC have fixed frequency spacing, by fitting the responses measured in all channels together, the magnitude and phase responses of the ODUT can be accurately achieved in a large range. A proof-of-concept experiment is performed. A measurement range of 105 GHz and a resolution of 1 MHz is achieved when a five-comb-line OFC with a frequency spacing of 20 GHz is applied to measure the magnitude and phase responses of a fiber Bragg grating.
提出并实验验证了一种基于光单边带（OSSB）调制的新型方法来增加光矢量网络分析仪（OVNA）的测量范围。在该系统中，通过光学滤波器选择光频梳（OFC）中的每个梳线，并将其用作基于 OSSB 的 OVNA 的光载波。因此，逐个通道测量光被测器件（ODUT）的频率响应。由于 OFC 中的梳线具有固定的频率间隔，通过拟合所有通道中测量到的响应，可以在很大的范围内准确地获得 ODUT 的幅度和相位响应。进行了一个概念验证实验。当应用具有 20GHz 频率间隔的五梳线 OFC 来测量光纤布拉格光栅的幅度和相位响应时，实现了 105GHz 的测量范围和 1MHz 的分辨率。
