Liu Shifeng, Xue Min, Fu Jianbin, Wu Lugang, Pan Shilong
Opt Lett. 2018 Feb 15;43(4):727-730. doi: 10.1364/OL.43.000727.
An ultrahigh-resolution and wideband optical vector analyzer (OVA) with the simplest architecture, to the best of our knowledge, is proposed and demonstrated based on chirped optical double-sideband (ODSB) modulation in a single-drive Mach-Zehnder modulator (MZM). To distinguish the magnitude and phase information carried by the two sidebands in the ODSB signal, a two-step measurement, in which biasing, respectively, the MZM at two different points is applied. Because no optical filtering is required in the scheme, the optical carrier can be located at any wavelength that is suitable for accurate measurement, e.g., close to the notch of a notch response or within the passband of a bandpass response, so the proposed OVA has the capability to measure an arbitrary response. An experiment is carried out, which achieves the magnitude and phase responses of a programmable optical processor with bandpass, notch, or falling-edge responses. The measurement bandwidth is 134 GHz, and the measurement resolution is 1.12 MHz.
据我们所知，基于单驱动马赫-曾德尔调制器（MZM）中的啁啾光学双边带（ODSB）调制，提出并演示了一种具有最简单架构的超高分辨率宽带光学矢量分析仪（OVA）。为了区分ODSB信号中两个边带所携带的幅度和相位信息，采用了两步测量法，即在两个不同点分别对MZM进行偏置。由于该方案不需要光学滤波，光载波可以位于适合精确测量的任何波长处，例如靠近陷波响应的陷波点或在带通响应的通带内，因此所提出的OVA能够测量任意响应。进行了一项实验，该实验实现了具有带通、陷波或下降沿响应的可编程光学处理器的幅度和相位响应。测量带宽为134 GHz，测量分辨率为1.12 MHz。
