Qing Ting, Li Shupeng, Tang Zhenzhou, Gao Bindong, Pan Shilong
Key Laboratory of Radar Imaging and Microwave Photonics, Ministry of Education, Nanjing University of Aeronautics and Astronautics, Nanjing, 210016, China.
Nat Commun. 2019 Nov 13;10(1):5135. doi: 10.1038/s41467-019-13129-x.
Optical vector analysis (OVA) capable of achieving magnitude and phase responses is essential for the fabrication and application of emerging optical devices. Conventional OVA often has to make compromises among resolution, dynamic range, and bandwidth. Here we show an original method to meet the measurement requirements for ultra-wide bandwidth, ultra-high resolution, and ultra-large dynamic range simultaneously, based on an asymmetric optical probe signal generator (ASG) and receiver (ASR). The ASG and ASR remove the measurement errors introduced by the modulation nonlinearity and enable an ultra-large dynamic range. Thanks to the wavelength-independence of the ASG and ASR, the measurement range can increase by 2 N times by applying an N-tone optical frequency comb without complicated operation. In an experiment, OVA with a resolution of 334 Hz (2.67 attometer in the 1550-nm band), a dynamic range of > 90 dB and a measurement range of 1.075 THz is demonstrated.
能够实现幅度和相位响应的光矢量分析（OVA）对于新型光学器件的制造和应用至关重要。传统的OVA通常必须在分辨率、动态范围和带宽之间做出妥协。在此，我们展示了一种基于非对称光学探测信号发生器（ASG）和接收器（ASR）的原创方法，能够同时满足超宽带宽、超高分辨率和超大动态范围的测量要求。ASG和ASR消除了调制非线性引入的测量误差，并实现了超大动态范围。由于ASG和ASR与波长无关，通过应用N频光频梳，无需复杂操作，测量范围即可增加2N倍。在一项实验中，展示了分辨率为334Hz（1550nm波段中为2.67飞米）、动态范围>90dB且测量范围为1.075THz的OVA。
