Zou Xihua, Pan Wei, Luo Bin, Yan Lianshan, Jiang Yushi
School of Information Science and Technology, Southwest Jiatong University, Chengdu 610031, China.
Opt Express. 2011 Oct 10;19(21):20580-5. doi: 10.1364/OE.19.020580.
A photonic approach to measuring microwave frequency with digital results is proposed and experimentally demonstrated. In the proposed approach, N photonic phase-shifted filters with a phase shift increment of π/N in the transmission responses are designed. The filters are then employed to process the single optical sideband generated by applying a microwave signal to a single sideband suppressed-carrier (SSB-SC) modulation module, to perform frequency-to-amplitude conversion and analog-to-digital conversion simultaneously. After the implementation of power detection and decision operation to the filtered optical sideband, an N-bit result in the form of the circular code is obtained, which indicates the frequency of the microwave signal. A proof-of-concept experiment is performed to verify the proposed approach and a 5-bit circular code is generated to indicate microwave frequency up to 40 GHz.
提出并通过实验证明了一种用于测量微波频率并获得数字结果的光子学方法。在所提出的方法中，设计了N个光子相移滤波器，其传输响应中的相移增量为π/N。然后，这些滤波器用于处理通过将微波信号施加到单边带抑制载波（SSB-SC）调制模块而产生的单个光学边带，以同时执行频率到幅度转换和模数转换。对滤波后的光学边带进行功率检测和判决操作后，可获得循环码形式的N位结果，该结果表示微波信号的频率。进行了概念验证实验以验证所提出的方法，并生成了一个5位循环码来表示高达40 GHz的微波频率。
