Photonic approach to microwave frequency measurement with extended range based on phase modulation

• 来源期刊: 中国光学快报（英文版）
• 年，卷（期）: 2013,（5）
• 页码范围: 20-24
• 页数: 5页
• 语种: 英文
• DOI: 10.3788/COL201311.050604

摘要

We propose and demonstrate a photonic approach to instantaneous frequency measurement with an extended range based on phase modulation.In the measurement system,two optical wavelengths and two dispersion fiber segments are used to construct the frequency-dependent amplitude comparison functions (ACFs).Several ACFs can be utilized jointly to determine the microwave frequency without ambiguities beyond a monotonic region of the lone conventional ACF.The measurable range of microwave frequency can be extended and the accuracy can be improved by selecting an ACF with a large slope.The experimental results show that the errors are limited within ±140 MHz of a frequency measuremental range from 8 to 20 GHz.