期刊
JOURNAL OF LIGHTWAVE TECHNOLOGY
卷 36, 期 13, 页码 2589-2596出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JLT.2018.2817506
关键词
Instantaneous frequency measurement (IFM); linear frequency modulation (LFM); microwave photonics; optical linear filter; polarization modulation
资金
- National Natural Science Foundation of China [61605077, 61422108, 61527820]
- Fundamental Research Funds from the Central Universities
A novel approach for simultaneous and instantaneous measurement of the center frequency (CF), bandwidth (BW), pulse width (PW), pulse amplitude (PA), and time of arrival (TOA) of a linear frequency modulation (LFM) pulse signal is proposed and experimentally demonstrated. The approach is based on a linear amplitude comparison function (ACF) obtained by intensity modulation and first-order differentiated phase modulation, which are realized using a polarization modulator, two polarizers, and an optical linear filter. The linearity characteristic of the ACF ensures the ability of the proposed system to measure multiple parameters of anLFM pulse signal. In a proof-of-concept experiment, the measurement errors for CF, BW, PW, PA, and TOA of an LFM pulse are within +/- 0.3 GHz, +/- 0.4 GHz, +/- 120 ps, +/- 50 mV, and +/- 15 ps, respectively. Factors affecting the performance of the measurement system, such as the shape, slope, and resolution of the ACF, are discussed.
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