Abstract
A novel Doppler frequency shift (DFS) measurement system based on a cascaded modulator topology is presented. It is capable to measure both the object speed and moving direction on an electrical spectrum analyzer with the use of a fixed low-frequency reference signal. It has a simple single-laser and single-photodetector structure, a robust performance and a wide operating frequency range, which is only limited by the optical modulator bandwidth. Experimental results are presented that demonstrate DFS ranging from -100 kHz to +100 kHz with an error of less than ±0.1 Hz at different microwave signal frequencies. Over 35 dB suppression in unwanted frequency components present at the system output is also demonstrated.
Original language | English |
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Article number | 8836666 |
Pages (from-to) | 1643-1646 |
Number of pages | 4 |
Journal | IEEE Photonics Technology Letters |
Volume | 31 |
Issue number | 20 |
DOIs | |
Publication status | Published - 15 Oct 2019 |