A5072292103- Advanced Photonic Communication Systems
- Advanced Fiber Laser Technologies
- Advanced Fiber Optic Sensors
- Full-Duplex Wireless Communications
- Optical Network Technologies
- Radar Systems and Signal Processing
Beijing Jiaotong University
2021-2023
A novel photonics-assisted method for tunable microwave frequency comb (MFC) generation based on an actively mode-locked optoelectronic oscillator (AML-OEO) is proposed and experimentally demonstrated in this letter. Two key factors the system, periodic gain modulation widely center frequency, are implemented by externally introduced intensity-modulated optical signal a photonic filter (MPF) phase-shifted fiber Bragg grating (PS-FBG) respectively. Unlike conventional OEO with only one...
Recently, optoelectronic oscillators (OEOs) have shown good behavior in microwave signal generation. In this letter, we propose a rational harmonic mode-locking OEO (RHML-OEO) to generate frequency combs (MFCs) with tunable comb intervals. By embedding an extra Mach–Zehnder modulator (MZM) into the cavity, intensity of oscillating mode can be modulated by applied on MZM, and sidebands having fixed phase differences are produced addition mode. A main feature RHML-OEO is that there detuning...
A photonic method for multi-band linearly frequency-modulated (LFM) signal generation is proposed and demonstrated experimentally. An intermediate-frequency (IF) LFM a single-tone radio frequency (RF) are first coupled by an electrical coupler. Then the coupling used to drive single-drive Mach–Zehnder modulator (SDMZM). By properly setting frequencies corresponding modulation indices of IF RF signal, can be generated. The number sub-bands adjusted simply controlling direct current bias...
Frequency modulated continuous wave (FMCW) radars with de-chirping receivers can achieve high resolution and real-time microwave imaging. However, the inherent leakage interference from transmitter to receiver image frequencies will degrade sensitivity dynamic range of receiving system. In this paper, a novel photonic-assisted down-converter based on dual-polarization binary phase-shift keying (DP-BPSK) modulator, which cancellation rejection concurrently for wideband linear frequency (LFM)...
A novel photonic-assisted multifunctional radar is proposed for simultaneous measurement of the distance, velocity, and direction target. In this scheme, a dual-polarization binary phase shift keying (DP-BPSK) modulator used to implement parallel de-chirping process echo signals received by two distributed receiving antennas. By applying composite signal that combines linear frequency modulated (LFM) single-frequency microwave as transmitted signal, target under test can be derived analyzing...