基于微波光子學的微波信號生成技術研究
[Abstract]:Microwave photonics is a new technique to produce, transmit and process microwave signal by optical method. Compared with traditional electronic technology, microwave photonic technology has the advantages of low loss, large bandwidth, small volume and weight, anti-electromagnetic interference and so on. The optical generation technology of microwave signal is an important research content in microwave photonics. In this thesis, we focus on the following two aspects: 1, microwave local oscillator doubling technology based on microwave photonics, and triangle wave signal generation technology based on microwave photonics. In this paper, several common electro-optic modulators are introduced, and their structure and working principle are analyzed theoretically. Using VPI software, three modulation modes of (DSB), single sideband (SSB) and suppression carrier two-sided band (OCS-DSB) are simulated and analyzed, and the definitions of three performance indexes, namely, optical harmonic suppression ratio (OSSR), electric harmonic suppression ratio (RFSSR) and phase noise, are introduced. Secondly, an optical octave scheme of microwave signal based on dual polarization-orthogonal phase shift keying (DP-QPSK) modulator is studied, and the simulation analysis and experimental verification of the scheme are carried out. The experimental results show that the photoharmonic suppression ratio is 10.28 dB, the electric harmonic suppression ratio is 12.68 dB, and the phase noise deterioration at each frequency offset is about 18 dB, which is consistent with the theoretical results. Because no optical filter or electric filter is used in this scheme, it not only simplifies the circuit, but also makes it easy to operate. The most important thing is that the frequency tunability of the scheme is very good. In the process of the experiment, the frequency doubling experiments are carried out using the radio frequency signals of 3 GHz, 4.5 GHz and 5 GHz and four frequencies of 6GHz, and the ideal spectrum is obtained. At the same time, a scheme of generating triangular wave signal using phase modulator (PM) and fiber Bragg grating (FBG) (FBG) is studied, and the scheme is simulated and analyzed. In the simulation, the 3GHz driving signal is used to phase modulate the optical carrier. When the suppression ratio of the FBG to the optical carrier and the first (or negative) optical side band is both 6dBand the modulation index is set to 0.68, the second harmonic is suppressed after the beat. The power difference between the first harmonic and the third harmonic is 19.12dB (the amplitude ratio of the first harmonic to the third harmonic is 9:1), and the triangle wave signal with repetition frequency of 3 GHz is produced. When the FBG to the optical carrier and the positive (or negative first order) optical sideband suppression ratio is 4 dB, the modulation index is set to 0.75, the second harmonic is suppressed after beat frequency. Moreover, the power difference between the first harmonic and the third harmonic is 19.06dB (the amplitude ratio of the first harmonic to the third harmonic is 9:1), and the triangle wave signal with repetition frequency of 3GHz is produced.
【學位授予單位】:西安電子科技大學
【學位級別】:碩士
【學位授予年份】:2015
【分類號】:TN015;TN761
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