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基于法拉第旋转镜的相位可调光电振荡器
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作者 滕义超 张宝富 +2 位作者 周瑞婷 王庆国 王华力 《光电子.激光》 EI CAS CSCD 北大核心 2015年第4期639-643,共5页
为了有效实现光电振荡器(OEO)输出信号相位可调,提出了一种基于法拉第旋转镜的OEO。利用放大器和滤波器构成电增益环腔,电增益环腔、直接调制半导体激光器(DFB-LD)和光电检测器构成OEO环路。通过光分路器得到经过调制后的光信号,结... 为了有效实现光电振荡器(OEO)输出信号相位可调,提出了一种基于法拉第旋转镜的OEO。利用放大器和滤波器构成电增益环腔,电增益环腔、直接调制半导体激光器(DFB-LD)和光电检测器构成OEO环路。通过光分路器得到经过调制后的光信号,结合级联光环形器和法拉第旋转镜结构,改变级联法拉第旋转镜的个数,可以对应得到相位延迟90~360°的射频(RF)信号,在实验结构简单的条件下,有效实现了OEO输出信号的相位调谐。实验结果表明,每增加一组光环形器和法拉第旋转镜结构,输出的RF信号相位延迟90°。当光纤长为2km,电增益环腔长为0.5 m时,得到频率为10.8GHz、边模抑制比大于50dB和相位噪声为-104.8dBc/Hz@10kHz的RF信号。 展开更多
关键词 光电振荡器(OEO) 电增益环腔 相位可调谐 法拉第旋转镜
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Microwave photonic bandpass filter based on spectrum-slicing and phase modulator 被引量:2
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作者 靳胜才 张爱玲 《Optoelectronics Letters》 EI 2011年第2期113-116,共4页
A tunable microwave photonic bandpass filter with high mainlobe-to-sidelobe ratio (MSR) based on a phase modulator and a dispersive device is proposed. The multi-tap characteristics of the filter are realized by slici... A tunable microwave photonic bandpass filter with high mainlobe-to-sidelobe ratio (MSR) based on a phase modulator and a dispersive device is proposed. The multi-tap characteristics of the filter are realized by slicing a broadband source using a Mach-Zehnder interferometer (MZI) which results in a high MSR of 25 dB. The tunability of the filter is realized by an optical variable delay line (OVDL) in one arm of the MZI, which changes the wavelength spacing of the sliced broadband source and results in a tunable free spectrum range (FSR) of the filter. The central frequency of the bandpass filter is tunable from 10.7 GHz to 27 GHz by changing the wavelength spacing from 0.145 nm to 0.054 nm. 展开更多
关键词 Bandpass filters Modulators Phase modulation
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Dual-band bandpass tunable microwave photonic filter based on stimulated Brillouin scattering 被引量:3
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作者 李嘉琪 肖永川 +1 位作者 董玮 张歆东 《Optoelectronics Letters》 EI 2016年第4期276-279,共4页
A dual-band bandpass microwave photonic filter(MPF) based on stimulated Brillouin scattering(SBS) is theoretically analyzed and experimentally demonstrated. Two separated tunable laser sources(TLSs) are employed to ge... A dual-band bandpass microwave photonic filter(MPF) based on stimulated Brillouin scattering(SBS) is theoretically analyzed and experimentally demonstrated. Two separated tunable laser sources(TLSs) are employed to generate two passbands by implementing phase modulation to amplitude modulation conversion by using SBS induced sideband amplification. The center frequencies of both passbands can be independently tuned ranging from 1 GHz to 19 GHz. High resolution with 3 d B bandwidth less than 30 MHz and large out-of-band rejection about 40 d B under 25 m W optical pump power are achieved. 展开更多
关键词 Bandpass filters Brillouin scattering Microwave filters MODULATION Optical pumping Phase modulation Surveying instruments
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