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Study on microwave photonic filters based on lasers and dispersive fiber

Optoelectronics Letters 2007年第6期3卷 413-416页

作者： LIU Yu-yong FU Hong-yan Center for Optical and Electromagnetic Research State Key laboratory of Modern Optical Instrumentation Joint ResearchCenter of Optical Communications of Zhejiang University Zhejiang University Hangzhou 310058China

A general theoretical model for microwave photonic filters based on multi-wavelength light source and dispersive media is summarized and presented, and is applied to the analysis of double-laser-based microwave photonic notch filters’ performance. The different influences of the double-sideband(DSB) modulation and the single-sideband(SSB) modulation are demon- strated and explained theoretically. Furthermore, the impact of different factors, such as frequency spacing, 3dB bandwidth and the spectrum amplitude mismatch on the performance of the microwave photonic notch filters are also studied. The numerical simulation results are in good agreement with predictions, and could be beneficial for future optimization of microwave photonic filters.

关键词：光纤元件微波纤维激光扩散技术

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Tunable microwave photonic filter based on a fiber ring and erbium-doped fiber amplifier

引用

Optoelectronics Letters 2007年第6期3卷 406-409页

作者： FU Hong-yan OU Hai-yan CHEN Da-ru XIAO Yun HE Sai-ling Center for Optical and Electromagnetic Research State Key Laboratory of Modern Optical Instrumentation Joint Re-search Center of Optical Communications of Zhejiang University Zhejiang University Hangzhou 310058 China

The tunable microwave photonic filter based on a fiber ring and erbium-doped fiber amplifier （EDFA） was proposed. By introducing a section of erbium-doped fiber （EDF） into the fiber ring, the loss of the signal can be compensated by the EDFA gain through adjusting the pump power. This can largely increase the number of the effective sampling taps, and then improve the performance of the microwave photonic filter notably. When the pump power was set to be 42.7 roW, a microwave bandpass filter with the 3-dB bandwidth of 0.15 MHz, the Q factor up to 100 and extinction ratio up to 20 dB was achieved. By employing a tunable optical delay line in the above fiber ring, a tunable microwave photonic filter has been realized through tuning the length of the optical delay line. The proposed tunable microwave photonic filter can fred great applications in microwave signal processing and ROF system.

关键词：光纤元件微波纤维放大器纤维环

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