光纤光栅群时延纹波对微波光子滤波性能的影响

建立了一种研究光纤光栅群时延纹波(GDR)对微波光子滤波性能影响的理论模型，探讨了群时延纹波对相干光源型和非相干光源型微波光子滤波器性能的影响。基于该理论模型，分别在随机分布的GDR和实测GDR影响下，分析了微波光子滤波器幅频响应、相频响应的演变趋势。相干光源型滤波器中，GDR主要影响体现为陷波点频率的偏移，而非相干光源型滤波器中GDR则导致幅频响应形状和线性相位畸变；而在多抽头情形下，GDR导致边模抑制比下降和消光比劣化。

Abstract

A theoretical model is established to investigate the influences of the group delay ripples (GDRs) of the fiber Bragg grating (FBG) on the characteristics of microwave-photonic filters using a coherent light source or an incoherent light source. Based on this theoretical model, the amplitude-frequency response and phase-frequency response of the microwave-photonic filter are investigated, while random and measured GDR distributions are employed. Results are then achieved for both coherent light source based and incoherent light source based microwave filters. For the coherent light source based filters, the GDRs result in a frequency shift to the notches of amplitude-frequency response. While for the incoherent light source based filters, the distortions to the profile of amplitude-frequency response and to the linear phase are observed due to the existence of GDRs. In addition, for the multi-tap microwave filters, the side-band suppression ratio and the extinction ratio are degraded under the influence of GDRs.

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戈伟伟, 邹喜华, 何梓昂, 潘炜, 罗斌, 闫连山. 光纤光栅群时延纹波对微波光子滤波性能的影响[J]. 强激光与粒子束, 2013, 25(1): 12. Ge Weiwei, Zou Xihua, He Ziang, Pan Wei, Luo Bin, Yan Lianshan. Influences of group delay ripples of fiber gratings on characteristics of microwave photonic filter[J]. High Power Laser and Particle Beams, 2013, 25(1): 12.

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