激光与光电子学进展, 2013, 50 (3): 032202, 网络出版: 2012-12-27  

低偏振相关损耗塑料矩形相位光栅的实验研究

Experimental Research on Low Polarization-Dependent Loss Plastic Rectangular Phase Grating
作者单位
华侨大学信息科学与工程学院 , 福建 厦门 361021
摘要
塑料矩形相位光栅波分复用器可有效利用塑料光纤的带宽资源,提高城域接入网的有效接入带宽。推导了在最佳入射角下,基于矢量衍射理论求解的矩形相位光栅-1级衍射效率公式,数值模拟了TE/TM偏振的有效模指数与光栅常数的关系。模拟结果表明,折射率为1.58、占空比为0.5的矩形相位光栅在入射波长为1.5 μm的入射光波照射下,TE/TM偏振能够同时达到最高衍射效率所对应的最佳光栅常数为0.82 μm,刻槽深度为1.8 μm。实际测量了不同入射角下,塑料矩形相位光栅的归一化衍射光强与入射角的关系,研究结果表明,在最佳入射角条件下,塑料矩形相位光栅的偏振相关损耗可低于0.5 dB。
Abstract
Plastic rectangular phase grating wavelength division multiplexing (WDM) device can effectively use plastic optical fiber bandwidth resources and improve the effective bandwidth of metro access network. The formula of the negative first-order diffraction efficiency is derived by using rigorous coupled-wave analysis in the optimum incident angle and the grating effective modal index varying with grating period is numerically simulated. Simulation results indicate that when the rectangular phase grating with refractive index of 1.58 and duty cycle of 0.5 is illuminated by 1.5 μm light, the negative first-order diffraction efficiencies for both TE and TM polarized waves can reach the maximum simultaneously under the conditions of the optimum grating period of 0.82 μm and the minimum groove depth of 1.47 μm. The normalized diffraction optical intensity is measured for different incident angles. The experiment result shows that, with the optimum incidence, the polarization dependence loss of the plastic rectangular phase grating can be lower than 0.5 dB.

林宝卿, 翟云, 庄其仁. 低偏振相关损耗塑料矩形相位光栅的实验研究[J]. 激光与光电子学进展, 2013, 50(3): 032202. Lin Baoqing, Zhai Yun, Zhuang Qiren. Experimental Research on Low Polarization-Dependent Loss Plastic Rectangular Phase Grating[J]. Laser & Optoelectronics Progress, 2013, 50(3): 032202.

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