Analysis of corrugated long-period gratings in slab waveguides and their polarization dependence
Analysis of corrugated long-period gratings in slab waveguides and their polarization dependence
复制标题
平板波导中波纹长周期光栅及其偏振依赖性分析
DOI：
10.1109/jlt.2003.821749
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发表时间：
2003
影响因子：
4.7
通讯作者：
V. Rastogi
中科院分区：
文献类型：
--
作者：
Qing Liu;K. Chiang;V. Rastogi
从理论上分析了平板波导中波纹长周期光栅的光传输特性。光栅的透射光谱在特定波长处显示出不同的抑制带，称为谐振波长。我们详细研究了光栅的相位匹配曲线，它决定了谐振波长与光栅周期之间的关系。由于波导参数选择的灵活性，长周期波导光栅的相位匹配曲线可以与长周期光纤光栅（LPFG）的相位匹配曲线有着不同的特性，这意味着前者可以表现出比后者更丰富的特性。与LPFG不同，长周期波导光栅的透射光谱通常对光的偏振敏感。然而，波导和光栅参数的适当选择可以导致偏振无关的抑制带。长周期波导光栅在集成光波导器件和传感器中有着广泛的应用前景。
We analyze theoretically the light transmission characteristics of corrugated long-period gratings formed in slab waveguides. The transmission spectra of the gratings show distinct rejection bands at specific wavelengths, known as the resonance wavelengths. We investigate in detail the phase-matching curves of the gratings, which govern the relationship between the resonance wavelength and the grating period. Thanks to the flexibility in the choice of the waveguide parameters, the phase-matching curves of a long-period waveguide grating can be different characteristically from those of a long-period fiber grating (LPFG), which implies that the former can exhibit much richer characteristics than the latter. Unlike an LPFG, the transmission spectrum of a long-period waveguide grating is in general sensitive to the polarization of light. Nevertheless, a proper choice of the waveguide and grating parameters can result in a polarization-independent rejection band. Long-period waveguide gratings should find potential applications in a wide range of integrated-optic waveguide devices and sensors.