啁啾布喇格光栅法布里-珀罗滤波器

Chirped Bragg grating Fabry-Perot filter

为了获得窄的自由光谱范围和可控的精细度,采用了将平行双通道波导用啁啾布喇格光栅完全反向耦合,在耦合区入口处制作解理面反射镜的方法,将光栅色散引入法布里-珀罗腔内,同时保持了解理面反射镜对精细度的控制。得到法布里-珀罗滤波器的自由光谱范围不仅决定于腔长,还决定于色散,通过调整光栅参数获得在大范围内可控的自由光谱范围。数值模拟和分析结果表明,这种啁啾布喇格光栅法布里-珀罗滤波器可以在传统双镜法布里-珀罗滤波器尺寸下获得千倍量级压缩的自由光谱范围,而精细度的调整不影响自由光谱范围。

To obtain a narrow free-spectral range and controllable finesse, twin parallel channel waveguides are completely back coupled by a chirped Bragg grating, and cleaved facet mirrors are fabricated at the entrance of the coupling region. Thereby, the grating dispersion is introduced into the Fabry-Perot cavity, and the control of the cleaved facet mirrors on the finesse is maintained. The free-spectral range is determined not only by the cavity length, but also by the dispersion profile. A wide adjustment range of free-spectral range can be obtained by the adjustment of the grating profile. Numerical simulation and analyses show that the compression ratio of free-spectral range of the order of magnitude of 1000 can be obtained by this chirped Bragg grating F-P filter under the comparable device dimensions with conventional two-mirror F-P, and the free-spectral range will not be affected by the adjustment of finesse.