Long period grating-based fiber coupler to whispering gallery mode resonators
Long period grating-based fiber coupler to whispering gallery mode resonators
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DOI：
10.1364/ol.39.006525
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发表时间：
2014-11-15
期刊：
影响因子：
3.6
通讯作者：
Conti, G. Nunzi
中科院分区：
文献类型：
--
作者：
Farnesi, D.;Chiavaioli, F.;Conti, G. Nunzi
提出了一种基于写入石英光纤的长周期光纤光栅(LPG)的高Q值二氧化硅回音廊模谐振器(WGM)的光耦合新方法。LPG允许选择性地激励光纤中的高阶方位对称包层模。当光纤的部分锥化也被实现时，这些包层模与二氧化硅谐振器中的WGMS的耦合是可能的，以便减小光场大小并增加其外部消逝部分。重要的是，锥度尺寸大约比标准光纤锥度耦合器大一个数量级。因此，建议的方法更加稳健和有用，特别是在实际应用中。我们展示了与高Q值二氧化硅微球和微泡的耦合，当穿过共振时，检测到光纤输出端的透射率下降。这种方法的另一个特征是，通过级联具有不同周期的LPG，还可以沿着同一光纤对不同的谐振器进行波长选择性寻址。(C)2014年美国光学学会
We present a new method for coupling light to high-Q silica whispering gallery mode resonators (WGMs) that is based on long period fiber gratings (LPGs) written in silica fibers. An LPG allows selective excitation of high-order azimuthally symmetric cladding modes in a fiber. Coupling of these cladding modes to WGMs in silica resonators is possible when partial tapering of the fiber is also implemented in order to reduce the optical field size and increase its external evanescent portion. Importantly, the taper size is about one order of magnitude larger than that of a standard fiber taper coupler. The suggested approach is therefore much more robust and useful especially for practical applications. We demonstrate coupling to high-Q silica microspheres and microbubbles detecting the transmission dip at the fiber output when crossing a resonance. An additional feature of this approach is that by cascading LPGs with different periods, a wavelength selective addressing of different resonators along the same fiber is also possible. (C) 2014 Optical Society of America