Abstract
A \(\hbox {LP}_{11}\) mode filtering method based on two-mode fiber Bragg grating is proposed in this paper and its feasibility is verified experimentally. The experimental results illustrate that \(\hbox {LP}_{11}\) mode can be obtained in the transmission light of the two-mode FBG when the laser operates at 1,064.7 nm; moreover, by using a three ports circulator, the \(\hbox {LP}_{11}\) mode can also be obtained in the reflection light of the two-mode FBG at 1,062.8 nm. Furthermore, by adjusting core-offset splicing distance between the laser’s pigtail and the two-mode fiber, the insertion loss of the \(\hbox {LP}_{11}\) mode is optimized. And in the case of splicing at the optimal core-offset distance, at 1,064.7 nm, the insertion loss of the \(\hbox {LP}_{11}\) mode obtained at the transmission end is 5.98 dB, and at 1,062.8 nm, the insertion loss of the \(\hbox {LP}_{11}\) mode obtained at the reflection end is 9.30 dB. Due to all-fiber structure, this method of filtering \(\hbox {LP}_{11}\) mode by utilizing the two-mode FBG is easy to implement, and the two-mode FBG is easy to couple with the fiber link.
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Acknowledgments
This work is supported in part by the National Natural Science Foundation of China (No. 61177066), the Science and Technology Development Plan of Jilin Province (No. 20120761) and the Science and Technology Development Plan of Jilin Province (20140203009G X). The research is also sponsored by the Scientific Research Foundation for the Returned Overseas Chinese Scholars, State Education Ministry.
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Hu, G., Han, Y., Xiao, J. et al. Experimental demonstration of \(\hbox {LP}_{11}\) mode filtering based on two-mode fiber Bragg grating. Opt Quant Electron 47, 1973–1982 (2015). https://doi.org/10.1007/s11082-014-0068-z
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DOI: https://doi.org/10.1007/s11082-014-0068-z