All-fiber mode converter based on superimposed long period fiber gratings

Yan-ru Xue; Wei-hong Bi; Wa Jin; Peng-fei Tian; Peng Jiang; Qiang Liu; Yun Jin

doi:10.1007/s11801-018-7141-y

Optoelectronics Letters ›› , Vol. 14 ›› Issue (2) : 81-83. DOI: 10.1007/s11801-018-7141-y

Article

All-fiber mode converter based on superimposed long period fiber gratings

Yan-ru Xue¹^,² ,
Wei-hong Bi¹^,³^,^b ,
Wa Jin¹ ,
Peng-fei Tian¹ ,
Peng Jiang¹ ,
Qiang Liu¹ ,
Yun Jin¹

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Abstract

In this paper, a novel broadband all-fiber mode converter is proposed and experimentally demonstrated. Through writing a pair of superimposed long period fiber gratings (SLPFGs) in tow-mode fiber (TMF) with a CO₂ laser, the mode converter can realize the conversion from LP₀₁ to LP₁₁ owing to the phase matching condition. Numerical and experimental results show that the bandwidth of this mode converter is 3 times broader than that of a single grating converter. The converter has low loss, high coupling efficiency, small size and is easy to fabricate, so it can be widely used in mode-division multiplexing.

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Yan-ru Xue, Wei-hong Bi, Wa Jin, Peng-fei Tian, Peng Jiang, Qiang Liu, Yun Jin. All-fiber mode converter based on superimposed long period fiber gratings. Optoelectronics Letters, , 14(2): 81‒83 https://doi.org/10.1007/s11801-018-7141-y

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This work has been supported by the National Natural Science Foundation of China (Nos.61475133, 61640408 and 61605168), the Natural Science Foundation of Hebei Province (No.F2016203392), the College and University Science and Technology Research Project of Hebei Province (No.QN2016078), the Science and Technology Project of Qinhuangdao City (No.201601B050), and the Intramural Doctoral Foundation of Yanshan University (No.B1011).