• Chinese Optics Letters
  • Vol. 17, Issue 5, 050601 (2019)
Xi Guo1, Zhikun Xing1, Huabao Qin1, Qizhen Sun1, Deming Liu1, Lin Zhang2, and Zhijun Yan1、*
Author Affiliations
  • 1School of Optical and Electronic Information, National Engineering Laboratory for Next Generation Internet Access System, Huazhong University of Science and Technology, Wuhan 430074, China
  • 2Aston Institute of Photonic Technologies, Aston University, Birmingham B4 7ET, UK
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    DOI: 10.3788/COL201917.050601 Cite this Article Set citation alerts
    Xi Guo, Zhikun Xing, Huabao Qin, Qizhen Sun, Deming Liu, Lin Zhang, Zhijun Yan. Study on polarization spectrum and annealing properties of 45°-tilted fiber gratings[J]. Chinese Optics Letters, 2019, 17(5): 050601 Copy Citation Text show less

    Abstract

    We have investigated the whole polarization-extinction-ratio (PER) spectrum and annealing properties of 45°-tilted fiber gratings (45°-TFGs). Experimental results show the PER spectrum of 45°-TFGs is a Gaussian-like profile and covers a 540 nm bandwidth from 1260 to 1800 nm, in which the bandwidth with PER greater than 10 dB is over 250 nm. The output polarization distribution of 45°-TFGs was analyzed by employing a bulk linear polarizer, and the results show a perfect figure “8”, which indicates that the 45°-TFG is a type of linear polarizer. Moreover, the annealing property of 45°-TFGs was measured up to 700°C, in which the PER of the grating started to decrease at 300°C and reached the minimum at 700°C. Based on these results, the 45°-TFGs can be used as an ultra-wide bandwidth in-fiber polarizing device.
    θB=arctan(n2n1)=arctan(ncore+Δnncore),(1)

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    PER=10×log(TmaxTmin),(2)

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    PER=4.3429×[αs(0°)αp(90°)]×l,(3)

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    Xi Guo, Zhikun Xing, Huabao Qin, Qizhen Sun, Deming Liu, Lin Zhang, Zhijun Yan. Study on polarization spectrum and annealing properties of 45°-tilted fiber gratings[J]. Chinese Optics Letters, 2019, 17(5): 050601
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