| Study on polarization spectrum and annealing properties of 45°-tilted fiber gratings |
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| 作者姓名： | 郭曦 邢志坤 覃华宝 孙琪真 刘德明 张琳 闫志君 |
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| 基金项目： | supported by the National Natural Science Foundation of China(No.61505244);the Fundamental Research Funds for the Central Universities(No.HUST:2017KFYXJJ033);the Science Fund for Creative Research Groups of the Natural Science Foundation of Hubei(No.2018CFA004);the Major Projects of Technical Innovation of Hubei(No.2018AAA040) |
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| 摘 要： | 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 Gaussianlike 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℃, in which the PER of the grating started to decrease at 300℃ and reached the minimum at 700℃. Based on these results, the 45°-TFGs can be used as an ultra-wide bandwidth in-fiber polarizing device.
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| 关 键 词： | EXPERIMENTAL PER was is CAN |
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