Study on polarization spectrum and annealing properties of 45°-tilted fiber gratings

Xi Guo, Zhikun Xing, Huabao Qin, Qizhen Sun, Deming Liu, Lin Zhang, Zhijun Yan*

*Corresponding author for this work

Research output: Contribution to journalArticle


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.

Original languageEnglish
Article number050601
JournalChinese Optics Letters
Issue number5
Publication statusPublished - 20 May 2019


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