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

• 来源期刊: 中国光学快报（英文版）
• 年，卷（期）: 2019,（5）
• 页码范围: 6-10
• 页数: 5页
• 语种: 英文
• DOI: 10.3788/COL201917.050601

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 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℃,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.