摘要
We report periodical rocking long period gratings(PR-LPGs) in PANDA fibers fabricated with CO_2 laser. The PR-LPGs achieve very high coupling efficiency of 19 dB with 12 periods and a 3.5° twist angle in just one scanning cycle, which is much more effective than the conventional CO_2 laser fabrication technique. This type of LPGs exhibits polarization-selective resonance dips which demonstrate different sensitivities to environmental parameters. The high temperature and external refractive index sensitivities are measured simultaneously, so it can be used as a wavelength-selective polarization filter and sensor.
基金
supported by the National Natural Science Foundation of China(No.61605168)
the Natural Science Foundation of Hebei Province(No.F2016203392)
the College and University Natural Science Foundation of Hebei Province(No.QN2016078)
the Science and Technology Project of Qinhuangdao City(No.201601B050)
the Intramural Doctoral Foundation of Yanshan Universtiy(No.B1011)
