Magnetically-induced circular-polarization-dependent loss of magneto-optic fiber Bragg gratings with linear birefringence

作者：Wu, Baojian^*; Wen, Feng; Qiu, Kun; Han, Rui; Lu, Xin

来源：Optical Fiber Technology, 2013, 19(3): 219-222.

DOI：10.1016/j.yofte.2013.01.005

• Magneto-optic fiber Bragg grating
• Magnetic field measurement
• Magnetically-induced circular-polarization dependent loss (MCDL)
• Elliptical birefringence

The concept of magnetically-induced circular-polarization-dependent loss (MCDL) for magneto-optic fiber Bragg gratings (MFBGs) is introduced. The magnetic field dependency of MCDL for linearly birefringent MFBGs is simulated by use of the equivalent theoretical model given in the paper. This model is mainly composed of an elliptical polarization extractor and a couple of isotropic fiber Bragg gratings (FBGs) with different effective refractive indices. It is shown by simulation that, (1) when the magneto-optic-to-grating coupling coefficient ratio is less than 0.1, the peak MCDL is proportional to applied magnetic induction; (2) the MCDL method is more suitable for the magnetic field measurement than the conventional polarization dependent loss (PDL) for the linearly birefringent MFBGs. As an example, the MCDL of an erbium-doped MFBG (Er-MFBG) is measured and the experimental data are in agreement with the theoretical results. The effective Verdet constant for the Er-MFBG is about -11 rad/(T.m) and the peak MCDL is up to 1 dB at 1.15 T.

• 出版日期2013-6
• 单位电子科技大学