A method to increase fiber extinction ratio based on the influence of mirrors on beam polarization

Yuchen Jia; Binquan Zhou; Kaifeng Yin

doi:10.1117/12.2503961

12 December 2018 A method to increase fiber extinction ratio based on the influence of mirrors on beam polarization

Yuchen Jia, Binquan Zhou, Kaifeng Yin

Proceedings Volume 10849, Fiber Optic Sensing and Optical Communication; 108490G (2018) https://doi.org/10.1117/12.2503961
Event: International Symposium on Optoelectronic Technology and Application 2018, 2018, Beijing, China

Abstract

Atomic sensing devices usually contain fiber coupling systems. A two-mirror fiber coupling system is usually used in our research to couple spatial light into polarization maintaining fiber. In order to improve the axes alignment accuracy and optical extinction ratio of this fiber coupling system for atomic sensing devices, we propose an improved method based on the influence of mirrors on beam polarization. The polarization maintaining fiber can maintain the polarization of linear polarized light only when the polarization direction coincides with the fiber. However, according to theoretical analysis by Jones Matrix and experimental results, we demonstrate that mirrors have non-negligible influence on beam polarization, which causes difficulty in axes alignment. Both dielectrical mirrors and metallic mirrors have influence on the azimuth and ellipticity of polarized light, and the influence of dielectrical mirrors is more remarkable than that of metallic mirrors. Thus we propose to add a half wave plate or a quarter wave plate in the system to compensate for the influence of mirrors, and the extinction ratio of fiber output light is consequently increased. According to the experimental results, our new approach can increase the extinction ratio by about 30dB.

Citation Download Citation

Yuchen Jia, Binquan Zhou, and Kaifeng Yin "A method to increase fiber extinction ratio based on the influence of mirrors on beam polarization", Proc. SPIE 10849, Fiber Optic Sensing and Optical Communication, 108490G (12 December 2018); https://doi.org/10.1117/12.2503961

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KEYWORDS

Mirrors

Fiber couplers

Optical testing

Polarization

Refractive index

Sensing systems

Wave plates

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