Ms. Wenting Guo Profile

Wenting Guo

at Beijing University of Posts and Communications

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Proceedings Article | 31 October 2016 Paper

Experimental measurement of effective refractive index difference for few mode polarization maintaining fibers using S2 method

Wenting Guo, Yan Li, Xinglin Zeng, Qi Mo, Wei Li, Zhijian Liu, Jian Wu

Proceedings Volume 10019, 100190P (2016) https://doi.org/10.1117/12.2245968

KEYWORDS: Polarization maintaining fibers, Polarization, Multiplexing, Optical fibers, Infrared cameras, Tunable lasers, Refractive index, Fourier transforms, Scattering, Lithium

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Polarization maintaining fibers (PMFs) can keep linear polarization state against external perturbations by inducing a high effective refractive index difference (Δneff) along one polarization axis. For few mode polarization maintaining fibers (FM-PMFs), Δneff is applicable between both orthogonal linear polarization modes (e.g. LP_01x and LP_01y) and orthogonal degenerated modes (e.g. LP_11a and LP_11b), which can enable advanced functionalities in multiple-input multiple- output-free spatial division multiplexing systems and optical fiber sensing systems. Therefore, the measurement of Δneff for polarization modes and degenerated modes is very important for determining the quality of a FM-PMF. However, measurement of the Δneff for FM-PMFs can be complicated due to the requirement for generating and demultiplexing of the higher order modes (HOMs). In this paper, we propose to measure the Δneff of FM-PMFs using Spatially and Spectrally resolved imaging (S²) method for the first time. The presented method is simply by employing a tunable laser and an IR CCD camera, can avoid any mode converter or mode multiplexer/demultiplexer, featuring a rapid testing speed. A proof-of-concept experiment is carried out to measure FM-PMFs with a length of 1.1m and 5m. The Δneff between the orthogonal polarization modes (i.e. LP_11ax-11ay, LP_11bx-11by, LP_21ax-21ay, and LP21bx-21by) are characterized as 7.05×10^-4, 6.91×10^-4, 1.02×10^-3 and 1.04×10^-3 respectively. The Δneff of the orthogonal degenerated modes (i.e. LP_11ax-11bx, LP_11ay-11by, LP_21ax-21bx and LP_21ay-21by) are also characterized to be 1.39×10^-4, 1.24×10^-4, 5.61×10^-5 and 6.53×10^-5 respectively.

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