Abstract-Low-loss terahertz polarization splitter based on an asymmetric dual-suspended-core fiber

Yuan-Feng Zhu,  Xin Liu,  Chun-Fang Rao; Hua Zhong, Hai-Mei Luo,  Yan-Hua Chen, Zhi-Qing Ye,  Hua Wang,

https://www.spiedigitallibrary.org/journals/Optical-Engineering/volume-57/issue-8/086112/Low-loss-terahertz-polarization-splitter-based-on-an-asymmetric-dual/10.1117/1.OE.57.8.086112.short?SSO=1

A relatively simple design of a terahertz (THz) polarization splitter based on an asymmetric dual-suspended-core fiber is proposed. One core is formed by two intersecting rectangular dielectric strips with dissimilar thickness, whereas the other is a round solid core suspended by crossed dielectric strips with the same thickness. The distance between the cores can be adjusted to ensure a short splitting length and low transmission loss. A THz polarization splitter with a length of 1.27 cm is realized with a low transmission loss of 0.53 and 0.67 dB for the x- and y-polarization modes, respectively. An extinction ratio of about −20  dB and a broad bandwidth of 0.046 THz are demonstrated.

© 2018 Society of Photo-Optical Instrumentation Engineers (SPIE)

Abstract-Terahertz polarization splitter based on a dual-elliptical-core polymer fiber

Terahertz polarization splitter based on a dual-elliptical-core polymer fiber

Hongzhi Chen, Guofeng Yan, Erik Forsberg, and Sailing He

https://www.osapublishing.org/ao/abstract.cfm?uri=ao-55-23-6236

A terahertz polarization splitter based on a dual-elliptical-core polymer fiber is proposed and theoretically optimized. Dual-elliptical cores with subwavelength-scale diameters are independently suspended within a fiber, which not only support two orthogonal polarization modes, being single-mode guided with low absorption losses, but also allow them to switch from one core to the other, with different coupling lengths. As a consequence, the two polarizations can be easily separated by choosing a suitable transmission length at a desired operation frequency. The transmission modes, coupling lengths for x- and y-polarizations, as well as the performance of the proposed polarization splitter at a center-frequency of 0.6 THz are investigated and numerically analyzed. A 1.43 cm long splitter with an ultralow loss of 0.4 dB, a high extinction ratio better than −10  dB and a bandwidth of 0.02 THz is achieved.

© 2016 Optical Society of America

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