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Chin. Phys. B, 2014, Vol. 23(8): 088701    DOI: 10.1088/1674-1056/23/8/088701

Realization of a broadband terahertz wavelength-selective coupling based on five-core fibers

Li Xu-You (李绪友), Yu Ying-Ying (于莹莹), Sun Bo (孙波), He Kun-Peng (何昆鹏)
College of Automation, Harbin Engineering University, Harbin 150001, China
Abstract  We propose a novel kind of wavelength-selective coupling for the terahertz range based on solid five-core fiber (FCF). The performances of coupling, propagation characteristics, and confinement loss properties are numerically investigated by using a full vector beam propagation method (BPM). Simulation results show that it is possible to realize a broadband wavelength-selective coupling. The coupling length can reach 1.913 cm, and the confinement loss is better than 1.965× 10-4 cm-1. Furthermore, a parameter, the power difference, is defined, and it numerically demonstrates the working performance of the wavelength-selective coupler; that is, when the power difference is better than -15 dB, the frequency located in the range of 0.76 THz-1.00 THz is separated relatively well from the frequency of 0.3 THz. Finally, the effect of the structural parameter on the working performance of the coupler is also investigated. We show that the performance optimization is possible by appropriately tuning the core diameter, and the tunabilities of frequency and bandwidth are possible by appropriately tuning the pitch. The wavelength-selective coupler is of potential application for optical fiber sensing and communication in terahertz wavelength division multiplexer fields.
Keywords:  terahertz      terahertz waveguides      coupling      multi-core fiber  
Received:  09 November 2013      Revised:  05 March 2014      Accepted manuscript online: 
PACS:  87.50.U-  
  42.81.Qb (Fiber waveguides, couplers, and arrays)  
  42.81.Dp (Propagation, scattering, and losses; solitons)  
Fund: Project supported by the Specific Scientific and Technological Cooperation between China and Russia (Grant No. 2010DFR80140) and the National Natural Science Foundation of China (Grant No. 51309059).
Corresponding Authors:  Yu Ying-Ying     E-mail:

Cite this article: 

Li Xu-You (李绪友), Yu Ying-Ying (于莹莹), Sun Bo (孙波), He Kun-Peng (何昆鹏) Realization of a broadband terahertz wavelength-selective coupling based on five-core fibers 2014 Chin. Phys. B 23 088701

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