Design of a Polymer-Based Hollow-Core Bandgap Fiber for Low-Loss Terahertz Transmission

作者：Barh Ajanta^*; Varshney Ravi K; Pal Bishnu P; Agrawal G P; Rahman B M A

来源：IEEE Photonics Technology Letters, 2016, 28(15): 1703-1706.

DOI：10.1109/LPT.2016.2544198

• Microstructured fiber
• photonic band-gap
• polymer fiber
• terahertz wave

We use numerical simulations to design a hollow-core microstructured polymer optical fiber (HC-mPOF) suitable for broadband, terahertz (THz) pulse transmission with relatively low losses and small dispersion. The HC-mPOF consists of a central large air-core surrounded by periodically arranged wavelength-scale circular air holes in a hexagonal pattern, embedded in a uniform Teflon matrix. The THz guidance in this fiber is achieved by exploiting the photonic bandgap (PBG) effect. In our low index contrast Teflon-air (1.44:1) hexagonal periodic lattice, the PBG appears only for a certain range of non-zero values of the longitudinal wavevector. We have achieved PBG over a broad spectral range (bandwidth similar to 400 GHz) ranging from 1.65 to 2.05 THz in the proposed HC-mPOF. The achievable loss coefficient in our designed HC-mPOF is <4 m(-1) and the group velocity dispersion parameter is <+/- 5 ps/THz.cm over a 300-GHz bandwidth (1.65 similar to 1.95 THz).

• 出版日期2016-8-1