Terahertz polarization splitter based on orthogonal microstructure dual-core photonic crystal fiber

Abstract

A broadband polarization splitter operating in the terahertz (THz) band is proposed based on dual-core photonic crystal fiber with orthogonal microstructure in the core regions. The Index Converse Matching Coupling method is presented to design the THz polarization splitter for the first time, which exhibits several advantages, such as short splitting length, high extinction ratio, low loss, and broad operation bandwidth. By numerical simulation, it has been found that the strong coupling occurs within a frequency range of 0.4-0.7 THz. The operation bandwidth is more than 0.15 THz (equal to 138 μm). The shortest splitting length is only 1.83 cm at 0.4 THz. The extinction ratios for both of x and ypolarization are better than -15 dB when the frequency is larger than 0.51 THz. The lowest material absorption loss is only 0.34 dB at 0.4 THz. Moreover, this structure is simple to design and easy to fabricate over its counterparts in the communication band. Our research offers an effective method to design a broadband THz device and would be of significance for future relevant applications.

Dielectric tube waveguides with absorptive cladding for broadband, low-dispersion and low loss THz guiding

“…Numerous metal- and dielectric-based waveguides234567891011121314151617181920212223242526272829303132333435363738394041424344 and devices, such as fiber Bragg gratings (FBGs)454647 and couplers4849505152535455, have been studied. However, restistive losses of metals and in particular high absorption of most dielectric materials make design of low loss THz waveguides and devices challenging.…”

Design of Low-loss and Highly Birefringent Porous-Core Photonic Crystal Fiber and Its Application to Terahertz Polarization Beam Splitter

“…On the other hand, the ER by y-polarization presents two peaks; it is due to the fact that the output power is zero at 0.9828 THZ and 1.0684 THz, and consequently ER−→∞ in the PBS with asymmetric cores. The two PBS configurations proposed in this work present a better performance than others reported in the past [28], [30]- [32]. For example, the proposed PBS presents a bandwidth 15.3 times higher than the one proposed by Chen et al [30] and 1.7 times higher than the proposed by Chen et al [28].…”

“…An all fiber-based polarization splitter is one of the most important devices in a THz system and, to design it effectively, the operational bandwidth and transmission loss properties are key considerations. Consequently, many configurations of PBS have been proposed using structures with rectangular cores with slots [28], dual-elliptical cores [30], and dual-core photonic crystal fiber with orthogonal microstructure [32]. All these configurations show the importance of the orientation of one core respect to the other.…”

Porous core photonic crystal fibre with metal‐coated central hole for terahertz applications

“…PCFs have many related applications such as fibre lasers, non-linear devices, sensors and telecommunication [10,11]. In addition, PCFs can also be used in THz applications such as THz switches, polarisation controllers and THz polarisation splitters [12,13].…”