Ultra-Short Dual-Core Photonic Crystal Fiber Polarization Beam Splitter with Round Lattice and As2S3-Filled Center Air Hole

A circular ultra-short As2S3 filled double-core photonic crystal fiber polarization beam splitter is proposed. The finite element method is used to study the performance of the designed photonic crystal fiber polarization beam splitter. By filling high refractive index As2S3 into the central air hole, the coupling performance of the double-core PCF is improved. By optimizing geometric parameters, the splitting length of the circular beam splitter can be as short as 72.43 μm, and the extinction ratio can reach −151.42 dB. The high extinction ratio makes the circular polarization beam splitter have a good beam splitting function. The designed circular double-core photonic crystal fiber has the same cladding pore diameter, which is easier to prepare than other photonic crystal fibers with complex pore structure. Due to the advantages of high extinction ratio, extremely short beam splitting function and simple structure, the designed polarization beam splitter will be widely used in all-optical networks and optical device preparation.

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Mid-infrared broadband polarization beam splitter based on GaS photonic crystal fiber with high extinction ratio

Optik ◽

10.1016/j.ijleo.2021.166971 ◽

2021 ◽

pp. 166971

Author(s):

Guang-ming Zheng

Keyword(s):

Photonic Crystal ◽

Photonic Crystal Fiber ◽

Beam Splitter ◽

Extinction Ratio ◽

Polarization Beam Splitter ◽

Mid Infrared ◽

Crystal Fiber ◽

High Extinction Ratio

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Numerical Investigation of a Short Polarization Beam Splitter Based on Dual-Core Photonic Crystal Fiber with As2S3 Layer

Micromachines ◽

10.3390/mi11070706 ◽

2020 ◽

Vol 11 (7) ◽

pp. 706

Author(s):

Nan Chen ◽

Xuedian Zhang ◽

Xinglian Lu ◽

Zheng Zhang ◽

Zhangjian Mu ◽

...

Keyword(s):

Photonic Crystal ◽

Photonic Crystal Fiber ◽

Beam Splitter ◽

Extinction Ratio ◽

Polarized Light ◽

Polarization Beam Splitter ◽

Optical Fields ◽

Crystal Fiber ◽

Dual Core ◽

Better Than

A polarization beam splitter is an important component of modern optical system, especially a splitter that combines the structural flexibility of photonic crystal fiber and the optical modulation of functional material. Thus, this paper presents a compact dual-core photonic crystal fiber polarization beam splitter based on thin layer As2S3. The mature finite element method was utilized to simulate the performance of the proposed splitter. Numerical simulation results indicated that at 1.55 μm, when the fiber device length was 1.0 mm, the x- and y-polarized lights could be split out, the extinction ratio could reach −83.6 dB, of which the bandwidth for extinction ratio better than −20 dB was 280 nm. It also had a low insertion loss of 0.18 dB for the x-polarized light. In addition, it can be completely fabricated using existing processes. The proposed compact polarization beam splitter is a promising candidate that can be used in various optical fields.

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A Novel Liquid Crystal-Filled, Dual-Core Photonic Crystal Fiber Polarization Beam Splitter Covering the E + S + C + L + U Communication Band

Photonics ◽

10.3390/photonics8110461 ◽

2021 ◽

Vol 8 (11) ◽

pp. 461

Author(s):

Yuwei Qu ◽

Ying Han ◽

Jinhui Yuan ◽

Xian Zhou ◽

Binbin Yan ◽

...

Keyword(s):

Liquid Crystal ◽

Photonic Crystal ◽

Photonic Crystal Fiber ◽

Communication Systems ◽

Beam Splitter ◽

Extinction Ratio ◽

Polarization Beam Splitter ◽

Propagation Length ◽

Crystal Fiber ◽

Dual Core

This paper proposes a novel liquid crystal-filled, dual core photonic crystal fiber polarization beam splitter (LC-DC-PCF PBS) based on the coupled mode theory of DC-PCF. The mode birefringence of odd and even modes, coupling lengths (CLs) of the X-polarization (X-pol) and Y-polarization (Y-pol), and the corresponding coupling length ratio (CLR) of the proposed LC-DC-PCF PBS filled without LC E7 and with LC E7 are compared. The change rules of the CLs of the X-pol and Y-pol and CLR of the proposed LC-DC-PCF with wavelengths for different cladding microstructure parameters were investigated. The relationships between the X-pol and Y-pol normalized output powers in core A of the proposed LC-DC-PCF PBS and the propagation length at the wavelength of 1.604 μm are discussed. Finally, by studying the change of extinction ratio (ER) with wavelength, the LC-DC-PCF PBS ER of 60.3 and 72.2 dB at wavelengths 1.386 and 1.619 μm are achieved, respectively. The final splitting length (LS) is 94 μm, and the splitting bandwidth is 349 nm (1.352~1.701 μm), covering the whole of the E + S + C + L + U communication bands. The proposed LC-DC-PCF PBS has good beam-splitting performance, such as ultra-short LS and ultra-wide splitting bandwidth, with potential applications in laser, sensing, and communication systems.

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