Performance analysis of a photonic crystal fiber polarization filter
filled with different materials

Junjun Wu; Chao Wang; Lichun Hu; Chao Dou

doi:10.1364/AO.441355

Applied Optics
Vol. 60,
Issue 32,
pp. 10176-10185
(2021)
•https://doi.org/10.1364/AO.441355

Performance analysis of a photonic crystal fiber polarization filter filled with different materials

Junjun Wu, Chao Wang, Lichun Hu, and Chao Dou

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Junjun Wu, Chao Wang, Lichun Hu, and Chao Dou, "Performance analysis of a photonic crystal fiber polarization filter filled with different materials," Appl. Opt. 60, 10176-10185 (2021)

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Related Topics
Table of Contents Category
- Fiber Optics, Fiber Sensors, and Optical Communications
Optics & Photonics Topics
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About this Article
History
- Original Manuscript: September 6, 2021
- Revised Manuscript: October 18, 2021
- Manuscript Accepted: October 20, 2021
- Published: November 4, 2021

Abstract

A compact square photonic crystal fiber polarization filter with high performance is proposed. Two larger holes filled with different metal and fluid are designed to break the strict structure symmetry and forming high birefringence. Four small pores are designed to provide a wider channel for the coupling between defect mode and core mode. Its filtering and coupling characteristics are analyzed by the full vector finite element method. In addition, the properties of PCF filled with different materials are compared and discussed. Different metal materials have different dielectric constants, different optical damping, interband transitions, molecular structure, and physicochemical properties, which make their transmission modes and coupling strength different. The results show that the performance of a PCF filter filled with gold and liquid is the best, which is very suitable for an adjustable PCF polarization filter. The calculation results show that the extinction ratio of the designed filter can reach 5383 dB for a device length of 3 mm; the unwanted fiber loss can reach 2073 dB/cm; and the applicable bandwidth of 2000 nm covers almost the whole communication band. The proposed polarization filter shows large unwanted loss, high extinction ratio, wide bandwidth and coordination, which make it a good candidate for excellent optical fiber filter devices.

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All the data underlying the results can be obtained from the corresponding author upon reasonable request, but raw data required to reproduce these findings cannot be shared at this time, as that data also form part of an ongoing study.

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$ω_{p}$	$m$	$f_{0}$	$Γ_{0}$	$f_{1}$	$Γ_{1}$	$ω_{1}$
9.01	5	0.845	0.048	0.065	3.886	0.816
$f_{2}$	$Γ_{2}$	$ω_{2}$	$f_{3}$	$Γ_{3}$	$ω_{3}$	$f_{4}$
0.124	0.452	4.481	0.011	0.065	8.185	0.840
$Γ_{4}$	$ω_{4}$	$f_{5}$	$Γ_{5}$	$ω_{5}$
0.916	9.083	5.646	2.419	20.29

$ω_{p}$	$m$	$f_{0}$	$Γ_{0}$	$f_{1}$	$Γ_{1}$
14.98	4	0.523	0.047	0.227	0.333
$ω_{1}$	$f_{2}$	$Γ_{2}$	$ω_{2}$	$f_{3}$	$Γ_{3}$
0.162	0.050	0.312	1.544	0.166	1.351
$ω_{3}$	$f_{4}$	$Γ_{4}$	$ω_{4}$
1.808	0.030	3.382	3.473

	Unwanted Loss	Extinction	Bandwidth
Reference	(dB/cm)	Ratio (dB)	(nm)
[5]	686	70 ( $L = 1 m m$ )	750
[7]	544	462 ( $L = 1 m m$ )	504
[8]	238	240 ( $L = 1 m m$ )	70
[9]	592	493 ( $L = 1 m m$ )	521
[10]	399	346 ( $L = 1 m m$ )	40
This work	2073	1794 dB ( $L = 1 m m$ )	2000
		3589 dB ( $L = 2 m m$ )
		5383 dB ( $L = 3 m m$ )

Filling Material	Unwanted Loss (dB/cm)	Extinction Ratio (dB)	Bandwidth (nm)
Gold	1521	3946	1200
Silver	869	2253	300
Aluminum	1287	3331	2000
Gold and graphene	276	718	1000
Gold and alcohol	2073	5383	1300
Gold and magnetic fluid	1926	5001	1200

$ω_{p}$	$m$	$f_{0}$	$Γ_{0}$	$f_{1}$	$Γ_{1}$	$ω_{1}$
9.01	5	0.845	0.048	0.065	3.886	0.816
$f_{2}$	$Γ_{2}$	$ω_{2}$	$f_{3}$	$Γ_{3}$	$ω_{3}$	$f_{4}$
0.124	0.452	4.481	0.011	0.065	8.185	0.840
$Γ_{4}$	$ω_{4}$	$f_{5}$	$Γ_{5}$	$ω_{5}$
0.916	9.083	5.646	2.419	20.29

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Equations (10)

Applied Optics