Saturable absorber based on the broadband composite-liquid-filled dual-core photonic crystal fiber coupler

Jing Li; Chuncan Wang; Peng Wang

doi:10.1364/JOSAB.417375

Journal of the Optical Society of America B
Vol. 38,
Issue 5,
pp. 1729-1741
(2021)
•https://doi.org/10.1364/JOSAB.417375

Saturable absorber based on the broadband composite-liquid-filled dual-core photonic crystal fiber coupler

Jing Li, Chuncan Wang, and Peng Wang

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Jing Li, Chuncan Wang, and Peng Wang, "Saturable absorber based on the broadband composite-liquid-filled dual-core photonic crystal fiber coupler," J. Opt. Soc. Am. B 38, 1729-1741 (2021)

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Table of Contents Category
- Fiber Optics
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About this Article
History
- Original Manuscript: December 11, 2020
- Revised Manuscript: February 28, 2021
- Manuscript Accepted: April 8, 2021
- Published: April 30, 2021

Abstract

A dual-core photonic crystal fiber coupler based on the heavily ${\rm GeO}_2$-doped-silica-air cladding and composite-liquid (${\rm CS}_2$ and ${\rm C}_2{\rm Cl}_4$) core is proposed to obtain the saturable absorber (SA). It is demonstrated by numerical simulations that the SA with appropriate parameters can exhibit the normal dispersion, high nonlinearity, and flat profile of the linear coupling lengths in the wavelength range from 1500 to 2000 nm. The input pulses with durations ${\gt} 2 \;{\rm ps}$ exhibit relatively high transmissions and low saturable powers mainly because of the strong effect of stimulated Raman scattering in the SA. Consequently, the SA with the ${\rm GeO}_2$ concentration ratio of 80 mol% can be employed in both the erbium- and thulium-doped fiber mode-locked lasers with all-normal or large net-normal dispersion. The dissipative soliton pulses with tunable wavelengths can be obtained in both cases.

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Data Availability

Data underlying the results presented in this paper are not publicly available at this time but may be obtained from the authors upon reasonable request.

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$X$ (mol%)	$Λ$ (µm)	$Δ$	$q$	$d / Λ$	$d_{c} / Λ$
90	5	0.0043	81%	0.5	1.1
	6	0.0024	83%	0.5	1.2
	7	0.0024	83%	0.65	1.0
	8	0.0024	83%	0.65	0.7
80	5	0.0041	67%	0.5	1.1
	6	0.0021	69%	0.55	1.1
	7	0.0021	69%	0.65	1.0
	8	0.0021	69%	0.65	0.7

Element	Parameters	Value
EDF [53]	Length $L_{E r}$ [m]	2.8
	$β_{2}$ [ ${p s}^{2} / m$ ]	$7.69 \times 10^{- 2}$
	$β_{3}$ [ ${p s}^{3} / m$ ]	$1.68 \times 10^{- 4}$
	$γ$ [ $W^{- 1} m^{- 1}$ ]	$9.32 \times 10^{- 3}$
	$Δ λ_{g}$ [nm]	40
	$g_{0}$ [ $m^{- 1}$ ]	7
	$E_{s a t}$ [nJ]	0.4 and 1.8, respectively
Passive fiber (OFS980) [52]	Length $L_{P}$ [m]	4
	$β_{2}$ [ ${p s}^{2} / m$ ]	$4.5 \times 10^{- 3}$
	$β_{3}$ [ ${p s}^{3} / m$ ]	$1.09 \times 10^{- 4}$
	$γ$ [ $w^{- 1} m^{- 1}$ ]	$2.1 \times 10^{- 3}$

Element	Parameters	Value
TDF [16,54]	Length $L_{T m}$ [m]	1.5
	$β_{2}$ [ ${p s}^{2} / m$ ]	$- 7.3 \times 10^{- 2}$
	$β_{3}$ [ ${p s}^{3} / m$ ]	$9.6 \times 10^{- 5}$
	$γ$ [ $W^{- 1} m^{- 1}$ ]	$1.26 \times 10^{- 3}$
	$Δ λ_{g}$ [nm]	90
	$g_{0}$ [ $m^{- 1}$ ]	8
	$E_{s a t}$ [nJ]	0.8
NDF (UHNA4) [16,54]	Length $L_{N D F}$ [m]	6.5 ( $3.5 + 3.0$ )
	$β_{2}$ [ ${p s}^{2} / m$ ]	$9.3 \times 10^{- 2}$
	$β_{3}$ [ ${p s}^{3} / m$ ]	$1.54 \times 10^{- 4}$
	$γ$ [ $w^{- 1} m^{- 1}$ ]	$4.3 \times 10^{- 3}$
SMF28e [16,54]	Length $L_{S M F}$ [m]	0.5
	$β_{2}$ [ ${p s}^{2} / m$ ]	$- 7.1 \times 10^{- 2}$
	$β_{3}$ [ ${p s}^{3} / m$ ]	$1.04 \times 10^{- 4}$
	$γ$ [ $w^{- 1} m^{- 1}$ ]	$1.0 \times 10^{- 3}$

$X$ (mol%)	$Λ$ (µm)	$Δ$	$q$	$d / Λ$	$d_{c} / Λ$
90	5	0.0043	81%	0.5	1.1
	6	0.0024	83%	0.5	1.2
	7	0.0024	83%	0.65	1.0
	8	0.0024	83%	0.65	0.7
80	5	0.0041	67%	0.5	1.1
	6	0.0021	69%	0.55	1.1
	7	0.0021	69%	0.65	1.0
	8	0.0021	69%	0.65	0.7

Element	Parameters	Value
EDF [53]	Length $L_{E r}$ [m]	2.8
	$β_{2}$ [ ${p s}^{2} / m$ ]	$7.69 \times 10^{- 2}$
	$β_{3}$ [ ${p s}^{3} / m$ ]	$1.68 \times 10^{- 4}$
	$γ$ [ $W^{- 1} m^{- 1}$ ]	$9.32 \times 10^{- 3}$
	$Δ λ_{g}$ [nm]	40
	$g_{0}$ [ $m^{- 1}$ ]	7
	$E_{s a t}$ [nJ]	0.4 and 1.8, respectively
Passive fiber (OFS980) [52]	Length $L_{P}$ [m]	4
	$β_{2}$ [ ${p s}^{2} / m$ ]	$4.5 \times 10^{- 3}$
	$β_{3}$ [ ${p s}^{3} / m$ ]	$1.09 \times 10^{- 4}$
	$γ$ [ $w^{- 1} m^{- 1}$ ]	$2.1 \times 10^{- 3}$

Abstract

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Tables (3)

Equations (17)

Journal of the Optical Society of America B