Low cross talk crescent-shaped pore-assisted few-mode multi-core optical fiber for optical communication

Guorui Wang; Jiwei Zhang; Han Zhang; Fang Wang; Xin Yan; Xuenan Zhang; Shuguang Li; Tonglei Cheng; Tonglei Cheng

doi:10.1364/JOSAB.456989

Journal of the Optical Society of America B
Vol. 39,
Issue 7,
pp. 1839-1846
(2022)
•https://doi.org/10.1364/JOSAB.456989

Low cross talk crescent-shaped pore-assisted few-mode multi-core optical fiber for optical communication

Guorui Wang, Jiwei Zhang, Han Zhang, Fang Wang, Xin Yan, Xuenan Zhang, Shuguang Li, and Tonglei Cheng

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Guorui Wang, Jiwei Zhang, Han Zhang, Fang Wang, Xin Yan, Xuenan Zhang, Shuguang Li, and Tonglei Cheng, "Low cross talk crescent-shaped pore-assisted few-mode multi-core optical fiber for optical communication," J. Opt. Soc. Am. B 39, 1839-1846 (2022)

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Abstract

In this paper, we propose a crescent-shaped pore-assisted structure to realize a few-mode multi-core (four-mode six-core) optical fiber with low inter-core cross talk for large-capacity long-distance communication. Using the finite element method, a theoretical analysis is conducted at a working wavelength of 1550 nm, where the proposed optical fiber achieves a total loss of less than 0.2 dB/km and an effective mode field area of greater than ${{108}}\;\unicode{x00B5} {{\rm{m}}^2}$. The inter-core cross talk of the fiber is less than ${-}{{56}}\;{\rm{dB/100}}\;{\rm{km}}$, and the relative multiplexing factor reaches up to 28.3, which significantly increases the core density. The maximum dispersion of the four supported linear polarization modes is less than ${{5.85}\;{\rm ps}}/({\rm{nm \times km}})$, which is greatly advantageous in communication systems. In addition, the fabrication scheme of the proposed optical fiber is practical, and its standard-compatible 42 µm core pitch promises the feasibility of integration with commercial optical networks.

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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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Parameter	Value
Core rod radius $a$	12 µm
Fiber core radius $b$	7.2 µm
Thickness of silica layer of core rod $t$	3 µm
Air-hole radius $c$	15 µm
Core pitch $d$	42 µm
Outer-cladding thickness OCT	33 µm
Fiber diameter $D$	150 µm
Relative index difference of core and cladding $Δ$	0.68%
Working wavelength $w l$	1.55 µm
Default bending radius $R_{b}$	140 mm

Parameters	Value
Core rod radius $a$	11.8 µm
Fiber core radius $b$	7 µm
Thickness of silica layer of core rod $t$	4.8 µm
Air-hole radius $c$	14.8 µm
Core to core distance $d$	42 µm
Outer-cladding thickness OCT	33 µm
Fiber diameter $D$	150 µm
Relative index difference of core–cladding $Δ$	0.7%
Mode effective refractive index	${L P}_{01} : 1.4524$ ${L P}_{11} : 1.4499$
Mode effective refractive index	${L P}_{21} : 1.4467$ ${L P}_{02} : 1.4457$
Effective mode field area $A_{e f f}$	${L P}_{01} : 110.03 µ m^{2}$ ${L P}_{11} : 156.59 µ m^{2}$
Effective mode field area $A_{e f f}$	${L P}_{21} : 167.11 µ m^{2}$ ${L P}_{02} : 108.61 µ m^{2}$
Maximum ICXT	−56 dB/100 km
Maximum total loss ( ${L P}_{02}$ mode)	0.199 dB/km
Dispersion	${L P}_{01} : 2.73 p s / (n m * k m)$ ${L P}_{11}$ : 5.33 ps/(nm $*$ km)
Dispersion	${L P}_{21} : 5 . 85 p s / (n m * k m)$ ${L P}_{02}$ : 2.11 ps/(nm $*$ km)
RCMF	28.3

SDM Fiber	Channels	ICXT
Seven-core fiber [11]	$7 \times 1$	−42.5 dB/80 km
Hole-assisted FM-MCF [27]	$7 \times 2$	−40 dB/km
Large $A_{e f f}$ FM-MCF [8]	$7 \times 2$	−53 dB/km
Trench-assisted FM-MCF [4]	$7 \times 2$	−50 dB/100 km
DHAS FM-MCF [14]	$7 \times 4$	−32 dB/100 km
Proposed CSPA FM-MCF	$6 \times 4$	−56 dB/100 km

Parameter	Value
Core rod radius $a$	12 µm
Fiber core radius $b$	7.2 µm
Thickness of silica layer of core rod $t$	3 µm
Air-hole radius $c$	15 µm
Core pitch $d$	42 µm
Outer-cladding thickness OCT	33 µm
Fiber diameter $D$	150 µm
Relative index difference of core and cladding $Δ$	0.68%
Working wavelength $w l$	1.55 µm
Default bending radius $R_{b}$	140 mm

Parameters	Value
Core rod radius $a$	11.8 µm
Fiber core radius $b$	7 µm
Thickness of silica layer of core rod $t$	4.8 µm
Air-hole radius $c$	14.8 µm
Core to core distance $d$	42 µm
Outer-cladding thickness OCT	33 µm
Fiber diameter $D$	150 µm
Relative index difference of core–cladding $Δ$	0.7%
Mode effective refractive index	${L P}_{01} : 1.4524$ ${L P}_{11} : 1.4499$
Mode effective refractive index	${L P}_{21} : 1.4467$ ${L P}_{02} : 1.4457$
Effective mode field area $A_{e f f}$	${L P}_{01} : 110.03 µ m^{2}$ ${L P}_{11} : 156.59 µ m^{2}$
Effective mode field area $A_{e f f}$	${L P}_{21} : 167.11 µ m^{2}$ ${L P}_{02} : 108.61 µ m^{2}$
Maximum ICXT	−56 dB/100 km
Maximum total loss ( ${L P}_{02}$ mode)	0.199 dB/km
Dispersion	${L P}_{01} : 2.73 p s / (n m * k m)$ ${L P}_{11}$ : 5.33 ps/(nm $*$ km)
Dispersion	${L P}_{21} : 5 . 85 p s / (n m * k m)$ ${L P}_{02}$ : 2.11 ps/(nm $*$ km)
RCMF	28.3

Abstract

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Figures (12)

Tables (3)

Equations (8)

Journal of the Optical Society of America B