Hill-shaped refractive index 16-core fiber with 160 channels of low crosstalk and high RCMF

Chun Wang; Shuguang Li; Zenghui Li; Pengshuai Shao; Yinpeng Liu

doi:10.1364/JOSAB.503460

Journal of the Optical Society of America B
Vol. 40,
Issue 12,
pp. 3104-3112
(2023)
•https://doi.org/10.1364/JOSAB.503460

Hill-shaped refractive index 16-core fiber with 160 channels of low crosstalk and high RCMF

Chun Wang, Shuguang Li, Zenghui Li, Pengshuai Shao, and Yinpeng Liu

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Chun Wang, Shuguang Li, Zenghui Li, Pengshuai Shao, and Yinpeng Liu, "Hill-shaped refractive index 16-core fiber with 160 channels of low crosstalk and high RCMF," J. Opt. Soc. Am. B 40, 3104-3112 (2023)

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- Fiber Optics
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About this Article
History
- Original Manuscript: August 15, 2023
- Revised Manuscript: October 19, 2023
- Manuscript Accepted: October 20, 2023
- Published: November 13, 2023

Abstract

We present a hill-shaped refractive index (HS-RI) structure in 16-core fiber that can provide 160 channels for the transmission system. The HS-RI mainly settles the issue of the large inter-mode crosstalk (IMXT) between ${{\rm LP}_{21}}$ mode and ${{\rm LP}_{02}}$ mode. We obtain the optimized parameters using the finite element method. Numerical analyses reveal that the inter-core crosstalk (ICXT) of all modes is smaller than ${-}{30}\;{\rm dB/100}\;{\rm km}$ in the C band, and the effective mode refractive index difference ($\Delta {n_{\rm{eff}}}$) is more than ${1} \times {{10}^{- 3}}$. The minimum effective mode field area can achieve ${89.80}\;{{\unicode{x00B5}{\rm m}}^2}$, which greatly reduces the nonlinearity of fiber. The max dispersion is ${15.59}\;{\rm ps/}({\rm nm*km})$, which can greatly guarantee signal quality in the transmission process. he relative core multiplexing factor (RCMF) can reach 65.81, which realizes the high space division multiplexing rate. The proposed fiber can be applied to a space division multiplexing system to enhance the fiber transmission channels and capacity.

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Symbol of Parameter	Value
$R$	125 µm
$r_{c o}$	7 µm
$r_{i n}$	2 µm
$e$	7 µm
$d$	44 µm
$Δ n_{1}$	0.15%
$Δ n_{3}$	1.1%
$Δ n_{4}$	0.9%
$α$	4

	${L P}_{01}$	${L P}_{11}$	${L P}_{21}$	${L P}_{02}$	${L P}_{31}$	${L P}_{12}$
${L P}_{01}$	−142.68	−144.34	−108.47	−90.07	−77.87	−58.84
${L P}_{11}$	−146.99	−133.38	−109.99	−89.64	−78.23	−53.20
${L P}_{21}$	−90.54	−93.05	−92.58	−84.93	−76.94	−54.43
${L P}_{02}$	−90.80	−95.17	−93.28	−86.94	−77.35	−63.25
${L P}_{31}$	−66.92	−69.04	−68.71	−68.90	−66.18	−54.58
${L P}_{12}$	−54.75	−43.29	−45.56	−42.66	−46.26	−40.26

Performance	${L P}_{01}$	${L P}_{11}$	${L P}_{21}$	${L P}_{02}$	${L P}_{31}$	${L P}_{12}$
$Δ n_{e f f}$	$0. 0031 ({L P}_{01 - 11})$ , $0.00380 ({L P}_{11 - 21})$ , $0.0011 ({L P}_{21 - 02})$ , $0.00346 ({L P}_{02 - 31})$ , $0.00186 ({L P}_{31 - 12})$
ICXT (dB/100 km)	−142.68	−133.38	−92.58	−86.94	−66.18	−40.26
$A_{e f f} ({µ m}^{2})$	89.80	132.92	145.39	88.34	152.41	138.29
Dispersion coefficient ( $p s / (n m \cdot k m)$ )	3.62	8.369	12.98	12.21	15.59	6.53
DMGD (ps/m)	$5.53 ({L P}_{11 - 01})$ , $12.42 ({L P}_{21 - 01})$ , $5.53 ({L P}_{02 - 01})$ , $19.84 ({L P}_{31 - 01})$ , $20.92 ({L P}_{12 - 01})$
BL of ${L P}_{12}$ at 1565 nm ( $R_{b} = 30 m m$ )	$9.51 \times 10^{- 4} (d B / 100 t u r n s)$
RCMF	65.81

Symbol of Parameter	Value
$R$	125 µm
$r_{c o}$	7 µm
$r_{i n}$	2 µm
$e$	7 µm
$d$	44 µm
$Δ n_{1}$	0.15%
$Δ n_{3}$	1.1%
$Δ n_{4}$	0.9%
$α$	4

	${L P}_{01}$	${L P}_{11}$	${L P}_{21}$	${L P}_{02}$	${L P}_{31}$	${L P}_{12}$
${L P}_{01}$	−142.68	−144.34	−108.47	−90.07	−77.87	−58.84
${L P}_{11}$	−146.99	−133.38	−109.99	−89.64	−78.23	−53.20
${L P}_{21}$	−90.54	−93.05	−92.58	−84.93	−76.94	−54.43
${L P}_{02}$	−90.80	−95.17	−93.28	−86.94	−77.35	−63.25
${L P}_{31}$	−66.92	−69.04	−68.71	−68.90	−66.18	−54.58
${L P}_{12}$	−54.75	−43.29	−45.56	−42.66	−46.26	−40.26

Abstract

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Figures (13)

Tables (3)

Equations (10)

Journal of the Optical Society of America B