Low-cross-talk and multi-channel heterogeneous 13-core four-LP mode fiber with a high refractive index ring and a trench

Pengshuai Shao; Shuguang Li; Jianshe Li; Xiaojian Meng; Ying Guo; Zenghui Li; Luyao Wang

doi:10.1364/JOSAB.456111

Journal of the Optical Society of America B
Vol. 39,
Issue 6,
pp. 1462-1469
(2022)
•https://doi.org/10.1364/JOSAB.456111

Low-cross-talk and multi-channel heterogeneous 13-core four-LP mode fiber with a high refractive index ring and a trench

Pengshuai Shao, Shuguang Li, Jianshe Li, Xiaojian Meng, Ying Guo, Zenghui Li, and Luyao Wang

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Pengshuai Shao, Shuguang Li, Jianshe Li, Xiaojian Meng, Ying Guo, Zenghui Li, and Luyao Wang, "Low-cross-talk and multi-channel heterogeneous 13-core four-LP mode fiber with a high refractive index ring and a trench," J. Opt. Soc. Am. B 39, 1462-1469 (2022)

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Abstract

We propose a heterogeneous 13-core few-mode fiber, which is characterized by the combination of a high refractive index ring and a trench. All cores of the optical fiber can stably transmit ${{\rm LP}_{01}}$, ${{\rm LP}_{11}}$, ${{\rm LP}_{21}}$, and ${{\rm LP}_{02}}$ modes in the C$+$L band through structural optimization and numerical analysis. The effective refractive index difference of the ${{\rm LP}_{21}}$ and ${{\rm LP}_{02}}$ modes reaches ${2} \times {{10}^{- 3}}$, which is conducive to the independent transmission of modes. The trench can effectively suppress the inter-core cross talk below ${-}{50}\;{\rm dB/km}$ at 1550 nm. The proposed few-mode multi-core fiber is conducive to solving the long-distance signal transmission problem of large capacity and low cross talk in future optical communication systems.

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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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Initial Conditions	Meaning	Core 1	Core 2	Core 3
$r_{1} / µ m$	Inner radius of high refractive index ring	3.00	3.00	3.00
$r_{2} / µ m$	Outer radius of high refractive index ring	4.00	4.00	4.00
$r_{3} / µ m$	Core radius	6.08	6.20	6.00
$r_{t} / µ m$	Inner radius of the trench	8.00	8.00	8.00
$h / µ m$	Trench thickness	4.00	4.00	4.00
$Λ / µ m$	Core pitch	/	42.00	/
$D / µ m$	Cladding diameter	/	240.00	/
$Δ_{1}$	High refractive index ring-core index contrast	0.20%	0.20%	0.20%
$Δ_{2}$	Core-cladding index contrast	0.92%	0.96%	0.88%
$Δ_{3}$	Trench-cladding index contrast	–0.70%	–0.70%	–0.70%

	Core 2
Core 1	${L P}_{01}$	${L P}_{11}$	${L P}_{21}$	${L P}_{02}$
${L P}_{01}$	–156.19	–122.10	–128.44	–101.47
${L P}_{11}$	–120.97	–132.01	–106.06	–116.00
${L P}_{21}$	–118.91	–113.38	–88.45	–75.90
${L P}_{02}$	–91.503	–120.57	–73.92	–56.35

	Core 3
Core 1	${L P}_{01}$	${L P}_{11}$	${L P}_{21}$	${L P}_{02}$
${L P}_{01}$	–158.00	–100.97	–111.80	–80.53
${L P}_{11}$	–112.19	–120.82	–107.90	–105.63
${L P}_{21}$	–121.48	–92.76	–80.59	–61.07
${L P}_{02}$	–94.94	–95.37	–66.58	–44.80

	LP
XT	${L P}_{01}$	${L P}_{11}$	${L P}_{21}$	${L P}_{02}$
${X T}_{c o r e 1 - c o r e 2}$	–162.97	–139.04	–97.40	–69.16
${X T}_{c o r e 1 - c o r e 3}$	–164.10	–129.41	–88.41	–54.22

Performance	Core	${L P}_{01}$	${L P}_{11}$	${L P}_{21}$	${L P}_{02}$
$A_{e f f} / µ m^{2}$	Core 1	84.77	109.29	122.97	73.50
	Core 2	86.27	111.07	124.17	73.56
	Core 3	84.01	108.58	123.82	74.29
$γ / W^{- 1} {\cdot k m}^{- 1}$	Core 1	1.2911	1.0014	0.8900	1.4890
	Core 2	1.2686	0.9835	0.8815	1.4879
	Core 3	1.3029	1.0057	0.8911	1.4733
$Δ n_{e f f}$	/	$\geq 2 \times 10^{- 3}$ ( ${L P}_{21 - 02}$ )
BL at 1625 nm	Core 1	$0.9684 \times 10^{- 3}$ ( ${L P}_{02}$ )
$(R = 30 m m) /$	Core 2	$0.1062 \times 10^{- 7}$ ( ${L P}_{02}$ )
(dB/100 truns)	Core 3	0.0401 ( ${L P}_{02}$ )

Abstract

Data availability

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Figures (9)

Tables (5)

Equations (10)

Journal of the Optical Society of America B