Low cross talk homogeneous seven-core five-LP mode fiber based on a high and low refractive index double ring

Luyao Wang; Shuguang Li; Xiaojian Meng; Ying Guo; Zenghui Li

doi:10.1364/JOSAB.434680

Journal of the Optical Society of America B
Vol. 38,
Issue 12,
pp. 3849-3857
(2021)
•https://doi.org/10.1364/JOSAB.434680

Low cross talk homogeneous seven-core five-LP mode fiber based on a high and low refractive index double ring

Luyao Wang, Shuguang Li, Xiaojian Meng, Ying Guo, and Zenghui Li

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Luyao Wang, Shuguang Li, Xiaojian Meng, Ying Guo, and Zenghui Li, "Low cross talk homogeneous seven-core five-LP mode fiber based on a high and low refractive index double ring," J. Opt. Soc. Am. B 38, 3849-3857 (2021)

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Abstract

We propose a what we believe is a novel, to the best of our knowledge, high and low refractive index double-ring (HL-DR) structure in few-mode multicore fibers (FM-MCFs) to simultaneously suppress intercore cross talk (XT) and intermodal cross talk. The fabrication methods of HL-DR seven-core fiber are introduced. A series of intercore XT values are calculated by the average power coupling coefficient, which shows that the HL-DR structure has a great contribution to meet the intercore XT target of less than ${-}{{30}}\;{\rm{dB/100}}\;{\rm{km}}$ in FM-MCFs. Intermodal XT is mainly measured by the effective refractive index difference ($\Delta {n_{{\rm{eff}}}}$) between modes, and the $\Delta {n_{{\rm{eff}}}}$ between any two adjacent modes is larger than ${{2}} \times {{1}}{{{0}}^{- 3}}$. Other main fiber properties, including bending loss and dispersion, are also simulated by the finite-element method. The results imply that the bending loss can satisfy the requirement of five-LP mode operation over the C ${+}$ L band. In addition, the dispersion comparison of ${{\rm{LP}}_{01}}$ mode illustrates that the fiber dispersion performance is not significantly influenced by the addition of the HL-DR structure. Through numerical analyses, an optimal HL-DR seven-core five-LP mode fiber with low XT is obtained, and it has a relative core multiplicity factor (RCMF) of 62.17. The proposed structure targets the design and application of space division multiplexing fibers with high capacity and independent channels.

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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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Symbol	Item	Initial Value
$r_{1}$	Position of inner ring	3.5 µm
$r_{2}$	Width of inner ring	2 µm
$a$	Core radius	7 µm
$b$	Width of inner cladding	2 µm
$e$	Width of outer ring	6.5 µm
$Δ n_{1}$	Relative RI difference between core and cladding	0.89%
$Δ_{1}$	RI difference between core and cladding	0.0129 (at 1550 nm)
$Δ n_{2}$	Relative RI difference between outer ring and cladding	−0.7%
$Δ_{2}$	RI difference between outer ring and cladding	−0.0101 (at 1550 nm)
$Δ n_{r - c}$	Relative RI difference between inner ring and core	0.2%
$Δ_{r - c}$	RI difference between inner ring and core	0.0029 (at 1550 nm)
$Λ$	Core pitch	42 µm
$C D$	Cladding diameter	150 µm
$C T$	Cladding thickness	33 µm

	Core 1
Core 2	${L P}_{01}$	${L P}_{11}$	${L P}_{21}$	${L P}_{02}$	${L P}_{31}$
${L P}_{01}$	−112.47	−107.93	−102.39	−100.86	−99.07
${L P}_{11}$	−99.38	−98.60	−91.61	−89.55	−87.19
${L P}_{21}$	−80.01	−75.05	−69.86	−69.47	−67.87
${L P}_{21}$	−59.49	−55.87	−51.20	−48.64	−49.32
${L P}_{31}$	−46.20	−41.44	−36.33	−36.25	−34.44

Performance	${L P}_{01}$	${L P}_{11}$	${L P}_{21}$	${L P}_{02}$	${L P}_{31}$
$Δ n_{e f f}$	0.0024 ( ${L P}_{01 - 11}$ ), 0.0036 ( ${L P}_{11 - 21}$ ), 0.0022 ( ${L P}_{21 - 02}$ ), 0.0023 ( ${L P}_{02 - 31}$ )
Intercore XT (dB/100 km)	−133.06	−119.77	−86.48	−61.75	−44.66
$A_{e f f}$ ( $u m^{2}$ )	114.58	134.38	144.71	79.26	155.35
BL of ${L P}_{31}$ at 1625 nm ( $R = 30 m m$ )	0.03 dB/100turns
Dispersion coefficient [ps/(nm·km)]	24.76	30.16	34.09	32.26	34.76
DMGD (ps/m)	7.79 ( ${L P}_{11 - 01}$ ), 15.78 ( ${L P}_{21 - 01}$ ), 12.30 ( ${L P}_{02 - 01}$ ), 23.14 ( ${L P}_{31 - 01}$ )
RCMF	62.17

Refs.	Core Count	Mode Count	Assisted Structure	CD (µm)	$Λ$ (µm)	${L P}_{01}$ - $A_{e f f}$ ( $µ m^{2}$ )	Intercore XT (dB/100 km)	RCMF
Our work	7	8	HL-DR	150	45	114.58	−44.66	62.17
[8]	7	3	Air hole	192	40	113	about −20	16.8
[9]	7	6	Air hole	125	35	123.5	−32	84.92
[27]	7	3	-	204	over 52	over 100	−30	14.8
[28]	7	1	Trench	186	55	over 140	−40	about 5.57
[29]	7	6	Trench	171	44.1	88.6	below −30	54

Symbol	Item	Initial Value
$r_{1}$	Position of inner ring	3.5 µm
$r_{2}$	Width of inner ring	2 µm
$a$	Core radius	7 µm
$b$	Width of inner cladding	2 µm
$e$	Width of outer ring	6.5 µm
$Δ n_{1}$	Relative RI difference between core and cladding	0.89%
$Δ_{1}$	RI difference between core and cladding	0.0129 (at 1550 nm)
$Δ n_{2}$	Relative RI difference between outer ring and cladding	−0.7%
$Δ_{2}$	RI difference between outer ring and cladding	−0.0101 (at 1550 nm)
$Δ n_{r - c}$	Relative RI difference between inner ring and core	0.2%
$Δ_{r - c}$	RI difference between inner ring and core	0.0029 (at 1550 nm)
$Λ$	Core pitch	42 µm
$C D$	Cladding diameter	150 µm
$C T$	Cladding thickness	33 µm

Abstract

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Tables (5)

Equations (10)

Journal of the Optical Society of America B