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Abstract

Aiming at solving the problems of coupling between modes in a core and mode coupling between cores in few-mode multi-core fiber, a fiber with seven cores each with step index is proposed, and each core can support five modes. Each core has a central low refractive index region and a high refractive index ring to ensure that there is a large refractive index difference between modes in the core, so as to reduce the problem of mode coupling. The bending loss of central core and outer core, the crosstalk characteristics between modes and the influence of core parameters on crosstalk performance are simulated and analyzed by the finite element method. The simulation results show that at a wavelength of 1.55 μm and a bending radius of 50 mm, the bending loss of the proposed multi-core fiber is much lower than its attenuation loss, and the crosstalk between the adjacent cores of the five core modes are less than –20 dB/100 km. Therefore, this multi-core fiber can realize independent transmission of the core modes with long-distance under small bending radius.

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Authors and contacts

Corresponding author:Chen Ming-Yang,miniyoung@163.com

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DownLoad: Full-Size Img PowerPoint

		XT/[dB·(100 km)^–1]
Core 2		LP_11b	LP_11b	LP_21b	LP_21b	LP_31b	LP_31b
Core 1	LP_11b	–92.84	–129.70	–125.62	–95.26	–118.93	–116.99
	LP_11b	–124.63	–92.86	–99.26	–135.26	–123.78	–120.89
	LP_21b	–79.30	–82.52	–63.70	–72.51	–90.05	–93.15
	LP_21b	–60.43	–69.32	–71.89	–63.78	–89.96	–89.17
	LP_31b	–33.35	–44.74	–46.39	–35.01	–28.76	–46.20
	LP_31b	–41.08	–33.92	–34.12	–50.58	–49.63	–28.19

DownLoad: CSV

Year	Number of fiber cores	Structure of fiber core	Cladding diameter/μm	Bending radius/mm	Bending loss	Crosstalk/dB (Transmission distance)
2012^[24]	7	Hole-assisted	225	140	0.242 dB/km	–60 (1 km)
2015^[25]	36	Trench-assisted	200	140	0.001 dB/km	–31 (5.5 km)
2017^[26]	12	Trench-assisted	230	210	0.05 dB/100 turns	–48 (500 km)
2019^[27]	8	Differential inner-cladding	160	30	0.0049 dB/100 turns	< –50 (100 km)
2020^[28]	7	Hole-assisted	125	80	2.20 × 10^–6dB/m	–32 (100 km)
Our design	7	Ring-core structure	180	50	2.77 × 10^–8dB/m	–116 (100 km)

DownLoad: CSV

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Vol. 71, Issue 9 - 2022-05-05

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