Weakly-coupled 7-core-2-LP-mode transmission using commercial SFP + transceivers enabled by all-fiber spatial multiplexer and demultiplexer

Yuyang Gao; Jian Cui; Junchi Jia; Dawei Ge; Chunyan Du; Yichi Zhang; Huang Yu; Zhengbin Li; Yongqi He; Zhangyuan Chen; Juhao Li

doi:10.1364/OE.27.016271

Optics Express
Vol. 27,
Issue 11,
pp. 16271-16280
(2019)
•https://doi.org/10.1364/OE.27.016271

Weakly-coupled 7-core-2-LP-mode transmission using commercial SFP + transceivers enabled by all-fiber spatial multiplexer and demultiplexer

Yuyang Gao, Jian Cui, Junchi Jia, Dawei Ge, Chunyan Du, Yichi Zhang, Huang Yu, Zhengbin Li, Yongqi He, Zhangyuan Chen, and Juhao Li

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Yuyang Gao, Jian Cui, Junchi Jia, Dawei Ge, Chunyan Du, Yichi Zhang, Huang Yu, Zhengbin Li, Yongqi He, Zhangyuan Chen, and Juhao Li, "Weakly-coupled 7-core-2-LP-mode transmission using commercial SFP + transceivers enabled by all-fiber spatial multiplexer and demultiplexer," Opt. Express 27, 16271-16280 (2019)

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- Optical Communications and Interconnects
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About this Article
History
- Original Manuscript: March 14, 2019
- Revised Manuscript: May 10, 2019
- Manuscript Accepted: May 10, 2019
- Published: May 23, 2019

Abstract

Spatial division multiplexing transmission over few-mode multicore fiber (FM-MCF) recently attracts great interests by simultaneously exploiting two more dimensions than conventional single mode fibers. In this paper, we propose an all-fiber spatial multiplexer (MUX) by cascading mode-selective fiber couplers (MSCs) with a fiber-bundle-type fan-in device, and spatial demultiplexer (DEMUX) by cascading a fiber-bundle-type fan-out device with degenerate-mode-selective fiber couplers and MSCs. Thanks to the low crosstalk of the FM-MCF, spatial MUX/DEMUX and their coupling, weakly-coupled 7-core-2-LP-mode real-time transmission over 1-km of FM-MCF is successfully demonstrated using 10-Gbps commercial enhanced small form-factor pluggable (SFP + ) transceivers.

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Fig. 1 Cascaded structure of the all-fiber spatial MUX/DEMUX.

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Fig. 2 (a) Cross-section of the fabricated FM-MCF. (b) 2D refractive index profile of the FM-MCF. (c) Refractive index profile of one core of the FM-MCF.

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Fig. 3 (a) The fabricated FI/FO devices. (b) End face of the fiber-bundle-type FI/FO devices. (c) The cascaded mode MUX and DEMUX.

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Fig. 4 IL of LP₁₁ DMSC and MSC with 50 randomly orientated LP₁₁ mode injection (a) over the C-band (b) at 1550 nm. (c) IL of LP₀₁ MSC with LP₀₁/LP₁₁ mode injection and IL of LP₁₁ DMSC with LP₀₁ injection over the C-band.

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Fig. 5 (a) Experimental setup of the entire SDM link. (b) Mode patterns out of the spatial MUX.

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Fig. 6 Experimental setup of the real-time SDM transmission.

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Fig. 7 BER curves of (a) B2B MDM transmission at 1550 nm. (b) MDM transmission over core 1 at 1550 nm. (c) MDM transmission over core 1 at 1530 nm. (d) MDM transmission over core 1 at 1570 nm.

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Fig. 8 BER curves of MDM transmission over core 2-7 at 1550 nm.

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Tables (2)

Table 1 Insertion Loss of the FI/FO devices (Unit: dB)

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Table 2 IL and Modal XT Matrix of the entire SDM link (Unit: dB)

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	LP₀₁ injection		LP₁₁ injection
	Fan in + 1 km	Fan out	Fan in + 1 km	Fan out
Core 1	0.71	0.33	0.78	0.23
Core 2 (central)	0.37	0.1	0.41	0.1
Core 3	1.1	0.23	1.06	0.48
Core 4	0.56	0.18	0.7	0.33
Core 5	0.74	0.41	0.87	0.29
Core 6	0.74	0.5	1.1	0.4
Core 7	0.71	0.48	0.54	0.23

Core 1 1550nm	LP₀₁ out	LP₁₁ out	Core 1 1530nm	LP₀₁ out	LP₁₁ out	Core 1 1570nm	LP₀₁ out	LP₁₁ out
LP₀₁ in	−2.34	−14.26	LP₀₁ in	−2.1	−15.73	LP₀₁ in	−3.93	−15.9
LP₁₁ in	−15.65	−3.38	LP₁₁ in	−21.6	−4.67	LP₁₁ in	−19.8	−5.6
Core 2	LP₀₁ out	LP₁₁ out	Core 3	LP₀₁ out	LP₁₁ out	Core 4	LP₀₁ out	LP₁₁ out
LP₀₁ in	−2.52	−14.26	LP₀₁ in	−3.18	−15.6	LP₀₁ in	−3.3	−16.6
LP₁₁ in	−13.22	−3.1	LP₁₁ in	−19.2	−3.99	LP₁₁ in	−16.01	−4.4
Core 5	LP₀₁ out	LP₁₁ out	Core 6	LP₀₁ out	LP₁₁ out	Core 7	LP₀₁ out	LP₁₁ out
LP₀₁ in	−2.77	−15.71	LP₀₁ in	−3.67	−15.43	LP₀₁ in	−3.22	−15.7
LP₁₁ in	−14.78	−5.5	LP₁₁ in	−14.76	−4.51	LP₁₁ in	−20.19	−5.22

	LP₀₁ injection		LP₁₁ injection
	Fan in + 1 km	Fan out	Fan in + 1 km	Fan out
Core 1	0.71	0.33	0.78	0.23
Core 2 (central)	0.37	0.1	0.41	0.1
Core 3	1.1	0.23	1.06	0.48
Core 4	0.56	0.18	0.7	0.33
Core 5	0.74	0.41	0.87	0.29
Core 6	0.74	0.5	1.1	0.4
Core 7	0.71	0.48	0.54	0.23

Core 1 1550nm	LP₀₁ out	LP₁₁ out	Core 1 1530nm	LP₀₁ out	LP₁₁ out	Core 1 1570nm	LP₀₁ out	LP₁₁ out
LP₀₁ in	−2.34	−14.26	LP₀₁ in	−2.1	−15.73	LP₀₁ in	−3.93	−15.9
LP₁₁ in	−15.65	−3.38	LP₁₁ in	−21.6	−4.67	LP₁₁ in	−19.8	−5.6
Core 2	LP₀₁ out	LP₁₁ out	Core 3	LP₀₁ out	LP₁₁ out	Core 4	LP₀₁ out	LP₁₁ out
LP₀₁ in	−2.52	−14.26	LP₀₁ in	−3.18	−15.6	LP₀₁ in	−3.3	−16.6
LP₁₁ in	−13.22	−3.1	LP₁₁ in	−19.2	−3.99	LP₁₁ in	−16.01	−4.4
Core 5	LP₀₁ out	LP₁₁ out	Core 6	LP₀₁ out	LP₁₁ out	Core 7	LP₀₁ out	LP₁₁ out
LP₀₁ in	−2.77	−15.71	LP₀₁ in	−3.67	−15.43	LP₀₁ in	−3.22	−15.7
LP₁₁ in	−14.78	−5.5	LP₁₁ in	−14.76	−4.51	LP₁₁ in	−20.19	−5.22

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