Design of eight-mode polarization-maintaining few-mode fiber for multiple-input multiple-output-free spatial division multiplexing

Lixian Wang; Sophie LaRochelle

doi:10.1364/OL.40.005846

Optics Letters
Vol. 40,
Issue 24,
pp. 5846-5849
(2015)
•https://doi.org/10.1364/OL.40.005846

Design of eight-mode polarization-maintaining few-mode fiber for multiple-input multiple-output-free spatial division multiplexing

Lixian Wang and Sophie LaRochelle

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Lixian Wang and Sophie LaRochelle, "Design of eight-mode polarization-maintaining few-mode fiber for multiple-input multiple-output-free spatial division multiplexing," Opt. Lett. 40, 5846-5849 (2015)

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Abstract

We propose a polarization-maintaining few-mode fiber (FMF) that features an elliptical ring shaped core with a high refractive index contrast $\sim 0.03$ between the core and the cladding. This fiber design alleviates the usual trade-off between the number of guided modes and the achievable birefringence that is usually observed in conventional elliptical-core FMFs. Through numerical simulations, we show that this fiber design can support up to 10 guided vector modes over the entire C band while providing large birefringence. Except for the two fundamental modes, the eight higher-order vector modes are all separated from their adjacent modes by effective index differences $> 10^{- 4}$ , which is the typical birefringence value of single-mode polarization maintaining fibers. The designed fiber targets applications in spatial division multiplexing of optical channels, without multiple-input–multiple-output (MIMO) digital signal processing, for short-reach optical interconnects.

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		${LP}_{01}^{y}$	${LP}_{01}^{x}$	${LP}_{11 a}^{y}$	${LP}_{11 a}^{x}$	${LP}_{11 b}^{x}$	${LP}_{11 b}^{y}$	${LP}_{21 a}^{x}$	${LP}_{21 a}^{y}$	${LP}_{21 b}^{x}$	${LP}_{21 b}^{y}$
No bending	$n_{eff}$	1.45592	1.45590	1.45491	1.45479	1.45210	1.45182	1.44853	1.44841	1.44802	1.44790
No bending	$Δ n_{eff}$	$1.31 E ‐ 5$	$9.89 E ‐ 4$	$1.24 E ‐ 4$	$2.69 E ‐ 3$	$2.75 E ‐ 4$	$3.29 E ‐ 3$	$1.28 E ‐ 4$	$3.89 E ‐ 4$	$1.19 E ‐ 4$
$R_{bend} = 1 cm$	$α$	--	--	$2.5 E ‐ 10$	$2.2 E ‐ 10$	$1.2 E ‐ 9$	--	$3.7 E ‐ 6$	$4.9 E ‐ 6$	$7.1 E ‐ 6$	$1.1 E ‐ 5$
Along x-axis	$Δ n_{eff}$	$2.57 E ‐ 5$	$1.19 E ‐ 3$	$1.11 E ‐ 4$	$2.58 E ‐ 3$	$2.74 E ‐ 4$	$3.30 E ‐ 3$	$1.27 E ‐ 4$	$3.97 E ‐ 4$	$1.20 E ‐ 4$
$R_{bend} = 1 cm$	$α$	--	--	--	--	$1.4 E ‐ 10$	$1.3 E ‐ 9$	$1.4 E ‐ 6$	$2.3 E ‐ 6$	$6.1 E ‐ 6$	$9.1 E ‐ 6$
Along y-axis	$Δ n_{eff}$	$1.17 E ‐ 5$	$9.97 E ‐ 4$	$1.24 E ‐ 4$	$2.69 E ‐ 3$	$2.72 E ‐ 4$	$3.29 E ‐ 3$	$1.29 E ‐ 4$	$3.81 E ‐ 4$	$1.19 E ‐ 4$

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Optics Letters