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Optimized design method for trench-assisted grade-index ring-core fiber with low DMD and large Aeff
Author(s): Xihui Qiao; Jiajing Tu; Keping Long
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Paper Abstract

We propose a kind of trench-assisted graded-index ring-core fiber (TA-GI-RCF) with a low refractive index rod deployed in the center of the core, which supports three LP modes (LP01, LP11 and LP21) transmission. There are two difficulties about designing TA-GI-RCF, one is to depart LP21 mode from LP02 mode because their effective indices are too close which makes it difficult to realize only three LP modes transmission; the other one is how to make sure these three LP modes reach the receiver end with low differential mode delay (DMD), so that the computation complexity of multi-input multi-output (MIMO) digital signal process (DSP) can be reduced. At first, we realize the separation of LP21 mode and LP02 mode in TA-GI-RCF by enlarging the size of low refractive index rod. We next investigate the influence of the TA-GI-RCF structural parameters on DMD and DMD slope, and find that a graded-index core and a low refractive index rod can flexibly tune the DMD, and a trench can flexibly control the DMD slope. Through optimizing the core parameters, we find that the design region of α is 1.01~2.23 and that of Δ1 is 0.28%~0.46% at r1=30 μm, where α is the profile exponent and Δ1 is the relative refractive index difference between core and cladding. Simulation results show that TA-GI-RCF can achieve the effective area (Aeff) of LP01 mode over 2000 μm2 and the |DMD| between LP01 mode and LP11 mode is ≤100 ps/km over C+L band. Above all, we can achieve three LP modes transmission in TA-GIRCF with low DMD over whole C+L band and large Aeff.

Paper Details

Date Published: 28 February 2017
PDF: 7 pages
Proc. SPIE 10256, Second International Conference on Photonics and Optical Engineering, 1025632 (28 February 2017); doi: 10.1117/12.2257787
Show Author Affiliations
Xihui Qiao, Univ. of Science and Technology Beijing (China)
Jiajing Tu, Univ. of Science and Technology Beijing (China)
Keping Long, Univ. of Science and Technology Beijing (China)


Published in SPIE Proceedings Vol. 10256:
Second International Conference on Photonics and Optical Engineering
Chunmin Zhang; Anand Asundi, Editor(s)

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