A compact trench-assisted multi-orbital-angular-momentum multi-ring fiber for ultrahigh-density space-division multiplexing (19 rings × 22 modes).
A compact trench-assisted multi-orbital-angular-momentum multi-ring fiber for ultrahigh-density space-division multiplexing (19 rings × 22 modes).
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DOI：
10.1038/srep03853
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发表时间：
2014-01-24
影响因子：
4.6
通讯作者：
Wang J
中科院分区：
文献类型：
--
作者：
Li S;Wang J
提出了一种紧凑型（包层直径为130 μm）沟槽辅助多轨道角动量（OAM）多环光纤，该光纤有19个环，每个环支持22个模式，其中18个是OAM模式。 采用高对比度折射率环形和沟槽设计，沟槽辅助多OAM多环光纤（TA-MOMRF）在宽波长范围（1520至1630 nm）内具有低水平的模间串扰和环间串扰，这可能在单个TA-MOMRF中实现Pbit/s的总传输容量和数百bit/s/Hz的频谱效率。 分析了环的椭圆度和光纤弯曲引起的奇偶模有效折射率差对OAM模纯度和模耦合/串扰的影响。结果表明，高阶OAM模对光纤环的椭圆度和弯曲度有较好的容忍度。所设计的光纤对环的小椭圆率（在0.5%的椭圆率下<−22 dB串扰）和小弯曲半径（在2 cm的弯曲半径下<−20 dB串扰）都具有良好的容限。
We present a compact (130 μm cladding diameter) trench-assisted multi-orbital-angular-momentum (OAM) multi-ring fiber with 19 rings each supporting 22 modes with 18 OAM ones. Using the high-contrast-index ring and trench designs, the trench-assisted multi-OAM multi-ring fiber (TA-MOMRF) features both low-level inter-mode crosstalk and inter-ring crosstalk within a wide wavelength range (1520 to 1630 nm), which can potentially enable Pbit/s total transmission capacity and hundreds bit/s/Hz spectral efficiency in a single TA-MOMRF. Moreover, the effective refractive index difference of even and odd fiber eigenmodes induced by the ellipticity of ring and fiber bending and their impacts on the purity of OAM mode and mode coupling/crosstalk are analyzed. It is found that high-order OAM modes show preferable tolerance to the ring ellipticity and fiber bending. The designed fiber offers favorable tolerance to both small ellipticity of ring (<−22 dB crosstalk under an ellipticity of 0.5%) and small bend radius (<−20 dB crosstalk under a bend radius of 2 cm).
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影响因子：
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