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New refractive index profiles of dispersion-flattened highly nonlinear fibers for future all-optical signal processing in wdm optical networks

机译：wdm光网络中用于将来全光信号处理的色散平坦的高度非线性光纤的新折射率分布

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摘要

In this paper, we demonstrate new dissimilar refractive index profiles for highly nonlinear ultra-flattened dispersion fibers with noteworthy effective area for future optical signal processing. The newly proposed fibers named from Type 1 to Type 5 have a flattened dispersion over S, C, L and U bands. Predominantly, few-mode HNL-UFF fiber of Type 3 yields dispersion-flattened characteristics over a range of 250 nm of optical communication spectrum with a mere 0.2 ps/nm km variation in dispersion and a dispersion slope of km due to the contribution of higher-order modes to the dispersion characteristics of the fiber. Moreover, it has a moderate nonlinear coefficient of . By modifying the refractive index profile of Type 3 fiber, Type 4 and Type 5 fibers are obtained in order to ensure single-mode operation, while the zero flattened dispersion characteristics of the fiber are compromised. Among the newly proposed fibers, Type 4 fiber offers a very low ITU-T cutoff wavelength of , whereas in the case of Type 5 fiber it is . Moreover, Type 4 and Type 5 fibers have good nonlinear coefficients of and , respectively. By virtue of the proposed optimized index profile, an insensitive behavior toward bending is displayed by Type 3, Type 4 and Type 5 fibers. In addition, Type 4 fiber provides a better splice loss of 0.25 dB.
机译：在本文中，我们展示了高度非线性的超扁平色散光纤的新的不同折射率分布，并为未来的光信号处理提供了显着的有效面积。新提议的从类型1到类型5命名的光纤在S，C，L和U波段上具有平坦的色散。主要是，类型3的少模HNL-UFF光纤在250 nm的光通信频谱范围内产生色散平坦的特性，由于较高的贡献，其色散变化仅为0.2 ps / nm km，色散斜率仅为km光纤的色散特性的有序模式。此外，它具有适度的非线性系数。通过修改3型光纤的折射率分布，可以得到4型和5型光纤，以确保单模运行，同时损害了光纤的零展平色散特性。在新提出的光纤中，类型4的ITU-T截止波长非常低，而对于类型5的光纤则为。此外，类型4和类型5的纤维分别具有和的良好非线性系数。借助建议的最佳折射率分布，类型3，类型4和类型5纤维表现出对弯曲不敏感的行为。此外，类型4光纤可提供0.25 dB更好的熔接损耗。

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