All-fiber mode selective couplers for mode-division-multiplexed optical transmission
All-fiber mode selective couplers for mode-division-multiplexed optical transmission
复制标题
用于模分复用光传输的全光纤模式选择耦合器
DOI：
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发表时间：
2017
期刊：
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通讯作者：
J. Lee
中科院分区：
文献类型：
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作者：
S. Chang;Kwangjoon Kim;J. Lee
全光纤模式选择耦合器（MSC）由少模光纤（FMF）和单模光纤（SMF）组成，将SMF的LP01模式耦合到FMF的特定高阶模式（HOM）。为了实现高耦合比和低插入损耗，需要满足SMF臂的LP01模式与FMF臂的HOM之间的相位匹配条件。抛光型MSC是通过使它们的核心紧密接触而制成的。棱镜耦合与抛光耦合器块可以精确测量模式的有效折射率。我们提出并演示了三种由连续MSC组成的全光纤模式复用器。 4模式复用器可以通过级联LP11、LP21和LP02 MSC来复用LP01、LP11、LP21和LP02 4种模式。用于120Gb/s DP-QPSK信号的三种模式的MDM传输。为了通过同时接收简并LP模式来增强信号传输性能，提出了一种利用两倍简并LP11模式的模式复用器。它由两个连续的LP11 MSC组成，允许复用LP01模式和两个正交的LP11模式。我们演示了 30 个波长通道（间隔为 33.3 GHz）的 WDM 传输，每个通道承载 3 个模式，FMF 超过 560 km。 6模式复用器可以复用LP01、LP11a、LP11b、LP21a、LP21b、LP02模式6种模式。我们演示了使用全光纤 6 模复用器的 WDM-MDM 传输。本文综述了基于MSC的全光纤模式复用器的制造方法和最新进展。通过实验证明了全光纤模式复用器的长距离模分复用 (MDM) 光信号传输。
All-fiber mode selective coupler (MSC) is comprised of a few mode fiber (FMF) and a single mode fiber (SMF), coupling the LP01 mode of the SMF to a specific higher-order mode (HOM) of the FMF. In order to achieve high coupling ratio and low insertion loss, phase-matching condition between the LP01 mode of SMF arm and the HOM of FMF arm should be satisfied. A polished-type MSC is made by getting their cores into intimate contact. Prism coupling with a polished coupler block can measure the effective refractive index of the mode accurately. We propose and demonstrate three kinds of allfiber mode multiplexer that is composed of consecutive MSCs. 4-mode multiplexer can multiplex 4 modes of LP01, LP11, LP21, and LP02 by cascading LP11, LP21, and LP02 MSCs. It is used for MDM transmission of three modes with 120 Gb/s DP-QPSK signals. In order to enhance the signal transmission performance by receiving degenerate LP modes simultaneously, a mode multiplexer to utilize two-fold degenerate LP11 modes is proposed. It is composed of two consecutive LP11 MSCs that allows the multiplexing of LP01 mode and two orthogonal LP11 modes. We demonstrates WDM transmission of 30 wavelength channels with 33.3 GHz spacing, each carrying 3 modes, over 560 km of FMF. 6- mode multiplexer can multiplex 6 modes of LP01, LP11a, LP11b, LP21a, LP21b, LP02 modes. We demonstrated WDM-MDM transmission with the all-fiber 6-mode multiplexer. In this paper, the manufacturing method and the recent advancements of the all-fiber mode multiplexer based on the MSCs are reviewed. Long-distance mode division multiplexing (MDM) optical signal transmissions with the all-fiber mode multiplexer are experimentally demonstrated.