Principle, Design, and Prototyping of Core Selective Switch Using Free-Space Optics for Spatial Channel Network
Principle, Design, and Prototyping of Core Selective Switch Using Free-Space Optics for Spatial Channel Network
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DOI：
10.1109/jlt.2020.3000304
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发表时间：
2020-09-15
影响因子：
4.7
通讯作者：
Ishikawa, Tsubasa
中科院分区：
文献类型：
--
作者：
Jinno, Masahiko;Kodama, Takahiro;Ishikawa, Tsubasa
描述了空分复用(SDM)时代空间信道(SCN)网络中基于自由空间光的核心选择开关(CS)的原理、设计和原型。SCN中的CS对应于当前波分复用网络中的传统波长选择开关(WSS)。它集成了从输入SDM端口对SCH进行空间解复用，以及将其中任何SCH交换和多路复用到任何输出SDM端口的功能。讨论了基于自由空间光纤的CSS的设计，该CSS适用于支持不同数目的每根多芯光纤(MCF)和不同数目的MCF端口数的CSSS。给出了一个集成了MCF准直器、空间复用器/解复用器阵列和硅上液晶空间光调制器的5核1 6css原型的实现实例。虽然一些输出MCF端口表现出相对较高的插入损耗(IL)，但CSS原型表明，CSS将潜在地提供大约2分贝的低净IL。为了验证CSS原型中没有未知的恶化因素，我们通过测量前向纠错比特误码率来测试在分层光交叉连接配置中实现的原型。在没有光信噪比损失的情况下，成功地实现了采用基于空间交叉连接和传统波长交叉连接的900 Gb/S SCH的空间旁路和频谱疏导。
We describe the principle, design, and prototyping of a free-space-optics-based core selective switch (CSS) for spatial channel (SCh) networks (SCNs) in the age of space division multiplexing (SDM). A CSS in an SCN corresponds to a conventional wavelength selective switch (WSS) in a current wavelength division multiplexing network. It incorporates functionalities for spatially demultiplexing SChs from an input SDM port and for switching and multiplexing any of them into any of output SDM ports. We discuss the design for free-space-optics-based CSSs that is applicable to CSSs supporting various numbers of cores per multicore fiber (MCF) and various numbers of MCF ports. We show an example of an implemented 5-core 1 6 CSS prototype that integrates an MCF collimator, spatial multiplexer/demultiplexer array, and liquid-crystal-on-silicon spatial light modulator. Although some output MCF ports exhibit relatively high insertion loss (IL), the CSS prototype shows that a CSS will potentially provide low net IL at the level of approximately 2 dB. To verify that there are no unknown deteriorating factors in the CSS prototype, we tested the prototype implemented in a hierarchical optical cross-connect configuration by measuring the pre-forward error correction bit error rate. Spatial bypassing and spectral grooming of a 900-Gb/s SCh employing a CSS-based spatial cross-connect and a conventional wavelength cross-connect are successfully demonstrated with no optical signal-to-noise ratio penalty.