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Principle, Design, and Prototyping of Core Selective Switch Using Free-Space Optics for Spatial Channel Network
Journal of Lightwave Technology ( IF 4.1 ) Pub Date : 2020-09-15 , DOI: 10.1109/jlt.2020.3000304
Masahiko Jinno , Takahiro Kodama , Tsubasa Ishikawa

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.

中文翻译:

用于空间信道网络的自由空间光学核心选择开关的原理、设计和原型设计

我们描述了空分复用 (SDM) 时代空间信道 (SCh) 网络 (SCN) 的基于自由空间光学的核心选择开关 (CSS) 的原理、设计和原型设计。SCN中的CSS对应于当前波分复用网络中的常规波长选择开关(WSS)。它结合了用于从输入 SDM 端口空间解复用 SCh 以及将其中任何一个交换和复用到任何输出 SDM 端口的功能。我们讨论了基于自由空间光学的 CSS 的设计,它适用于支持每多芯光纤 (MCF) 的各种核心数和各种 MCF 端口的 CSS。我们展示了一个已实现的 5 核 1 × 6 CSS 原型示例,该原型集成了 MCF 准直器、空间复用器/解复用器阵列,和硅基液晶空间光调制器。尽管某些输出 MCF 端口表现出相对较高的插入损耗 (IL),但 CSS 原型显示 CSS 可能会提供大约 2 dB 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误码率来测试在分层光交叉连接配置中实现的原型。采用基于 CSS 的空间交叉连接和传统波长交叉连接的 900-Gb/s SCh 的空间旁路和频谱修饰已成功证明,没有光信噪比损失。CSS 原型显示 CSS 可能提供大约 2 dB 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误码率来测试在分层光交叉连接配置中实现的原型。采用基于 CSS 的空间交叉连接和传统波长交叉连接的 900-Gb/s SCh 的空间旁路和频谱修饰已成功证明,没有光信噪比损失。CSS 原型显示 CSS 可能提供大约 2 dB 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误码率来测试在分层光交叉连接配置中实现的原型。采用基于 CSS 的空间交叉连接和传统波长交叉连接的 900-Gb/s SCh 的空间旁路和频谱修饰已成功证明,没有光信噪比损失。
更新日期:2020-09-15
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