Spatial Channel Network (SCN): Opportunities and Challenges of Introducing Spatial Bypass Toward the Massive SDM Era
Spatial Channel Network (SCN): Opportunities and Challenges of Introducing Spatial Bypass Toward the Massive SDM Era
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DOI：
10.1364/jocn.11.000001
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发表时间：
2019-03-01
影响因子：
5
通讯作者：
Jinno, Masahiko
中科院分区：
文献类型：
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作者：
Jinno, Masahiko
考虑到到2024年商用10-Tb/s光接口在1-P B/s光传输系统中工作的中期预测，并回顾21世纪初进入波长丰富时代时引入的光旁路，我们根据即将到来的大规模空分复用（SDM）时代重新评估分层光网络架构的价值。我们介绍了一个空间信道（SCh）网络（SCN）架构，其中的SDM层被明确定义为一个新的网络层，支持新的复用技术的SDM。在SCN中，容纳在快速SCh中的光信道（OCh）使用路由上的空间交叉连接（SXC）绕过覆盖的波长交叉连接（WXC）。作为SCN将呈现的一个挑战，我们指出，过大的SXC插入损耗降低了光谱修饰OCh的光学范围。我们表明，光到达的频谱梳理OCh可以保持在几乎相同的水平，通过传统的单层WDM网络传输的OCh由于市售的空间开关和可预见的低损耗SDM复用器和解复用器的低损耗功能。作为另一个挑战，我们讨论如何实现可增长的，可靠的和具有成本效益的SXC。我们提出了两个SXC架构的基础上，子矩阵开关和核心选择开关。简单的成本评估表明，所提出的架构比全尺寸的矩阵交换机为基础的架构，1 + 1设备保护和传统的堆叠WXC架构的成本效益。
Considering middle-term predictions of the need for commercial 10-Tb/s optical interfaces working in 1-P b/s optical transport systems by 2024 and recalling the introduction of the optical bypass when entering the wavelength-abundant era in the early 2000s, we re-evaluate the values of hierarchical optical network architecture in light of the forthcoming massive spatial division multiplexing (SDM) era. We introduce a spatial channel (SCh) network (SCN) architecture, where the SDM layer is explicitly defined as a new networking layer that supports the new multiplexing technology of SDM. In an SCN, optical channels (OChs) accommodated in an express SCh bypass the overlying wavelength cross-connects (WXCs) using spatial cross-connects (SXCs) on the route. As one challenge that SCNs will present, we point out that an excessively large SXC insertion loss reduces the optical reach for spectrally groomed OChs. We show that the optical reach of spectrally groomed OChs can be maintained at almost the same level as that for an OCh transported through a conventional single-layer WDM network thanks to the low-loss features of commercially available spatial switches and foreseeable low-loss SDM multiplexers and demultiplexers. As another challenge, we discuss how to achieve growable, reliable, and cost-effective SXCs. We propose two SXC architectures based on sub-matrix switches and core-selective switches. Simple cost assessment shows that the proposed architectures are more cost-effective than the full-size matrix switch-based architecture with 1 + 1 equipment protection and conventional stacked WXC architecture.