The 2 $\mu \text{m}$ waveband, specifically near $1.9~\mu \text{m}$ , is an imperative resource that could possibly be exploited in future communications systems. This is due to the promising infrastructural developments at the wavelength region (hollow-core photonic bandgap fiber, thulium-doped fiber amplifier) near $1.9~\mu \text{m}$ . In this work, we report the 1 $\times N$ selector switch based on Mach-Zehnder interferometers operating near the $1.9~\mu \text{m}$ wavelength region. As an elementary cell ( $N $ = 2), an insertion loss as low as 1.1 dB, $\text{P}_{\pi }$ of 23 mW, 10-90% switching time of lower than 38 $\mu \text{s}$ and a crosstalk of lower than −25 dB from 1880 to 1955 nm has been determined. In order to prove scalability, the 1 $\times $ 8 switch $(N $ = 8) is demonstrated, indicating crosstalk as low as −21 dB, considering all possible switching configurations across the abovementioned wavelength region. Insertion loss levels are examined.

中文翻译：

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1 × N (N = 2, 8) 硅选择器开关，用于 2 μm 波段的前瞻性技术

2 $\mu \text{m}$ 波段，特别是靠近 $1.9~\mu \text{m}$ , 是一种势在必行的资源，可能会在未来的通信系统中加以利用。这是由于在波长区域（空心光子带隙光纤、掺铥光纤放大器）附近有前景的基础设施发展。 $1.9~\mu \text{m}$ . 在这项工作中，我们报告了1 $\times N$ 基于 Mach-Zehnder 干涉仪的选择器开关 $1.9~\mu \text{m}$ 波长区域。作为基本单元格（ $N $ = 2)，插入损耗低至 1.1 dB， $\text{P}_{\pi }$ 23 mW，10-90% 的开关时间低于 38 $\mu \text{s}$ 并且已确定从 1880 到 1955 nm 的串扰低于 -25 dB。为了证明可扩展性，1 $\times $ 8 转变 $(N $ = 8)被证明，表明串扰低至 -21 dB，考虑到上述波长区域的所有可能的开关配置。检查插入损耗水平。