1 × N (N = 2, 8) Silicon selector switch for prospective technologies at the 2 μm waveband

Sia, Jia Xu Brian, Li, Xiang, Qiao, Zhongliang, Guo, Xin, Zhou, Jin, Littlejohns, Callum G., Liu, Chongyang, Reed, Graham T., Wang, Wanjun and Wang, Hong (2020) 1 × N (N = 2, 8) Silicon selector switch for prospective technologies at the 2 μm waveband. IEEE Photonics Technology Letters, 32 (18), 1127-1130. (doi:10.1109/LPT.2020.3014204).

Abstract

The 2 µm waveband, specifically near 1.9 µm, 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 µm. In this work, we report the 1 × N selector switch based on Mach-Zehnder interferometers operating near the 1.9 µm wavelength region. As an elementary cell (N = 2), an insertion loss as low as 1.1 dB, P_π of 23 mW, 10-90 % switching time of lower than 38 µs and a crosstalk of lower than -25 dB from 1880 to 1955 nm has been determined. In order to prove scalability, the 1 × 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.

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