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Ultra-low-loss multi-layer 8 × 8 microring optical switch
Photonics Research ( IF 7.6 ) Pub Date : 2023-04-12 , DOI: 10.1364/prj.479499 Xin Li, Wei Gao, Liangjun Lu, Jianping Chen, and Linjie Zhou
Photonics Research ( IF 7.6 ) Pub Date : 2023-04-12 , DOI: 10.1364/prj.479499 Xin Li, Wei Gao, Liangjun Lu, Jianping Chen, and Linjie Zhou
Microring-based optical switches are promising for wavelength-selective switching with the merits of compact size and low power consumption. However, the large insertion loss, the high fabrication, and the temperature sensitivity hinder the scalability of silicon microring optical switch fabrics. In this paper, we utilize a three-dimensional (3D) microring-based optical switch element (SE) on a multi-layer Si3N4-on-SOI platform to realize high-performance large-scale optical switch fabrics. The 3D microring-based SE consists of a Si/Si3N4 waveguide overpass crossing in the bottom and the top layers, and Si3N4 dual-coupled microring resonators (MRRs) in the middle layer. The switch is calibration-free and has low insertion loss. With the 3D microring-based SEs, we implement an 8×8 crossbar optical switch fabric. As the resonance wavelengths of all SEs are well aligned, only one SE needs to be turned on in each routing path, which greatly reduces the complexity of the switch control. The optical transmission spectra show a box-like shape, with a passband width of ∼69 GHz and an average on-state loss of ∼0.37 dB. The chip has a record-low on-chip insertion loss of 0.52–2.66 dB. We also implement a non-duplicate polarization-diversity optical switch by using the bidirectional transmission characteristics of the crossbar architecture, which is highly favorable for practical applications. 100 Gb/s dual-polarization quadrature-phase-shift-keying (DP-QPSK) signal is transmitted through the switch without significant degradation. To the best of our knowledge, this is the first time that 3D MRRs have been used to build highly scalable polarization-diversity optical switch fabrics.
中文翻译:
超低损耗多层8×8微环光开关
基于微环的光开关具有体积小和功耗低的优点,有望用于波长选择切换。然而,大的插入损耗、高制造和温度敏感性阻碍了硅微环光开关结构的可扩展性。在本文中,我们在多层Si 3 N 4 -on-SOI 平台上利用基于三维 (3D) 微环的光开关元件 (SE) 来实现高性能的大规模光开关结构。基于 3D 微环的 SE 由在底层和顶层交叉的Si / Si 3 N 4波导立交桥和Si 3 N 4中间层的双耦合微环谐振器 (MRR)。该开关无需校准且插入损耗低。通过基于 3D 微环的 SE,我们实现了8 × 8交叉光开关结构。由于所有SE的谐振波长对齐良好,每条路由路径只需要打开一个SE,大大降低了开关控制的复杂度。光传输光谱呈盒状,通带宽度为~ 69 GHz ,平均导通损耗为~ 0.37 dB . 该芯片的片上插入损耗创历史新低,为 0.52–2.66 dB。我们还利用交叉结构的双向传输特性实现了非重复偏振分集光开关,这对实际应用非常有利。100 Gb/s 双极化正交相移键控 (DP-QPSK) 信号通过开关传输而没有明显衰减。据我们所知,这是 3D MRR 首次用于构建高度可扩展的偏振分集光开关结构。
更新日期:2023-04-12
中文翻译:
超低损耗多层8×8微环光开关
基于微环的光开关具有体积小和功耗低的优点,有望用于波长选择切换。然而,大的插入损耗、高制造和温度敏感性阻碍了硅微环光开关结构的可扩展性。在本文中,我们在多层Si 3 N 4 -on-SOI 平台上利用基于三维 (3D) 微环的光开关元件 (SE) 来实现高性能的大规模光开关结构。基于 3D 微环的 SE 由在底层和顶层交叉的Si / Si 3 N 4波导立交桥和Si 3 N 4中间层的双耦合微环谐振器 (MRR)。该开关无需校准且插入损耗低。通过基于 3D 微环的 SE,我们实现了8 × 8交叉光开关结构。由于所有SE的谐振波长对齐良好,每条路由路径只需要打开一个SE,大大降低了开关控制的复杂度。光传输光谱呈盒状,通带宽度为~ 69 GHz ,平均导通损耗为~ 0.37 dB . 该芯片的片上插入损耗创历史新低,为 0.52–2.66 dB。我们还利用交叉结构的双向传输特性实现了非重复偏振分集光开关,这对实际应用非常有利。100 Gb/s 双极化正交相移键控 (DP-QPSK) 信号通过开关传输而没有明显衰减。据我们所知,这是 3D MRR 首次用于构建高度可扩展的偏振分集光开关结构。