Watanabe Tatsuhiko, Bitachon Bertold Ian, Fedoryshyn Yuriy, Baeuerle Benedikt, Ma Ping, Leuthold Juerg
Opt Express. 2020 Nov 23;28(24):36009-36019. doi: 10.1364/OE.406251.
We demonstrate an on-chip coherent mode scrambling demultiplexer for polarization multiplexed few mode signals. The device has been fabricated in the standard silicon-on-insulator platform. The mode demultiplexer consists of an array of 2D grating couplers for dual polarization few mode fiber-to-chip coupling and optical hybrids realized by 4×4 MMIs. The array of perfect vertical 2D grating couplers allows us an efficient fiber-to-chip coupling with experimental peak coupling efficiencies of -5.2 dB and -9.0 dB at 1570 nm for LP and LP modes, respectively, while simulated coupling efficiencies at 1550 nm are -3.6 dB and -3.3 dB for LP and LP, respectively. We successfully performed a back-to-back three LP modes division multiplexing transmission experiment with single polarization 32 Gbaud QPSK signals using the fabricated mode demultiplexer relying on offline MIMO DSP techniques.
我们展示了一种用于偏振复用少模信号的片上相干模式扰码解复用器。该器件是在标准绝缘体上硅平台上制造的。模式解复用器由用于双偏振少模光纤到芯片耦合的二维光栅耦合器阵列和由4×4多模干涉仪实现的光学混合器组成。完美垂直二维光栅耦合器阵列使我们能够实现高效的光纤到芯片耦合，在1570nm处，LP和LP模式的实验峰值耦合效率分别为-5.2dB和-9.0dB，而在1550nm处，LP和LP的模拟耦合效率分别为-3.6dB和-3.3dB。我们使用制造的模式解复用器，依靠离线多输入多输出数字信号处理技术，成功地进行了单偏振32Gbaud QPSK信号的背对背三LP模式分复用传输实验。
