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Two-Axis MEMS Lens Alignment System for Free-Space Optical Interconnect

机译:用于自由空间光学互连的两轴MEMS透镜对准系统

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摘要

We present a two-axis microelectromechanical systems (MEMS) lens aligner with a 260 μm × 220 μm translation range that positions a 6.35 mm lens with focal length f = 12.1 mm for alignment compensation of free-space optical interconnects (FSOIs) between computer servers separated by 50 mm spacing. Efficient ultrasonic linear piezoelectric motors (PMs) provide actuation with zero power required to hold the lens alignment. A four-channel FSOI is demonstrated with 1 × 4 vertical cavity surface-emitting laser (VCSEL) and photodiode (PD) arrays capable of 10 Gb/s transmission bandwidth. Demonstrated minimum step size of 1.68 μm is sufficient for aligning the 20 μm VCSEL spots onto the 40 μ m PD receivers. Force transmission between PMs and a silicon MEMS flexure stage is accomplished using a 1-mm steel ball bearing in a magnetic groove, providing compliance in the nondriven axis. The ball-coupling design has 15 μm backlash and induces a maximum of 8 μm of cross-axis motion.
机译:我们提出了一种平移范围为260μm×220μm的两轴微机电系统(MEMS)透镜对准器,该透镜对准器可放置一个焦距为f = 12.1 mm的6.35 mm透镜,用于计算机服务器之间的自由空间光学互连(FSOI)的对准补偿间隔50毫米。高效的超声线性压电马达(PM)可提供零功率驱动来保持镜头对准。演示了具有1×4垂直腔表面发射激光器(VCSEL)和能够提供10 Gb / s传输带宽的光电二极管(PD)阵列的四通道FSOI。演示的最小步长为1.68μm,足以将20μmVCSEL点对准40μm PD接收器。 PM和硅MEMS挠性平台之间的力传递是通过在磁槽中使用1毫米钢球轴承完成的,从而提供了非驱动轴的柔度。球耦合设计具有15μm的反冲,并引起最多8μm的横轴运动。

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