Design And Manufacture Of The Micro Mechanical Optical Switch

With the developing of optical transport network on the ultra-high-speed, large capacity, intelligent direction, network key issues are network survivability, network protection switching and restoration, smart choice to switch. Large capacity, high-speed switching, transparent, low-loss optical switches in optical networks are playing a more important role.In this thesis, we design and fabricate the 1X2 Miniature Optic-Mechanical switch (MOMS). The MOMS switch collimated beam optic is an epoxy-free optical path design implemented with laser welding technology, and comprises a combination of a fiber tube assembly (FTA), aspherical Lens, mirror and a movable wedge prism. The prism is moved by a telecom-grade relay actuator, contained within a hermetic package for high reliability. Switching is accomplished with a 5VDC(±10%) 25mA signal. Light follows the mirror path (1-2) when the prism is removed from the optical path, and passes through an optical prism (path 1-3) when the prism is placed in the optical path, The MOMS switch is contained in a miniature 7.83×10.4×17.3mm hermetic metal package. The package is directly mountable on PCB and equipped with status contacts that allow an electrical readout of the actual switch state. The optical power rating for this product is 500mW. The challenge of this structure is the stringent tolerance in mechanical processing and the repeatability of the moving prism. Moreover, my thesis also focuses on the design theory and the tolerance analysis of assembled parts, At last, we accomplished MOMS switch which passed Bellcore standard. In this experiment, the performances of insertion loss, return loss, polarization dependent loss, crosstalk, repeatability,switching time achieved respectively given as follows:0.5dB, 50dB,0.04dB,55dB,0.05dB and2-4ms.