A system and method for directly measuring the alignment error in a fiber-optic coupler is disclosed. In one embodiment, an optical switch utilizes a beam deflection mirror. When the beam deflection mirror directs an incident light beam to a particular fiber, the incident light beam may enter the fiber...http://www.google.com.tw/patents/US6188472?utm_source=gb-gplus-share專利 US6188472 - System and method for direct measurement of alignment error in a fiber coupler
