Authors: Jeongsik Sin, Dan Popa, and Harry E. Stephanou Company: Rensselaer Polytechnic Inst. Date Published: 12/3/2002
NEPCON West - Fiberoptic Expo
Abstract: The alignment of optical fibers is a ubiquitous problem in packaging of opto-electro-mechanical devices and fiber optic connectors. We introduce three alignment algorithms based on the understanding that power transmission loss of Gaussian beam increases parabolically with respect to the geometrical misalignment. The first two methods "Gradient Based" and "Circular Scanning" are relatively simple but generally require many measurements during alignment. A new method, "Kinematic Parameter Identification", uses kinematic parameters to represent geometric misalignments, and it defines the absolute position and orientation of the fiber. These parameters are then identified by applying the least square methods on power loss data using a smaller number of measurements. As an application, an automatic fiber insertion to a connector ferrule was successfully implemented using fiber to fiber alignment algorithms described in this paper.
Key words: fiber, alignment, Gaussian beam, search, optical power loss.