I. Introduction
There are numerous optical devices which require some form of focusing element to influence the propagation of an optical beam. In particular, a lens which can focus the optical signal onto the waveguide of a planar lightwave circuit may have application in micro-optoelectromechanical (MOEM) switches, alignment of waveguides to fiber optic terminations, and the integration of planar lightwave circuits with photodetector and laser diodes.