Dual/Multi-Channel Graded Index Lens Fiber-Optics Coupling
Original Publication Date: 1984-Nov-01
Included in the Prior Art Database: 2005-Feb-05
This article describes an arrangement which makes a single fiber multi-drop bus system feasible by efficiently coupling light energy into a fiber while simultaneously tapping receiver energy from the fiber. It solves the problem of dual-wave length/multi-channel coupling to and from a single fiber. Figs. 1A, 1B, 1C and 1D show the basic coupling mechanism for three types of devices. The coupling mechanism uses quarter pitch graded index lenses of normal construction to collimate light from a communication fiber 15. Referring to Fig. 1A, a graded index lens 1 is cut at nominally quarter pitch with a prism mounted at the end with a 45-degree polished facet 2 that reflects light. The facet 2 is formed by a combination of etching, grinding and polishing.