A planar wafer-level packaging method is provided for a laser and a microlens.
Light from the laser is directed and shaped by the microlens to couple into an
external light guide. A plurality of such assemblies, each comprising a laser and
a microlens may be assembled on a single planar substrate. A tapered surface is
formed on the microlens. The microlens may be formed from a silicon substrate.
The angle of the tapered surface causes an accurate cone or pyramid shape. The
tapered surface is formed such that the axis of the cone or pyramid is aligned
with the optical axis of the lens. The lens may then be aligned with the optical
axis of the laser. A light guide receptacle is formed with a tapered surface that
matches the tapered surface of the microlens. The tapered surface of the receptacle
is formed such that the axis of the cone or pyramid is aligned with the optical
axis of the receptacle. The receptacle may then be passively aligned with the microlens
by mating the tapered surfaces.