1. A light waveguide circuit comprising: a planar light waveguide including a core and a cladding; a plurality of landmarks arranged at opposite ends within the planar light waveguide, each landmark spaced apart from each other at a predetermined interval (t) starting at one end of the planar light waveguide; wherein the plurality of said landmarks is operative for selectively cutting one side of the planar light waveguide within a permissible angle error.