FIG. 5 includes FIGS. 5a, 5 b, 5 c; and FIG. 5a is a side view of another embodiment of an optical waveguide having a tapered central section with a blazed Bragg grating written therein in accordance with the present invention; FIG. 5b is a side view of another embodiment of an optical waveguide having a quadratically tapered central section with a blazed Bragg grating written therein in accordanc