Patent ID: 7336881

Claim:
A method of fabricating a planar lightwave circuit (PLC) having a changed optical waveguide, the method comprising the steps of: (b) forming an initial optical waveguide having a predetermined pattern on a substrate; and (c) reflowing the optical waveguide by applying heat thereto, wherein the initial optical waveguide in the step (b) has a width d(x) and a height T c along a lengthwise direction, wherein the changed optical waveguide after the step (c) has a radius R(x) along the lengthwise direction, and wherein the initial optical waveguide and the changed optical waveguide have a following correlation: R ⁡ ( x ) 2 ⁢ ( π - cos - 1 ( R ⁡ ( x ) 2 - d ⁡ ( x ) 2 4 R ⁡ ( x ) ) ) + d ⁡ ( x ) ⁢ R ⁡ ( x ) 2 - d ⁡ ( x ) 2 4 2 - d ⁢ ( x ) ⁢ T c = 0.