| 摘要 |
A method of forming an optical waveguide which tapers to a point at each end comprises the steps of:<BR> ```defining a first shape (of a photoresist) (8, Fig. 4A) having first and second parallel sides;<BR> ```defining a second shape (of a photoresist) (7, Fig. 4D) having third and fourth parallel sides orientated such that the third and fourth sides each intersect the first and second sides of the first shape (8) at an acute angle; and<BR> ```using the shape of the area where the first and second shapes overlap to define a mask of SiO<SB>2</SB> (6B, Fig. 4F) which is used to form an optical waveguide (1A, Fig. 4H) with an elongate parallelogram shape. The tapered waveguide (1A) may be formed of active material over and optically coupled with a passive waveguide (2A). |
