| 摘要 |
In a preferred embodiment of the present invention there is provided a substrate having formed therein a plurality of optical waveguides. The waveguides are formed in a fanned out pattern with each alternate waveguide having a different width. At the fanned out ends of each of the waveguides there is coupled an optical fiber for transmitting light to the optical waveguide. In another embodiment of the invention, a substrate block is formed of glass, plastic, or X-cut LiNbO3 material and each waveguide in LiNbO3 is formed by diffusing strips of Ti or other suitable optical waveguide material into the substrate in a desired fan pattern and by forming an overcoat with a material, such as MgO for LiNbO3, which has an index of refraction that causes the output beam to be symmetrically formed. In yet another embodiment of the invention each of the optical waveguides is formed with a narrow width portion and a wide width portion with the narrow width portions of each of the waveguides being adjacent the wide width portions of a neighboring waveguide.
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