| 摘要 |
The invention lies in the field of integrated optics and communications technology. Here, integrated compact beam splitters and combiners are highly important. These optical functions can be fulfilled by "multi-mode interference (MMI)" couplers. With these couplers a certain number of inputs is uniformly distributed over all outputs. These components have wide manufacturing tolerances and are in a good approximation, polarisationindependent. In conventional MMI couplers with parallel flanks the intensity and phase distributions at the output are fixed. For many applications, however, it is necessary to be able to influence these distributions in a controlled manner. The invention proposes a process for the controlled alteration of the intensity and phase ratios at the output of MMI couplers. For this purpose, the conventional MMI couplers are first divided into sections. Each section is then separately transformed so that the self-imaging properties are retained. At the end the sections are once again arranged in series. Judicious selection of the transformations makes it possible to obtain differently controlled beam splitters and combiners. The ratios are changed by a simple tolerant control of geometrical parameters.
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