Abstract
The key component for any fiber data bus system is the fiber coupler. Since multimode single-strand fiber is used as a communication link in a data bus system, multimode fiber couplers must be designed and used. The simultaneous presence of many modes in multimode fibers renders the powerful coupled node theory which is based on the concept of phase matching among single modes, useless in predicting the coupling length of the multimode fiber coupler. Because of the close proximity of the coupling elements, results obtained according to other perturbation techniques are also questionable. In this presentation we shall first mention the available theories and experiments on multimode couplers, then a new technique based on the computer solution of wave equations will be introduced and applied to various realistic multimode couplers made with graded-index fibers. Practical aspects of the problem will be emphasized.
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