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As a result of the rapidly growing volume of data transfer in telecommunication networks, data streams for digital video, high-definition television (HDTV), and color graphics are requiring higher and higher bandwidth. It leads people to consider the optical communication to be a good solution for today’s digital life networks. In spite of the importance in wide band communication, the assembly procedures of the optical communication system, especially for the triplexers, are still so complicated as to be costly. This thesis adopts two ideas in the improvement of the assembly of the triplexer. One of them is the usage of multi-mode optical fibers in constraining the optical beams to travel in the desired paths. Then the well conducted optical beams are coupled with each others in self-alignment V-groove platforms which could immunize the fiber coupling from lateral misalignment, angular misalignmnet, and even the separation between fiber ends. Here the usage of the V-groove platform is the other contribution of this work and it is proved to be helpful not only in the simplification of the assembly but also in the enhancement of the couple efficiency. To raise the optical coupling efficiency further, ASAPTM and Beam-PROPTM software are also employed in this work. They are used in the calculation of the optimum gap between two optical elements. The measurement shows that the total optical coupling efficiency of the implemented optical system is 9.3 ﹪(-10.3 dB) which is in compliance with IEEE 802.3z standard.
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