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Abstract : This report is the final report on a one-year technology development program for fiber optic coupler components. The devices investigated and developed were three port couplers, directionals and 'T' couplers, and reflective and transmissive star couplers with 7, 19 and 32 ports or port pairs respectively. These coupler components were fabricated by direct fusion of plastic clad silica (PCS) fiber cores. Power division or distribution in these couplers is proportional to the ratio of the area of any port to that of the total coupler cross-sectional area, termed area ratio splitting.