A technique has been developed for fabricating M × N fiber couplers that use different core-size fibers to improve the interconnection efficiency of multiterminal optical fiber systems. Experimental results are described for a 2 × 8 transmissive asymmetrical star coupler using 125-µm core diam input fibers and 63-µm core diam output fibers. This construction procedure also has the important advantage of improving the fiber throughput uniformity of fused biconical taper multiport couplers.
© 1981 Optical Society of America
R. L. Gravel and A. R. Nelson, "Asymmetrical star coupler for optical fiber systems," Appl. Opt. 20, 2735-2737 (1981)