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5 February 1990 Optical Fiber Couplers
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Both strength and insertion loss of fused couplers are improved by controlling the fusion time and initial thickness of partially etched optical fiber cladding. Coupled power is controlled precisely by the fusion time, prefusion condition before melting, effective coupling length and effective pressure between the fibers. Typical average losses are - 0.48 and 1.45 dB, made of 50/125 μm; - 0.6 and 1.70 dB made of 6/125 μm fibers for 2 x 2 and 4 x 4 couplers, respectively. The strength becomes maximum for a fusion time of 3.0 s. Similar losses and strength are obtained for twin-core optical fiber couplers fused for 3 s. A mathematical model has been developed to analyze the experimental data. Also included is an empirical relation fitting the coupled power vs. core-to-core spacing data of the fiber couplers measured at 850 and 1300 nm.
© (1990) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
A. K. Das and B. Rakshit "Optical Fiber Couplers", Proc. SPIE 1176, Components for Fiber Optic Applications IV, (5 February 1990);


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