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Fused taper infrared optical fiber couplers in chalcogenide glass

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4 Author(s)
Schaafsma, D.T. ; US Naval Res. Lab., Washington, DC, USA ; Moon, J.A. ; Sanghera, J.S. ; Aggarwal, I.D.

We have fabricated low loss, high coupling ratio bidirectional optical couplers for infrared light using multimode step-index chalcogenide fiber. Using a fusion technique similar to that commonly employed with silica fibers, we have found a temperature regime where fusion can occur while interdiffusion of the core and cladding materials will not. The resultant device has a roughly 3:1 coupling ratio, less than 0.3 dB of excess insertion loss, and preserves the guided modes of the fiber intact

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Lightwave Technology, Journal of  (Volume:15 ,  Issue: 12 )