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Ch9sec2 - THE FIBER FORUM Fiber Optic Communications...

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THE FIBER FORUM Fiber Optic Communications Dr. JOSEPH C. PALAIS PRESENTED BY
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Dr. Joseph C. Palais I 2 Section 9.2 Directional Couplers
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Dr. Joseph C. Palais 9.2 3 Here we describe the physical construction of several types of directional couplers. The fused biconically-tapered directional coupler Construction: 1. Twist two bare fibers around each other 2. Heat the junction until the glass softens 3. Pull the fiber ends apart, forming a taper in the fused portion of the coupler
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Dr. Joseph C. Palais 9.2 4 Cladding 2 3 1 4 core core Operation A. In a multimode fiber higher-ordered modes are converted to cladding modes in the tapered region. Since the cladding is shared by the two fibers, the energy is also shared.
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Dr. Joseph C. Palais 9.2 5 The output taper converts cladding modes back into core modes.
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Dr. Joseph C. Palais 9.2 6 B. In a single-mode fiber the evanescent fields in the fiber cladding are shared, producing coupling.
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  • Spring '10
  • PALAIS
  • Fiber-optic communication, Multi-mode optical fiber, Single-mode optical fiber, JOSEPH C. PALAIS, Dr. JOSEPH C. PALAIS

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