| 摘要 |
<p>A single mode optical fiber comprises from center to periphery a core, at least first and second depressed claddings, and an outer cladding. The core has a radius (R co ) comprised between 3.5 µm and 5.5 µm and an index difference with the outer cladding (Dn co -Dn out ) comprised between 0 and 3.10 -3 ; the first depressed cladding has a radius (R cl1 ) comprised between 9 µm and 15 µm and an index difference with the outer cladding (Dn cl1 -Dn out ) comprised between -5.5.10 -3 and -2.5.10 -3 ; the second depressed cladding has a radius (R cl2 ) comprised between 38 µm and 42 µm and an index difference with the first depressed cladding (Dn cl2 -Dn cl1 ) comprised between -0.5.10 -3 and 0.5.10 -3 ; and the outer cladding has a radius comprised between 61,5 µm and 63,5 µm. A fiber with reduced attenuation can be manufactured at reduced cost.</p> |
