G - Physics – 02 – B
Patent
G - Physics
02
B
G02B 6/02 (2006.01) C03B 37/012 (2006.01) C03B 37/018 (2006.01) C03B 37/027 (2006.01)
Patent
CA 2323351
Our method of making high bandwidth silica-based multimode optical fiber comprises provision of a non-circular preform, and drawing fiber of chiral structure from the preform. The non-circular preform can be made by maintaining the inside of the tubular preform under reduced pressure during at least part of the collapse, resulting in a non-circular core and cladding. It can also be made by removal (e.g., by grinding or plasma etching) of appropriate portions of the preform, resulting in a circular core and non-circular cladding. In the latter case, fiber is drawn at a relatively high temperature such that, due to surface tension, the cladding assumes substantially circular shape and the core assumes a non-circular shape. The chiral structure is imposed on the fiber in any appropriate way, e.g., by twisting during fiber drawing the fiber alternately in clockwise and couterclockwise sense relative to the preform.
Digiovanni David John
Golowich Steven Eugene
Jones Sean L.
Reed William Alfred
Kirby Eades Gale Baker
Lucent Technologies Inc.
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