Browse Prior Art Database

Multi-Use, Multi-Bandwidth Optical Fiber

IP.com Disclosure Number: IPCOM000038643D
Original Publication Date: 1987-Feb-01
Included in the Prior Art Database: 2005-Jan-31
Document File: 2 page(s) / 63K

Publishing Venue

IBM

Related People

Balliet, L: AUTHOR

Abstract

A technique is described whereby an optical fiber is so designed as to provide multiple use and multiple bandwidth capability. The design is unique in that when the optical fiber is fabricated into an optical fiber cable, the cable will provide the required characteristics needed to function in multiple applications, such as high bandwidth infrared lasers or lower bandwidth light-emitting diodes (LEDs). In the prior art, excluding single mode applications, to obtain the characteristics required for optical transmission, two types of (Image Omitted) optical fiber were required: graded index and step index fiber. Graded index fiber typically is a small diameter fiber, usually having a core of about 50 microns, and provides high bandwidth, such as required in narrow light-emission areas, as used in laser applications.

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Multi-Use, Multi-Bandwidth Optical Fiber

A technique is described whereby an optical fiber is so designed as to provide multiple use and multiple bandwidth capability. The design is unique in that when the optical fiber is fabricated into an optical fiber cable, the cable will provide the required characteristics needed to function in multiple applications, such as high bandwidth infrared lasers or lower bandwidth light-emitting diodes (LEDs). In the prior art, excluding single mode applications, to obtain the characteristics required for optical transmission, two types of

(Image Omitted)

optical fiber were required: graded index and step index fiber. Graded index fiber typically is a small diameter fiber, usually having a core of about 50 microns, and provides high bandwidth, such as required in narrow light-emission areas, as used in laser applications. Graded index fiber produces a parabolic index profile 10, as shown in Fig. 1. Step index fiber, typically of a larger diameter, is most efficiently used in LED applications requiring lower transmission bandwidths and typically produces a step index profile 11. Some fibers are produced which comprise the characteristics of the two types by partially grading the fiber by deviating the index profile from the ideal parabolic shape. However, transmission efficiency and operation are sacrificed in this approach. The technique described herein combines the desirable characteristics of both graded index and step index f...