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Dual Fiber Optic Source Coupling

IP.com Disclosure Number: IPCOM000052840D
Original Publication Date: 1981-Jul-01
Included in the Prior Art Database: 2005-Feb-11
Document File: 2 page(s) / 60K

Publishing Venue

IBM

Related People

Balliet, L: AUTHOR [+2]

Abstract

There are applications requiring coupling of more than one optical fiber to a single source. The following arrangement couples two or more fibers to a single LED (light emitting diode) at no increase in manufacturing difficulty or cost.

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Dual Fiber Optic Source Coupling

There are applications requiring coupling of more than one optical fiber to a single source. The following arrangement couples two or more fibers to a single LED (light emitting diode) at no increase in manufacturing difficulty or cost.

In edge-emitting LEDs for single fiber coupling, the emission area is typically
.001, .010 in/2/. If more than two fibers are needed, the wider emission pattern is accomplished without significant increase in current density at the LED or in cost.

Fig. 1 shows the typical emission pattern 10 of an edge-emitting LED 12. Because of the shape of the emission pattern, alignment in the lateral direction is not critical. Fig. 2 illustrates the concept of the dual butting of the fibers 13 and 14 to the rectangular emission area 11. Approximately equal amounts of light are coupled to each fiber. Thus, dual signals are obtained with the same energy input at the LED. Three fibers can also be coupled using the same arrangement, but the LED has to be made wider.

A precision micro positioner (not shown) is used to align the LED with the fibers, as can be seen in Fig. 3. The LED is placed on a standard header 15, and the fibers are placed on a separate holder 16. Alignment is made while observing the light output of one or both fibers.

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