National Changhua University of Education Institutional Repository : Item 987654321/11920

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NCUEIR > College of Engineering > Department and Graduate Institute of Electronic Engineering > Periodical Articles > Item 987654321/11920

Please use this identifier to cite or link to this item: http://ir.ncue.edu.tw/ir/handle/987654321/11920

Title:	Coupling efficiency of surface-emitter LED’s to single-mode fibers
Authors:	Chen, Kuo-Liang;Kerps, Dieter
Contributors:	電機工程系
Date:	1987-11
Issue Date:	2012-07-03T01:35:14Z
Publisher:	Institute of Electrical and Electronics Engineers Inc.
Abstract:	Using coherent-mode representation, the light emission of a surface-emitting LED (SELED) with a Lambertian far-field and a uniform near-field intensity is expressed by coherent modes. The coupling efficiency of the SELED to a single-mode fiber is calculated as the weighted sum of the coupling efficiencies of the coherent modes to the fiber mode. The absolute maximum achievable efficiency is found to be the inverse of the number of the coherent modes, and is equal to ( lambda λ²/ pi A), where A is the LED emission area and lambda is the emission wavelength. This efficiency can be obtained by butt coupling if the LED area A is about equal to or larger than the fiber mode size. The theoretical prediction agrees well with published experimental data.
Relation:	Journal of Lightwave Technology, 5(11): 1600-1604
Appears in Collections:	[Department and Graduate Institute of Electronic Engineering] Periodical Articles

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