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Theoretical Analysis of Single Mode GaInAsP/InP Positive-Index-Guided Laser Array

Jie DONG, Jong-In SHIM, Shigehisa ARAI, Kazuhiro KOMORI

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Summary :

A detailed numerical solution of the design criteria of in-phase lateral and single-longitudinal-mode operation GaInAsP/InP DFB laser arrays is presented. The analysis, including broad-area pumped and stripe-geometry pumped index-guided arrays, was carried out on the basis of the eigenvalue equation method. It is shown that there exists a cut-off array pitch co, at which all of the higher-order array modes are cut off. For the pitch larger than the cut-off pitch co, the modal discrimination is evaluated by the threshold gain difference between the in-phase lateral and higher-order array modes. As a result, the modal discrimination was found to decrease with the increase of the number of elements and the array pitch which is limited to be smaller than twice the cut-off pitch co to attain a stable in-phase lateral- and single-longitudinal-mode operation.

Publication
IEICE TRANSACTIONS on Electronics Vol.E75-C No.12 pp.1529-1535
Publication Date
1992/12/25
Publicized
Online ISSN
DOI
Type of Manuscript
PAPER
Category
Opto-Electronics

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