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

Jie DONG  Jong-In SHIM  Shigehisa ARAI  Kazuhiro KOMORI  

IEICE TRANSACTIONS on Electronics   Vol.E75-C   No.12   pp.1529-1535
Publication Date: 1992/12/25
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Opto-Electronics
DFB laser array,  in-phase,  modal discrimination,  single-logitudinal-mode,  

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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.