Additional modal selectivity induced by a localized defect in quarter-wave-shifted DFB lasers

被引：6

作者：

Fessant, T ^{[1
]}

Boucher, Y ^{[1
]}

机构：

[1] Ecole Natl Ingn Brest, Lab RESO, Technopole Brest Iroise, F-29608 Brest, France

来源：

IEEE JOURNAL OF QUANTUM ELECTRONICS | 1998年 / 34卷 / 04期

关键词：

coupled-mode analysis; distributed feedback laser; localized impurity; modal overlap; scattering center; semiconductor laser;

D O I：

10.1109/3.663433

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

The effects of a localized impurity upon the threshold spectral properties of quarter-wave-shifted distributed feedback (QWS-DFB) lasers are analyzed. The singularity, which can exhibit absorbing, dephasing, as well as reflecting properties, is mathematically described by a transfer matrix so that its inclusion in the usual matrix formalism of coupled-wave equations is easy, The exact location of the singularity, its strength, as well as the grating phase with respect to the origin are found to affect greatly the modal behavior of the structure. The localized defect interacts differently with each mode due to their intracavity stationary field pattern, so that a modally selective center is produced. A correct optimization of the singularity parameters thus enables an enhancement of the laser performance.

引用

页码：602 / 608

页数：7

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