Investigation of longitudinal spatial-hole burning in high-order laterally coupled distributed feedback lasers

Akram Akrout; Kais Dridi; Trevor J. Hall

doi:10.1117/12.2001395

24 October 2012 Investigation of longitudinal spatial-hole burning in high-order laterally coupled distributed feedback lasers

Akram Akrout, Kais Dridi, Trevor J. Hall

Author Affiliations +

Proceedings Volume 8412, Photonics North 2012; 841219 (2012) https://doi.org/10.1117/12.2001395
Event: Photonics North 2012, 2012, Montréal, Canada

Abstract

In this work, we numerically study the effect of high-orderλ /4 phase-shift grating in laterally-coupled distributed feedback (LC-DFB) lasers performance. It is well known that single-mode operation is improved by introducing λ/4 phase-shift grating in conventional DFB lasers. However, introducing λ/4 phase-shift region increases the optical intensity around this region and results in strong longitudinal spatial-hole burning (LSHB). To flatten the longitudinal carrier density distribution, we have numerically studied the effect of the radiation modes on high-order LC-DFB lasers using a modified time-domain travelling-wave algorithm. It is shown that, the degree of LSHB can be effectively reduced when considering high-order LC-DFB lasers with grating duty-cycle tailored to optimal values. LC-DFB laser cavity with high-order grating shows a strong non-uniformity of the carrier density distribution. However, as we finely engineer grating features, LSHB is highly reduced and high single mode suppression ration can be achieved.

Citation Download Citation

Akram Akrout, Kais Dridi, and Trevor J. Hall "Investigation of longitudinal spatial-hole burning in high-order laterally coupled distributed feedback lasers", Proc. SPIE 8412, Photonics North 2012, 841219 (24 October 2012); https://doi.org/10.1117/12.2001395

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