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Investigation of monolithic passively mode-locked quantum dot lasers with extremely low repetition frequency.

Xu T, Cao J, Montrosset I - Nanoscale Res Lett (2015)

Bottom Line: A modified multisection delayed differential equation model is proposed to accomplish simulations of both two-section and three-section passively mode-locked lasers with long cavity.According to the numerical simulations, it is shown that fundamental and harmonic mode-locking regimes can be multistable over a wide current range.In addition, we demonstrate that fundamental pulses with higher peak power can be achieved when the laser is designed to work in a region with smaller differential gain.

View Article: PubMed Central - PubMed

Affiliation: Key Laboratory of Terahertz Solid-State Technology, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai, 200050 China.

ABSTRACT
The dynamical regimes and performance optimization of quantum dot monolithic passively mode-locked lasers with extremely low repetition rate are investigated using the numerical method. A modified multisection delayed differential equation model is proposed to accomplish simulations of both two-section and three-section passively mode-locked lasers with long cavity. According to the numerical simulations, it is shown that fundamental and harmonic mode-locking regimes can be multistable over a wide current range. These dynamic regimes are studied, and the reasons for their existence are explained. In addition, we demonstrate that fundamental pulses with higher peak power can be achieved when the laser is designed to work in a region with smaller differential gain.

No MeSH data available.


Schematic diagram of the considered two-section (a) and three-section (b) passively ML FP lasers in this paper.
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Fig1: Schematic diagram of the considered two-section (a) and three-section (b) passively ML FP lasers in this paper.

Mentions: Unless otherwise specified, in this paper, we considered a monolithic two-section QD ML laser (as shown in Figure 1a) with active region consisting of fivefold stack of self-assembled InAs QD layers and with a saturable absorber (SA) length LSA of 2 mm, gain section length Lg of 18 mm (the corresponding fundamental repetition frequency is 2.4 GHz), ridge width W of 6 μm, high-reflection coating at the SA side facet with reflectivity R0 = 95%, and the cleaved output facet with reflectivity RL = 33%. Indeed, this monolithic laser, used in our numerical simulation, has the same waveguide structure parameters to those used in the experimental studies in [3].Figure 1


Investigation of monolithic passively mode-locked quantum dot lasers with extremely low repetition frequency.

Xu T, Cao J, Montrosset I - Nanoscale Res Lett (2015)

Schematic diagram of the considered two-section (a) and three-section (b) passively ML FP lasers in this paper.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4384970&req=5

Fig1: Schematic diagram of the considered two-section (a) and three-section (b) passively ML FP lasers in this paper.
Mentions: Unless otherwise specified, in this paper, we considered a monolithic two-section QD ML laser (as shown in Figure 1a) with active region consisting of fivefold stack of self-assembled InAs QD layers and with a saturable absorber (SA) length LSA of 2 mm, gain section length Lg of 18 mm (the corresponding fundamental repetition frequency is 2.4 GHz), ridge width W of 6 μm, high-reflection coating at the SA side facet with reflectivity R0 = 95%, and the cleaved output facet with reflectivity RL = 33%. Indeed, this monolithic laser, used in our numerical simulation, has the same waveguide structure parameters to those used in the experimental studies in [3].Figure 1

Bottom Line: A modified multisection delayed differential equation model is proposed to accomplish simulations of both two-section and three-section passively mode-locked lasers with long cavity.According to the numerical simulations, it is shown that fundamental and harmonic mode-locking regimes can be multistable over a wide current range.In addition, we demonstrate that fundamental pulses with higher peak power can be achieved when the laser is designed to work in a region with smaller differential gain.

View Article: PubMed Central - PubMed

Affiliation: Key Laboratory of Terahertz Solid-State Technology, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai, 200050 China.

ABSTRACT
The dynamical regimes and performance optimization of quantum dot monolithic passively mode-locked lasers with extremely low repetition rate are investigated using the numerical method. A modified multisection delayed differential equation model is proposed to accomplish simulations of both two-section and three-section passively mode-locked lasers with long cavity. According to the numerical simulations, it is shown that fundamental and harmonic mode-locking regimes can be multistable over a wide current range. These dynamic regimes are studied, and the reasons for their existence are explained. In addition, we demonstrate that fundamental pulses with higher peak power can be achieved when the laser is designed to work in a region with smaller differential gain.

No MeSH data available.